Power Tools

Abstract

To perform positioning of a side handle with high reliability.SOLUTION: In a grinder 1, a side handle 20 is attached to a side surface of a gear housing 3. The side handle 20 is attached to the gear housing 3 in a manner that its angle relative to the gear housing 3 can be adjusted by operation parts 45, 45 provided at two positions, i.e., left and right positions, in the side handle 20. The structure enables angle adjustment of the side handle 20 to be performed without using tools and makes the angle less likely to be changed unexpectedly after the angle adjustment.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] TECHNICAL FIELD This disclosure relates to power tools such as polishers and grinders. [Background technology]

[0002] Power tools such as polishers and grinders are provided with side handles for gripping by an operator. The side handles are attached to the side surfaces of the tool body. For example, Patent Document 1 discloses an electric tool in which both ends of a loop-shaped side handle are rotatably attached to the left and right sides of the tool body by screws. The side handle is provided with a lock knob that can be rotated between a position where the end of the side handle is locked to the tool body by a rotation operation and a position where the lock is released. When the lock knob is rotated to the release position, the angle of the side handle can be adjusted, and when the lock knob is rotated to the lock position, the side handle can be fixed at the adjusted angle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2001 / 19228 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional side handles described above allow the angle to be adjusted (positioned) without using tools such as a screwdriver. However, because the lock knob is provided in only one location, there is a risk that the angle may change accidentally if an external force is applied to the side handle.

[0005] SUMMARY OF THE DISCLOSURE In view of the above, an object of the present disclosure is to provide a power tool that allows the positioning of a side handle to be performed with high reliability. [Means for solving the problem]

[0006] In order to achieve the above object, the present disclosure provides a power tool having a side handle attached to a side surface of a tool body, The side handle is On both sides The side handle is attached so as to be positionable relative to the tool body by an operating portion provided on the side handle. Along with, Each of the operating parts includes an operating member that is movable between a first position for positioning the side handle relative to the tool body and a second position for releasing the positioning; and biasing means for biasing the operating member to the first position, The side handle has arms at both ends that are rotatably provided with respect to both sides of the tool body, and an engagement portion that engages with each other in a rotational direction is provided between each of the arms and the tool body, and the operation portion is provided on each of the arms, Each of the operating members, in the first position, restricts the bending of the arm and maintains the engagement between the engaging portion on the arm side and the engaging portion on the tool body side to position the side handle in a rotational direction, and in the second position, allows the arm to bend and releases the engagement between the engaging portion on the arm side and the engaging portion on the tool body side to allow the side handle to rotate. It is characterized by: In order to achieve the above object, another configuration of the present disclosure is a power tool having a side handle attached to a side surface of a tool body, The side handle has a pair of cylindrical parts with an axis in the left-right direction at both ends of the tool body, and is attached so as to be positionable with respect to the tool body by an operating part provided on each of the cylindrical parts. Each of the operation units includes: Provided in the cylindrical portion, The tool body has an engagement position where it engages with an engaged portion provided on the tool body and a non-engagement position where it does not engage with the engaged portion. Left and right A movable engagement member; Provided in the cylindrical portion a biasing means for biasing the engaging member to the engaging position; protruding into the cylindrical portion an operating member having an eccentric pin that engages with the engaging member, The engaging members can be moved to the non-engaging position via the eccentric pin by rotating the operating members. the law of nature, Each of the engagement members is provided with a rotation restriction member that engages with the inner surface of the cylindrical portion to integrate the engagement member with the cylindrical portion in the rotation direction of the side handle. It is characterized by: Effect of the Invention

[0007] According to the present disclosure, the positioning of the side handle can be performed with high reliability. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a grinder according to a first embodiment. [Diagram 2] FIG. 2 is a side view of the grinder of the first embodiment. [Diagram 3] FIG. 1 is a front view of a grinder according to a first embodiment. [Figure 4] FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 2. [Diagram 5] FIG. 2 is an exploded perspective view of the operation unit as viewed from the right side. [Figure 6] FIG. 2 is an exploded perspective view of the operation unit as viewed from the left side. [Figure 7] FIG. 11 is a partial perspective view of a grinder according to a second embodiment. [Figure 8] FIG. 11 is a partial side view of the grinder of the second embodiment. [Figure 9] FIG. 11 is a partial front view of the grinder of the second embodiment. [Figure 10] FIG. 10 is an enlarged cross-sectional view taken along line BB in FIG. [Figure 11] FIG. 2 is an exploded perspective view of the operation unit as viewed from the left side. [Figure 12] FIG. 2 is an exploded perspective view of the operation unit as viewed from the right side. [Figure 13] BB is an enlarged cross-sectional view of the state in which the operation knob is rotated to release the lock. FIG. [Figure 14] FIG. 11 is a partial perspective view of the grinder of the third embodiment. [Figure 15] FIG. 11 is a partial side view of the grinder of the third embodiment. [Figure 16] FIG. 11 is a partial front view of the grinder of the third embodiment. [Figure 17] FIG. 2 is an exploded perspective view of the operation unit as viewed from the right side. [Figure 18] FIG. 2 is an exploded perspective view of the operation unit as viewed from the left side. [Figure 19] 16 is an enlarged cross-sectional view taken along line CC in FIG. 15. [Figure 20] 13 is an enlarged cross-sectional view of the operation plate when it is rotated to release the lock, taken along line CC. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In an embodiment of the present disclosure, the operation portion may be provided at two locations, left and right, across the tool body. According to this configuration, the positioning of the loop-shaped side handle can be performed with good operability. In one embodiment of the present disclosure, each operating portion may include an operating member movable between a first position for positioning the side handle relative to the tool body and a second position for releasing the positioning, and a biasing means for biasing the operating member to the first position. With this configuration, after the operating member is moved to the second position to position the side handle, by releasing the operating member, the operating member is automatically returned to the first position by the biasing means, and rotation of the side handle is locked. Therefore, even with two operating members, operability is good. In one embodiment of the present disclosure, the side handle may have arms provided at both ends rotatably relative to both sides of the tool body, engaging portions that engage with each other in the rotational direction are provided between each arm and the tool body, and an operating portion may be provided on each arm. In addition, each operating member may, in a first position, restrict bending of the arm to maintain the engagement between the engaging portion on the arm side and the engaging portion on the tool body side to position the side handle in the rotational direction, and in a second position, allow bending of the arm to release the engagement between the engaging portion on the arm side and the engaging portion on the tool body side to allow rotation of the side handle. With this configuration, the positioning of the side handle can be easily performed by utilizing the bending of the arm portion. In one embodiment of the present disclosure, mounting members that rotatably support each arm of the side handle are provided on the left and right sides of the tool body, and each operating member may engage with the mounting member in a first position to restrict bending of the arm, and release the engagement with the mounting member in a second position to allow bending of the arm. According to this configuration, it is possible to switch between locking and unlocking the rotation of the side handle by simply moving the operating member. In one embodiment of the present disclosure, one of the engaging portion on the arm portion side and the engaging portion on the tool body side may be provided with a pressing means for pressing the other engaging portion. This configuration reduces rattling of the side handle when in the positioned state.

