The present invention relates to a working machine such as a backhoe.
A working machine disclosed in Japanese Patent Publication No. 4608088 is commonly known.
In the working machine disclosed in Japanese Patent Publication No. 4608088, a cabin is mounted on a machine body and a front support bracket is provided to protrude forward from the machine body. A swing bracket is pivotally supported by the support bracket swingably in a horizontal direction. A boom is pivotally supported by the swing bracket swingably in a vertical direction.
A working machine according to one aspect of the present invention includes a machine body, a support bracket protruding forward from the machine body, a swing bracket pivotally supported by the support bracket to be capable of horizontally pivoting, a boom pivotally supported by the swing bracket to be capable of pivoting up and down, a swing sensor to detect a position of the swing bracket, and a controller to acquire a detection signal from the swing sensor and to control a swinging movement defined as the pivotal movement of the swing bracket. The controller includes a swinging stopper unit configured to stop the swinging movement when the swing bracket in the pivotal movement reaches a center position at which the boom is orientated in a forward direction of the machine body.
The swinging stopper unit releases the stop of the swinging movement after passage of a predetermined time from the stop of the swinging movement.
The working machine includes a stopping release switch connected to the controller. The controller includes a stopping-function release unit configured so that, according to operation of the stopping release switch, the stopping-function release unit prevents the swinging stopper unit from stopping the swinging movement when the stopping release switch is operated.
The working machine includes an operator section including an operator seat and an operation device mounted on the machine body, and a detection sensor to detect a position of the boom with respect to the operator section. The controller includes a boom stopper unit configured to acquire a signal from the detection sensor and to stop the boom before reaching a position where the boom comes to interfere with the operator section.
The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.
A more complete appreciation of preferred embodiments of the present invention and many of the attendant advantages thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings described below.
Preferred embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings. The drawings are to be viewed in an orientation in which the reference numerals are viewed correctly.
Hereinafter, an embodiment of the present invention will be described with appropriate reference to the drawings.
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In the description of this embodiment, a front side of an operator seated on the driver seat 6 of the working machine 1 (a direction of an arrowed line A1 in
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A dozer 7 is attached to a front portion of the traveling device 3. The dozer 7 is configured to extend and retract a dozer cylinder (hydraulic actuator) to perform the lifting and lowering (the lifting and lowering of a blade).
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The prime mover E1 is located closer to the other side portion (right portion) in the machine width direction K2 than on the center line Y1. The prime mover E1 is a diesel engine. The prime mover E1 may be a gasoline engine, an LPG engine, or an electric motor, or may be a hybrid type including an engine and an electric motor.
A hydraulic pump P1 is installed at the rear portion of the prime mover E1. The hydraulic pump P1 is driven by the power of the prime mover E1 to pressurize and output a hydraulic fluid that is to be used in a hydraulic driving portion. The hydraulic driving portion is, for example, a hydraulic actuator provided on the working machine 1. In front of the prime mover E1, a radiator R1, an oil cooler O1, and a condenser D1 are arranged and mounted on the machine body 2. The radiator R1 is a cooling device that cools cooling water of the prime mover E1, and the oil cooler O1 is a cooling device that cools operation fluid. The condenser D1 is a cooling device (condenser) that cools refrigerant of an air conditioning system (air conditioner) provided on the working machine 1.
A cooling fan F1 is installed between the radiator R1 and the prime mover E1 to generate an cooling air for cooling the prime mover E1. The cooling fan F1 is driven by the power of the prime mover E1 to generate the cooling air flowing from the front to the rear.
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A weight 10 is provided at a rear portion of the machine body 2. The weight 10 is located on the rear portion of the machine body 2, and is attached at a lower portion thereof to the swiveling base plate 9. The weight 10 protrudes upward from the swiveling base plate 9. Furthermore, the weight 10 is located rearward from the cabin 5 and the driver seat 6.
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The weight 10 is located rearward from the fuel tank T1 and the operation fluid tank T2. The fuel tank T1 and the operation fluid tank T2 are arranged within a width of the weight 10 in the machine width direction K2 to face a front surface of the weight 10. The fuel tank T1 is positioned on one side (left side) with respect to the operation fluid tank T2 in the machine width direction K2, and the operation fluid tank T2 is positioned on the other side (right side) with respect to the fuel tank T1 in the machine width direction K2.
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A side face of at least one rear-mounted member located behind the cabin 5 is defined as the first face 47. The side face of the rear-mounted member is located behind the lower portion of the cabin 5 and faces in the machine outward direction. In the embodiment, a first cover 18A and the weight 10 serve as the at least one rear-mounted member. The first cover 18A covers the fuel tank T1, and is located between the weight 10 and the operator section 42. The first cover 18A includes an upper wall portion 50 covering an upper side of the fuel tank T1 and a side wall portion 51 covering the left side of the fuel tank T1. A side face of the rear-mounted member, that is, the first face 47, is formed of a side surface of the first cover 18A (i.e., an outer side surface of the side wall portion 51) and a left side surface 10a of the weight 10. The first face 47 is located closer to the center of the machine body 2 in the width direction than the center of the cabin 5 in the machine width direction K2. The first face 47 is not limited to the configuration formed of the side surface of the first cover 18A and the side surface 10a of the weight 10, but may be formed of the side wall of the fuel tank (rear-mounted member) T1, for example.
A rear surface of the cabin 5 is defined as the second face 48.
The step 49 is provided at a lower end portion of the cabin 5, and defines the lower face of the space 46. That is, the space above the step (floor surface) 49 is the space 46. The step 49 is a member that defines the upper surface of the machine body 2 on which an operator steps. The fuel tank T1 is located in the vicinity of the step 49.
As described above, the space 46 is defined by the first face 47, the second face 48, and the step 49 so as to extend upward from the lower end portion of the cabin 5 and to be open upward. The space 46 is also open leftward (in the machine outward direction) and rearward.
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The rear window 52 is configured to be opened and closed. As shown in
The step 49 is located on the side of the fuel tank T1. As shown in
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The steps 49 can be opened and closed, and when the steps 49 is opened, the fueling device 57, the fuel pump 59, the sedimenter 58, and the like can be easily accessed.
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The control valve V1 is a composite control valve unit (hydraulic device) of a sectional type with a plurality of control valves (valves) coupled to and stacked on one another in the vertical direction (see
The control valves constituting the control valve V1 are control valves configured to control hydraulic actuators such as hydraulic cylinders and hydraulic motors provided on the working machine 1. Each of the control valves constituting the control valve V1 is configured as a valve, e.g., a pilot-operated solenoid valve, electrically controlled by a later-discussed controller U1. The pilot-operated solenoid valve includes a solenoid and a main spool and is configured so that the solenoid is controlled to control the motion of the main spool so as to control a pilot pressure for controlling the flow of hydraulic fluid. For example, the valves serving as the control valves constituting the control valve V1 are configured to control a first traveling motor M1, a second traveling motor M2, a swivel motor M3, a dozer cylinder, a swing cylinder C2, a boom cylinder C3, an arm cylinder C4, a working tool cylinder C5 for operating a later-discussed working tool 24, respectively. One of the control valves may be configured as an auxiliary control valve for controlling a hydraulic actuator of the working tool 24. In particular, when a kind of working tool 24 including a hydraulic actuator is attached to the working machine 1, the control valve unit configured to as the auxiliary control valve is used to control the hydraulic actuator of the working tool 24.
The operation fluid tank T2 is located rearward from the control valve V1. A hydraulic pump P1 is located rightward from a front half portion of the operation fluid tank T2.
A zone in which hydraulic devices including the swivel motor M3, the swivel joint S1, the control valve V1, the operation fluid tank T2 and the hydraulic pump P1 are arranged to continue from the swivel motor M3 to the hydraulic pump P1 is defined as a hydraulic device arrangement section 13 where the hydraulic devices are arranged. In other words, the hydraulic device arrangement section 13 for arrangement of the hydraulic devices is provided between the cabin 5 and the prime mover E1, and the hydraulic devices arranged in the hydraulic device arrangement section 13 includes the swivel joint S1, the swivel motor M3, and the control valve V1. The hydraulic device arrangement section 13 includes a first arrangement portion (arrangement portion) 13A where the swivel joint S1, the swivel motor M3, and the control valve V1 are arranged, and a second arrangement portion 13B where the operation fluid tank T2 and the hydraulic pump P1 are arranged (see
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Each of the swivel joint S1, the swivel motor M3, and the control valve V1 are partially or fully offset from the cabin 5 in the machine width direction K2. This allows access to each of the above-mentioned devices in the maintenance and the like without unloading the cabin 5.
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The first cover body 15 is located at the front right portion of the machine body 2, and covers the radiator R1, the oil cooler O1, and the condenser D1. An outside air intake 19 for introducing the outside air to the inside of the first cover body 15 is provided in a side surface of a front portion of the first cover body 15. The cooling fan F1 sucks the outside air introduced from the outside air intake 19.
The second cover body 16 is located behind the first cover body 15, and covers the prime mover E1. That is, the second cover body 16 is a hood defining a prime mover room (engine room) ER for housing the prime mover E1 (hereinafter referred to as a hood).
