Working machine

Abstract

To provide a working machine capable of suppressing deterioration of usability caused by a finger being caught between exposed parts of a motor housing and a handle housing.SOLUTION: The left motor housing 131 has a first protrusion 213 in a portion covered by the left handle housing 151. The left handle housing 151 has a second protrusion 205 on its inner surface. The first protrusion 213 and the second protrusion 205 are configured to come into contact with each other in the folded state, or configured to come into contact with each other when the handle housing 180 is further rotated in the folding direction from the folded state. In a state in which the first protrusion 213 and the second protrusion 205 are in contact with each other, the exposed surfaces of the motor housing 170 and the handle housing 180 are not in contact with each other (a gap 208 exists).SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] A known work machine has a motor housing that houses a motor and a handle housing that is rotatably connected to the motor housing, and is configured to be switchable between a straight state in which the motor housing and the handle housing extend in approximately the same direction, and a bent state in which the handle housing rotates relative to the motor housing and extends in a direction that intersects with the motor housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-065129 [Patent Document 2] U.S. Patent No. 6,467,556 Summary of the Invention [Problem to be solved by the invention]

[0004] In a configuration in which the handle housing is rotatably connected to the motor housing, fingers can become pinched between the exposed parts of the motor housing and the handle housing. In particular, in a configuration in which the exposed parts of the motor housing and the handle housing come into contact with each other and are at the rotation limit position, fingers can easily become pinched between the exposed parts (outer surfaces) of the motor housing and the handle housing, resulting in an unpleasant user experience.

[0005] An object of the present invention is to provide a work machine that can prevent the feeling of use from being deteriorated due to fingers being pinched between the exposed portions of the motor housing and the handle housing. [Means for solving the problem]

[0006] One aspect of the present invention is a motor housing that houses a motor, the motor housing having a first exposed surface that is exposed so that the operator's fingers can touch it, and a first unexposed surface that is hidden so that the operator's fingers cannot touch it; a handle housing rotatably connected to the motor housing around a rotation axis, the handle housing having a second exposed surface that is exposed so as to be touched by an operator's fingers and a second unexposed surface that is hidden so as not to be touched by an operator's fingers, and configured to be rotatable between a straight state in which the handle housing extends in substantially the same direction as the motor housing and a bent state in which the handle housing rotates from the straight state in a bending direction and extends in a direction intersecting the motor housing; A work machine having the motor housing has a first protrusion on the first unexposed surface; the handle housing has a second protrusion on the second unexposed surface; the first protrusion and the second protrusion are configured to abut against each other in the folded state, or to abut against each other when the handle housing is further rotated in the folding direction from the folded state, The first exposed surface of the motor housing and the second exposed surface of the handle housing are configured not to come into contact with each other when the first protrusion and the second protrusion are in contact with each other. This is a work machine characterized by the above.

