Work machine

Abstract

To improve workability.SOLUTION: A circular saw 10 is so constituted that a right / left-directional center position 18B of a base-side sub handle 18 is offset to the left from a main handle 26D, and a right / left-directional center position 36B of a battery 36 is offset to the left from the base-side sub handle 18. Namely, the base-side sub handle 18 is arranged between the main handle 26D and a battery 36 when viewed from a front / rear direction. Consequently, while visibility to the base-side sub handle 18 is improved, a worker who is located behind a circular saw body 20 can grip the base-side sub handle 18. Further, the worker who grips, for example, the base-side sub handle 18 can be suppressed from having his or her arm interfering with the battery 36. Consequently, the workability of the circular saw 10 can be improved.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] In the circular saw (working machine) described in Patent Document 1 below, a circular saw body is provided above a base. The circular saw body has a handle, which is located above a battery. When cutting with the circular saw, an operator grasps the handle and slides the base forward onto the workpiece. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Application No. 2024-34402 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, some relatively large circular saws have a sub-handle attached to the base, allowing the operator to hold the handle with one hand and the sub-handle with the other to perform cutting, thereby improving the operability of the circular saw.

[0005] However, when a sub-handle is attached to the base of a circular saw, the positional relationship between the sub-handle and the components that make up the circular saw may reduce the operability of the circular saw. For this reason, it is desirable to attach the sub-handle to a position that improves operability, taking into account the positional relationship with other components of the circular saw.

[0006] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a work machine that can improve workability. [Means for solving the problem]

[0007] One or more embodiments of the present invention are a work machine comprising: a base; a main body connected to the base and having a circular saw blade, the main body including: a housing arranged above the base; a motor housed in the housing; a main handle provided on the housing and having a trigger for turning the motor on and off, the main handle being held by an operator; a sub-handle provided on the base and held by an operator, the sub-handle having a left-right center position offset to one side in the left-right direction relative to the main handle; and a battery attached to the housing and having a left-right center position offset to one side in the left-right direction relative to the sub-handle.

[0008] One or more embodiments of the present invention are a work machine in which, when viewed from the front-to-back direction, the center of gravity of the motor is located on the other left-to-right side of the battery and in a position that does not overlap with the battery, and when viewed from above, the center of gravity of the entire work machine overlaps with the main handle.

[0009] One or more embodiments of the present invention are directed to a work machine in which the trigger is disposed in a position that does not overlap the battery when viewed in the left-right direction.

[0010] In one or more embodiments of the present invention, the trigger has an operating surface that is operated by an operator, and the operating surface is located forward of the battery.

[0011] In one or more embodiments of the present invention, the housing has a saw cover that covers the circular saw blade, the saw cover is located on the other left-right side of the main handle, and when viewed from the left-right direction, the saw cover, the main handle, and the battery are partially overlapping each other.

[0012] One or more embodiments of the present invention are a work machine in which the main handle is inclined forward as it moves upward when viewed from the left to right, and the lower end of the main handle is located below the center position of the battery in the up-down direction.

[0013] One or more embodiments of the present invention are a work machine in which the housing is provided with a controller that controls the motor, the controller being arranged on one side of the motor in the left-right direction and overlapping the battery when viewed from the front-to-back direction.

[0014] One or more embodiments of the present invention are directed to a work machine in which the center of gravity of the entire work machine overlaps with the lower end of the main handle when viewed in the front-rear direction.

[0015] One or more embodiments of the present invention are a work machine in which a first gap into which an operator's hand can be inserted is formed between the saw cover and the main handle in the left-right direction, and a second gap into which an operator's hand can be inserted is formed between the main handle and the battery in the left-right direction.

[0016] One or more embodiments of the present invention are directed to a work machine in which the dimension of the first gap and the dimension of the second gap in the left-right direction are set to be approximately the same.

[0017] In one or more embodiments of the present invention, the underside of the base is formed with a guide groove that extends in the fore-and-aft direction and is fitted so as to be movable in the fore-and-aft direction onto a guide rail that guides the direction of travel of the work machine, and the sub-handle is positioned above the guide groove.

[0018] One or more embodiments of the present invention are directed to a work machine in which the sub-handle overlaps a front end of the saw cover when viewed in the left-right direction.

