Work machine

Abstract

The invention improves operability of a working machine. The electric tool (400) is provided with a motor, a clamping shaft (412), a clamping handle (62) and a tool holding part (430). The tool holding part (430) is provided with a clamping part (438, 448) and a mounting seat (452). The tool holding part (430) can be in either a fixed state or a temporary holding state even if the operating force applied to the clamping handle (62) is released. The temporary holding state includes at least one of a first state, a second state, and a third state. The first state is a state in which rotation of the tip tool (402) and detachment of the tip tool (402) are restricted. In the second state, the tip tool (402) can be rotated from one rotation position to another rotation position in a state in which disengagement of the tip tool (402) is restricted. In the third state, at least one of attaching the tip tool (402) to the tool holding part (430) and detaching the tip tool (402) from the tool holding part (430) can be performed.

Description

Technical Field

[0001] The present invention relates to a working machine. Background Art

[0002] The power tool disclosed in Patent Document 1 includes a tool shaft that clamps a tool tip from below, a pair of clamps that can swing about a pin to restrict vertical movement of the tool shaft, and a clamp handle that allows an operator to change the state of the clamps.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2021-16917

[0006] Patent Document 2: U.S. Patent Application Publication No. 2008 / 0190259 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] In a work machine capable of loading and unloading a front end tool, or a work machine capable of changing the direction of a front end tool, there is a demand for improved operability in loading and unloading operations or direction change operations of the front end tool. In addition, in the work machine, there are various mechanisms for holding the front end tool. In the mechanism described in Patent Document 1, the front end tool is held in a manner that transmits the power of the motor to the front end tool by engaging with a recessed portion on the side of the work machine body and a convex portion of the front end tool. In the mechanism described in Patent Document 2, a plurality of protrusions are formed on the work machine body, and the protrusions engage with a plurality of holes in the front end tool, thereby holding the front end tool in a manner that transmits the power of the motor to the front end tool.

[0009] Here, in the mechanism of Patent Document 1, when attaching or detaching the tip tool, the operator must engage the tool shaft with the clamp, resulting in low operability. The mechanism of Patent Document 2 is similarly required, requiring the operator to attach or detach the tool shaft, resulting in low operability.

[0010] Furthermore, changing the rotational position of the tool tip requires operating the handle to fully extract the tool shaft and then reinstall it, or operating the handle to move the tool shaft to a position where it cannot be fully extracted. This is cumbersome and inefficient. Furthermore, assembling the tool tip requires operating the tool shaft, which requires additional work beyond clamping the handle, making the process cumbersome.

[0011] An object of the present invention is to provide a working machine with improved operability.

[0012] Solutions to Problems

[0013] An operating machine in one embodiment comprises: a motor; an output shaft, which is rotated and driven by the motor around an axis; an operating part, which can be operated by an operator; and a tool holding part, which is held by the output shaft and has a clamping part that can move according to the movement of the operating part and a mounting seat that clamps the front end tool in the clamping direction together with the clamping part to hold the front end tool.

[0014] Even if the operating force applied to the operating part is released, the tool holding part can be in either a fixed state or a temporary holding state. The fixed state is a state in which the front end tool is fixed to the tool holding part by applying a force in the clamping direction to the front end tool, and the temporary holding state is a state in which the force in the clamping direction applied to the front end tool is weaker than that in the fixed state.

[0015] The tool holding portion in the fixed state is configured to be capable of holding the tip tool at a plurality of rotational positions around the axis by the clamping portion.

[0016] The temporary holding state includes a first state that restricts the rotation of the tip tool and the removal of the tip tool from the tool holding portion, and includes at least one of a second state and a third state in which force is applied to the tip tool held by the tool holding portion in the first state.

[0017] In the second state, the tip tool can be rotated from one of the plurality of rotational positions to another rotational position while the clamp member restricts detachment of the tip tool from the tool holding portion.

[0018] In the third state, the front end tool is allowed to move in the direction along the axis while maintaining the clamping part held by the output shaft, and force is applied to the front end tool to switch between the first state and the third state, so that at least one of the front end tool can be installed on the tool holding portion and removed from the tool holding portion.

[0019] The effects of the invention are as follows.

[0020] According to the present invention, the operability of the working machine can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a perspective view showing an electric power tool as a working machine according to the first embodiment.

[0022] Figure 2 It is a three-dimensional diagram of the front-end tool.

[0023] Figure 3is a cross-sectional view showing the internal structure of the electric tool ( Figure 1 AA line cross-sectional view).

[0024] Figure 4 It will Figure 3 An enlarged cross-sectional view of the front of a power tool.

[0025] Figure 5 It is an explanatory diagram showing a pusher.

[0026] Figure 6 is a cross-sectional view showing the internal structure of the front portion of the electric tool ( Figure 3 BB line cross-sectional view).

[0027] Figure 7 It is a perspective view of the unit housing.

[0028] Figure 8 It is a perspective view showing a state in which the first clamp member and the second clamp member are supported by the clamp bracket.

[0029] Figure 9 This is a front view of the first clamp member and the second clamp member as seen from the right side in the left-right direction.

[0030] Figure 10 It is a perspective view showing the first clamping member.

[0031] Figure 11 It is a perspective view showing the second clamping member.

[0032] Figure 12 It is an explanatory diagram showing a state in which the clamping member holds the tip tool.

[0033] Figure 13 This is an explanatory diagram showing a state in which the first clamp member and the second clamp member are in the process of rotating toward the closing side in accordance with the rotation of the clamp handle.

[0034] Figure 14 This is an explanatory diagram showing a state in which the first clamp member and the second clamp member temporarily hold the tip tool.

[0035] Figure 15 This is an explanatory diagram showing a state in which the first clamp member and the second clamp member are located at a released position (closed position) and the tool tip is detached.

[0036] Figure 16 This is an explanatory diagram showing a state in which the clamp handle returns to the holding state position and the O-ring urges the first clamp member and the second clamp member.

[0037] Figure 17 This is an explanatory diagram showing a state where the first clamp member and the second clamp member are inserted into the hole portion of the tip tool from above.

[0038] Figure 18 This is an explanatory diagram showing a state in which the first clamp member and the second clamp member temporarily hold the tip tool.

[0039] Figure 19 It is an explanatory diagram showing a change in position of the clamp member relative to the hole portion of the tip tool when viewed in the clamping direction (up-down direction).

[0040] Figure 20 This is an explanatory diagram showing a state in which a clamp member holds a tip tool according to a modification of the first embodiment.

[0041] Figure 21 This is an explanatory diagram showing a state in which a clamp member according to a modification of the first embodiment temporarily holds a tip tool.

[0042] Figure 22 This is an explanatory diagram showing a state in which the clamp member according to a modification of the first embodiment is located at a release position (closed position) and the tool tip is detached.

[0043] Figure 23 It is an explanatory diagram of a temporary holding state (first state) of an electric power tool as a working machine according to a second embodiment.

[0044] Figure 24 It will Figure 23 An enlarged explanatory diagram of the first clamping member and the second clamping member, etc.

[0045] Figure 25 It shows Figure 23 Illustration of the arrangement relationship between the tool holding portion and the front end tool ( Figure 23 AA line cross-sectional view).

[0046] Figure 26 yes Figure 23 An illustration of the temporary holding state (second state) of the electric tool.

[0047] Figure 27 It is shown in Figure 23 Explanatory diagram of the state in which the front end tool is rotated in the electric tool ( Figure 26 BB line cross-sectional view and Figure 27 CC line cross-sectional view).

[0048] Figure 28 It is shown in Figure 23 An explanatory diagram of a state in which the rotation of the front tool of the electric tool is completed.

[0049] Figure 29 This is an explanatory diagram showing a state in which a tool bit is fixed to an electric power tool as a working machine according to a third embodiment.

[0050] Figure 30 It shows Figure 29 Illustration of the temporary holding state of the power tool.

[0051] Figure 31 It is shown from Figure 29 An explanatory diagram showing the change from the fixed state of the tool tip in the electric tool to the temporary holding state (first state) and the temporary holding state (second state).

[0052] Figure 32 It is shown from Figure 29 Illustration of the change from the state where the protrusion of the seating portion of the electric tool is inserted into the through hole of the tip tool to the state where the protrusion is separated from the through hole ( Figure 31 DD line, EE line, and FF line cross-sectional views).

[0053] Figure 33 This is an explanatory diagram showing a state in which a tool tip is fixed to an electric power tool of a working machine as a modified example of the third embodiment. DETAILED DESCRIPTION

[0054] The following describes the first, second, and third embodiments of the present invention, as well as various variations thereof, with reference to the accompanying drawings. In each drawing, the directions indicated by the front and rear arrows are referred to as the front-to-back direction, the directions indicated by the left and right arrows are referred to as the left-to-right direction, and the directions indicated by the up and down arrows are referred to as the up-to-down direction. The front-to-back direction, the left-to-right direction, and the up-to-down direction are orthogonal to each other.

[0055] The clamp bracket 126 and the clamping parts 158, 178 ( Figure 4 ) is referred to as the clamping direction. The up-down direction is an example of a clamping direction. The upper side of the up-down direction is the side where the tip tool 16 is clamped, and the lower side is the side where the tip tool 16 is released. In the following text, the up-down direction may be referred to as the clamping direction.

[0056] The front-back direction is an example of a direction intersecting the clamping direction. The side where the tip tool 16 is located is the front side, and the side where the battery pack 14 described below is located is the rear side. The left-right direction is an example of an axial direction intersecting both the clamping direction and the intersecting direction.

[0057] [Structure of the first embodiment] Figure 1 , an example of a working tool is shown in FIG. The power tool 10 includes a housing 12 and a battery pack 14. The power tool 10 is configured so that a tool tip 16 can be replaced with another tool tip. The power tool 10 is a cordless multi-function tool that operates using power from the battery pack 14. For example, the power tool 10 vibrates the tool tip 16 in the direction indicated by the arrow RW.

[0058] The housing 12 forms the outer shell of the power tool 10. The battery pack 14 is configured to be attachable to and detachable from the rear end of the housing 12. Furthermore, the power tool 10 can switch between a fixed state, a temporarily retained state, and a released state for the tool tip 16 simply by operating the clamping handle 62, as described in detail below. The power tool 10 can switch from the fixed state to the released state, and vice versa, simply by operating the clamping handle 62.

[0059] Front-end tools such as Figure 2 As shown, the front end tool 16 is a member extending in the front-back direction and has a flat plate portion 17 on the front side and a mounting portion 18 on the rear side. The flat plate portion 17 is formed in a plate shape having a flat surface along the front-back direction. A blade portion 17A is formed at the front end of the flat plate portion 17.

[0060] Mounting portion 18 includes a plate portion 19 and a protrusion 21. Plate portion 19 is located obliquely above flat plate portion 17. Protrusion 21 protrudes upward from the upper surface of plate portion 19. When viewed from above, outer peripheral portion 21A of protrusion 21 has a shape in which a plurality of recesses 21B and a plurality of protrusions 21C are alternately arranged in the circumferential direction. An upper wall 22 is formed at the upper end of protrusion 21.

[0061] The upper wall 22 is formed into a plate having thickness in the vertical direction. A hole portion 24 and a plurality of through holes 26 are formed in the center portion of the upper wall 22, which pass through the upper wall 22 in the vertical direction. The hole portion 24 has a circular insertion portion 25 and four cutout portions 27 extending radially outward from the insertion portion 25. The following clamping member 142 ( Figure 4 A plurality of through holes 26 are arranged at intervals in the circumferential direction on the outer periphery of the upper wall 22 .

[0062] <shell> Figure 3 1 shows the internal structure of the power tool 10. As an example, the housing 12 is a resin molded body. The housing 12 is formed into a cylindrical shape with a central axis extending along the front-to-back direction. A lower opening 13 is formed at the lower end of the front side of the housing 12. An upper opening 15 is formed at the upper end of the front side of the housing 12.

[0063] A clamping handle 62 and a trigger 61, described below, are provided on the upper portion of the housing 12. The trigger 61 is connected to the switch 41. When the operator operates the trigger 61, the switch 41 is switched on and off, switching the motor 52 between driving and stopping. The housing 12 houses the inner case 32, the control board 40, the switch 41, and other components.

[0064] Inner shell Figure 4As shown, the inner housing 32 is formed into a bottomed, cylindrical shape with an open front. The inner housing 32 is located at a distance from the inner surface of the outer housing 12. As an example, the inner housing 32 includes a motor housing 34, an intermediate housing 35, and a bracket 36. The rear end of the intermediate housing 35 is attached to the motor housing 34. The motor 52 is housed inside the motor housing 34.

[0065] (Bracket) Bracket 36 is a metal component, for example, made of aluminum. Bracket 36 has a mounting portion 37, a barrel 38, and a support wall 39. The intermediate housing 35 is mounted on the mounting portion 37. The barrel 38 is located further forward than the mounting portion 37. The barrel 38 is formed into a cylindrical shape having a central axis extending in the vertical direction. The support wall 39 is provided at the upper end of the barrel 38. The support wall 39 supports both axial ends of the cylindrical pin 46. The axial direction of the pin 46 extends in the left-right direction. A ball bearing 42, a needle bearing 43, an oil seal 44, and the output shaft portion 90 described below are provided inside the barrel 38.

[0066] The ball bearing 42 is located forward and above the rocker arm 88 (described below). The ball bearing 42 and the needle bearing 43 have a central axis extending in the vertical direction. The ball bearing 42 rotatably supports the guide portion 98 (described below) about its central axis. The needle bearing 43 is located forward and below the rocker arm 88 and rotatably supports the housing portion 94 (described below). The oil seal 44 is located below the needle bearing 43. The oil seal 44 closes the gap between the lower portion of the bracket 36 and the lower portion of the housing portion 94.