[0010] In one embodiment of the present disclosure, each operating portion includes an engaging member that is movable between an engaging position in which it engages with an engaged portion provided on the tool body and a non-engaged position in which it does not engage with the engaged portion, a biasing means for biasing the engaging member to the engaged position, and an operating member having an eccentric pin that engages with the engaging member, and each engaging member may be movable to the non-engaged position via the eccentric pin by rotating each operating member. According to this configuration, the positioning of the side handle can be released by a simple rotation operation of the operating member. In one embodiment of the present disclosure, each engagement member may be provided with a rotation restriction member that engages with an end of the side handle to become one with it in the rotation direction. According to this configuration, the engaging member and the side handle can be easily integrated in the rotational direction. In one embodiment of the present disclosure, each operating portion may include an engaging member movable between an engaging position where it engages with an engaged portion provided on the tool body and a non-engaged position where it does not engage with the engaged portion, a biasing means for biasing the engaging member to the non-engaged position, and an operating member that abuts against the engaging member at the non-engaged position. Cams may be formed on the abutment surfaces of the engaging member and the operating member that can be switched between an engaging position where they engage with each other in the rotational direction and a non-engaging position where they do not engage with each other in the rotational direction and their end faces abut against each other, and the engaging member may be moved to the engaging position at the non-engaging position by rotating the operating member, and the engaging member may be moved to the non-engaging position at the engaging position. According to this configuration, the side handle can be positioned by a simple rotation operation of the operating member. In one embodiment of the present disclosure, the side handle may be attachable to the tool body in a reversible left-right orientation. According to this configuration, the side handle can be installed without worrying about its orientation, making installation easier. EXAMPLES

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 is a perspective view showing a grinder as an example of a power tool, Fig. 2 is a side view of the grinder, and Fig. 3 is a front view of the grinder. The grinder 1 has a main housing 2 that houses a motor (not shown) and extends in the front-rear direction. A gear housing 3 with a spindle 4 protruding downward is attached to the front side of the main housing 2. A disk-shaped tool tip (e.g., a grindstone) 5 is attached perpendicularly to the lower end of the spindle 4. A small-diameter grip section 6 is formed at the rear of the main housing 2. A battery pack 7, which serves as a power source, is attached to the rear end of the grip section 6. As shown in Figures 4 and 5, mounting portions 10, 10 for a side handle 20 are protrudingly provided on the left and right side surfaces of the gear housing 3. Each mounting portion 10 is cylindrical in a circular side view, and has inner cam surfaces 11, 11 formed on its outer end surface. The inner cam surface 11 has a plurality of mountain-shaped cam teeth 12, 12... extending in the radial direction and spaced equally in the circumferential direction. A bottomed receiving hole 13 is formed in the center of each mounting portion 10. A screw hole 14 is formed coaxially in the center of the receiving hole 13.

[0012] A connecting bolt 15 is fixed to each mounting portion 10. Each connecting bolt 15 has a large diameter portion 16 in the middle of the shaft, and the inside of the large diameter portion 16 (the mounting portion 10 side) forms a threaded portion 17. The large diameter portion 16 has a diameter that fits into the receiving hole 13 of the mounting portion 10. The axial length of the large diameter portion 16 is greater than the axial depth of the receiving hole 13. A head portion 18 is provided on the outside of the connecting bolt 15 (the side opposite the mounting portion 10). The head portion 18 is formed with a two-face width portion 19. When the connecting bolt 15 is gripped by the two flats portion 19 with a tool or the like, the threaded portion 17 can be screwed into the threaded hole 14 of the mounting portion 10. Then, the large diameter portion 16 is fixed in a position where it abuts against the bottom of the receiving hole 13. In this state, the left and right outer halves of the large diameter portion 16 and the head 18 protrude outward from the inner cam surface 11 to the left and right.

[0013] The side handle 20 is formed in an inverted U-shape when viewed from the front. The side handle 20 includes a handle portion 21 that has a circular cross section extending in the left-right direction, and a pair of arms 22, 22 that extend downward from both the left and right ends of the handle portion 21. The lower portions of the arms 22, 22 are attached to the attachment portions 10, 10. The attachment structure of the arm portion 22 will be described below, but since the left-right structure is symmetrical, the right arm portion 22 will be mainly described. As shown in FIG. 6, a thin-walled portion 23, which is thinner in the left-right direction than the upper portion, is formed on the lower portion of the arm portion 22 toward the left. A cylindrical portion 24, which is circular in side view and protrudes to the left, is formed on the lower end of the left side surface of the thin-walled portion 23. An outer cam surface 25 is formed on the left end surface of the cylindrical portion 24. The outer cam surface 25 has a plurality of mountain-shaped cam teeth 26, 26... extending in the radial direction, at equal intervals in the circumferential direction, similar to the inner cam surface 11. The center of the cylindrical portion 24 is a through hole 27 having approximately the same diameter as the receiving hole 13. The connecting bolt 15 is passed through the through hole 27 from the head 18, and the outer cam surface 25 and the inner cam surface 11 are in contact with each other, so that the cam teeth 12, 26 engage with each other in the rotational direction.

