Patent Grant
11225818
The present application is based on Japanese patent application No. 2017-240047 filed on Dec. 14, 2017, the entire contents of which are incorporated herein by reference.
The invention relates to a door leading edge sensor that is attached to a door for opening/closing an opening portion provided in a vehicle such as a railway vehicle so as to detect a door pinch during the door closing operation.
When a person passes through a door opening portion provided in a vehicle etc., a door pinching may occur in which a part of the person's body and personal belongings are caught in the door during the door closing operation. A door pinch detection device for detecting such a door pinch has been proposed (e.g., see PTLs 1, 2)
The door pinch detecting device disclosed in PTL 1 is provided with a hollow portion having a circular cross section in the attachment portion of the door leading edge rubber attached to the leading edge of each door of the railway vehicle, and a cylindrical part in a cavity portion inside of the door leading edge rubber. The door pinch detection device is configured to detect a door pinching state by detecting the difference between the reference pressure data obtained from the hollow portion and the internal pressure data obtained from the cylindrical portion so as to judge the deformation state of the door leading edge rubber.
The door pinch detection device disclosed in PTL 2 is configured to detect the occurrence of door pinching by detecting a change in the amount of electric charge generated from a piezoelectric material disposed inside the door leading edge rubber when the door pinching occurs.
The door pinch detection device disclosed in PTL 1 operates such that the presence or absence of a door pinching is determined based on a change in the internal pressure of the cylindrical portion. Thus, the door pinch detection device may have a problem detecting a small foreign matter unless the small foreign matter is caught deeply since it has difficulty causing a deformation of the cylindrical portion. For example, an object such as a bag having a large contact area with the door leading edge rubber is easily detected, but an object such as fingers having a small contact area with the door leading edge rubber is not easily detected unless it is caught deeply.
The door pinch detection device disclosed in PTL 2 cannot detect whether or not the door pinching state is continuing since the door pinch is detected by a change in the amount of electric charge generated from the piezoelectric material after the door pinch occurs. For example, it may continue to erroneously recognize the door pinching state even if the contact state with the foreign object is released after the door pinching is detected by the crash of the foreign object against the door.
It is an object of the invention to provide a door leading edge sensor that is enabled to detect a door pinching state without depending on a contact area between the door leading edge rubber and the foreign object and that is enabled to determine whether or not the door pinching state is continued.
According to an embodiment of the invention, a door leading edge sensor defined below can be provided.
[1] A door leading edge sensor, comprising:
a door leading edge elastic member which is attached to a front end portion of a door in a door closing direction and in which a cavity extending in a direction intersecting with the closing direction is formed therein; and
a linear pressure sensitive sensor that is attached to the door leading edge elastic member and is disposed along the extending direction of the cavity,
wherein the pressure sensitive sensor has an insulator tube having such an elasticity as to be deformed in accordance with an elastic deformation of the door leading edge elastic member and plural of conductive members fixed to an inner surface of the insulator tube, and
wherein the plural of conductive members are in a non-contact state when the insulator tube is not deformed and are in contact with each other when the insulator tube is deformed.
[2] The door leading edge sensor according to [1], wherein the pressure sensitive member is attached to a side portion of the door leading edge elastic member except for both ends in an opening and closing direction of the door.
[3] The door leading edge sensor according to [2], wherein a pair of the pressure sensitive members sandwich a center plane in a thickness direction of the door parallel to the opening and closing direction of the door, and are attached to the side portions on one side and an other side of the center plane.
[4] The door leading edge sensor according to [3], wherein the pressure sensitive member is attached so that a center of the insulator tube is located closer to the closing direction side of the door than a reference line that is perpendicular to the center plane of the door and passes through a center of the cavity.
[5] The door leading edge sensor according to any one of [1] to [4], wherein a recess extending along the extending direction of the cavity is formed on an inner wall surface of the door leading edge elastic member, and at least a part of the pressure sensitive member is disposed in the recess.
