JP2012213914A - Guide bar of chain saw and chain saw - Google Patents

Abstract

[PROBLEMS] To reduce the fatigue of an operator's wrist and arm and improve the compatibility with various work when carrying out a branching work at a high place in a portable chain saw such as a top handle type. Can be made.
A guide bar 10 that slidably guides a saw chain 11 of a chain saw, and includes a long hole 12 into which a positioning member 21 to be attached to a chain saw body is fitted on a central axis L1 along a longitudinal direction. The long hole 12 includes an inclination angle adjusting hole portion 12B for adjusting the inclination angle of the guide bar in a state where the tension of the saw chain 11 is maintained by the chain tension adjusting mechanism of the chain saw.
[Selection] Figure 1

Description

  The present invention relates to a chain saw guide bar used for cutting, cutting, and the like of wood and a chain saw having a function of adjusting a tilt angle of the guide bar.

  In general, a chain saw guide bar is detachably attached to the chain saw body, slidably guides a saw chain that is hung on a sprocket mounted on the drive shaft of the chain saw body, and is necessary for this saw chain. Fixed to the chain saw body with tension applied. To fix the guide bar to the chain saw body, insert a long hole formed in the base end of the guide bar into the stud bolt attached to the side of the chain saw body, and then cover the base end of the sprocket or guide bar. Fit the mounting hole provided in the guard part of the side cover into this stud bolt, screw the nut into the stud bolt from the outside of this guard part, press the guard part to the chain saw body side by tightening the nut, and the guard part The base end of the guide bar is clamped and fixed by the chain saw body.

  Further, some conventional chain saws include a chain tension adjusting mechanism that applies an appropriate tension to the saw chain. For example, as described in Patent Document 1 below, this chain tension adjusting mechanism is screwed into a threaded rod member having a threaded portion disposed along the longitudinal direction of the guide bar and the threaded portion of the threaded rod member. And an engagement member engaged with the engagement hole of the guide bar, and after loosening a nut for fixing the guide bar to the chain saw body, the screw rod member is turned with a tool to turn the engagement member into the screw rod member. The guide bar engaged therewith is moved in a direction away from the sprocket.

No. 8-8082

  As a portable chain saw, a top handle type chain saw in which a handle is provided on an upper portion of a machine body is known. This chain saw is used for various operations because of its relatively small size.

  In general, when working with the arm pushed down, it is easier to work if the guide bar is attached to the chain saw body in a state substantially parallel to the front-rear direction of the handle. ), It is easier to work if the guide bar is mounted upward on the chain saw body. Furthermore, in a tree-branching operation at a high place or a pruning operation such as a roadside tree, it is easier to work if the guide bar is attached to the chain saw body so as to be inclined downward. Therefore, if the guide bar is fixedly tilted and attached to the chain saw body, there will be a problem in compatibility with various work, and for that reason, there will be a problem that the wrist and arm fatigue of the operator will increase. Arise.

  As a technique for solving these problems, it is conceivable to allow the inclination angle of the guide bar to be adjusted arbitrarily by giving a margin to the width of the long hole of the guide bar into which the positioning member such as the stud bolt is fitted. It is difficult to adjust the inclination angle of the guide bar while keeping the tension of the chain, and the trouble of separately adjusting the tension of the saw chain and the inclination angle of the guide bar arises.

  This invention makes it an example of a subject to cope with such a problem. In other words, in a hand-held chain saw such as a top handle type, it is possible to reduce the fatigue of the wrist and arm of the operator, and to improve the adaptability to various work by making the tilt angle of the guide bar adjustable. That the tension of the saw chain can be maintained even when adjusting the inclination angle of the guide bar, both the lower side (belly side) and the upper side (back side) of the saw chain guided by the guide bar It is an object of the present invention that the inclination angle of the guide bar can be adjusted in accordance with the work situation even when using differently depending on the situation.

  In order to achieve such an object, a chain saw guide bar and a chain saw provided with the guide bar according to the present invention have at least the following configurations.

