Chain saw

Abstract

To provide a chain saw capable of more efficiently removing chips carried into a body part by a saw chain.SOLUTION: According to one aspect of the present invention, there is provided a chain saw including a main body, wherein the main body includes a guide bar, a saw chain, a drive sprocket, and a guide wall, the saw chain is wound around the guide bar and the drive sprocket, and the drive sprocket is disposed behind the guide bar, has a rotation axis in a left-right direction of the main body, and is configured to rotate to move the saw chain along the guide bar, the guide wall includes a first wall portion and a second wall portion, the first wall portion is a wall portion provided in an arc shape along the drive sprocket and disposed with a predetermined gap from the saw chain, the second wall section extends rearward from the first wall section with a connecting section therebetween, and when viewed from the left-right direction, the angle formed by a first direction, which passes through the center of the rotation axis and extends in the vertical direction of the body section, and a second direction, which passes through the center of the rotation axis and the apex of the connecting section, is 0 ° to 30 ° inclusive.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a chain saw. [Background technology]

[0002] Patent Document 1 discloses a configuration in which a through hole that penetrates a rim sprocket is provided to assist in removing wood chips during wood cutting operations. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2008-514454 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional technology disclosed in Patent Document 1 still has room for improvement.

[0005] In view of the above circumstances, the present invention provides a chain saw that can more efficiently remove chips carried into the main body by the saw chain. [Means for solving the problem]

[0006] According to one aspect of the present invention, there is provided a chainsaw comprising a main body having a guide bar, a saw chain, a drive sprocket, and a guide wall, the saw chain being looped around the guide bar and the drive sprocket, the drive sprocket being arranged behind the guide bar and having a rotation axis in the left-right direction of the main body, and being configured to rotate to move the saw chain along the guide bar, the guide wall comprising a first wall and a second wall, the first wall being arranged in an arc shape along the drive sprocket and being arranged with a predetermined gap between it and the saw chain, the second wall being a wall extending rearward via a connection to the first wall, and when viewed from the left-right direction, the angle formed by a first direction passing through the center of the rotation axis and along the up-down direction of the main body and a second direction passing through the center of the rotation axis and the apex of the connection is between 0° and 30°.

[0007] According to this aspect, chips carried into the inside of the main body by the saw chain can be removed more efficiently. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a right side view showing the appearance of the chain saw. [Figure 2] FIG. 2 is a left side view showing the appearance of the chain saw. [Figure 3] FIG. 2 is a top view showing the chainsaw with some parts omitted. [Figure 4] FIG. 2 is an enlarged perspective view illustrating an opening, as viewed from below and behind the chainsaw. [Figure 5] 4 is a diagram illustrating the angle θ1 when the main body is viewed from the right side in the state shown in the AA cross section of FIG. 3. FIG. [Figure 6] 4 is a diagram illustrating the angle θ2 when the main body is viewed from the right side in the state shown in the AA cross section of FIG. 3. FIG. [Figure 7] FIG. 2 is a left side view showing the appearance of the sprocket cover. [Figure 8]4 is a view for explaining a predetermined gap, showing the main body section in the state shown in cross section AA in FIG. 3, as viewed from the right side. FIG. [Figure 9] 4 is a view for explaining an example of a state of use, showing the main body portion in the state shown in cross section AA in FIG. 3, as viewed from the right side. FIG. [Figure 10] 10 is a photograph showing the discharge state of chips CW transported inside the main body in an embodiment. [Figure 11] 10 is a photograph showing the discharge state of chips CW transported inside the main body in Comparative Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. Various features shown in the following embodiment can be combined with each other.

[0010] 1. Overall structure Chapter 1 describes a chainsaw 1 according to one embodiment. The chainsaw 1 is a work machine for cutting, processing, etc. (hereinafter simply referred to as "cutting, etc.") a work object such as a tree or branch (hereinafter simply referred to as "work object"), and is powered by, for example, a motor or an engine. The following describes a chainsaw 1 that uses a motor as its power source.

[0011] FIG. 1 is a right side view showing the appearance of the chainsaw. FIG. 2 is a left side view showing the appearance of the chainsaw. FIG. 3 is a top view showing the chainsaw with some parts omitted. FIG. 4 is an enlarged perspective view of the chainsaw from below and rearward to explain the opening. FIG. 5 is a view showing the main body in the state shown in the A-A cross section shown in FIG. 3 as viewed from the right side to explain the angle θ1. FIG. 6 is a view showing the main body in the state shown in the A-A cross section shown in FIG. 3 as viewed from the right side to explain the angle θ2. FIG. 7 is a left side view showing the appearance of the sprocket cover. FIG. 8 is a view showing the main body in the state shown in the A-A cross section shown in FIG. 3 as viewed from the right side to explain the predetermined gap.

