JP2019171660A - Chain saw - Google Patents

Abstract

To easily divide a main body casing into a left half part and a right half part in a chain saw, in which the main body casing integrally provided with a top handle is provided by dividably joining the left half part and the right half part, and a left leg part and a right leg part of a hand guard are attached to the left half part and the right half part of the main body casing on left and right both sides of the top handle.SOLUTION: A hand guard 20 provided to a front part of a main body casing 11 of a chain saw 10 includes: a guard part 21 arranged on a front side of a side handle 13; a right leg part 22 connected to a right half part 11a of the main body casing 11 from the guard part 21; and a left leg part 23 connected to a left half part 11b of the main body casing 11 from the guard part 21. The right leg part 22 and the left leg part 23 are so arranged as to sandwich a top handle 12. The right leg part 22 is connected to a brake mechanism 40. The left leg part 23 is provided with a first joint part 23a being the guard part 21 side and a second joint part 23b being the main body casing 11 side. The second joint part 23b is made to support the first joint part 23a while rotation around a horizontal axis is allowed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a chainsaw.

  Patent Document 1 discloses an invention of a chainsaw. This chain saw is provided with a prime mover housed in a main body casing, a guide bar provided so as to protrude forward from the main body casing, and is rotatably stretched along the outer periphery of the guide bar. A saw chain that rotates along the outer periphery of the main body casing, a top handle provided to extend back and forth at the top of the main casing, a side handle provided at the front of the main casing, and a front and rear at the front of the main casing. And a hand guard rotatably provided.

  The hand guard protects the operator's hand holding the side handle and operates a brake mechanism for stopping the rotation of the saw chain when the hand guard is rotated forward. The hand guard has a guard part arranged on the front side of the side handle, a right leg part that extends from the guard part to the right side of the front handle and is attached to the right side part of the main body casing, and extends from the guard part to the left side of the front handle. And a left leg attached to the left side of the main casing. Further, the right leg portion of the hand guard is connected to the brake mechanism in the main body casing, and when the hand guard is rotated forward, the rotation of the saw chain is stopped by the operation of the brake mechanism.

JP 2014-159162 A

  In this type of chainsaw, in order to perform maintenance of the prime mover housed in the main body casing, there is one in which the main body casing is connected so as to be divided into a left half portion and a right half portion. In addition, there is a type in which a top handle provided at an upper portion of the main body casing is provided integrally with the main body casing, and the top handle is integrally connected to the main body casing so as to be divided into a left half portion and a right half portion. When the chain saw of Patent Document 1 includes the top handle and the left half and the right half of the main casing are connected so as to be split, if the main casing is divided into the left and right together with the top handle, Although the left leg portion is easily attached from the main body casing, the right leg portion of the hand guard is connected to the brake mechanism in the main body casing, so that it is difficult to remove the hand guard from the main body casing. For this reason, if the left half and the right half of the main casing are moved to the left and right in opposite directions, the right leg remains attached to the right half of the main casing. The left half of the half is restricted to move to the left by the left leg, and the main body casing can be opened only at a narrow interval, and there is a possibility that the prime mover inside the main body casing cannot be maintained. In the present invention, a main body casing integrally provided with a top handle is connected so that a left half portion and a right half portion can be divided, and the left leg portion and the right leg portion of the hand guard are sandwiched between the top handle and the left side of the main body casing. An object of the present invention is to make it easier to divide a left half and a right half of a main casing in a tune saw attached to a half and a right half.

