Work machine

Abstract

The purpose of the present invention is to contribute to improvement of convenience. In a chain saw 1, a motor 30 is housed in a motor housing section 14 of a body housing 12. A portion of an upper end part of the motor housing section 14 is a body-side handle section 21, and a front part of a left hand of an operator, which is added from the upper side, is received by the body-side handle section 21. A plate-like extension handle section 22 is extended from an outer peripheral part of the upper end part of the motor housing section 14 to the rear side, and is arranged adjacent to the rear side of the body-side handle section 21. A rear part of the left hand of the operator is received by the extension handle section 22. That is, a part of the motor housing section 14 can be utilized as a grip part to be gripped by the operator. Thus, the extension length of the extension handle section 22 can be shortened as compared with a case where an upper handle 20 is composed only of the extension handle section 22. As a result, since the size of the entire chain saw 1 is reduced, a contribution can be made to the improvement of convenience of the chain saw 1.

Description

Work equipment

[0001] The present invention relates to a work machine.

[0002] In the chainsaw (working machine) described in Patent Document 1 below, a top handle is attached to the front of the main body housing and protrudes upward from the main body housing. A rear handle is provided on the rear side of the main body housing, and a trigger is attached to the rear handle. When cutting with the chainsaw, the operator can achieve stable cutting by holding the top handle with one hand and the rear handle with the other hand.

[0003] JP 2022-11393 A

[0004] However, the above chainsaw leaves room for improvement in the following respects. Specifically, the top handle of the above chainsaw protrudes upward from the main housing so that the operator's entire hand grips the top handle, which tends to increase the size of the chainsaw. On the other hand, with portable work machines such as chainsaws, increasing the size of the work machine can reduce the convenience of the work machine. Therefore, it is desirable to design work machines such as chainsaws with a structure that prevents the size from increasing and contributes to improving the convenience of the work machine.

[0005] In consideration of the above, an object of the present invention is to provide a work machine that can contribute to improving convenience.

[0006] One or more embodiments of the present invention are a work machine comprising: a motor; a tool bit that is driven by the driving force of the motor; a main body housing that accommodates the motor and has a main body grip portion on its outer periphery; and a plate-shaped extended grip portion that extends from the outer periphery of the main body housing to one side in a first direction when viewed from a predetermined direction and is positioned adjacent to one side of the main body grip portion in the first direction, wherein the boundary between the main body grip portion and the extended grip portion is bent so as to be convex toward one side in a second direction that intersects with the first direction when viewed from the predetermined direction.

[0007] One or more embodiments of the present invention are a work machine in which a first handle is formed by the main body grip portion and the extended grip portion, a second handle is connected to the main body housing and is held by the other hand of the operator, the second handle is formed in a columnar shape extending from the main body housing on the other side of the first handle in the second direction, and the second handle is provided with an operating portion that is operated by the operator.

[0008] One or more embodiments of the present invention are a work machine in which the tool bit protrudes from the main body housing to the other side in the first direction, and the second handle extends from the main body housing to one side in the first direction.

[0009] One or more embodiments of the present invention are a work machine in which the main body side grip covers the motor from one axial side, the main body housing has a cover wall that covers the motor from the radially outer side, and the extended grip extends from the cover wall to one side in the first direction and is positioned spaced apart from the cover wall to one side in the second direction.

[0010] One or more embodiments of the present invention are a work machine in which, when viewed from the specified direction, the extension length of the main body side grip portion is 60 mm or less, and the sum of the extension length of the main body side grip portion and the extension length of the extension grip portion is 90 mm or more.

[0011] One or more embodiments of the present invention are directed to a work machine in which the cover wall is formed with a vent hole that communicates between the inside and outside of the main body housing.

[0012] One or more embodiments of the present invention are directed to a work machine in which the angle formed between the main body grip portion and the extension grip portion when viewed from the predetermined direction is an obtuse angle.

[0013] One or more embodiments of the present invention are a work machine in which a return portion is formed at the tip of the extended grip portion, extending to the other side of the second direction, and when viewed from the specified direction, a hole portion is formed that is surrounded by the main housing, the extended grip portion, and the return portion.

[0014] One or more embodiments of the present invention are a work machine in which the tip of the return portion is connected to the main body housing, and the connection portion between the return portion and the main body housing has a hanging portion that is open to one side of the first direction when viewed from a specified direction.

[0015] One or more embodiments of the present invention are a work machine in which the other end of the tool bit in the first direction is a processing part that processes a workpiece, and when viewed from the specified direction, an overhead line that passes through the processing part and extends along the second direction passes through the center of the second handle.

[0016] One or more embodiments of the present invention are a work machine in which, when viewed from the specified direction, part of one of the worker's hands, which is placed from one side of the second direction, is received by the main body grip portion, and the other part of the hand is received by the extended grip portion.

[0017] One or more embodiments of the present invention are a work machine comprising: a main body housing having a motor, a motor housing portion that accommodates the motor, and a gear housing portion that accommodates a power transmission portion that transmits power from the motor; a tool bit that extends forward from the front of the main body housing and is driven by the driving force of the motor; a first handle including an extended grip portion that extends rearward from the top of the motor housing portion; and a second handle that extends rearward from the rear of the gear housing portion and has an operating portion that controls the drive of the motor.

[0018] In one or more embodiments of the present invention, the extension grip portion is plate-shaped, and the other end is connected to the rear of the motor housing portion to form a hole that penetrates in the left-right direction between the extension grip portion and the main housing.

[0019] One or more embodiments of the present invention can contribute to improved convenience.

[0020] 1 is a side view of the chainsaw according to the present embodiment, as seen from the left side. FIG. 2 is a plan view of the chainsaw shown in FIG. 1, as seen from above. FIG. 3 is a perspective view of the chainsaw shown in FIG. 1, as seen from the left rear. FIG. 4 is a side view of the interior of the chainsaw shown in FIG. 1, as seen from the right. FIG. 5 is a cross-sectional view (cross-sectional view taken along line 5-5 in FIG. 1) of the interior of the chainsaw shown in FIG. 1, as seen from below. FIG. 6 is a side view of the front end of the chainsaw body shown in FIG. 1, with the side cover removed. FIG. 7 is an enlarged side view of the area around the upper handle shown in FIG. 1. FIG. 8 is a side view of the side cover shown in FIG. 1, as seen from the right, with the plate cover of the tension adjustment mechanism removed. FIG. 9 is a cross-sectional view (cross-sectional view taken along line 9-9 in FIG. 1) of the vertical intermediate portion of the side cover shown in FIG. 1, as seen from below. FIG. 10 is a perspective view of the handle hole shown in FIG. 1, as seen from the left front, with an accessory attached. FIG. 11 is a side cross-sectional view of an example in which the upper handle shown in FIG. 1 is applied to a palm sander. FIG. 12 is a side cross-sectional view of an example in which the upper handle shown in FIG. 1 is applied to a saber saw. 1A is a side view showing an example in which the upper handle shown in Fig. 1 is applied to a lawn mower, and Fig. 1B is a side view showing an example in which the extension handle portion of the upper handle shown in Fig. 1 is configured separately from the main body housing, and Fig. 1C is a side view showing a state in which the extension handle of Fig. 1A has been rotated relative to the main body housing.

