This invention in its several and varied embodiments regards chainsaw technology.
Chainsaws suffer from problems associated with bulky size, high weight and inadequate dependability, as well as from poor efficiency in maintenance and difficulties in use. Chainsaws have chain covers which are large, bulky and which prevent an operator from making saw cuts close to a fixed object, such as close to the ground, or a tree trunk, or another fixed surface. Additionally, an operator can overtighten a chain bar which can result in deforming the chain bar, equipment damage, shortened tool life and/or pinching of the chain. Chainsaws further suffer from inadequate tensioning systems which increase chainsaw size and are inaccurate to operate. Chainsaw oil caps leak, can be lost, are clumsy to operate and add to chainsaw bulk and size problems.
Applicant's invention in its several and varied embodiments significantly improves the technology of chainsaws. In an embodiment, a chain bar clutch system for a chainsaw can have a chainsaw housing with a motor therein. A chain bar can be secured to the chainsaw housing and operatively connected to the motor. A chain cover can be used to secure the chain bar to the chainsaw housing. A clutch system can be used to control the force exerted by the chain cover against the chain bar.
In an embodiment, the clutch system can have a clutch plate that urges the chain cover against the chain bar. The clutch plate is capable of slipping to prevent overtightening of the chain bar. The clutch system can also have a tightening knob engaging the clutch plate, the tightening knob can rotate the clutch plate in a first direction to tighten the chain cover against the chain bar when the force applied to the chain bar is below a predetermined level, and the tightening knob can experience slipping with respect to the clutch plate when the force applied to the chain bar is at or above the predetermined level.
In an embodiment, a chain bar tightening clutch system for a chainsaw can have a clutch having a tightening state and a clutch state (or “clutched state”). When in the tightening state, the clutch can communicate a force to at least a portion of a chain cover and can move the chain cover to impart a pressing force to at least a portion of a chain bar. When in the tightening state, the clutch can communicate an increasing force to the at least a portion of chain cover until the clutch state is activated. When the clutch state is activated, the clutch can free at least a portion of the chain cover from receiving an additional force from the clutch.
In another embodiment, when in a tightening state, the clutch, or a portion of the clutch mechanism, can communicate a force to at least a portion of a chain bar. When in the tightening state, the clutch can communicate an increasing force to at least a portion of the chain bar until the clutch state is activated. When the clutch state is activated, the clutch frees at least a portion of the chain bar from receiving additional force from the clutch.
The bar tightening knob can engage the clutch plate and can impart a force to the clutch plate by means of one or more of a projecting member. In an embodiment, the projecting member can be a clutch tooth, or a plurality of clutch teeth. In an embodiment, the clutch plate can have pawls having an inclined face, the tightening knob can have teeth which each can have a corresponding inclined face that can engage respective pawl inclined faces, such that when the predetermined force level is reached, the pawl inclined face and teeth inclined face can rotate past one another.
The clutch plate can have a flexible member which is adapted to be moved by one or more of the projecting member. The flexible member activating a clutch condition when the one or more of the projecting member has a deflection angle of 5°, or greater. The projecting member is a clutch tooth and the flexible member is a spring finger. The chain bar tightening clutch system can have a clutch plate which can have a plurality of a spring finger which clutches when one or more of the spring finger has a deflection angle of 5°, or greater.
The chain bar clutch system can have a tightening knob which can be rotated in a second direction, opposite of a first direction, such that the clutch plate loosens the force exerted by the chain cover against the chain bar. The chain bar clutch system can have a bar tightening bolt extending from the chainsaw housing through a groove in the chain bar to engage the tightening knob. The clutch plate connector can be reversibly engaged with the bar tightening bolt such that when the clutch is in the tightening state, rotating the bar tightening knob in a tightening direction can rotate the clutch plate in a tightening direction and rotate the clutch plate connector in a tightening direction. In an embodiment, the chain bar tightening clutch system can have a threaded portion configured to be screwed onto a plurality of bolt threads of a bar tightening bolt, the threaded portion being screwed further onto the bar tightening bolt when the clutch system is not in a clutch state.
Rotating the clutch plate connector in a tightening direction can cause the clutch plate connector to move along the bar tightening bolt length toward a chain bar backstop; and when the clutch plate connector moves toward the chain bar backstop, the clutch plate imparts a force to at least a portion of a chain cover moving the chain cover toward at least a portion of the chain bar.
A bar tightening knob for a chainsaw can have a tightening knob body and a clutch. The bar tightening knob body can have a member configured to impart a force to a clutch plate. The clutch plate can be configured to reversibly engage with a bar tightening bolt. The chain cover can optionally have a clutch plate retention means.
When the clutch is in the tightening state, at least a portion of the chain cover can receive a force imparted by the clutch plate which can force at least a portion of the chain cover to exert a compressive force against at least a portion of the chain bar. When the clutch is in the tightening state the clutch plate can receive a torque in a range of 5 in-lbf to 150 in-lbf causing tightening to occur. Regarding clutching, which stops increased tightening, the clutch can have a clutch set point which is set to a torque of 10 in-lbf or greater. In another embodiment, clutching can occur at a torque of 15 in-lbf or greater. While tightening torques up to 150 in-lbf, or more may be desired in some uses, the clutch set point can be set at a desired torque at which the clutch will free the chain bar from experiencing greater tightening.
In an embodiment, the bar tightening knob can be adapted to have a recessed knob height which is less than a chain cover height. The tightening knob can have a tightening knob handle which is adapted to be recessed to a location of height at or below the chain cover height. Optionally, the chain cover has a chain cover height of 20 mm or less.
In an embodiment, a chain bar tightening clutch system can have a bar tightening knob which when turned can provide a driving force to a clutch plate. The clutch plate can impart a force which acts upon a chain bar contact portion. The chain bar contact portion can be adapted to impart a tightening force to at least a portion of a chain bar. The chain bar contact portion can impart a tightening force to at least a portion of a surface of a chain bar.
A chain bar tightening knob can comprise a clutch. The chain bar tightening knob can have a clutch plate. In an embodiment, the chain bar tightening knob can provide a driving force to a plurality clutch teeth which can engage and provide a driving force to at least a portion of the clutch plate when the bar tightening knob is turned. When in a tightening state, the plurality of clutch teeth can impart a force upon the clutch plate which can result in the radial movement of the clutch plate. When in a clutch state, the plurality of clutch teeth can impart a force upon the clutch plate which is sufficient to result in a clutching. In the clutch state, the force on the clutch plate does not result in radial movement of the clutch plate.
The chain bar tightening knob can have a chain bar tightening knob handle which can be pivoted to achieve a recessed state.