[0014] An inner recess 28 that extends in the vertical direction and has a flat bottom surface is formed in the center of the right side surface of the thin-walled portion 23 in the front-rear direction. A through hole 27 opens in the inner recess 28. An inner semicircular groove 29 that has a semicircular cross section and extends in the vertical direction and communicates with the upper side of the through hole 27 is formed in the center of the inner recess 28 in the front-rear direction. A notch 30 that communicates with the upper end of the inner semicircular groove 29 is formed in the center of the right side surface of the arm portion 22 in the front-rear direction. Square holes 31, 31 that extend in the vertical direction on the upper side of the tube portion 24 are formed in the left-right direction in the thin-walled portion 23 in front of and behind the inner recess 28. A pair of retaining holes 32, 32 are formed in the left-right direction in the thin-walled portion 23 in front of and behind the through hole 27. A coil spring 33 is accommodated in the retaining hole 32 on the right side and a ball 34 is accommodated in the retaining hole 32 on the left side.

[0015] A retaining lid 35 is attached to the right side surface of the thin-walled portion 23. The retaining lid 35 has the same shape as the thin-walled portion 23 in a side view, and an engagement piece 36 that engages with the notch 30 is formed at the upper end. A pair of front and rear locking claws 37, 37 are formed on the left side surface of the retaining lid 35 below the engagement piece 36. The locking claws 37, 37 extend in the vertical direction and pass through the rectangular holes 31, 31 of the thin-walled portion 23. A barb 38 that engages with the left side surface of the thin-walled portion 23 is formed at the left end of each locking claw 37. An outer recess 39 extending in the vertical direction is formed on the left side surface of the retaining cover 35 between the locking claws 37, 37. The outer recess 39 faces the inner recess 28 of the thin-walled portion 23. An outer semicircular groove 40 having a semicircular shape including the engagement piece 36 and extending in the vertical direction is formed in the outer recess 39. The outer semicircular groove 40 faces the inner semicircular groove 29 of the thin-walled portion 23. A bottomed hole 41 is formed at the lower end of the outer semicircular groove 40. The bottomed hole 41 is coaxial with the connecting bolt 15 and is capable of receiving the head 18 therein. The retaining lid 35 is attached to the thin-walled portion 23 by aligning the engagement pieces 36 with the notches 30 and passing the locking claws 37, 37 through the rectangular holes 31, 31. In this state, the inner recess 28 and the outer recess 39 face each other between the thin-walled portion 23 and the retaining lid 35, and the inner semicircular groove 29 and the outer semicircular groove 40 face each other to form an accommodation space 42 in the vertical direction that opens to the bottom. The right ends of the coil springs 33, 33 abut against the left side surface of the retaining lid 35 to press the left balls 34, 34 against the inner cam surface 11.

[0016] An operating portion 45 is provided at the lower end of the arm portion 22. The operating portion 45 enables the arm portion 22 to be locked in rotation with respect to the attachment portion 10 and released from the locked state. The operation portion 45 includes an operation plate 46 and a coil spring 47 . The operation plate 46 is a strip that fits across the inner recess 28 and the outer recess 39. An escape hole 48 into which the head 18 of the connecting bolt 15 is loosely inserted is formed in the middle of the operation plate 46. A lock hole 49 having a smaller diameter than the escape hole 48 is formed above the escape hole 48 and communicates with it. The lock hole 49 has a larger diameter than the shaft of the connecting bolt 15 and a smaller diameter than the head 18. The operation plate 46 is slidable between an upper slide position where the relief hole 48 is positioned coaxially with the connecting bolt 15, and a lower slide position where the lock hole 49 is positioned coaxially with the connecting bolt 15. In the upper slide position, the relief hole 48 does not interfere with the head 18 of the connecting bolt 15, so bending to the right together with the thin-walled portion 23 is permitted. In the lower slide position, the lock hole 49 interferes with the head 18, so bending to the right together with the thin-walled portion 23 is restricted. An engagement projection 50 is provided on the upper end of the operation plate 46. The lower end of the operation plate 46 protrudes downward from the accommodation space 42. An operation piece 51 that is bent to the right is formed on the lower end.

[0017] The coil spring 47 is disposed in the vertical direction on the upper side of the operation plate 46, straddling the inner semicircular groove 29 and the outer semicircular groove 40. The upper end of the coil spring 47 abuts against the upper surface of the notch 30. The lower end of the coil spring 47 is engaged with the engaging projection 50 of the operation plate 46. Therefore, the operation plate 46 is normally biased by the coil spring 47 to the lower slide position.

[0018] In the grinder 1 configured as described above, when the operation plates 46, 46 of the left and right operation parts 45, 45 are in the lower slide position, if a force in the rotational direction is applied to the side handle 20, the cam teeth 26 of the outer cam surface 25 of each arm 22 interfere with the cam teeth 12 of the inner cam surface 11, and the thin-walled portion 23 tends to bend outward to the left and right. However, since the operation plate 46, which is in the lower slide position and moves in the left and right direction together with the thin-walled portion 23, abuts against the head 18 of the connecting bolt 15, the movement of the operation plate 46 and the thin-walled portion 23 to the left and right is restricted. Thus, the rotation of the side handle 20 is locked. At this time, the coil springs 33, 33 of each arm 22 press the balls 34, 34 against the inner cam surface 11, so that rattling of the arm 22 in the rotation locked state is suppressed.