[0021] A chainsaw 1 as a work machine according to this embodiment will be described below with reference to the drawings. Note that the arrows UP, FR, and LH shown in the drawings indicate the upper side, front side, and left side of the chainsaw 1, respectively. In the following description, when the up-down, front-rear, and left-right directions are used, they refer to the up-down direction, front-rear direction, and left-right direction of the chainsaw 1 unless otherwise specified. The front-rear direction corresponds to the first direction in the present invention, and the up-down direction corresponds to the second direction in the present invention.

[0022] As shown in Figures 1 to 3, the chainsaw 1 is an electric power tool used to cut a workpiece. The chainsaw 1 has a chainsaw body 10 as a main body, a battery 48, a guide bar 50 as a guide, and a side cover 60 as a cover. The battery 48 is detachably attached to the chainsaw body 10. The chainsaw 1 also has a tension adjustment mechanism 80 (see Figures 7 and 8), which adjusts the tension of the saw chain 52 attached to the chainsaw body 10 (in other words, provides an appropriate tension to the saw chain, or provides tension to the saw chain 52 that will prevent the saw chain 52 from falling off the guide bar 50 and will not break the saw chain 52). The configuration of the chainsaw 1 will be described below.

[0023] (Regarding the chainsaw body 10) The chainsaw body 10 has a housing 11, which forms the outer shell of the chainsaw body 10. The housing 11 is formed in a generally long, hollow shape extending in the front-to-rear direction. The housing 11 has a main housing 12 which forms the front portion of the housing 11, a lower handle 15 which serves as a second handle and forms the middle portion of the housing 11 in the front-to-rear direction, and a battery attachment portion 17 which forms the rear end of the housing 11.

[0024] The main body housing 12 is formed in a generally hollow, flat shape with its thickness extending in the left-right direction. The lower portion (or front portion) of the main body housing 12 is a gear housing portion 13, and the upper portion (or rear portion) of the main body housing 12 is a motor housing portion 14. The motor housing portion 14 protrudes obliquely upward and rearward from the gear housing portion 13. More specifically, as shown in FIGS. 4 and 7 , the motor housing portion 14 is formed in a concave shape that opens obliquely downward and forward in a side cross-sectional view taken from the left-right direction (a predetermined direction), and the upper end of the motor housing portion 14 protrudes above the gear housing portion 13. The motor housing portion 14 has an upper corner 14A (see FIG. 7 ) that protrudes upward in side view, and the upper corner 14A constitutes the upper end of the motor housing portion 14 and the main body housing 12. The motor housing 14 also has a front upper wall 14B located in front of the upper corner 14A and a rear upper wall 14C serving as a cover wall located behind the upper corner 14A. In a side view, the front upper wall 14B extends in a direction that slopes downward toward the front, and the rear upper wall 14C extends in a direction that slopes downward toward the rear. The front end of the front upper wall 14B is bent upward and connected to the upper wall of the gear housing 13.

[0025] An upper handle 20 serving as a first handle and including a front upper wall 14B is provided on the main housing 12. When performing cutting using the chainsaw 1, the operator places one hand (in this embodiment, the left hand) on the upper handle 20 from above and grips the upper handle 20. The configuration of the upper handle 20 will be described later.

[0026] As shown in Figures 4 and 5, the motor housing portion 14 accommodates a motor 30, which is a brushless motor. The motor 30 has an output shaft 30A, which extends in a direction that slopes forward as it extends downward when viewed from the left and right. An upper end of the output shaft 30A is rotatably supported by a motor bearing 31, and a lower end portion of the output shaft 30A is rotatably supported by a motor bearing 32. The motor bearings 31 and 32 are fixed to the motor housing portion 14. As a result, the rear upper wall 14C covers the motor 30 from one axial side (diagonally upward rear side), and the front upper wall 14B covers the motor 30 from the radially outer side.

[0027] A fan 33 is provided at the lower end of the output shaft 30A so as to rotate integrally therewith. The rotation of the fan 33 together with the output shaft 30A generates an airflow within the motor housing portion 14. Specifically, the rotation of the fan 33 causes an airflow to flow into the motor housing portion 14 through side air intakes 14D (see FIGS. 1 to 3) formed in the side wall of the motor housing portion 14, thereby cooling the motor 30. A bevel gear 34 serving as a power transmission portion is provided at the lower end of the output shaft 30A so as to rotate integrally therewith.

[0028] A rotating shaft 35 is provided in the gear housing 13 on the other axial side of the motor 30, and the rotating shaft 35 is disposed with its axis aligned in the left-right direction. A left portion of the rotating shaft 35 is rotatably supported by a bearing 36, and a right portion of the rotating shaft 35 is rotatably supported by a bearing 37. The bearing 36 is fixed to the gear housing 13, and the bearing 37 is fixed to a holder member 38 provided within the gear housing 13. A bevel gear 39 is provided at an axially intermediate portion of the rotating shaft 35 so as to rotate integrally therewith, and the bevel gear 39 meshes with the bevel gear 34 of the motor 30. As shown in FIG. 6 , the left end of the rotating shaft 35 protrudes leftward from the gear housing 13, and a sprocket 40 serving as a rotating part is provided at the left end of the rotating shaft 35 so as to rotate integrally therewith. As a result, the sprocket 40 rotates together with the rotating shaft 35 when the motor 30 is driven.

[0029] The gear housing 13 is provided with a mounting bolt 41, the axial direction of which is the left-right direction, on the front side of the sprocket 40. The right end of the mounting bolt 41 is fixed to the gear housing 13, and the left part of the mounting bolt 41 protrudes to the left from the gear housing 13. A male thread is formed on the outer periphery of the left end of the mounting bolt 41. The gear housing 13 is also provided with a pair of front and rear guide shafts 42 on both front-rear sides of the mounting bolt 41, and the guide shafts 42 are arranged with their axial direction aligned with the left-right direction. The guide shafts 42 are embedded in the gear housing 13, and the left end of the guide shaft 42 protrudes to the left from the gear housing 13.

[0030] As shown in FIGS. 1 to 4 , the lower handle 15 is formed in a hollow column shape and extends rearward from the rear of the vertically middle portion of the gear housing portion 13. Specifically, the lower handle 15 is positioned below the rear upper wall 14C and is slightly tilted downward toward the rear in side view. That is, in side view, the handle center line 15A (see FIG. 1 ) of the lower handle 15 extends in a direction that tilts downward toward the rear. The upper outer periphery of the lower handle 15 is covered with a rubber portion 16 (see the gray area in FIGS. 1 and 2 ). The rubber portion 16 is made of an elastic material such as rubber or elastomer. The rubber portion 16 extends toward the main housing 12 and covers a portion of the main housing 12, and the surface of the upper handle 20 (described later) is formed by the rubber portion 16.

