JP5390304B2 - Chain saw guide bar mounting mechanism and chain saw - Google Patents

Description

  The present invention relates to a chain saw or a chain saw guide bar mounting mechanism used for cutting or cutting wood.

  In general, a guide bar that slidably supports a chain saw of a chain saw is detachably attached to the chain saw body, and tension necessary for the saw chain hung around a sprocket mounted on the drive shaft of the chain saw body is applied. It is fixed to the chain saw body in the applied state. 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 standing on the side of the chain saw body, and then attach the base end of the sprocket or guide bar. Fit the mounting hole of the guard part to cover 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 and the chain saw body The proximal end of the guide bar is clamped and fixed.

  In order to fix the guide bar in a state where an appropriate tension is applied to the saw chain, a mechanism using a biasing force of a spring has been proposed as described in Patent Document 1 below. In this prior art, the guide bar and the chain saw body are fixed while urging the guide bar toward the tip side by the urging force of the spring. A member called a chain tensioner is attached to the above-described guard part (sprocket guard). It is slidable along the longitudinal direction of the guide bar, and the engagement part (projection part) of this chain tensioner is engaged with a hole (oil hole, etc.) formed in the base part of the guide bar. The guide bar is urged toward the distal end of the chain tensioner, and the operation portion provided at the distal end portion of the chain tensioner is pressed against the spring force to move the position of the engaging portion described above. Engagement between the engaging portion and a hole provided in the guide bar is achieved.

Japanese Patent No. 3142439

  In such a conventional technique, when the fixed state of the guide bar and the chain saw body is released, a biasing force directed to the tip end side of the guide bar automatically works by the spring, and an appropriate tension is applied to the saw chain. It becomes possible. Therefore, according to this prior art, there is an advantage that the tension of the saw chain can be automatically applied. In addition, when the guide bar is mounted, the spring is biased without holding the guide bar by hand and applying tension to the saw chain, so that the operator can concentrate only on tightening the nut on the stud bolt. .

  However, even in the prior art having such a significant advantage, in order to attach the guide bar to the chain saw body, it is necessary to tighten the nut on the stud bolt. In this case, a tightening tool such as a plug wrench is used. There is a need for inconvenience. In order to eliminate this inconvenience, it is easy to install a tightening member with a tightening knob in the guard part instead of a nut. According to this, however, the clamping force for clamping the guide bar between the chain saw body and the guard part Therefore, there is a problem that the saw chain cannot be firmly fixed and the saw chain is easily loosened. Further, according to this, there is a problem that a difference occurs in the fixed state of the guide bar due to individual differences in the tightening force of the operator.

  Further, in the above-described conventional technology, if the tension state of the saw chain is to be adjusted arbitrarily, the bolt must be tightened while adjusting the spring force by pressing the operating portion, and the arbitrary tension state is maintained. Thus, there is a problem that it is difficult to fix the guide bar, and the tension state of the saw chain cannot be adjusted arbitrarily. In addition, when moving the engaging portion or adjusting the tension state of the saw chain described above, it is necessary to press the operating portion so as to directly face the spring force, so a relatively large force is required to move the tensioner. There was a problem that good operability could not be obtained.

  Further, in consideration of workability of the chain saw, the guide bar is mounted in a state inclined slightly upward with respect to the longitudinal axis of the chain saw body. In the prior art described above, if the guide bar is to be mounted on the chain saw body while maintaining the guide bar posture as described above, the nut must be tightened while holding the guide bar posture with one hand. However, there was a problem that good operability could not be obtained.

  This invention makes it an example of a subject to cope with such a problem. In other words, the guide bar can be easily attached to the chain saw body without using a tool such as a plug wrench, and in that case, a secure fixed state is obtained and no difference occurs in the fixed state of the guide bar regardless of who operates it. It is possible to adjust the tension state of the saw chain arbitrarily with a simple operation, to obtain a good operability even when the guide bar is fixed while maintaining a predetermined posture, and simple An object of the present invention is that the posture of the guide bar can be maintained in a predetermined state by one-handed operation, and the guide bar can be firmly and stably attached to the chain saw body.

  In order to achieve such an object, the present invention comprises at least the configurations according to the following independent claims.