A third cover 17 is located between the first and second cover bodies 15 and 16 and the cabin 5 (driver seat 6) to cover the device arrangement section 13. In the embodiment, the third cover 17 covers the first arrangement portion 13A defined as a portion of the device arrangement section 13 between the prime mover E1 and the cabin 5. That is, the third cover body 17 covers the swivel joint S1, the swivel motor M3, and the control valve V1.
The fourth cover body 18 is located on the rear portion of the swiveling base plate 9, and covers the fuel tank T1, the operation fluid tank T2, and the like. The fourth cover body 18 includes a first cover 18A, a second cover 18B, and a third cover 18C. The first cover 18A covers the upper and left portions of the fuel tank T1 (see
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The arm 23 is pivotally supported on a tip portion of the boom 22 with an arm pivot shaft 23A. In detail, the arm 23 is pivotally attached to the boom 22 so as to be pivotable around the axis defined as the lateral axis in the state where the boom is orientated forward of the machine body. In this manner, the arm 23 is pivotable in the fore-and-aft direction K1 or in the vertical direction. In other words, the arm 23 can pivot in the direction approaching the boom 23 (crowding direction) and in the direction separating from the boom 23 (dumping direction).
In this embodiment, a bucket serving as a standard attachment to be attached to the working device 4 is exemplified as the working tool 24. Hereafter, the working tool 24 may be referred to as a bucket.
The working tool 24 is pivotally supported on the tip end portion of the arm 23 with the working tool pivot shaft 24A. In detail, the working tool 24 is pivotably attached to the arm 23 to be capable of swinging around the axis defined as the lateral axis in the state where the boom 22 oriented to the forward direction of the machine body. In this manner, the working tool 24 is pivotable in the direction approaching the arm 23 (crowding direction) and in the direction separating from the arm 23 (dumping direction). In other words, the bucket 24 is provided on the arm 23 to be capable of performing a scooping motion and a dumping motion. The scooping motion is a pivotal movement of the bucket 24 in the direction toward the boom 22 for scooping up earth and sand, for example. The dumping motion is a pivotal movement of the bucket 24 away from the boom 22 for dropping (discharging) the scooped earth and sand, for example.
Multiple types of buckets 24 with different lateral widths (widths in the machine width direction K2) are available, and any one of the buckets 24 can be selectively mounted. In place of the bucket 24, any one of working tools (attachments) such as a pallet fork and a mania fork, or any one of working tools with hydraulic actuators (i.e., hydraulic attachments) such as a hydraulic crusher, an angle broom, an earth auger, a snow blower, a sweeper, a mower and a hydraulic breaker can be attached.
The swing bracket 21 is capable of being pivoted by the extending and retracting of the swing cylinder C2 provided in the machine body 2. The boom 22 is capable of being pivoted by the extending and retracting of the boom cylinder C3. The arm 23 is capable of being pivoted by the extending and retracting of the arm cylinder C4. The working tool 24 is capable of being pivoted by the extending and retracting of the working tool cylinder (bucket cylinder) C5. The swing cylinder C2, the boom cylinder C3, the arm cylinder C4, and the working tool cylinder C5 are constituted of hydraulic cylinders (hydraulic actuators).
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When the boom 22 is raised at its uppermost pivotal movement position and the arm 23 is swung in the direction moving the bucket 24 toward the boom 22 while keeping the bucket 24 in the scooping motion, a substantially whole of the bucket 24 is positioned rearward (in a direction A2) from the front end of the dozer 7, and a part of the bucket 24 is positioned rearward from a front end of the swing bracket 21.
In this manner, the arm 23 and the bucket 24 can be brought closer to the machine body 2 so as to locate a part of the bucket 24 rearward from the front end of the swing bracket 21 when the boom 22 is at the uppermost position. Accordingly the working device 4 can be turned in a small radius with the machine body 2 in the swivel motion, thereby stabilizing the motion of the working device 4 for loading earth and sand on the loading tray of a dump truck, or suspending a load from a hook provided at the tip end of the arm 23, for example. In addition, since the bucket 24 can be positioned at a high position close to the machine body 2 when the boom 22 is at the uppermost position, the working machine 1, when loading earth, sand, or the like onto a load carrying platform of a dump truck, can be positioned with the machine body 2 close to the load carrying platform, thereby improving workability. In addition, when the arm 23 is pivoted to separate away from the boom 22 from the state shown by solid lines in
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The boom sensor 263A is attached to the swing bracket 21. The boom sensor 263A is also interlockingly connected to the boom 22 via a second linkage 264. Accordingly, the boom sensor 263A detects a turn angle of the boom 22 around the boom pivot shaft 27. That is, the boom sensor 263A detects a position of the boom 22 with respect to the swing bracket 21.
The arm sensor 263B is attached to the boom 22. The arm sensor 263B is also interlockingly connected to the arm 23 via a third linkage 265. Accordingly, the arm sensor 263B detects a turn angle of the arm 23 around the arm pivot shaft 23A. That is, the arm sensor 263B detects a position of the arm 23 with respect to the boom 22.
The working tool sensor 263C is attached to the arm 23. The working tool sensor 263C is interlockingly connected to the working tool 24 via a fourth linkage 266. Accordingly, the working tool sensor 263C detects a turn angle of the working tool 24 around the working tool pivot shaft 24A. That is, the working tool sensor 263C detects a position of the working tool 24 with respect to the arm 23.
The working device sensor 263 detects a status (posture) of the working device 4 when the boom sensor 263A detects a position of the boom 22, the arm sensor 263B detects a position of the arm 23, and the working tool sensor 263C detects a position of the working tool 24.
The controller U1 is constituted of a microcomputer including a CPU (Central Processing Unit) and EEPROM (Electrically Erasable Programmable Read-Only Memory), for example.
The swing control valve 268, the boom control valve 269, the arm control valve 270, and the working tool control valve 271 are the control valves constituting the control valve V1, and are constituted of the pilot-type solenoid valves described above. The swing control valve 268 controls the swing cylinder C2, the boom control valve 269 controls the boom cylinder C3, the arm control valve 270 controls the arm cylinder C4, and the working tool control valve 271 controls the working tool cylinder C5.
In particular, the swing control valve 268 can be switched from a neutral position 268 to a first position 268B or a second position 268C by selectively exciting or unexciting a first solenoid 268D and a second solenoid 268E. When the swing control valve 268 is switched to the first position 268B, the swing cylinder C2 is extended so that the swing bracket 21 pivots to the right. When the swing control valve 268 is switched to the second position 268C, the swing cylinder C2 is retracted so that the swing bracket 21 pivots to the left.
The boom control valve 269 can be switched from a neutral position 269A to a first position 269B or a second position 269C by exciting or unexciting a first solenoid 269D and a second solenoid 269E. When the boom control valve 269 is switched to the first position 269B, the boom cylinder C3 is extended so that the boom 22 pivots upward. When the boom control valve 269 is switched to the second position 269C, the boom cylinder C3 is retracted so that the boom 22 pivots downward.
The arm control valve 270 can be switched from a neutral position 270A to a first position 270B or a second position 270C by exciting or unexciting a first solenoid 270D and a second solenoid 270E. When the arm control valve 270 is switched to the first position 270B, the arm cylinder C4 is extended so that the arm 23 pivots in a direction approaching the boom 22. When the arm control valve 270 is switched to the second position 270C, the arm cylinder C4 is retracted so that the arm 23 swings in a direction separating away from the boom 22.
The working tool control valve 271 can be switched from a neutral position 271A to a first position 271B or a second position 271C by exciting or unexciting a first solenoid 271D and a second solenoid 271E. When the working tool control valve 271 is switched to the first position 271B, the working tool cylinder C5 is extended so that the working tool 24 pivots in a direction approaching the arm 23. When the working tool control valve 271 is switched to the second position 271C, the working tool cylinder C5 is retracted so that the working tool 24 pivots in a direction separating away from the arm 23.
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In this manner, the controller U1 knows (monitors) the position of the swing bracket 21 with respect to the support bracket 20, the position of the boom 22 with respect to the swing bracket 21, the position of the arm 23 with respect to the boom 22, the position of the working tool 24 with respect to the arm 23, and the state of the working device 4. The controller U1 also recognizes the position of the boom 22 with respect to the cabin 5 based on the position of the swing bracket 21 with respect to the support bracket 20 and the position of the boom 22 with respect to the swing bracket 21.
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The first manipulation handle 82L is operable to swivel the machine body 2 and to pivot the arm 23, for example. The first manipulation handle 82L includes a sensor (position sensor) 82A configured to detect an operational direction and an operation amount of the first manipulation handle 82L. The sensor 82A is electrically connected to the controller U1. Based on the detection signal from the sensor 82A, the controller U1 controls the arm control valve 270 or a swivel control valve (not shown in the drawings) for controlling the swivel motor M3.