[6] The door leading edge sensor according to any one of [1] to [5], wherein a part of the pressure sensitive member is exposed to the cavity.
[7] The door leading edge sensor according to any one of [1] to [6], wherein a rigid member harder than the door leading edge elastic member is attached to the door leading edge elastic member and the pressure sensitive member is attached closer to the closing direction side of the door than the hard member.
[8] The door leading edge sensor according to [7], wherein at least a part of the rigid member is accommodated in a concave portion formed in an inner wall surface of the door leading edge elastic member.
[9] The door leading edge sensor according to [7] or [8], wherein t the rigid member is disposed at a position exposed to the cavity.
[10] The door leading edge sensor according to any one of [7] to [9], wherein the rigid member is formed of a rod-shaped metal.
[11] The door leading edge sensor according to [4], wherein the pressure sensing member is disposed at a position where an angle between a straight line and the reference line is 10° to 30°, and wherein the straight line connects the center of the insulator tube and the center of the cavity.
[12] The door leading edge sensor according to [4], wherein the pressure sensing member is disposed at a position where an angle between a straight line and the reference line is 20° to 30°, and wherein the straight line connects the center of the insulator tube and the center of the cavity.
[13] The door leading edge sensor according to [1], wherein the door leading edge elastic member has a protrusion protruding toward the center of the cavity, and the pressure sensitive member is attached to an end of the protrusion in a projecting direction.
[14] The door leading edge sensor according to [1], wherein the door leading edge elastic member has plural of protrusions protruding toward the center of the cavity, and the pressure sensitive member is attached to a position sandwiched between the plural of protrusions.
According to an embodiment of the invention, a door leading edge sensor can be provided that is enabled to detect a door pinching state without depending on a contact area between the door leading edge rubber and the foreign object and that is enabled to determine whether or not the door pinching state is continued.
Next, the present invention will be explained in more detail in conjunction with appended drawings, wherein:
An embodiment of the invention will be described in conjunction the drawings. It should be noted that the same reference numerals are assigned to the constituent elements having substantially the same function, and the redundant explanations are omitted.
As shown in
Since the door leading edge rubber 4a, 4b attached to the right and left doors 2a, 2b have the same configuration, the door leading edge rubber 4a attached to the right door 2a will be described below. The door leading edge rubber 4a includes a mounting part 5 for mounting to the door 2a, an abutment part 6 disposed closer to the closing direction Bb side of the door than the mounting part 5, and a connecting part 5a connecting the mounting part 5 and the abutment part 6. The mounting part 5 is fitted into a mounting groove 3a provided at the distal end of the door 2a in the closing direction Bb. The abutment part 6 of the door 2a abuts on the abutment part 6 of the other door 2b when the door is closed. A cavity 7 extending in a direction intersecting the closing direction Bb is formed inside the abutment part 6. In the present embodiment, the extending direction of the cavity 7 is a vertical direction perpendicular to the opening and closing direction B of the door 2.
The cavity 7 is formed at a position including a center plane S in the opening and closing direction B of the door 2a and in a thickness direction of the door 2a bisecting a thickness direction W of the door 2a when the door leading edge rubber 4a is attached to the door 2a. In the example shown in
A code switch 10 as a linear pressure sensitive member arranged along an extension direction of the cavity 7 is attached to the door leading edge rubber 4a. Although the details of the configuration of the code switch 10 will be described later, the cord switch 10 has an insulator tube having elasticity which is deformed in accordance with elastic deformation of the door leading edge rubber 4a and plural of conductive members fixed to an inner face of the insulator tube. The plural of conductive members is in a non-contact state in a non-deformed state of the insulator tube, and are configured to contact each other when the insulator tube is deformed.
In
In this way, by arranging the code switch 10 on the door leading edge rubber 4 (4a, 4b), the door leading edge sensor 20 (20a, 20b) including the door leading edge rubber 4 (4a, 4b) and the code switch 10 is formed.