[0031] A controller 43 is housed in the rear of the lower handle 15, and the motor 30 is electrically connected to the controller 43. A trigger 44 serving as an operating unit is provided at the front end of the lower handle 15. The trigger 44 protrudes downward from the lower handle 15 and can be pulled upward. A switch 45 is provided inside the lower handle 15, above the rear end of the trigger 44, and the switch 45 is electrically connected to the controller 43. During cutting, the operator holds the lower handle 15 with his other hand (right hand) and pulls the trigger 44 with the fingers of the holding hand. When the trigger 44 is pulled, the trigger 44 presses the switch 45, and the switch 45 outputs an ON signal to the controller 43.

[0032] An off-lock button 46 is provided on the gear housing portion 13 at the boundary with the lower handle 15, and the off-lock button 46 protrudes to both the left and right from the rear of the main body housing 12. The off-lock button 46 is provided above the trigger 44 so as to prevent the trigger 44 from being pulled. By pushing the off-lock button 46 to the right or left, the trigger 44 can be pulled.

[0033] The battery mounting portion 17 protrudes upward and downward and left and right from the lower handle 15. The battery mounting portion 17 and the lower handle 15 are smoothly connected by a connecting portion 18. A handle guard 19 is provided below the lower handle 15. The handle guard 19 extends substantially parallel to the lower handle 15 in a side view, with the front end of the handle guard 19 connected to the lower end of the main body housing 12 and the rear end of the handle guard 19 connected to the battery mounting portion 17. A terminal unit 47 is provided in the battery mounting portion 17 and is electrically connected to the controller 43. A battery 48 is detachably attached to the battery mounting portion 17 and connected to the terminal unit 47. This electrically connects the battery 48 to the controller 43, and power is supplied from the battery 48 to the motor 30 and the controller 43.

[0034] (Regarding the Guide Bar 50) As shown in Figures 1, 3, and 5 to 8, the guide bar 50 is formed as a generally elongated plate with its thickness extending in the left-right direction and its length extending in the front-to-rear direction. A mounting groove 50A (see Figure 6) is formed in the center of the rear end of the guide bar 50 in the up-down direction. The mounting groove 50A is formed as a groove extending in the front-to-rear direction and penetrates the guide bar 50 in the left-to-right direction, with the rear end of the mounting groove 50A open to the rear. The mounting bolt 41 and guide shaft 42 are inserted into the mounting groove 50A of the guide bar 50, and the rear end of the guide bar 50 is attached to the chainsaw body 10 at the front left side of the gear housing 13 and in front of the sprocket 40 so as to be relatively movable in the front-to-rear direction. In other words, the guide bar 50 is attached to the chainsaw body 10 so as to be able to move toward and away from the sprocket 40. The guide bar 50 is fixed to the chainsaw body 10 by a side cover 60 and a fastening member 70, which will be described later, in a state in which it extends forward from the front of the gear housing portion 13.

[0035] The portion of the rear end of the guide bar 50 below the mounting groove 50A is a pressed portion 50B (see FIG. 6 ). The pressed portion 50B is located rearward and below the mounting bolt 41. A tension adjustment mechanism 80 (described later) presses the pressed portion 50B forward, thereby urging the guide bar 50 forward and adjusting the tension of the saw chain 52 (described later).

[0036] An endless saw chain 52 serving as a tool tip is wound around the outer periphery of the sprocket 40 and the guide bar 50. Therefore, when the sprocket 40 is rotated by the drive of the motor 30, the saw chain 52 rotates in one circumferential direction along the outer periphery of the guide bar 50. This causes cutting to be performed on a workpiece located below the front portion of the saw chain 52. In other words, the lower end of the outer periphery of the saw chain 52 serves as a cutting section 52A (see FIG. 1 ) that cuts the workpiece. In other words, the saw chain 52 is fixed to the chainsaw body 10, extending forward together with the guide bar 50 from the front portion of the gear housing 13.

[0037] 1 , the vertical position of the lower handle 15 relative to the saw chain 52 is set so that, in a side view, an overhead wire OL that passes through the processing portion 52A of the saw chain 52 and extends in the front-to-rear direction passes through the center portion 15B of the lower handle 15. Note that the center portion 15B of the lower handle 15 in a side view is the intersection of the longitudinal center of the lower handle 15 and the handle center line 15A. Here, the front end 15F of the lower handle 15 is a portion adjacent to the rear side of the off-lock button 46, and the rear end 15R of the lower handle 15 is a portion adjacent to the front side of the connection portion 18.

[0038] (Regarding the side cover 60) As shown in Figures 1 to 3, 5, 8, and 9, the side cover 60 covers the rear of the sprocket 40 and the guide bar 50 from the left side, and is fixed to the chainsaw body 10 together with the guide bar 50 by a fastening member 70.

[0039] The side cover 60 is generally formed in a generally concave shape that opens to the right and front. A vertically intermediate portion of the front end of the side cover 60 defines a cover fixing portion 61, and a fastening member 70 (described later) is disposed in the cover fixing portion 61. A metal bushing 65 (see FIGS. 5 and 8 ) is embedded in the cover fixing portion 61, and the bushing 65 is integrally formed with the side cover 60 by insert molding or other techniques. The mounting bolt 41 is inserted through the bushing 65, and the side cover 60 is disposed on the left side of the gear housing portion 13. The fastening member 70 is threadedly engaged with the tip of the mounting bolt 41 to fasten the side cover 60, thereby fastening the side cover 60 together with the guide bar 50 to the chainsaw body 10. The fastening member 70 includes a generally disc-shaped base portion 71 whose thickness is in the left-right direction and a nut 72 embedded in the center of the base portion 71, and the nut 72 is threadedly engaged with the mounting bolt 41. A clamping lever 73 is provided on the base portion 71, and the clamping lever 73 is rotatably connected to the base portion 71 with the vertical direction as its axial direction.

[0040] As described above, the side cover 60 is removably attached to the main housing 12. When the side cover 60 is attached to the main housing 12, the sprocket 40 and the rear portion of the guide bar 50 are housed inside the side cover 60 (see FIG. 8). In other words, the side cover 60 defines a storage space for accommodating the sprocket 40.

[0041] As shown in FIGS. 1 and 9 , a lever housing 62 for housing a switching lever 87 (described later) is formed on the outer periphery (left side surface) of the rear portion of the side cover 60. The lever housing 62 is formed in a concave shape that opens to the left and extends in the front-to-rear direction. An inclined bottom surface 62A is formed on the front bottom surface of the lever housing 62, and in a cross-sectional view from below, the inclined bottom surface 62A slopes to the right as it approaches the rear. An engagement hook 62B is formed on the rear bottom surface of the lever housing 62 as an engagement portion that constitutes part of the tension adjustment mechanism 80 (described later). In a cross-sectional view from below, the engagement hook 62B has a wedge shape. Specifically, in a cross-sectional view from below, the engagement hook 62B has a hook inclined surface 62B1 that slopes to the left as it approaches the rear, and an engagement surface 62B2 that extends to the right from the rear end of the hook inclined surface 62B1.