[0067] The outer housing 12 supports the cylindrical portion 38 via a rubber member 48. In other words, the inner housing 32 is supported by the outer housing 12 via the rubber member 48, thereby floating relative to the outer housing 12. The rubber member 48 is formed into a C-shape when viewed from above and below. When the motor 52 (described below) operates, the rubber member 48 suppresses the propagation of vibration from the bracket 36 to the outer housing 12.

[0068] Motor, etc. Figure 3 As shown, motor 52 is located in the center of housing 12 in the front-to-back direction. Motor 52 is a brushless motor. Motor 52 has a rotating shaft 53. Rotating shaft 53 extends in the front-to-back direction. The control board 40 is equipped with a controller, switching elements, and other components that control the drive of motor 52.

[0069] Clamping handle Figure 4As shown, the clamping handle 62 is an example of an operating portion that can be operated by an operator. The clamping handle 62 includes a handle body 63 and a pusher 64. The handle body 63 includes a pair of base ends 63A and a gripping portion 63B extending rearward from the pair of base ends 63A. The pair of base ends 63A are spaced apart from each other in the left-right direction. The pusher 64 is fixed between the pair of base ends 63A. Here, the pin 46 passes through the pusher 64 and the pair of base ends 63A in the left-right direction. In other words, the clamping handle 62 can be rotatably connected to the support wall 39 with the pin 46 as the center axis.

[0070] The gripping portion 63B is exposed to the outside of the housing 12 through the upper opening 15. This allows the operator to operate the clamping handle 62. The gripping portion 63B is gripped by the operator and rotated around the pin 46. In the following description, regarding the rotation operation of the clamping handle 62, the action of rotating the gripping portion 63B toward the front is referred to as a "releasing action," and the action of rotating the gripping portion 63B toward the rear is referred to as an "assembling action." Regarding the rotation direction of the clamping handle 62, the rotation direction when the gripping portion 63B is toward the front is referred to as the +R direction, and the rotation direction when the gripping portion 63B is toward the rear is referred to as the -R direction.

[0071] The clamping handle 62 can hold the clamping shaft 112 described below at the first position P1 ( Figure 12 ) and the second position P2( Figure 15 ) between the third position P3( Figure 14 More specifically, the clamping shaft 112, described below, is configured to move between a first position P1 and a second position P2 in response to the movement of the clamping handle 62. The clamping handle 62 is capable of being held at a third position P3 (handle temporary holding position) between the first position P1 and the second position P2. When the operating force is released in the release state of the clamping member 142, described below, the clamping handle 62 is capable of being held between a fixed position when the clamping member 142 is in the clamped state and a release position when the clamping member 142 is in the release state.

[0072] Pusher Figure 5 FIG. 1 shows a front end tool 16 ( Figure 1 ) when the pusher 64 is in the position. The position of the pusher 64 changes with the rotation of the clamping handle 62. The pusher 64 is a block-shaped metal component. The pusher 64 can contact or separate from the upper end surface 115 of the clamping shaft 112 described below. The contact position of the pusher 64 with the upper end surface 115 changes with the rotation of the clamping handle 62.

[0073] The pusher 64 is capable of moving the clamp shaft 112 to the third position P3 ( Figure 14) is an example of a moving portion that moves. Furthermore, in the power tool 10, the position of the tip tool 16 between the fixed (held) state, the temporarily held state, and the released state is switched by rotating the pusher 64 (clamping handle 62). The pusher 64 has an outer peripheral portion 65 when viewed in the axial direction of the pin 46, i.e., in the left-right direction.

[0074] The outer peripheral portion 65 includes a non-contact portion 66 that does not contact the clamping shaft 112 and a contact portion 71 that can contact the clamping shaft 112. The non-contact portion 66 includes a flat surface 67 extending along the front-to-back direction and a flat surface 68 extending along the top-to-bottom direction. The contact portion 71 includes a first flat surface 72, a curved surface 73, and a second flat surface 74. The already described +R direction corresponds to the rotational direction of the pusher 64 when the front end tool 16 is removed. The -R direction corresponds to the rotational direction of the pusher 64 when the front end tool 16 is attached.

[0075] Plane 68, first plane 72, curved surface 73, second plane 74, and plane 67 exist in this order in the -R direction. When viewed from the left and right sides, plane 68 forms a substantially right angle with first plane 72. Second plane 74 forms an obtuse angle with plane 67. The shortest distance L1 from center C1 of pin 46 to first plane 72 is shorter than the shortest distance L2 from center C1 to second plane 74. Distance L3 from center C1 to curved surface 73 increases continuously from starting point A1 of curved surface 73 in the -R direction toward end point A2. Second plane 74 extends upward and rearward from end point A2.

[0076] In the pusher 64, when the clamping shaft 112 is at the second position P2 ( Figure 15 ) and when the operating force on the clamp handle 62 is released, the clamp shaft 112 is moved to the third position P3 ( Figure 14 ) is formed in a moving manner to form a contact portion 71.

[0077] 〈〈Drive mechanism〉〉 Figure 4 As shown, the drive mechanism 80 includes a main shaft 82, a ball bearing 84, an eccentric shaft portion 86, a rocker arm 88, and an output shaft portion 90. The output shaft portion 90 includes a clamp shaft 112 and a clamp bracket 126, and is configured to allow the clamp shaft 112 to swing about its own axis.

[0078] <Main Shaft, Etc.> A main shaft 82 is mounted in front of the rotating shaft 53 of the motor 52. The main shaft 82 extends in the front-to-back direction and rotates integrally with the rotating shaft 53. A ball bearing 84 is supported by the intermediate housing 35. The ball bearing 84 rotatably supports the central portion of the main shaft 82 in the front-to-back direction. An eccentric shaft portion 86 is provided at the front end of the main shaft 82. The central axis of the eccentric shaft portion 86 is located parallel to and offset from the central axis of the main shaft 82.

[0079] Rocker Arm 88 includes a mounting portion 88A that is annular when viewed from above and below, and a U-shaped arm portion 88B that extends rearward from mounting portion 88A. Mounting portion 88A is fixed to the outer circumference of the unit housing 92 (described below). Arm portion 88B grips the outer circumference of the eccentric shaft portion 86. In other words, rocker arm 88 couples the rotation of the eccentric shaft portion 86 with the movement of the unit housing 92. Specifically, the rotation of the eccentric shaft portion 86 causes arm portion 88B to swing left and right. This causes the output shaft portion 90 to vibrate in the rotational direction centered on its own axis.

[0080] Output shaft Figure 6 1 shows the internal structure of the front portion of the electric tool 10. In addition, in order to clearly show the shape of each part, hatching is omitted.

[0081] The output shaft 90 constitutes a vibrating portion of the electric tool 10 that holds the tool bit 16 and includes a unit housing 92 , a clamp shaft 112 , a clamp bracket 126 , a support pin 132 , a clamp spring 134 , an O-ring 136 , and a clamp member 142 .

[0082] (Unit Case) The unit case 92 includes a housing portion 94, an upper wall portion 96, a guide portion 98, a first enlarged diameter portion 102, and a second enlarged diameter portion 104. The unit case 92 includes (or supports) a tool holding portion 100.

[0083] The housing portion 94 is a cylindrical portion with the vertical direction as its axial direction. It has an outer circumferential surface 94A and an inner circumferential surface 94B, which are circular when viewed from the top and bottom. The rocker arm 88 is fixed to the upper portion of the housing portion 94. The vertical center portion of the housing portion 94 contacts the inner ring portion of the needle roller bearing 43. The lower portion of the housing portion 94 contacts the oil seal 44. A clamp bracket 126, described below, is housed within the housing portion 94, below the portion facing the oil seal 44.

[0084] The upper wall portion 96 is formed into a disc-shaped portion and covers the upper end of the storage portion 94. A guide portion 98 extends upward from the upper wall portion 96. The guide portion 98 is a cylindrical portion having a central axis extending in the vertical direction. The guide portion 98 is supported by the ball bearing 42 so as to be rotatable about the central axis extending in the vertical direction. A through hole 99 is formed in the upper wall portion 96 and the guide portion 98. The through hole 99 extends vertically through the upper wall portion 96 and the guide portion 98.

[0085] The first expanded diameter portion 102 extends downward from the lower end of the housing portion 94. The first expanded diameter portion 102 is a cylindrical portion having a central axis extending in the vertical direction. The inner diameter of the first expanded diameter portion 102 is larger than that of the housing portion 94. In other words, the first expanded diameter portion 102 is a portion that expands relative to the housing portion 94. Consequently, a stepped surface 103 is formed between the housing portion 94 and the first expanded diameter portion 102.

[0086] The second expanded diameter portion 104 extends downward from the lower end of the first expanded diameter portion 102. The second expanded diameter portion 104 is a cylindrical portion having a central axis extending in the vertical direction. The inner diameter of the second expanded diameter portion 104 is larger than that of the first expanded diameter portion 102. In other words, the second expanded diameter portion 104 is a portion that is expanded relative to the first expanded diameter portion 102. As a result, a stepped surface 105 is formed between the first expanded diameter portion 102 and the second expanded diameter portion 104.

[0087] like Figure 7 As shown, a mounting seat 107 (clamping base) is provided on the inner circumferential surface 104A of the second enlarged diameter portion 104. The mounting seat 107 engages with the front end tool 16 in the vertical direction (the extension direction of the center axis C2 described below) as the rotation direction of the axis. In the mounting seat 107, a plurality of recessed portions 107A and convex portions 107B are alternately arranged along the circumferential direction of the inner circumferential surface 104A. An inclined surface 108 is formed at the lower end portion of the inner circumferential surface 104A. The mounting seat 107 and the front end tool 16 ( Figure 2 ) contact, thereby being able to clamp the shaft 112 ( Figure 3 ) is transmitted to the front end tool 16. A through hole 106 is formed in the second enlarged diameter portion 104 and passes through the center of the second enlarged diameter portion 104 in the radial direction. The mounting seat 107 is a part of the tool holding portion 100. The mounting seat 107 is connected to the clamping portions 158 and 178 ( Figure 4 ) together with the front end tool 16 in the clamping direction ( Figure 4 ) to hold the front end tool 16.

[0088] (Clamping shaft) Figure 6 As shown, the clamping shaft 112 is in the first position P1 and the second position P2 ( Figure 15 ) between the clamping shaft 112 and the clamping bracket 126. The clamping shaft 112 is an example of an output shaft extending in the vertical direction from the clamping bracket 126 described below. The clamping shaft 112 is a metal component having a first shaft portion 114, a second shaft portion 116, a flange portion 118, a support portion 122, and a guide pin 124. The first shaft portion 114, the second shaft portion 116, the flange portion 118, and the support portion 122 are integrally formed.

[0089] The first shaft portion 114 is formed into a cylindrical shape having a central axis C2 extending in the vertical direction. The first shaft portion 114 extends from the inner side of the housing portion 94 through the through-hole 99 and projects upward beyond the upper end of the guide portion 98. The outer peripheral surface of the first shaft portion 114 contacts the inner peripheral surface of the through-hole 99. In other words, the first shaft portion 114 is guided in the vertical direction by the guide portion 98. The upper end surface of the first shaft portion 114 is referred to as the upper end surface 115. The upper end surface 115 is a flat surface extending in both the front-to-back direction and the left-to-right direction. The upper end surface 115 is located in a position capable of contacting the outer peripheral portion 65.

[0090] The second shaft portion 116 extends downward from the lower end of the first shaft portion 114. The second shaft portion 116 is formed in a cylindrical shape. As an example, the outer diameter of the second shaft portion 116 is larger than the outer diameter of the first shaft portion 114.

[0091] The flange portion 118 is a disc-shaped portion that protrudes radially outward from the boundary between the first shaft portion 114 and the second shaft portion 116. The flange portion 118 is located inside the housing portion 94 and below the upper wall portion 96.

[0092] The support portion 122 extends downward from the lower end portion of the second shaft portion 116. The support portion 122 includes an opposing wall 122A and an opposing wall 122B. The opposing wall 122A and the opposing wall 122B are opposed to each other with a gap therebetween in the left-right direction.

[0093] The guide pin 124 is an example of a pin member. The guide pin 124 is formed into a cylindrical shape having a central axis along the left-right direction. The guide pin 124 connects the opposing wall 122A and the opposing wall 122B in the left-right direction. In other words, the support portion 122 supports both axial ends of the guide pin 124. In this way, the guide pin 124 is attached to the clamping shaft 112. The guide pin 124 is inserted into the movable portions 156 and 176 ( Figure 9 ) of the connecting rod holes 157, 177 ( Figure 9 )middle.

[0094] (Clamping bracket) Figure 8 As shown, the clamp bracket 126 has a base 127, a plurality of vertical wall portions 128, a horizontal wall portion 129, and a support pin 132. The clamp bracket 126 is fixed to the unit housing 92 ( Figure 6 ) is formed inside the clamping bracket 126. Figure 6 ) and a space portion of a size that allows the clamping part 142 to move.

[0095] The base 127 is formed into a circular shape when viewed from the top and bottom directions. The base 127 is located at the second enlarged diameter portion 104 ( Figure 6) on the inner side. A lower surface 127A is formed at the lower end of the base 127, extending in both the front-to-back direction and the left-to-right direction. An opening 127B extends vertically through the base 127. When viewed from below, the opening 127B is formed into a rectangular shape with long sides extending in the front-to-back direction and short sides extending in the left-to-right direction. The opening 127B is sized to allow the clamping member 142 to move.

[0096] The plurality of vertical wall portions 128 stand upright from the base portion 127. The plurality of vertical wall portions 128 are arranged at intervals in the circumferential direction and the radial direction. The plurality of vertical wall portions 128 are located at the first enlarged diameter portion 102 ( Figure 6 ) is formed on the inner side of the plurality of vertical wall portions 128. A recessed portion 131 recessed in the radial direction is formed in the plurality of vertical wall portions 128. The transverse wall portion 129 connects the upper end portions of the plurality of vertical wall portions 128.