The door leading edge rubber 4a includes the mounting part 5, the abutment part 6, and the connecting part 5a connecting the mounting part 5 and the abutment part 6. The cavity 7 is provided on the center plane S in the thickness direction W (see
Herein, a mode of “a linear pressure sensitive sensor that is attached to the door leading edge elastic member and is disposed along an extending direction of the cavity” is not limited to a mode in which the pressure sensitive member is fixed by joining the cord switch 10 to the door leading edge rubber 4a, as in the first embodiment and the second embodiment to be described later. That mode includes a method of holding the cord switch 10 by plural of protrusions protruding toward the center of the cavity 7 as in a third embodiment to be described later. Also, that mode includes a mode in which the cord switch 10 is disposed on the surface of the protrusion so that the cord switch 10 is not fixed to the door leading edge rubber 4a by, e.g., adhesives or welding as in the fourth embodiment to be described later.
As shown in
Further, the code switch 10 is attached so that the center of the code switch 10 (the center of an insulator tube 11 described later) is located closer to the closing direction Bb side of the door 4a than a reference line M that is perpendicular to the center plane S of the door 4a and passes through the center C of the cavity 7. A preferable value of an angle (a mounting angle) θ formed by a straight line and the reference line M will be described based on a simulation result later, and wherein the straight line connecting the center of the code switch 10 and the center C of the cavity 7.
Cord Switch
Next, the code switch 10 will be described with reference to
As shown in
In the present embodiment, the outer surface 11b of the insulator tube 11 is cylindrical, and a hollow portion 11a having a cruciform cross sectional shape orthogonal to the longitudinal direction is formed at the center portion of the insulator tube 11. In an inner surface of the hollow portion 11a, a part of the four electrode wires 12 is exposed in the hollow portion 11a and is held spirally in an electrically non-contact state. The insulator tube 11 deforms when an external force is applied and has an elasticity (restorability) for restoring immediately as soon as an external force disappears.
As a material of the insulator tube 11 having such characteristics, a rubber material such as, e.g., silicone rubber, ethylene propylene rubber, or an elastic plastic such as, e.g., polyethylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene methyl methacrylate copolymer can be used.
The four electrode wires 12 have the same configuration. The four electrode fights 12 are arranged at equal intervals on the inner surface of the hollow portion 11a of the insulator tube 11 and are spirally arranged in the insulator tube 11. In the present embodiment, the four electrode wires 12 are held on the inner surface of the hollow portion 11a while being separated from each other (in a non-contact state) only by the elastic force of the insulator tube 11.
Although not shown, each of the electrode wires 12 is made up of plural of metal wires and a conductive coating layer having conductivity for collectively covering each of the plural of metal wires. Each of the electrode wires 12 has a circular cross section. This metal wire uses a metal stranded wire in which plural of metal strands is twisted together so as to obtain excellent bendability and elasticity. The conductive coating layer is, e.g., made of an admixture in which a conductive filler such as carbon black is compounded in rubber or elastic plastic. The cross sectional area of the conductive coating layer is preferably twice or more the cross sectional area of the metal wire. Thereby, enough elasticity is imparted to the electrode wire 12, and the electrode wire 12 is appropriately held by the insulator tube 11.
The code cover 13 is formed in a tubular shape, and accommodates the insulator tube 11 holding the electrode wire 12 in the hollow portion 11a to protect them. The cord cover 13 is made of, e.g., urethane rubber, EP rubber, silicone rubber, styrene butadiene rubber, chloroprene rubber, olefin or styrene type thermoplastic elastomer, urethane resin.
Generally, weak surveillance current is applied to this circuit, and when any one of the four electrode wires 12 comes into contact due to a load from the outside, a short-circuit current flows. This allows the circuit to detect anomalies based on an increase in short-circuit current.