  [Claim 1] A chain bar guide bar mounting mechanism for mounting on a chain saw body a guide bar that slidably supports a saw chain on the outer periphery, and a drive unit for driving the base end of the guide bar and the saw chain And a guard portion that presses a base end portion of the guide bar against the chain saw body, and the guard portion engages with an engaged portion formed at the base end portion of the guide bar. A chain tensioner having: a guide member that guides the chain tensioner along the longitudinal direction of the guide bar; and the chain tensioner that is guided by the guide member along the longitudinal direction of the guide bar. A biasing member that biases in the direction, and the chain tensioner and the guide member are guided by the guard portion. Chainsaw guide bar mounting mechanism having a base end portion of the bar is characterized by being engaging portion meshed in a state of being pressed against the formed on the chain saw body.

  [Claim 8] A guide bar for slidably supporting the saw chain on the outer periphery, a chain saw body on which the guide bar is detachably mounted, and a guard part for pressing the base end of the guide bar against the chain saw body A chain saw having an engagement portion that engages with an engaged portion formed at a base end portion of the guide bar, and the chain tensioner is connected to a longitudinal direction of the guide bar. A guide member that guides along the direction of the guide bar; and a biasing member that biases the chain tensioner guided along the longitudinal direction of the guide bar by the guide member toward the tip end of the guide bar. And the guide member is engaged with the base end portion of the guide bar pressed against the chain saw body by the guard portion. Chainsaw, wherein the engagement portion is formed.

It is a side view showing the whole chain saw composition concerning one embodiment of the present invention. It is explanatory drawing explaining the guide bar mounting mechanism of the chainsaw in embodiment of this invention, and is AA sectional drawing in FIG. 1 (state which has loosened the tightening knob part). It is explanatory drawing explaining the guide bar mounting mechanism of the chainsaw in embodiment of this invention, and is AA sectional drawing in FIG. 1 (state which clamp | tightened the clamping knob part). FIG. 2 is an enlarged explanatory view showing in detail a meshing portion of a chain saw guide bar mounting mechanism according to an embodiment of the present invention (FIG. 2A is a state in which the meshing portion is separated; FIG. 2B is a state in which the meshing portion is meshed); ). It is explanatory drawing explaining the movement operation part of the guide bar mounting mechanism of the chainsaw in embodiment of this invention. It is explanatory drawing (side view) which shows the state which removed the guard part from the chain saw main body in the guide bar mounting mechanism of the chain saw in embodiment of this invention. It is explanatory drawing which shows the effect | action of a guide bar attitude | position control board (the figure (a) is a top view, the figure (b) is CC sectional drawing of the figure (a)).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, common portions are denoted by the same reference numerals in each drawing, and a part of the overlapping description is omitted. FIG. 1 is a side view showing the overall structure of a chainsaw according to an embodiment of the present invention. The chain saw 1 includes a guide bar 10 that slidably supports a saw chain 11 on the outer periphery, a chain saw body 20 on which the guide bar 10 is detachably mounted, and a base end portion 10A of the guide bar 10 that is in pressure contact with the chain saw body 20. The guard part 30 which performs is provided at least.

  The guide bar 10 is formed, for example, by joining a large number of plate members, and supports the saw chain 11 slidably in a recess formed in the outer peripheral portion. The saw chain 11 is wound around a sprocket (not shown) in the chain saw body 20 and slides along the outer periphery of the guide bar 10 by the driving force of the driving unit.

  The chain saw body 20 is equipped with an engine (for example, an air-cooled two-cycle engine), a fuel tank, a saw chain lubricating oil tank, or the like that rotationally drives the sprocket described above, and a handle 31 at the top. The handle 31 is equipped with an engine stop switch 31A, a throttle control lockout 31B, a throttle trigger 31C, and the like, and around the handle 31, a recoil starter handle 31D for starting the engine is equipped.

  The guard part 30 is a structural part that is attached to the chain saw body 20 so as to cover the base end part 10A of the guide bar 10 and the sprocket described above, and is attached to the chain saw body 20 by, for example, screwing. More specifically, the guard portion 30 is provided with a tightening knob portion 33, and the tightening knob portion 33 is screwed onto a stat bolt 32 erected from the side portion of the chain saw body 20 and manually tightened. The guard part 30 can be attached to the chain saw body 20 (the tightening knob 33 side may be a bolt, and this bolt may be screwed into the nut part on the chain saw body 20 side).