The second manipulation handle 82R is operable to swing the boom 15 and to swing the working tool 24, for example. The second manipulation handle 82R includes a sensor (position sensor) 82B configured to detect an operational direction and an operation amount of the second manipulation handle 82R. The sensor 82B is electrically connected to the controller U1. Based on the detection signal from the sensor 82B, the controller U1 controls the boom control valve 269 or the working tool control valve 271.
For example, when a wide bucket 24 or a large working tool 24 is attached to the working machine 1 and the swing bracket 21 is pivoted to the left, the wide bucket 24 or the large working tool 24 may interfere with the cabin 5 (operator section 42).
Accordingly, the working machine 1 includes a swing interference prevention function to stop the movement of the swing bracket 21 at a position where the working tool 24 is free from interfering with the cabin 5. The swing interference prevention function will be described below.
The controller U1 includes a memory unit 276, a pivoting stopper unit 277, and a memory release unit 284. A regulator switch 281 is electrically connected to the controller U1. The regulator switch 281 is provided on the manipulator console 81, for example. The regulator switch 281 may be a physically-operated hardware switch such as a pushbutton switch or a rotary switch, or a software switch that uses software to switch between on and off. The software switch is displayed, for example, on a display unit 84A of a monitor 84 (see
The memory portion 276 stores a predetermined position of the swing bracket 21 when the regulator switch 281 is turned on. In detail, by operating the swing operation tool 267, the swing bracket 21 is pivoted, and then stopped at an arbitrary regulation position (selected as a position for automatically stopping the swing bracket 21). In this state, when the regulator switch 281 is turned on, the memory unit 276 stores the regulation position.
When the swing bracket 21 in the pivotal movement reaches the regulation position corresponding to that stored in the memory unit 276, the pivoting stopper unit 277 outputs a command signal (a signal to return to the neutral position 268A) to the swing control valve 268 to stop the pivotal movement of the swing bracket 21. Due to the command signal, the swing bracket 21 is stopped at the regulation position. Therefore, even when the swing bracket 21 is pivoted by operating the swing operation tool 267, the swing bracket 21 can be automatically and forcibly stopped at the prescribed regulation position to prevent the working tool 24 from interfering with the cabin 5.
The memory unit 276 stores the regulation position of the swing bracket 21 defined when the working device 4 is in a predetermined state (predetermined posture). For example, while the working device 4 is set in the predetermined state, the swing bracket 21 is pivoted leftward from the forward direction of the machine body, and the pivotal movement of the swing bracket 21 is stopped at an arbitrary position before the working tool 24 abuts against the cabin 5. Then, the arbitrary position is stored in the memory unit 276, thereby preventing the working device 4 from interfering with the cabin 5 (operator section 42) and the like.
The predetermined state of the working device 4 is, for example, the state in which the boom 22 is set at the uppermost pivotal movement position, the arm 23 is set at a pivotal movement position closest to the boom 22, and the working tool 24 is set at a pivotal movement position closest to the arm 23. In this state, it is effective to memorize the regulation position of the swing bracket 21 because the working tool 24 in this state is likely to interfere with the cabin.
As described above, in using any one of various types of working tools 24, the position of the swing bracket 21 before the working tool 24 interferes with the cabin 5 is stored, and a swing movement defined as the pivotal movement of the swing bracket 21 is stopped when the swing bracket 21 reaches a position corresponding to the stored position, in this manner, the operator can perform the swing operation without paying attention to the interference between the working tool 24 and the cabin 5.
The memory release unit 284 releases the memory of the regulation position stored in the memory portion 276. In detail, by turning off the regulator switch 281, the memory release unit 284 releases the memory of the regulation position stored in the memory portion 276. In this manner, when the working tool 24 is replaced with another working tool 24, for example, the stop position of the swing bracket 21 can be reset according to a size of the replacement working tool 24.
The release of the memory of the regulated position by the memory release portion 284 may be performed by a regulation release switch different from the regulator switch 281.
The setting of the regulation position may be performed when the swing bracket 21 pivoted from the center position, where the boom 22 is oriented to in the forward direction of the machine body, reaches a position closer to the operator section 42 than the center position.
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In consideration of the problem, the working machine 1 includes a boom interference prevention function to prevent the boom 22 from interfering with the cabin 5 (operator section 42). The boom interference prevention function will be described.
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The boom stopper unit 278 outputs, to the boom control valve 269, a command signal (a signal to return to the neutral position 269A) to stop the boom 22 before the boom 22 interferes with the cabin 5 (operator section 42) (when the boom 22 is close to the cabin 5) based on the position of the boom 22 detected by the position detector unit 283. The boom 22 stops in accordance with this command signal.
In particular, when the boom 22 is pivoted upward after the boom 22 is swung rightward at a predetermined angle or more from the position in the forward direction of the machine body, the boom stopper unit 278 judges, based on the detection result of the position detector unit 283, whether the boom 22 is coming into close proximity to the cabin 5 (operator section 42) or not. When the boom stopper unit 278 determines the boom 278 as being in close proximity to the cabin 5, the operation of raising the boom 22 is stopped so as to prevent the boom 22 from interfering with the cabin 5 (operator section 42).
Based on the position of the boom 22 detected by the position detector unit 283, the pivoting stopper unit 277 outputs a command signal to the swing control valve 268 to stop the swinging movement before the boom 22 interferes with the cabin 5 (operator section 42) (when the boom 22 is close to the cabin 5). The swinging movement is stopped in accordance with the command signal.
In particular, when the boom 22 is swung rightward from the position in the forward direction of the machine body after the boom 22 is raised at a predetermined angle or more, the pivoting stopper unit 277 judges, based on the detection result of the position detector unit 283, whether the boom 22 is coming into close proximity to the cabin 5 (operator section 42). When the pivoting stopper unit 277 determines the boom 22 as being in close proximity to the cabin 5, the swinging movement is stopped so as to prevent the boom 22 from interfering with the cabin 5 (operator section 42).
For example, a case where the boom 22 is moved upward to the uppermost position will now be discussed. Before the upward movement of the boom 22, if the swing bracket 21 is oriented in a leftwardly forward diagonal direction, the swing bracket 21 is swung rightward to be stopped at the center position, and if the swing bracket 21 is oriented in a rightwardly forward diagonal direction, the swing bracket 21 is swung leftward to be stopped at the center position. However, if the boom 22 is moved upward after the swing bracket 21 is wrongly stopped at a position slightly deviating rightward from the center position, due to the above-mentioned boom interference prevention function, the boom 22 may unexpectedly be stopped halfway. In such a case, the position of the swing bracket 21 has to be corrected. The position correcting operation is troublesome.
In consideration of the problem, the working machine 1 includes a swing center-stopping function to stop the swing bracket 21 at the center position. The swing center-stopping function will be explained.
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The swinging stopper unit 279 temporarily stops the swinging movement which is defined as the swinging movement of the swing bracket, when the swung swing bracket 21 reaches the center position where the boom 22 is oriented in the forward direction of the machine body. In detail, when the swing bracket 21 is swung and is positioned at the center position where the boom 22 is oriented in the forward direction of the machine body, the swinging stopper unit 279 outputs a command signal (a signal to return to the neutral position 268A) to the swing control valve 268 to stop the swinging movement temporarily (for a predetermined time). Due to the command signal, the swing bracket 21 is kept stationary at the center position for the predetermined time. In this manner, the operator can recognize the swing bracket 21 as being positioned at the center position.
The time of stopping the swinging movement is not limited, but is, for example, about one second. That is, the swinging stopper portion 279 releases the stop of swinging movement after a predetermined time has elapsed after the stopping of the swinging movement. Accordingly, when the operator continues to operate the swinging movement tool 267 after the swinging movement is stopped, the swinging movement can be resumed after the predetermined time has elapsed, and thus the swinging movement can be continued.
When the operation of the swing operation tool 267 is released during the stopping of the swinging movement, the swing bracket 21 can be accurately positioned at the center position where the boom 22 is oriented to the forward direction of the machine body. In this manner, the boom 22 can be moved to the uppermost position without unexpected interruption due to the boom interference prevention function. That is, the work of correcting the position of the swing bracket 21 from the off-center position back to the center position can be eliminated.
In the embodiment, in both cases of pivoting the swing bracket 21 to the right and pivoting the swing bracket 21 to the left, the swinging movement is stopped once when the swing bracket 21 reaches the center position.
When the stopping release switch 282 is tuned on, the stopping-function release unit 280 restricts the stopping function (swing center-stopping function) of the swing stopper unit 279 to stop the swinging movement. That is, the swinging stopper unit 279 is not allowed to stop the swinging movement. In this manner, an operator who do not need the swing center-stopping function to use the working machine 1 comfortably. In addition, by operating the stopping release switch 282 to be turned off, the swing center-stopping function can be activated.