Door Pinch Detection System
As shown in
The detecting device 22 is disposed, e.g., in the crew member's room. The detecting device 22 is preferably controlled so as to send a current to the door leading edge sensors 20a and 20b in a time division manner and to receive a detection signal in order to detect at which door the door pinching state has occurred. Further, an alarming device 24 is connected to the detecting device 22, and when the detecting device 22 detects occurrence of a door pinching state, the door where the door pinching state occurs may be displayed and the warning sound or light may be used to notify the door.
Effects of the First Embodiment
According to the door leading edge sensor 20 of the first embodiment, the following actions and effects are obtained.
(1) The cord switch 10 is arranged along the extending direction of the cavity 7, and the insulator tube 11 of the cord switch 10 is deformed in accordance with the elastic deformation of the door leading edge rubber 4a. As a result, since the plural of electrode wires 12 are brought into contact with each other, it is possible to detect the door pinching state without depending on the contact area between the door leading edge rubber 4a and the foreign matter.
(2) The code switch 10 sandwiches the center plane S of the door 2a and is provided at two positions on the inner wall surface on both sides in the thickness direction W of the door 2a in the door leading edge rubber 4a. As a result, it is possible to stably detect the door pinching state.
(3) In the cord switch 10, the plural of electrode wires 12 are in contact with each other as long as the elastic deformation of the door leading edge rubber 4a is continued due to pinching. As a result, it is possible to detect the door pinching state with a simple configuration only by detecting the ON/OFF thereof, and it is also possible to determine whether or not the door pinching state is continuing.
(4) Since a part of the code switch 10 is provided so as to be exposed in the cavity 7, the cord switch 10 is sandwiched between the corner portions (an edge portion of the recess 6a) of the door leading edge rubber 4a by the deformation of the abutment part 6 at the time of door pinching, and receives the pressure. As a result, it is possible to detect the door pinching state early.
(5) By adjusting the mounting angle θ of the cord switch 10, it is possible to adjust the load and the pushing amount for detecting the door pinching state.
In
The rigid member 18 is not particularly limited, but a material having a Young's modulus of ten times higher than that of the door leading edge rubber 4, e.g., a bar-shaped metal material such as a wire is preferable. If the hard member 18 is harder than the door leading edge rubber 4a, resin or rubber may be used. The concave portion 6b has a radius corresponding to the diameter (e.g., 2 mm) of the rigid member 18. The rigid member 18 is provided along the concave 6b. The rigid member 18 is joined to the concave portion 6b by, e.g., an adhesive, welding.
Effect of the Second Embodiment
According to the door leading edge sensor 20 of the second embodiment, the following actions and effects are obtained.
(1) Since the rigid member 18 which is harder than the door leading edge rubber 4a is attached closer to the opening direction Ba side of the door 2a than the cord switch 10, the rigidity of the door 2a in the opening direction Ba side is larger than that of the cord switch 10 and it is possible to detect the door pinching state with a small deformation amount and a small load as compared with the first embodiment.
(2) As in the first embodiment, by adjusting the mounting angle θ of the cord switch 10, it is possible to adjust the load and the pushing amount for detecting the door pinching state.
In the door leading edge sensor 20 according to the third embodiment, the door leading edge rubber 4 has plural of protrusions 41 protruding toward the center of the cavity 7, and the code switch 10 is mounted at a position where it is sandwiched by the plural of projections 41, 42. More specifically, the cord switch 10 is sandwiched between a pair of trapezoidal protrusions 41, 42, and is disposed at substantially the center of the cavity 7. The pair of projections 41, 42 is arranged in parallel along the opening and closing direction B of the door 2. The protrusion 41 is provided on the side of the code switch 10 in the closing direction Bb and the protrusion 42 is provided on the side of the code switch 10 in the opening direction Ba. The projections 41, 42 are provided over the entire longitudinal direction of the door leading edge rubber 4.
Effect of the Third Embodiment
According to the door leading edge sensor 20 of the third embodiment, it is possible to obtain the same actions and effects as those of the first embodiment. Further, when pinching occurs, the cord switch 10 is sandwiched between the protrusion 41 and the protrusion 42 arranged in the opening and closing direction B of the door 2, and the plural of electrode wires 12 come into contact with each other. As a result, compared with the first and second embodiments, it is possible to detect the door pinching state with a smaller amount of deformation and with a small load.