  A guide bar that slidably guides a saw chain of a chain saw, and has a long hole into which a positioning member to be attached to the chain saw body is fitted on a central axis along a longitudinal direction, the long hole being a chain saw chain A guide bar for a chain saw, comprising a tilt angle adjusting hole for adjusting a tilt angle of the guide bar in a state where the tension of the saw chain is maintained by a tension adjusting mechanism.

  A chain saw body on which a positioning member is mounted, a guide bar that is mounted on the chain saw body and has a long hole along the central axis into which the positioning member is fitted, and a saw chain that is slidably guided by the guide bar A chain tension adjusting mechanism that adjusts the tension of the saw chain by moving the guide bar along its longitudinal direction, and the elongated hole of the guide bar is stretched by the chain tension adjusting mechanism. A chain saw comprising an inclination angle adjusting hole for adjusting the inclination angle of the guide bar in a state where the guide bar is maintained.

  A guide bar or chain saw having such a feature can be adjusted arbitrarily by adjusting the chain tension adjusting mechanism by attaching the guide bar to an existing chain saw body having a chain tension adjusting mechanism. It becomes possible. As a result, it is possible to selectively switch between a state in which the guide bar is mounted along the reference axis direction of the chain saw body and a state in which the guide bar is tilted upward or downward with respect to the reference axis direction of the chain saw body. In addition, the inclination angle at that time can be arbitrarily adjusted. As a result, in a hand-held chain saw such as a top handle type, the guide bar can be tilted with respect to the chain saw body according to the work, thereby reducing fatigue of the wrist and arm of the operator and various work. It is possible to improve the responsiveness to. Further, the inclination angle of the guide bar according to the work situation can be easily adjusted while keeping the tension of the saw chain.

It is explanatory drawing which showed the guide bar which concerns on embodiment of this invention, FIG. 1 (a) is a general view, FIG.1 (b) is principal part explanatory drawing, FIG.1 (c) is a guide concerning another embodiment. It is principal part explanatory drawing of a bar. It is explanatory drawing explaining the function of the guide bar which concerns on embodiment of this invention. It is explanatory drawing which showed one structural example (top handle type chain saw) of the chainsaw which concerns on embodiment of this invention. It is explanatory drawing which shows an example of a chain tension adjustment mechanism, and has shown XX sectional drawing in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description and claims, the side mounted on the chain saw body is referred to as the rear (or rear side) and the non-mounting side (free end side) is the tip (or tip) with respect to the longitudinal direction of the guide bar. Side). One of the directions intersecting with the longitudinal direction of the guide bar is referred to as “up” (or upper side), and the other of the directions intersecting with the longitudinal direction of the guide bar is referred to as “down” (or lower side). In addition, the code | symbol of the following drawings attaches | subjects the same code | symbol to a common site | part, and abbreviate | omits some duplication description.

  FIG. 1 is an explanatory view showing a guide bar according to an embodiment of the present invention, in which FIG. 1 (a) is an overall view, FIG. 1 (b) is a main part explanatory view, and FIG. 1 (c) is another embodiment. It is principal part explanatory drawing of the guide bar which concerns on.

  The guide bar 10 is attached to a chain saw body (not shown) and slidably guides an endless saw chain 11 wound around a sprocket mounted on a drive shaft of the chain saw body. A guide groove 10A for guiding the saw chain 11 is provided.

  The guide bar 10 includes a long hole 12 into which a positioning member 21 attached to the chain saw body is fitted on a central axis L1 along the longitudinal direction. In the illustrated example, two positioning members 21 (first positioning member 21 </ b> A and second positioning member 21 </ b> B) are inserted into the long holes 12. The positioning member 21 can also be used as a stud bolt for sandwiching and fixing the guide bar 10. Further, in a model having only one stat bolt, two positioning members 21 are provided separately from the stud bolt. Further, the guide bar 10 includes an engagement hole 13 that engages with an engagement member of a chain tension adjusting mechanism provided in an existing chain saw body at a position separated from the central axis L1, and a chain oil discharge hole near the outer periphery. 14.