[0007] The present invention may be expressed as an "electric working machine," "electric tool," "electrical equipment," etc., and such expressions are also valid as aspects of the present invention. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a work machine that can prevent the deterioration of usability caused by fingers being pinched between the exposed parts of the motor housing and the handle housing. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a work machine 1 according to an embodiment. [Figure 2] FIG. [Figure 3] 3A is an exploded perspective view of the left motor housing 131 and left handle housing 151 of the work machine 1, and the detent mechanism interposed therebetween. FIG. 3B is a perspective view of the left motor housing 131 and the plate 136 extracted from FIG. 3A and viewed from a different perspective. [Figure 4] 4A is an exploded perspective view of the right motor housing 132 and right handle housing 152 of the work machine 1, and the detent mechanism interposed therebetween. FIG. 4B is a perspective view of the right motor housing 132 and the plate 156 extracted from FIG. 4A and viewed from a different perspective. [Figure 5] 1A is a perspective view of the left handle housing 151 and detent mechanism in a straight state, and the first protrusion 213 of the left motor housing 131. FIG. 1B is a perspective view of the left handle housing 151 and detent mechanism in a bent state, and the first protrusion 213 of the left motor housing 131. [Figure 6] 1A is a perspective view of the right handle housing 152 and detent mechanism in a straight state, and the first protrusion 233 of the right motor housing 132. FIG. 1B is a perspective view of the right handle housing 152 and detent mechanism in a bent state, and the first protrusion 233 of the right motor housing 132. [Figure 7] 7A is a side view of the left motor housing 131 and the left handle housing 151 in a straight state, as well as the detent mechanism interposed therebetween, as seen from the right. (B) is a side view of the handle housing 180 in a rotation limit state, where it has been further rotated in the direction opposite to the folding direction from the state of FIG. 7A. (C) is a side view of the handle housing 180 in a folded state, where it has been rotated in the folding direction from the state of FIG. 7A. (D) is a side view of the handle housing 180 in a rotation limit state, where it has been further rotated in the folding direction from the state of FIG. 7C. [Figure 8]8(A) is a side view from the left of the right motor housing 132 and the right handle housing 152 in the straight state, and the detent mechanism interposed between them. (B) is a side view of the handle housing 180 in a rotation limit state where it has been further rotated in the direction opposite to the folding direction from the state of FIG. 8(A). (C) is a side view of the handle housing 180 in a folded state where it has been rotated in the folding direction from the state of FIG. 8(A). (D) is a side view of the rotation limit state where it has been further rotated in the folding direction from the state of FIG. 8(C). DETAILED DESCRIPTION OF THE INVENTION

[0010] FIG. 1 is a perspective view of a work machine 1 according to an embodiment. FIG. 2 is a side cross-sectional view of the work machine 1. The work machine 1 is a pen-shaped driver drill. FIGS. 1 and 2 define the mutually perpendicular front-rear, up-down, and left-right directions of the work machine 1. Left and right are defined based on the operator looking forward. That is, the direction into the paper of FIG. 2 is the left direction, and the direction toward the front of the paper is the right direction.

[0011] The work machine 1 includes a clutch dial 105, a gear case 110, a motor 129, a shift knob 137, a battery 147, a motor housing 170, and a handle housing 180.

[0012] The clutch dial 105 is a torque setting unit that allows the operator to set the tightening torque of the work machine 1. By operating the clutch dial 105, the operator can adjust the clutch torque in, for example, 21 steps. In addition, by turning the clutch dial 105 to the maximum, the operator can set the machine to a drill mode in which the clutch is always in a transmission state.

[0013] The gear case 110 houses a reduction mechanism that reduces the rotation of the motor 129. The shift knob 137 is a reduction ratio changeover unit that allows the operator to change the reduction ratio of the reduction mechanism. The motor 129 rotates using the power of a battery 147 as a power source in response to the operation of a drive operation unit 141 provided on the left side surface of the motor housing 170.

[0014] The motor housing 170 is formed by fastening a left motor housing 131 and a right motor housing 132, each made of, for example, a resin molded body, together by screws or the like, and integrating them. The motor housing 170 accommodates the motor 129, the gear case 110, and the like. The handle housing 180 is formed by fastening a left handle housing 151 and a right handle housing 152, each made of, for example, a resin molded body, together by screws or the like, and detachably mounting the battery 147 to the handle housing 180. An operator grips the handle housing 180 to perform work. The handle housing 180 is connected to the motor housing 170 so as to be rotatable about a rotation axis 201. Specifically, the handle housing 180 is configured to be rotatable between a straight state in which it extends in substantially the same direction as the motor housing 170, as shown by the solid line in FIG. 2, and a bent state in which it is rotated from the straight state in a bending direction and extends in a direction intersecting the motor housing 170, as shown by the dashed-dotted line in FIG. 2.

[0015] Fig. 3(A) is an exploded perspective view of the left motor housing 131 and left handle housing 151 of the work machine 1, and the detent mechanism interposed therebetween. Fig. 3(B) is a perspective view of the left motor housing 131 and the plate 136 extracted from Fig. 3(A) and viewed from a different perspective.