  In order to solve the above-described problems, the present invention is provided with a prime mover housed in a main body casing, a guide bar provided so as to protrude forward from the main body casing, and rotatably stretched along the outer periphery of the guide bar. A saw chain that rotates along the outer periphery of the guide bar by the operation of the prime mover, a top handle provided to extend back and forth at the top of the main body casing, a side handle provided on a side portion of the main body casing, A brake mechanism is provided at the front part of the main body casing so as to be able to rotate back and forth, and protects the hand of the operator holding the side handle and stops the rotation of the saw chain when rotated forward. A chain saw having a hand guard for operating the top handle, wherein at least the front part of the top handle is integrally provided on the upper part of the main body casing. The main casing, in which at least the front part of the top handle is integrally provided, has a left half part and a right half part that are separably connected, and the hand guard is disposed on the front side of the side handle and is gripped. A guard part for protecting the hand, a left leg part that extends from the guard part to the left side of the top handle and is connected to the left half of the main casing, and a right part of the main casing that extends from the guard part to the right side of the top handle. A right leg part connected to the half part, and the left leg part and the right leg part are arranged so as to sandwich the front part of the top handle, and one of the left leg part and the right leg part is located inside the main body casing. The other of the left leg portion and the right leg portion is connected to the brake mechanism, and includes a first joint portion on the guard portion side and a second joint portion on the main body casing side, and the second joint portion as the first joint portion. Specially supported for rotation around a horizontal axis. It is to provide a chain saw to be.

  In the chainsaw configured as described above, when maintaining parts such as a prime mover housed in the main body casing, when the left half and the right half of the main body casing are moved in opposite directions in the left-right direction, The movement of the left half and right half of the main casing, which has at least the front part of the top handle, is restricted to the other of the left and right leg parts of the hand guard that is not connected to the brake mechanism. There is a possibility that the left half and the right half of the main casing can be opened only at a narrow interval. On the other hand, in this chainsaw, the other of the left leg portion and the right leg portion is provided with a first joint portion on the hand guard side and a second joint portion on the body casing side, and the second joint portion is the first joint portion. And supported so as to be rotatable around a horizontal axis. By rotating the other second joint part of the left leg part and the right leg part around the horizontal axis to a position where the movement of the top handle is not restricted, the second joint part is moved between the left half part and the right half part of the main body casing. The movement of the other side is not restricted, and the main body casing can be divided into a left half part and a right half part at a wide interval so that the inside can be opened.

  In the chain saw configured as described above, a protrusion projecting outward in the left-right direction is provided at the tip of the second joint of the other of the left leg and the right leg, and the position facing the protrusion of the main casing. It is preferable to provide an engaging recess that is detachably engaged with the protrusion.

It is a right view of the chainsaw of this invention. It is a left view of the chain saw of FIG. It is a top view of the chain saw of FIG. It is a front view of the chainsaw of FIG. It is a right view of the state which removed the sprocket cover from the main body casing (saw chain is omitted). FIG. 6 is a right side view of the state where the guide bar and the brake cover are removed from FIG. 5.

  Hereinafter, an embodiment of a chain saw of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the chainsaw 10 includes a main body casing 11, an electric motor (prime mover) 30 housed in the main body casing 11, and a guide bar provided so as to protrude forward from the main body casing 11. 33, a saw chain 34 that is rotatably stretched along the outer periphery of the guide bar 33, and a hand guard 20 that is rotatably disposed at the front portion of the main body casing 11.

  As shown in FIGS. 1 to 4, the main body casing 11 has a right half portion 11 a and a left half portion 11 b that are detachably connected. The right half portion 11 a constitutes the right outer shell of the main body casing 11. The left half 11 b constitutes the left outer shell of the main casing 11. Parts such as the electric motor 30 provided in the main body casing 11 can be maintained by dividing the right half 11a and the left half 11b.

  As shown in FIGS. 1 to 4, a top handle 12 extending in the front-rear direction is provided on the upper portion of the main body casing 11, and a side handle 13 is provided in an intermediate portion in the front-rear direction from the front portion of the main body casing 11. The top handle 12 is provided integrally with the main body casing 11, the right half 12a of the top handle 12 is formed integrally with the right half 11a of the main body casing 11, and the left half 12b of the top handle 12 is the main body. It is formed integrally with the left half portion 11 b of the casing 11. Similarly to the half portions 11a and 11b of the main body casing 11, the top handle 12 is formed by connecting the right half portion 12a and the left half portion 12b so as to be split. A trigger switch 14 is provided on the lower surface of the front portion of the top handle 12, and the trigger switch 14 operates the electric motor 30 by an on operation. The side handle 13 has a substantially U shape that is opened to the side of the main body casing 11 and tilted sideways, and is provided so as to protrude outward from the left side surface (the other side surface) of the main body casing 11.