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The attachment base 93 is formed at a rear portion thereof with a rearwardly open concave portion 93B defined by a rear edge of the center portion of the main portion 93A, a right edge of the first extending portion 93L, and a left edge of the second extending portion 93R. The concave portion 93B is gradually widened as extending rearward. As shown in
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The gas cylinder 287 is also referred to as a gas spring. For example, a non-flammable high-pressure gas such as nitrogen gas is sealed in the air-tight inside of the cylinder tube 287A, and a reaction force of the gas functions as a spring to push the piston rod 287B in the direction of extending from the cylinder tube 287A. The gas cylinder 287 is a locking gas cylinder provided with a stroke lock mechanism so that the gas cylinder 287 can be fixed at any optional length (extending and retracting of the gas cylinder 287 can be fixed at any position). That is, the piston rod 287B can be stopped at any position in the length direction with respect to the cylinder tube 287A. That is, the length of the gas cylinder 287 can be adjusted in stepless. By adjusting the length of the gas cylinder 287, the height of the attachment base 93 can be adjusted. This allows the height of the manipulator 82 to be adjusted in correspondence to the height of an operator. Adjusting the height of the manipulator 82 improves an operator's working posture and reduces fatigue of the operator.
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The fixing portion 361 is, for example, provided on an upper right side portion of the support pipe 288. The fixing portion 361 includes a slit 362 formed in the support pipe 288, a first member 363 adjacent to one width-directional side of the slit 362, a second member 364 adjacent to the other width-directional side of the slit 362, and a fixture tool 365 to bring the first member 363 and the second member 364 into proximity.
The slit 362 is formed to have a predetermined length extending downward from the upper end of the support pipe 288 and along the axial direction of the support pipe 288. The first member 363 and the second member 364 are arranged facing each other at the upper portion side of the slit 362 to sandwich the slit 362 and are fixed to the support pipe 288.
The first member 363 is penetrated by an insertion hole 363a in a direction parallel to the width direction of the slit 362. The second member 364 includes a threaded hole 364a in a direction parallel to the width direction of the slit 362.
The fixture tool 365 includes a threaded shaft portion 366, a contacting portion 367 formed integrally with the threaded shaft portion 366, an extending portion 368 extending from the contacting portion 367, and an operation handle 369 provided on the extending portion 368. The threaded shaft portion 366 includes a male threaded portion 366a that is screwed into the threaded hole 364a. The contacting portion 367 contacts one of opposite side surfaces of the first member 363, while the other of the opposite side surfaces of the first member 363 faces the second member 364. The extending portion 368 extends in a direction opposite to the male threaded portion 366a.
The fixing portion 361 can bring the first member 363 and the second member 364 into close proximity by grasping the operation handle 369 and rotating the threaded shaft portion 366 in the screwing direction around the axial center. In this manner, the gas cylinder 287 can be fixed to the support pipe 288 so as to be prevented from rattling.
Note that the fixture tool 365 is not limited to the configuration that brings the first member 363 and the second member 364 into proximity by the action of a screw. For example, the fixture tool 365 may have a structure that brings the first member 363 and the second member 364 into close proximity by the action of a cam or the like caused by turning of the operation handle 369.
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The slide member 289A is located on the left side of the guide member 289B, and protrudes upward from the guide member 289B. An upper portion of the guide member 289B is attached to the lower surface of the attachment plate 286 via the attachment member 293. Accordingly, the slide member 289A is attached to the attachment base 93 via the attachment plate 286, thereby being configured to move up and down integrally with the attachment base 93. The slide member 289A is formed in a right side portion thereof with a rightwardly open engagement groove 284 extending in the vertical direction. The guide member 289B is fitted in the engagement groove 284 vertically movably relative to the slide member 289A (see
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The vertical movement limiter 371 is provided, for example, in the anti-rotation mechanism 289. In detail, the vertical movement limiter 371 includes a long hole 372 formed in the slide member 289A and a regulation member 373 attached to the guide member 289B.
The long hole 372 is formed in a predetermined length in the length direction (vertical direction) of the slide member 289A. In addition, the long hole 372 is formed to penetrate through the slide member 289A.
The regulation member 373 is inserted through the long hole 372, and is in contact with the side surface (left side surface) of the guide member 289B. The regulation member 373 is attached to the guide member 289B with a bolt 374. The bolt 374 penetrates through the regulation member 373, and is screwed into a threaded hole 375 formed in the guide member 289A. The regulation member 373 slightly protrudes from the long hole 372 in the direction opposite to the guide member 289B, and is formed such that the fastening force of the bolt 374 does not reach the slide member 289A. The regulation member 373 may be attached to the guide member 289B by welding, riveting, or the like.
Due to the vertical movement limiter 371, the extending limit of the gas cylinder 287 is defined by a lower end of the long hole 372 when contacting a lower end of the regulation member 373, and the retracting limit of the gas cylinder 287 is defined by an upper end of the long hole 372 when contacting an upper end of the regulation member 373. The extending limit of the gas cylinder 287 defines an uppermost movement position of the attachment base 93, and the retracting limit of the gas cylinder 287 defines a lowermost movement position of the attachment base 93. Accordingly, the vertical movement limiter 371 defines the uppermost movement position and the lowermost movement position of the attachment base 93 as respective predetermined positions.
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The at least one armrest 83 is a member on which an operator places his/her elbow. As shown in
The at least one armrest 83 includes a first armrest 83L and a second armrest 83R. The first armrest 83L extends rearward from a rear portion of the first manipulator handle 82L. In detail, the first armrest 83L extends in a rearwardly machine-outward (leftward) direction from the rear side of the first steering handle 82L. The first armrest 83L is located above the first extending portion 93L and along the first extending portion 93L. The first armrest 83L is attached to the first extending portion 93L via a support member 103L.
The second armrest 83R extends rearward from the rear side of the second steering handle 82R. In detail, the second armrest 83R extends in a rearwardly machine-inward (rightward) direction from a rear side of the second manipulator handle 82R. The second armrest 83R is located above the second extending portion 93R and along the second extending portion 93R. The second armrest 83R is attached to the second extending portion 93R via a support member 103R.
In the manipulation device 41 according to the embodiment, an operator places an elbow of his/her left arm on the first armrest 83L and grasps the first manipulator handle 82L with his/her left hand, and places an elbow of his/her right arm on the second armrest 83R and grasps the second steering handle 82R with his/her right hand. Accordingly, the operator operates the manipulator 82 with his/her upper body in a forward leaning posture while sitting on the driver seat 6. In this manner, the operator takes a posture to operate the first manipulator handle 83L and the second manipulator handle 83R with his/her upper body close to the front surface of the cabin 5. By positioning the manipulator 82 and the armrests 83 in front of the driver seat 6, the left and right sides of the cabin 5 are brought closer to the driver seat 6, thereby minimizing the cabin 5 in the machine width direction K2. In addition, the manipulation device 41 (manipulator console 81) and the operator seat 6 are arranged in close proximity in the fore-and-aft direction, the operator seat 6 is brought closer to the manipulation device 41, thereby minimizing the operator section 42 (cabin 5) in the fore-and-aft direction.
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A plurality of operation switches (a first switch 84B, a second switch 84C, and a third switch 84D) are provided on a side of the display 84A of the monitor 84 facing the operator seat 6. The first switch 84B is, for example, a switch to change a revolving speed of the prime mover E1. The second switch 84C is, for example, a switch to set a working speed of the working machine 1. The working speed is, for example, pivoting speeds of the boom 22, the arm 23, the bucket 24, and the swing bracket 21, and the swiveling speed of the machine body 2. The third switch 84D is a switch to turn on and off lights provided on the working machine 1, for example, a boom light, a front light, a rear light, and the like.
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The traveling operation device 85 is a foot-stepping operable pedal to operate the traveling device 3. As shown in
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The dozer lever 80 is an operation lever for operating the dozer 7.
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Describing the duct structure body 296 in detail, as shown in
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The second side plate portion 308 is fixed to the bottom plate portion 304 so as to extend upward from a right end portion of the bottom plate portion 304. The second side plate portion 308 is fixed at a front end portion thereof to the front plate portion 305, and at a rear end portion thereof to the rear plate portion 306. As shown in
As described above, the second duct 298 includes the front portion extended through the second opening 303 and the rear portion extended through the first opening 300, and includes the upper end opening that is located forward of the first opening 300 and rearward of the second opening 303 and is closed by the floor portion 5B.
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Since the duct structure body 296 can blow the air-conditioned air from the position close to the front window 5C, the visibility of the front window 5C can be secured quickly during the demisting and defrosting.
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Since the third duct 299 is configured so that the longitudinal width of its upper portion is less than that of its lower portion, the flow velocity of the air-conditioned air blown out from the first outlet 299g can be prevented from slowing down.
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The front support frame 146 includes a first front pillar 146A and a second front pillar 146B located side by side in the machine width direction K2, and a front beam 146C connecting upper portions of the first front pillar 146A and the second front pillar 146B to each other.
The rear support frame 147 includes an upright frame 316 erected on the machine body 2, a connecting frame 317 connecting the upright frame 316 to the weight 10, and a protruding frame 318 protruding forward from the upright frame 316. The upright frame 316 includes a first vertical member 316A, a second vertical member 316B, a third vertical member 316C, a first lateral member 316D, and a second lateral member 316E.