In an embodiment, a method of positioning a chain bar on a chainsaw can have the steps of: securing a chain bar to a chainsaw housing; positioning a chain cover over at least a portion of the chain bar so that the chain bar is located between the chain cover and the chainsaw housing; and providing a clutch system for applying a force against at least a portion of a chain bar, the force being limited by the clutch system.
The method of positioning a chain bar can use a clutch system which has a tightening knob, as well as the additional steps of: rotating the tightening knob in a first direction to increase the force applied to the chain bar; and communicating the force by at least a portion of the chain cover to the chain bar. Optionally, the method can use a clutch system which has a clutch plate having pawls with an inclined face, and the tightening knob can have corresponding teeth to the pawls. In an embodiment, the teeth can respectively have an inclined face, so that when the tightening knob is rotated in the first direction and a predetermined force level is reached, the clutching system is activated and the pawls rotate past the teeth.
In another embodiment, a method of chain bar positioning can have the steps of: applying a force against at least a portion of a chain bar; the force being limited by a clutch mechanism; and the force securing the at least a first portion of the chain bar at a location between at least a portion of a chain bar backstop and at least a portion of a chain cover. The method of chain bar positioning can further use the step of communicating the force by at least a portion of the chain cover to the chain bar. The method can also use the step of pressing at least a portion of the chain cover against at least a portion of the chain bar. Additionally, the method can use the step of communicating the force by at least a portion of the clutch mechanism to the chain bar. Optionally, the method of chain bar positioning can use the step of communicating the force by at least a portion of the clutch plate connector to the chain bar.
In an embodiment, method of chain bar positioning can activate the clutch to free the chain bar from receiving a tightening or pressing force above a torque of 20 in-lbf. In another embodiment, the method can activate the clutch to free a chain bar tightening knob to turn without imparting a tightening or pressing force above a torque of 20 in-lbf to the chain bar.
In an embodiment, the method can position the chain bar at the location between at least a portion of an oil feed to the chain bar and at least a portion of the chain cover. The chain bar can be located between at least a portion of a source of oil feed and at least a portion of the clutch mechanism. Optionally, the method of chain bar positioning can position the chain bar at a location which is between at least a portion of a source of oil feed and at least a portion of a clutch plate connector.
In an embodiment, a method for tightening a chain bar can have the steps of: applying a force to at least a portion of a chain bar; and the force communicated from a clutch mechanism to the at least a portion of a chain bar. The method for tightening a chain can further comprise the step of having the bar tightening knob communicate a first force to the clutch mechanism which communicates the force the clutch mechanism to the at least a portion of a chain bar when the clutch mechanism is in a tightening state.
The method for tightening a chain bar can further use a bar tightening knob which can communicate a first force to the clutch mechanism when in a tightening state, and which does not communicate the force to the at least a portion of a chain bar when the clutch mechanism is in a clutch state. The method for tightening a chain bar can also use the steps of providing the clutch mechanism having a clutch plate; and using the clutch plate to communicate the force to the at least a portion of a chain bar.
In an embodiment, the method can further comprise the step of providing a bar tightening knob having at least a portion of a clutch mechanism. The method can use a chain cover having at least a portion of a clutch mechanism. The method for tightening a chain bar can have the step of providing a chain cover having at least a portion of a bar tightening knob and at least a portion of a clutch mechanism.
In an embodiment, the method for tightening a chain bar can use the step of applying the force by pressing at least a portion of the chain cover against the at least a portion of a chain bar. In another embodiment, the method for tightening a chain bar can directly communicate at least a portion of the force from at least a portion of the chain cover to the at least a portion of a chain bar. In yet another embodiment, the method for tightening a chain bar can have the further step of indirectly communicating at least a portion of the force from at least a portion of the chain cover to the at least a portion of a chain bar.
In an embodiment, the method for securing a chain bar can apply a force to at least a portion of a chain bar, which force can be communicated from a clutch mechanism to the at least a portion of a chain bar. Additionally, the method for tightening a chain bar can have the steps of: providing the clutch mechanism having a connecting member adapted to screw onto a tensioning post; screwing the connecting member onto the tensioning post; and the clutch limiting application of the force to at least a portion of a chain bar.
In an embodiment, a chainsaw can have a chain bar tensioning system which can have an offset member configured to position a tensioning post. The offset member can be guided by a tensioning guide and driven by a tensioning drive member adapted to drive a movement of the offset member. The tensioning drive member can be located at an offset distance from the guide bar. In an embodiment, the tensioning drive member can have a tensioning shaft which is adapted to drive a movement of the offset member. In another embodiment, the tensioning drive member can have a rack and pinion adapted to drive a movement of the offset member.
In an embodiment, the tensioning guide can have a guide bar and an offset distance between the tensioning drive member and the guide bar. For nonlimiting example, the offset distance can have a value in a range of from 0.25 in to 5.0 in, or greater. In an embodiment, the offset distance can be a proximal offset distance having a value in a range of from 0.25 in to 5.0 in, or greater. In an embodiment, the offset distance can be a centerline offset distance having a value in a range of from 0.25 in to 5.0 in, or greater.
The chain bar tensioning system can have a tensioning post which can project from the offset member and which can have a travel distance of 0.25 in, or greater, or a value in a range of from 0.25 in to 4 in. The chain bar tensioning system can also have a tensioning drive member adapted to impart a torque to the tensioning post in a range of 1.0 in-lbf to 50 in-lbf.
In an embodiment, the chainsaw can have an oil cap having an oil cap body which can have at least one lock channel. Optionally, the lock channel can have one or more of a detent which can reversibly allow clearance for a locking member's motion across a respective detent. In an embodiment, the oil cap can generate a sound when an operator moves the oil cap into a locked position. In an embodiment, the movement of an adapter post across a detent into the channel cavity can generate a sound greater than 30 dB, or in a range of from 30 dB to 80 dB, such as 30 dB, or 40 dB, or 50 dB, or 60 dB, or 80 dB. In an embodiment, the detent can move out of a resting position adjacent to an adapter post of an oil reservoir. The lock channel can also have a detent clearance which is less than a channel mouth dimension. The detent can optionally fowl part of a channel cavity into which the adapter post can be reversibly secured.
The present invention in its several aspects and embodiments solves the problems discussed above and significantly advances the technology of chainsaws. The present invention can become more fully understood from the detailed description and the accompanying drawings, wherein:
FIG. 13B1 is a front view of an oil bottle adapter;
FIG. 14D1 is a close up of a first embodiment of a lock channel;
FIG. 14D2 is a side view of a second embodiment of a lock channel;
Herein, like reference numbers in one figure refer to like reference numbers in another figure.