[0016] The left motor housing 131 and the left handle housing 151 are each a substantially semi-cylindrical body, for example, made of resin. The left motor housing 131 is the left part of the motor housing 170 shown in Figure 2. The left handle housing 151 is the left part of the handle housing 180 shown in Figure 2.

[0017] The rear part of the left surface of the left motor housing 131 is a first non-exposed surface 214 (FIG. 3(B)), which is covered by the front part of the left handle housing 151 and is therefore hidden so as not to be touched by the operator's fingers. The outer surface of the left motor housing 131 (the surface facing the opposite side from the central axis of the left motor housing 131) is a first exposed surface that is exposed so as to be touched by the operator's fingers, excluding the first non-exposed surface 214 shown in FIG. 3(B). The inner surface of the left motor housing 131 (the surface facing the central axis of the left motor housing 131) is a non-exposed surface and is hidden so as not to be touched by the operator's fingers.

[0018] The inner surface of the left handle housing 151 (the surface facing the central axis of the left handle housing 151) is a second non-exposed surface that is hidden so as not to be touched by the operator's fingers. The outer surface of the left handle housing 151 (the surface facing the opposite side from the central axis of the left handle housing 151) is a second exposed surface that is exposed so as to be touched by the operator's fingers.

[0019] The left motor housing 131 has a through hole 211 , a recess 212 , a first protrusion 213 , and a first non-exposed surface 214 .

[0020] The through-hole 211 is for passing the rotation shaft 201 of the left handle housing 151. The recesses 212 are portions into which the protrusions 204 of the plate 136 fit, and are provided at the front and rear of the through-hole 211. The first protrusion 213 is a rib that protrudes leftward from the first non-exposed surface 214, i.e., toward the portion of the left handle housing 151 that covers the first non-exposed surface 214. The first protrusion 213 is provided in a portion of the left motor housing 131 that is covered by the left handle housing 151. The first protrusion 213 is located between the second protrusion 205 and the third protrusion 206 of the left handle housing 151 in the circumferential direction of the rotation shaft 201. The first protrusion 213 is configured to be movable between the second protrusion 205 and the third protrusion 206 of the left handle housing 151, as shown in FIGS. 5(A) and 5(B) described below.

[0021] The left handle housing 151 has a rotation shaft 201 , a recess 202 , a second protrusion 205 , a third protrusion 206 , and a reinforcing protrusion 207 .

[0022] The rotating shaft 201 protrudes to the right from the inner front surface of the left handle housing 151. The rotating shaft 201 passes through the plate 136 and the through-hole 211 of the left motor housing 131, and enters the inside of the rotating shaft 231 of the right motor housing 132 shown in Figure 4(A). The recesses 202 are portions into which the metal balls 135 are fitted, and are provided on both sides of the rotating shaft 201.

[0023] The second protrusion 205 and the third protrusion 206 are ribs that protrude rightward from the inner front surface of the left handle housing 151, i.e., toward the first non-exposed surface 214. The second protrusion 205 and the third protrusion 206 are provided on the inner surface (second non-exposed surface) of the left handle housing 151 at a location that covers the left motor housing 131. The second protrusion 205 and the third protrusion 206 are located radially of the rotating shaft 201 outside a detent mechanism that includes a metal ball 135 and a plate 136, which will be described later.

[0024] The reinforcing protrusion 207 protrudes rightward from the inner front surface of the left handle housing 151, extends circumferentially around the pivot shaft 201, and connects the second protrusion 205 and the third protrusion 206 to each other. The reinforcing protrusion 207 is provided to increase the strength of the second protrusion 205 and the third protrusion 206. Separate reinforcing protrusions 207 may be provided for the second protrusion 205 and the third protrusion 206. The reinforcing protrusion 207 and the first protrusion 213 of the left motor housing 131 come into contact with each other at their opposing surfaces, and the reinforcing protrusion 207 guides the first protrusion 213.