[0097] (Support pin) The support pin 132 is an example of a support shaft extending in the left-right direction. The support pin 132 is formed into a cylindrical shape. The support pin 132 passes through the center position of the base 127 and penetrates the base 127 in the radial direction. The support pin 132 is fixed to the base 127 and does not rotate. The left and right ends of the support pin 132 are fixed to the second enlarged diameter portion 104 ( Figure 6 ) and be supported.

[0098] (Clamping spring) Figure 6 As shown, the clamping spring 134 is provided between the second shaft portion 116 of the clamping shaft 112 and the inner peripheral surface 94B of the unit housing 92. The clamping spring 134 can be extended and retracted in the vertical direction. The upper end of the clamping spring 134 is engaged with the lower surface of the flange portion 118. The lower end of the clamping spring 134 is engaged with the horizontal wall portion 129 ( Figure 8 )touch.

[0099] The clamp spring 134 presses the flange portion 118 upward, thereby applying a pressing force to the clamp shaft 112. This in turn applies an upward pressing force to the guide pin 124. Furthermore, the first shaft portion 114 is held in a state protruding upward from the guide portion 98 by the pressing force of the clamp spring 134.

[0100] (O-ring) Figure 8 As shown, O-ring 136 is an example of a force-applying member and an example of an annular elastic body. O-ring 136 is a toroidal rubber component. O-ring 136 spans the plurality of vertical walls 128 and wraps around recess 131. Furthermore, the front-to-back portions of the circumferential portion of O-ring 136 serve as pressing portions 137. Pressing portions 137 are portions that do not contact the plurality of vertical walls 128. Pressing portions 137 are elastically deformable at least in the front-to-back direction.

[0101] The movable parts 156, 176 ( Figure 9) is located inside the O-ring 136. When the clamping member 142 is located at the release position, a portion of the O-ring 136 (the outer peripheral portion of the pressing portion 137) is in contact with the inner peripheral surface 94B ( Figure 6 ) contact. This is because the O-ring 136 is deformed into an elliptical shape by the movable parts 156, 176. Here, when the movable parts 156, 176 are in contact with the pressing part 137, the elastically deformed O-ring 136 applies a force inward to the movable parts 156, 176. That is, the movable parts 156, 176 are urged inward by the restoring force of the deformed O-ring 136, and the clamping parts 158, 178 are urged outward. More specifically, the pressing part 137 is deformed in the front-to-back direction (radial direction) by the movable parts 156, 176 that have moved outward (front-to-back direction). As a result, the movable parts 156, 176 are urged radially inward (front-to-back direction) by the restoring force of the O-ring 136 that has been deformed into an elliptical shape. Thus, the pressing portion 137 applies radially inward pressing force (restoring force) to the movable portions 156 and 176. Thus, the O-ring 136 is provided on the clamp bracket 126 so as to urge the clamp member 142 radially inward when in contact with the clamp member 142.

[0102] like Figure 9 As shown, the O-ring 136 surrounds the movable portions 156 and 176 of both the first clamping member 144 and the second clamping member 164. The O-ring 136 is an example of a biasing member that biases the movable portions 156 and 176 toward the open position described below. In other words, the O-ring 136 biases the clamping portions 158 and 178, which are in the closed position described below, toward the open position (so that they move toward the open position). Specifically, the O-ring 136 biases both the movable portions 156 and 176 toward the inner side (center side) in the front-to-back direction. Furthermore, the O-ring 136 is configured to continue biasing the clamping portions 158 and 178 even when they are in the open position.

[0103] (Clamping Member) The clamping member 142 is rotatable about the support pin 132. The clamping member 142 includes a first clamping member 144 and a second clamping member 164, which are rotatable in opposite directions about the support pin 132. A portion of the first clamping member 144 is located to the right of a portion of the second clamping member 164. The following description of the positions of the various portions of the first clamping member 144 and the second clamping member 164 will be based on a configuration in which the clamping portion 158 and the clamping portion 178 are in a closed position, in which they are in contact with each other.

[0104] The clamp member 142 has a pair of clamping portions 158 and 178. Movable portions 156 and 176 biased by the O-ring 136 are provided on the other side (upper side) of the clamp member 142 in the clamping direction relative to the support pin 132.

[0105] The movable portion 156 and the clamping portion 158 are configured so that one moves toward one side (the front) of the front-back direction and the other moves toward the other side (the rear) of the front-back direction. The movable portion 176 and the clamping portion 178 are configured so that one moves toward the front and the other moves toward the rear. The first clamping member 144 and the second clamping member 164 are described in detail below. The clamping member (particularly the clamping member) is part of the tool holding portion 100.

[0106] (First clamping member) Figure 10 As shown, the first clamping member 144 is provided with an insertion portion 146 , an extension portion 148 , a leg portion 152 , a protrusion 154 , a movable portion 156 , and a clamping portion 158 .

[0107] ((Insert portion)) The insert portion 146 constitutes the center portion in the vertical direction of the first clamping member 144. A circular insert hole 146A is formed in the insert portion 146 and passes through in the left-right direction. The support pin 132 ( Figure 9 A contact surface 147 is formed at the left end portion of the insertion portion 146 and the left end portion of the movable portion 156. The contact surface 147 is formed in a flat surface shape along the up-down direction and the front-back direction.

[0108] ((Extended Portion)) Extended portion 148 extends leftward from contact surface 147. An upper surface 148A is formed at the upper end of extended portion 148. Curved surface 149 is formed at the front end of insertion portion 146 and the front end of extended portion 148. Curved surface 149 is formed in an arc shape when viewed from the left and right directions.

[0109] ((Leg)) Leg 152 extends downward from the lower end of insertion portion 146 and the lower end of extension portion 148. Opposing surfaces 153 are formed at the rear ends of leg 152 and clamping portion 158. Opposing surfaces 153 are flat surfaces extending in both the vertical and horizontal directions.

[0110] ((Protrusion)) The protrusion 154 protrudes to the left from the front end of the contact surface 147. The protrusion 154 is formed in a square column shape extending in the left-right direction. In addition, the protrusion 154 contacts the movable part 176 to restrict the second clamping member 164 ( Figure 11 ) Rotation toward the front.

[0111] ((Movable portion)) The movable portion 156 is provided on the other side (upper side) of the first clamping member 144 in the clamping direction relative to the support pin 132. The movable portion 156 is secured by an O-ring 136 ( Figure 9 ) applies force. The movable portion 156 extends forward and upward (diagonally upward) from the upper end of the insertion portion 146. A link hole 157 is formed (provided) in the movable portion 156 and extends therethrough in the left-right direction. The link hole 157 is an example of a link portion extending in a direction intersecting the clamping direction.

[0112] The connecting rod hole 157 has a long hole portion 157A located on the front side (upper side) and a widened portion 157B located on the rear side (lower side). The long hole portion 157A and the widened portion 157B are formed as a whole and are continuous as a hole. When viewed from the left and right directions, the long hole portion 157A is a portion where the width of the hole is approximately the same at each position toward the upper side. In addition, the width of the long hole portion 157A is slightly larger than the diameter of the guide pin 124. Therefore, when the guide pin 124 is located in the long hole portion 157A, the movement of the movable portion 156 is restricted by the guide pin 124. The widened portion 157B is a portion with a trapezoidal shape in which the width of the hole gradually increases toward the lower side. In addition, the lower surface of the widened portion 157B is continuous with the lower surface of the long hole portion 157A and is inclined at the same angle, while the upper surface is at a different angle from the upper surface of the long hole portion 157A. Specifically, the upper surface of the widening portion 157B is configured to have an obtuse angle relative to the vertical direction than the upper surface of the long hole portion 157A (forms an obtuse angle). By configuring in this way, the width of the widening portion 157B is larger than the long hole portion 157A. Therefore, the width of the widening portion 157B is larger than the diameter of the guide pin 124. It is configured so that a gap is generated between the widening portion 157B and the guide pin 124. When the guide pin 124 is located in the widening portion 157B, the restriction of the guide pin 124 on the movement of the movable portion 156 becomes weaker than when the guide pin 124 is located in the long hole portion 157A. The gap between the widening portion 157B and the guide pin 124 is configured to be larger than one-fifth of the radius of the guide pin 124.

[0113] (Clamping portion) The clamping portion 158 extends downward and forward from the lower end portion of the support leg portion 152. The clamping portion 158 is provided on one side (lower side) of the first clamping member 144 relative to the clamping direction of the support pin 132. The clamping portion 158 is formed in a roughly semicircular shape when viewed from below. The clamping portion 158 protrudes forward from the lower end portion of the support leg portion 152, and the insertion portion 146 protrudes forward from the upper end portion of the support leg portion 152, thereby forming a U-shaped groove portion 161. As an example, the clamping portion 158 has a bottom surface 158A, a tapered surface 158B, a side surface 158C, a retaining surface 158D, and an opposing surface 153.

[0114] Bottom surface 158A is formed into a flat surface along the front-back direction and the left-right direction. Tapered surface 158B is an example of a tapered portion and extends obliquely upward from the outer periphery of bottom surface 158A. In other words, tapered surface 158B is along an inclined direction intersecting the clamping direction.

[0115] The side surface 158C extends upward from the upper end of the tapered surface 158B. The holding surface 158D extends from the upper end of the side surface 158C toward the outer peripheral surface of the leg portion 152. The holding surface 158D extends obliquely downward in such a manner that the front end is located lower than the rear end. In addition, the holding surface 158D is formed into a flat surface. Therefore, when the holding surface 158D is arranged in the front-back direction and the left-right direction (horizontal direction), the holding surface 158D can hold the front end tool 16 ( Figure 1 ) In addition, the thickness and the like may differ depending on the type of the tip tool, and the holding surface 158D may not necessarily be horizontal when the tip tool is held.

[0116] (Second clamping member) Figure 11 As shown, the second clamping member 164 is provided with an insertion portion 166, an extension portion 168, a leg portion 172, a protrusion 174, a movable portion 176, and a clamping portion 178. In addition, as an example, the second clamping member 164 has a Figure 10 ) of the same shape and size. In other words, the second clamping member 164 is the same structure as the first clamping member 144 rotated 180 degrees around the axis in the vertical direction. In addition, the first clamping member 144 and the second clamping member 164 are relative to the support pin 132 ( Figure 9 ) are configured differently in the front-to-back direction, so different symbols are used to distinguish them.

[0117] ((Insert portion)) The insert portion 166 constitutes the center portion in the vertical direction of the second clamping member 164. A circular insert hole 166A is formed in the insert portion 166 and passes through in the left-right direction. The support pin 132 ( Figure 9 ). A contact surface 167 is formed at the right end of the insertion portion 166 and the right end of the movable portion 176. The contact surface 167 is formed into a flat surface along the up-down direction and the front-back direction. The contact surface 167 and the contact surface 147 ( Figure 10 ) in the left-right direction.

[0118] ((Extended Portion)) Extending portion 168 extends rightward from contact surface 167. An upper surface 168A is formed at the upper end of extending portion 168. Curved surface 169 is formed at the front end of insertion portion 166 and the front end of extending portion 168. Curved surface 169 is formed in an arc shape when viewed from the left and right directions.

[0119] ((Supporting leg portion)) The supporting leg portion 172 extends downward from the lower end portion of the insertion portion 166 and the lower end portion of the extension portion 168. An opposing surface 173 is formed at the rear end portion of the supporting leg portion 172 and the rear end portion of the clamping portion 178. The opposing surface 173 is formed into a flat surface along the vertical direction and the horizontal direction. The opposing surface 173 is configured to be able to contact the opposing surface 153 ( Figure 10 ) are opposite or in contact in the front-to-back direction.

[0120] ((Protrusion)) The protrusion 174 protrudes to the right from the rear end of the contact surface 167. The protrusion 174 is formed in a square column shape extending in the left-right direction. The protrusion 174 contacts the movable portion 156 to restrict the first clamping member 144 ( Figure 10 ) Rotation to the rear.

[0121] ((Movable portion)) The movable portion 176 is provided on the other side (upper side) of the second clamping member 164 in the clamping direction relative to the support pin 132. The movable portion 176 is secured by an O-ring 136 ( Figure 9 ) applies force. The movable portion 176 extends rearward and upward (diagonally upward) from the upper end of the insertion portion 166. A connecting rod hole 177 is formed (provided) in the movable portion 176 and extends in the left-right direction. The connecting rod hole 177 is an example of a connecting rod portion extending in a direction intersecting the clamping direction.

[0122] In the connecting rod hole 177, the long hole portion 177A located on the rear side and the widened portion 177B located on the front side are formed as a whole. When viewed from the left and right directions, the long hole portion 177A is a portion where the width of the hole is approximately the same at all positions toward the upper side. The widened portion 177B is a portion of the hole that has a trapezoidal shape, with the width gradually widening toward the lower side. In addition, the relationship between the diameter of the guide pin 124 and the widths of the long hole portion 177A and the widened portion 177B is the same as that of the first clamping member 144. That is, when the guide pin 124 is located in the widened portion 177B, the restriction on the movement of the movable portion 176 by the guide pin 124 is weakened, just as when the guide pin 124 is located in the long hole portion 177A.

[0123] (Clamping portion) The clamping portion 178 extends downward and rearward from the lower end portion of the support leg portion 172. The clamping portion 178 is provided on one side (lower side) of the second clamping member 164 relative to the clamping direction of the support pin 132. The clamping portion 178 is formed in a roughly semicircular shape when viewed from below. The clamping portion 178 protrudes rearward from the lower end portion of the support leg portion 172, and the insertion portion 166 protrudes rearward from the upper end portion of the support leg portion 172, thereby forming a U-shaped groove portion 181. As an example, the clamping portion 178 has a bottom surface 178A, a tapered surface 178B, a side surface 178C, a retaining surface 178D, and an opposing surface 173.