  The long hole 12 includes a linear hole portion 12A having a substantially constant hole width t1 along the central axis L1, and a hole width portion t2 (t2) widened with respect to the hole width t1 of the linear hole portion 12A. Is provided with an inclination angle adjusting hole portion 12B. The straight hole portion 12A is provided on the distal end side of the long hole 12, and the inclination angle adjusting hole portion 12B is provided on the rear side thereof. The length along the central axis L1 of the linear hole portion 12A is secured to a length sufficient to give an appropriate tension to the saw chain 11 by a chain tension adjusting mechanism equipped on an existing chain saw body. .

  The inclination angle adjustment hole 12B is a hole that is designed so that the inclination angle of the guide bar 10 can be adjusted while the tension of the saw chain 11 is maintained by a chain tension adjustment mechanism installed in an existing chain saw body. And it is formed in a part of the long hole 12. Further, the inclination angle adjusting hole 12B includes a first engagement portion 12B1 for inclining the guide bar 10 downward by engaging the first positioning member 21A on the distal end side, and a second positioning member on the rear side. A second engaging portion 12B2 that tilts the guide bar 10 upward by engaging 21B is provided. Here, the first positioning member 21A is mounted on the distal end side of the chain saw body among the two positioning members 21, and the second positioning member 21B is disposed on the rear side of the chain saw body among the two positioning members 21. It is to be attached.

  In the example shown in FIG. 1B, the inclination angle adjusting hole 12 </ b> B is provided only on the upper side with respect to the central axis L <b> 1 of the guide bar 10. In this example, the engagement hole 13 with which the engagement member of the chain tension adjustment mechanism is engaged is a position separated from the central axis L1, and on the side where the inclination angle adjustment hole 12B is provided with respect to the central axis L1. It is provided at the opposite (lower) position.

  In the example shown in FIG. 1C, a pair of inclination angle adjusting hole 12 </ b> B, engagement hole 13, and chain oil discharge hole 14 are provided symmetrically with respect to the central axis L <b> 1 of the guide bar 10. In the example of FIG. 1C, the angle adjustment function can be obtained as described above even if the image is turned upside down.

  FIG. 2 is an explanatory view illustrating the function of the guide bar according to the embodiment of the present invention. The guide bar 10 is mounted on a chain saw body having an existing chain tension adjusting mechanism, and the inclination angle of the guide bar 10 can be arbitrarily adjusted by an adjustment operation of the chain tension adjusting mechanism. Here, an example is shown in which the guide bar 10 shown in FIG. 1B is attached to a chain saw body provided with two positioning members 21 (first positioning member 21A and second positioning member 21B). The positioning member 21 </ b> A and the second positioning member 21 </ b> B are fitted in the long hole 12 of the guide bar 10. The structure of the chainsaw body including the existing chain tension adjusting mechanism will be described later. If the reference axis L2 of the chainsaw body is an axis passing through the centers of the two positioning members 21, the chain tensioning operation of the chain tension adjusting mechanism is performed. The engagement hole 13 moves along the adjustment axis L3 parallel to the reference axis L2.

  FIG. 2A shows a state in which the first positioning member 21 </ b> A is located at the distal end position of the long hole 12. This state is a state in which the guide bar 10 to be mounted on the chain saw body is closest to the sprocket of the chain saw body. In this state, a saw chain (not shown) is wound around the guide bar 10.

  FIG. 2B shows a state where the guide bar 10 is moved by the chain tension adjusting mechanism, and the engagement hole 13 is moved to the tip side by the distance X1. As shown in the drawing, at the stage where the first positioning member 21A is positioned in the linear hole portion 12A of the long hole 12, the guide bar 10 moves to the tip side along the reference axis L2 of the chain saw body, and the linear hole portion 12A. Appropriate tension is applied to the saw chain at the rear end position. When the guide bar 10 is fixed to the chain saw body at this stage, the guide bar 10 is mounted on the chain saw body with its center axis L1 aligned with the reference axis L2 of the chain saw body.