  The guide bar 10 has a base end portion 10A sandwiched between the chain saw body 20 and the guard portion 30, and by manually tightening the tightening knob portion 33, the guide bar 10 is fixed to the chain saw body 20 and the tightening knob portion. By loosening 33, the guide bar 10 can be removed from the chain saw body 20.

  2 and 3 are explanatory views for explaining a guide bar mounting mechanism of the chainsaw 1 and are cross-sectional views taken along line AA in FIG. 2 shows a state where the tightening knob portion 33 is loosened, and FIG. 3 shows a state where the tightening knob portion 33 is tightened.

  The guide bar mounting mechanism of the chain saw 1 includes a guard portion 30 that covers the base end portion 10A of the guide bar 10 and the drive unit that drives the saw chain 11 and presses the base end portion 10A of the guide bar 10 against the chain saw body 20. The guard portion 30 includes a chain tensioner 40 having an engaging portion 40A that engages with an engaged portion 10B formed at the base end portion 10A of the guide bar 10, and the chain tensioner 40 along the longitudinal direction of the guide bar 10. And a biasing member 42 that biases the chain tensioner 40 guided by the guide member 41 along the longitudinal direction of the guide bar 10 in the direction of the distal end of the guide bar 10 (in the direction indicated by the arrow X). The chain tensioner 40 and the guide member 41 are provided with a base end portion 10 </ b> A of the guide bar 10 by the guard portion 30. Meshing engagement portion 40P in a state of being pressed against the saw body 20, 41P are formed.

  The engaged portion 10B formed at the base end portion 10A of the guide bar 10 can be formed by a hole (for example, an oil hole) formed at the base end portion 10A, and the engaging portion 40A of the chain tensioner 40 is The protrusion can be formed in the hole. The guide member 41 can be formed by a rod-shaped member extending along the longitudinal direction of the guide bar 10, and the biasing member 42 can be formed by a coil spring disposed along the guide member 41.

  As shown in FIG. 2, when the tightening knob portion 33 is loosened, the meshing portions 40P and 41P are separated from each other, and the chain tensioner 40 is movable along the guide member 41 along the longitudinal direction of the guide bar 10. By engaging the engaging portion 40A of the chain tensioner 40 with the engaged portion 10B of the guide bar 10, the chain tensioner 40 causes the guide bar 10 to move in the distal direction (shown by an arrow in the figure) by the urging force of the urging member 42. X direction) and a predetermined tension can be applied to the saw chain (not shown in FIG. 2) according to the urging force of the urging member 42.

  On the other hand, as shown in FIG. 3, when the tightening knob portion 33 is tightened, the meshing portions 40P and 41P are meshed with each other, and the chain tensioner 40 becomes immovable with respect to the guide member 41. By engaging the engaging portion 40A with the engaged portion 10B of the guide bar 10, the guide bar 10 can be fixed to the chain saw body 20 (not shown in FIG. 2).

  FIG. 4 is an enlarged explanatory view showing in detail the above-described meshing portions 40P and 41P (FIG. 4A shows a state where the meshing portions 40P and 41P are separated, and FIG. 4B shows that the meshing portions 40P and 41P mesh. State). The chain tensioner 40 is formed with a hole 40B through which the guide member 41 is inserted, and the chain tensioner 40 is movable along the guide member 41 in a state where it is loosely fitted to the guide member 41 (see FIG. 5A). The engaging portions 40P and 41P are formed on at least a part of both the outer peripheral surface of the guide member 41 and the inner peripheral surface of the hole 40B.

  More specifically, the meshing portion 40P formed on the inner peripheral surface of the hole 40B of the chain tensioner 40 is formed only on the guide bar 10 side (the engaging portion 40A side) of the chain tensioner 40. That is, the engaging portion 40P is formed on the opposite side of the hole 40B to the guide bar 10 side, but the smooth portion 40N is formed on the opposite side of the hole 40B from the guide bar 10 (on the guard portion 30 side). .

  On the other hand, the engaging portion 41 </ b> P formed on the outer peripheral surface of the guide member 41 is formed on the entire outer peripheral surface, and is continuously formed on the entire sliding range of the chain tensioner 40. Accordingly, the chain tensioner 40 can be fixed at an arbitrary position of the guide member 41 by engaging the meshing portion 40P of the chain tensioner 40 at an arbitrary position of the engaging portion 41P of the guide member 41. It is possible to adjust the tension state arbitrarily and almost continuously.