[0124] Bottom surface 178A is formed into a flat surface along the front-back direction and the left-right direction. Tapered surface 178B is an example of a tapered portion and extends obliquely upward from the outer periphery of bottom surface 178A. In other words, tapered surface 178B is along an inclined direction intersecting the clamping direction.

[0125] Side surface 178C extends upward from the upper end of tapered surface 178B. Retaining surface 178D extends from the upper end of side surface 178C toward the outer peripheral surface of leg portion 172. Retaining surface 178D extends obliquely downward so that the rear end is located below the front end. Furthermore, retaining surface 178D is formed into a flat surface. Therefore, when retaining surface 178D is arranged in a horizontal direction, retaining surface 178D can retain front end tool 16 from below. Furthermore, retaining surface 178D does not necessarily need to be horizontal, similar to retaining surface 158D.

[0126] like Figure 9 As shown, the clamping portions 158 and 178 are mounted on the clamping bracket 126 (tool holding portion 100) so that they can rotate (open and close) to different sides in the front-to-back direction in response to the vertical movement of the clamping shaft 112. The clamping portions 158 and 178 are rotatably supported by the support pin 132, and the open and closed positions in the front-to-back direction are switched by the rotation. The open and closed positions are described below. Thus, the clamping portions 158 and 178 are mounted on the clamping bracket 126 so that they can move in the front-to-back direction as the first clamping member 144 and the second clamping member 164 rotate.

[0127] <Clamping shaft position and clamping part position> Figure 12 As shown, the state in which the clamping parts 158 and 178 apply force to the front end tool 16 toward the clamping bracket 126 and the unit housing 92 and the front end tool 16 is fixed is called the clamping state (fixed state) of the clamping parts 158 and 178 (clamping part 142). In addition, the position of the clamping shaft 112 (upper end face 115) in the vertical direction when the front end tool 16 is fixed is set to the first position P1. In the following description, the position of the upper end face 115 represents the position of the clamping shaft 112 in the vertical direction. In addition, although the clamping shaft 112 is a component that moves in the vertical direction, if the position of the clamping shaft 112 is the same when the front end tool 16 is held and when the front end tool 16 is not held, there is a concern that the clamping force cannot be correctly applied to the front end tool 16, so the first position P1 may not be the uppermost position of the clamping shaft 112. Specifically, the first position P1 may also be a position slightly lower than the uppermost position of the clamping shaft 112. Furthermore, in this case, the upward movement of the clamp shaft 112 located at the uppermost position may be restricted by the pusher 64 or by the inner portion of the unit case 92 .

[0128] When the clamping shaft 112 is at the first position P1, the clamping portions 158 and 178 (at least a portion thereof) overlap the tool tip 16 in the clamping direction (a vertical direction parallel to the clamping direction), and are in a clamped state (fixed state) (located in a fixed position) in which the tool tip 16 is biased in the clamping direction (upward). In the clamped state, the tool tip 16 is clamped in the vertical direction.

[0129] like Figure 15 As shown, the state in which the clamping parts 158 and 178 are released from applying force to the front end tool 16 is called the clamping release state of the clamping parts 158 and 178 (clamping part 142). At this time, the clamping parts 158 and 178 (clamping part 142) are located in the release position. In addition, the position of the clamping shaft 112 (upper end surface 115) in the up-down direction when it becomes the clamping release state is set to the second position P2. In addition, in the clamping release state, the entire opposing surface 153 contacts the entire opposing surface 173 in the front-to-back direction. In this way, the clamping shaft 112 moves from the first position P1 to the second position P2, so that the clamping parts 158 and 178 move in the direction (front-to-back direction) intersecting the clamping direction, and become the clamping release state (located in the release position) in which the front end tool 16 is released. Furthermore, when the clamp shaft 112 is located at the second position P2, the contact between the opposing surfaces 153 and 173, and the contact between the guide pin 124 and the lower surface of the link hole (157, 177), restrict the rotation of the first clamp member 144 and the second clamp member 164, and the clamping portions 158 and 178 are retained in the release position clamping portion 158. Thus, when the clamp shaft 112 is located at the second position P2, the clamping portions 158 and 178 move in the front-rear direction, thereby achieving a release state in which the retention of the tip tool 16 is released.

[0130] like Figure 14 、 Figure 16 as well as Figure 17As shown, the state in which the clamping portions 158 and 178 are able to move in the front-to-back direction is referred to as the temporary holding state of the clamping portions 158 and 178. In the temporary holding state, even when the operating force is released, the clamping handle 62 is held in the predetermined position. In this embodiment, in the temporary holding state, the clamping portions 158 and 178 each have a degree of freedom related to front-to-back movement, allowing them to apply and release force to the tip tool 16. In other words, in the temporary holding state, the clamping portions 158 and 178 can be in a state of applying or not applying force to the tip tool 16. Furthermore, the vertical position of the upper end surface 115 in the temporary holding state is referred to as a third position P3. The third position P3 is located vertically between the first position P1 and the second position P2. In other words, when the clamping handle 62 holds the clamp shaft 112 in the third position P3, the clamping portions 158 and 178 are in a temporary holding state in which they can apply and release force to the tip tool 16. Furthermore, in the temporarily held state, the upward force of the clamp spring 134 is borne by the pusher 64, so the force acting on the tip tool 16 is weaker than in the fixed state. Specifically, in the temporarily held state, the force acting on the tip tool 16 by the clamp spring 134 is zero. Furthermore, in the temporarily held state, when the tip tool 16 is pressed, causing the first clamp member 144 and the second clamp member 164 to rotate, a force (in the vertical direction) is applied to the O-ring 136 as a reaction force.

[0131] In the temporarily held state, the position where the clamping parts 158, 178 of the tip tool 16 can be attached or detached is set to the closed position. The closed position includes the release position. Furthermore, the position where the clamping parts 158, 178 hold the tip tool 16 is set to the open position. When the clamping parts 158, 178 are in the open position, the tip tool 16 is held by the clamping parts 158, 178 to a degree that prevents it from falling due to its own weight (temporarily held). Figure 14 、 Figure 16 as well as Figure 17 The illustrated position of the clamping portions 158 , 178 is where the clamping portions 158 and 178 are furthest apart in the open position.

[0132] When the clamp handle 62 holds the clamp shaft 112 at the third position P3, the clamping portions 158 and 178 are movable between the closed position and the open position. Furthermore, when the clamp shaft 112 is held at the third position P3, the degrees of freedom of the clamping portions 158 and 178 refer to the range of movement from the closed position to the open position. In other words, having degrees of freedom means having a range of movement.

[0133] like Figure 14As shown, when the clamping parts 158 and 178 are in the open position, a portion of the clamping parts 158 and 178 is located in a position aligned with (opposite to) the tip tool 16 in the clamping direction. In other words, when viewed in the vertical direction, the clamping parts 158 and 178 are located in a position overlapping with the tip tool 16. With this positional relationship, the clamping parts 158 and 178 support the tip tool 16 from below and temporarily hold it.

[0134] like Figure 15 As shown, when the clamping portions 158 and 178 are in the closed position, the clamping portions 158 and 178 are not aligned with the tip tool 16 in the clamping direction. In other words, when viewed in the vertical direction, the clamping portions 158 and 178 are not overlapped with the tip tool 16. In other words, the tip tool 16 can be detached from the clamping portions 158 and 178 (detached by its own weight).

[0135] like Figure 14 、 Figure 16 As shown, when the clamp shaft 112 is located at the third position P3 and the clamping parts 158 and 178 are located at the open position, the guide pin 124 contacts the lower surface of the link hole 157 and 177. Figure 14 、 Figure 16 In the state, the opening action (movement toward the fixed position) of the clamping parts 158 and 178 that is intended to be further opened from the open position will be restricted by the contact between the guide pin 124 and the connecting rod holes 157 and 177.

[0136] like Figure 17 As shown, in the temporary holding state, the clamping portions 158 and 178 are configured to move from an open position to a closed position by transmitting force from the tool end 16, thereby enabling attachment and detachment of the tool end 16 to the tool holding portion 100. Specifically, when a force in the clamping direction is applied to the tapered surfaces 158B and 178B, the clamping portions 158 and 178 move toward the closed position. That is, in the temporary holding state, by pressing the tool end 16 against the clamping portions 158 and 178 from below, the clamping portions 158 and 178 can be moved from the open position to the closed position.

[0137] Figure 18 The clamping shaft 112 is shown to be located at the third position P3 ( Figure 14 ) and the clamping portions 158, 178 are in the open position. In this case, the clamping portions 158, 178 temporarily retain the tip tool 16, allowing it to separate from the mounting seat 107 (in the clamping direction). In other words, the clamping portions 158, 178 are in a temporarily retaining state. Furthermore, in this case, the opening movement of the clamping portions 158, 178 is limited by the contact between the guide pin 124 and the link holes 157, 177.

[0138] The clamping state of the clamping parts 158 and 178 means that the clamping parts 158 and 178 are located at the fixed position when the tip tool 16 is fixed to the clamp shaft 112. The clamping parts 158 and 178 are located at the released position when the clamping parts 158 and 178 are located at the released position.

[0139] The clamping portions 158 , 178 being in the temporary holding state refers to a temporary holding position in which the clamping portions 158 , 178 are located further inward in the front-rear direction than the fixed position and the tip tool 16 can be changed in position about the clamping shaft 112 .

[0140] The temporary holding position includes the above-mentioned closed position and open position. In this way, the clamping parts 158 and 178 are provided so as to be rotatable and movable toward the fixed position, the closed position, and the temporary holding position.

[0141] The tool holding portion 100 includes a support pin 132 extending in an axial direction intersecting both the clamping direction and a direction intersecting the clamping direction, and a clamping member 142 rotatable about the support pin 132. The tool holding portion 100 applies a clamping force in the clamping direction to the tip tool 16, thereby holding the tip tool 16.

[0142] The tool holding portion 100 can be in either a fixed state or a temporarily held state. The fixed state of the tool holding portion 100 refers to a state in which the clamping portions 158 and 178 are in a fixed position, applying a clamping force to the tool end 16, thereby securing the tool end 16 to the tool holding portion 100. The temporarily held state of the tool holding portion 100 refers to a state in which the clamping portions 158 and 178 are located at a position different from the fixed position, and the clamping force applied to the tool end 16 is weaker than when the clamping portions 158 and 178 are in the fixed position.

[0143] When the tool holding portion 100 is in the temporary holding state, the clamping portions 158 and 178 are configured to be able to change positions between an open position and a closed position. When in the open position, they can move to the closed position in response to the force applied to the tool end 16. The open position of the clamping portions 158 and 178 is a position in which the tool holding portion 100 can hold the tool end 16. The closed position of the clamping portions 158 and 178 is a position in which the tool end 16 can be attached to or detached from the tool holding portion 100.

[0144] Figure 19The approximate positions of the clamping parts 158 and 178 in the clamping direction relative to the hole part 24 of the front end tool 16 are shown. There are four types of positions. The positions of the clamping parts 158 and 178 in the state where the clamping parts 158 and 178 are closest to each other in the front-back direction (released state) are shown by solid lines. In addition, the positions of the clamping parts 158 and 178 in the temporary holding state and open position are shown by single-point dashed lines. In addition, the positions of the clamping parts 158 and 178 in the fixed state are shown by dotted lines. In addition, the positions of the clamping parts 158 and 178 in the inward movement from the temporary holding state and open position are shown by dotted lines. In addition, the outer edges of the clamping parts 158 and 178 become approximately the same position as the inner surface of the insertion part 25 (slightly closer to the inside than the inner surface of the insertion part 25), and the clamping parts 158 and 178 can pass through the insertion part 25 to the maximum extent. In addition, Figure 19 The illustrated clamping portions 158 , 178 only show the locations of the bottom surfaces 158A, 178A and the tapered surfaces 158B, 178B. Figure 19 The front end of the clamping portion 158 is shown as being at the same position as the front end of the holding surface 158D. Similarly, the rear end of the clamping portion 178 is shown as being at the same position as the rear end of the holding surface 178D. Furthermore, the lines showing the positions of the clamping portions 158 and 178 are schematic and do not accurately represent the outer shapes.

[0145] Although Figures 12 to 18 Although not shown, when the front end tool 16 is pressed against the clamping parts 158 and 178 from below in the temporary holding state, the clamping parts 158 and 178 are basically configured not to move to the release position. Figure 19 When the front end tool 16 is pressed against the conical surfaces 158B and 178B of the clamping parts 158 and 178 located at the single-dot dashed line (temporarily maintaining the open position), the clamping parts 158 and 178 move inward to the position of the dotted line instead of the position of the solid line. This is because, when the front end tool 16 is pressed against the clamping parts 158 and 178 from below, the position of the dotted line becomes a position where the clamping parts 158 and 178 do not overlap with the front end tool 16 in the clamping direction, and at this step, the clamping parts 158 and 178 pass through the hole 24. The dotted line position is also one of the closed positions of the present invention. For example, Figure 17As shown, the fact that the clamping portions 158 and 178 can pass through the hole portion 24 at the position of the dotted line is clear from the fact that the inner diameter of the hole portion 24 is larger than the outer diameter of the clamping portions 158 and 178 at the release position. In addition, in the case of this embodiment, the clamping portions 158 and 178 can be moved to the release position even in the temporary holding state. This is based on the size of the width of the widening portions 157B and 177B. Conversely, by adjusting the size of the widening portions 157B and 177B, the range of movement of the clamping portions 158 and 178 in the temporary holding state can also be adjusted. For example, the angle of the upper surface portion of the widening portions 157B and 177B can be made close to the long hole portions 157A and 177A, so that the clamping portions 158 and 178 in the temporary holding state cannot be moved to the release position.

[0146] [Function of the first embodiment] See Figures 12 to 18 , the attachment and detachment operation of the tip tool 16 in the electric tool 10 will be described. Figures 12 to 18 In FIG. 1 , the state of the portion of the drive mechanism 80 related to the attachment and detachment of the tip tool 16 is simplified as viewed from the right side in the left-right direction. Figures 1 to 11 , omitting the records of individual figure numbers.