  FIG. 2C shows a state in which the guide bar 10 is further moved to the distal end side by the chain tension adjusting mechanism, and the engagement hole 13 is moved to the distal end side by a distance X2 (> X1). When the first positioning member 21A is out of the range of the linear hole portion 12A of the long hole 12, the tip of the guide bar 10 is inclined downward by its own weight and the tension of the saw chain, and the first positioning member 21A as shown in the figure. Is supported in a state of being engaged with the first engaging portion 12B1 of the inclination angle adjusting hole 12B. By setting the first engagement portion 12B1 to a desired position and shape, the guide bar 10 is supported at an arbitrary angle within the setting range.

  That is, the distance X1 of the engagement hole 13 in FIG. 2B is gradually increased, and the center of the guide bar 10 with respect to the reference axis L2 of the chain saw body when the first positioning member 21A is disengaged from the linear hole 12A. The inclination of the axis L1 starts, and the angle α1 of the central axis L1 of the guide bar 10 with respect to the reference axis L2 of the chain saw body can be arbitrarily set by arbitrarily adjusting the distance X2 in FIG. In the state shown in FIG. 2 (c), the saw chain is always in a tensioned state. Therefore, the inclination angle of the guide bar 10 can be adjusted while the tension of the saw chain is maintained.

  FIG. 2D shows a state in which the guide bar 10 is further moved to the distal end side by the chain tension adjusting mechanism, and the engagement hole 13 is moved to the distal end side by a distance X3 (> X2). In this state, the tension of the saw chain is applied beyond the tension necessary to hold the guide bar horizontally, and the tip of the guide bar 10 is lifted by this tension.

  FIG. 2E shows a state in which the guide bar 10 is further moved to the distal end side by the chain tension adjusting mechanism, and the engagement hole 13 is moved to the distal end side by a distance X4 (> X3). When the tension of the saw chain is further increased from the state shown in FIG. 2 (d), the tip of the guide bar 10 is inclined upward by this tension, and the second positioning member 21B is the second of the inclination angle adjusting hole 12B as shown in the figure. It is supported in a state of being engaged with the engaging portion 12B2. By setting the second engagement portion 12B2 to a desired position and shape, the guide bar 10 is supported at an arbitrary angle within the set range.

  That is, the angle α2 of the central axis L1 of the guide bar 10 with respect to the reference axis L2 of the chain saw body can be arbitrarily set by arbitrarily adjusting the distance X4 in FIG. In the state shown in FIG. 2 (e), the saw chain is always in a tensioned state, so that the inclination angle of the guide bar 10 can be adjusted while the tension of the saw chain is maintained.

  FIG. 3 is an explanatory view showing a configuration example (top handle type chain saw) of the chainsaw according to the embodiment of the present invention. In the chain saw 1, the above-described guide bar 10 is mounted on the chain saw body 20, and the saw chain 11 is wound around the guide bar 10 so as to be slidably guided. The chain saw body 20 is equipped with an engine (for example, an air-cooled two-cycle gasoline engine) 22 (detailed illustration is omitted) as a prime mover for rotationally driving the saw chain 11, and a recoil starter handle 23 for starting the engine 22 is inclined rearward. It is distributed upward. A hand protect guard 24 is disposed at the front of the chain saw body 20. In the illustrated example, the positioning member 21 described above is also used by two stud bolts.

  The chainsaw body 20 includes a handle (top handle) 25 from the upper part to the rear part. The handle 25 includes a top grip portion 25A extending in the front-rear direction so as to follow the upper portion of the chain saw body 20, and a rear connection portion 25B extending from the top grip portion 25A to the rear side of the chain saw body 20. The top grip portion 25A of the handle 25 is provided with an engine stop switch 26, a throttle control lockout 27, and a throttle trigger 28. An air cleaner cover 29 with a detachable knob 29A is detachably attached to the rear side connecting portion 25B.

  The above-described positioning member 21 (21A, 21B) is attached to the chain saw body 20, and the guide bar 10 is connected to the chain saw by tightening the nuts 30, 30 that are screwed into the positioning member 21 (21A, 21B) also serving as stud bolts. Mounted on the main body 20. Further, the side case 20A on the side surface of the chain saw body 20 is provided with an adjustment operation portion 41 of a chain tension adjusting mechanism. The chain tension adjusting mechanism itself is known, and any mechanism can be used as long as it moves the engaging member engaged with the engaging hole 13 of the guide bar 10 along the reference axis L2 of the chain saw body 20. There may be. For example, a mechanism as described in Japanese Utility Model Publication Nos. 8-8082 and 10-286802 can be employed.