[0012] In the following description, the directions of the chainsaw 1 and the components that make up the chainsaw 1 are defined based on the terms "upper," "lower," "left," "right," "front," and "rear" shown in Figures 1 to 8 (as well as Figure 9). Furthermore, in the following description, "upper" will also be referred to as "upper side" or "upper direction," and "lower" will also be referred to as "lower side" or "lower." The direction formed by "upper" and "lower" will also be referred to as "upper / lower" or "upper / lower direction." The same applies to "left," "right," "front," and "rear."

[0013] The chainsaw 1 shown in Figures 1 and 2 is a small chainsaw known as a top-handle saw. This chainsaw 1 includes a main body 2 and a battery 8. The main body 2 includes a working unit 3, a handle 4, a housing 5, and a motor 6 and a control unit 7 housed in the housing 5.

[0014] (Working Section 3) The working unit 3 is configured to cut or otherwise perform work on an object, and is configured to be connected to the housing 5. In the configuration shown in the figure, the working unit 3 is a chain cutter, and includes a guide bar 31, a saw chain 32, and a drive sprocket 33. In other words, the working unit 3, which is part of the main body 2, includes the guide bar 31, the saw chain 32, and the drive sprocket 33.

[0015] 1 and 2, the guide bar 31 is a plate-shaped member extending in the front-rear direction, and the rear end of the guide bar 31 is attached to the front right part of the housing 5. As shown in FIG. 5, the guide bar 31 is disposed in front of the drive sprocket 33, and a saw chain 32 is wound around the outer periphery of the guide bar 31 and the drive sprocket 33.

[0016] The saw chain 32 is configured in an annular shape and has a blade on its outer periphery for cutting a work object, etc. In the illustrated state, the saw chain 32 is engaged with the guide bar 31 at the front end side of the guide bar 31, and is engaged (meshed) with a drive sprocket 33 connected to the rotating shaft 61 of the motor 6 at the rear end side of the guide bar 31. In other words, the saw chain 32 is wound around the guide bar 31 and the drive sprocket 33. Furthermore, the saw chain 32 is configured to rotate along the outer periphery of the guide bar 31 and the drive sprocket 33 when the drive sprocket 33 rotates due to the rotational power generated by the motor 6.

[0017] The drive sprocket 33 is generally disk-shaped and has a plurality of protrusions (teeth) 33c that protrude outward from its outer periphery. The tips of the protrusions 33c are configured to engage (mesh) with a portion of the saw chain 32. The drive sprocket 33 also has a shaft hole 33b in the center of the generally disk-shaped sprocket.

[0018] The drive sprocket 33 has a rotation shaft 33a at the center of the shaft hole 33b. The rotation shaft 33a is disposed behind the guide bar 31 and aligned in the left-right direction of the main body 2.

[0019] The shaft hole 33b is fitted with the rotating shaft 61 of the motor 6. This allows the drive sprocket 33 to rotate due to the rotational power generated by the motor 6. As shown in FIG. 5, the shaft hole 33b and the rotating shaft 61 are specifically configured to have flat surfaces at the front and rear in the figure, preventing the rotating shaft 61 from rotating within the shaft hole 33b. As the drive sprocket 33 rotates (rotating clockwise in FIG. 5), it sequentially engages with the saw chain 32 at its lower front, while sequentially disengaging from the saw chain 32 at its upper front. With this configuration, the drive sprocket 33 moves the saw chain 32 along the guide bar 31 as it rotates. Note that the shaft hole 33b and the rotating shaft 61 may be configured with any mechanism capable of transmitting rotational power, such as a spline mechanism or a key and keyway mechanism.

[0020] (Handle 4) 1 and 2, the handle 4 has a top handle 41 provided above the housing 5 and a side handle 42 provided on the left side of the housing 5. An operator performs work by holding the top handle 41 and the side handle 42 with each hand.