[0025] The left motor housing 131 and the left handle housing 151 are connected to each other by a detent mechanism including a metal ball 135 and a plate 136. The detent mechanism is a positioning mechanism that positions the motor housing 170 and the handle housing 180 in a straight state and a bent state.

[0026] The pair of metal balls 135 are fitted into recesses 202 in the left handle housing 151 by, for example, press-fitting. The plate 136 has through holes 203 and protrusions 204. The through holes 203 engage with the metal balls 135. Four through holes 203 are provided, two of which engage with the metal balls 135 in the straight state and two in the bent state. Each of the pair of protrusions 204 protrudes to the right and fits into a recess 212 in the left motor housing 131. This locks the plate 136 to the left motor housing 131, and prevents the plate 136 from rotating with the left handle housing 151 even when the left handle housing 151 rotates relative to the left motor housing 131.

[0027] Fig. 4(A) is an exploded perspective view of the right motor housing 132 and right handle housing 152 of the work machine 1, and the detent mechanism interposed therebetween. Fig. 4(B) is a perspective view of the right motor housing 132 and plate 156 extracted from Fig. 4(A) and viewed from a different perspective.

[0028] The right motor housing 132 and the right handle housing 152 are each a substantially semi-cylindrical body, for example, made of resin. The right motor housing 132 is the right part of the motor housing 170 shown in Figure 2. The right handle housing 152 is the right part of the handle housing 180 shown in Figure 2.

[0029] The rear part of the right surface of the right motor housing 132 is a first non-exposed surface 234 (FIG. 4(B)), which is covered by the front part of the right handle housing 152 and is therefore hidden so as not to be touched by the operator's fingers. The outer surface of the right motor housing 132 (the surface facing the opposite side from the central axis of the right motor housing 132) is a first exposed surface that is exposed so as to be touched by the operator's fingers, excluding the first non-exposed surface 234 shown in FIG. 4(B). The inner surface of the right motor housing 132 (the surface facing the central axis of the right motor housing 132) is a non-exposed surface and is hidden so as not to be touched by the operator's fingers.

[0030] The inner surface of the right handle housing 152 (the surface facing the central axis of the right handle housing 152) is a second non-exposed surface that is hidden so as not to be touched by the operator's fingers. The outer surface of the right handle housing 152 (the surface facing the opposite side from the central axis of the right handle housing 152) is a second exposed surface that is exposed so as to be touched by the operator's fingers.

[0031] The right motor housing 132 has a rotation shaft 231 , a recess 232 , a first protrusion 233 , and a first non-exposed surface 234 .

[0032] The rotating shaft 231 is cylindrical and protrudes leftward from the inner surface of the right motor housing 132. The rotating shaft 231 is coaxial with the rotating shaft 201 shown in FIG. 3(A) and has a larger diameter than the rotating shaft 201, and the rotating shaft 201 is inserted into the rotating shaft 231. The recessed portion 232 is a portion into which the protruding portion 224 of the plate 156 is fitted, and is provided in the first non-exposed surface 234. The recessed portions 232 face rightward at positions in front of and behind the rotating shaft 231. The first protrusion 233 is a rib that protrudes rightward from the first non-exposed surface 234, i.e., toward the portion of the right handle housing 152 that covers the first non-exposed surface 234. The first protrusion 233 is provided in a portion of the right motor housing 132 that is covered by the right handle housing 152. The first protrusion 233 is located between the second protrusion 225 and the third protrusion 226 of the right handle housing 152 in the circumferential direction of the rotation shaft 231. As shown in Figures 6(A) and 6(B) described below, the first protrusion 233 is configured to be movable between the second protrusion 225 and the third protrusion 226 of the right handle housing 152.

[0033] The right handle housing 152 has a bearing portion 221 , a recess 222 , a second protrusion 225 , a third protrusion 226 , and a reinforcing protrusion 227 .

[0034] Bearing portion 221 is a recess provided on the inner front surface of right handle housing 152, and is fitted with rotating shaft 201 shown in Fig. 4(A). Recesses 222 are portions into which metal balls 155 are fitted, and are provided on both sides of bearing portion 221.