  FIG. 4 is an explanatory view showing an example of the chain tension adjusting mechanism, and shows an XX cross-sectional view in FIG. The chain tension adjusting mechanism 40 is provided in the side case 20 </ b> A of the chainsaw body 20. The side case 20 </ b> A has a hole through which a positioning member 21 that also serves as a stud bolt protruding from the chain saw body 20 side is inserted, and the positioning member (stud bolt) 21 is inserted into the hole to attach the mounting surface 20 </ b> B of the chain saw body 20. The guide bar 10 is sandwiched between the two. A screw rod member 42 is rotatably supported on the side case 20A. The screw rod member 42 is disposed along the above-described adjustment axis L <b> 3 that is substantially parallel to the guide bar 10. The head portion 42A of the screw rod member 42 is disposed outside the side case 20A and can be rotated. The adjustment operation portion 41 is connected to the end portion of the screw rod member 42 via bevel gears 43 and 44. The threaded rod member 42 can be rotated by the adjusting operation portion 41. An engaging member 45 is screwed into the threaded portion 42 </ b> B of the threaded rod member 42. The engagement member 45 moves along the screw rod member 42 while the rotation of the engagement member 45 itself is prevented by the rotation of the screw rod member 42. The engaging portion 45 </ b> A of the engaging member 45 is engaged with the engaging hole 13 of the guide bar 10. By rotating the head 42A of the screw rod member 42 or the adjustment operation unit 41 by such a mechanism, the engagement member 45 moves along the adjustment axis L3 and engages with the engagement member 45. Ten engagement holes 13 move along the reference axis L2 of the chainsaw body 20.

  The chain tension adjusting mechanism 40 is operated by inserting the long hole 12 of the guide bar 10 into the positioning member 21 that also serves as a stud bolt, winding the saw chain 11 around the guide bar 10, and then the side case 20A and the chain saw body 20. The nut 30 is loosened in a state where the guide bar 10 is sandwiched between the mounting surface 20B.

  When the head portion 42 </ b> A of the screw rod member 42 or the adjustment operation portion 41 is rotated, the engagement member 45 of the chain tension adjustment mechanism 40 moves to the distal end side along the longitudinal direction of the guide bar 10. At this time, while the first positioning member 21A is fitted in the linear hole portion 12A of the long hole 12 of the guide bar 10, the guide bar 10 is moved along the reference axis L2 of the chain saw body 20, and the saw chain 11 The desired tension is added.

  When the engagement member 45 is further moved to the distal end side and the first positioning member 21A is engaged with the first engagement portion 12B1 of the guide bar 10, the guide bar 10 is in a state where the distal end is inclined downward. Become. Further, when the engagement member 45 is further moved to the distal end side and the second positioning member 21B is engaged with the second engagement portion 12B2 of the guide bar 10, the guide bar 10 is inclined in the upward direction. become. If the nut 30 is tightened when the guide bar 10 is in a desired state, the guide bar 10 can be mounted and fixed to the chain saw body 20 in a desired state.

  According to the guide bar 10 having such a feature or the chainsaw 1 including the guide bar 10, for example, when performing a deburring operation at a high place, the tip of the guide bar 10 is mounted with the tip inclined downward. This makes it possible to reduce fatigue of the wrist and arm of the operator. If the direction of the guide bar 10 is more parallel or upward depending on how the chain saw 1 is used, the direction of the guide bar 10 can be easily changed by operating the chain tension adjusting mechanism 40. . Thereby, the adaptability to various work can be improved.