[0019] One or more embodiments of the present invention are a work machine having a cutting depth adjustment mechanism that can change the amount of downward protrusion of the circular saw blade from the underside of the base, and the inclination angle of the main handle relative to the underside of the base when the protrusion amount is maximum is 35 degrees to 55 degrees. [Effects of the Invention]

[0020] According to one or more embodiments of the present invention, workability can be improved. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a plan view showing a circular saw according to an embodiment of the present invention, viewed from above; [Figure 2] 2 is a side view of the circular saw shown in FIG. 1 as seen from the left side. [Figure 3] 2 is a front view of the circular saw shown in FIG. 1 as seen from the front side. [Figure 4] 2 is a rear view of the circular saw shown in FIG. 1 as seen from the rear side. [Figure 5] 3 is a side view of the main handle and its surroundings of the circular saw shown in FIG. 2, viewed from the left side with the battery removed. FIG. [Figure 6] 6 is a cross-sectional view (cross-sectional view taken along line 6-6 in FIG. 2) showing the inside of the circular saw body shown in FIG. 2 as seen from above. [Figure 7] 7 is a cross-sectional view (cross-sectional view taken along line 7-7 in FIG. 6) showing the inside of the motor housing shown in FIG. 6 as seen from the front side. [Figure 8] 4 is a front view showing a state in which the circular saw body has been tilted 45 degrees by the tilting mechanism from the state shown in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following describes a circular saw 10 as a work machine according to this embodiment, with reference to the drawings. Note that the arrows UP, FR, and LH shown as appropriate in the drawings respectively indicate the upper side, front side, and left side of the circular saw 10. In the following description, when the up / down, front / rear, and left / right directions are used, they refer to the up / down, front / rear, and left / right directions of the circular saw 10 unless otherwise specified.

[0023] 1 to 4, the circular saw 10 is an electric power tool for cutting workpieces. The circular saw 10 includes a base 12 and a circular saw body 20 as a main body.

[0024] (Base 12) The base 12 is formed in a generally rectangular plate shape with the thickness direction extending vertically and the length direction extending forward and backward. When cutting with the circular saw 10, the base 12 is placed on the workpiece and moved forward. An insertion portion 12A (see FIG. 1) for accommodating the circular saw blade 14 is formed through the right portion of the base 12. The insertion portion 12A is formed in a generally rectangular shape with the length direction extending forward and backward, and is a through hole with a width in the vertical direction.

[0025] 3, 4, and 6, the circular saw blade 14 is formed in a generally circular plate shape with its thickness in the left-right direction, and the center of the circular saw blade 14 is fixed to an output shaft 54 ​​of the drive mechanism 40, which will be described later. A part of the circular saw blade 14 is disposed within the insertion portion 12A of the base 12, with an upper portion of the circular saw blade 14 protruding upward from the base 12 and a lower end portion of the circular saw blade 14 protruding downward from the base 12.

[0026] A guide groove 12B is formed at the left end of the underside of the base 12. The guide groove 12B is a groove that extends in the front-to-rear direction, is open downward, and penetrates in the front-to-rear direction. The guide groove 12B is a groove that fits into a rail portion 16A of a guide rail 16 (see FIG. 3) that is arranged on the underside of the base 12. The guide rail 16 is an auxiliary member that assists in straight cutting. When working using the guide rail 16, the guide groove 12B fits into the rail portion 16A, and the guide rail 16 guides the forward movement of the base 12 (circular saw 10).

[0027] As shown in Figures 1 to 3, a base-side sub-handle 18 is provided as a sub-handle at the front end of the left end of the base 12. The base-side sub-handle 18 protrudes upward from the base 12, and a grip portion 18A bent forward is formed at the upper end of the base-side sub-handle 18. The grip portion 18A is configured as a portion to be held by the operator, and both left and right ends of the grip portion 18A protrude outward in the left and right directions from the rear of the base-side sub-handle 18. The base-side sub-handle 18 is disposed above the guide groove 12B. Specifically, the left-right center position 18B of the base-side sub-handle 18 coincides with the widthwise center position of the guide groove 12B (see Figure 3).

[0028] (Regarding the circular saw body 20) As shown in FIGS. 1 to 7, the circular saw body 20 includes a housing 22, a battery 36, and a drive mechanism 40.