  Further, the chain tensioner 40 is movable in a direction (arrow Y direction in the figure) orthogonal to the longitudinal direction (arrow X direction in the figure) of the guide member 41 with respect to the sliding base 30A of the guard part 30 that supports the guide member 41. An elastic member (plate spring) 43 is interposed between the chain tensioner 40 and the guide member 41 so that the meshing portions 40P and 41P are spaced apart from each other, and the guard portion 30 has an elastic force of the elastic member 43. The base end portion 10A of the guide bar 10 is pressed against the chain saw body 20 against this. Therefore, when the tightening knob portion 33 is loosened, the meshing portions 40P and 41P are forcibly separated by the elastic force of the elastic member 43 as shown in FIG. By tightening the tightening knob 33, the engaging portions 40P and 41P are engaged with each other, and the base end portion 10A of the guide bar 10 is sandwiched between the guard portion 30 and the chain saw body 20 as shown in FIG. It will be in the state.

  As shown in FIGS. 1 and 5, the guard unit 30 includes a movement operation unit (operation lever) 44 for moving the chain tensioner 40 along the guide member 41. The movement operation unit (operation lever) 44 includes a swing link 45 that can swing around a screwing position (stud bolt 32), and the chain tensioner 40 is moved according to the swing operation amount of the swing link 45. Can be moved. That is, the chain tensioner 40 is slidably connected to the swing link 45 along the longitudinal direction thereof, and the swing angle displacement of the swing link 45 is linearly moved along the guide member 41 of the chain tensioner 40. The mechanism is converted to displacement. Therefore, the chain tensioner 40 can be moved along the guide member 41 by moving the movement operation portion (operation lever) 44 coupled to the end of the swing link 45 along the arcuate guide hole 46. it can. At this time, the swing link 45 moves the chain tensioner 40 using the lever action (the fulcrum is the center of rotation, the force point is the moving operation part 44, and the action point is the connecting part with the chain tensioner 40). When the chain tensioner 40 is moved against the urging force of the urging member 42, the moving operation can be performed with a relatively small operation force.

Further, the moving operation portion (operation lever) 44 is formed with a concave finger grip surface 44a so that the pulling operation can be stably performed. The index finger F or the like is placed on the finger grip surface 44a to perform a moving operation. Can do. At this time, by placing a thumb on a thumb-hanging portion 30S (see FIG. 1) formed as a stepped portion on the guard portion 30 and hanging an index finger F on a finger-holding surface 44a of the movement operation portion (operation lever) 44, The advantage that the operation of pulling F is stable is obtained. Note that the shape of the thumb hanging portion 30S may be a shape other than the stepped portion, such as a concave portion or a rib shape, as long as the pulling operation of the index finger F can be performed stably. Further, the position of the thumb hook 30S is not limited to the position shown in FIG. 1, and can be appropriately provided at a position where the pulling operation of the index finger F is stabilized. In a chain saw with a limited installation space, it is not easy to obtain a sufficient operating force while storing the chain tensioner in a compact manner. However, as described above, the operating force of the moving operation unit 44 is relatively large due to the lever action. Further, by providing the above-described finger-hanging structure that is easy to operate, the position of the chain tensioner 40 can be easily adjusted by one-handed operation with a finger.
As the most desirable arrangement, the center of the thumb hanging portion 30S is formed on the left side of the guide hole 46 of the index finger movement operation portion (operation lever) 44. Thereby, the lever action is exhibited to the maximum, and a pulling operation with a light operating force becomes possible.

  FIG. 6 is an explanatory view (side view) showing a state where the guard portion 30 is removed from the chainsaw body 20. A saw chain drive unit 21 including the sprocket 21A described above is provided on the side of the chain saw body 20 covered by the guard unit 30, and the saw chain 11 supported by the guide bar 10 is wound around the sprocket 21A. Further, a guide bar attitude regulating plate (plate material) 47 is attached to a pressure contact surface to which the base end portion 10A of the guide bar 10 is pressed in contact with the chain saw body 20 side. The guide bar attitude regulating plate 47 is formed with insertion holes 47A through which the stud bolts 32 are inserted and positioning holes 47B and 47B formed on both sides thereof, and further along the longitudinal direction of the guide bar 10. A convex portion 47 </ b> C (see FIG. 7B) that extends at a set angle is formed. The guide bar posture regulating plate 47 is formed by fitting the insertion holes 47A into the stud bolts 32 and fitting the positioning holes 47B and 47B to the positioning bolts 32X and 32Y (see FIG. 7A) on the chain saw body 20 side. It is attached and fixed to the chainsaw body 20.