The first vertical member 316A, the second vertical member 316B and the third vertical member 316C are arranged side by side in the machine width direction K2, and stand on the swiveling base plate 9. The first vertical member 316A is located in front of the center portion of the weight 10 in the machine width direction K2. The second vertical member 316B is spaced rightward from the first vertical member 316A. The third vertical member 316C is spaced rightward from the second vertical member 316B.
The first lateral member 316D connects upper portions of the first vertical member 316A and the second vertical member 316B to each other. The second lateral member 316E connects upper portions of the second vertical member 316B and the third vertical member 316C to each other. The connecting frame 317 connects a left portion of the first lateral member 316D to a center portion, in the machine width direction K2, of an upper end of the weight 10. The protruding frame 318 protrudes upward from the upper portion of the first vertical member 316A to above a valve receiving base 319.
A space between the front support frame 146 and a right portion of the rear support frame 147 (defined as a frame body constituted of the second vertical member 316B, the third vertical member 316C, and the second lateral member 316E) is a prime mover arrangement section 320 where the prime mover E1 is mounted.
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Respective mount support bases are attached to the first to fourth attachment members 321A to 321D, and the prime mover E1 is vibro-isolatedly supported on the respective mount support bases.
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The second plate 325B is extended laterally with its plate surface facing vertically, and includes a rear portion fixed to a vertically intermediate portion of the first plate 325A. Accordingly, the second plate 325B protrudes forward from the first plate 325A. In addition, the second plate 325B is located below the filter joint portion 323 and the oil filter 322. The first reinforcing portion 330A and the second reinforcing member 330B are fixed to a rear upper surface of the second plate 325B. The first reinforcing portion 330A protrudes rightward from the first plate 325A. The second reinforcing member 330B protrudes forward from a right end of the first reinforcing portion 330A.
The second plate 325B includes a front portion defined as a mount attachment portion 327 to which the prime mover mount (mount member) 324 is attached. As shown in
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The front wall 331b is joined respectively to the first side wall 331d and the second side wall 331e by welding, the rear wall 331c is joined respectively to the first side wall 331d and the third side wall 331g by welding, and the second side wall 331e is joined to the third side wall 331g by welding. In this way, the walls constituting the receptacle 331 are joined to each other by welding to eliminate gaps therebetween. Accordingly, the receptacle 331 surely holds oil received therein.
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In the following description, the first engagement pin 332A and the second engagement pin 332B are collectively referred to as an engagement pin 332.
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In the following description, the first insertion hole 333A and the second insertion hole 333B are collectively referred to as an insertion hole 333.
By inserting the engagement pin 332 into the insertion hole 333, the receptacle 331 is attached to the support base 325. That is, the receptacle 331 is removably installed on the support base 325. In addition, the receptacle 331 can be easily installed or removed by simply moving the receptacle 331 in the vertical direction.
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In addition, after the oil filter 322 is removed, the receptacle 331 can be lifted to a position where the engagement pin 332 can be removed entirely from the insertion hole 333. Accordingly, by removing the oil filter 322, the receptacle 331 can be removed from the support base 325. That is, the receptacle 331 can be removed (at need) when the oil filter 322 is replaced with a new one. When the oil filter 322 is replaced with a new one, the receptacle 331 receives oil flowing down from the oil filter 322 and the filter joint portion 323, and the receptacle 331 can be removed to discharge the oil therefrom.
In addition, since the engagement pin 332 is provided closer to the filter head portion 322b than the filter joint portion 323, the receptacle 331 can be easily attached. That is, in attaching the receptacle 331, the engagement pin 332 and the insertion hole 333 can be easily watched, and thus the engagement pin 332 can be easily inserted into the insertion hole 333 while looking at the engagement pin 332 and the insertion hole 333. In addition, as shown by virtual lines G2 in
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In addition, since the support base 325 for mounting the prime mover mount 324 thereon is also used for mounting the receptacle 331 thereon, cost reduction can be achieved through the dual use of the component.
The hood 16 includes an openable cover on an machine-outward side surface thereof, such that, when the cover is opened, the oil filter 322 and the receptacle 331 can be easily accessed.
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The bottommost section (i.e., the fourteenth section VS14) of the control valve V1 is joined to the base plate 338 and the main plate 340, and some (i.e., the first section VS1, fourth section VS4, and eleventh section VS11) of the sections constituting the control valve V1 are joined to the main plate 340 (of the vertical plate 339), thereby guarding the sections of the control valve V1 against a force causing a positional displacement of the sections. In addition, since the load from the control valve V1 is received by the base plate 338, a large load does not act on the vertical plate 339, thereby lightening the valve base 337. That is, the vertical plate 339 requires only a strength that is enough to prevent the control valve V1 from being twisted, so that the thickness of the vertical plate 339 does not have to be increased to support the control valve V1, thereby lightening the valve base 337 can be made lighter.
For example, when the vertical plate 339 (or the main plate 340) is fixed to the base plate 338 by welding, it is difficult to fix the vertical plate 339 accurately (perpendicular) to the base plate 338 because distortion (deformation) occurs in their welded portions. If the vertical plate 339 is not accurately fixed to the base plate 338, a stress (strain) will act on the fourteenth section VS14 in tightening the bolts to fix the fourteenth section VS14 to the base plate 338 and the vertical plate 339. In contrast, in the embodiment, the vertical plate 339 is not welded to the base plate 338 and separated from the base plate 338, thereby preventing a stress from acting on the fourteenth section VS14.
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The anti-sway member 352 suppresses a horizontal swaying of the valve base 337 and the control valve V1 while absorbing horizontal vibrations of the valve base 337 and the control valve V1 by the anti-vibration bushing 355.
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The operation member 387 includes a rod 387a attached to the lock pin 385 and a knob 387b fixed to the rod 387a. One end portion of the rod 387a is defined as a penetrating portion 387c that is passed crossingly (orthogonally) through a middle portion (a center portion) of the lock pin 385. The knob 387b is fixed to the other end portion of the rod 387a. A portion (i.e., a regulated portion) 387d of the rod 387 between the penetrating portion 387c and the knob 387b can be inserted into the regulating groove 389 under a state where the front portion of the lock pin 385 is inserted into the lock hole 384. By fitting the regulated portion 387d in the regulating groove 389, an axial (fore-and-aft) movement of the lock pin 385 is regulated, and the lock pin 385 is prevented from escaping from the lock hole 384. By grasping the knob 387b and rotating the operation member 387 upward around the axis of the lock pin 385, the regulated portion 387d (of the rod 387) is released from the regulating groove 389 as shown by the virtual line in
The gas spring 378 is a spring to bias the elevation cylinder 376 and the attachment plate 286 upward so as to assist the upward movement of the elevation cylinder 376 and the attachment plate 286. As shown in
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The regulation member 399 is inserted through the long hole 398 and is brought in contact with a front surface of the elevation cylinder 376. The regulation member 373 is formed to have a rectangular shape long in the longitudinal direction of the long hole 398, and is attached to the elevation cylinder 376 with a first bolt 400A and a second bolt 400B. The first bolt 400A penetrates through the regulation member 399, and is screwed into a threaded hole 401A formed in the elevation cylinder 376. The second bolt 400A is located below the first bolt 400A, and penetrates through the regulation member 399 and screwed into a threaded hole 401B formed in the elevation cylinder 376. The regulation member 399 slightly protrudes from the long hole 398 in the direction opposite to the elevation cylinder 376, so that tightening forces of the first bolt 400A and the second bolt 400B do not act on the support pipe 288. The regulation member 373 may be attached to the elevation cylinder 376 by welding, riveting, or the like.
In the vertical movement limiter 397, an upper end of the regulation member 399 contacts an upper end of the long hole 398 to define an extension limit of the gas spring 378, and a lower end of the regulation member 399 contacts a lower end of the long hole 398 to define a contraction limit of the gas spring 378. In this manner, over-extension and over-contracting of the gas spring 378 can be prevented, and the vertical position adjustment of the attachment base 93 can be allowed. In addition, by defining the extension limit of the gas spring 378, the upward movement limit position of the attachment base 93 is defined as a predetermined position, and by defining the contracting limit of the gas spring 378, the downward movement limit position of the attachment base 93 is defined as a predetermined position. Accordingly, the vertical movement limiter 397 defines the upward movement limit position and the downward movement limit position of the attachment base 93 as predetermined positions. In addition, the vertical movement limiter 397 has a rotation-stopping function that restricts axial rotation of the elevation cylinder 376 relative to the support pipe 288.
The vertical movement limiter 397 can be modified in various ways. For example, the long hole 398 may be formed in the elevation cylinder, and the regulation member 399 may be attached to the support pipe 288.
First, an outline of the duct structure body 296 according to this alternative embodiment will be described. As shown in
This duct structure body 296 is described in detail below.
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The first branching portion 407b extends forward from a left side of the rear position 407a. The first branching portion 407b extends to the front side of the elevation device 86 through the left side (or one side) of the elevation device 86 (or the manipulation device 41). In addition, the first branching portion 407b is extended upward at the left side of the elevation device 86.
The second branching portion 407C extends forward from a right side of the rear portion 407a. The second branching portion 407c extends to the front side of the elevation device 86 through the right side (or the other side) of the elevation device 86 (or the manipulation device 41). In addition, the second branching portion 407c is extended upward at the right side of the elevation device 86.