[0029] (Regarding Housing 22) The housing 22 is made up of multiple housing members, forms the outer shell of the circular saw body 20, and is disposed above the base 12. The housing 22 includes a saw cover 24 that covers the circular saw blade 14, and a motor housing 26 that houses the drive mechanism 40, which will be described later.

[0030] The saw cover 24 is made of metal and forms the right end of the housing 22. The saw cover 24 is formed in a generally semicircular plate shape with its thickness extending in the left-right direction and convex upward, and is formed in a concave shape that is open downward. The upper part of the circular saw blade 14 is housed in and covered by the saw cover 24. The fore-and-aft position of the base-side sub-handle 18 is set so that the base-side sub-handle 18 overlaps the front end of the saw cover 24 in a side view from the left-and-right direction. More specifically, the rear end of the base-side sub-handle 18 overlaps the front end of the circular saw blade 14 in a side view.

[0031] The front end of the saw cover 24 is connected to the base 12 by a tilting mechanism 30, with the front-to-rear direction as the axial direction. The tilting mechanism has an arc guide 30A and a fixed knob 30B. The arc guide 30A is held by the base 12, and the fixed knob 30B is held by the circular saw body 20. The fixed knob 30B includes a rotatable bolt. Loosening the fixed knob 30B releases the fixed position of the circular saw body 20 relative to the base 12, allowing the circular saw body 20 to be tilted. When the circular saw body 20 is tilted, the fixed knob 30B moves within the arc guide 30A. Tightening the fixed knob 30B at the desired position fixes the position of the circular saw body 20 relative to the base 12. In this embodiment, when the tilting mechanism 30 is operated by an operator, the circular saw body 20 is tilted to the right about an imaginary axis AX (see FIG. 3 ) extending in the front-to-rear direction, thereby adjusting the cutting angle of the circular saw blade 14 on the workpiece. Figure 8 shows the circular saw body 20 tilted (inclined) 45 degrees to the right around an imaginary axis AX (see Figure 3). The front end of the saw cover 24 is connected to the tilting mechanism 30 by a cutting depth adjustment mechanism 32 so as to be rotatable about the left-right direction as the axial direction. Specifically, the front end of the saw cover 24 is connected to the tilting mechanism 30 by a rotation shaft 34 (see Figures 1 and 2) whose axial direction is the left-right direction. When the cutting depth adjustment mechanism 32 is operated by an operator, the circular saw body 20 rotates so that the rear end of the saw cover 24 is raised, thereby adjusting the cutting depth of the circular saw blade 14 in the workpiece (the amount by which the circular saw blade 14 protrudes from the underside of the base 12).

[0032] A housing connection portion 24A is provided on the left side of the saw cover 24. The housing connection portion 24A is formed as a substantially rectangular cylinder with its axis extending in the left-right direction and protruding to the left from the saw cover 24. As shown in FIGS. 6 and 7 , a partition wall 24B is formed inside the housing connection portion 24A, and the interior of the housing connection portion 24A is partitioned in the left-right direction by the partition wall 24B. A first housing cylinder portion 24C is formed in the approximate center of the partition wall 24B. The first housing cylinder portion 24C is formed as a substantially cylindrical shape and protrudes to the left from the partition wall 24B. A second housing cylinder portion 24D is formed in the housing connection portion 24A diagonally below and rearward of the first housing cylinder portion 24C. The second housing cylinder portion 24D is formed as a substantially stepped, bottomed cylinder that opens to the right and protrudes to the left from the partition wall 24B. A duct connection hole 24E is formed in the front wall of the housing connection portion 24A in the vertical middle portion, and the duct connection hole 24E penetrates in the front-rear direction and opens to the left.

[0033] As shown in FIGS. 1 to 7, the motor housing 26 is made of resin and is formed as a generally rectangular cylinder with a bottom that is open to the right. The motor housing 26 is disposed on the left side of the housing connection portion 24A of the saw cover 24 and is fastened and fixed to the housing connection portion 24A. The motor housing 26 is also disposed behind the base-side sub-handle 18 with a predetermined gap therebetween. A plurality of air intake ports 26A are formed in the left wall (bottom wall) of the motor housing 26. The air intake ports 26A are formed as elongated holes with the longitudinal direction extending in the front-to-rear direction, and the interior and exterior of the motor housing 26 are connected by the air intake ports 26A.