[0042] 8 and 9 , a plate accommodating portion 63 for accommodating a pressure plate 82 (described later) is formed on the inner peripheral portion of the rear of the side cover 60. The plate accommodating portion 63 is formed in a generally rectangular recessed shape with its longitudinal direction extending in the front-to-rear direction and open to the right, and protrudes to the right from the inner peripheral surface of the side cover 60. The lever accommodating portion 62 described above is located on the left side of the lower portion of the plate accommodating portion 63, and the lever accommodating portion 62 and the plate accommodating portion 63 are separated by the bottom wall of the lever accommodating portion 62. A communication hole 62C is formed through the bottom wall of the lever accommodating portion 62 between the inclined bottom surface 62A and the engaging hook 62B, and the communication hole 62C connects the lever accommodating portion 62 and the lower portion of the plate accommodating portion 63.

[0043] A spring accommodating portion 63A is formed in the upper portion of the plate accommodating portion 63 to accommodate a biasing spring 83 (described later). The spring accommodating portion 63A is formed in a recessed shape extending in the front-rear direction and opening to the right, thereby dividing the spring accommodating portion 63A and the lower portion of the plate accommodating portion 63 into upper and lower sections. A stepped portion 63B is formed on the inner surface of the peripheral wall of the plate accommodating portion 63, protruding inward. The stepped portion 63B extends in the circumferential direction of the plate accommodating portion 63 and is positioned one step lower to the left of the open end of the plate accommodating portion 63. A pair of front and rear fixing holes 63C are formed in the upper portion of the stepped portion 63B, and the fixing holes 63C are formed in a recessed shape opening to the right. An extended accommodating portion 63D is formed in the front end of the peripheral wall of the plate accommodating portion 63 at a vertically intermediate portion, protruding forward. The extended accommodating portion 63D extends the plate accommodating portion 63 forward.

[0044] (Regarding the Upper Handle 20) As shown in FIGS. 1 to 4 and 7 , the upper handle 20 forms the upper end of the chainsaw 1 and the main housing 12 and extends in the front-to-rear direction. The upper handle 20 includes a main handle portion 21 serving as a main grip forming the front portion of the upper handle 20, and an extension handle portion 22 serving as an extension grip forming the rear portion of the upper handle 20. The main handle portion 21 is formed by the front upper wall 14B of the motor housing portion 14 and the upper ends of the left and right side walls of the motor housing portion 14, and has a predetermined thickness when viewed from the left and right. The rubber portion 16 described above covers the motor housing portion 14 so as to form the surface of the main handle portion 21. That is, in this embodiment, the front upper wall 14B, the main handle portion 21, and the extension handle portion 22 are all formed to include the rubber portion 16. The upper surface of the main body side handle portion 21 is a main body side receiving surface 21A, which is configured as a receiving surface that receives the front part of the operator's left hand that is placed on the upper handle 20.

[0045] The extension handle 22 is formed in a generally rectangular plate shape with its thickness in the vertical direction and extending in the front-to-rear direction. It is located rearward of the upper corner 14A of the motor housing 14 and spaced apart above the rear upper wall 14C. In other words, the extension handle 22 extends rearward from the upper end of the rear upper wall 14C and is positioned adjacent to the rear of the main body handle 21. More specifically, the extension handle 22 extends rearward from the outer periphery of the upper end of the motor housing 14 so as not to change the vertical dimension of the main body housing 12. As a result, in a side view, the upper handle 20 is bent upwardly convexly at the boundary between the main body handle 21 and the extension handle 22. The upper surface of the extension handle 22 is an extension receiving surface 22A, which is continuous with the main body receiving surface 21A. In addition, the angle AG formed by the main body side receiving surface 21A (main body side handle portion 21) and the extension receiving surface 22A (extension handle portion 22) is set to an obtuse angle in side view.

[0046] The extended support surface 22A is configured as a support surface that supports the rear of the operator's left hand, which is placed on the upper handle 20. As a result, during cutting, the operator places his or her left hand on the upper handle 20 and grips the upper handle 20. That is, the upper handle 20 utilizes a portion of the upper end portion of the main body housing 12 and extends in the front-to-rear direction so as to straddle the upper end (upper end corner 14A) of the motor housing portion 14. As a result, in the chainsaw 1, the operator directly grips a portion of the main body housing 12. In addition, the upper handle 20 is located above the front end of the lower handle 15 (where the trigger 44 is located).

[0047] When viewed from the left and right, the extension length of the main body receiving surface 21A (main body handle portion 21) is 60 mm or less (46 mm in this embodiment), and the sum of the extension length of the main body receiving surface 21A and the extension length of the extension receiving surface 22A (extension handle portion 22) is 90 mm or more (96 mm in this embodiment). The width dimension (left and right dimension) of the upper handle 20 is set slightly smaller than the thickness dimension of the main body housing 12 (see FIG. 2).

[0048] A barb 23 is integrally formed at the tip (rear end) of the extension handle 22 (upper handle 20). The barb 23 extends downward from the tip of the extension handle 22, and the lower end of the barb 23 is bent diagonally downward and forward to connect to the rear upper wall 14C of the motor housing 14. As a result, in a side view, the chainsaw 1 has a handle hole 24 as a hole surrounded by the rear upper wall 14C (main housing 12), the extension handle 22, and the barb 23. The handle hole 24 penetrates in the left-right direction below the extension handle 22. In addition, a finger hook 25 as a hook is formed on the outer periphery of the housing 11 (main housing 12) at the connection between the barb 23 and the rear upper wall 14C. The finger hook 25 is carved into a generally V-shape that is open to the rear in a side view. That is, a finger hook 25 is formed on the outer periphery of the housing 11 below the upper handle 20. The vertical distance between the finger hook 25 and the upper handle 20 is set so that the operator can hook the operator's thumb FG (see FIG. 7 ) onto the finger hook 25 when gripping the upper handle 20 with his / her left hand.

[0049] A rear air intake port 14E (see FIGS. 3 and 4) serving as an air vent is formed through the rear upper wall 14C of the motor housing portion 14. The rear air intake port 14E connects the handle hole 24 to the interior of the motor housing portion 14. The rear air intake port 14E is formed as an elongated hole with its longitudinal direction extending vertically. This allows air to flow into the motor housing portion 14 from the rear air intake port 14E when the fan 33 is rotating.

[0050] 8 and 9 , the tension adjustment mechanism 80 is configured as a mechanism that biases the guide bar 50 forward to adjust the tension of the saw chain 52. The tension adjustment mechanism 80 is configured to be switchable between a biased state in which the guide bar 50 is biased forward and a non-biased state in which the guide bar 50 is not biased. The tension adjustment mechanism 80 has a biasing mechanism 81 and a switching mechanism 86.