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In this alternative embodiment, the support base 325 is configured in a manner similar to the configuration of the first embodiment. That is, as shown in
An attachment base 416 to which a later-discussed locking tool 417 is attached is fixed to the rear portion of the second plate 325B. The attachment base 416 is located between the first plate 325A and the second reinforcing member 330B. The attachment base 416 includes an upper wall portion 416a, a first side wall portion 416b and a second side wall portion 416c. The first side wall portion 416b extends downward from a left end of the upper wall portion 416a and is fixed to the second plate 325B, and the second side wall portion 416c extends downward from a right end of the upper wall portion 416a and is fixed to the second plate 325B.
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The second hole portion 422b has a width in the machine width direction K2 that is larger than that of the first hole portion 422a in the machine width direction K2. Alternatively, the width of the second hole portion 422b in the machine width direction K2 may be the same as that of the first hole portion 422a in the machine width direction K2.
In this alternative embodiment, as shown in
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The attachment base 417 is joined to the attachment base 416 (i.e., the upper wall portion 416a) with bolts or the like.
The operation body 428 is supported on the attachment base 417 rotatably around a first axis X3 extending in the machine width direction K2.
The left arm unit 429 is located on a left side of the operation body 428, and the right arm unit 429 is located on a right side of the operation body 428. Each arm unit 429 includes a first arm 429a on the machine inward directional side and a second arm 429b on the machine outward directional side. The first arm 429a includes a rear portion attached to the operation body 428 rotatably around a second axis X4 extending in the machine width direction K2. The second axis X4 is located behind the first axis X3. The first arm 429a includes a front portion defined as a spring retainer 429c. The second arm 428b includes a rear portion defined as a spring retainer 429d. A biasing member 431 is interposed between the spring retainer 429c and the spring retainer 429d. The biasing member 431 is formed of a coil spring, and is wound around mutually overlapping portions of the first arm 429a and the second arm 429b. A support shaft 432 is located between the front portions of the second arm 429b of the left arm unit 429 and the second arm 429b of the right arm unit 429.
The hooking pin 430 is formed to have a cylindrical shape, and is externally fitted on the support shaft 432.
The fixing mechanism 426 is configured to fix the receptacle 331 through an operation described below.
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In this alternative embodiment, the receptacle 331 is restricted by the oil filter 322 from being detached, and can be detached when the oil filter 322 is removed.
In addition, the upward movement of the receptacle 331 is restricted by the oil filter 322, and thereby the engagement pin 421 is restricted from being detached from the insertion hole 422.
Other configurations of the other embodiment are configured in the same manner as the configuration of the first embodiment.
The working machine 1 according to the embodiment provides the following effects.
The working machine 1 includes the machine body 2, the support bracket 20 protruding forward from the machine body 2, the swing bracket 21 pivotally supported by the support bracket 20 to be capable of horizontally pivoting, the working device 4 attached to the swing bracket 21, the swing sensor 261 configured to detect a position of the swing bracket 21, the controller U1 configured to acquire a detection signal from the swing sensor 261 and to control the pivotal movement of the swing bracket 21, and the regulator switch 281 connected to the controller U1. The controller U1 includes the memory unit 276 configured to store the arbitrary regulation position when the swing bracket 21 is stopped at the arbitrary regulation position and the regulator switch 281 is turned on, and the pivoting stopper unit 277 configured to stop the pivotal movement of the swing bracket 21 when the swing sensor 261 detects that the swing bracket 21 reaches the regulation position.
According to this configuration, the working device 4 can be prevented from interfering with the machine body 2 or the operator section or the like mounted on the machine body 2.
In addition, the controller U1 includes the memory release unit 284 to release the memory of the memory portion 276 when the regulator switch 281 is turned off or when a regulation release switch different from the regulator switch 281 is operated.
According to this configuration, the regulation position can be reset, for example, when the different working tool 24 is attached to the working device 4.
In addition, the working device sensor is provided to detect the state of the working device 4, the controller U1 is configured to obtain a detection signal from the working device sensor, and the memory unit 276 stores the regulation position of the swing bracket 21 defined when the working device 4 is in a predetermined state.
According to this configuration, the regulation position can be set in correspondence to the state of the working device 4.
In addition, the working device 4 includes the boom 22 supported by the swing bracket 21 pivotably in the vertical direction, the arm 23 pivotably supported by the boom 22 to pivot in directions toward and away from the boom 22, and the working tool 24 pivotably supported by the arm 23 to pivot in directions toward and away from the arm 23. The predetermined state of the working device 4 is the state in which the boom 22 reaches the uppermost pivotal movement position, the arm 23 reaches the pivotal movement position closest to the boom 22, and the working tool 24 reaches the pivotal movement position closest to the arm 23.
According to this configuration, the regulation position is set in the state where the working device 4 is highly likely to cause interference with the operator section 42, thereby preventing the interference of the working device 4 with the operator section 42.
In addition, the working machine 1 includes the operator section 42 having the operator seat 6 and the manipulation device 41 mounted on the machine body 2, and the regulation position can be set at a pivotal movement position of the swing bracket 21 closer to the operator section 42 than the center position where the boom 22 is oriented in the forward direction of the machine body 2.
According to this configuration, the working device 4 in the area where it is highly likely to interfere with the operator section 42 can be prevented from causing the interference.
In addition, any one selected from various working tools 24 of different sizes can be attached.
According to this configuration, the position at which the working tool 24 is stopped can be set in correspondence to the kind of working tool 24 to be attached, and even when any one is selected from the various types of working tool 24, the operator can carry out operations freely from the fear of the interference of the working tool 24 with the operator section 42.
In addition, the working machine 1 includes the operator section 42 having the operator seat 6 and the manipulation device 41 mounted on the machine body 2, and the boom sensor 263A configured to detect a pivoting angle of the boom 22. The controller U1 judges, based on the detection results of the swing sensor 261 and the boom sensor 263A, a position of the boom 22 during the pivotal movement of the swing bracket 21 with the boom 22 having been pivoted upward to a lateral side of the operator section 42, and stops the pivoting movement of the swing bracket 21 before reaching a position where the boom 22 comes to interfere with the operator section 42.
According to this configuration, the boom 22 can be prevented from interfering with the operator section 42.
In addition, the working machine 1 includes the operator section 42 having the operator seat 6 and the manipulation device 41 mounted on the machine body 2, and the boom sensor 263A configured to detect a pivoting angle of the boom 22. The controller U1 judges, based on the detection results of the swing sensor 261 and the boom sensor 263A, a position of the boom 22 when pivoted upward with the swing bracket 21 having been pivoted to a position more laterally distant from the operator section 42 than the center position where the boom 22 is orientated in the forward direction of the machine body, and the controller U1 stops the pivotal movement of the boom 22 before reaching a position where the boom 22 comes to interfere with the operator section 42.
According to this configuration, the boom 22 can be prevented from interfering with the operator section 42.
In addition, the working machine 1 includes the machine body 2, the support bracket 20 protruding forward from the machine body 2, the swing bracket 21 pivotably supported by the support bracket 20 to be capable of horizontally pivoting, the working device 4 attached to the swing bracket 21, the swing sensor 261 configured to detect a position of the swing bracket 21, the operator section 42 having the driver seat 6 and the steering device 41 mounted on the machine body 2, the boom sensor 263A configured to detect a pivoting angle of the boom 22, and the controller U1 configured to acquire the detection signals from the swing sensor 261 and the boom sensor 263A. The boom 22 can be pivoted upward to a lateral side of the operator section 42. The controller U1 judges, based on the detection results of the swing sensor 261 and boom sensor 263A, a position of the boom 22 during the pivotal movement of the swing bracket 21 with the boom 22 having been pivoted upward to the lateral side of the operator section 42, and the controller U1 stops the pivotal movement of the swing bracket 21 before reaching a position where the boom 22 comes to interfere with the operator section 42.
According to this configuration, the boom 22 can be prevented from interfering with the operator section 42.
In addition, the working machine 1 includes the machine body 2, the support bracket 20 protruding forward from the machine body 2, the swing bracket 21 pivotably supported by the support bracket 20 to be capable of horizontally pivoting, the working device 4 attached to the swing bracket 21, the swing sensor 261 configured to detect a position of the swing bracket 21, the operator section 42, having the driver seat 6 and the steering device 41, mounted on the machine body 2, the boom sensor 263A configured to detect a pivoting angle of the boom 22, and the controller U1 configured to acquire the detection signals from the swing sensor 261 and the boom sensor 263A. The boom 22 can be pivoted upward to a lateral side of the operator section 42. The controller U1 judges, based on the detection results of the swing sensor 261 and the boom sensor 263A, a position of the boom 22 when pivoted upward with the swing bracket 21 having been pivoted to a position more laterally distant from the operator section 42 than the center position where the boom 22 is orientated in the forward direction of the machine body, and the controller U1 stops the upward pivotal movement of the boom 22 before reaching a position where the boom 22 comes to interfere with the operator section 42.