[0034] A battery mounting section 26B is provided at the left end of the rear wall of the motor housing 26. A battery 36 is mounted from above in the battery mounting section 26B. The battery 36 is electrically connected to a controller 42 (described later) and a motor 44 of the drive mechanism 40. When the battery 36 is mounted, an upper portion of the battery 36 protrudes upward beyond the motor housing 26. In addition, in a side view, the entire battery 36 overlaps with the rear portion of the saw cover 24. Furthermore, in a front view seen from the front, the battery 36 is located to the right of a center position 18B in the left-right direction of the base-side sub-handle 18 (see FIGS. 1 and 3).

[0035] A handle base portion 26C is provided at the right end of the upper wall of the motor housing 26, and the handle base portion 26C extends obliquely upward and forward from the motor housing 26. A main handle 26D is provided at the right end of the motor housing 26, behind the handle base portion 26C. In a side view, the main handle 26D slopes forward as it extends upward. The front end portion of the main handle 26D bends obliquely downward and forward and is connected to the upper end portion of the handle base portion 26C. As a result, the upper end portion 26D1 of the main handle 26D is formed in a generally inverted V-shape that opens downward in a side view. Meanwhile, the lower end portion 26D2 of the main handle 26D bends forward and is connected to the rear wall of the motor housing 26 (see FIG. 5). The main handle 26D is bent downward above the lower end portion 26D2, smoothly connecting to the lower end portion 26D2. The tilt angle AG (see FIG. 5) of the main handle 26D relative to the front-rear direction is set to approximately 45 degrees.

[0036] The main handle 26D is disposed between the rear of the saw cover 24 and the battery 36. Specifically, in a side view, a lower portion of the main handle 26D overlaps the saw cover 24 and the battery 36. Furthermore, in a side view, a lower end portion 26D2 of the main handle 26D is located below a vertical center position 36A (see FIG. 2) of the battery 36. More specifically, in a side view, the vertical position of the lower end portion 26D2 of the main handle 26D is set so that the lower end portion 26D2 is located rearward of an axis CL of a motor shaft 44A (described later) (see FIG. 2). Furthermore, in a side view, an upper end portion 26D1 of the main handle 26D overlaps the saw cover 24, and an upper end 26D3 of the main handle 26D protrudes slightly upward from the saw cover 24. Furthermore, the front-rear position of the upper end 26D1 of the main handle 26D is set so that the upper end 26D1 of the main handle 26D is disposed between the axis CL of the motor shaft 44A and the battery 36 in the front-rear direction in a side view.

[0037] In the left-right direction, a first gap GP1 (see FIGS. 1 and 3) is formed between the saw cover 24 and the main handle 26D, and a second gap GP2 (see FIGS. 1 and 3) is formed between the main handle 26D and the battery 36. The left-right dimensions of the first gap GP1 and the second gap GP2 are set to be approximately the same and are set to a dimension that allows an operator's hand to be inserted. In this embodiment, the left-right dimensions of the first gap GP1 and the second gap GP2 are set to be approximately 40 mm.

[0038] Furthermore, when viewed from the front, the left-right center position 18B of the aforementioned base side sub-handle 18 is offset to the left (one side in the left-right direction) relative to the main handle 26D, and the left-right center position 36B of the battery 36 is offset to the left relative to the base side sub-handle 18.

[0039] A main body sub-handle 26E is provided at the upper end of the handle base 26C of the motor housing 26, and extends forward from the handle base 26C. A grip portion 26E1 to be gripped by the operator is provided at the front end of the main body sub-handle 26E, and both left and right ends of the grip portion 26E1 protrude outward in the left and right direction beyond the main body sub-handle 26E. The grip portion 26E1 is located above the base sub-handle 18 in a side view. When cutting with the circular saw 10, the operator holds the main handle 26D with one hand and holds the grip portion 18A of the base sub-handle 18 or the grip portion 26E1 of the main body sub-handle 26E with the other hand.