The chainsaw technologies disclosed herein are compact, reliable, easy to operate and efficient to maintain. For example, a chain bar tightening clutch system can use a compact and reliable bar tightening knob, a low profile chain cover can allow a chainsaw operator to make cuts close to a fixed obstacle and a chain bar tensioning system provides a new compact method for positioning a tensioning post to achieve a chain tension. An oil cap is also disclosed which has a lock channel, provides ease of operator use, has a leak-free closure and produces a sound as an audible indication of when the oil cap transitioned from an unlocked state to a locked state.
Chainsaw and Chainsaw Systems (E.g.
The cordless chainsaw 2 can have a rear handle 20 and a forward handle 30 each configured to be gripped by an operator's hand. A trigger assembly 50 can have a trigger 60 and an actuator 70 which can trigger the motor 6 to rotate and drive a transmission assembly 100 which can turn a sprocket 230 (
The chain 250 can be configured to slideably move along the chain guide groove 220 and can have a chain tension provided at least in part by a chain bar tensioning system 300. The chain bar tensioning system 300 can have a tensioning post 310 (
Referring to
In an embodiment, the bar tightening bolt 150 has a bolt threads 152 portion which project beyond the chain bar first surface 260 toward a clutch plate connector 511 which can be screwed onto the bolt threads 152. The chain bar 200 can be configured to have an oil seal system 880 which can provide a chain oil to the chain 250 by means of flowing the chain oil through an oil port 885 and through the body of the chain bar 200. In an embodiment the chain bar 200 can have one or more internal passages positioned in communication with the oil port 885 and the chain guide groove 220, which are located inside of the chain bar 200 between at least a portion of the chain bar first surface 260 and a portion of the chain bar second surface 265 and which provide oil to the chain 250.
A first oil seal portion 890 can be pressed against a portion of the chain bar first surface 260 and over the oil port 885. For example, the first oil seal portion 890 can seal the chain bar oil inlet port 897 which passes through the chain bar first surface 260 and chain bar second surface 265. The sealing of the chain bar oil inlet port 897 on the chain bar first surface 260 while allowing the chain bar oil inlet port 897 to receive oil from the oil port 885 through the chain bar second surface 265 allows oil to pass through the one or more internal passages to the chain guide groove 220 and to the chain 250. Optionally, the first oil seal portion 890 can be a separate sealing member or can be an integral portion of the low profile chain cover 650.
The low profile chain cover 650 can be configured such that at least a portion of the bar tightening bolt 150 and the bolt threads 152 project through a bolt opening 651 and into the clutch cavity 653 of the bar tightening port 17. In an embodiment, the clutch plate 510 can be rotatably affixed to the bar tightening bolt 150 by means of affixing the clutch plate 510 to the clutch plate connector 511 and affixing the clutch plate connector 511 to the bar tightening bolt 150. In an embodiment, the clutch plate connector 511 can be screwed onto the bar tightening bolt 150 to provide a tightening force to position the chain bar 200, as well as can be unscrewed and removed from the bar tightening bolt 150 to allow for positioning, maintenance or removal of the chain bar 200.
Optionally, the clutch plate connector 511 can be an integral part of the clutch plate 510. The clutch plate connector 511 can be attached to the bar tightening bolt 150 by a broad variety of means such as, but not limited to, a frictional fit, a lock and key, a connecting system or screw threads. Optionally, the clutch plate 510 can be insert molded onto the clutch plate connector 511 which can form one integral part as shown in the example of
The bar tightening knob 600 can continue to be turned by an operator to reach a clutch set point at which the chain bar 200 is frictionally secured between at least a portion of the low profile chain cover 650 and the chain bar backstop 1991 with a desired force, which can be the clutch set point after which the clutch can activate to an active clutch state. In an embodiment, if the operator turns the bar tightening knob 600 to impart a force greater than the clutch set point, then the clutch plate 510 will clutch and the active clutching will allow the bar tightening knob 600 to turn without further tightening of the chain bar 200. In an embodiment, when a clutch force is reached, an active clutch state can occur and the clutching can avoid the part or portion of the chain bar tightening system 300 from imparting undesired and/or excess force and can avoid overtightening upon the chain bar 200.
In an embodiment, a portion of the chain cover 645 can contact a portion of the chain bar 200 and impart a tightening force. Optionally, a member which is not the chain cover 645 can be used to contact the chain and/or impart a tightening force. For example, a part or portion of the chain bar tightening system 300, such as the clutch plate connector 511, or other member, or interface, could impart force against the chain bar 200.
The example of
In an example of operation, the chain bar tightening clutch system 500 can be used to impart a limited force which presses upon the chain bar 200 to establish a preliminarily position the chain bar 200 desired by an operator relative to the sprocket 230. Then, the operator can use chain bar tensioning system 300 to finalize the position of the chain bar 200. In an embodiment, when the operator has established a preliminary position for the chain bar 200, the operator can then use chain bar tensioning system 300 to move the chain bar toward or away from the sprocket 230 as desired to achieve a final position of the chain bar 200. After that, the operator can use the chain bar tightening clutch system 500 can be used to achieve a final tightening of the low profile chain cover 650 and the chain bar backstop 1991 against the chain bar 200.
Optionally, the operator can use chain bar tensioning system 300 concurrently with the chain bar tightening clutch system 500 to achieve a final tightening of the low profile chain cover 650 and the chain bar backstop 1991 against the chain bar 200 at a desired chain bar position. As another option, the operator can use chain bar tensioning system 300 concurrently with the chain bar tightening clutch system 500 separately, or in sequence to achieve a desired tightening and chain bar 200 position. In yet another option, the operator can use the use chain bar tensioning system 300 concurrently with the chain bar tightening clutch system 500 iteratively or in a desired sequence or cycle to secure the chain bar 200 in a desired position at a desired tightness.
In an embodiment, the desired tightness is set by the clutching of the clutch plate and can be a tightness set by a manufacturer. Thus, the tightness imparted upon the chain bar 200 by the chain bar tightening clutch system 500 can be a set value. This can be any value to which the clutch is designed to activate.
In another example of operation, the chain bar tensioning system 300 can be used to position the chain bar 200 relative to the sprocket 230, and then the chain bar tightening clutch system 500 can be used to achieve a desired tightening of the low profile chain cover 650 and the chain bar backstop 1991 against the chain bar 200.
In an embodiment, the chain bar tensioning system 300 and the chain bar tightening clutch system 500 can be operated independently of one another. In another embodiment, the chain bar tensioning system 300 and the chain bar tightening clutch system 500 can be operated concurrently.