[0019] On the other hand, when adjusting the angle of the side handle 20, the operation pieces 51, 51 of the operation plates 46, 46 in the left and right operation parts 45, 45 are pushed upward at the same time. Then, the operation plates 46, 46 slide to the upper slide position as shown by the two-dot chain line in Fig. 4. As a result, the relief holes 48, 48 of the operation plates 46, 46 move coaxially with the heads 18, 18. Therefore, the restriction on the movement of the operation plates 46, 46 and the thin-walled parts 23, 23 outward to the left and right is released. When the side handle 20 is rotated in this state, the cam teeth 12 of the inner cam surfaces 11, 11 interfere with the cam teeth 26 of the outer cam surfaces 25, 25. Due to this interference, the thin-walled portions 23, 23 are bent outward to the left and right together with the operation plate 46 and the retaining cover 35, as shown by the two-dot chain line in FIG. 4. This allows the cam teeth 26 of the outer cam surfaces 25, 25 to overcome the cam teeth 12 of the inner cam surfaces 11, 11. Therefore, as shown by the two-dot chain line in FIG. 2, the side handle 20 can be rotated to any angle. When the angle is determined and the operation pieces 51, 51 are released from being pressed, the operation plates 46, 46 return to the lower sliding position, and the rotation of the side handle 20 is locked again. However, even if the operation piece 51 of either the left or right operation plate 46 is pressed in to release the restriction on the movement of the thin-walled portion 23, the movement of the other thin-walled portion 23 remains restricted, so the rotation lock of the side handle 20 is maintained.

[0020] In this manner, in the grinder 1 of the above-mentioned first embodiment, the side handle 20 is attached so as to be angle adjustable (positionable) with respect to the gear housing 3 (tool body) by the two operating portions 45, 45 provided on the side handle 20. This configuration allows the angle of the side handle 20 to be easily adjusted without tools, and reduces the risk of the angle changing unexpectedly after the angle adjustment. Therefore, the angle adjustment of the side handle 20 can be performed with high reliability. In particular, since the operating portions 45, 45 are provided at two locations, one on the left and one on the right side of the gear housing 3, the angle of the loop-shaped side handle 20 can be adjusted with good operability.

[0021] Each operating unit 45 includes an operating plate 46 (operating member) that can move between a lower slide position (first position) that locks the rotation of the side handle 20 relative to the gear housing 3 and an upper slide position (second position) that releases the rotation lock, and a coil spring 47 (biasing means) that biases the operating plate 46 to the lower slide position. Therefore, after moving the operation plates 46, 46 to the upper slide position to adjust the angle of the side handle 20, by releasing the pressure on the operation plates 46, 46, the operation plates 46, 46 automatically return to the lower slide position by the coil springs 47, 47, locking the rotation of the side handle 20. Therefore, even with two operation plates 46, 46, operability is good.

[0022] The side handle 20 has arms 22, 22 provided at both ends rotatably provided on both sides of the gear housing 3, and an inner cam surface 11 and an outer cam surface 25 (engagement portion) that engage with each other in the rotational direction are provided between each arm 22 and the gear housing 3. An operation portion 45 is provided on each arm 22, and each operation plate 46, in the lower slide position, restricts the bending of the arm 22 to maintain the engagement between the outer cam surface 25 on the arm 22 side and the inner cam surface 11 on the gear housing 3 side, thereby locking the rotation of the side handle 20. On the other hand, in the upper slide position, each operation plate 46 allows the arm 22 to bend and releases the engagement between the outer cam surface 25 on the arm 22 side and the inner cam surface 11 on the gear housing 3 side, thereby allowing the rotation of the side handle 20. Therefore, the angle of the side handle 20 can be easily adjusted by utilizing the bending of the arms 22, 22.

[0023] Connecting bolts 15 (mounting members) that rotatably support each arm 22 of the side handle 20 are provided on the left and right sides of the gear housing 3, and each operating plate 46 engages with the connecting bolt 15 in the lower slide position to restrict bending of the arm 22, and in the upper slide position, the engagement with the connecting bolt 15 is released to allow bending of the arm 22. Therefore, by simply moving the operation plate 46 up and down, it is possible to switch between locking and unlocking the rotation of the side handle 20. A coil spring 33 and a ball 34 (pressing means) for pressing the inner cam surface 11 are provided on the outer cam surface 25 on the arm portion 22 side. Therefore, rattling of the side handle 20 in the rotation locked state is suppressed.

[0024] In the first embodiment, the sliding direction of the operation plate is not limited to the up-down direction along the arm. The operation plate can be slid in a forward-backward direction or a diagonal direction intersecting with the arm to lock and unlock the rotation of the side handle. The operation plate is not limited to a structure in which it is slid linearly to switch between the first and second positions. For example, the operation plate may be provided within the arm so as to be swingable back and forth around a fulcrum provided at the upper end, and may be configured to switch between one of the forward and backward swing positions (first position) where the lock hole is located coaxially with the head of the connecting bolt, and the other forward and backward swing position (second position) where the relief hole is located coaxially with the head. Therefore, a torsion spring, a leaf spring, or the like may also be used as the biasing means. The thin portion may be separate from the arm portion of the side handle. The retaining cover may be integrally attached to the arm by means of a thin hinge or the like. The mounting member is not limited to a connecting bolt, and may be a pin or other member. EXAMPLES

[0025] Next, another embodiment of the present disclosure will be described, in which the same components as those in the first embodiment are denoted by the same reference numerals and overlapping descriptions will be omitted. Fig. 7 is a partial perspective view showing an upper portion of the gear housing to which the side handle is attached, Fig. 8 is a partial side view, and Fig. 9 is a partial front view. In this grinder 1A as well, mounting portions 10A, 10A are provided on the left and right side surfaces of the gear housing 3, as shown in Figures 10 and 11. The mounting portion 10A is a circular recess in side view, and has a screw hole 55 formed in the center. A plurality of engagement grooves 56, 56... are formed around the screw hole 55, extending in the radial direction with the screw hole 55 as the center, at equal intervals in the circumferential direction of the mounting portion 10A. The side handle 20A is in the form of a loop that wraps around the upper side of the gear housing 3, and at both ends, a pair of cylindrical parts 57, 57 are provided that are coaxial with the mounting parts 10A, 10A. However, the side handle 20A is not symmetrical. The left end 58 is connected upward from the upper surface of the cylindrical part 57, and the right end 59 extends to the right from the lower surface of the cylindrical part 57, and then curves upward through the right outer side of the cylindrical part 57. Thus, the side handle 20A is asymmetrical. The right end 59 is provided with a through hole 60 that penetrates coaxially with the axis of the cylindrical part 57. The through hole 60 is for operating a hexagon socket bolt 83, which will be described later.