[0040] An operable trigger 38 is provided on the upper end 26D1 of the main handle 26D. The trigger 38 protrudes from the main handle 26D toward the handle base 26C, and the surface of the trigger 38 facing the handle base 26C is an operation surface 38A. When the operator presses the operation surface 38A of the trigger 38 upward, a switch (not shown) housed inside the main handle 26D is pressed. This switch is electrically connected to a controller 42 (described later), and is turned on in response to operation of the trigger 38, thereby activating a drive mechanism 40 (described later).

[0041] The position of the trigger 38 relative to the battery 36 in the up-down and front-rear directions is set so that the trigger 38 does not overlap with the battery 36 in a side view (see FIG. 2). In addition, the position of the trigger 38 relative to the battery 36 in the front-rear direction is set so that the operating surface 38A of the trigger 38 is located in front of the battery 36 in a side view.

[0042] (Regarding the drive mechanism 40) As shown in FIGS. 6 and 7, the drive mechanism 40 includes a controller 42, a motor 44, and an output shaft 54. The controller 42 is housed in the left end of the motor housing 26. The controller 42 includes a controller case 42A and a circuit board 42B. The controller case 42A is made of metal and has a relatively shallow, generally rectangular box shape that is open to the right and is held in the motor housing 26. The circuit board 42B has a generally rectangular plate shape with its thickness extending in the left-right direction and is disposed within and held by the controller case 42A. Electronic components such as switching elements for controlling the motor 44, which will be described later, are mounted on the circuit board 42B. The controller 42 is disposed in front of the battery 36 and overlaps the lower part of the battery 36 in a front view.

[0043] The motor 44 is a brushless motor. The motor 44 is housed in the motor housing 26 to the right of the controller 42 and is electrically connected to the controller 42. That is, the motor 44 is disposed forward of the battery 36. The motor 44 includes a motor shaft 44A whose axial direction is the left-right direction, a rotor 44B disposed radially outward of the motor shaft 44A, and a stator 44C disposed radially outward of the rotor 44B. The left end of the motor shaft 44A is rotatably supported by a motor bearing 46 fixed to the motor housing 26. The right end of the motor shaft 44A is rotatably supported by a motor bearing 48 fixed to the first housing cylindrical portion 24C of the housing connection portion 24A of the saw cover 24. A pinion gear is formed on the right end of the motor shaft 44A, to the right of the motor bearing 48. In addition, the center of gravity G2 of the motor 44 is located to the right of the battery 36 in a front view so as not to overlap with the battery 36.

[0044] A fan 50 is mounted on the motor shaft 44A so as to be rotatable integrally with the motor shaft 44A, and is disposed between the rotor 44B and stator 44C and the saw cover 24. The fan 50 is a so-called centrifugal fan, and when rotated by the motor 44, generates an airflow AR that flows into the motor housing 26 through the air intake port 26A of the motor housing 26. A fan guide 52 is provided inside the motor housing 26 on the radial outside of the fan 50, and the fan guide 52 causes the airflow AR to flow toward the housing connection portion 24A. This allows the controller 42 and the motor 44 to be cooled by the airflow AR.

[0045] The circular saw body 20 has an exhaust duct 70 (see FIGS. 1 to 3 and 6) that exhausts the airflow AR to the front side of the tilt mechanism 30. The exhaust duct 70 has a rear duct portion 70A fixed to the left side of the front end of the saw cover 24 and a front duct portion 70B fixed to the tilt mechanism 30. The front end of the rear duct portion 70A and the rear end of the front duct portion 70B are connected to each other and are rotatably coupled about the axis of the rotation shaft 34. The rear end of the rear duct portion 70A is disposed in the duct connection hole 24E of the saw cover 24, and the front end of the front duct portion 70B is located in front of the tilt mechanism 30. As a result, the airflow AR flows into the exhaust duct 70 and is exhausted from the front end of the exhaust duct 70 to the front side of the circular saw body 20 (see FIG. 6).

[0046] The output shaft 54 ​​is disposed within the second tubular housing portion 24D of the housing connection portion 24A of the saw cover 24, with the left-right direction as the axial direction, and is located below the motor shaft 44A. The left end of the output shaft 54 ​​is rotatably supported by a bearing 56 fixed to the left end of the second tubular housing portion 24D, and an intermediate portion of the output shaft 54 ​​in the axial direction is rotatably supported by a bearing (not shown). An output gear 60 is provided at the intermediate portion of the output shaft 54 ​​in the axial direction so as to be integrally rotatable, and the output gear 60 is meshed with the pinion gear of the motor shaft 44A.