[0021] (Top handle 41) The top handle 41, which is the handle 4, is disposed above the housing 5. The top handle 41 is formed contiguous with the top surface of the housing 5 and extends in the front-to-rear direction above the housing 5. The front side of the top handle 41 is fixed to a front end 53 of the housing 5 that protrudes upward from the housing 5. A drive switch (not shown) is provided inside the front end 53 of the housing 5. This drive switch controls the operation of the working unit 3. Specifically, the drive switch controls the rotation speed of the motor 6 according to the amount of depression of the head, thereby increasing or decreasing the rotation speed of the saw chain 32. The rear side of the top handle 41 is fixed to a battery attachment / detachment part 54 of the housing 5. When the battery 8 is attached to the battery attachment / detachment part 54, the upper end of the battery 8 protrudes above the rear end of the top handle 41.

[0022] A grip portion 411 extending in the front-to-rear direction is provided between the front end and rear end of the top handle 41. The grip portion 411 is inclined slightly downward from the front end to the rear end of the top handle 41. The grip portion 411 is the part that an operator holds when holding the chainsaw 1. The operator's hand is inserted into the space between the grip portion 411 and the top surface of the housing 5.

[0023] A trigger lever 412 is disposed on the underside of the front end of the grip part 411 as an operating means for increasing or decreasing the rotation speed of the saw chain 32. In other words, the trigger lever 412 is configured to control the operation of the working unit 3 via a drive switch (not shown). The operator can operate the trigger lever 412 while holding the grip part 411.

[0024] Furthermore, a lockout lever 413 is provided on the upper surface of the grip portion 411 so as to be displaceable relative to the trigger lever 412. Specifically, the lockout lever 413 is disposed so as to be able to freely protrude and retract from the grip portion 411 (top handle 41). When an operator grips the grip portion 411, the lockout lever 413 is pushed by the palm of the operator and retracts into the grip portion 411. The lockout lever 413 and the trigger lever 412 are operatively connected within the grip portion 411 so that the trigger lever 412 can be operated for the first time. With this configuration, an operation mechanism is formed by the trigger lever 412 and the lockout lever 413, both of which are provided on the grip portion 411 (top handle 41). By operating this operation mechanism, the operation of the working unit 3 can be controlled, i.e., the rotation speed of the saw chain 32 can be increased or decreased.

[0025] (Horizontal handle 42) The side handle 42 extends in the front-to-rear direction from the front end to the rear end on the left side of the housing 5. The side handle 42 may be made of resin, or may be formed by bending a lightweight metal pipe. The front end of the side handle 42 is attached to the left side of the front end of the top handle 41. The rear end of the side handle 42 is located rearward and downward of the housing 5 and is attached to the left wall of the battery attachment / detachment section 54. The portion between the front and rear ends of the side handle 42 is curved so as to bulge outward from the left side of the housing 5 (see FIG. 3).

[0026] (Case 5) The housing 5 is a resin box that houses mechanical and electrical devices that operate the chainsaw 1. As shown in Fig. 2, specifically, the housing 5 houses a motor 6 and a control unit 7. The housing 5 also has a battery attachment / detachment section 54 to which a battery 8 can be attached / detached.

[0027] As shown in FIG. 1, the battery attachment / detachment section 54 has a cylindrical shape extending from the bottom to the top. The battery attachment / detachment section 54 is formed at the rear of the housing 5 and is inclined so that its lower portion is positioned further forward than its upper portion. The battery attachment / detachment section 54 is provided with a metal connection terminal (not shown). The connection terminal is electrically connected to the motor 6 and the control unit 7. When the connection terminal of the battery attachment / detachment section 54 is connected to the connection terminal of the battery 8, power is supplied from the battery 8 to the motor 6 and the control unit 7.

[0028] 3, the housing 5 is made up of a left cover 51 and a right cover 52, and can be separated in the left-right direction. The left cover 51 and the right cover 52 are joined together to form a space for accommodating the motor 6 and the control unit 7.

[0029] Furthermore, as shown in FIG. 4, a sprocket cover 55 is detachably attached to the right side surface of the right cover 52. In other words, the main body 2 is provided with the sprocket cover 55. The sprocket cover 55 is a box-shaped member configured to cover the components arranged in the main body 2. Specifically, as shown in FIG. 5, on the right side of the right cover 52, there are arranged the rotating shaft 61 of the motor 6 protruding to the right from the right cover 52, the drive sprocket 33 fitted to the tip of the rotating shaft 61, the guide bar 31 arranged in front of the drive sprocket 33, and the saw chain 32 wound around the guide bar 31 and the drive sprocket 33. The sprocket cover 55 is arranged on the main body 2 so as to cover the rotating shaft 61, the drive sprocket 33, part of the saw chain 32, and part of the guide bar 31.