[0026] Operating parts 45A are provided on the cylindrical parts 57. As shown in Fig. 10, 11 and 12, the operating part 45A includes a connecting bolt 61, an engagement plate 62, a coil spring 63 and an operating knob 75. Since the operating part 45A is symmetrical, the left operating part 45A will be mainly described below. The connecting bolt 61 has a threaded portion 64 at the right end of the shaft and a circular plate-shaped head 65 at the left end. A screw hole 66 is formed in the center of the head 65, and a pair of small holes 67, 67 for screwing are formed concentrically about the screw hole 66. The connecting bolt 61 is screwed into the screw hole 55 of the mounting part 10A inside the cylindrical portion 57. A circular hole 68, which is smaller in diameter than the opening on the right side, is formed on the left side of the tubular portion 57 and into which the head 65 of the connecting bolt 61 fits. A circular fitting hole 69 is formed on the front side of the tubular portion 57. Three guide grooves 70, 70... are cut linearly from the right end to the left on the inner circumferential surface of the tubular portion 57, at the top, bottom, and rear.

[0027] The engagement plate 62 is penetrated by the connecting bolt 61 inside the tubular portion 57. A circular flange portion 71 that slides against the inner peripheral surface of the tubular portion 57 is formed at the left end of the engagement plate 62. Three pins 72, 72... that protrude upward, downward, and backward are provided on the peripheral surface of the engagement plate 62 on the right side of the flange portion 71. Each pin 72 is engaged with a guide groove 70 provided in the tubular portion 57. Thus, the engagement plate 62 can move left and right along the connecting bolt 61 while its rotation is restricted inside the tubular portion 57. A plurality of engagement teeth 73, 73... extending radially are formed on the right side surface of the engagement plate 62 at equal intervals in the circumferential direction. The engagement teeth 73 have a mountain-shaped cross section in the circumferential direction, and are the same in number and arrangement as the engagement grooves 56 of the mounting portion 10A. The coil spring 63 penetrates the shaft portion of the connecting bolt 61 between the head 65 of the connecting bolt 61 and the engagement plate 62. Therefore, the engagement plate 62 is biased by the coil spring 63 to a rightward sliding position where the engagement teeth 73 engage with the engagement grooves 56.

[0028] The operation knob 75 is rotatably fitted into the fitting hole 69 of the cylindrical portion 57. The operation knob 75 is circular in a front view, and an eccentric pin 76 that protrudes rearward at an eccentric position is provided on the rear surface. The tip of the eccentric pin 76 is located on the right side of the flange portion 71 of the engagement plate 62. A knob 77 is provided on the front surface of the operation knob 75. The knob 77 is an L-shaped plate that extends forward from the front surface of the operation knob 75 and then protrudes on the eccentric side opposite the eccentric pin 76. A stopper plate 78 is fixed to the head 65 of the connecting bolt 61 on the left side of the tube portion 57. The stopper plate 78 has a circular portion 79 with a larger diameter than the head 65, and a band plate portion 80 that protrudes forward from the front end of the circular portion 79 and is L-shaped in plan view and bends to the right. A through hole 81 is formed in the center of the circular portion 79. A horizontally elongated rectangular hole 82 is formed in the front surface of the band plate portion 80. The circular portion 79 is fixed to the screw hole 66 in the head 65 from the left side of the tubular portion 57 by a hexagonal socket bolt 83 that passes through the through hole 81 from the left side. Then, the tubular portion 57 is prevented from slipping outward to the left by the circular portion 79 of the stopper plate 78. At this time, the band plate portion 80 abuts against the operating knob 75 from the front with the knob 77 passing through the square hole 82. Therefore, the operating knob 75 is prevented from slipping out forward.

[0029] In the grinder 1A configured as described above, when the operation knobs 75, 75 of the left and right operation parts 45A, 45A are in a first rotation position in which the knobs 77, 77 are oriented horizontally as shown in Fig. 10, the eccentric pins 76, 76 are located on the mounting part 10A side. Then, the engagement plates 62, 62 are biased to an inner slide position in which the engagement teeth 73 engage with the engagement grooves 56. Therefore, the rotation of the left and right tube parts 57, 57 is restricted via the engagement plates 62, 62 that engage with the mounting parts 10A, 10A, and the rotation of the side handle 20A is locked.

[0030] When changing the angle of the side handle 20A, the left and right operating knobs 75, 75 are rotated to a second rotation position where the knobs 77, 77 face upward, as shown in FIG. 13. Then, the eccentric pins 76, 76 located closer to the mounting part 10A rotate and move downward. Therefore, the engagement plates 62, 62 move outward against the bias of the coil springs 63, 63 by the amount of outward movement of the eccentric pins 76, 76. In this outer slide position, the engagement teeth 73 are separated from the engagement grooves 56, and the rotation restriction of the cylindrical parts 57, 57 is released, so that the side handle 20A can be rotated to any angle, as shown by the two-dot chain line in FIG. 8. After rotating the side handle 20A, the left and right operation knobs 75, 75 are returned to the first rotation position. Then, the engagement plates 62, 62 are moved to the inner slide position by the urging of the coil springs 63, 63. Therefore, the rotation of the cylindrical parts 57, 57 is restricted and the rotation of the side handle 20A is locked. Note that even if the phase of the engagement teeth 73 and the engagement groove 56 does not match when the engagement plate 62 moves toward the mounting part 10A, by rotating the side handle 20A forward or backward, the engagement plate 62 can move to the inner slide position in a phase where the engagement teeth 73 engage with the engagement groove 56. However, even if only one of the left or right operating knobs 75 is rotated to the second rotation position to move the engagement plate 62 to the outer slide position and release the rotation restriction on the tubular portion 57, the rotation of the opposite tubular portion 57 is restricted, so the rotation lock of the side handle 20A is maintained.