  As shown in FIGS. 3 and 4, a recess 11c is formed on the outer side (left side) of the left half 12b of the top handle 12 at the front of the left half 11b of the main body casing 11. The left leg 23 of the guard 20 is detachably attached. A support plate portion 11d that rotatably supports a left leg portion 23 of a hand guard 20 to be described later is provided on the outside (left side) of the recess 11c of the main body casing 11, and the left leg portion 23 is provided on the support plate portion 11d. An engaging recess 11e is formed in which the protrusion 23d at the tip of the detachably engages. The width in the left-right direction of the recess 11c is longer than the sum of the width in the left-right direction of the left leg 23 of the hand guard 20 and the length of the protrusion 23d, and the protrusion 23d of the left leg 23 is engaged with the engagement recess. It is possible to move left and right in the recess 11c from the position 11e to the position where it is detached.

  As shown in FIGS. 1 to 4, a hand guard 20 is provided at the front portion of the main body casing 11 so as to be able to rotate back and forth. The hand guard 20 protects the operator's hand holding the side handle 13 and activates a brake mechanism 40 that stops the rotation of the saw chain 34 when rotated forward. The hand guard 20 includes a guard portion 21 disposed on the front side of the side handle 13, and a right leg extending from the guard portion 21 to the right side of the front portion 12 c of the top handle 12 and coupled to the right half portion 11 a of the main body casing 11. And a left leg portion 23 that extends from the guard portion 21 to the left side of the front portion 12 c of the top handle 12 and is connected to the left half portion 11 b of the main body casing 11. The right leg portion 22 is formed integrally with the guard portion 21 and is connected to a brake mechanism 40 described later in the main body casing 11.

  2 and 4, the left leg portion 23 includes a first joint portion 23a on the guard portion 21 side and a second joint portion 23b on the main body casing 11 side opposite to the first joint portion 23a. I have. The first joint part 23 a is formed integrally with the guard part 21. The second joint portion 23b is supported on the first joint portion 23a by a connecting pin 23c so as to be rotatable about a horizontal axis. A protrusion 23d protruding outward (left side) is formed at the distal end of the second joint 23b, and the protrusion 23d is an engagement recess 11e formed in the support plate 11d of the left half 11b of the main body casing 11. Are engaged so as to be rotatable about a horizontal axis. As described above, the hand guard 20 is rotatably supported by the respective half portions 11 a and 11 b of the main body casing 11 by the right leg portion 22 and the left leg portion 23.

  As shown in FIG. 1, an electric motor 30 is housed in the middle part of the main body casing 11 in the front-rear direction, and the electric motor 30 supplies power from a battery pack 31 that is detachably attached to the rear part of the main body casing 11. Receive and operate. The output shaft 30 a of the electric motor 30 protrudes outward from the right half portion 11 a constituting the right side surface of the main body casing 11. As shown in FIGS. 1, 5, and 6, a sprocket 32 is attached to the output shaft 30 a of the electric motor 30. A base end portion of a plate-shaped guide bar 33 protruding forward is detachably attached to the front portion of the right side surface of the main casing 11. A saw chain 34 is stretched between the outer periphery of the guide bar 33 and the sprocket 32, and the saw chain 34 rotates on the outer periphery of the guide bar 33 by the rotation of the sprocket 32. A sprocket cover 15 is detachably provided at the middle part before and after the front part of the right side surface of the main casing 11. The sprocket cover 15 covers the base end parts of the sprocket 32 and the guide bar 33.