[0051] The biasing mechanism 81 has a pressure plate 82 as a moving member and a biasing spring 83 as a biasing member. The pressure plate 82 has a thickness in the left-right direction and is formed in a generally Y-shaped plate that is open to the rear when viewed from the left-right direction. Specifically, the pressure plate 82 has a front plate portion 82A extending in the front-to-rear direction, a first rear plate portion 82B extending upward and rearward from the rear end of the front plate portion 82A, and a second rear plate portion 82C extending downward and rearward from the rear end of the front plate portion 82A.

[0052] The pressing plate 82 is accommodated in the plate accommodating portion 63 of the side cover 60 so as to be movable in the front-to-rear direction. Specifically, the front plate portion 82A is accommodated in the extended accommodating portion 63D of the plate accommodating portion 63, the first rear plate portion 82B is accommodated in the upper portion of the plate accommodating portion 63, and the second rear plate portion 82C is accommodated in the lower portion of the plate accommodating portion 63.

[0053] A pressing portion 82D is formed at the front end of the front plate portion 82A, bending it to the right, and the tip of the pressing portion 82D is folded back 180 degrees. When the tension adjustment mechanism 80 is in the biased state, the tip of the pressing portion 82D abuts against the pressed portion 50B of the guide bar 50 from the rear, and the biasing force of a biasing spring 83 (described later) presses the pressed portion 50B forward (see the pressing plate 82 indicated by the solid line in FIG. 9 ). When the tension adjustment mechanism 80 is in the unbiased state, the pressing plate 82 is positioned away from the rear of the guide bar 50 by a switching lever 87 (described later), and the pressing portion 82D is released from abutment against the pressed portion 50B (see the pressing portion 82D and switching lever 87 indicated by the two-dot chain line in FIG. 9 ). The positions of the pressure plate 82 and the switching lever 87 when the tension adjustment mechanism 80 is in the non-biased state are referred to as the non-biased positions.

[0054] The rear end of the first rear plate portion 82B is bent to the left and disposed within the spring housing portion 63A of the side cover 60. A biasing spring 83 configured as a compression coil spring is housed within the spring housing portion 63A on the rear side of the first rear plate portion 82B. The front end of the biasing spring 83 is engaged with the rear end of the first rear plate portion 82B, and the rear end of the biasing spring 83 is engaged with the rear surface of the spring housing portion 63A, so that the biasing spring 83 biases the first rear plate portion 82B (pressure plate 82) forward. As a result, when the tension adjustment mechanism 80 is in the biased state and the clamping member 70 is released from clamping against the side cover 60, the biasing spring 83 biases the guide bar 50 forward, thereby adjusting the tension of the saw chain 52.

[0055] The rear end of the second rear plate portion 82C is bent to the left and inserted through the communication hole 62C of the side cover 60, and is disposed within the lever accommodating portion 62 of the side cover 60. A connecting piece 82E bent rearward is formed at the rear end of the second rear plate portion 82C. A connecting hole 82F is formed in the vertical direction through the connecting piece 82E.

[0056] A plate cover 84 is provided in the opening of the plate accommodating portion 63 in the side cover 60, and the plate cover 84 closes the opening, maintaining the pressure plate 82 and the biasing spring 83 housed in the plate accommodating portion 63. The plate cover 84 is formed in a generally rectangular plate shape with its thickness in the left-right direction, and the outer periphery of the plate cover 84 rests on the stepped portion 63B of the plate accommodating portion 63. The lower end of the plate cover 84 engages with the lower wall of the plate accommodating portion 63 by a claw engagement, and the upper end of the plate cover 84 is fastened and fixed to the stepped portion 63B by a fixing screw 85. Specifically, the plate cover 84 has a hole corresponding to the fixing hole 63C of the plate accommodating portion 63, and the fixing screw 85 inserted through the hole is threaded into the fixing hole 63C, fastening and fixing the plate cover 84 to the stepped portion 63B.

[0057] The switching mechanism 86 is composed of a switching lever 87 as a switching member and the aforementioned engagement hook 62B formed on the side cover 60. The switching lever 87 is formed in a generally rectangular recessed shape with its longitudinal direction extending in the left-right direction and open to the right, and is housed in the lever housing 62 of the side cover 60. A lever inclined portion 87A is formed at the front end of the bottom wall (left wall) of the switching lever 87, and the lever inclined portion 87A inclines to the right as it approaches the front in a plan view. A lever recess 87B is formed at the rear end portion of the switching lever 87. The lever recess 87B is open to the left and is formed in the shape of a groove extending in the vertical direction, and penetrates in the vertical direction. The right end of the rear wall of the switching lever 87 serves as a lever engagement portion 87C.

[0058] Three connecting ribs 87D to 87F are formed inside the switching lever 87 at a central portion in the front-to-rear direction. The connecting ribs 87D to 87F have the front-to-rear direction as the plate thickness direction, extend in the up-down direction, and are arranged side by side at a predetermined interval in the front-to-rear direction. Both up-down ends of the front connecting rib 87D are connected to the upper and lower side walls of the switching lever 87. The second connecting rib 87E from the front and the rear connecting rib 87F have their upper ends connected to the upper side wall of the switching lever 87 and their lower ends spaced apart from the lower side wall of the switching lever 87.

[0059] A connecting shaft 88, whose axial direction is the up-down direction, is provided between the connecting ribs 87E and 87F, and the connecting shaft 88 is bridged across the upper and lower side walls of the switching lever 87. The rear end of the second rear plate portion 82C of the pressing plate 82 is disposed between the connecting ribs 87D and 87E, and the connecting piece 82E of the pressing plate 82 is disposed between the connecting ribs 87E and 87F and the lower side wall of the switching lever 87. The connecting shaft 88 is inserted through the connecting hole 82F of the pressing plate 82. As a result, the switching lever 87 is connected to the pressing plate 82 so as to be movable integrally in the front-rear direction, and is also connected to the pressing plate 82 so as to be rotatable about the up-down direction as its axial direction.

[0060] When the tension adjustment mechanism 80 is in the biased state, the front end of the switching lever 87 is positioned adjacent to the left side of the inclined bottom surface 62A of the side cover 60, and the lever engagement portion 87C of the switching lever 87 is positioned adjacent to the left side of the hook inclined surface 62B1 of the engagement hook 62B of the side cover 60. To switch the tension adjustment mechanism 80 from the biased state to the unbiased state, an operator slides the switching lever 87 rearward to engage the lever engagement portion 87C with the engagement hook 62B, thereby switching the tension adjustment mechanism 80 to the unbiased state. Specifically, an operator inserts his or her finger into the lever recess 87B of the switching lever 87 to slide the switching lever 87 to the unbiased position. When the switching lever 87 is in the unbiased position, the lever recess 87B is pushed to the right and the switching lever 87 is rotated relative to the pressure plate 82, whereby the lever engagement portion 87C engages with the engagement surface 62B2 of the engagement hook 62B. As a result, the side cover 60 restricts the forward movement of the switching lever 87, and the tension adjustment mechanism 80 is maintained in a non-biased state.