[0035] The second protrusion 225 and the third protrusion 226 are ribs that protrude leftward from the inner front surface of the right handle housing 152, i.e., toward the first non-exposed surface 234. The second protrusion 225 and the third protrusion 226 are provided at a location on the inner surface (second non-exposed surface) of the right handle housing 152 that covers the right motor housing 132. The second protrusion 225 and the third protrusion 226 are located radially of the rotating shaft 231 outside a detent mechanism that includes a metal ball 155 and a plate 156, which will be described later.

[0036] The reinforcing protrusion 227 protrudes leftward from the inner front surface of the right handle housing 152, extends circumferentially around the pivot shaft 231, and connects the second protrusion 225 and the third protrusion 226 to each other. The reinforcing protrusion 227 is provided to increase the strength of the second protrusion 225 and the third protrusion 226. Separate reinforcing protrusions 227 may be provided for the second protrusion 225 and the third protrusion 226. The reinforcing protrusion 227 and the first protrusion 233 of the right motor housing 132 come into contact with each other at their opposing surfaces, and the reinforcing protrusion 227 guides the first protrusion 233.

[0037] The right motor housing 132 and the right handle housing 152 are connected to each other by a detent mechanism including a metal ball 155 and a plate 156. The detent mechanism is a positioning mechanism that positions the motor housing 170 and the handle housing 180 in a straight state and a bent state.

[0038] The pair of metal balls 155 are fitted into recesses 222 in the right handle housing 152 by, for example, press-fitting. The plate 156 has through holes 223 and protrusions 224. The through holes 223 engage with the metal balls 155. Four through holes 223 are provided, two of which engage with the metal balls 155 in the straight state and two in the bent state. Each of the pair of protrusions 224 protrudes to the left and fits into a recess 232 in the right motor housing 132. This locks the plate 156 to the right motor housing 132, and prevents the plate 156 from rotating with the right handle housing 152 even when the right handle housing 152 rotates relative to the right motor housing 132.

[0039] 5(A) and (B) are diagrams showing the straight state and the folded state, respectively, and are perspective views of the left handle housing 151 viewed from the right together with the detent mechanism and the first protrusion 213 of the left motor housing 131. In the straight state, the metal balls 135 engage with the front upper and rear lower through-holes 203 of the plate 136, and the first protrusion 213 is close to the third protrusion 206. In the folded state, the metal balls 135 engage with the rear upper and front lower through-holes 203 of the plate 136, and the first protrusion 213 is close to the second protrusion 205.

[0040] 6(A) and 6(B) are diagrams showing the straight state and the folded state, respectively, and are perspective views of the right handle housing 152 viewed from the left together with the detent mechanism and the first protrusion 233 of the right motor housing 132. In the straight state, the metal balls 155 engage with the front upper and rear lower through-holes 223 of the plate 156, and the first protrusion 233 is close to the third protrusion 226. In the folded state, the metal balls 155 engage with the rear upper and front lower through-holes 223 of the plate 156, and the first protrusion 233 is close to the second protrusion 225.

[0041] Figure 7(A) is a side view from the right of the left motor housing 131 and left handle housing 151 in the straight state, and the detent mechanism interposed therebetween. Figure 7(B) is a side view of the handle housing 180 in the rotation limit state, where the handle housing 180 has been further rotated in the direction opposite to the bending direction from the state of Figure 7(A). In Figures 7(A) and (B), the first protrusion 213 and the third protrusion 206 are shown in cross section around the first protrusion 213 and the third protrusion 206 so that the first protrusion 213 and the third protrusion 206 are visible.