In the door leading edge sensor 20 according to the fourth embodiment, the door leading edge rubber 4 has a protrusion 42 protruding toward the center of the cavity 7 and the cord switch 10 is attached to the end portion of the projection 42 in the projecting direction. The protrusion 42 is provided on the opening direction side of the code switch 10 and protrudes toward the closing direction of the door 2. The door leading edge rubber 4 has a protrusion 41 having a protrusion amount smaller than that of the protrusion 42 on the closing direction side of the cord switch 10, and a gap is formed between the protrusion 41 and the code switch 10. That is, in the fourth embodiment, the cord switch 10 is not clamped by the pair of protrusions 41, 42, but protrusion 41 is smaller than the protrusion 42. With this configuration, the cord switch 10 is disposed at substantially the center of the cavity only by the projection 42.
In the door leading edge sensor 20 according to the fourth embodiment, when no pinch is occurring, the projection 41 does not abut the code switch 10. When the door pinch occurs, the protrusion 41 comes into contact with the code switch 10 and presses the cord switch 10 with the protrusion 42. As a result, the plural of electrode wires 12 of the cord switch 10 comes into contact with each other.
Effect of the Fourth Embodiment
According to the door leading edge sensor 20 of the fourth embodiment, the same operation and effect as those of the third embodiment can be obtained. Further, since a gap is formed between the protrusion 41 and the cord switch 10, the pain when, e.g., a finger is caught between the protrusion 41 and the code switch 10 is reduced as compared with the third embodiment.
Simulation Result on Mounting Position of Cord Switch
Hereinafter, results of various simulations on the position where the cord switch 10 is attached to the door leading edge rubber 4 will be described in detail.
In this simulation, when the cord switch 10 is attached to various positions of the door leading edge rubber 4 and a load is applied to the door leading edge rubber 4, the relationship between the load and the amount of deformation (pushing amount) of the door leading edge rubber 4a is examined in each case. More specifically, the relationship between the load and the amount of deformation (pushing amount) of the door leading edge rubber when the semicircular lower portion radius of a pressing member 40 is changed every 5 mm was investigated. As an analysis tool, ANSYS Mechanical (platform: ANSYS Workbench 14.5) of Cybernet Systems Inc. was used. The analysis model was ¼ model. The Young's modulus of the door leading edge rubber 4 was 3 MPa and the Poisson's ratio was 0.49. Assuming that the cord switch 10 is a general elastic body, the Young's modulus is 9 MPa and the Poisson's ratio is 0.49. This condition is the same in other simulations.
The abutment part 6 of the door leading edge rubber 4 has a circular cavity 7, and the upper portion thereof has a semicircular shape, in which the cord switch 10 is disposed. In addition, the pressing member 40 has a substantially rectangular parallelepiped shape, and a lower portion contacting the abutment part 6 of the door leading edge rubber 4 has a semicircular shape. The numbers written near each arrow in the figure mean the respective dimensions, and the units are all mm.
The base 30 has a length (a longitudinal direction of the door leading edge rubber 4) of 60 mm, a width (a width direction of the door leading edge rubber 4) of 21.6 mm, and a height of 12.5 mm. Further, the pressing member 40 has a depth of 30 mm and a height of 20 mm. The width of the pressing member 40 was varied to 10 mm (the radius of the semi-circular lower portion of the pressing member 40 means 5 mm), 20 mm (the radius of the semi-circular lower portion of the pressing member 40 is 10 mm), 30 mm (the radius of the semicircular lower part of the pressing member 40 is 15 mm), 40 mm (the radius of the semi-circular lower part of the pressing member 40 is 20 mm) and used.