  FIG. 7 is an explanatory view showing the operation of the guide bar posture regulating plate. As shown in FIG. 3A, a base portion 10A of the guide bar 10 has a fitted portion (long hole portion) 10R into which the convex portion 47C can be fitted along the longitudinal direction of the guide bar 10. Is formed. A stud bolt 32 and positioning bolts 32X and 32Y attached to the chainsaw body 20 are inserted into the fitted portion 10R with a gap. When the base end portion 10A of the guide bar 10 is pressed against the chain saw body 20 by the guard portion 30, the protrusion 47C is fitted to the fitted portion 10R, thereby filling the gap described above. (See FIG. 2B; FIG. 2B is a cross-sectional view taken along the line CC in FIG. 1A).

  At this time, the arrangement direction of the stud bolt 32 and the positioning bolts 32X and 32Y on the chain saw body side and the extending direction (axis O2 direction) of the convex portion 47C of the guide bar attitude regulating plate 47 fixed to them are the chainsaw body 20 Is inclined by an angle θ in the illustrated arrow Y direction (upward direction) with respect to the reference line direction (axis O1 direction). When the guide bar 10 is mounted, the fitted portion 10R formed on the base end portion 10A of the guide bar 10 is loosely fitted to the stud bolt 32 and the positioning bolts 32X and 32Y protruding from the side surface of the chain saw body 20. The guide bar 10 can be supported on the chain saw body 20 without being held by hand. At this time, the fitted portion 10R is loosely fitted to the stud bolt 32 and the positioning bolts 32X and 32Y with the tip of the guide bar 10 slightly upward. When the proximal end portion 10A of the guide bar 10 is pressed against the chain saw body 20 by the guard portion 30 by tightening the tightening knob portion 33, the convex portion 47C is fitted into the gap in the fitted portion 10R, and the stud bolt The fitted portion 10R is positioned so as to match the extending direction of the convex portion 47C along the parallel direction of the 32 and the positioning bolts 32A and 32Y, and the guide bar 10 is inclined obliquely toward the axis O2 described above. It can be restricted to an upward posture. The above-described convex portion 47C is provided on the guide bar posture regulating plate 47, but such a guide bar posture regulating plate 47 may be omitted, and the convex portion may be directly formed on the aforementioned pressure contact surface in the chain saw body 20. Is possible.

  The operation procedure and function in the guide bar mounting mechanism of the chain saw having such a structure will be described below. First, as shown in FIG. 6, the guide bar attitude regulating plate 47 is mounted and positioned on the pressure contact surface of the chain saw body 20, and the base end portion 10 </ b> A of the guide bar 10 is overlapped with the guide bar attitude regulating plate 47. Install on the side. At this time, the fitted portion (long hole portion) 10R provided at the base end portion 10A of the guide bar 10 is loosely fitted to the positioning bolts 32X and 32Y and the stud bolt 32 on the chain saw body 20 side. Even if it is not held by, it will be supported on the guide bar main body 20 side.

  Next, in a state in which the tightening knob portion 33 is screwed to the stud bolt 32, the movement operation portion (operation lever) 44 of the guard portion 30 is operated, and the chain tensioner 40 is slid to operate the chain tensioner 40. The engaging portion 40A is engaged with the engaged portion (oil hole) 10B of the guide bar 10. In this state, when the operation of the movement operation unit 44 is released, the urging force of the urging member 42 acts, and the guide bar 10 is pushed out to the distal end side. As a result, tension is always applied to the saw chain 11 with an appropriate force. In this state, since the elastic force of the elastic member 43 acts and the meshing portions 40P and 41P are separated (see FIGS. 2 and 4A), the chain tensioner is moved along the guide member 41. 40 can move smoothly.