[0042] In the straight state shown in FIG. 7(A), the first protrusion 213 is close to the third protrusion 206 but does not come into contact with the third protrusion 206. In the rotation limit state shown in FIG. 7(B), the first protrusion 213 comes into contact with the third protrusion 206. This is done in consideration of dimensional tolerances during manufacturing, etc., to ensure that the detent mechanism holds the protrusion when the protrusion is changed from the bent state to the straight state, that is, to prevent the first protrusion 213 from coming into contact with the third protrusion 206 before the detent mechanism holds the protrusion. As another example, the first protrusion 213 may come into contact with the third protrusion 206 in the straight state shown in FIG. 7(A).

[0043] Figure 7(C) is a side view of the handle housing 180 in a folded state after it has been rotated in the folding direction from the state of Figure 7(A). Figure 7(D) is a side view of the handle housing 180 in a rotation limit state after it has been further rotated in the folding direction from the state of Figure 7(C). In Figures 7(C) and (D), the peripheries of the first protrusion 213 and the second protrusion 205 are cross-sectionally shown so that the first protrusion 213 and the second protrusion 205 appear.

[0044] In the bent state shown in Fig. 7(C), the first protrusion 213 is close to the second protrusion 205 but does not abut against the second protrusion 205. In the rotation limit state shown in Fig. 7(D), the first protrusion 213 abuts against the second protrusion 205. This is done in consideration of dimensional tolerances during manufacturing, etc., to ensure that the detent mechanism holds the protrusion when changing from a straight state to a bent state, that is, to prevent the first protrusion 213 from abutting against the second protrusion 205 before the detent mechanism holds the protrusion. As another example, the first protrusion 213 may abut against the second protrusion 205 in the bent state shown in Fig. 7(C).

[0045] As shown in Figure 7(D), when the first protrusion 213 and the second protrusion 205 are in contact with each other, the outer surfaces of the left motor housing 131 and the left handle housing 151 do not come into contact with each other. Specifically, in the rotation limit state shown in Figure 7(D), a gap 208 exists at the corner formed by the left motor housing 131 and the left handle housing 151 (the corner with an angle smaller than 180 degrees).

[0046] Figure 8(A) is a side view from the left of the right motor housing 132 and the right handle housing 152 in the straight state, and the detent mechanism interposed therebetween. Figure 8(B) is a side view of the handle housing 180 in the rotation limit state, where the handle housing 180 has been further rotated in the direction opposite to the bending direction from the state of Figure 8(A). In Figures 8(A) and (B), the first protrusion 233 and the third protrusion 226 are shown in cross section around the first protrusion 233 and the third protrusion 226 so that the first protrusion 233 and the third protrusion 226 are visible.

[0047] In the straight state shown in FIG. 8(A), the first protrusion 233 is close to the third protrusion 226 but does not abut against the third protrusion 226. In the rotation limit state shown in FIG. 8(B), the first protrusion 233 abuts against the third protrusion 226. This is done in consideration of dimensional tolerances during manufacturing, etc., to ensure that the detent mechanism holds the bent state when the bent state is changed to the straight state, that is, to prevent the first protrusion 233 from abutting against the third protrusion 226 before the detent mechanism holds the bent state. As another example, the first protrusion 233 may abut against the third protrusion 226 in the straight state shown in FIG. 8(A).

[0048] Figure 8(C) is a side view of a folded state in which handle housing 180 has been rotated in the bending direction from the state of Figure 8(A). Figure 8(D) is a side view of a rotation limit state in which handle housing 180 has been further rotated in the bending direction from the state of Figure 8(C). In Figures 8(C) and (D), the peripheries of first protrusion 233 and second protrusion 225 are cross-sectionally shown so that first protrusion 233 and second protrusion 225 appear.

[0049] In the bent state shown in FIG. 8(C), the first protrusion 233 is close to the second protrusion 225 but does not abut against the second protrusion 225. In the rotation limit state shown in FIG. 8(D), the first protrusion 233 abuts against the second protrusion 225. This is done in consideration of dimensional tolerances during manufacturing, etc., to ensure that the detent mechanism holds the protrusion when changing from a straight state to a bent state, that is, to prevent the first protrusion 233 from abutting against the second protrusion 225 before the detent mechanism holds the protrusion. As another example, the first protrusion 233 may abut against the second protrusion 225 in the bent state shown in FIG. 8(C).