[0147] like Figure 12 As shown, when the clamping handle 62 is located in the front-to-back direction, the first plane 72 is located in the front-to-back direction, and the clamping portions 158 and 178 are in a clamped state. Figure 12 In the figure, the clamping handle 62 (and the pusher 64) are in their initial positions. Furthermore, a line passing through the center of the pin 46 and along the first plane 72 is indicated by a dashed line as line K. Line K represents the position of the clamping handle 62 relative to the horizontal plane. In the clamped state, the upper end surface 115 is located at a first position P1 in the vertical direction. Furthermore, line K is located at an angle θA relative to the front-back direction (horizontal plane). Angle θA = 0°.

[0148] In the clamped state, the tip tool 16 is fixed. Therefore, when the motor 52 is driven in the clamped state, the swing arm 88 swings and the clamp shaft 112 swings, so that the tip tool 16 vibrates.

[0149] Furthermore, in the clamped state, the first plane 72 and the upper end surface 115 are opposed to each other with a gap d1 in the vertical direction. That is, the pusher 64 is separated from the clamping shaft 112. The movable parts 156 and 176 are lifted upward by the guide pin 124 and approach each other in the front-to-back direction. In other words, when viewed from the left and right directions, at least a portion of the movable parts 156 and 176 overlap in the front-to-back direction. At this time, the movable parts 156 and 176 are separated from the O-ring 136. The opposing surface 173 is located at a position (rear side position) that forms an angle θ1 with respect to the reference plane M passing through the center of the support pin 132 and along the vertical direction. The opposing surface 153 is located at a position (front side position) that is symmetrical to the position of the opposing surface 173 in the front-to-back direction.

[0150] like Figure 13 As shown, when the clamping handle 62 begins to rotate toward the front, the rear end of the curved surface 73 comes into contact with the upper end surface 115. The clamping shaft 112 moves to a position PA below the first position P1 due to the pressing force applied by the curved surface 73. Furthermore, the vertical distance between the first position P1 and position PA is d2. The guide pin 124 descends along with the clamping shaft 112, and the guide pin 124 contacts the lower surfaces of the connecting rod holes 157 and 177, respectively, causing the movable portions 156 and 176 to receive downward pressing force from the guide pin 124. As a result, the movable portions 156 and 176 begin to rotate toward the side that separates from each other in the front-to-back direction. More specifically, the first clamping member 144 and the second clamping member 164 rotate about the support pin 132, causing the movable portions 156 and 176 to separate from each other in the front-to-back direction. At this point, line K is located at an angle θB (>θA) relative to the horizontal plane. The facing surface 173 is located at an angle θ2 (<θ1) relative to the reference plane M. The movement (rotation) of the movable portions 156 and 176 relative to the descent of the guide pin 124 depends on the inclination angle of the lower surfaces of the link holes 157 and 177 .

[0151] like Figure 14 As shown, when the clamp handle 62 is further rotated toward the front side, the second plane 74 contacts the upper end surface 115. The clamp shaft 112 moves to the position PA ( Figure 13 ) is a third position P3 on the lower side. In addition, the vertical distance between the first position P1 and the third position P3 is d3 (> d2).

[0152] The movable parts 156 and 176 (the lower surface of the connecting rod hole 157 and the connecting rod hole 177) receive a pressing force from the guide pin 124, so that the movable parts 156 and 176 move from Figure 13The state is further moved to the side that is separated from each other in the front and rear directions. As a result, the movable parts 156 and 176 are in contact with the O-ring 136. In addition, this state becomes a temporary holding state in which the top ends of the clamping parts 158 and 178 can contact and separate from the peripheral edge of the hole part 24 in the up and down directions. If the direction in which gravity acts is downward, due to the weight of the front end tool 16, the top ends of the clamping parts 158 and 178 are in contact with the peripheral edge of the hole part 24 in the up and down directions. At this time, the line K is located at a position that forms an angle θC (>θB) with respect to the horizontal plane. The opposing surface 173 is located at a position that forms an angle θ3 (<θ2) with respect to the reference plane M.

[0153] In the temporary holding state, guide pin 124 is located in widened portions 157B and 177B, and the guide pin 124's restriction on the movement (rotation) of first clamping member 144 and second clamping member 164 is weakened. Therefore, in the temporary holding state, clamping members 158 and 178 have freedom of rotation (opening and closing). In other words, while being biased by O-ring 136, clamping members 158 and 178 are able to move within a range from a position where guide pin 124 abuts the lower surface of connecting rod holes 157 and 177 (a position included in the open position) to a position where guide pin 124 abuts the upper surface of connecting rod holes 157 and 177 (a position included in the closed position). Therefore, clamping members 158 and 178 move toward the closed position when pressed by the peripheral edge of hole 24, and move toward the open position when not pressed by the peripheral edge of hole 24. Thus, in the temporarily held state, the tip tool 16 can be attached to (temporarily held) and detached from the clamping portions 158 and 178 .

[0154] like Figure 15 As shown, when the clamping handle 62 is further rotated toward the front side, the front portion of the second plane 74 contacts the front portion of the upper end surface 115. As a result, the clamping shaft 112 is moved to a position greater than the third position P3 ( Figure 14 ) The second position P2 on the lower side. In addition, the vertical distance between the first position P1 and the second position P2 is d4 (> d3).

[0155] The movable parts 156 and 176 receive a pressing force from the guide pin 124, causing the movable parts 156 and 176 to further rotate toward the side away from each other in the front-to-back direction. At this time, the line K is located at a position forming an angle θD (>θC) relative to the horizontal plane. The opposing surface 173 is located at a position forming an angle θ4 = 0° relative to the reference plane M. In other words, the entire opposing surface 173 is in contact with the entire opposing surface 153 in the front-to-back direction. The entire opposing surface 153 is in contact with the entire opposing surface 173, resulting in a released state. In the released state, the clamping parts 158 and 178 are in the released position, and the front end tool 16 is detached from the clamping parts 158 and 178. In the released state, since there is no component supporting the front end tool 16 from below, the front end tool 16 is detached from the tool holding part 100 (clamping part) due to its own weight. Therefore, the front end tool 16 can be detached from the tool holding part 100 simply by operating the clamping handle 62.

[0156] Here, the clamping spring 134 exerts a pressing force on the clamping shaft 112, and a force F is exerted on the pusher 64 obliquely upward from the upper end surface 115. The force F acts as a -R direction ( Figure 5 )'s rotational force plays a role. As a result, the clamping handle 62 rotates in a manner returning to the rear side.

[0157] like Figure 16 As shown, the clamping handle 62 rotates to the rear side, and the second plane 74 and the upper end surface 115 are in surface contact. In this state, since the center of the pin 46 is located in the direction of the force acting on the second plane 74 from the upper end surface 115, the clamping handle 62 is difficult to rotate to the rear side. Figure 14 The temporary hold state is maintained in the same manner.

[0158] like Figure 17 As shown, in the temporary holding state, the front end tool 16 can be assembled (temporarily held) and detached from the clamping parts 158 and 178. In the state where the front end tool 16 is temporarily held, the clamping handle 62 is rotated rearward to fix the state where the front end tool 16 is held ( Figure 12 ).

[0159] like Figure 18 As shown, in the temporary holding state, a gap h is generated between the inclined surface 108 and the outer peripheral portion 21A in the vertical direction. In this way, the outer peripheral portion 21A and the mounting seat 107 can be in a non-contact state (a state without engagement in the rotational direction), so that the position of the tip tool 16 can be adjusted in the swing direction ( Figure 1The position of the clamping parts 158 and 178 can be freely changed in the direction indicated by the arrow RW in the middle. After adjusting the position in the swing direction, the clamping parts 158 and 178 are in the clamped state described above, thereby fixing the tip tool 16. In this way, the fixed state and the released state of the clamping parts can be switched simply by operating the clamping handle 62.

[0160] And, as Figure 19 The clamping portions 158 and 178 in the temporarily held state are configured to be able to pass through the hole 24 of the tip tool 16 even without moving to the released position. This can prevent problems caused by manufacturing errors. Furthermore, multiple tip tools with different hole 24 sizes can be assembled (temporarily held). In this embodiment, the configuration is such that at least three tip tools with different hole 24 (insertion portion 25) diameters can be assembled (temporarily held).

[0161] As described above, in the power tool 10, when the clamping handle 62 holds the clamping shaft 112 in the third position P3, the clamping portions 158 and 178 are in a temporarily held state with the freedom to move in the front-to-back direction. Thus, when the clamping portions 158 and 178 are pressed against the tip tool 16 from above, even with a low pressing force, the clamping portions 158 and 178 can move from the open position to the closed position, and then from the closed position to the open position, thereby temporarily holding the tip tool 16. Furthermore, because the clamping portions 158 and 178 have the aforementioned freedom, the tip tool 16 in the temporarily held state can be removed from the clamping portions 158 and 178 even without the application of a large tensile force. This facilitates assembly and disassembly of the tip tool 16 in the power tool 10, thereby improving operability.

[0162] In the power tool 10, the tip tool 16 can be installed with fewer operations, which can improve operability. For example, if the tip tool 16 is to be replaced after work, the tip tool can be removed by rotating the clamping handle 62 to release the clamp. Furthermore, the replacement tip tool 16 is placed on the workbench. If the clamping parts 158 and 178 are brought into contact with the tip tool 16, a temporary holding state is achieved. Therefore, the tip tool 16 can be assembled by rotating the clamping handle 62. In this way, the tip tool 16 can be attached and detached using two operations: lifting and lowering the clamping handle 62, thereby improving operability.

[0163] In the electric tool 10 , the clamping portions 158 , 178 have the above-mentioned degree of freedom and do not overlap with the tool tip 16 in the clamping direction when in the closed position, so that the tool tip 16 can be easily assembled.

[0164] In the power tool 10, the clamping parts 158 and 178 are positioned in the closed position by bringing the tool tip 16 into contact with the clamping parts 158 and 178. This allows the clamping parts 158 and 178 to be moved by the force from the tool tip 16, thereby improving operability.

[0165] In the power tool 10, the O-ring 136 applies force to the movable portions 156 and 176 toward the sides that are closer to each other in the front-rear direction, causing the clamping portions 158 and 178 to move toward the open position. In other words, the clamping portions 158 and 178, which have been closed by contact with the tool tip 16, can be returned to the open position without any special operation, making it easy to temporarily hold the tool tip 16.

[0166] In the power tool 10, even when the clamping portions 158 and 178 are in the open position, the O-ring 136 continues to exert an urging force on the movable portions 156 and 176. Therefore, when the clamping handle 62 is operated to secure the tool tip 16, the clamping portions 158 and 178 can be smoothly moved from the open position to the clamped position.

[0167] In the power tool 10, the clamping parts 158 and 178 are switched between the open and closed positions by rotating about the support pin 132. Therefore, compared with a structure in which the clamping parts 158 and 178 slide in the front-back direction, the space required for the operation of the clamping parts 158 and 178 in the front-back direction can be reduced.

[0168] In the power tool 10, the clamping portions 158 and 178 are located below the support pin 132, while the movable portions 156 and 176 are located above the support pin 132. Furthermore, the O-ring 136 applies force to the movable portions 156 and 176. This eliminates the need for the O-ring 136 to directly apply force to the clamping portions 158 and 178, thereby preventing the O-ring 136 from interfering with the movement of the tool tip 16 when the clamping portions 158 and 178 are holding it.

[0169] In the electric power tool 10 , since the O-ring 136 is disposed inside the unit case 92 , it is possible to suppress degradation of the O-ring 136 due to contact with other components or adhesion of moisture.

[0170] In the power tool 10, the O-ring 136 applies force to both the movable parts 156 and 176. This eliminates the situation where, for example, the first clamping member 144 is fixed in position while only the second clamping member 164 rotates. This prevents the progression of wear and other deterioration caused by rotation of only one of the first and second clamping members 144, 164. Furthermore, the first and second clamping members 144, 164 can be properly maintained in the open position. Furthermore, since a single O-ring 136 applies force to the movable parts 156 and 176, there is no need for multiple force-applying members.

[0171] In the power tool 10, the outer diameter of the portion of the clamping portion 158, 178 provided with the tapered surface 158B, 178B continuously decreases as it moves downward. As a result, a force in the upward direction is applied to the tapered surface 158B, 178B from the front end tool 16, so that the clamping portion 158, 178 easily moves inward due to the component force. As a result, the clamping portion 158, 178 easily passes through the hole portion 24 of the front end tool 16. In addition, the holding surfaces 158D, 178D in the temporary holding state are also similarly inclined relative to the clamping direction (up and down direction), and the outer diameter gradually increases as it moves downward. Therefore, when a force is applied to the front end tool 16 in the temporary holding state in the downward direction, the clamping portion 158, 178 appropriately moves inward due to the inclination of the holding surfaces 158D, 178D, and the front end tool 16 can be easily removed.

[0172] In the power tool 10, the clamping portions 158 and 178 hold the tip tool 16 in a manner such that the tip tool 16 can be separated from the mounting base 107. Specifically, while the clamping member 142 remains in the open position (the clamping portions 158 and 178 remain stationary), the tip tool 16 can be separated from the unit housing 92 and the clamping bracket 126. This allows the operator to change the direction of the tip tool 16 while holding the clamping member 142. This eliminates the need to disassemble the tip tool 16 each time the direction of the tip tool 16 is changed, improving operability.

[0173] In the power tool 10, when the clamping portions 158 and 178 are in the open position, the guide pin 124 contacts a portion of the lower wall (lower surface) of the link hole 157 and 177. Thus, when the clamping handle 62 is not being operated, the clamping portions 158 and 178 in the open position are restricted from further opening, thereby preventing difficulty in attaching the tip tool 16 to the clamping portions 158 and 178.