  FIG. 6 is a right side view of the main casing 11 with the sprocket cover 15, the guide bar 33, and the saw chain 34 removed from the right half 11 a and the brake cover 16 removed. A brake mechanism 40 is built in the main body casing 11. The brake mechanism 40 includes a brake drum 41 attached to the output shaft 30 a of the electric motor 30, a brake shoe 42 provided outside the brake drum 41, and the brake shoe 42 and the tip of the right leg portion 22 of the hand guard 20. And a link 43 to be connected. As shown in FIG. 6, when the guard portion 21 of the hand guard 20 is in the upright position, the brake shoe 42 expands outside the brake drum 41 and is separated from the brake drum 41. At this time, the output shaft 30 a of the electric motor 30 to which the brake drum 41 is attached is not braked by the brake mechanism 40. On the other hand, when the guard portion 21 of the hand guard 20 is rotated forward, the link 43 is moved forward by the rotation of the tip portion of the right leg portion 22, and the brake shoe 42 is moved to the outer periphery of the brake drum 41 by the link 43. The diameter is reduced so as to contact the surface. In this state, the rotation of the output shaft 30a is braked by the frictional force between the brake drum 41 and the brake shoe 42, and the saw chain 34 follows the outer periphery of the guide bar 33 as the sprocket 32 attached to the output shaft 30a stops rotating. The rotation stops.

  When the chain saw 10 configured as described above is used, when the operator holds the top handle 12 with the right hand, holds the side handle 13 with the left hand, and operates the trigger switch 14 provided on the top handle 12 with the finger of the right hand. The electric motor 30 is operated by receiving power from the battery pack 31. The sprocket 32 is rotated by the operation of the electric motor 30, and the saw chain 34 is rotated along the outer periphery of the guide bar 33 by the rotating sprocket 32. When the operator presses the guide bar 33 on which the saw chain 34 rotates against the tree branch, the tree branch is cut by the saw chain 34 rotating along the outer periphery of the guide bar 33.

  When maintaining the parts such as the electric motor 30 inside the chainsaw 10, the screws fixing the right half 11a and the left half 11b of the main casing 11 are removed, and the right half 11a and the left half of the main casing 11 are removed. 11b needs to be divided. In the chain saw 10, a top handle 12 is integrally provided on the upper portion of the main body casing 11, and the main body casing 11 provided with the top handle 12 (12a, 12b) is integrally provided with a right half portion 11a and a left side. The half part 11b is connected so that it can be divided. Further, the right leg portion 22 and the left leg portion 23 of the hand guard 20 are arranged so as to sandwich the top handle 12, and the right leg portion 22 of the hand guard 20 extends to the right side of the front portion 12 c of the top handle 12 and is a main body casing. 11, the left leg 23 of the hand guard 20 extends to the left of the front portion 12c of the top handle 12 and is connected to the left half 11b of the main body casing 11. Further, since the right leg portion 22 of the hand guard 20 is connected to the link 43 and the coil pulling 44 of the brake mechanism 40, the right leg portion 22 of the hand guard 20 can be easily detached from the right half portion 11a of the main body casing 11. I can't. For this reason, when the right half part 11a and the left half part 11b of the main body casing 11 are moved in the opposite directions in the left-right direction, as shown by the two-dot chain line in FIG. The left half 12b of the integrally provided top handle 12 is restricted from moving to the left by the left leg 23 of the hand guard 20, and the right half 11a and the left half 11b of the main casing 11 are narrowly spaced (see FIG. There is a possibility that it can be opened only with 4).

  On the other hand, in the chainsaw 10, the left leg portion 23 of the hand guard 20 includes a first joint portion 23a on the guard portion 21 side and a second joint portion 23b on the main body casing 11 side, and the second joint portion. 23b was supported by the first joint portion 23a so as to be rotatable about a horizontal axis. Further, the second joint portion 23b is provided with a protrusion 23d protruding outward (left side), and the left half 11b of the main casing 11 is detachably engaged with the protrusion 23d at a position facing the protrusion 23d. An engaging recess 11e is provided. As shown by the two-dot chain line in FIG. 4, when the left half portion 11b of the main body casing 11 is moved to the left side slightly longer than the protruding length of the protruding portion 23d, the protruding portion 23d is detached from the engaging recess 11e. In this state, as shown by a two-dot chain line in FIG. 2, when the second joint portion 23 b of the left leg portion 23 of the hand guard 20 is rotated forward, the left half portion 12 b of the top handle 12 is moved to the hand guard 20. The movement of the left leg 23 of the main body casing 11 is not described, and the right half 11a and the left half 11b of the main body casing 11 are completely separated from each other, so that the parts such as the electric motor 30 inside the main body casing 11 can be maintained. I was able to do that.