[0050] As shown in Figure 8(D), when the first protrusion 233 and the second protrusion 225 are in contact with each other, the outer surfaces of the right motor housing 132 and the right handle housing 152 do not come into contact with each other. Specifically, in the rotation limit state shown in Figure 8(D), a gap 228 exists at the corner formed by the right motor housing 132 and the right handle housing 152 (the corner with an angle smaller than 180 degrees).

[0051] This embodiment has the following advantages.

[0052] (1) The motor housing 170 (left motor housing 131, right motor housing 132) has first protrusions 213, 233 on first non-exposed surfaces 214, 234. The handle housing 180 (left handle housing 151, right handle housing 152) has second protrusions 205, 225 on its inner surface (second non-exposed surface). The first protrusions 213, 233 and the second protrusions 205, 225 are configured to abut against each other in the folded state, or to abut against each other when the handle housing 180 is further rotated in the folding direction from the folded state. When the first protrusions 213, 233 and the second protrusions 205, 225 abut against each other, the exposed surfaces of the motor housing 170 and the handle housing 180 do not abut against each other (gaps 208, 228 exist at the corners of the motor housing 170 and the handle housing 180 that are smaller than 180 degrees). This prevents a user's finger from getting pinched between the exposed portions of the motor housing 170 and the handle housing 180, resulting in a poor user experience. Specifically, it becomes difficult for a user's finger to get pinched between the exposed portions of the motor housing 170 and the handle housing 180, and even if a user's finger does get pinched, the force of the pinching is weak, thereby reducing pain. Note that the first protrusions 213, 233 and the second protrusions 205, 225 are located in positions that are out of reach of the user's fingers, and therefore, in normal use, the user's fingers will not get pinched between the first protrusions 213, 233 and the second protrusions 205, 225.

[0053] (2) The second protrusions 205, 225 and the third protrusions 206, 226 are provided in a position radially outward of the positioning mechanism (detent mechanism including plates 136, 156, etc.) that positions the motor housing 170 and the handle housing 180 in a straight state and a bent state in the rotating shaft 201. Therefore, compared to when the second protrusions 205, 225 and the third protrusions 206, 226 are provided in a position radially inward of the positioning mechanism in the rotating shaft 201, the load on the mutual contact portions between the first protrusions 213, 233 and the second protrusions 205, 225 and the third protrusions 206, 226 is reduced when an impact occurs due to, for example, the work machine 1 being dropped, and excessive deformation and damage to the first protrusions 213, 233, the second protrusions 205, 225, and the third protrusions 206, 226 is suppressed.

[0054] (3) The reinforcing protrusions 207, 227 reinforce the second protrusions 205, 225 and the third protrusions 206, 226, thereby preventing excessive deformation or damage to the second protrusions 205, 225 and the third protrusions 206, 226 when an impact occurs, such as when the work machine 1 is dropped.

[0055] (4) The motor housing 170 (left motor housing 131, right motor housing 132) has third protrusions 206, 226 on the first non-exposed surfaces 214, 234. The first protrusions 213, 233 and the third protrusions 206, 226 are configured to abut against each other in the straight state, or to abut against each other when the handle housing 180 is further rotated from the straight state in the direction opposite to the bending direction. This prevents fingers from getting pinched between the exposed portions of the motor housing 170 and the handle housing 180, resulting in a poor user experience. The first protrusions 213, 233 and the third protrusions 206, 226 are located in positions that are out of reach of the operator's fingers, so fingers will not get pinched between the first protrusions 213, 233 and the third protrusions 206, 226 in normal use.

[0056] Although the present invention has been described above using the embodiments as examples, the present invention is not limited to the embodiments. Various modifications can be made to the details specifically described in the embodiments within the scope of the claims.