[0030] 4, the main body 2 has an opening 56 that opens downward when the sprocket cover 55 is attached to the right cover 52. The opening 56 communicates with the space in which the drive sprocket 33 is disposed and also opens downward from the main body 2.

[0031] The sprocket cover 55, which is part of the main body 2, has a guide wall W. As shown in FIG. 7, specifically, the sprocket cover 55 has the guide wall W on the surface facing the drive sprocket 33. As shown in FIGS. 5 and 7, the guide wall W includes a first wall portion W1 and a second wall portion W2. The guide wall W may be provided on the housing 5. The guide wall W may be formed by the housing 5 and the sprocket cover 55 by attaching the sprocket cover 55 to the housing 5.

[0032] As shown in FIG. 5, the first wall W1 is a wall formed behind the drive sprocket 33 and the saw chain 32. The first wall W1 is also formed along the rear end portion of the saw chain 32 that is wound around the drive sprocket 33. As shown in FIG. 8, specifically, a predetermined gap G is provided between the first wall W1 (connection portion CP) and the saw chain 32, and the first wall W1 is designed to prevent contact between the saw chain 32 and the first wall W1. In other words, the first wall W1 is a wall that is provided in an arc shape along the drive sprocket 33 and is disposed with the predetermined gap G from the saw chain 32. The predetermined gap G shown in FIG. 8 is 6 mm. More specifically, the predetermined gap G may be 3 mm or more and 20 mm or less, preferably 4 mm or more and 15 mm or less, and more preferably 5 mm or more and 10 mm or less. Specifically, for example, the predetermined gap G is 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, or 20 mm, and may be within a range between any two of the numerical values ​​exemplified here.

[0033] The predetermined gap G may also be determined according to the size of the outer diameter R of the saw chain 32 wound around the drive sprocket 33. Here, the outer diameter R is the length from the center of the rotary shaft 33a to the outer periphery of the saw chain 32 wound around the drive sprocket 33. Specifically, the predetermined gap G may be determined at a predetermined ratio to the outer diameter R (i.e., the value obtained by dividing the value of the predetermined gap G by the value of the outer diameter R). The predetermined ratio shown in FIG. 8 is 0.2. In more detail, the predetermined ratio may be 0.1 or more and 0.8 or less, preferably 0.13 or more and 0.5 or less, and more preferably 0.16 or more and 0.3 or less. Specifically, for example, the predetermined ratios are 0.1, 0.12, 0.14, 0.16, 0.18, 0.2, 0.22, 0.24, 0.26, 0.28, 0.3, 0.32, 0.34, 0.36, 0.38, 0.4, 0.42, 0.44, 0.46, 0.48, 0.5, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, and may be within a range between any two of the numerical values ​​exemplified here.

[0034] As shown in FIG. 5, the second wall portion W2 is a wall portion formed on the rear lower side of the drive sprocket 33 and the saw chain 32 and below the first wall portion W1. The second wall portion W2 extends rearward from the first wall portion W1 via a connection portion CP. In other words, the first wall portion W1 and the second wall portion W2 are connected via the connection portion CP. The position of the connection portion CP, i.e., the position where the first wall portion W1 and the second wall portion W2 are connected, may be determined based on the relative positions of the drive sprocket 33 and the saw chain 32. Specifically, when viewed from the left-right direction (e.g., when viewed from the right side as shown in FIG. 5), the position of the connection portion CP may be determined by an angle θ1 formed between a first direction D1 that passes through the center of the rotation shaft 33a and follows the up-down direction of the main body 2 and a second direction D2 that passes through the center of the rotation shaft 33a and the apex of the connection portion CP. Specifically, as shown in FIG. 5, the angle θ1 may be 19°. Specifically, the angle θ1 between the first direction D1 and the second direction D2 is preferably 0° or more and 30° or less, more preferably 10° or more and 25° or less, and more preferably 15° or more and 22° or less. Specifically, for example, the angle θ1 is 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87 7.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5, 28, 28.5, 29, 29.5, 30°, and may be within a range between any two of the values ​​exemplified here.

[0035] According to this embodiment, chips (especially long-fiber chips) carried inside the main body 2 by the saw chain 32 can be removed from the saw chain 32 by the guide wall W, and the chips can be discharged outside the main body 2 along the second wall W2. Furthermore, by optimizing the predetermined gap G between the first wall W1 and the saw chain 32, the guide wall W can be formed to more effectively discharge chips outside the main body 2. Furthermore, by arranging the opening 56 below the main body 2 so as to communicate with the internal space of the main body 2 in which the drive sprocket 33 is disposed, chips can be discharged outside the main body 2 through the opening 56. As a result, the chainsaw 1 can be used efficiently. In addition, by providing the guide wall W on the sprocket cover 55, chips carried inside the main body 2 can be easily removed even when the sprocket cover 55 is attached or detached. In other words, maintenance of the chainsaw 1 can be performed more efficiently.