According to this configuration, the boom 22 can be prevented from interfering with the operator section 42.
In addition, the working machine 1 includes the machine body 2, the support bracket 20 protruding forward from the machine body 2, the swing bracket 21 pivotably supported by the support bracket 20 to be capable of horizontally pivoting, the boom 22 pivotably supported by the swing bracket 21 to be capable of pivoting up and down, the swing sensor 261 configured to detect a position of the swing bracket 21, and the controller U1 configured to acquire the detection signal from the swing sensor 261 and to control the swinging movement defined as the pivotal movement of the swing bracket 21. The controller U1 includes the swinging stopper unit 279 configured to stop the swinging movement when the swing bracket 21 in the pivotal movement reaches the center position where the boom 22 is orientated in the forward direction of the machine body 2.
According to this configuration, the swinging movement is stopped when the swing bracket 21 is positioned at the center position, and the operator can recognize that the swing bracket 21 is positioned at the center position, thereby ensuring the positioning of the swing bracket 21 at the center position.
The swinging stopper unit 279 releases the stop of the swinging movement after passage of a predetermined time from the stop of the swinging movement.
According to this configuration, working can be continued when it is not necessary to stop the swing bracket 21 at the center position.
In addition, the working machine 1 includes the stopping release switch 282 connected to the controller U1. The controller U1 includes the stopping-function release unit 280 that is configured so that, according to operation of the stopping release switch 282, the stopping-function release unit 280 prevents the swinging stopper portion 279 from stopping the swinging movement.
According to this configuration, the working machine 1 can be used comfortably by an operator who does not require the center-stopping function of the swinging movement.
In addition, the working machine 1 includes the operator section 42, having the driver seat 6 and the steering device 41, mounted on the machine body 2, and the detection sensor 285 configured to detect a position of the boom 22 with respect to the operator section 42, and the controller U1 includes the boom stopper unit 278 configured to acquire a signal from the detection sensor 285, and stops the boom 22 before reaching a position where the boom 22 comes to interfere with the operator section 42.
According to this configuration, the boom 22 can be prevented from interfering with the operator section 42.
In addition, the working machine 1 includes the prime mover E1, the oil filter 322 attached to the prime mover E1, the support base 325 provided below the oil filter 322, and a receptacle 331 provided detachably on the support base 325. The receptacle 331 is configured to receive oil flowing down from the oil filter 322 when being detached, and is configured to retain the received oil.
According to this configuration, the oil flowing down from the oil filter 322 when being removed can be received and retained by the receptacle 331, and disposal of the retained oil can be achieved by detaching the receptacle 331 from the support base 325. Accordingly, the oil remaining in the receptacle 331 can be prevented from dripping off and contaminating the surroundings.
In addition, the oil filter 322 restricts the receptacle 331 from being detached from the support base 325, so that the receptable 331 is allowed to be detached when the oil filter 322 is detached.
According to this configuration, the receptacle 331 cannot be detached except when necessary, such as when replacing the oil filter 322, and the loss of the receptacle 331 can be prevented.
In addition, the receptacle 331 includes the engagement pins (first engagement pin 332A, second engagement pin 332B, engagement pin 421) that are inserted into the insertion holes (first insertion hole 333A, second insertion hole 333B, insertion hole 422) formed in the support base 325. The oil filter 322 restricts the upward movement of the receptacle 331 to restrict the detachment from the insertion holes.
According to this configuration, attachment, detachment, and prevention of detachment of the receptacle 331 can be performed with a simple configuration.
In addition, the working machine 1 includes the fixing mechanism 426 configured to fix the receptacle 331 to the support base 325 by pressing the engagement pin 421 against the contacting portion 422c formed on the inner surface of the insertion hole 422.
According to this configuration, the receptacle 331 is prevented from rattling due to vibrations of the machine body 2 or the like.
In addition, the fixing mechanism 426 includes the pressure portion 424 and the locking tool 417. The pressure portion 424 is provided on the engagement pin 421 and is configured to contact the contacting portion 422c with the engagement pin 421 inserted into the insertion hole 422. The locking tool 417 is operable to press the pressure portion 424 against the contacting portion 422c. The pressure portion 424 includes the pressure surface 424a to be pressed against the contacting portion 422c. The pressure surface 424a has an inclining shape shifting in the horizontal direction as extending upward.
According to this configuration, the upward movement and horizontal movement of the receptacle 331 can be restricted with a simple configuration.
In addition, the prime mover E1 includes the filter joint portion 323 to which the base portion 322a of the oil filter 322 is joined. The oil filter 322 includes a filter head portion 322b opposite to the base portion 322a, and the engagement pin is provided closer to the filter head portion 322b than the filter joint portion 323.
According to this configuration, the engagement pin and the insertion hole can be easily watched, and the receptacle 331 can be easily attached.
In addition, the working machine 1 includes the machine body 2 in which the prime mover E1 is mounted. The support base 325 is attached to the prime mover E1 and supported by the machine body 2 via the vibro-isolating mount member (the prime mover mount 324).
According to this configuration, the structure can be simplified through the dual use of the component.
In addition, the working machine 1 includes the machine body 2, the valve base 337 having the base plate 338 attached to the machine body 2, the control valve V1 attached to the valve base 337, the support frame (the rear support frame 147) provided on the machine body 2, the vertical plate 339 located above the base plate 338 in separation from the base plate 338, and the anti-sway member 352 connecting the upper portion of the vertical plate 339 to the support frame (the rear support frame 147). The control valve V1 is the composite control valve of the sectional type with the plurality of control valves coupled to one another and stacked one on another in the vertical direction. The lowermost section (the fourteenth section VS14) is placed on the base plate 338 and fixed to the base plate 338 with bolts, and the plurality of sections are fixed to the vertical plate 339 with bolts.
According to this configuration, the force acting on the control valve V1 acts on the base plate 338 through the lowermost section, so that a large load does not act on the vertical plate 339, and the valve base 337 can be made lighter. In addition, by fixing the plurality of sections to the vertical plate, the sections can be prevented from slipping against each other.
In addition, the lowermost section of the control valve V1 is fixed to the vertical plate 339 with bolts.
According to this configuration, the sections are more appropriately prevented from slipping against each other.
In addition, the working machine 1 includes the weight 10 attached to the machine body 2, and the support frame includes the upright frame 316 erected on the machine body 2, the connecting frame 317 connecting the upright frame 316 and the weight 10, and the protruding frame 318 protruding upward from the upright frame 316 to above the valve base 337. The anti-sway member 352 connects the protruding frame 318 to the vertical plate 339.
According to this configuration, the upper portion of the valve base 337 can be securely supported.
In addition, the vertical plate 339 includes the upper portion defined as the connecting plate 341, and the anti-sway member 352 includes the attachment stay 353 attached to the protruding frame 318, the retaining cylinder 354 fixed to the attachment stay 353, the anti-vibration bush 355 held in the retaining cylinder 354, and the attachment tool 359 configured to attach the anti-vibration bush 355 to the connecting plate 341.
According to this configuration, the valve base 337 is vibro-isolated with a simple configuration.
In addition, the connecting plate 341 includes the engagement portion (the first engagement portion 342A, the second engagement portion 342B) to engage the suspension tool 359 for suspending the valve base 337.
According to this configuration, the structure is simplified through the dual use of the component.
In addition, the working machine 1 includes the valve receiving base 319 fixed to the machine body 2, and the valve mounts (the first to fourth valve mounts 336A to 336D) to vibro-isolatedly support the base plate 338 on the valve receiving base 319.
According to this configuration, the vibration of the control valve V1 can be effectively suppressed.
In addition, the working machine 1 includes the operator seat 6, the manipulation device 41 located in front of the operator seat 6, the front window 5C located in front of the manipulation device 41, the air-conditioner body 63 located below the operator seat 6, and the duct structure body 296 extending forward from the air-conditioner body 63 and upward in the space between the manipulation device 41 and the front window 5C.
According to this configuration, the duct structure body 296, which distributes the air-conditioned air blown from the air-conditioner body 63, extends upward in the space between the manipulation device 41 and the front window 5C, so that the duct structure body 296 can be brought closer to the front window 5C, and the visibility of the front window 5C can be secured quickly during demisting and defrosting. In addition, by extending the duct structure body 296 forward, and extending the duct structure body 296 upward in the space between the steering device 41 and the front window 5C, the portion of the duct structure body 296 between the manipulation device 41 and the front window 5C can be shortened, and accordingly the airflow reduction can be suppressed.
In addition, the duct structure body 296 branches off on the rear side of the manipulation device 41, and the branches of the duct structure body 296 pass through the left and right sides of the manipulation device 41, and join together on the front side of the steering device 41.
According to this configuration, above the floor portion 5B, the duct structure body 296 can be extended bypassing the manipulation device 41 with a small length from the air conditioner body 63 until it reaches the position between the manipulation device 41 and the front window 5C.