[0031] In this manner, in the grinder 1A of the second embodiment, the side handle 20A is attached so as to be rotatably locked at a predetermined angle to the gear housing 3 by the two operating portions 45A, 45A provided on the side handle 20A. This configuration allows the angle of the side handle 20A to be easily adjusted without tools, and reduces the risk of the angle changing unexpectedly after the angle adjustment. Therefore, the angle adjustment of the side handle 20A can be performed with high reliability. In particular, since the operating portions 45A, 45A are provided at two locations, one on the left and one on the right side of the gear housing 3, the angle of the loop-shaped side handle 20A can be adjusted with good operability.

[0032] Each operating portion 45A includes an engaging plate 62 (engaging member) that can move between an inner slide position (engaging position) in which it engages with an engaging groove 56 (engaged portion) provided in the gear housing 3, and an outer slide position (non-engaging position) in which it does not engage with the engaging groove 56, a coil spring 63 (biasing means) that biases the engaging plate 62 to the engaging position, and an operating knob 75 (operating member) that has an eccentric pin 76 that engages with the engaging plate 62, and by rotating each operating knob 75, each engaging plate 62 can be moved to the outer slide position via the eccentric pin 76. Therefore, by simply rotating the operation knob 75, the rotation lock of the side handle 20A can be released. Each engagement plate 62 is provided with a pin 72 (rotation restricting member) that engages with the cylindrical portion 57 (end portion) of the side handle 20A to be integrated with it in the rotational direction. Therefore, the engagement plate 62 and the side handle 20A can be easily integrated in the rotation direction.

[0033] In the above-mentioned second embodiment, the operation knob is not limited to being provided on the front surface of the cylindrical part, but may be provided on the rear surface or top surface of the cylindrical part. The shape of the knob and the position of the eccentric pin can be changed as appropriate. The relationship between the first rotation position, the second rotation position, and the orientation of the knob can also be changed as appropriate. The coil spring may be disposed between the mounting portion and the engagement plate to bias the engagement plate to the outer slide position, and the eccentric pin of the operation knob may be abutted against the engagement plate. In this case, by rotating the operation knob, the eccentric pin moves the engagement plate to the inner slide position against the bias of the coil spring. The shape of the engagement plate is not limited to the above example. The number and shape of the engagement teeth can be changed according to the number and shape of the engagement grooves of the mounting part. The engagement plate and the cylindrical part can be integrated in the rotational direction by providing a protrusion such as a pin on the inner surface of the cylindrical part and providing a groove on the outer periphery of the engagement plate with which the protrusion engages. However, unlike the above-mentioned example of the engagement plate, it is not necessary that the engagement plate alone is capable of integrating with the cylindrical portion in the rotational direction and sliding with respect to the mounting portion. For example, a separate member may be provided between the cylindrical portion and the engagement plate to restrict the rotation of the engagement plate. The barrel may be separate from the side handle. EXAMPLES

[0034] Fig. 14 is a partial perspective view showing an upper portion of the gear housing to which the side handle is attached, Fig. 15 is a partial side view, and Fig. 16 is a partial front view. In this grinder 1B as well, mounting portions 10B, 10B are formed on the left and right side surfaces of the gear housing 3. As shown in Fig. 17, each mounting portion 10B is recessed into a circular shape when viewed from the side. Each mounting portion 10B has a plurality of engaging recesses 85, 85... extending in the radial direction and formed at equal intervals in the circumferential direction. Similar to the second embodiment, the side handle 20B is looped around the upper side of the gear housing 3. A pair of bottomed tubular portions 86, 86 are provided on both ends of the side handle 20B and positioned coaxially with the mounting portions 10B, 10B. The side handle 20B is also asymmetrical like the embodiment 2. Here, the right end 59 is connected upward to the upper surface of the bottomed tubular portion 86, and the left end 58 extends leftward from the lower surface of the bottomed tubular portion 86, then passes around the left outer side of the bottomed tubular portion 86 and curves upward.

[0035] The bottomed tubular portions 86, 86 are arranged with their openings facing outward to the left and right. As shown in Fig. 18, a plurality of engagement holes 87, 87... extending in the radial direction are formed in the bottom surface of each bottomed tubular portion 86 at equal intervals in the circumferential direction, similar to the engagement recesses 85 of the mounting portion 10B. The engagement holes 87 are the same in number and arrangement as the engagement recesses 85. A screw boss 88 is formed at the center of the bottom surface of each bottomed tubular portion 86, protruding outward to the left and right. The tip of the screw boss 88 protrudes outward beyond the opening surface of the bottomed tubular portion 86. A step is formed at the outer end of the left bottomed tubular portion 86, with the rear half being higher than the front half, and stopper surfaces 89, 89 are formed facing forward above and below the rear half. A step is formed at the outer end of the right bottomed tubular portion 86, with the front half being higher than the rear half, and stopper surfaces 89, 89 are formed facing backward above and below the front half.

[0036] The bottomed cylinder portions 86 are provided with operation portions 45B. As shown in Fig. 19, the operation portion 45B includes an engagement plate 90, a coil spring 91, and an operation plate 92. Since the operation portions 45B are symmetrical, the following description will mainly focus on the right-side operation portion 45B. The engagement plate 90 is a disk-shaped plate having an inner through hole 93 that is penetrated by the screw boss 88 inside the bottomed tubular portion 86. A plurality of engagement pieces 94, 94... are formed on the left side surface of the engagement plate 90, protruding to the left. The engagement pieces 94 extend radially from the inner through hole 93 as a center and are arranged at equal intervals in the circumferential direction. Each engagement piece 94 engages with each engagement hole 87 of the bottomed tubular portion 86 to restrict the engagement plate 90 from rotating inside the bottomed tubular portion 86. When each engagement piece 94 penetrates each engagement hole 87, it can engage with each engagement recess 85 of the mounting portion 10B. A ring groove 95 that is concentric with the inner through hole 93 is formed on the left side surface of the engagement plate 90 inside the engagement piece 94.