[0036] Furthermore, as shown in Fig. 6, the second wall portion W2 preferably extends from the connection portion CP in a third direction D3. Specifically, when viewed from the left-right direction (for example, when viewed from the right side as shown in Fig. 6), the direction in which the second wall portion W2 extends from the connection portion CP is determined by the angle θ2 formed between the first direction D1 and the third direction D3. As shown in Fig. 6, the angle θ2 is preferably 51°. In more detail, the angle θ2 formed between the first direction D1 and the third direction D3 is preferably 40° to 60°, more preferably 45° to 55°, and even more preferably 47° to 52°. Specifically, the angle θ2 may be, for example, 40°, 40.5°, 41°, 41.5°, 42°, 42.5°, 43°, 43.5°, 44°, 44.5°, 45°, 45.5°, 46°, 46.5°, 47°, 47.5°, 48°, 48.5°, 49°, 49.5°, 50°, 50.5°, 51°, 51.5°, 52°, 52.5°, 53°, 53.5°, 54°, 54.5°, 55°, 55.5°, 56°, 56.5°, 57°, 57.5°, 58°, 58.5°, 59°, 59.5°, or 60°, or may be within a range between any two of the values ​​exemplified herein. According to this embodiment, by extending the second wall portion W2 from the connecting portion CP in the third direction D3 at an optimal angle, the guide wall W can be formed to more effectively discharge chips to the outside of the main body 2. This allows the chainsaw 1 to be used more efficiently.

[0037] Furthermore, as shown in FIG. 7 , the first wall portion W1 has a predetermined width WDH in the left-right direction. Specifically, the predetermined width WDH is widest at the connection point CP and gradually narrows upward from the connection point CP. That is, the predetermined width WDH gradually narrows upward from the connection point CP along the rotational direction of the drive sprocket 33. In other words, the predetermined width WDH is configured to narrow with increasing distance from the connection point CP. According to this embodiment, as the saw chain 32 moves, chips that have passed the connection point CP and been drawn into the main body 2 are further drawn to the saw chain 32 located at the center of the first wall portion W1 in the width direction, pulled upward, then pulled forward, and finally discharged outside the main body 2. In this way, by optimizing the predetermined width WDH so that the first wall portion W1 has an optimal shape, a guide wall W can be formed that can discharge chips that have passed the connection point CP and been carried into the main body 2 to the outside of the main body 2. As a result, the chainsaw 1 can be used more efficiently.

[0038] Furthermore, the predetermined width WDH at the position of the joint part CP is wider than the width in the left-right direction of the saw chain 32. Specifically, the ratio of the width in the left-right direction of the saw chain 32 to the predetermined width WDH at the position of the joint part CP (i.e., the value obtained by dividing the value of the predetermined width WDH at the position of the joint part CP by the value of the width in the left-right direction of the saw chain 32) is 3. In particular, the ratio may be 1.2 or more and 5 or less, preferably 2 or more and 4 or less, and more preferably 2.5 or more and 3.5 or less. Specifically, for example, the ratio is 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, and may be within a range between any two of the numerical values ​​exemplified here. According to this embodiment, the predetermined width WDH (the width of the guide wall W in the left-right direction) at the position of the joint part CP is configured to be wider than the width of the saw chain 32 in the left-right direction, so that a gap is formed on at least one of the left and right sides of the saw chain 32 in the left-right direction at the position of the joint part CP. As a result, chips that have come off the saw chain 32 at or near the position of the joint part CP pass through the gap and are discharged to the outside of the main body part 2. As a result, the chain saw 1 can be used even more efficiently.

[0039] (Motor 6) The motor 6 is a known electric motor configured to generate rotational power for driving the working unit 3. As shown in Fig. 2, the motor 6 includes a rotating shaft 61. As shown in Fig. 5, the rotating shaft 61 extends in the left-right direction and is connected to the drive sprocket 33 on the right side.

[0040] (Control Unit 7) 2, the control unit 7 has a box shape and is fixed to the housing 5. The control unit 7 is electrically connected to the motor 6 and the battery 8 by wires, connectors, etc., and controls the supply of electricity from the battery 8 to the motor 6. The control unit 7 is configured to electrically control the rotation of the motor 6.