  Further, since the tension of the saw chain 11 can be maintained when the inclination angle of the guide bar 10 is adjusted, there is no trouble in separately performing the tension adjustment of the saw chain 11 and the inclination angle of the guide bar 10. In addition, the inclination angle of the guide bar 10 can be adjusted.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

1: Chain saw, 10: Guide bar, 11: Saw chain,
12: long hole, 12A: linear hole part, 12B: inclination angle adjusting hole part,
12B1: 1st engagement part, 12B2: 2nd engagement part, 13: Engagement hole,
20: Chainsaw body, 21: Positioning member (stud bolt),
21A: first positioning member, 21B: second positioning member,
40: chain tension adjusting mechanism, 45: engagement member,
L1: Center axis, L2: Reference axis, L3: Adjustment axis

Claims (11)

A guide bar (10) for slidably guiding a saw chain of a chainsaw,
A long hole (12) into which a positioning member to be mounted on the chain saw body is fitted on the central axis (L1) along the longitudinal direction,
The long hole (12) includes an inclination angle adjusting hole (12B) for adjusting an inclination angle of the guide bar in a state where the tension of the saw chain is maintained by a chain tension adjusting mechanism of the chain saw. Guide bar.   The inclination angle adjusting hole (12B) is provided behind the linear hole (12A) in the elongated hole (12), and is widened with respect to the hole width of the linear hole (12A). The chain bar guide bar according to claim 1, further comprising a portion.   The tilt angle adjusting hole (12B) includes an engagement portion (12B1, 12B2) that tilts the guide bar downward by engaging a positioning member attached to the chain saw body on the distal end side. A chain saw guide bar according to claim 1 or 2.   The chain saw according to any one of claims 1 to 3, further comprising an engagement hole (13) that engages with an engagement member of a chain tension adjusting mechanism at a position separated from the central axis (L1). Guide bar.   The inclination angle adjusting hole (12B) includes a first engagement portion (12B1) on the distal end side for inclining the guide bar downward by engaging a first positioning member attached to the chain saw body. 3. The second engagement portion (12 </ b> B <b> 2) for tilting the guide bar upward by engaging a second positioning member mounted on the chain saw body on the rear side. Chainsaw guide bar.   The engagement member of the chain tension adjusting mechanism at a position away from the central axis (L1) and opposite to the side where the inclination angle adjusting hole (12B) is provided with respect to the central axis (L1). The chain saw guide bar according to claim 5, further comprising an engagement hole (13) for engaging the shaft.   The tilt angle adjusting hole (12B) is provided at least at one side with respect to the central axis, and a pair of the engaging holes (13) are provided symmetrically with respect to the central axis. Chainsaw guide bar described in 1. A chainsaw body (20) to which a positioning member (21) is mounted;
A guide bar (10) mounted on the chain saw body (20) and having a long hole (12) into which the positioning member (21) is fitted along a central axis (L1);
A saw chain (11) slidably guided by the guide bar (10);
A chain tension adjusting mechanism (40) for adjusting the tension of the saw chain by moving the guide bar (10) along its longitudinal direction;
The long hole (12) of the guide bar is an inclination angle adjusting hole portion for adjusting the inclination angle of the guide bar (10) in a state where the tension of the saw chain (11) is maintained by the chain tension adjusting mechanism (40). A chain saw (1) comprising (12B). The positioning member (21) includes a first positioning member (21A) located on the distal end side of the guide bar (10) and a second positioning member (21B) located on the rear side,
The tilt angle adjusting hole (12B) includes a first engagement portion (12B1) on the distal end side that tilts the guide bar (10) downward by engaging the first positioning member (21A). The second engagement portion (12B2) for inclining the guide bar (10) upward by engaging the second positioning member (21B) on the rear side. Chain saw (1). The guide bar (10) includes an engagement hole (13) that engages with an engagement member (45) of the chain tension adjusting mechanism (40),
By moving the engagement member (45) of the chain tension adjusting mechanism (40) to the distal end side along the longitudinal direction of the guide bar (10), the first positioning member (21A) is moved to the first engagement. The second positioning member (21B) is engaged with the second engagement portion (12B2) by engaging the portion (12B1) and further moving the engagement member (45) to the distal end side. Chainsaw (1) according to claim 9, characterized in that   The chain saw (1) according to any one of claims 8 to 10, characterized in that the chain saw body (20) is of a top handle type having a handle (25) at the top.

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