[0174] In the power tool 10, when the clamping portions 158 and 178 are in the released state, when the operating force acting on the clamping handle 62 is released, the clamping portions 158 and 178 are transferred to a temporary holding state due to the action of the outer portion 65 of the pusher 64 and the action of the O-ring 136. In other words, since the clamping portions 158 and 178 can be automatically transferred from the released state to the temporary holding state, the operability is good. Furthermore, although the clamping portions 158 and 178 are transferred to the temporary holding state, they are not transferred to the clamping state. Therefore, if foreign matter invades between the front end tool 16 and the clamping portions 158 and 178, it is possible to prevent the clamping portions 158 and 178 from being damaged by the clamping state.

[0175] [Modifications of the First Embodiment] The present invention is not limited to the above-described first embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0176] use Figures 20 to 22 A modification of the first embodiment will be described. Figure 20 Shows a fixed state, Figure 21 Shows a temporary hold state (open position), Figure 22 A modified example of the release state is shown. Figures 20 to 22 The symbols recorded in the embodiment are based on the symbols of the structures corresponding to the above-mentioned embodiments plus 200 (for example, the unit housing of the modified embodiment is 292). In addition, in the modified embodiment, the main change is the shape of the clamping parts (first clamping part 144, second clamping part 164). Therefore, the following mainly describes only the changes, and the description of the structures with the same functions is omitted. And, Figures 20 to 22 The first clamping member is omitted from the illustration.

[0177] In the modified example, the shape of the link hole 357 of the clamp member is different from that of the above-described embodiment. In addition, a protrusion 376A is provided on the movable portion 376 of the clamp member. Figure 20 A modified example of the fixed state is shown. (A portion of) the guide pin 324 is located within the elongated hole 357A. In this state, the clamp spring 334 biases the flange 318 upward, thereby biasing both the guide pin 324 and the clamp shaft 312 upward. As a result, the guide pin 324 presses against the elongated hole 357A, causing the second clamping member 364 to rotate clockwise, and the clamping member 378 to press against the tip tool 16 from the bottom. This vertically clamps the tip tool 16 and secures it to the tool holder 300.

[0178] like Figures 20 to 22As shown, in the connecting rod hole 357, the lower surface of the widened portion 357B is inclined at a different angle than the elongated hole portion 357A. Specifically, the lower surface of the widened portion 357B is inclined more steeply relative to the clamping direction (vertical direction) than the lower surface of the elongated hole portion 357A. In other words, the lower surface of the widened portion 357B forms an acute angle relative to the vertical direction compared to the lower surface of the elongated hole portion 357A.

[0179] Here, the lower surface of the link hole 357 is the portion that contacts the guide pin 324 when the second clamping member 364 is rotated from the fixed position to the temporarily retained position (or released position). Depending on the angle of inclination, the amount of rotation of the second clamping member 364 relative to the movement of the guide pin 324 varies. In the present invention, to achieve proper attachment and detachment of the tip tool, the clamping member in the temporarily retained position must be positioned so that the tapered portion of the clamping member contacts the edge (upper edge) of the hole in the pre-attached tip tool 16, and the retaining surface of the clamping member contacts the edge (lower edge) of the hole in the temporarily retained tip tool 16. Therefore, if there is a discrepancy in the amount of rotation of the clamping member relative to the amount of operation of the clamp handle (the movement of the guide pin), there is a risk of interference with the operation.

[0180] Therefore, in this modified example, compared to the aforementioned embodiment, a portion of the lower surface of the connecting rod hole 357 (particularly the lower surface of the widened portion 357B corresponding to the temporary holding state) is angled at an acute angle relative to the vertical direction. This allows the clamping member to rotate less at this acute angle when transitioning from the fixed state to the temporary holding state than in the aforementioned embodiment. This reduces the impact of dimensional deviations on the clamping member's rotation, for example. Consequently, achieving the desired clamping member rotation can be achieved without requiring high machining precision.

[0181] Furthermore, in a modified example, a protrusion 376A is provided on the movable portion 376 of the clamping member. Figure 21 、 Figure 22 As shown, in the temporary holding state or the released state, at least a portion of the O-ring 336 moves outward (front and back direction) from the recessed portion 331, but the movement of a portion of the O-ring 336 in the up and down directions after movement is restricted by the protrusion 376A, so that the O-ring 336 can continue to be maintained in the predetermined position.

[0182] [Structure of the Second Embodiment] An electric tool 400 as a working machine according to the second embodiment will be described. Figure 1) are identical or similar structures, and the same reference numerals are used, and description thereof is omitted. The power tool 400 differs from the power tool 10 of the first embodiment in that the tool tip is held differently in the temporarily held state. The rotation of the tool tip (particularly rotation due to its own weight) is suppressed, and force is applied to the tool tip to change the rotational position. Details are described below.

[0183] 〈Power Tool Overview〉 Figure 23 The output shaft 414 and the clamping handle 62 of the power tool 400 are shown. In addition, in order to clearly show the shape of each part, the hatching is omitted. The power tool 400 is different from the power tool 10 ( Figure 4 ) is different from the driving mechanism 80 ( Figure 4 ) of the output shaft portion 90 ( Figure 4 ) and has an output shaft portion 414 and a structure using the tip tool 402. The structure other than the output shaft portion 414 is the same as that of the electric tool 10, and therefore illustration and description thereof are omitted.

[0184] Front-end tools Figure 25 The front end tool 402 shown is a member extending in the front-back direction and has a front flat plate portion 403 and a rear mounting portion 404. A blade portion (not shown) is formed at the front end of the flat plate portion 403.

[0185] Mounting portion 404 includes a plate portion 405 and a protruding portion 406. Protruding portion 406 protrudes upward from the upper surface of plate portion 405. When viewed from above, outer peripheral portion 406A of protruding portion 406 has a shape in which a plurality of concave portions 406B and a plurality of convex portions 406C are alternately arranged in the circumferential direction. Furthermore, outer peripheral portion 406A is provided with an inclined surface 407A and a curved surface 407B.

[0186] like Figure 24 As shown, the inclined surface 407A is a surface along an inclined direction intersecting the vertical direction. The curved surface 407B is located above the inclined surface 407A. The inclined surface 407A is an example of an inclined portion.

[0187] like Figure 25 As shown, an upper wall 408 is formed at the upper end of the protrusion 406. The upper wall 408 is formed in a plate shape having thickness in the vertical direction. A hole portion 409 is formed in the center portion of the upper wall 408 and passes through the upper wall 408 in the vertical direction. The hole portion 409 has a circular insertion portion 409A and two cutout portions 409B extending radially outward from the insertion portion 409A. The following clamping member 432 ( Figure 24 ).

[0188] 〈Details of Power Tools〉 Figure 23The power tool 400 shown has a motor 52 ( Figure 3 ), the clamp shaft 412, the clamp handle 62, and the tool holding portion 430. Furthermore, the electric power tool 400 has an output shaft portion 414.

[0189] <<Clamping Shaft>> The clamping shaft 412 is centered on the axis KA of its own axis and is driven by the motor 52 ( Figure 3 ) is an example of an output shaft for rotational drive. The clamping shaft 412 extends from the clamping bracket 126 in the up-down direction. The clamping shaft 412 is a metal component, and has a first shaft portion 412A, a second shaft portion 412B, a flange portion 412C, a support portion 412D, and a guide pin 412E. The first shaft portion 412A, the second shaft portion 412B, the flange portion 412C, and the support portion 412D are formed as a whole. The guide pin 412E is a component that is separate from the clamping shaft 412 and is fixed to the clamping shaft 412 by being pressed in. In addition, the guide pin 412E and the clamping shaft 412 can also be integrated into a single component.

[0190] The clamping shaft 412 moves between a first position P1 and a second position P2 in the vertical direction in response to the rotation of the clamping handle 62. The position of the clamping shaft 412 is shown as an example by the position of the upper end surface 413 of the clamping shaft 412. The second position P2 is located below the first position P1. Furthermore, a third position P3 exists between the first and second positions P1 and P2, serving as an intermediate position.

[0191] <<Output Shaft>> The output shaft 414 constitutes the portion of the electric tool 400 that holds the tool tip 402 and causes it to vibrate. The output shaft 414 includes a unit housing 416, a support pin 424, a clamp spring 134, and an O-ring 426. The output shaft 414 is configured to rotate (or swing) the clamp shaft 412 about the axis KA.

[0192] The unit case 416 includes a housing portion 417 , an upper wall portion 418 , a guide portion 419 , a first enlarged diameter portion 421 , and a second enlarged diameter portion 422 . The unit case 416 supports the tool holding portion 430 .

[0193] The storage portion 417 is a cylindrical portion with the vertical direction as the axial direction. A rocker arm 88 ( Figure 6 The central portion of the storage portion 417 in the vertical direction is aligned with the needle bearing 43 ( Figure 6 ) is in contact with the inner ring portion. The lower portion of the housing portion 417 is in contact with the oil seal 44 ( Figure 6 ) contact. The inner side of the storage portion 417 contains the clamping bracket 126 ( Figure 8 ).

[0194] The upper wall portion 418 covers the upper end portion of the storage portion 417. The guide portion 419 is a cylindrical portion extending upward from the upper wall portion 418. The guide portion 419 is supported by the ball bearing 42 ( Figure 6 ) is supported so as to be rotatable around a central axis along the up-down direction. A through hole 419A is formed in the upper wall portion 418 and the guide portion 419.

[0195] The first enlarged diameter portion 421 extends downward from the lower end of the housing portion 417 and expands in diameter. The second enlarged diameter portion 422 extends downward from the lower end of the first enlarged diameter portion 421 and expands in diameter. The second enlarged diameter portion 422 is provided with a mounting seat 452 described below.

[0196] The support pin 424 is an example of a support shaft extending in the left-right direction. The support pin 424 is formed in a cylindrical shape. The support pin 424 is fixed to the clamp bracket 126. Both ends of the support pin 424 in the left-right direction are supported by the first enlarged diameter portion 421.

[0197] The O-ring 426 is an example of a force-applying portion and an example of an annular elastic body. The O-ring 426 is a rubber member in the shape of an annular ring. The O-ring 426 is in contact with the movable portions 437 and 447 ( Figure 24 ) in contact, force is applied to the movable parts 437 and 447 in the radial direction inward (in the direction of approaching each other).

[0198] <<Tool Holding Portion>> The tool holding portion 430 includes the clamping portions 438 and 448 of the clamp member 432 and the mounting seat 452 of the unit case 416. The tool holding portion 430 is held by the clamp shaft 412.

[0199] (Clamping parts) Figure 24 The illustrated clamping member 432 is rotatable about the support pin 424. Specifically, the clamping member 432 includes a first clamping member 434 and a second clamping member 444, which are rotatable in opposite directions about the support pin 424. Furthermore, when describing the positions of the various parts of the first clamping member 434 and the second clamping member 444, the following description will focus on the structure of the clamping portion 438 and the clamping portion 448 in the closed position when they are in contact.

[0200] The clamping member 432 includes clamping portions 438 and 448. On the other side (upper side) of the clamping member 432 relative to the support pin 424 in the clamping direction, movable portions 437 and 447 are provided, biased by the O-ring 426. The movable portion 437 and the clamping portion 438 are configured so that as one moves forward, the other moves rearward. The movable portion 447 and the clamping portion 448 are configured so that as one moves forward, the other moves rearward.

[0201] (First Clamp Member) The first clamp member 434 is provided with an insertion portion 435 , a leg portion 436 , a movable portion 437 , and a clamp portion 438 .

[0202] The insertion portion 435 forms the vertical center portion of the first clamping member 434. A circular insertion hole 435A extending horizontally through the insertion portion 435 is formed in the insertion portion 435. The support pin 424 is inserted through the insertion hole 435A. The leg portion 436 extends downward from the lower end of the insertion portion 435.

[0203] The movable portion 437 is provided on the other side (upper side) of the first clamping member 434 relative to the support pin 424 in the clamping direction. The movable portion 437 is biased by the O-ring 426. A connecting rod hole 439 is formed in the movable portion 437, extending horizontally. The connecting rod hole 439 is an example of a connecting rod portion extending in a direction intersecting the clamping direction.

[0204] The connecting rod hole 439 has an elongated hole portion 439A located at the upper side and a widened portion 439B located at the lower side. The elongated hole portion 439A and the widened portion 439B are formed integrally. When the guide pin 412E is located in the elongated hole portion 439A, the movement of the movable portion 437 is restricted by the guide pin 412E.

[0205] The upper surface of the widened portion 439B is configured to have an obtuse inclination angle relative to the vertical direction compared to the upper surface of the elongated hole portion 439A. This configuration creates a gap between the widened portion 439B and the guide pin 412E. When the guide pin 412E is located in the widened portion 439B, the restriction on the movement of the movable portion 437 by the guide pin 412E is less severe than when the guide pin 412E is located in the elongated hole portion 439A.

[0206] The clamping portion 438 extends forward from the lower end of the leg portion 436. The clamping portion 438 is provided on one side (lower side) of the first clamping member 434 relative to the support pin 424 in the clamping direction. As an example, the clamping portion 438 includes a bottom surface 438A, a tapered surface 438B, a retaining surface 438C, and an opposing surface 438D. A protrusion 438E is provided at the lower end of the opposing surface 438D, protruding toward the rear.

[0207] The holding surface 438C is formed into a flat surface. Therefore, when the holding surface 438C is arranged along the front-back direction and the left-right direction (horizontally), the holding surface 438C can hold the tip tool 402 from the bottom. In addition, the thickness and other factors may vary depending on the type of tip tool, so the holding surface 438C is not necessarily horizontal when holding the tip tool.

[0208] (Second Clamping Member) The second clamping member 444 is provided with an insertion portion 445 , a leg portion 446 , a movable portion 447 , and a clamping portion 448 .