[0061] On the other hand, when the switching lever 87 is in the non-biased position, pressing the lever inclined portion 87A of the switching lever 87 to the right rotates the switching lever 87 relative to the pressure plate 82, disengaging the lever engaging portion 87C from the engaging hook 62B. As a result, the biasing force of the biasing spring 83 causes the pressure plate 82 and the switching lever 87 to slide forward, and the pressing portion 82D of the pressure plate 82 presses the pressed portion 50B of the guide bar 50 forward. Thus, the tension adjustment mechanism 80 switches from the non-biased state to the biased state.

[0062] The positions of the tension adjustment mechanism 80 in the front-rear and up-down directions are set so that the sprocket 40 and the rear of the tension adjustment mechanism 80 overlap when viewed from the left-right direction (see FIG. 8 ). That is, the tension adjustment mechanism 80 is located behind the cover fixing portion 61 of the side cover 60 and the fastening member 70. Specifically, when viewed from the left-right direction, the tension adjustment mechanism 80 is located inside the outer periphery (blade portion) of the rear of the saw chain 52 wrapped around the sprocket 40. When viewed from the left-right direction, the majority of the tension adjustment mechanism 80 is located below the vertical center of the guide bar 50 and the mounting bolt 41, while the fixing screw 85 that secures the plate cover 84 is located above the vertical center of the guide bar 50. Furthermore, the left-right size of the tension adjustment mechanism 80 (switching lever 87) is set so that the tension adjustment mechanism 80 (switching lever 87) does not protrude to the left of the fastening member 70 (see FIG. 9 ).

[0063] (Operation and Effect) Next, the operation and effect of this embodiment will be described.

[0064] In the chainsaw 1 configured as described above, the operator holds the lower handle 15 with his right hand and the upper handle 20 with his left hand. Then, by pulling the trigger 44, the motor 30 is driven and the sprocket 40 rotates. This causes the saw chain 52 to rotate in the circumferential direction of the guide bar 50, and the rotating saw chain 52 cuts the workpiece.

[0065] In the chainsaw 1, the motor 30 is housed in the motor housing portion 14 of the main body housing 12. A portion of the upper end of the motor housing portion 14 forms a main body handle portion 21, which receives the front portion of the operator's left hand placed from above. A plate-shaped extension handle portion 22 extends rearward from the outer periphery of the upper end of the motor housing portion 14 and is positioned adjacent to the rear side of the main body handle portion 21. The extension handle portion 22 receives the rear portion of the operator's left hand. In other words, the upper handle 20 can be formed on the main body housing 12 using a portion of the motor housing portion 14 as a grip portion for the operator to grasp. This allows the extension length of the extension handle portion 22 to be shorter than when the upper handle 20 is formed only with the extension handle portion 22. In other words, the size of the motor housing portion 14 (main body housing 12) can be made smaller than when the upper handle 20 is formed only with the extension handle portion 22. In other words, the upper handle 20 can be provided on the main body housing 12 while preventing the size of the chainsaw 1 from increasing. This contributes to improving the convenience of the chainsaw 1.

[0066] Moreover, the extension handle 22 is formed in a plate shape and extends rearward from the motor housing 14. As a result, even if a part of the main body housing 12 is configured as the front part of the upper handle 20, the extension handle 22 ensures a good grip on the upper handle 20. This also improves the convenience of the chainsaw 1.

[0067] Furthermore, in the upper handle 20, the extension handle portion 22 extends rearward from the upper end of the motor housing portion 14 and is disposed adjacent to the rear side of the main body handle portion 21. Therefore, the size of the chainsaw 1 in the vertical direction can be made smaller than in a configuration in which the extension handle portion 22 extends upward.

[0068] The chainsaw 1 also has a lower handle 15 that is held by the operator's right hand, and the lower handle 15 extends rearward from the main body housing 12 below the upper handle 20. The lower handle 15 also has a trigger 44 that is operated by the operator. This allows the operator to cut the workpiece while holding the chainsaw 1 with both hands.

[0069] Furthermore, in the chainsaw 1, the saw chain 52 protrudes forward from the main body housing 12, and the extension handle portion 22 of the upper handle 20 and the lower handle 15 extend rearward from the main body housing 12. This allows an operator positioned behind the main body housing 12 to grip the chainsaw 1 and perform cutting on a workpiece positioned in front of the main body housing 12.

[0070] In addition, in the motor housing portion 14, the front upper wall 14B (main body handle portion 21) covers the motor 30 from one axial side (upper side), and the rear upper wall 14C covers the motor 30 from the radially outer side. The extension handle portion 22 extends rearward from the upper end of the rear upper wall 14C and is positioned above the rear upper wall 14C at a distance. This allows the front upper wall 14B, which covers the motor 30 from one axial side, to be used as part of the upper handle portion 20 while forming the upper handle portion 20. Furthermore, by providing the extension handle portion 22 separately from the rear upper wall 14C, the grip of the upper handle portion 20 can be improved, as described above. In other words, by changing the position of the rear upper wall 14C to the position of the extension handle portion 22 and expanding the upper portion of the motor housing portion 14, the upper handle portion 20 can be formed at the upper end of the motor housing portion 14. In this case, the entire upper end of the motor housing portion 14 becomes the upper handle 20, which may reduce the gripping ability of the upper handle 2. In contrast, by providing the plate-shaped extension handle portion 22 in the upper handle 20 separately from the rear upper wall 14C, the gripping ability of the upper handle 20 can be ensured by the extension handle portion 22, as described above. Therefore, the gripping ability of the upper handle 20 can be improved.

[0071] In addition, when viewed from the left and right, the extension length of the main body handle portion 21 is set to 60 mm or less, and the sum of the extension length of the main body handle portion 21 and the extension length of the extension handle portion 22 is set to 90 mm or more. This prevents the extension length of the main body handle portion 21 from becoming excessively long, while effectively ensuring the length of the upper handle 20 that can receive the operator's hand.

[0072] In addition, when viewed from the left and right, the angle AG between the main body handle portion 21 and the extension handle portion 22 is an obtuse angle. This allows the upper handle 20 to be shaped to be easy to grip. Also, the boundary between the main body handle portion 21 and the extension handle portion 22 can be easily recognized by the operator.

[0073] A barb 23 is formed at the rear end of the extension handle 22, and the barb 23 extends downward from the rear end of the extension handle 22. As a result, a handle hole 24 is formed in the housing 11, surrounded by the motor housing 14, the extension handle 22, and the barb 23 when viewed from the left and right. This allows, for example, an operator to insert the thumb FG (see FIG. 7 ) of his or her left hand into the handle hole 24 and grip the upper handle 20 with the palm of his or her hand. This effectively improves the grip of the upper handle 20. Furthermore, for example, as shown in FIG. 10 , an accessory 90 such as a carabiner can be inserted into the handle hole 24 and used to hang the chainsaw 1. This can contribute to preventing the chainsaw 1 from falling, for example.