[0047] The center of the circular saw blade 14 is fixed to the right end of the output shaft 54 ​​by a fixing bolt 62. Specifically, the center of the circular saw blade 14 is sandwiched between washer members 64 from the outside in the left-right direction, and the washer members 64 are fastened and fixed to the output shaft 54 ​​by the fixing bolt 62. As a result, when the motor 44 is driven, the circular saw blade 14 is configured to rotate together with the output shaft 54 ​​around the axis of the output shaft 54 ​​to one side.

[0048] The lower part of the circular saw blade 14 is covered with a protective cover 66 (FIGS. 2 to 4). The protective cover 66 is formed in a generally semicircular shape that is convex downward when viewed from the right side, and is formed in a concave shape that is open upward. The protective cover 66 is connected to the output shaft 54 ​​so as to be rotatable about the axis of the output shaft 54. The protective cover 66 is urged about the axis of the output shaft 54 ​​by a spring (not shown) and is held in the position shown in FIGS. 2 to 4. When cutting with the circular saw 10, the protective cover 66 is rotated about the axis of the output shaft 54 ​​against the urging force of the spring by the workpiece, exposing the cutting portion of the circular saw blade 14.

[0049] (Regarding the position of the center of gravity G1 of the circular saw 10) 1 to 4, the center of gravity G1 of the circular saw 10 is located at a position overlapping with the main handle 26D in a plan view. Specifically, the center of gravity G1 of the circular saw 10 overlaps with the lower end 26D2 of the main handle 26D in a rear view, and is located below the upper end 26D1 of the main handle 26D in a side view.

[0050] (Action and effect) Next, the operation and effects of this embodiment will be described.

[0051] When cutting using the circular saw 10, the operator holds the main handle 26D with one hand and the base-side sub-handle 18 with the other. When the operator presses the operating surface 38A of the trigger 38 upward with one hand, the motor 44 is driven and the circular saw blade 14 rotates. Then, when the operator pushes the main handle 26D and the base-side sub-handle 18 forward, the base 12 moves forward over the workpiece. This causes the circular saw blade 14 to cut the workpiece. As shown in FIG. 8, the position of the base-side sub-handle 18 does not change even when the circular saw body 20 is tilted, which provides better operability than a configuration in which two sub-handles are attached to the circular saw body 20.

[0052] In the circular saw 10, the left-right center position 18B of the base-side sub-handle 18 is offset to the left relative to the main handle 26D, and the left-right center position 36B of the battery 36 is offset to the left relative to the base-side sub-handle 18. That is, when viewed from the front-to-rear direction, the base-side sub-handle 18 is disposed between the main handle 26D and the battery 36. This allows an operator positioned behind the circular saw body 20 to grip the base-side sub-handle 18 while improving visibility of the base-side sub-handle 18. Furthermore, because the left-to-right center position 36B of the battery 36 is offset to the left relative to the base-side sub-handle 18, for example, interference between the operator's arm gripping the base-side sub-handle 18 and the battery 36 can be prevented. In particular, interference between the battery 36, which protrudes above the motor housing 26, and the operator's arm can be effectively prevented. Therefore, from the viewpoint of improving workability, the base-side sub-handle 18 can be disposed in a position that improves the positional relationship between the battery 36 and the main handle 26D. As a result, the operability of the circular saw 10 can be improved.

[0053] Furthermore, in a front view, the center of gravity G2 of the motor 44 is disposed at a position offset to the right of the battery 36, and in a plan view, the center of gravity G1 of the circular saw 10 overlaps with the main handle 26D. That is, by disposing the motor 44 closer to the main handle 26D with respect to the battery 36, the center of gravity G1 of the circular saw 10 can be positioned above the main handle 26D that is held by the operator in a plan view. This allows the motor 44 and battery 36 provided in the motor housing 26 to be disposed in positions that contribute to improved balance performance.