[0041] (8 batteries) As shown in FIG. 1, battery 8 is a known battery, configured by housing a secondary battery such as a lithium-ion secondary battery in a rectangular parallelepiped case extending in the vertical direction. The height of battery 8 is greater than the height of the rear end of housing 5. Battery 8 is larger in size than batteries that are housed in housing 5. Battery 8 has a sufficiently high output and charging capacity suitable for work.

[0042] When attaching the battery 8 to the battery attachment / detachment section 54, the battery 8 is fitted into the battery attachment / detachment section 54 by sliding the battery 8 from above toward below relative to the battery attachment / detachment section 54. Then, when the battery 8 is moved to a position where it is supported by the battery attachment / detachment section 54, the engagement section of the battery 8 engages with the battery attachment / detachment section 54, and the battery 8 is fixed to the battery attachment / detachment section 54.

[0043] The battery 8 attached to the battery attachment / detachment part 54 is disposed at an angle so that its lower part is positioned further forward than its upper part. The battery 8 has a connection terminal (not shown), and when the battery 8 is fixed to the battery attachment / detachment part 54, the connection terminal of the battery 8 and the connection terminal (not shown) of the battery attachment / detachment part 54 are electrically connected. When the connection terminal of the battery 8 is connected to the connection terminal of the battery attachment / detachment part 54, power is supplied from the battery 8 to the motor 6 and the control unit 7.

[0044] When removing the battery 8 from the battery attachment / detachment section 54, the connection lever (not shown) of the battery 8 is pulled up, which disengages the battery attachment / detachment section 54 from the engagement section, allowing the battery 8 to be slid upward relative to the battery attachment / detachment section 54.

[0045] 2. Usage condition of chainsaw 1 Next, the state of use of the chainsaw 1 will be described with reference to other figures. Figure 9 is a diagram illustrating an example of the state of use, showing the main body in the state shown in the A-A cross section shown in Figure 3, viewed from the right side. Specifically, Figure 9 mainly shows the relationship between the saw chain 32, guide wall W, opening 56, and chips CW when the chainsaw 1 is in use. This relationship will be described in detail below.

[0046] [1] The chainsaw 1 can cut or otherwise perform work on an object by bringing the blades on the outer periphery of the saw chain 32 into contact with the object. At that time, chips CW, which are part of the object that has been cut or otherwise performed, may become caught on the blade of the saw chain 32. As the saw chain 32 moves in this state, the chips CW may be carried inside the main body 2.

[0047] [2] The chips CW transported inside the main body 2 may be removed from the saw chain 32 by an external force, or may move again to the outside of the main body 2 while still caught on the saw chain 32. The external force in this case may be, for example, an external force such as an inertial force or centrifugal force generated by the saw chain 32 moving along the drive sprocket 33, or an external force generated by contact with a part of the main body 2.

[0048] [3] Specifically, the chips CW carried inside the main body 2 are likely to be removed from the saw chain 32 by external forces such as inertial force and centrifugal force at a position where the saw chain 32 changes from linear movement to curved movement along the drive sprocket 33 or at a position where the degree of this change becomes large. As shown in Fig. 9, in detail, the chips CW carried inside the main body 2 are likely to be removed from the saw chain 32 at position 32a and in the vicinity of position 32a. In this case, position 32a is a position below the drive sprocket 33 and where the outer periphery of the saw chain 32 intersects with the first direction D1.

[0049] [4] In addition, in the main body 2, a connection part CP is disposed behind the position 32a. As a result, chips CW removed from the saw chain 32 by external forces such as inertial force and centrifugal force collide with the connection part CP. Alternatively, when a part of the chips CW is caught in the saw chain 32 and comes into contact with the connection part CP, an external force is generated on the chips CW, and the chips CW are removed from the saw chain 32. The chips CW removed from the saw chain 32 in this way move along the second wall part W2 and are discharged to the outside of the main body 2 through the opening 56.

[0050] [5] As shown in Figure 9, some of the chips CW may move again to the outside of the main body 2 while still caught on the saw chain 32. In this case, the chips CW move to the outside of the main body 2 by moving along the first wall W1.

[0051] According to this embodiment, chips CW carried into the main body 2 by the saw chain 32 can be removed from the saw chain 32 by the joint portion CP and the second wall portion W2, which are the guide wall W, and the chips CW can be discharged along the second wall portion W2 to the outside of the main body 2. Furthermore, chips CW carried into the main body 2 beyond the joint portion CP can be discharged along the first wall portion W1 to the outside of the main body 2. As a result, the chainsaw 1 can be used efficiently.