In addition, the working machine 1 includes the operator section 42 in which the operator seat 6, the manipulation device 41, and the air-conditioner body 63 is installed. The duct structure body 296 includes the first duct 406 connected to the blowing outlet 63a of the air-conditioner body 63, the second duct 407 connected to the first duct 406 and located above the floor portion 5B of the operator section 42 to extend forward, and the third duct 408 provided between the steering device 41 and the front window 5C and connected to the second duct 407. The second duct 407 includes the first branching portion 407b that passes through the left side of the steering device 41 and is connected to the third duct 408, and the second branching portion 407c that passes through the right side of the steering device 41 and is connected to the third duct 408.
According to this configuration, the second duct 407 can be easily assembled with the manipulation device 41 stood on the floor portion 5B.
In addition, the first branching portion 407b and the second branching portion 407c extend upward on the front side of the manipulation device 41, and the third duct 408 includes the first connecting portion 408e connected to the first branching portion 407b, and the second connecting portion 408f connected to the second branching portion 407c.
According to this configuration, the third duct 408 can be easily assembled with the manipulation device 41 stood on the floor portion 5B.
In addition, the first duct 406 includes the connection port 409 connected to the blowing outlet 63a of the air-conditioner body 63, the main duct portion 410 that extends forward from the connection port 409 and is connected to the second duct 407, and the side duct portion 411 that branches off from the connection port 409 to extend rearward and blows the air-conditioned air to the side of the driver seat 6.
According to this configuration, the side duct portion 411, which blows the air-conditioned air to the side of the driver seat 6, can be arranged in a short path from the blowing outlet 63a of the air conditioner body 63.
In addition, the working machine 1 includes the driver seat 6, the manipulation device 41, and the operator section 42 in which the air-conditioner body 63 is installed, and the duct structure body 296 includes the first duct 297 connected to the blowing outlet 63a of the air-conditioner body 63, the second duct 298 located below the floor portion 5B of the operator section 42 and connected to the first duct 297 to extend forward, the third duct 299 provided between the manipulation device 41 and the front window 5C and connected to the second duct 298.
According to this configuration, the cabin space around the operator seat 6 can be widened by arranging the duct structure body 296 under the floor portion 5B.
In addition, the second duct 298 may have a rectangular cross-section shape perpendicular to the extending direction, such that the length of the rectangular shape in the direction along the floor portion 5B is longer than the length thereof in the direction perpendicular to the floor portion 5B.
According to the above configuration, even when the second duct 298 is located in a limited space below the floor portion 5B, the flow path area of the second duct 298 can be sufficiently large, so that the flow path resistance of the air-conditioned air can be reduced and the air volume can be increased.
In addition, the third ducts 299 and 408 includes the first blower portions 299g and 408a located at the upper ends thereof and configured to blow the air-conditioned air toward the front window 5C. Each of the first blower portions 299g and 408a includes the lateral width in the width direction of the machine body 2 being substantially constant from the upper portion to the lower portion, and the longitudinal width of the upper portion in the fore-and aft direction of the machine body 2 being narrower than that of the lower portion.
According to this configuration, the flow speed of the air-conditioned air blown out from the first blowing portions 299g and 408a can be prevented from being reduced.
In addition, the duct structure body 296 includes the fourth duct 313 branched from the third duct 299, and the second blower portion 314 configured to blow out, toward the operator seat 6 side, the air-conditioned air distributed through the fourth duct 313.
According to this configuration, the air-conditioned air can be supplied to the operator seat 6 side.
In addition, the second blower portion 314 is connected to the fourth duct 313 with the telescopic tube 315.
According to this configuration, the second blower portion 314 can be brought closer to the operator.
In addition, the second blower portion 314 is detachable from the fourth duct 313.
According to this configuration, the second blower portion 314 can be selectively located at either the position attached to the fourth duct 313 or the position close to the operator 295 according to the requirement, which provides significant convenience.
In addition, the telescopic tube 315 can be curved, and the orientation of the second blower portion 314 can be set as desired by curving the telescopic tube 315.
According to this configuration, the position and orientation of the second blower portion 314 can be changed as desired. This allows the operator 295 to apply the air-conditioned air to the desired portion.
In addition, the working machine 1 includes the operator seat 6 mounted on the machine body 2, the manipulation device 41 that is located in the vicinity of the operator seat 6 and stands on the machine body 2, and the working device 4 located at the front portion of the machine body 2. The manipulation device 41 includes the manipulator 82 to operate the working device 4, the attachment base 93 on which the manipulator 82 is attached, and the elevation device 86 configured to support the attachment base 93 to be capable of adjusting the vertical position of the attachment base 93.
According to this configuration, the height of the manipulator 82 can be adjusted in accordance with the height of the operator or the like.
In addition, the elevation device 86 includes the support pipe 288 erected on the machine body 2, the elevation cylinder 376 inserted into the support pipe 288 to be capable of being lifted and lowered and provided with the attachment base 93, the gas spring 378 to bias the elevation cylinder 376 upward, and the position adjuster unit 383 configured to adjust the vertical position of the elevation cylinder 376 relative to the support pipe 288.
According to this configuration, the height position of the attachment base 93 can be easily adjusted with use of the biasing force of the gas spring 378.
In addition, the harness 382 that is connected to a device attached to the attachment base 93 is arranged in the elevation cylinder 376.
According to this configuration, the arrangement path of the harness 382 can be easily secured, and the harness 382 can be protected.
In addition, the gas spring 378 is located inside the elevation cylinder 376 at a position deviated from the center C1 of the elevation cylinder 376.
According to this configuration, the space inside the elevation cylinder 376 can be effectively utilized. For example, in arranging the harness 382 inside the elevation cylinder 376, the space for arranging the harness 382 can be easily secured, and the harness 382 can be prevented from being in contact with the gas spring 378.
In addition, the position adjuster unit 383 includes a plurality of lock holes 384 formed on the elevation cylinder 376 and arranged with at least one interval therebetween in the vertical direction, and the lock pin 385 provided in the support pipe 288 and configured to be inserted selectively into any one of the plurality of lock holes 384.
According to this configuration, the position adjuster portion 383 can be easily configured.
In addition, the elevation device 86 includes the vertical movement limiter 397 configured to define the extension limit and the contraction limit of the gas spring 378, and the vertical movement limiter 397 includes the long hole 398 elongated in the vertical direction and formed in one of the support pipe 288 and the elevation cylinder 376, and the regulation member 399 inserted through the long hole 398 and attached to the other one of the support pipe 288 and the elevation cylinder 376.
According to this configuration, over-extending and over-contracting of the gas spring 378 is prevented, and the vertical position of the attachment base 93 can be easily adjusted.
The elevation device 86 includes the slit 362 formed to extend downward from the upper end of the support pipe 288, the first member 363 fixed to the support pipe 288 on one side of the slit 362 in the width direction, the second member 364 fixed to the support pipe 288 on the other side of the slit 362 in the width direction, and the fixing tool 365 configured to bring the first member 363 and the second member 364 into proximity.
According to this configuration, the elevation cylinder 376 can be fixed to the support pipe 288, and accordingly the rattling of the elevation cylinder 376 can be prevented.
In addition, the elevation device 86 includes the gas cylinder 287 including the cylinder tube 287A extend in the vertical direction and the piston rod 287B vertically movably supported by the cylinder tube 287A. The piston rod 287B is connected to the attachment base 93 and is biased upward by the gas enclosed in the cylinder tube 287A, and is capable of stopping at any position with respect to the cylinder tube 287A.
According to this configuration, the height of the manipulator 82 can be adjusted with a simple configuration.
In addition, the elevation device 86 includes the support pipe 288 erected on the machine body 2 and supporting the cylinder tube 287A, the guide member 289B attached to the support pipe 288, and the slide member 289A attached to the attachment base 93 and guided up and down by the guide member 289B.
According to this configuration, the attachment base 93 can be prevented from turning.
In addition, the gas cylinder 287 includes the head member 287C provided on the tip end side of the piston rod 287B and attached to the attachment base 93, and the lock release lever 287D to release the stopping of the piston rod 287B with respect to the cylinder tube 287A. The lock release lever 287D extends from the head member 287C toward the operator seat 6.
According to this configuration, the height of the manipulator 82 can be easily adjusted from the operator seat 6.
In addition, the manipulation device 41 is located in front of the operator seat 6 and includes the armrest member 83, the manipulator 82 includes the first manipulator handle 82L and the second manipulator handle 82R located on the side of the first manipulator handle 82L, and the armrest member 83 includes the first armrest 83L extending rearward from the rear side of the first manipulator handle 82L and the second armrest 83R extending rearward from the rear side of the second manipulator handle 82R.
According to this configuration, the height of the armrest member 83 can be adjusted at the same time along with the height adjustment of the manipulator 82.
While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.
Number | Date | Country | Kind |
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2018-241465 | Dec 2018 | JP | national |
This application is a continuation application of International Application No. PCT/JP2019/047910, filed on Dec. 6, 2019, which claims the benefit of priority to Japanese Patent Application No. 2018/241465, filed on Dec. 25, 2018. The entire contents of each of these applications are hereby incorporated herein by reference.
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Number | Date | Country | |
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Parent | PCT/JP2019/047910 | Dec 2019 | WO |
Child | 17332049 | US |