Example 1 has a configuration corresponding to the third embodiment, in which the cord switch 10 is disposed substantially in the center of the cavity 7 by the support member. In the simulation conducted in Example 1, plural of support members for supporting the cord switch 10 are provided in the cavity 7 of the abutment part 6, and the cord switch 10 is disposed substantially at the center of the cavity 7. In this simulation, as shown in
In this simulation and the following simulation, the pressing member 40 pressed against the door leading edge rubber 4 while changing the load F. When the pressing member 40 pushes the upper end of the abutment part 6 of the door leading edge rubber 4 downward when the code switch 10 detects the occurrence of the door pinching state, the pushing amount with respect to the load F is obtained. The results are shown in Table 1.
According to Table 1, it can be seen that in Example 1, the code switch 10 detects the occurrence of the door pinching state with substantially the same pushing amount irrespective of the size of the pressing member 40. That is, it can be seen that Example 1 can detect the door pinching state without depending on the contact area between the door leading edge rubber and the foreign matter.
Example 2 corresponds to the fourth embodiment, in which the cord switch 10 is disposed on the surface of the end portion of the projection 42 in the projecting direction. That is, in Example 2, the protrusion 41 is made smaller than the protrusion 42 on the mounting part 5 side, so that the cord switch 10 is disposed substantially at the center of the cavity 7 only by the protrusion 42.
According to Table 2, in Example 2, it can be seen that the code switch 10 detects the occurrence of the door pinching state with substantially the same pushing amount irrespective of the size of the pressing member 40. That is, in Example 2, it is possible to detect the door pinching state without depending on the contact area between the door leading edge rubber 4 and the foreign matter.
In Example 3, the cord switch 10 is disposed on the side portion of the door leading edge rubber 4 corresponding to the first embodiment. Here, the code switch 10 is arranged within a range of ±40° with respect to a reference line M with reference to the center C of the cavity 7, wherein the reference line is perpendicular to the center plane S in the thickness direction W of the door and passes through the center C of the cavity 7.
In Example 3, the cord switch 10 may be disposed on the inner wall surface of the door leading edge rubber 4, but here, it is disposed at the center of the side portion of the inner wall surface of the door leading edge rubber 4. When the abutment part 6 is deformed by the load F, the side portion of the door leading edge rubber 4 is bent as shown in
According to Table 3, in Example 3, it is understood that the code switch 10 detects the occurrence of the door pinching state with substantially the same pushing amount regardless of the size of the pressing member 40. That is, in Example 3, it is possible to detect the door pinching state without depending on the contact area between the door leading edge rubber and the foreign matter.
In Example 4, the cord switch 10 and the rigid member 18 are arranged on the door leading edge rubber 4 corresponding to the second embodiment. That is, in Example 4, a rigid member whose hardness is harder than that of the door leading edge rubber 4 was disposed on the inner wall surface closer to the mounting part 5 than the cord switch 10 provided on the side portion of the inner wall surface of the door leading edge rubber 4. Here, the mounting angle θ of the cord switch 10 is set to 15°, and the angle α is set to 30°, wherein the angle α is formed by the straight line connecting the center of the code switch 10 and the center C of the cavity 7 and the straight line connecting the center of the rigid member 18 and the center C of the cavity 7.
According to Table 4, in Example 4, it is found that the code switch 10 detects the occurrence of the door pinching state with substantially the same pushing amount irrespective of the size of the pressing member 40. That is, in Example 4, it is possible to detect the door pinching state without depending on the contact area between the door leading edge rubber 4 and foreign matter.
Simulation Result 2 on the Mounting Position of the Cord Switch
The relationship between the pushing amount and the load at the time of detection of the door pinch in each Example was examined in comparison with the deformation behavior of the door leading edge rubber 4 without the cord switch 10. Here, the analysis tool and various conditions are the same as the simulation described above, except that the simulation was performed with the width of the pressing member 40 fixed at 10 mm.
Reference Example does not have the code switch 10. For the purpose of comparison with Examples 1-4, a simulation was conducted on the door leading edge rubber 4 not having the cord switch 10.