[0052] Furthermore, it may be provided in the following aspects.

[0053] (1) A chainsaw comprising a main body, the main body having a guide bar, a saw chain, a drive sprocket, and a guide wall, the saw chain being looped around the guide bar and the drive sprocket, the drive sprocket being disposed behind the guide bar and having a rotation axis in the left-right direction of the main body, and configured to rotate to move the saw chain along the guide bar, the guide wall comprising a first wall and a second wall, the first wall being provided in an arc shape along the drive sprocket and disposed with a predetermined gap between it and the saw chain, the second wall being a wall extending rearward via a connection to the first wall, and when viewed from the left-right direction, an angle formed by a first direction passing through the center of the rotation axis and along the up-down direction of the main body and a second direction passing through the center of the rotation axis and the apex of the connection is between 0° and 30°.

[0054] According to this aspect, chips carried into the main body by the saw chain can be removed from the saw chain by the guide wall, and the chips can be discharged to the outside of the main body along the second wall, resulting in efficient use of the chainsaw.

[0055] (2) In the chainsaw described in (1) above, the second wall portion extends from the connection portion in a third direction, and when viewed from the left-right direction, the angle between the first direction and the third direction is greater than or equal to 40° and less than or equal to 60°.

[0056] According to this aspect, by extending the second wall portion in the third direction from the connecting portion at an optimal angle, a guide wall that can more effectively discharge chips to the outside of the main body can be formed, resulting in more efficient use of the chainsaw.

[0057] (3) In the chainsaw described in (1) or (2) above, the first wall portion has a predetermined width in the left-right direction, and the predetermined width is configured to become narrower as it moves away from the connection portion.

[0058] According to this aspect, by optimizing the predetermined width so that the first wall portion has an optimal shape, it is possible to form a guide wall that can discharge chips that have passed over the connecting portion and been carried into the main body portion to the outside of the main body portion, thereby enabling more efficient use of the chainsaw.

[0059] (4) The chainsaw according to any one of (1) to (3) above, wherein the predetermined gap is 3 mm or more and 20 mm or less.

[0060] According to this aspect, by optimizing the predetermined gap between the first wall portion and the saw chain, a guide wall that can more effectively discharge chips to the outside of the main body can be formed, resulting in more efficient use of the chainsaw.

[0061] (5) A chainsaw according to any one of (1) to (4) above, wherein the main body further has an opening, which communicates with the space in which the drive sprocket is arranged and is open to the bottom of the main body.

[0062] According to this aspect, chips carried into the main body by the saw chain can be discharged to the outside of the main body through the opening, thereby enabling efficient use of the chain saw.

[0063] (6) A chainsaw according to any one of (1) to (5) above, wherein the main body further includes a sprocket cover, the sprocket cover being arranged to cover the drive sprocket, a portion of the saw chain, and a portion of the guide bar, and the guide wall being on the surface facing the drive sprocket.

[0064] According to this aspect, the sprocket cover has a guide wall, which makes it possible to perform maintenance on the chainsaw more efficiently. Of course, this is not the case.

[0065] As described above, various embodiments of the present invention have been described, but these are presented as examples and are not intended to limit the scope of the invention. The novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as set forth in the claims. [Example]

[0066] EXAMPLES The present invention will be explained in more detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

[0067] 1. Preparing the chainsaw (Example) A sprocket cover 55 was manufactured, having a guide wall W on the surface facing the drive sprocket 33. In this sprocket cover 55, the angle θ1 between the first direction D1 and the second direction D2 was set to 19°, and the angle θ2 between the first direction D1 and the third direction D3 was set to 51°. Next, a chainsaw was assembled using the manufactured sprocket cover 55. The gap G between the first wall portion W1 and the saw chain 32 was set to 6 mm.

[0068] (Comparative Example 1) The chainsaw was assembled in the same manner as in the example, except that the angle θ1 was set to 34°, the angle θ2 was set to 26°, and the gap G was set to 6 mm.

[0069] (Comparative Example 2) The chainsaw was assembled in the same manner as in the example, except that the angle θ1 was set to 83°, the angle θ2 was set to 83°, and the gap G was set to 20 mm.

[0070] 2. Evaluation Cutting and the like of substantially the same work object was carried out using the chainsaws prepared in Example, Comparative Example 1, and Comparative Example 2. Specifically, cutting and the like was carried out along the grain of the wood so as to generate long fiber-like chips CW. The results were evaluated according to the following criteria.