[0037] A pair of inner cams 96, 96 are formed on the right side surface of the engagement plate 90. The inner cams 96, 96 have a semicircular spiral shape that gradually protrudes rightward as it moves in the left rotation direction centered on the inner through-hole 93 when viewed from the right side. The lead angles of the inner cams 96 are the same, and the right end surfaces are flat surfaces of the same height. Thus, the inner cams 96, 96 are alternately staggered in height. The coil spring 91 is fitted around the screw boss 88 on the left side of the engagement plate 90. The right end of the coil spring 91 fits into the ring groove 95 of the engagement plate 90 inside the engagement piece 94, and the left end abuts against the bottom surface of the bottomed tubular portion 86. Thus, the engagement plate 90 is biased rightward along the screw boss 88.

[0038] The operation plate 92 is in the shape of a disk having the same outer diameter as the bottomed tubular portion 86. An outer through-hole 97 is formed in the center of the operation plate 92, through which the screw boss 88 passes. A pair of outer cams 98, 98 are formed on the left side surface of the operation plate 92. The outer cams 98, 98 have a semicircular spiral shape that gradually protrudes leftward as it moves in the left rotation direction centered on the outer through-hole 97 when viewed from the left side. The lead angles of the outer cams 98 are the same, and the left end surfaces are flat surfaces of the same height. Thus, the outer cams 98, 98 are staggered in height. The outer cams 98, 98 can mesh with the inner cams 96, 96 of the engagement plate 90, whose rotation is restricted, in the right rotation direction as viewed from the right side. In this meshed position, the engagement plate 90 is in an outer slide position closer to the operation plate 92 due to the bias of the coil spring 91. When the outer cams 98, 98 rotate leftward less than 180° as viewed from the right side from the meshed position, the end faces of the outer cams 98, 98 come into contact with the inner cams 96, 96 and do not mesh with each other. In this non-mesh position, the engagement plate 90 is in an inner slide position away from the operation plate 92 against the bias of the coil spring 91.

[0039] A protrusion 99 is provided on the left side surface of the operation plate 92 near the outer periphery. When the operation plate 92 is in contact with the right end of the bottomed tubular portion 86, the protrusion 99 is located on the rear half side of the lower step and can abut against the upper and lower stopper surfaces 89, 89 in the rotation direction of the operation plate 92. As shown in Figs. 17 to 19, in a first rotation position of the operation plate 92 in which the protrusion 99 abuts against the lower stopper surface 89, the outer cams 98, 98 are in a non-meshing position with respect to the inner cams 96, 96. On the other hand, as shown in Fig. 20, in a second rotation position of the operation plate 92 in which the protrusion 99 abuts against the upper stopper surface 89, the outer cams 98, 98 are in a meshing position with respect to the inner cams 96, 96. A knob portion 100 is provided on the right side surface of the operation plate 92. The knob portion 100 is formed in a diameter direction parallel to the mating surfaces of the outer cams 98, 98. The operation plate 92 is rotatably attached by screwing a screw 102 through a washer 101 into the tip of the screw boss 88 at the center of the knob portion 100. Then, the engagement plate 90 is pressed toward the operation plate 92 by the force of the coil spring 91, causing the inner cams 96, 96 to abut against the outer cams 98, 98.

[0040] In the grinder 1B configured as above, as shown in Fig. 19, when the operation plates 92, 92 of the operation parts 45B, 45B are in the first rotation position, the left and right outer cams 98, 98 are in the meshing position with the inner cams 96, 96 as described above. Therefore, the engagement plates 90, 90 move to the inner slide position against the bias of the coil springs 91, 91. Then, the engagement pieces 94 of the engagement plates 90, 90 penetrate the engagement holes 87 of the bottomed tubular parts 86, 86 and engage with the engagement recesses 85 of the mounting parts 10B, 10B. Therefore, the rotation of the bottomed tubular parts 86, 86 is restricted and the side handle 20B is in the locked state. From this position, when the operation plates 92, 92 are rotated in the opposite directions to each other to reach the second rotation position, the left and right outer cams 98, 98 are in meshing positions with the inner cams 96, 96, as shown in FIG. 20. Therefore, the engagement plates 90, 90 are moved to the outer slide position by the bias of the coil springs 91, 91. Then, the engagement pieces 94 of the engagement plates 90, 90 are separated from the engagement recesses 85 of the mounting parts 10B, 10B. However, since the engagement pieces 94 are engaged with the engagement holes 87 of the bottomed tubular parts 86, 86, the rotation of the engagement plates 90, 90 themselves is restricted. Therefore, the rotation restriction of the bottomed tubular parts 86, 86 is released, and the side handle 20B can be rotated to any angle, as shown by the two-dot chain line in FIG. 15.

[0041] Once the angle of the side handle 20B is determined, the operation plates 92, 92 are rotated again to the first rotation position. Then, as described above, the engagement plates 90, 90 move to the inner slide position and the engagement pieces 94 engage with the engagement recesses 85, so that the rotation of the side handle 20B is locked. However, even if either the left or right operating plate 92 is rotated to the second rotation position to move the engagement plate 90 to the outer slide position and release the rotation restriction on the bottomed tubular portion 86, the rotation of the bottomed tubular portion 86 on the opposite side is restricted, so the rotation lock of the side handle 20B is maintained. Since the operation portion 45B of the side handle 20B is entirely provided on the bottomed tubular portion 86, the side handle 20B can be attached to the attachment portions 10B, 10B even if the left and right orientation is reversed.

[0042] In this manner, in the grinder 1B of the third embodiment, the side handle 20B is attached so as to be rotatably locked at a predetermined angle to the gear housing 3 by the two operating portions 45B, 45B provided on the side handle 20B. This configuration allows the angle of the side handle 20B to be easily adjusted without tools, and reduces the risk of the angle changing unexpectedly after the angle adjustment. Therefore, the angle adjustment of the side handle 20B can be performed with high reliability. In particular, since the operating portions 45B, 45B are provided at two locations, one on the left and one on the right side of the gear housing 3, the angle of the loop-shaped side handle 20B can be adjusted with good operability.