Numeric values and ranges herein, unless otherwise stated, are intended to have associated with them a tolerance and to account for variances of design and manufacturing. Thus, a number is intended to include values “about” that number. For example, a value X is also intended to be understood as “about X”. Likewise, a range of Y-Z, is also intended to be understood as within a range of from “about Y-about Z”. Unless otherwise stated, significant digits disclosed for a number are not intended to make the number an exact limiting value. Variance and tolerance is inherent in mechanical design and the numbers disclosed herein are intended to be construed to allow for such factors (in non-limiting e.g., ±10 percent of a given value). Example numbers disclosed within ranges are intended also to disclose sub-ranges within a broader range which have an example number as an endpoint. A disclosure of any two example numbers which are within a broader range is also intended herein to disclose a range between such example numbers. When a series of example numbers are disclosed, unless otherwise stated, numbers between such example numbers are also intended to be disclosed. The claims are likewise to be broadly construed regarding their recitations of numbers and ranges.
The clutch plate 510 can also be rotated in a release direction 1630 which unscrews the clutch plate connecter 511 from the bar tightening bolt 150 and loosens the pressure from the chain bar 200. Optionally, the clutch plate connector can be unscrewed from the from the bar tightening bolt 150 to allow removal of the chain bar tightening clutch system 500 and chain cover 645 from the cordless chainsaw 2.
The clutch plate 510 and/or the spring finger 520, or any other portion, can be made at least in part or wholly of a metal, a polymer, a plastic, a reinforced polymer, a reinforced plastic, a ceramic, a cured resin, a thermoplastic or other material suitable for the uses described herein. In an embodiment, the clutch plate 510 and/or the spring finger 520 can be made at least in part of a 15% glass fiber reinforced, heat stabilized, black polyamide 6 resin for injection molding, such as Zytel® 73G15HSL BK363 (E.I. DuPont de Nemours & Co., 1007 Market St Wilmington, Del., 19898 United States (302) 774-1000). The clutch plate 510 and/or the spring finger 520 can optionally be made at least in part of a carbon fiber reinforced polymer. The percent of material reinforcement can vary widely to satisfy the uses disclosed herein.
Optionally, the bar tightening knob 600 can bear symbols or markings which an operator can view and/or feel during use of the bar tightening knob 600. In nonlimiting example, the bar tightening knob 600 can have an unlocked symbol 630 adjacent to a directional arrow symbol 631 with an arrowhead pointing the direction of rotation to unlock the bar tightening knob 600. The bar tightening knob 600 can have a locked symbol 632 adjacent to a directional arrow symbol 631 with an arrowhead pointing the direction of rotation to lock the bar tightening knob 600. Optionally, the tightening knob handle 610 can have on or more of a handle slot 621 which the operator can feel when touching the tightening knob handle 610. The number of the handle slot 621 provides a visual and tactile indication of which portion of the knob is the tightening knob handle 610 portion, as well as providing a gripping surface when turning and/or rotating the tightening knob handle 610.
In an embodiment, the bar tightening knob 600 can be turned in a tightening direction 1632 which can screw the clutch plate connector 511 onto the bolt threads 152. This can tighten the clutch plate 510 against the chain cover 645 which can press against at least a portion of the chain bar 200, such as the chain bar first surface 260. In an embodiment, the clutch plate connector 511 can press against at least a portion of the chain bar 200, such as the chain bar first surface 260.
In an embodiment, the bar tightening knob 600 can be rotated in a release direction 1630. Rotating the bar tightening knob 600 in a release direction 1630 can cause the inner clutch teeth 561 and the outer clutch teeth 571 (
In an embodiment, multiple clutch teeth 500 can force multiple pawls 526 to move and turn the clutch plate 510 such that the clutch plate connector 511 unscrews from the bolt threads 152 of the bar tightening bolt 150. Optionally, the bar tightening clutch assembly 505 can be unscrewed from the bar tightening bolt 150 until it is free of connection to the bar tightening bolt 150. The freeing of the bar tightening clutch assembly 505 from connection to the bar tightening bolt 150 can achieve the removal of the chain cover 645 from the cordless chainsaw 2.
In an embodiment, the bar tightening knob 600 can be configured such that the bar tightening knob handle 610 and knob surface 606 are each located between a chain cover surface 660 (
Thus, in a tightened state the tightening knob face height 1200 can be measured either from the chain cover bar face 1201 or the chain bar first surface 260 to the chain cover surface 660. When the chain cover 645 is removed from the cordless chainsaw 2, the tightening knob face height 1200 can be measured the chain cover bar face 1201 to the chain cover surface 660.
In an embodiment, together the bar tightening knob handle 610 when in its recessed state as shown in
In an embodiment, a pawl angle 1523 can be the same or different than the tooth angle. The pawl angle 1523 can have an angle equal to or greater than 90°, or in a range of 90° to 160°, or 90° to 125°, or 90° to 110°, or 90° to 105°, such as 95°, 105°, 110° or 125°, or greater. In an embodiment the pawl angle 1523 is different from the tooth angle 1529. In nonlimiting example, the pawl angle 1523 can be 120°, or 125°.
The deflection angle 539 can range from zero when the spring finger 520 is at a resting state to a maximum value which allows the clutch tooth tip 553 and the pawl tip 528 to clear and pass one another. For example, the deflection angle 539 can have a value in the range from 0° to 75°, or 0° to 66°, or 0° to 33°, or 0° to 15°, or 0° to 10°, or 0° to 5°, or 0° to 3°, such as 2°, 3°, 7°, 10°, or 15°, or greater.
The deflection angle 539 can correspond to a deflection distance 537. The deflection distance can be the distance between the spring centerline plane and the spring finger center line 531. The deflection distance 537 can range from zero when the spring finger 520 is at a resting state to a maximum value which allows the clutch tooth tip 553 and the pawl tip 528 to clear and pass one another. For example, the deflection distance 537 of a spring finger can have a value in the range from 0 mm to 150 mm, or greater, such as or 0 mm to 10 mm, or 0.5 mm to 5 mm, or 0 mm to 3 mm, or 0 mm to 2 mm. In nonlimiting example, the deflection distance 537 can have a value of 0.75 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 7 mm, 10 mm, or greater.