[0071] [Evaluation criteria] A: The cutting chips (CW) did not get stuck inside the chainsaw, and cutting of the workpiece could be done continuously without interruption. B: Although chips (CW) slightly clogged the inside of the chainsaw, cutting of the workpiece could be performed continuously without interruption. C: Due to slight clogging of cutting chips (CW) inside the chainsaw, cutting of the work object had to be interrupted infrequently (about once every 10 minutes). D: Due to a large amount of chips (CW) clogging the inside of the chainsaw, cutting of the work object had to be interrupted at moderate frequency (about once every 5 minutes). E: A large amount of cutting chips (CW) was clogging the inside of the chainsaw, forcing the cutting of the workpiece to be interrupted frequently (approximately once every two minutes).

[0072] The results of the example are shown in Figure 10. Figure 10 is a photograph showing the discharge of chips CW carried inside the main body in the example. Figure 10 shows the main body 2 viewed from the right side with the sprocket cover 55 removed. As shown in Figure 10, the chainsaw of the example was evaluated as A.

[0073] The results of Comparative Example 1 are shown in Figure 11. Figure 11 is a photograph showing the discharge of chips CW carried inside the main body in Comparative Example 1. Like Figure 10, Figure 11 also shows the main body 2 with the sprocket cover 55 removed, viewed from the right side. As shown in Figure 11, the chainsaw of Comparative Example 1 was rated C.

[0074] Furthermore, the chainsaw of Comparative Example 2 was rated E.

[0075] That is, in the Example, the chips CW carried inside the chainsaw were discharged to the outside of the chainsaw without clogging, compared to Comparative Examples 1 and 2. As a result, the chainsaw could be used efficiently. [Explanation of symbols]

[0076] 1: Chainsaw 2: Main body 3: Working section 31: Guide bar 32: Saw chain 32a :Position 33: Drive sprocket 33a: Rotating axis 33b: Shaft hole 33c:Protrusion 4: Handle 41: Top handle 411: Grip part 412: Trigger lever 413: Lockout lever 42: Horizontal handle 5: Housing 51: Left cover 52: Right cover 53: Front end 54: Battery attachment / detachment section 55: Sprocket cover 56: Opening 6: Motor 61: Rotation axis 7: Control unit 8: Battery CP: Connection CW: Chips D1: First direction D2: Second direction D3: Third direction G: Gap R:Outer diameter W: Guide wall W1: First wall W2: Second wall WDH: specified width θ1 :Angle θ2 :Angle

Claims

1. A chainsaw, A main body portion is provided, The main body portion has a guide bar, a saw chain, a drive sprocket, and a guide wall, The saw chain is wound around the guide bar and the drive sprocket, The drive sprocket The rotary shaft is disposed behind the guide bar and has a rotation axis in the left-right direction of the main body. The saw chain is configured to move along the guide bar by rotating, The guide wall comprises a first wall portion and a second wall portion, wherein: The first wall portion is a wall portion that is provided in an arc shape along the drive sprocket and is disposed with a predetermined gap between it and the saw chain, the second wall portion is a wall portion extending rearward via a connection portion to the first wall portion, When viewed from the left-right direction, the angle between a first direction passing through the center of the rotating shaft and along the up-and-down direction of the main body and a second direction passing through the center of the rotating shaft and the apex of the connection portion is greater than or equal to 0° and less than 30°.

2. The chainsaw according to claim 1, the second wall portion extends from the connection portion in a third direction; When viewed from the left-right direction, the angle formed between the first direction and the third direction is equal to or greater than 40° and equal to or less than 60°.

3. The chainsaw according to claim 1, The first wall portion has a predetermined width in the left-right direction, The chainsaw is configured so that the predetermined width becomes narrower with increasing distance from the connection portion.

4. The chainsaw according to claim 1, The chainsaw, wherein the predetermined gap is 3 mm or more and 20 mm or less.

5. The chainsaw according to claim 1, The body portion further has an opening, The opening communicates with a space in which the drive sprocket is disposed and opens downwardly to the main body.

6. The chainsaw according to claim 1, The main body further includes a sprocket cover, The sprocket cover is The drive sprocket, a portion of the saw chain, and a portion of the guide bar are arranged to cover the drive sprocket, a portion of the saw chain, and a portion of the guide bar. The chainsaw has the guide wall on the surface facing the drive sprocket.

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