  Next, by tightening the tightening knob portion 33 by hand, the guard portion 30 is pressed against the chain saw body 20 side. At this time, the guard portion 30 presses the base end portion 10 </ b> A of the guide bar 10 against the chain saw body 20 against the elastic force of the elastic member 43. By this tightening, the chain tensioner 40 comes into contact with the guide bar 10 and is pushed to the opposite side of the chain saw body 20, and the meshing portion 40P on the chain tensioner 40 side and the meshing portion 41P on the guide member 41 side are brought into meshing state. (See FIG. 3 and FIG. 4B). As a result, the chain tensioner 40 is fixed to the guide member 41, and the movement of the guide bar 10 in the longitudinal direction (the arrow X direction in the drawing and the opposite direction thereof) is restricted. Further, the base end portion 10 </ b> A of the guide bar 10 is pressed against the guide bar posture regulating plate 47, and the convex portion 47 </ b> C of the guide bar posture regulating plate 47 is fitted into the gap of the fitted portion 10 </ b> R of the guide bar 10. 10 is adjusted to an appropriate posture, and the movement of the guide bar 10 in the vertical direction (the arrow Y direction in the drawing and the opposite direction) is also restricted.

  Such a chain saw guide bar mounting mechanism provides the following advantages. By installing the tightening knob portion 33 on the guard portion 30, the guide bar 10 can be easily attached to the chain saw body 20 without using a tool such as a plug wrench. At that time, since the guide bar 10 is fixed to the chain saw body 20 side in the meshed state of the meshing portions 40P and 41P that do not affect the tightening force of the tightening knob portion 33, a secure fixed state can be obtained even by manual tightening, A fixed state can be realized regardless of who operates. Even if tightening is insufficient, the guide bar 10 is fixed as long as the meshing state of the meshing portions 40P and 41P is maintained, and the saw chain 11 does not loosen, so that high safety can be obtained. .

  Further, the tension of the saw chain 11 is always given automatically by the urging force of the urging member 42 in a constant state. By operating the movement operation part (operation lever) 44 of the guard part 30 to engage the engagement part 40A of the chain tensioner 40 with the engaged part (oil hole) 10B of the guide bar 10, the movement operation part 44 is engaged. Since the urging force of the urging member 42 acts only by releasing the operation, the operator can apply the necessary tension to the saw chain 11 without holding the guide bar 10 by hand. Also, when the looseness of the saw chain 11 is corrected, the urging member 42 is automatically actuated by simply loosening the one end tightening knob portion 33 so that the saw chain 11 can be retightened.

  Further, after engaging the engaging portion 40A of the chain tensioner 40 with the engaged portion 10B of the guide bar 10, the tightening knob portion 33 is tightened while the movement operation portion 44 is held at a desired position. It becomes possible to arbitrarily adjust the tension state of the saw chain 11 almost steplessly by operation. At this time, the movement operation unit 44 is moved against the urging force of the urging member 42, but the movement operation unit 44 is moved with a slight operation force by the link mechanism of the movement operation unit 44 utilizing the action of the lever. It can be moved or held. Further, by providing the guard 30 with a guard for protecting the operator's fingers from the saw chain 11 when the chain is tensioned, safety can be further improved.

  Further, the convex portion 47C is automatically fitted into the gap between the fitted portions 10R of the guide bar 10 by simply tightening the tightening knob portion 33 by hand without holding the guide bar 10 by hand. Therefore, good operability can be obtained even when the guide bar 10 is fixed while keeping the posture of the guide bar 10 in a predetermined state.

  Basically, after the base end portion 10A of the guide bar 10 is temporarily mounted on the chain saw body 10 side and the tightening knob portion 33 is screwed onto the stud bolt 32, the tightening knob portion 33 is manually tightened with one hand. The guide bar 10 can be firmly and stably attached to the chain saw body 20 with a simple operation of simply tightening the guide bar 10 while maintaining the posture of the guide bar 10 in a predetermined state.