In an embodiment, the clutch can engage and allow one or more of a clutch tooth 551 to clear the pawl 526 at a torque in a range of 10 in-lbf to 150 in-lbf, or 10 in-lbf to 50 in-lbf, or 25 in-lbf to 35 in-lbf, or 20 in-lbf to 40 in-lbf, or 50 in-lbf to 75 in-lbf, or 50 in-lbf to 100 in-lbf, such as 10 in-lbf, or 15 in-lbf, or 25 in-lbf, or 50 in-lbf, or 75 in-lbf. In an embodiment, the clutch set point can result in clutch action when the torque exceeds a clutch set point which prevents overtightening of a portion of the tensioning system or chain cover against the chain bar and/or of the chain bar against the chain bar backstop 1991.
In an embodiment, the bar tightening clutch system assembly 505 can be removable from the chainsaw to allow replacement, positioning or maintenance of the chain bar 200. In another embodiment, tightening clutch system assembly 505 can be loosened to allow for positioning or maintenance of the chain bar 200.
In the embodiment shown in
The tightening of the low profile chain cover 650 achieves a chain cover height 1000 which has a low profile, such as in a range of 0.25 in to 3.0 in, such as or 0.5, 0.75 in, 1.0 in, 1.25 in, 1.5 in, 1.75 in, 2.0 in or 2.5 in. In an embodiment, the chain cover height 1000 can be in a range of from 5 mm to 100 mm, such as 10 mm, 15 mm, 20 mm, 25 mm, 50 mm, or 75 mm.
The bar tightening clutch system assembly 505 in an assembled state can have a tightening knob face height 1200 of equal to or less than the chain cover height 1000. For example, the knob face height 1200 can be in a range from 0.25 in to 3.0 in, such as 0.5 in, 0.75 in, 1.0 in, 1.25 in, 1.5 in, 1.75 in, 2.0 in or 2.5 in. The knob face height 1200 can be in a range of from 5 mm to 100 mm, such as 10 mm, 15 mm, 20 mm, 25 mm, 50 mm, or 75 mm.
The bar tightening clutch system assembly 505, in an assembled state, can have a clutch place face 613 having a clutch face place height 1100 of equal to or less than the knob face height 1200. In an embodiment, the clutch face height 1100 can be in a range of from 0.25 in to 3.0 in, such as or 0.5 in, 0.75 in, 1.0 in, 1.25 in, 1.5 in, 1.75 in, 2.0 in or 2.5 in. In an embodiment, the clutch face height 1100 can be in a range of from 5 mm to 100 mm, such as 10 mm, 15 mm, 20 mm, 25 mm, 50 mm, or 75 mm.
In an embodiment, the chain cover height 1000 can be in a range of 0.25 in to 2.0 in, or less; the knob face height 1200 can be in a range of from 0.25 in to 1.75 in, or less; and the clutch face height 1100 can be in a range of 0.25 in 1.5 in, or less. In another embodiment, the chain cover height 1000 can be in a range of 0.25 in to 1.5 in, or less; the knob face height 1200 can be in a range of 0.25 in to 1.25 in, or less; and the clutch face height 1100 can be in a range of 0.25 in to 1.0 in, or less. In yet another embodiment, the chain cover height 1000 can be in a range of 0.25 in to 1.25 in, or less; the knob face height 1200 can be in a range of 0.25 in to 0.75 in, or less; and the clutch face height 1100 can be in a range of 0.25 in to 0.5 in, or less.
In an embodiment, the ratio of the chain cover height 1000 to the knob face height 1200 is in a range of 1:1 to 2:1, or 1:1 to 3:1, or 1:1 to 4:1.
The use of the offset member 370 achieves a compactness of design of the chain bar tensioning system 300 by allowing the tensioning shaft 380 to be configured adjacent to a portion of the drum 810. The tensioning shaft 380 can be driven by rotating chain tensioning knob 400 in either direction as shown by tensioning arrow 1401 (e.g. clockwise or counterclockwise).
In an embodiment, the offset guide bar 360 can have an offset guide centerline 365. The tensioning shaft 380 can have a tensioning shaft centerline 385. In an embodiment, the offset guide centerline 365 can be configured at a distance from the tensioning shaft centerline 385 which can be a centerline offset 374. In an embodiment, the centerline offset 374 can have a value in a range of 0.1 in to 4 in, or 2.0 in to 3.5 in, or 1.0 in to 2.5 in, or 1.0 in to 2.0 in, or 0.5 in to 1.5 in, or 0.25 in to 1.0 in; such as 0.25 in, or 0.5 in, or 1.0 in, or 1.5 in, or 2.0 in, or 2.5 in, or 3.0 in, or 3.5 in. In another embodiment, the centerline offset 374 can have a value in a range of 3 mm to 100, or 50 mm to 75 mm, or 25 mm to 50 mm, or 15 mm to 40 mm, or 10 mm to 30 mm, or less.
Optionally, the chain tensioning knob 400 can be subflush to chain cover surface 660. In an embodiment, the chain tensioning knob can also have a pivotable handle portion which can be recessed into the tensioning knob port 19.
As shown in
The offset guide bar 360 can have an offset guide diameter 361, an offset guide distal tangent 361 and an offset guide proximal tangent 364. The tensioning shaft 381 can have a tensioning shaft diameter 381, a tensioning shaft distal tangent 383 and a tensioning shaft proximal tangent 384.
The chain bar tensioning system 300 can have a distal offset 373 which can be the distance between the offset guide distal tangent 361 and the tensioning shaft distal tangent 383. In an embodiment, the distal offset 373 can have a value in a range of 0.25 in to 6 in, or 0.25 in to 2.0 in, or 0.25 in to 1.75 in, or 0.25 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.75 in, or 0.25 in to 0.5 in, or 0.25 in to 0.4 in. In another embodiment, the distal offset 373 can have a value in a range of 5 mm to 100 mm, or 10 mm to 75 mm, or 10 mm to 50 mm, or 15 mm to 35 mm, 15 mm to 30 mm, 10 mm to 20 mm, or 5 mm to 15 mm, or 5 mm to 10 mm, or less.
The chain bar tensioning system 300 can have a proximal offset 372 which can be the distance between the offset guide proximal tangent 364 and the tensioning shaft proximal tangent 384. In an embodiment, the proximal offset 372 can have a value in a range of 0.25 in to 6 in, or 0.25 in to 2.0 in, or 0.25 in to 1.75 in, or 0.25 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.75 in, or 0.25 in to 0.5 in, or 0.25 in to 0.4 in. In another embodiment, the proximal offset 372 can have a value in a range of 5 mm to 100 mm, or 25 mm to 75 mm, or 10 mm to 50 mm, or 10 mm to 35 mm, or 10 mm to 25 mm, or 5 mm to 15 mm, or 5 mm to 10 mm, or less.