[0054] Furthermore, the trigger 38 is positioned so as not to overlap the battery 36 in a side view. Specifically, the operating surface 38A of the trigger 38 is positioned forward of the battery 36. This allows the trigger 38 to be provided on the main handle 26D while suppressing interference between the operator's fingers and the battery 36, even if the battery 36 is configured to be positioned on the left side of the main handle 26D. Therefore, the battery 36 can be positioned on the left side of the main handle 26D while suppressing a decrease in operability of the trigger 38.

[0055] Furthermore, the saw cover 24, which covers the circular saw blade 14, is located to the right of the main handle 26D, and in a side view, the saw cover 24, the main handle 26D, and the battery 36 partially overlap each other. Specifically, in a side view, the lower part of the main handle 26D overlaps the saw cover 24 and the battery 36. This allows the inclination angle AG of the main handle 26D to be increased without setting the vertical position of the upper end 26D1 of the main handle 26D excessively high. In other words, the inclination angle AG of the main handle 26D (45 degrees in this embodiment) can be increased while preventing the circular saw 10 from becoming too large in size in the vertical direction. This allows the operator to easily push the main handle 26D, which has a large inclination angle AG, forward during cutting operations using the circular saw 10. As a result, workability during cutting operations can be effectively improved. The inclination angle of the main handle 26D is 45 degrees, which is suitable for cutting work in which the circular saw body 20 is advanced forward while the base 12 is pressed downward, but it may be in the range of 35 to 55 degrees. Note that the handle angle at this time is the angle when the cutting depth adjustment mechanism 32 maximizes the cutting depth of the circular saw blade 14 into the workpiece.

[0056] The motor housing 26 is also provided with a controller 42, which is disposed to the left of the motor 44 and overlaps the battery 36 in a front view. This allows the saw cover 24, which is a heavy object, to be disposed to the right of the main handle 26D, and the battery 36 and controller 42, which are also heavy objects, to be disposed together to the left of the main handle 26D. This allows the circular saw 10 to have a well-balanced layout.

[0057] Furthermore, the main handle 26D is tilted forward as it extends upward in a side view, and a lower end 26D2 of the main handle 26D is located below the vertical center position 36A of the battery 36. This ensures that the vertical dimension of the main handle 26D is sufficient, and allows the tilt angle AG of the main handle 26D to be set large.

[0058] In addition, in the left-right direction, a first gap GP1 is formed between the saw cover 24 and the main handle 26D, and a second gap GP2 is formed between the main handle 26D and the battery 36. The left-right dimensions of the first gap GP1 and the second gap GP2 are set to be approximately the same and are set to be large enough to allow an operator's hand to be inserted therethrough. This allows the gripping performance of the main handle 26D to be equivalent when a right-handed operator grips the main handle 26D with their right hand and when a left-handed operator grips the main handle 26D with their left hand. In this embodiment, the left-right dimensions of the first gap GP1 and the second gap GP2 are approximately the same, but the left-right dimension of the second gap GP2 may be in the range of 0.8 to 1.2 times that of the first gap GP1.

[0059] Furthermore, in a rear view, the center of gravity G1 of the circular saw 10 overlaps the lower end 26D2 of the main handle 26D. Therefore, the center of gravity G1 of the circular saw 10 is located below the portion of the main handle 26D that the operator primarily grips. More specifically, the operator grips the area around the trigger 38 provided at the upper end 26D1 of the main handle 26D, and in a side view, the center of gravity G1 of the circular saw 10 is located below the upper end 26D1 of the main handle 26D. Therefore, the center of gravity G1 of the circular saw 10 is located approximately directly below the portion that the operator primarily grips. This allows the circular saw 10 to maintain good balance when the operator grips the main handle 26D and lifts the circular saw 10. As a result, for example, the portability of the circular saw 10 can be improved.

[0060] Furthermore, a guide groove 12B is formed on the underside of the base 12, and the base-side sub-handle 18 is disposed above the guide groove 12B. More specifically, the center position 18B of the base-side sub-handle 18 in the left-right direction coincides with the center position of the guide groove 12B in the width direction. Therefore, when cutting using the guide rail 16, a forward pushing force can be applied to the base 12 while pressing the base 12 downward from above the guide groove 12B. This prevents the base 12 from lifting off the guide rail 16, and allows the guide groove 12B to slide forward smoothly along the rail portion 16A of the guide rail 16. Therefore, workability during cutting using the guide rail 16 can be effectively improved.