[0074] The lower end of the return portion 23 is bent diagonally downward and forward and connected to the motor housing portion 14. Furthermore, a finger hook 25 that opens toward the rear when viewed from the left and right is formed at the connection between the return portion 23 and the motor housing portion 14. This allows, for example, the thumb FG of the operator's left hand (see FIG. 7) to be hooked onto the finger hook 25 and the upper handle 20 to be gripped with the palm of the hand. This effectively improves the gripping performance of the upper handle 20.

[0075] Furthermore, a rear air intake port 14E is formed in the rear upper wall 14C of the main body housing 12, and the rear air intake port 13E connects the handle hole 24 to the inside of the main body housing 12. Therefore, even if the side air intake port 14D of the main body housing 12 is blocked by the left hand gripping the upper handle 20, the rear air intake port 13E can maintain communication between the inside and outside of the main body housing 12. As a result, even if part of the main body housing 12 is configured as the upper handle 20, cooling performance for the motor 30 can be ensured.

[0076] Furthermore, the vertical position of the lower handle 15 is set so that, in a side view, the overhead wire OL, which passes through the working portion 52A of the saw chain 52 and extends in the front-to-rear direction, passes through the center portion 15B of the lower handle 15. This improves the operability of the chainsaw 1. Specifically, when cutting with the chainsaw 1, the working portion 52A of the saw chain 52 is brought into contact with the workpiece from above. Therefore, for example, when the center portion 15B of the lower handle 15 is positioned above the overhead wire OL, the timing at which the working portion 52A contacts the workpiece occurs earlier than the operator's intended timing. On the other hand, when the center portion 15B of the lower handle 15 is positioned below the overhead wire OL, the timing at which the working portion 52A contacts the workpiece occurs later than the operator's intended timing. This may cause discomfort to the operator during cutting, potentially reducing operability. In contrast, in this embodiment, the vertical position of the center portion 15B of the lower handle 15 is set to be the same as the vertical position of the working portion 52A. Therefore, the timing of contact of the working portion 52A with the workpiece can be made to coincide with the timing expected by the operator, thereby improving the operability of the chainsaw 1.

[0077] In this embodiment, the handle structure utilizing a part of the main body housing 12 is applied to the chainsaw 1, but the handle structure may be applied to other work machines. An example of applying the handle structure to other work machines will be described below.

[0078] Using Figure 11, we will explain an example in which the handle structure is applied to a palm sander 100 as a work machine. The palm sander 100 is an electric tool that performs polishing on a workpiece. Figure 11 is a side cross-sectional view showing the interior of the palm sander 100. The palm sander 100 has a main body housing 112 that forms the outer shell of the palm sander 100 and houses a motor 130. The main body housing 112 is formed in a concave shape that opens downward when viewed in side cross-section. That is, an upper corner 112A is formed at the rear end of the upper end of the main body housing 112, and an upper wall 112B of the main body housing 112 extends rearward from the upper corner 112A. A portion of the upper end of the main body housing 112, including the upper wall 112B, serves as a main body handle portion 121 serving as a main body grip portion, and the main body handle portion 121 constitutes the rear portion of an upper handle 120 serving as a first handle. An extension handle 122 serving as an extended grip extends forward from the upper corner 112A and is disposed adjacent to the front side of the main body handle 121. A grinding wheel 152 serving as a tip tool is provided on the underside of the main body housing 112, and the grinding wheel 152 is rotated by the driving force of the motor 130.

[0079] Furthermore, a return portion 123 extends downward from the front end of the extension handle portion 122, and the lower end of the return portion 123 is bent rearward and connected to the main body housing 112. As a result, the main body housing 112 is formed with a handle hole 124 as a hole portion and a finger hook 125 as a hook portion.

[0080] As described above, in the palm sander 100, a portion of the upper end of the main housing 112 serves as the main handle portion 121, and the rear of the operator's hand, which is placed from above, is supported by the main handle portion 121. In addition, a plate-shaped extension handle portion 122 extends forward from the outer periphery of the upper end of the main housing 112 and is positioned adjacent to the front side of the main handle portion 121. The front of the operator's hand is supported by the extension handle portion 122. Therefore, in the palm sander 100, the size of the palm sander 100 can be made smaller than when the upper handle 120 is composed only of the extension handle portion 122. As a result, this contributes to improving the convenience of the palm sander 100.

[0081] Next, an example in which the handle structure is applied to a saber saw 200 as a work machine will be described using FIG. 12 . The saber saw 200 is a power tool used to cut a workpiece. FIG. 12 is a side cross-sectional view showing the interior of the saber saw 200. The saber saw 200 has a housing 211 that forms the outer shell of the saber saw 200. The front end of the housing 211 is configured as a main body housing 212 that houses a motor 230. The rear portion of the main body housing 212 protrudes upward relative to the front portion and is formed into a concave shape that is open downward in a side cross-sectional view. That is, an upper corner 212A is formed at the front end of the upper end of the main body housing 212, and a front upper wall 212B of the main body housing 212 extends diagonally downward and forward from the upper corner 212A. A part of the upper end of the main body housing 212, including the front upper wall 212B, serves as a main body handle portion 221 serving as a main body grip portion, and the main body handle portion 221 constitutes the front portion of an upper handle 220 serving as a first handle. An extension handle portion 222 serving as an extension grip portion extends rearward (more specifically, diagonally upward and rearward) from the upper end corner 212A and is disposed adjacent to the rear side of the main body handle portion 221. A blade 252 serving as a tool tip is provided at the front end of the saber saw 200, and the blade 252 moves back and forth in the front-to-rear direction by the driving force of the motor 230.

[0082] Furthermore, a return portion 223 extends diagonally downward and rearward from the rear end of the extension handle portion 1222, and the rear end of the return portion 223 is bent downward and connected to the main body housing 212. As a result, the main body housing 212 is formed with a handle hole 224 as a hole portion and a finger hook 225 as a hook portion.

[0083] As described above, in the saber saw 200, a portion of the upper end of the main body housing 212 serves as the main body handle portion 221, and the front part of the operator's hand, which is placed from above, is supported by the main body handle portion 221. In addition, a plate-shaped extension handle portion 222 extends rearward from the outer periphery of the upper end of the main body housing 212 and is disposed adjacent to the rear side of the main body handle portion 221. The rear part of the operator's hand is supported by the extension handle portion 222. Therefore, in the saber saw 200, the size of the saber saw 200 can be made smaller than when the upper handle 220 is configured only with the extension handle portion 222. This contributes to improving the convenience of the saber saw 200.