[0209] The insertion portion 445 forms the vertical center portion of the second clamping member 444. A circular insertion hole (not shown) extending horizontally through the insertion portion 445 is formed. The support pin 424 is inserted through the insertion hole. A leg portion 446 extends downward from the lower end of the insertion portion 445.

[0210] The movable portion 447 is provided on the other side (upper side) of the second clamping member 444 relative to the support pin 424 in the clamping direction. The movable portion 447 is biased by the O-ring 426. A connecting rod hole 449 is formed in the movable portion 447, extending therethrough in the left-right direction. The connecting rod hole 449 is an example of a connecting rod portion extending in a direction intersecting the clamping direction.

[0211] The connecting rod hole 449 has an elongated hole portion 449A located at the upper side and a widened portion 449B located at the lower side. The elongated hole portion 449A and the widened portion 449B are formed integrally. When the guide pin 412E is located in the elongated hole portion 449A, the movement of the movable portion 447 is restricted by the guide pin 412E.

[0212] The upper surface of the widened portion 449B is configured to have an obtuse inclination angle relative to the vertical direction compared to the upper surface of the elongated hole portion 449A. This configuration creates a gap between the widened portion 449B and the guide pin 412E. When the guide pin 412E is located in the widened portion 449B, the restriction on the movement of the movable portion 447 by the guide pin 412E is less than when the guide pin 412E is located in the elongated hole portion 449A.

[0213] The clamping portion 448 extends forward from the lower end of the leg portion 446. The clamping portion 448 is provided on one side (lower side) of the second clamping member 444 relative to the support pin 424 in the clamping direction. As an example, the clamping portion 448 includes a bottom surface 448A, a tapered surface 448B, a retaining surface 448C, and an opposing surface 448D. A protrusion 448E is provided at the lower end of the opposing surface 448D, protruding forward.

[0214] The holding surface 448C is formed into a flat surface. Therefore, when the holding surface 448C is arranged along the front-back direction and the left-right direction (horizontally), the holding surface 448C can hold the tip tool 402 from the bottom. In addition, the thickness and other factors may vary depending on the type of tip tool, so the holding surface 448C is not necessarily horizontal when holding the tip tool.

[0215] The clamping parts 438 and 448 are configured according to the clamping handle 62 ( Figure 23) and the vertical movement of the clamping shaft 412, and can rotate to different sides in the front-to-back direction. In other words, the clamping parts 438, 448 can move according to the movement of the clamping handle 62. The clamping parts 438, 448 are supported by the support pin 424 so as to be rotatable, and the open position and the closed position in the front-to-back direction are switched by the rotation. In this way, the clamping parts 438, 448 are arranged on the clamping bracket 126 ( Figure 23 ).

[0216] The mounting seat 452, together with the clamping portions 438 and 448, clamps the tip tool 402 in the clamping direction (vertical direction), thereby retaining the tip tool 402. The mounting seat 452 is provided on the inner circumferential surface 422A of the second enlarged diameter portion 422. The mounting seat 452 engages with the tip tool 402 in the rotational direction centered on the axis KA.

[0217] like Figure 25 As shown, in the mounting seat 452 , a plurality of recessed portions 452A and a plurality of projecting portions 452B are alternately arranged along the circumferential direction of the inner peripheral surface 422A.

[0218] like Figure 24 As shown in FIG. 4 , an inclined surface 454 is formed at the lower portion of the mounting seat 452 and at the lower portion of the inner peripheral surface 422A. In other words, in the tool holding portion 430 ( Figure 23 ) is provided with an inclined surface 454.

[0219] Inclined surface 454 is inclined so as to intersect the vertical direction. Therefore, when inclined surface 454 contacts tip tool 402, a reaction force directed diagonally downward is exerted on tip tool 402 by inclined surface 454. This reaction force exerts a force component directed radially inward and downward of output shaft 414 on tip tool 402. In other words, inclined surface 454 is an example of a reaction force generating portion.

[0220] In the tool holding portion 430 ( Figure 23 ) When the tip tool 402 is rotated about the axis KA in the first state described below, the inclined surface 454 contacts the tip tool 402, applying a force in a direction away from the mounting seat 452 (downward). When a force in the rotational direction is applied to the tip tool 402 held by the tool holding portion 430 in the first state, the inclined surface 454 contacts the tip tool 402. As a result, the inclined surface 454 applies a force in a direction away from the mounting seat 452 to the tip tool 402, resulting in the second state in which the engagement between the tip tool 402 and the mounting seat 452 in the rotational direction is released. In other words, the inclined surface 454 is also an example of an inclined portion.

[0221] The mounting seat 452 can transmit the clamping shaft 412 ( Figure 23 ) is the power in the direction of rotation as the center.

[0222] <<Status of the tool holding unit>> Figure 23 The tool holding portion 430 shown can be in either a fixed state or a temporary holding state even when the operating force on the clamp handle 62 is released.

[0223] The fixed state of the tool holding portion 430 refers to a state in which the front end tool 402 is fixed to the tool holding portion 430 by applying a force in the clamping direction to the front end tool 402. The tool holding portion 430 is configured to be able to fix the front end tool 402 at multiple rotational positions centered on the axis KA using the clamping portions 438 and 448 in the fixed state. In addition, the clamping portion 438 and the clamping portion 448 are located at the positions most separated from each other in the front-to-back direction, and the state in which the front end tool 402 is clamped by the clamping portions 438, 448 and the mounting seat 452 is equivalent to the fixed state of the front end tool 402. Since the fixed state of the front end tool 402 is different from that of the first embodiment, Figure 12 The fixing state of the tip tool 16 shown is the same, so illustration is omitted.

[0224] The temporary holding state of the tool holding portion 430 is a state in which the clamping force applied to the tip tool 402 is weaker than in the fixed state. The temporary holding state includes at least one of the first state, the second state, and the third state.

[0225] The first state in the temporary holding state refers to a state in which the rotation of the front end tool 402 due to its own weight is restricted and a state in which the front end tool 402 is restricted from being removed from the tool holding portion 430. Thus, although the temporary holding state includes a state in which the rotation of the front end tool 402 due to its own weight is restricted and a state in which the front end tool 402 is restricted from being removed from the tool holding portion 430, the restriction mentioned here does not completely prohibit its movement, but rather allows it under certain conditions. In this embodiment, even in the temporary holding state, the front end tool 402 can be rotated and removed according to the magnitude of the force applied to the front end tool 402, and the details of this are described below. The first state is a state in which the clamping member 432 (first clamping member 434, second clamping member 444) is rotated within a range of more than 10 degrees and less than 20 degrees compared to when the clamping member 432 (first clamping member 434, second clamping member 444) is in a fixed state.

[0226] The second state and the third state in the temporary holding state are states achieved by applying force to the tip tool 402 held by the tool holding portion 430 in the first state.

[0227] In the second state, the tip tool 402 can be rotated from one of the plurality of rotational positions to another rotational position while the clamping portions 438 and 448 prevent the tip tool 402 from being disengaged from the tool holding portion 430. In other words, the tool holding portion 430 in the second state, in the temporary holding state, holds the tip tool 402 rotatably.

[0228] The tool holding portion 430 in a temporarily held state is configured to hold the front end tool 402 while suppressing movement from one of a plurality of rotational positions to other rotational positions, and on the other hand, is configured to hold the front end tool 402 so as to be able to move from one of a plurality of rotational positions to other rotational positions when the force applied to the front end tool 402 in the rotational direction centered on the axis KA is greater than a predetermined value.

[0229] In the third state, the tip tool 402 is allowed to move in the direction along the axis KA (the vertical direction) while the clamping portions 438 and 448 are held by the clamping shaft 412. A force is applied to the tip tool 402 to switch between the first state and the third state, thereby enabling at least one of the tip tool 402 to be attached to or detached from the tool holding portion 430. Thus, the temporary holding state of the tool holding portion 430 includes the second state in which the tip tool 402 can be rotated and the third state in which the tip tool 402 can be attached and detached.

[0230] In this embodiment, the temporary holding state includes at least a second state. The second state is a state in which the front end tool 402 is separated from the mounting seat 452 until the mounting seat 452 and the front end tool 402 are disengaged in the rotational direction centered on the axis KA. In other words, in the temporary holding state, the front end tool 402 and the mounting seat 452 can be separated from each other by a force applied to the front end tool 402 until the mounting seat 452 and the front end tool 402 are disengaged in the rotational direction centered on the axis KA. The second state is a state in which the clamping member 432 (first clamping member 434, second clamping member 444) has been rotated within a range of 20 degrees or more and less than 27 degrees compared to when the clamping member 432 (first clamping member 434, second clamping member 444) was fixed.

[0231] In this embodiment, the temporary holding state includes both the second state and the third state. The tool holding portion 430 restricts the removal of the tip tool 402 in the second state and applies force to the clamping portions 438 and 448 in the second state via the tip tool 402 to enter the third state.

[0232] The third state is a state in which the clamping parts 448 and 438 are moved to a position where they can pass through the hole 24 of the tip tool 402 by the force applied to the tip tool 402. In other words, in the temporary holding state, the pair of clamping parts 448 and 438 can be moved to a position where they can pass through the hole 24 of the tip tool 402. Figure 17 The state shown in the first embodiment is also the third state. The third state is a state in which the clamping member 432 (first clamping member 434, second clamping member 444) has been rotated within a range of 27 degrees to 30 degrees compared to the fixed state. Furthermore, the position of the clamping member in the state of 30 degrees rotation from the fixed state is the same as the position of the clamping member in the released state.

[0233] The tool holder 430 also has the following functions. The tool holder 430 is configured to hold the tip tool 402 in multiple rotational positions about the axis KA. Furthermore, the tool holder 430 can be in a holding state, in which the tip tool 402 is held, and a non-holding state, in which the tip tool 402 is not held. The holding state holds the tip tool 402, preventing it from rotating about the axis KA and preventing it from detaching from the tool holder 430.

[0234] Furthermore, the tool holding portion 430 can be switched from a non-holding state to a holding state, thereby holding the tool tip 402 in the tool holding portion 430, and can be switched from the holding state to a non-holding state, thereby detaching (removing) the tool tip 402 from the tool holding portion 430 by its own weight, simply by operating the clamping handle 62. The detachment by its own weight occurs primarily when the downward direction of the power tool 400 is aligned with the direction of gravity.

[0235] Furthermore, even when the operating force on the clamping handle 62 is released, the tool holding portion 430 is subjected to force via the front end tool 402, and can switch from a non-holding state to a holding state to hold the front end tool 402 in the tool holding portion 430, and can also switch from a holding state to a non-holding state.

[0236] like Figure 25 and Figure 28 As shown, the tool holding portion 430 in the fixed state can hold the tip tool 402 at a first position that is one of a plurality of rotational positions and at a second position that is adjacent to the first position in the rotational direction. Figure 25 The position of the tool holding portion 430 when the arrangement relationship is shown. The second position is, for example, Figure 28 The position of the tool holding portion 430 in the arrangement relationship shown. In addition, when the second convex portion 452B is located at a position offset by one position in the rotation direction relative to the first convex portion 452B, the second convex portion 452B is located adjacent to the first convex portion 452B.

[0237] The tool holding portion 430 in the first state is configured such that when the front end tool 402 is located at a predetermined position between the first position and the second position, if the force acting on the front end tool 402 is released, the front end tool 402 is moved to the first position or the second position by the clamping portions 438 and 448.

[0238] [Function of the second embodiment] Figure 23 As shown, in the power tool 400, when the second plane 74 is in surface contact with the upper end surface 413, the tool holding portion 430 is in a first state of temporary holding. In the first state, the operator can rotate (or swing) the tip tool 402 about the axis KA. Furthermore, in the first state, since the tool holding portion 430 temporarily holds the tip tool 402, rotation of the tip tool 402 due to its own weight and separation of the tip tool 402 from the tool holding portion 430 are restricted.

[0239] like Figure 26 As shown, the tool holder 430 utilizes the clamping portions 438 and 448 to prevent the tip tool 402 from being disengaged from the tool holder 430 while allowing the tip tool 402 to be rotated from one of the multiple rotational positions to another. The other rotational positions are not limited to positions adjacent to the one rotational position in the rotational direction and can also be positions other than the adjacent position. When the tip tool 402 is rotated, the surface contact between the second flat surface 74 and the upper end surface 413 remains unchanged.

[0240] In addition, due to the effect of gravity, the front end tool 402 is located at a position away from the mounting seat 452, but when the power tool 400 is turned upside down, the front end tool 402 is in contact with (engaged with) the mounting seat 452. In this inverted state, the front end tool 402 is in contact with the mounting seat 452, but can move in a direction away from the mounting seat 452. Therefore, if the operator applies force to the front end tool 402, the front end tool 402 can be rotated. In addition, the movement of the front end tool 402 in the upward direction (toward the mounting seat 452) is restricted by a part of the clamping part opposite to the holding surface 448C. Therefore, in the temporary holding state, the front end tool 402 and the mounting seat 452 are not in as strong contact as in the fixed state.

[0241] like Figure 27 As shown in FIG. 1 , when the tip tool 402 begins to rotate about the axis KA, the convex portion 406C contacts the convex portion 452B while the convex portion 406C moves from the concave portion 452A to the adjacent concave portion 452A. Then, as shown in cross section CC, when the inclined surface 407A contacts the inclined surface 454, a reaction force FA from the mounting seat 452 acts on the tip tool 402.

[0242] The reaction force FA is decomposed into a force component F1 directed downward and a force component F2 directed inward (on the axis KA side). The force component F2 cancels out the force component F2 acting on the opposite side of the front end tool 402. Therefore, the front end tool 402 is separated from the mounting seat 452 downward due to the force component F1 directed downward. In other words, the state of the tool holding portion 430 is a temporary holding state, but it becomes a second state in which the engagement between the front end tool 402 and the mounting seat 452 in the rotational direction is released. In addition, the tool holding portion 430 restricts the disassembly of the front end tool 402 in the second state. Specifically, in the second state, the clamping portions 448 and 438 have not moved to a position where they can pass through the hole portion 24 of the front end tool 402.