  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. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

1: Chain saw, 10: Guide bar, 10A: Base end,
10B: engaged portion (oil hole), 10R: engaged portion (long hole portion),
11: saw chain, 20: chain saw body, 21: saw chain drive,
21A: Sprocket, 30: Guard part, 30A: Sliding base part,
30S: Thumb hanging part,
31: Handle, 32: Stud bolt, 32X, 32Y: Positioning bolt,
33: Tightening knob part
40: Chain tensioner, 40A: Engagement part, 40B: Hole part,
40P, 41P: meshing part, 41: guide member, 42: biasing member,
43: Elastic member (leaf spring), 44: Movement operation part (operation lever),
45: rocking link, 46: guide hole, 47: guide bar attitude regulating plate (plate material),
47A: insertion hole, 47B: positioning hole, 47C: convex portion

Claims (10)

A chain bar (1) guide bar mounting mechanism for mounting on a chain saw body (20) a guide bar (10) that slidably supports a saw chain (11) on its outer periphery,
Covering the base end portion (10A) of the guide bar and the drive portion (21) for driving the saw chain, and a guard portion (30) for pressing the base end portion of the guide bar against the chain saw body,
The guard part is
A chain tensioner (40) having an engaging portion (40A) that engages with an engaged portion (10B) formed at a base end portion of the guide bar;
A guide member (41) for guiding the chain tensioner along the longitudinal direction of the guide bar;
An urging member (42) for urging the chain tensioner guided along the longitudinal direction of the guide bar by the guide member in the distal direction of the guide bar;
The chain tensioner and the guide member are formed with meshing portions (40P, 41P) in which the base end portion of the guide bar is engaged with the chain saw body by the guard portion. Guide bar mounting mechanism.   The guide member is a rod-shaped member extending along the longitudinal direction of the guide bar, and the chain tensioner is formed with a hole (40B) through which the guide member is inserted, and the chain tensioner is the guide member. It is possible to move along the guide member in a loosely fitted state, and the engagement portion is formed on at least a part of both the outer peripheral surface of the guide member and the inner peripheral surface of the hole. The chain saw guide bar mounting mechanism according to claim 1.   An elastic member (43) is disposed between the chain tensioner and the guide member to separate the meshing portions from each other, and the guard portion is against the elastic force of the elastic member and the base end of the guide bar. The chain saw guide bar mounting mechanism according to claim 1 or 2, wherein the portion is pressed against the chain saw body.   The guide bar mounting mechanism for a chainsaw according to any one of claims 1 to 3, wherein the guard portion includes a tightening knob portion (33) for manually tightening screws between the chainsaw body and the guard portion. . The guard part includes a movement operation part (44) for moving the chain tensioner along the guide member,
The moving operation unit includes a swing link (45) that can swing around the screwing position, and moves the chain tensioner according to a swing operation amount of the swing link. Item 5. A chain saw guide bar mounting mechanism according to Item 4.   6. The chain saw guide bar mounting mechanism according to claim 5, wherein a finger hooking surface (44a) on which an index finger of an operator is hung is formed in the moving operation portion.   The chain saw guide bar mounting mechanism according to claim 5 or 6, wherein the guard portion is formed with a thumb hanging portion (30S) for hanging an operator's thumb.   A convex surface (47C) extending at an angle set along the longitudinal direction of the guide bar is formed on the pressure contact surface to which the base end portion of the guide bar on the chain saw body side is pressed, At the base end portion of the guide bar, a fitted portion (10R) into which the convex portion can be fitted is formed along the longitudinal direction of the guide bar, and the base end portion of the guide bar is formed by the guard portion. The pressure of the guide bar is regulated by fitting the convex part to the fitted part when the chain is pressed against the chain saw body. Chainsaw guide bar mounting mechanism described.   The said convex part is formed in the board | plate material (47) arrange | positioned between the to-be-contacted surface of the said chainsaw main body, and the base end part of the said guide bar, The chain saw of Claim 8 characterized by the above-mentioned. Guide bar mounting mechanism. A guide bar (10) that slidably supports a saw chain (11) on the outer periphery, a chain saw body (20) to which the guide bar is detachably mounted, and a base end portion (10A) of the guide bar are A chainsaw (1) provided with a guard part (30) pressed against the chain saw body,
The guard part is
A chain tensioner (40) having an engaging portion (40A) that engages with an engaged portion (10B) formed at a base end portion of the guide bar;
A guide member (41) for guiding the chain tensioner along the longitudinal direction of the guide bar;
An urging member (42) for urging the chain tensioner guided along the longitudinal direction of the guide bar by the guide member in the distal direction of the guide bar;
The chain tensioner and the guide member are formed with meshing portions (40P, 41P) that engage with the guard portion in a state where the base end portion of the guide bar is in pressure contact with the chain saw body.

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