In an embodiment, the tensioning travel range 320 can have a value in a range of 0.25 in to 6 in, or 0.25 in to 2.0 in, or 0.5 in to 1.75 in, or 0.5 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.75 in, or 0.25 in to 0.5 in, or 0.25 in to 0.4 in. In another embodiment, the tensioning travel range 320 can have a value in a range of 5 mm to 100 mm, or 10 mm to 75 mm, or 10 mm to 50 mm, or 5 mm to 30 mm, or 5 mm to 25 mm, or 5 mm to 20 mm, or 5 mm to 10 mm, or less.
In an embodiment, the tightening distance 324 can have a value in a range of 0.25 in to 6 in, or 0.25 in to 2.0 in, or 0.25 in to 1.75 in, or 0.25 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.75 in, or 0.25 in to 0.5 in, or 0.25 in to 0.4 in. In another embodiment, the tightening distance 324 can have a value in a range of 5 mm to 100 mm, or 10 mm to 75 mm, or 10 mm to 50 mm, or 5 mm to 30 mm, or 5 mm to 25 mm, or 5 mm to 20 mm, or 5 mm to 10 mm, or less.
In an embodiment, the loosening distance 325 can have a value in a range of 0.25 in to 6 in, or 0.25 in to 2.0 in, or 0.25 in to 1.75 in, or 0.25 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.75 in, or 0.25 in to 0.5 in, or 0.25 in to 0.4 in, or 0.25 in to 0.3 in. In another embodiment, the loosening distance 325 can have a value in a range of 5 mm to 100 mm, or 5 mm to 75 mm, or 5 mm to 50 mm, or 5 mm to 35 mm, or 5 mm to 30 mm, or 5 mm to 25 mm, or 5 mm to 20 mm, or 5 mm to 15 mm, or 5 mm to 10 mm, or 5 mm to 8 mm, or less.
In an embodiment, a chain brake clearance 807 can be provided between a portion of the chain brake band 805 and the tensioning shaft proximal tangent 384. The chain brake clearance can have a value which ranges from a tangential contact of 0 mm, or can be in a range of less than 0.01 in to 4 in, or greater. In a nonlimiting example, the chain brake band clearance 807 can have a value in a range of 1 mm to 25 mm, such as 3 mm, 4 mm, 5 mm, 10 mm, or greater.
In another embodiment, a chain brake clearance 807 can be provided between a portion of the drum 810 and the tensioning shaft proximal tangent 384. The chain brake clearance can have a value which ranges from a tangential contact of 0 mm, or can be in a range of less than 0.01 in to 4 in, or greater. In the example of
In an embodiment, the travel distance 2000 can have a value in a range of 4 in, or less; or 2.5 in, or less; or 2.0 in, or less; or 1.75 in, or less; or 1.5 in, or less; or 1.0 in, or less; or 0.75 in, or less; or 0.5 in, or less; such as 0.25 in, or 0.5 in, or 0.75 in, or 1.0 in, or 1.25 in, or 1.5 in, or 1.75 in, or 2.0 in, or 2.5 in, or 3.0 in, or 3.5 in. In another embodiment, the travel distance 2000 can have a value in a range of 125 mm, or less; or 75 mm, or less; or 50 mm, or less; or 40 mm, or less; or 35 mm, or less; or 30 mm, or less; or 25 mm, or less; or 20 mm, or less.
As shown in
A tensioning post range guide 329 of the tensioning post channel 311 can extend from sprocket centerline to tensioning post range guide proximal end distance 1329 to a sprocket centerline to tensioning post range guide distal end distance 1319. The tensioning post channel 311 can have a tensioning post guide range width 328 and a tensioning post channel centerline 1301.
The example of
The oil slot 890 can have an oil slot width 1891 which can have a value in a range of from 0.05 in to 0.5 in, or 0.1 in to 0.3 in, or 0.1 in to 0.25 in, such as 0.1 in, 0.12 in, 0.2 in, or 0.3 in. The oil slot length 1889 can extend between the oil slot proximal end 1507 and the oil slot distal end 1517.
The offset guide to chain bar centerline distance 1303 is shown extending between the chain bar centerline 1201 and the tensioning post channel centerline 1301. In an embodiment, the offset guide to chain bar centerline distance 1303 can have a value of 0.25 in, or greater, such as in a range of from 0.25 in to 1.5 in, or 0.25 in to 1.0 in, or 0.25 in to 0.5 in to 0.75 in, or 0.4 in to 0.75 in, or 0.45 in to 0.55 in, such as 0.45 in, or 0.48 in or 0.50 in, or 0.51 in, 0.52, or 0.55 in.
In an embodiment, an oil slot centerline to tensioning post channel centerline distance 1897 can have a value of 0.5 in, or greater, or in a range of 0.5 in to 3.0 in, or 0.5 in to 2.5 in, or 0.5 in to 1.5 in, or 0.5 in to 1.0 in, such as 0.7 in, 0.8 in, 0.9 in, or 1.0 in, 1.1 in, or 1.25 in.
In an embodiment, the sprocket centerline to bar tightening bolt distance 1231 can be the distance between the sprocket centerline 231 and the bar tightening bolt centerline 157. The bar tightening bolt distance 1231 can have a value in a range of 1.0 in to 6 in, or 1.5 in to 5 in, or 1.5 in to 3 in, or 1.5 in to 2.5 in, such as 1.75 in, or 2.0 in, or 2.25 in, or 2.5 in. In an embodiment, the bar tightening bolt distance 1231 is greater than 1.75 in, such as 1.98 in, 2.0 in, or 2.01 in, or 2.05 in.
The sprocket centerline to oil slot distance 1888 can be the distance from the sprocket centerline 231 to the oil slot distal end 1507. In an embodiment, the sprocket centerline to oil slot distance 1888 can be less than 5 in and varies according to the location of the tensioning post centerline distance 1330 which positions the chain bar 200 relative to the sprocket 230. In an embodiment, the sprocket centerline to oil slot distance 1888 can have a value in a range of from 0.5 in to 5 in, or 0.5 in to 3.5 in, or 1 in to 2.5 in, such as 1 in, 1.5 in, 2 in, or 3.0 in.
The bar tightening bolt to chain bar outer radius 1509 is shown. In an embodiment, the bar tightening bolt to chain bar outer radius 1509 can have a value which is equal to or greater than 1 in, or in a range of 1.0 in to 8 in, or 3.0 in to 7.5 in, or 2.5 in to 6 in, or 3.0 in to 6 in, such as 2.0 in, 3.0 in, 4.0 in, 5.0 in or 6 in.