In the initial state of
In Example 1, simulation was performed in the same manner as in the Reference Example. When the load F reached 5.51 kgf, the code switch 10 detected the occurrence of the door pinching condition. The pushing amount V at this time is 3.33 mm. Note that the detection of the occurrence of the door pinching state is performed by simulation, and the same is applied to other simulations.
In this simulation, when the initial load F is 0.31 kgf, the pushing amount V is 0.41 mm. When the load F at the detection position P at which the code switch 10 detects the occurrence of the door pinching state is 5.51 kgf, the pushing amount V is 3.33 mm. Finally, when the load F reached 6.12 kgf, the pushing amount V was 3.56 mm.
In this way, when the cord switch 10 is sandwiched between the protrusions 41 and 42 and supported at substantially the center of the cavity 7, the pushing amount V is 3.33 mm (approximately 3.3 mm) with a load F of 5.51 kgf, and the pushing amount V with respect to the load F is small as compared with the Reference Example.
Simulation was performed on Example 2 by the same method as in the Reference Example. In Example 2, when the load F reached 6.12 kgf, the code switch 10 detected a door pinching state.
As described above, in the simulation of Example 2, the pushing amount V is increased as compared with the simulation of the Example 1, but the load F at which the cord switch 10 detects the door pinching state is not more than 6 kgf, which is larger than that in Example 1. That is, it is understood that the detection of the door pinching state is faster in Example 1 than Example 2.
Simulation was performed on Example 3 in the same manner as in Reference Example. When the load F reached 5.51 kgf, the cord switch 10 detected a door pinching state.
As described above, in the case of Example 3, when the code switch 10 detects the door pinching state, a larger pushing amount V can be obtained with a smaller load F as compared with the simulation result of Example 2. This is the result that the code switch 10 disposed at the position is easy to detect the door pinching state, wherein the position that the cord switch 10 is sandwiched by the bending of the side portion of the abutment part 6 and the deformation of the recess 6a provided on the inner wall surface of the door leading edge rubber 4. According to Example 3, while showing the behavior of the pushing amount V and the load F substantially similar to those of Reference Example, there is the merit that the door pinching state can be detected at a faster timing.
Simulation was performed on Example 4 by the same method as in Reference Example. When the load F reached 4.29 kgf and the pushing amount reached 5.08 mm, the code switch 10 detected a door pinching state.
Mounting Angle of the Cord Switch
A simulation for exploring the optimum mounting angle by slightly shifting the attachment position of the code switch 10 was performed for Example 3.
As can be seen from
As described above, when the rigid member 18 is disposed closer to the mounting part 5 side than the arrangement position of the cord switch 10, both the pushing amount V and the load F in operation are similarly reduced to 10° as the mounting angle θ increases from −10°. However, when the mounting angle θ exceeds 20°, the decrease in the pushing amount V is suddenly reduced.
Regarding the mounting angle θ of the cord switch 10, in Example 3 in which the rigid member 18 is not provided, the angle is preferably 10° to 30°. In Example 4 in which the rigid member 18 is provided, the mounting angle θ is preferably 20° to 30°.
Although the embodiment of the present invention described above, the present invention is not limited to only these embodiments. The present invention can be modified in various ways without departing from the spirit of the present invention. For example, in each of the above-described embodiments, a case where a door leading edge sensor is applied to a train door described, but the door leading edge sensor of the present invention is applied to other doors such as a door provided at the home of a train, a sliding door of a vehicle such as an automobile, a door of an elevator, a door provided at the entrance of a building such as a building.
Further, in each of the above-described embodiments, the case where the door leading edge sensor is applied to a pair of doors where the front end portion of the door in the closing direction faces is described, but the door leading edge sensor may be applied to a single door that does not have opposed doors. For example, in the case of a train, it is also applicable to a vehicle with a single-door door.
Further, it is not necessary to provide the code switch over the entire length of the door leading edge sensor, but it may be formed only in a part of the entire length of the door leading edge sensor.
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