[0043] Each operating portion 45B includes an engaging plate 90 (engaging member) that can move between an inner slide position (engaging position) in which it engages with an engaging recess 85 (engaged portion) provided in the gear housing 3 and an outer slide position (non-engaging position) in which it does not engage with the engaging recess 85, a coil spring 91 (biasing means) that biases the engaging plate 90 to the outer slide position, and an operating plate 92 (operating member) that abuts against the engaging plate 90 at the outer slide position, and an inner cam 96 and an outer cam 98 (cam) are formed on the abutting surfaces of the engaging plate 90 and the operating plate 92, respectively, which can be switched between an engaging position in which they engage with each other in the rotational direction and a non-engaging position in which they do not engage with each other in the rotational direction and their end faces abut, and by rotating the operating plate 92, the engaging plate 90 is moved to the inner slide position in the non-engaging position, and the engaging plate 90 is moved to the outer slide position in the engaging position. Therefore, by simply rotating the operation plate 92, the angle of the side handle 20B can be adjusted. The side handle 20B can be attached to the gear housing 3 even if the left and right orientations are reversed. Therefore, the side handle 20B can be assembled without worrying about the orientation thereof, making the assembly easier.

[0044] In the third embodiment, the numbers and arrangements of the engagement recesses, engagement holes and engagement pieces are not limited to those in the above example. The coil spring may be disposed so as to surround the outside of the engagement piece rather than the inside of the engagement piece. The shapes of the inner cam and the outer cam are not limited to the above example in which a pair of semicircular cams are arranged, but may be a pair of cams that rotate over half a circumference or more so as to be able to mesh and disengage with each other. The operation plate may be in the shape of a lever instead of a knob. The bottomed tubular portion may be separate from the side handle. The positions of the step provided at the end of the bottomed cylinder and the protrusion provided on the operation plate may be reversed, or they may be provided on the same side so that the rotation direction of the operation plate is the same on the left and right.

[0045] In addition, in common to all the embodiments, the side handle is not limited to an inverted U-shape when viewed from the front. It may be a semicircular shape that bulges out to the left and right. It may be entirely made of metal or entirely made of resin. The positioning of the side handle is not limited to angle adjustment, but may also be achieved by sliding the side handle in a predetermined direction to fix the mounting position. The position of the operation unit can also be changed as needed. Operation units can also be provided in three or more locations. The power tool does not have to be a DC tool, but may be an AC tool that uses a commercial power source. The power tool is not limited to a grinder. The present disclosure can be applied to other grinding and polishing tools such as polishers and sanders, cutting tools such as circular saws and cutters, etc. Therefore, the power tool is not limited to an electric tool. The present disclosure can be applied to air tools, engine tools, etc. Therefore, the attachment position of the side handle is not limited to the gear housing, but may be the motor housing or another housing. [Explanation of symbols]

[0046] 1, 1A, 1B·· grinder, 2·· main body housing, 3·· gear housing, 4·· spindle, 10, 10A, 10B·· mounting portion, 11·· inner cam surface, 15, 61·· connecting bolt, 20, 20A, 20B·· ​​side handle, 22·· arm portion, 23·· thin portion, 25·· outer cam surface, 35·· retaining cover, 45, 45A, 45B·· operation portion, 46·· operation plate, 48·· relief hole, 49·· lock hole, 51·· operation piece, 56·· engagement groove, 57·· cylindrical portion, 62, 90·· engagement plate, 73·· engagement teeth, 75·· operation knob, 85·· engagement recess, 86·· cylindrical portion with base, 87·· engagement hole, 92·· operation plate, 96·· inner cam, 98·· outer cam.

Claims

1. A power tool having a side handle attached to a side surface of a tool body, The side handle is attached so as to be positionable with respect to the tool body by operation portions provided on the side handle at two positions on the left and right sides of the tool body, and Each of the operating parts includes an operating member that is movable between a first position for positioning the side handle relative to the tool body and a second position for releasing the positioning; and biasing means for biasing the operating member to the first position, The side handle has arms at both ends that are rotatably provided with respect to both sides of the tool body, and an engagement portion that engages with each other in a rotational direction is provided between each of the arms and the tool body, and the operation portion is provided on each of the arms, a first operating member that, in a first position, restricts the bending of the arm and maintains the engagement between the engagement portion on the arm side and the engagement portion on the tool body side to position the side handle in a rotational direction, and, in the second position, allows the arm to bend and releases the engagement between the engagement portion on the arm side and the engagement portion on the tool body side to allow the side handle to rotate.

2. The power tool according to claim 1, characterized in that mounting members for rotatably supporting each of the arm portions of the side handle are provided on the left and right sides of the tool body, and each of the operating members engages with the mounting members in the first position to restrict bending of the arm portions, and in the second position, the operating members are disengaged from the mounting members to allow bending of the arm portions.

3. 3. The power tool according to claim 1, wherein one of the engaging portion on the arm side and the engaging portion on the tool body side is provided with a pressing means for pressing the other engaging portion.

4. A power tool having a side handle attached to a side of a tool body, The side handle has a pair of cylindrical portions with an axis extending in the left-right direction at both ends of the tool body, and is attached so as to be positionable with respect to the tool body by an operating portion provided on each of the cylindrical portions. Each of the operating portions includes an engaging member provided in the cylindrical portion and movable in the left-right direction between an engaging position where the engaging member engages with an engaged portion provided on the tool body and a non-engaged position where the engaging member does not engage with the engaged portion, a biasing means provided in the cylindrical portion and biasing the engaging member to the engaging position, and an operating member having an eccentric pin that protrudes into the cylindrical portion and engages with the engaging member, The engaging members can be moved to the disengaging position via the eccentric pin by rotating the operating members, A power tool according to claim 1, wherein each of the engagement members is provided with a rotation restricting member that engages with an inner surface of the cylindrical portion to integrate the engagement member with the cylindrical portion in the rotation direction of the side handle.

Images