  In the chainsaw 10 configured as described above, the right leg portion 22 is connected to the brake mechanism 40, and the left leg portion 23 is a first joint portion 23a on the guard portion 21 side and a second joint portion on the main body casing 11 side. 23b, the second joint portion 23b is supported by the first joint portion 23a so as to be rotatable about the horizontal axis. However, the present invention is not limited to this, and the left leg portion 23 is braked. The right leg portion 22 is connected to the mechanism 40, and the right leg portion 22 includes a first joint portion on the guard casing 21 side and a second joint portion on the main body casing 11 side, and the second joint portion becomes the first joint portion. It may be supported so as to be rotatable around a horizontal axis.

  In the chain saw 10 configured as described above, the top handle 12 is integrally provided on the upper portion of the main body casing 11, and the entire right half portion 12 a of the top handle 12 is integrally formed with the right half portion 11 a of the main body casing 11. The entire left half portion 12b of the top handle 12 is integrally provided on the left half portion 11b of the main body casing 11, but the present invention is not limited to this, and the main casing 11 When the top handle 12 is integrally provided on the upper part, at least the front part of the right half 12a of the top handle 12 is integrally provided on the right half 11a of the main body casing 11, and the main body casing 11 is provided. When the left half portion 11b of the top handle 12 is integrally provided with at least the front portion of the left half portion 12b of the top handle 12, an effect can be obtained. It is those that can.

  In the chain saw 10 configured as described above, the electric motor 30 is used as a prime mover for rotating the saw chain. However, the present invention is not limited to this, and an engine composed of an internal combustion engine is used as the prime mover for rotating the saw chain. May have been.

 DESCRIPTION OF SYMBOLS 10 ... Chain saw, 11 ... Main body casing, 11a ... Right half part, 11b ... Left half part, 11e ... Engagement recessed part, 12 ... Top handle, 12a ... Right half part, 12b ... Left half part, 13 ... Side handle, 20 ... hand guard, 21 ... guard part, 22 ... right leg part, 23 ... left leg part, 23a ... first joint part, 23b ... second joint part, 23d ... projection part.

Claims (2)

A prime mover housed in the body casing;
A guide bar provided so as to protrude forward from the main body casing;
A saw chain that is rotatably arranged along the outer periphery of the guide bar and rotates along the outer periphery of the guide bar by the operation of the prime mover;
A top handle provided to extend back and forth at the top of the main body casing;
A side handle provided on a side portion of the main body casing;
In order to protect the operator's hand gripping the side handle, and to stop the rotation of the saw chain when it is rotated forward, provided in the front part of the main body casing so as to be able to rotate back and forth. A chain saw with a hand guard for operating the brake mechanism of
At least the front part of the top handle is integrally provided at the upper part of the main body casing, and the main body casing in which at least the front part of the top handle is integrally provided has a left half part and a right half part. It is concatenated so that it can be divided.
The hand guard is disposed on the front side of the side handle and protects a gripped hand, and a left leg extending from the guard portion to the left side of the top handle and connected to the left half of the main casing. And a right leg portion extending from the guard portion to the right side of the top handle and connected to the right half of the main body casing, and the left leg portion and the right leg portion of the top handle It is arranged to sandwich the front part,
One of the left leg and the right leg is connected to the brake mechanism in the main body casing, and the other of the left leg and the right leg is the first joint that is on the guard part side, A chain saw comprising: a second joint portion on a main casing side, wherein the second joint portion is supported by the first joint portion so as to be rotatable about a horizontal axis. The chainsaw according to claim 1,
A protrusion projecting outward in the left-right direction is provided at the tip of the second joint of the other of the left leg and the right leg, and the protrusion is located at a position facing the protrusion of the main body casing. A chain saw characterized in that an engagement recess is provided to be detachably engaged with the chain saw.

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