In an embodiment, the oil cap 710 and/or the oil cap body 725 and/or oil cap seal 720, or other portion of the oil cap assembly 705, can be made at least in part or wholly of a metal, a polymer, a plastic, a reinforced polymer, a reinforced plastic, a ceramic, a cured resin, a thermoplastic or other material suitable for the uses described herein. In an embodiment, the oil cap 710 and/or the oil cap body 725 and/or oil cap seal 720, or other portion of the oil cap assembly 705, can be made at least in part of a 30% glass fiber reinforced, heat stabilized, black polyamide 6 resin for injection molding, such as DSM Akulon® N24-G6 PA6-GF30 (DSM, Het Overloon 1, 6411 TE Heerlen (NL), Tel. +31 (0)45 578 8111). In another embodiment, the oil cap 710 and/or the oil cap body 725 and/or oil cap seal 720, or other portion of the oil cap assembly 705, can be made at least in part of a carbon fiber reinforced polymer which can be 10% or greater by mass of carbon fiber. The percent of material reinforcement can vary widely to satisfy the uses disclosed herein.
To overcome resistance to movement in the direction of channel lock direction arrow 1725 of the oil cap assembly 705 by the first detent 733 and the second detent 743, the operator can impart an increased rotational force in the direction of channel lock direction arrow 1725. This will cause the first adapter post 739 to force the first detent 733 and first sound paddle 791 in the direction of clearance arrow 1730 and the second adapter post 749 to force the second detent 743 and second sound paddle 792 in the direction of clearance arrow 1730. The deformation of the oil cap body 725 to move the first detent 733 and second detent 743 to allow the respective clearance of the first adapter post 739 and second adapter post 749 builds up potential energy and/or a spring energy in the oil cap body 725. The deformation of the oil cap body 725 moving the first detent 733 and second detent 743 to allow the respective clearance of the first adapter post 739 and second adapter post 749 also moves the first sound paddle 791 and the second sound paddle 792 away from their resting state configuration in the general direction of clearance arrow 1730 and imparts a potential energy and/or spring energy in the respective first sound paddle 791 and the second sound paddle 792 as well as in the oil cap body 725.
When the first adapter post 739 is forced in the direction of channel lock direction arrow 1725 beyond and clears the first detent 733, the first adapter post 739 enters the first channel cavity 735. When the second adapter post 749 is forced in the direction of channel lock direction arrow 1725 beyond and clears the second detent 743, the second adapter post 749 enters the second channel cavity 745.
When the first adapter post 739 is forced in the direction of channel lock direction arrow 1725 beyond and clears the first detent 733, then the first detent 733 and the first sound paddle 791 can snap back and/or spring back into a resting state which releases the stored potential energy and/or spring energy through the return motion and generating sound. When the second adapter post 749 is forced in the direction of channel lock direction arrow 1725 beyond and clears the second detent 743, the second detent 743 and second sound paddle 792 snap back and/or spring back into a resting state which released the stored potential energy and/or spring energy through the return motion and generating sound.
The sound described herein as a “snap sound” can be generated by at least the first detent 733 and the first sound paddle 791 snapping back from an energized to a rest position. For example, in an embodiment, the release of energy from the first detent 733 and the first sound paddle 791 snapping back and/or springing back into a resting state can generate an audible and/or a snap sound letting the operator know that the oil cap assembly 705 is in a locked position. The release of energy from the second detent 743 and the second sound paddle 792 snapping back and/or springing back into a resting state can also generate a snap sound, or contribute to a combined snap sound from both the second detent 743 and the second sound paddle 792 generating sound concurrently, or in an overlapping sound event.
The snap sound can be generated by one or more detents and/or one or more respective paddles of the detents. For example, in an embodiment, the snap sound generated by the first detent 733 and the first sound paddle 791 snapping back and/or springing back into a resting state can have a sound level in a range of from 10 dB (decibels) to 150 dB, or 30 dB to 90 dB, or 40 dB to 80 dB, or 50 dB to 75 dB, or 50 dB to 90 dB, such as 40 dB, or 45 dB, or 50 dB, or 55 dB, or 60 dB, or 65 dB, or 70 dB, or 75 dB, or 80 dB. In an embodiment, the snap sound can be 50 dB, or 56 dB, or 60 dB, or 66 dB, or 70 dB, or 76 dB, or 80 dB. A release snap sound can have a value equivalent to the snap sound when the first adapter post 739 is unlocked from the first channel cavity 735 past the first detent 733 and into the first channel cavity 735.
The snap sound generated by the second detent 743 and the second sound paddle 792 snapping back and/or springing back into a resting state can have a sound level in a range of from 10 dB to 150 dB, or 30 dB to 90 dB, or 40 dB to 80 dB, or 50 dB to 75 dB, such as 40 dB, or 45 dB, or 50 dB, or 55 dB, or 60 dB, or 65 dB, or 70 dB, or 75 dB. In an embodiment, the snap sound can be 50 dB, or 56 dB, or 60 dB, or 66 dB, or 70 dB, or 76 dB, or 80 dB. A release snap sound can have a value equivalent to the snap sound when the second adapter post 749 is unlocked from the second channel cavity 745 past the second detent 743 and into the second channel cavity 745.
The snap sound generated together and/or in an overlapping fashion by the first detent 733 and the first sound paddle 791 and the by the second detent 743 and the second sound paddle 792 snapping back and/or springing back into a resting state can be combined to produce an oil cap snap sound which can have a sound level in a range of from 10 dB to 150 dB, or 30 dB to 90 dB, or 40 dB to 80 dB, or 50 dB to 75 dB, such as 45 dB, or 50 dB, or 55 dB, or 60 dB, or 65 dB, or 70 dB. In an embodiment, the snap sound can be 50 dB, or 56 dB, or 60 dB, or 66 dB, or 70 dB, or 76 dB.
In an embodiment, a snap sound or oil cap snap sound can also be generated when the oil cap assembly 705 is rotated to move one or more of an adapter post, e.g. the respective first adapter post 739 and second adaptor post 749, out of the locked position and past one or more respective detents, e.g. the first detent 733 and second detent 743. The lock release snap sound can have a combined sound level resulting from the release of one or more of an adapter post, e.g. one or both of the first adapter post 739 and second adaptor post 749 to unlock the oil cap assembly 705, in a range of from 10 dB to 150 dB, or 30 dB to 90 dB, or 40 dB to 80 dB, or 50 dB to 75 dB, such as 45 dB, or 50 dB, or 55 dB, or 60 dB, or 65 dB, or 70 dB. In an embodiment, the snap sound can be 50 dB, or 56 dB, or 60 dB, or 66 dB, or 70 dB, or 76 dB.