[0084] Next, an example in which the handle structure is applied to a lawn mower 300 as a work machine will be described with reference to FIG. 13 . The lawn mower 300 is a power tool used to cut grass. FIG. 13 is a side cross-sectional view showing the interior of the lawn mower 300. The lawn mower 300 has a housing 311 that forms the outer shell of the lawn mower 300. The front end of the housing 311 is configured as a main body housing 312 that houses a motor 330. The main body housing 312 is formed in a concave shape that opens downward in a side cross-sectional view. That is, an upper corner 312A is formed at the front end of the upper end of the main body housing 312, and an upper wall 312B of the main body housing 312 extends rearward from the upper corner 312A. A portion of the upper end of the main body housing 312, including the upper wall 312B, forms a main body handle 321 that serves as a main body grip, and the main body handle 321 forms the rear portion of an upper handle 320 that serves as a first handle. An extension handle 322 serving as an extended grip extends forward from the upper corner 312A and is disposed adjacent to the front of the main body handle 321. A blade 352 serving as a tip tool is provided at the front end of the lawn mower 300, and the blade 352 swings left and right by the driving force of the motor 330.

[0085] Furthermore, a return portion 323 extends downward from the front end of the extension handle portion 322, and the lower end of the return portion 323 is bent rearward and connected to the main body housing 312. As a result, the main body housing 312 is formed with a handle hole 324 as a hole portion and a finger hook 325 as a hook portion.

[0086] As described above, in the lawn mower 300, a portion of the upper end of the main housing 312 serves as the main handle 321, and the rear of the operator's hand, which is placed from above, is supported by the main handle 321. Furthermore, a plate-shaped extension handle 322 extends forward from the outer periphery of the upper end of the main housing 312 and is positioned adjacent to the front of the main handle 321. The front of the operator's hand is supported by the extension handle 322. Therefore, in the lawn mower 300, the size of the lawn mower 300 can be made smaller than when the upper handle 320 is configured only with the extension handle 322. This contributes to improving the convenience of the lawn mower 300.

[0087] In addition, in the chainsaw 1 of this embodiment, the extension handle 22 of the upper handle 20 is integrally formed with the main housing 12. However, the extension handle 22 may be formed separately from the main housing 12 and then assembled to the main housing 12. For example, as shown in FIG. 14A , the front end of the extension handle 22 may be connected to the main housing 12 so as to be rotatable about an axis AL perpendicular to the rear upper wall 14C. In this case, the lower end of the return portion 23 is cut off, forming the handle hole 24 as a partially open hole. As a result, as shown in FIG. 14B , the extension handle 22 can be used as a hook by rotating it relative to the main housing 12. This allows the chainsaw 1 to be hung on a specific location without using an accessory 90, such as a carabiner.

[0088] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0089] 1 Chainsaw (working machine) 12 Main body housing 14C Rear upper wall (cover wall portion) 14E Rear air intake (ventilation port) 15 Lower handle (second handle) 20 Upper handle (first handle) 21 Main body side handle portion (main body side grip portion) 22 Extension handle portion (extension grip portion) 23 Return portion 24 Handle hole portion (hole portion) 25 Finger hook portion (hanging portion) 44 Trigger (operating portion) 52 Saw chain (tip tool) 52A Processing portion 100 Palm sander (working machine) 120 Upper handle (first handle) 121 Main body side handle portion (main body grip portion) 122 Extension handle portion (extension grip portion) 123 Return portion 124 Handle hole portion (hole portion) 125 Finger hook portion (hanging portion) 130 Motor 152 Grinding wheel (tip tool) 200 Saber saw (working machine) 220 Upper handle (first handle) 221, main body side handle portion (main body grip portion) 222, extension handle portion (extension grip portion) 223, barb portion 224, handle hole portion (hole portion) 225, finger hook portion (hook portion) 230, motor 252, blade (tip tool) 300, lawn mower (work machine) 320, upper handle (first handle) 321, main body side handle portion (main body grip portion) 322, extension handle portion (extension grip portion) 323, barb portion 324, handle hole portion (hole portion) 325, finger hook portion (hook portion) 330, motor 352, blade (tip tool) AL, axis line OL, overhead line

Claims

1. A working machine comprising: a motor; a tip tool driven by receiving the driving force of the motor; a main body housing that houses the motor and has a main body side gripping portion on its outer peripheral portion; and a plate-shaped extended gripping portion that extends from the outer peripheral portion of the main body housing toward one side in a first direction as viewed from a predetermined direction and is disposed adjacent to the one side of the main body side gripping portion in the first direction, wherein a boundary portion between the main body side gripping portion and the extended gripping portion is bent so as to protrude toward one side in a second direction that intersects the first direction as viewed from the predetermined direction.

2. The working machine according to claim 1, wherein a first handle is constituted by the main body side gripping portion and the extended gripping portion, a second handle gripped by the other hand of an operator is connected to the main body housing, the second handle is formed in a columnar shape extending from the main body housing on the other side in the second direction than the first handle, and an operation portion operated by the operator is provided on the second handle.

3. The working machine according to claim 2, wherein the tip tool protrudes from the main body housing toward the other side in the first direction, and the second handle extends from the main body housing toward one side in the first direction.

4. The working machine according to claim 1, wherein the main body side gripping portion covers the motor from one axial side, the main body housing has a cover wall portion that covers the motor from the radially outer side, the extended gripping portion extends from the cover wall portion toward one side in the first direction and is disposed spaced apart from the cover wall portion on the one side in the first direction.

5. The working machine according to claim 4, wherein, as viewed from the predetermined direction, an extension length of the main body side gripping portion is 60 mm or less, and a sum of the extension length of the main body side gripping portion and the extension length of the extended gripping portion is 90 mm or more.

6. The working machine according to claim 4, wherein a vent hole that communicates between the inside and the outside of the main body housing is formed in the cover wall portion.

7. The working machine according to claim 1, wherein an angle formed between the main body side gripping portion and the extended gripping portion as viewed from the predetermined direction is an obtuse angle.

8. The working machine according to claim 1, wherein a return portion extending toward the other side in the second direction is formed at a tip portion of the extended gripping portion, and a hole portion surrounded by the main body housing, the extended gripping portion, and the return portion is formed as viewed from the predetermined direction.

9. The tip of the return part is connected to the main body housing, and a hanging part that is open to one side in the first direction is formed at the connection part between the return part and the main body housing when viewed from a predetermined direction. The working machine according to claim 8.

10. The other end part in the second direction of the tip tool is a processing part for processing a workpiece, and an overhead line that passes through the processing part and extends along the first direction passes through the center of the second handle when viewed from the predetermined direction. The working machine according to claim 3.

11. When viewed from the predetermined direction, a part of one hand of an operator attached from one side in the second direction is received by the main body side gripping part, and the other part of the hand is received by the extension gripping part. The working machine according to claim 1.

12. A working machine comprising: a main body housing having a motor, a motor housing part that houses the motor, and a gear housing part that houses a power transmission part for transmitting the power of the motor; a tip tool that extends forward from the front part of the main body housing and is driven by receiving the driving force of the motor; a first handle including an extension gripping part that extends rearward from the upper part of the motor housing part; and a second handle that extends rearward from the rear part of the gear housing part and is provided with an operation part for controlling the driving of the motor.

13. The extension gripping part is plate-shaped, and a hole part that penetrates in the left-right direction is formed between it and the main body housing by connecting the other end part to the rear part of the motor housing part. The working machine according to claim 12.

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