[0061] Furthermore, in a side view, the base-side sub-handle 18 overlaps the front end of the saw cover 24. More specifically, in a side view, the rear end of the base-side sub-handle 18 overlaps the front end of the circular saw blade 14. During cutting with the circular saw 10, the workpiece is cut primarily at the front end of the circular saw blade 14. This allows the front-to-rear position of the portion of the circular saw blade 14 that cuts the workpiece to be approximately aligned with the front-to-rear position of the base-side sub-handle 18. In other words, the base-side sub-handle 18 can be positioned to the left of the portion of the circular saw blade 14 that cuts the workpiece, allowing the base 12 to be pressed against the workpiece by the base-side sub-handle 18. This further improves operability during cutting.

[0062] Furthermore, 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. [Explanation of symbols]

[0063] 10 Circular saw (working machine) 12 base 12B Guide groove 16 Guide rail 18 Base side sub-handle (sub-handle) 18B Center position of the sub-handle in the left-right direction 20 Circular saw body (main body) 22 Housing 24 Saw Cover 26D main handle 26D1 Upper end of main handle 26D2 Lower end of main handle 36 Battery 36A Battery vertical center position 36B Center position of battery in the left-right direction 38 Trigger 38A Operation surface 42 Controller 44 Motor G2 Motor Center of Gravity G1 Center of gravity of work equipment GP1 1st gap GP2 2nd gap

Claims

1. With the base, a main body connected to the base and having a circular saw blade; Equipped with The main body portion is a housing disposed above the base; a motor housed in the housing; a main handle provided on the housing, the main handle having a trigger for turning the motor on and off, and adapted to be gripped by an operator; a sub-handle provided on the base, gripped by an operator, and having a center position in the left-right direction offset to one side in the left-right direction relative to the main handle; a battery attached to the housing, the center position of which is offset to one side in the left-right direction relative to the sub-handle; A work machine comprising:

2. A work machine as described in claim 1, wherein when viewed from the front-to-rear direction, the center of gravity of the motor is located on the other left-to-right side of the battery and in a position that does not overlap with the battery, and when viewed from above, the center of gravity of the entire work machine overlaps with the main handle.

3. The work machine according to claim 1 , wherein the trigger is disposed at a position that does not overlap the battery when viewed from the left and right.

4. the trigger has an operation surface that is operated by an operator, The work machine according to claim 3, wherein the operation surface is located forward of the battery.

5. The housing has a saw cover that covers the circular saw blade, and the saw cover is located on the other side of the main handle in the left-right direction. The work machine according to claim 1 , wherein the saw cover, the main handle, and the battery are partially overlapped with each other when viewed in the left-right direction.

6. The main handle is inclined forward as it goes upward when viewed in the left-right direction, 6. The work machine according to claim 5, wherein a lower end of the main handle is located below a center position of the battery in the up-down direction.

7. a controller for controlling the motor is provided in the housing; The work machine according to claim 5, wherein the controller is disposed on one side of the motor in the left-right direction and overlaps the battery when viewed in the front-rear direction.

8. The work machine according to claim 6, wherein the center of gravity of the entire work machine is aligned with a lower end of the main handle when viewed in the front-rear direction.

9. a first gap into which an operator can insert his / her hand is formed between the saw cover and the main handle in the left-right direction; The work machine according to claim 6, wherein a second gap into which an operator's hand can be inserted is formed between the main handle and the battery in the left-right direction.

10. The work machine according to claim 9, wherein the dimension of the first gap and the dimension of the second gap in the left-right direction are set to be approximately the same.

11. A guide groove is formed on the underside of the base, the guide groove extending in the front-rear direction and fitted to a guide rail that guides the direction of travel of the work machine so as to be movable in the front-rear direction, The work machine according to claim 1, wherein the sub-handle is disposed above the guide groove.

12. The work machine according to claim 6, wherein the sub-handle overlaps a front end of the saw cover when viewed in the left-right direction.

13. a cutting depth adjustment mechanism that can change the amount of downward projection of the circular saw blade from the lower surface of the base; 13. The work machine according to claim 1, wherein the inclination angle of the main handle with respect to the underside of the base when the protrusion amount is at its maximum is between 35 degrees and 55 degrees.

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