FIG. 14D1 is a close up view of a first embodiment of a lock channel 729. FIG. 14D1 shows a lock channel entry 1732 (e.g. first channel entry 732 and second channel entry 742) having a channel entry width 2742 into which passes an adapter post 2739 (e.g. first adapter post 739 and second adapter post 749). The adapter post 2739 meets the first channel edge 2760 in transition zone 2745 in which the direction of movement transitions from that of entry arrow 2942 to that of lock direction arrow 2929. In the example embodiment shown in FIG. 14D1, the first channel edge 2760 and the second channel edge 2770 are not parallel and are configured to have an average channel angle 2990. The average channel angle accounts for the optional curving and/or sloping of portions of each of the first channel edge 2760 and the second channel edge 2770.
The geometries of the first channel edge 2760 and the second channel edge 2770, as well as the average channel angle 2990 result in different distances between the first channel edge 2760 and the second channel edge 2770 along the lock channel length 2890 of lock channel 729. For example, the channel mouth dimension 2747 of the channel mouth 1747, is greater than the middle channel dimension 2749 of the middle channel region 1749.
The detent 2743 (e.g. first detent 733 and second detent 743) can provide a narrowing of the lock channel 729 just prior to the channel cavity 1735 (e.g. first channel cavity 735 and second channel cavity 745) or the detent 2743 can form a part of the channel cavity 1735. In FIG. 14D1 the detent 2743 has a detent height 2798 at the apex of the detent which produces a detent clearance 2799.
Optionally, as shown in the example of FIG. 14D1, the adapter post 2739 and the first channel edge 2760 can be configured to have an upper post clearance 2747. In this configuration, the adapter post 2739 can act by frictionally contacting the second channel edge 2770, but can be free of contact for at least part of the channel length from the first channel edge 2760. Optionally, in the region of the detent 2743 the adapter post 2739 can contact the second channel edge 2770 as it interacts with and passes across the detent 2743 through the detent clearance 2799.
In an embodiment, the lock channel 729 can have an average channel angle of 2990 which can have a value of 30°, or less, or in a range of from 0° to 30°, or 5° to 25°, or 8° to 25°, or 10° to 20°, or 10° to 15°, such as 5°, or 7°, or 10°, or 12°, or 15°. The lock channel 729 can also have a ramp angle 2991 which can have a value of 25°, or less, or in a range of from 0° to 25°, or 3° to 12°, or 5° to 10°, or 7° to 15°, or 10° to 15°, such as 5°, or 7°, or 8°, or 9°, or 10°, or 11°, or 12°. In an embodiment, a ramp rise 2993 can be measured prior to the detent having a value of 0 mm to 10 mm can be used, or 1 mm to 8 mm, or 3 mm to 6 mm, or 2 mm to 3 mm, such as 2 mm, 3 mm, 4 mm, 5 mm, 6 mm or 8 mm.
FIG. 14D2 is a side view of a second embodiment of a lock channel 729. In the example of FIG. 14D2, the lock channel 729 has the ramp angle 2991 and the ramp rise 2993, but does not show the detent 2743. The lock channel 729 of FIG. 14D2 is shown to have a channel cavity 1735 with a channel cavity diameter 1737, the middle channel region 1749 and the channel mouth 1747 which through which the adapter post 2739 can pass after entering the channel entry 1732. In the embodiment of FIG. 14D2, a lock channel height 1739 is shown, as well as the offset entry distance 1733, the ramp height 1734 and the cavity trough height 1736. FIG. 14D2 also shows an edge rise angle 2749 which can be measured form ramp base 2781 to the second edge 2783. Channel height 2747 can be measured from the first channel edge 2779 to the second edge 2783. The lock channel length 2890 is also shown.
In the example of
In an embodiment, the first channel arc length 1910 can have a value which is a fraction of the oil cap body outer circumference 1905, such as a fraction in a range greater than zero and less than 50%. For example the first channel arc length 1910 can be ⅓, or ¼, or ⅕, or ⅙, or ⅛ of the length of the circumference. In one example, the oil cap 710 is a ¼ turn oil cap for which each channel arch length, e.g. the first channel arc length 1910 and/or the second channel arc length 1952 is ¼ (25%) of the oil cap body outer circumference 1905.
In other example embodiments, the first channel arch length 1910 can be in a range of 0.2 in to 6 in, or 0.25 in to 4 in, or 0.3 in to 3 in, or 0.3 in to 1.5 in, or 0.3 in to 1.0, or 0.25 in to 0.75 in, such as 0.25 in, 0.50 in, 0.75 in, 1.0 in, 1.5 in, 2.0 in, 2.5 in, 3.0 in. In an embodiment, the first channel arc 1912 can have a value which is greater than zero degrees and less than 180°, or a value in a range of 10° to 120°, or 15° to 90°, or 15° to 60°, or 20° to 60°, or 25° to 50°, or 60° to 100°, or 80° to 100°, such as 120°, or 90°, or 60°, or 45°, or 30°, or 25°.
In other example embodiments, the second channel arch length 1950 can be in a range of 0.2 in to 6 in, or 0.25 in to 4 in, or 0.3 in to 3 in, or 0.3 in to 1.5 in, or 0.3 in to 1.0, or 0.25 in to 0.75 in, such as 0.25 in, 0.50 in, 0.75 in, 1.0 in, 1.5 in, 2.0 in, 2.5 in, 3.0 in. In an embodiment, the second channel arc 1952 can have a value which is greater than zero degrees and less than 180°, or a value in a range of 10° to 120°, or 15° to 90°, or 15° to 60°, or 20° to 60°, or 25° to 50°, or 60° to 100°, or 80° to 100°, such as 120°, or 90°, or 60°, or 45°, or 30°, or 25°.
The scope of this disclosure is to be broadly construed. It is intended that this disclosure disclose equivalents, means, systems and methods to achieve the devices, activities and mechanical actions disclosed herein. For each mechanical element, mechanism, method and/or process disclosed, it is intended that this disclosure also encompasses in its disclosure and teaches, equivalents, means, systems and methods for practicing the many aspects, mechanisms and devices disclosed herein. Additionally, this disclosure regards a chainsaw and its many aspects, features and elements. Such a chainsaw can be dynamic in its use an operation, this disclosure is intended to encompass the equivalents, means, systems and methods of the use of the tool and its many aspects consistent with the description and spirit of the operations and functions disclosed herein. The claims of this application are likewise to be broadly construed.
The description of the inventions herein in their many embodiments is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
This patent application claims benefit of pending of PCT Application No. PCT/CN2015/087366 entitled “Low Profile Chain Saw” filed Aug. 18, 2015.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2015/087366 | 8/18/2015 | WO | 00 |