[0057] The detent mechanism may be provided only at the connecting portion between the left motor housing 131 and the left handle housing 151 or the connecting portion between the right motor housing 132 and the right handle housing 152. The third protrusions 206, 226 may be omitted, and the exposed portions of the motor housing 170 and the handle housing 180 may come into contact when the handle housing 180 is further rotated from the straight state in the direction opposite to the bending direction. The work implement of the present invention is not limited to a driver drill and may be of another type, such as an impact driver. Furthermore, the work implement of the present invention is not limited to a cordless type and may be a corded type that is powered by power supplied from an external AC power source via a power cord. [Explanation of symbols]

[0058] 105...Clutch dial, 110...Gear case, 129...Motor, 131...Left motor housing, 132...Right motor housing, 135...Metal ball, 136...Plate, 137...Shift knob, 141...Drive operation unit, 147...Battery, 151...Left handle housing, 152...Right handle housing, 170...Motor housing, 180...Handle housing, 201...Pivot shaft, 202...Recess, 203... Through hole, 204...protrusion, 205...second protrusion, 206...third protrusion, 207...reinforcing protrusion, 208...gap, 211...through hole, 212...recess, 213...first protrusion, 214...first non-exposed surface, 221...bearing portion, 222...recess, 223...through hole, 224...protrusion, 225...second protrusion, 226...third protrusion, 227...reinforcing protrusion, 228...gap, 231...rotating shaft, 232...recess, 233...first protrusion, 234...first non-exposed surface.

Claims

1. a motor housing that houses a motor, the motor housing having a first exposed surface that is exposed so that the operator's fingers can touch it, and a first unexposed surface that is hidden so that the operator's fingers cannot touch it; a handle housing rotatably connected to the motor housing around a rotation axis, the handle housing having a second exposed surface that is exposed so as to be touched by an operator's fingers and a second unexposed surface that is hidden so as not to be touched by an operator's fingers, the handle housing being rotatable between a straight state in which the handle housing extends in substantially the same direction as the motor housing and a bent state in which the handle housing rotates from the straight state in a bending direction and extends in a direction intersecting the motor housing; A work machine having the motor housing has a first protrusion on the first unexposed surface; the handle housing has a second protrusion on the second unexposed surface; the first protrusion and the second protrusion are configured to abut against each other in the folded state, or to abut against each other when the handle housing is further rotated in the folding direction from the folded state, The first exposed surface of the motor housing and the second exposed surface of the handle housing are configured not to come into contact with each other when the first protrusion and the second protrusion are in contact with each other. A work machine characterized by:

2. The work machine according to claim 1, the handle housing is configured to cover at least a portion of the first unexposed surface of the motor housing; the first protrusion is provided at a portion of the motor housing that is covered by the handle housing, The second protrusion is provided at a portion of the handle housing that covers the motor housing. A work machine characterized by:

3. The work machine according to claim 2, the first protrusion protrudes from the first non-exposed surface of the motor housing toward the second non-exposed surface, and / or the second protrusion protrudes from the second non-exposed surface of the handle housing toward the first non-exposed surface. A work machine characterized by:

4. The work machine according to claim 1, the handle housing has a third protrusion on the second unexposed surface; the third protrusion is configured to abut against the first protrusion in the straight state, or to abut against the first protrusion when the handle housing is further rotated from the straight state in a direction opposite to the bending direction. A work machine characterized by:

5. The work machine according to claim 4, The first protrusion is configured to be movable between the second protrusion and the third protrusion. A work machine characterized by:

6. The work machine according to claim 1, a positioning mechanism for positioning the motor housing and the handle housing in the straight state and the bent state; The second protrusion is provided at a position outer than the positioning mechanism in a radial direction of the rotation shaft. A work machine characterized by:

7. The work machine according to claim 1, The handle housing has a first reinforcing protrusion extending from the second protrusion in the circumferential direction of the rotation shaft. A work machine characterized by:

8. The work machine according to claim 4, The handle housing has a second reinforcing protrusion extending from the third protrusion in the circumferential direction of the rotation shaft. A work machine characterized by:

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