[0243] In the tool holding portion 430, when the front end tool 402 is located at a predetermined position between the first position and the second position (in the middle of rotation), if the force acting on the front end tool 402 is released, the front end tool 402 is moved to the first position or the second position by the clamping portions 438 and 448. In other words, the front end tool 402 in the middle of rotation automatically moves to the original first position ( Figure 25 ) or the adjacent second position ( Figure 28 This is because the movement of the clamping parts 448 and 438 toward the open position due to the force of the O-ring 426 becomes an upward force and is transmitted to the tip tool 402. As a result, the tip tool 402 moving upward receives a reaction force from the inclined part, generating a component force that rotates the tip tool 402.

[0244] like Figure 28 As shown, when the operator further rotates the tip tool 402 from the position in the middle of the rotation, the tip tool 402 is located at the adjacent second position. In this way, the operator can change the position of the tip tool 402 in the rotation direction in the temporarily held state.

[0245] The operator applies force to the clamping parts 438 and 448 in the second state through the front tool 402, and the state of the tool holding part 430 becomes the third state of the temporary holding state. Figure 17The same state is omitted from the illustration. In addition, in the present embodiment, as described above, a force toward the next rotational position is generated at the moment when the convex portion 406C passes over the convex portion 452B, so the force exerting force on the front end tool 402 in the downward direction at this moment is released. Therefore, the third state will not be achieved by configuring so as to utilize only the force in the rotational direction centered on the axis KA. Thus, the falling (detachment) of the front end tool 402 during the rotational position adjustment is suppressed. In addition, the third state can also be achieved by configuring so as to utilize only the force in the rotational direction centered on the axis KA. In the present embodiment, the operator applies a force in the rotational direction centered on the axis KA to the front end tool 402, and can switch from the first state to the second state, and the operator applies a force in the direction of the axis KA (up and down directions) to the front end tool 402, and can switch from the first state to the second state and the third state.

[0246] As also described in the first embodiment, in the third state, while the clamping portions 438 and 448 are held by the clamping shaft 412, the tip tool 402 can be moved relative to the mounting seat 452 in a direction along the axis KA (vertical direction). Specifically, in the third state, the clamping portions 448 and 438 are moved to a position (closed position) in which they can pass through the hole 24 of the tip tool 402. Thus, in the temporarily held state, when the tip tool 402 is moved upward (toward the mounting seat 452), the tip tool 402 can be attached to the tool holding portion 430 by switching the temporarily held tool holding portion 430 between the first state, the third state, and the first state. Furthermore, when the tip tool 402 is moved downward, the tip tool 402 can be removed from the tool holding portion 430.

[0247] Simply by operating the clamping handle 62 to actuate the clamping portions 438 and 448, the tool holding portion 430 can be switched from a non-holding state to a holding state, thereby holding the tip tool 402 in the tool holding portion 430. Furthermore, the tool holding portion 430 can be switched from a non-holding state to a holding state, thereby allowing the tip tool 402 to be detached from the tool holding portion 430 by its own weight.

[0248] In the tool holding portion 430, even when the operating force on the clamping handle 62 is released, the front end tool 402 can be switched from a non-holding state to a holding state by applying force to the front end tool 402 (for example, by an operator) so that the front end tool 402 is held in the tool holding portion 430, and can be switched from a holding state to a non-holding state.

[0249] Specifically, the holding state includes a fixed state and a first state of a temporarily holding state. Furthermore, the non-holding state includes a second state and a third state of a temporarily holding state, as well as a released state. The operator can switch between the fixed and released states simply by operating the clamping handle 62. Furthermore, even when the clamping handle 62 is released, the operator can switch between the first state and the second state (or the third state) by operating the tip tool 402 while in the temporarily holding state.

[0250] As described above, in the electric tool 400 , the position of the tool tip 402 in the rotational direction can be adjusted without removing the tool tip 402 , and the tool tip 402 can be detached by its own weight, thereby improving operability.

[0251] [Structure of the Third Embodiment] An electric power tool 460 as a working machine according to the third embodiment will be described. Components identical or similar to those of the first and second embodiments are designated by the same reference numerals, and their descriptions will be omitted. Identical components include those that differ in shape or size but function identically as a whole.

[0252] Figure 29 The illustrated power tool 460 is configured, similar to the structure described in Patent Document 2, such that multiple protrusions 492 of a connecting ring 486 (mounting seat) engage with multiple through-holes 458B and their peripheral edges of a tip tool 456 to transmit rotational force. Furthermore, the power tool 460 is configured to clamp the tip tool 456 using a tool shaft 482 inserted from below a clamping shaft 462. Thus, the power tool 460 is configured to transmit rotational force to the tip tool 456 and to restrict relative rotation of the tip tool 456 with respect to the tool holder 480.

[0253] <Overview of Power Tools> Figure 29 As shown, power tool 460 is configured so that tip tool 456 can be replaced with another tip tool. Power tool 460 is a cordless multi-function tool that operates on power from a battery pack (not shown). As an example, power tool 460 vibrates tip tool 456. Hatching is omitted to clarify the shapes of various components.

[0254] Front-end tools Figure 30 The front end tool 456 shown is a member extending in the front-back direction and has a front flat plate portion 457 and a rear mounting portion 458. A blade portion (not shown) is formed at the front end of the flat plate portion 457.

[0255] The mounting portion 458 is located obliquely above the flat plate portion 457. The mounting portion 458 is formed with a single hole 458A and multiple through-holes 458B. The hole 458A is formed in the center of the mounting portion 458. The multiple through-holes 458B are located outside the hole 458A and are arranged in a circular pattern around the hole 458A. The hole 458A is sized to allow the shaft body 484 of the tool shaft 482, described below, to pass therethrough. Multiple protrusions 492, described below, are inserted through the multiple through-holes 458B. Furthermore, the mounting portion 458 has a lower surface 458C and an upper surface 458D.

[0256] 〈Details of Power Tools〉 Figure 29 The electric power tool 460 shown includes a motor 52, a clamp shaft 462, a clamp handle 62, and a tool holding portion 480. The electric power tool 460 also includes a housing 468 and an output shaft portion 472.

[0257] <<Clamping Shaft>> The clamping shaft 462 is an example of an output shaft that is rotated by the motor 52 about its axis KB. The clamping shaft 462 is supported by a unit case 474 (described below). The clamping shaft 462 is composed of an upper shaft portion 463 and a lower shaft portion 464 that are arranged in the vertical direction.

[0258] The upper shaft portion 463 is composed of an integrated cylindrical portion 463A, a tubular portion 463B, and a flange portion 463C. The cylindrical portion 463A extends vertically. The upper portion of the cylindrical portion 463A protrudes upward beyond the guide portion 478 described below. The upper end surface 463D of the cylindrical portion 463A is a flat surface extending in the front-to-back and left-to-right directions. The upper end surface 463D is vertically opposed to the pusher 64 and is positioned so as to contact the pusher 64 as the clamping handle 62 rotates.

[0259] The flange portion 463C extends radially outward from the lower end portion of the cylindrical portion 463B and is biased by the clamp spring 134 so as to contact the lower end portion of the upper wall portion 477 .

[0260] The lower shaft portion 464 includes a column portion 464A and a barrel portion 464B. The column portion 464A extends in the vertical direction. The upper portion of the column portion 464A is inserted into and fixed to the barrel portion 463B. Specifically, the external thread portion provided on the upper portion of the column portion 464A is threadedly engaged with the internal thread portion inside the barrel portion 463B, thereby fixing the column portion 464A to the barrel portion 463B. In addition, the upper shaft portion 463 and the lower shaft portion 464 can also be integrated into a single component. A spring 465 is inserted into the inner side of the barrel portion 464B. In detail, the spring 465 is pressed into and fixed to the inner side of the barrel portion 464B. Two spiral cam grooves 466 are formed in the barrel portion 464B. The two cam grooves 466 guide the support pin 424 of the tool shaft 482 described below and support the two axial ends of the support pin 424.

[0261] The clamping shaft 462 moves between a first position P1 and a second position P2 in the vertical direction in response to the rotation of the clamping handle 62. The position of the clamping shaft 462 is shown as an example using the position of the upper end surface 463D. The second position P2 is located below the first position P1. Furthermore, a third position P3 exists, intermediate between the first and second positions P1 and P2.

[0262] <<Output Shaft>> The output shaft 472 is a portion of the electric tool 460 that holds the tool tip 456 and vibrates it. The output shaft 472 includes a unit housing 474, a support pin 424, and a clamp spring 134. The output shaft 472 is configured to rotate (or swing) the clamp shaft 462 about the axis KB.

[0263] The unit case 474 includes a storage portion 476 , an upper wall portion 477 , and a guide portion 478 . The unit case 474 supports a tool holding portion 480 .

[0264] The housing portion 476 is a cylindrical portion with the vertical direction as its axial direction. The rocker arm 88 is fixed to the housing portion 476. The vertical center portion of the housing portion 476 contacts the inner ring of the needle roller bearing 43. The lower portion of the housing portion 476 contacts the oil seal 44. The housing portion 476 houses the clamp shaft 462, the clamp spring 134, and the shaft body 484 (described below). A connecting ring 486 (described below) is provided at the lower end of the housing portion 476.

[0265] Upper wall portion 477 covers the upper end of storage portion 476. Guide portion 478 is a cylindrical portion extending upward from upper wall portion 477. Guide portion 478 is supported by ball bearing 42 for rotation about axis KB. Through-hole 479 is formed in upper wall portion 477 and guide portion 478. Column portion 463A is inserted into through-hole 479.

[0266] Tool holding unit Figure 30 The tool holding portion 480 shown includes a tool shaft 482, a connecting ring 486, a coil spring 494, and a disc spring 496. The tool holding portion 480 is held by the clamp shaft 462 and the unit housing 474.

[0267] (Tool Shaft) The tool shaft 482 includes a shaft body 484, a bottom portion 485, and a support pin 424. The shaft body 484, the bottom portion 485, and the support pin 424 are integrated. The tool shaft 482 is an example of a clamping portion that is detachably attached to the lower portion of the clamping shaft 462. When attached to the clamping shaft 462, the tool shaft 482 supports the tip tool 456 from below.

[0268] The shaft body 484 is a detachable shaft portion relative to the clamp shaft 462. The shaft body 484 is formed into a cylindrical shape extending in the vertical direction around the axis KB. The lower portion of the shaft body 484 is sized to be inserted into the hole 458A.

[0269] Bottom portion 485 extends radially from the lower end of shaft body 484. Bottom portion 485 is formed in the shape of a circular plate having a predetermined thickness in the vertical direction. A circular recess 485A centered on axis KB is formed at the upper end of bottom portion 485. Bottom portion 485 is of a size that can be grasped by an operator.

[0270] The support pins 424 protrude left and right from the outer circumference of the shaft body 484. The support pins 424 can be inserted into the two cam grooves 466. Furthermore, the support pins 424 are supported by the clamp shaft 462 at the distal ends of the two cam grooves 466. In other words, the tool shaft 482 is coupled to the clamp shaft 462.

[0271] (Connecting Ring) The connecting ring 486 is an example of a mounting seat. The connecting ring 486 is provided at the lower end portion of the unit case 474. The connecting ring 486 includes a first cylindrical portion 487, a second cylindrical portion 488, and a plurality of protrusions 492.

[0272] The first cylindrical portion 487 and the second cylindrical portion 488 are integrally formed with the axis KB as the coaxial center. The first cylindrical portion 487 is positioned above the second cylindrical portion 488. The inner diameter of the first cylindrical portion 487 is larger than that of the second cylindrical portion 488. The lower end of the unit housing 474 is press-fitted into the inner side of the first cylindrical portion 487. When the tool shaft 482 is assembled with the clamping shaft 462, the lower portion of the shaft body 484 is radially spaced apart from the inner side of the second cylindrical portion 488.

[0273] Multiple protrusions 492 protrude downward from the lower surface of the second cylindrical portion 488. For example, each of the multiple protrusions 492 has a cylindrical upper portion and an inverted truncated cone lower portion. Furthermore, the multiple protrusions 492 are sized to be inserted into the multiple through-holes 458B of the tip tool 456 and to contact the walls of the multiple through-holes 458B. When viewed from below, the multiple protrusions 492 are positioned so as to surround the hole portion 458A.

[0274] (Coil Spring) Coil spring 494 is inserted into the lower portion of shaft body 484. Coil spring 494 is located between the inner circumference of second cylindrical portion 488 and the outer circumference of shaft body 484. Coil spring 494 is elastically deformable in the vertical direction. The lower end of coil spring 494 contacts upper surface 458D of tip tool 456. The upper end of coil spring 494 is attached to the lower end surface of unit housing 474. In other words, coil spring 494 is configured to apply a downward force to tip tool 456.

[0275] Coil spring 496 is disposed in recessed portion 485A and can be accommodated therein. The lower portion of shaft body 484 is inserted into coil spring 496. Coil spring 496 is elastically deformable in the vertical direction. The lower end of coil spring 496 is attached to the bottom surface of recessed portion 485A. The upper end of coil spring 496 contacts lower surface 458C of tip tool 456. In other words, coil spring 496 is configured to apply an upward force to tip tool 456.

[0276] In the tool holding portion 480 , the tip tool 456 is vertically sandwiched between the connecting ring 486 and the coil spring 494 and the tool shaft 482 and the disc spring 496 to hold the tip tool 456 (including a temporary holding state and a fixed state).

[0277] If the spring load of the clamp spring 134 is N1, the spring load of the coil spring 494 is N2, and the spring load of the disc spring 496 is N3, then in the power tool 460, the relationship N3 < N2 < N1 holds. The spring load refers to the load (force) applied by the spring to the object. The illustration of the spring loads N1, N2, and N3 is omitted.

[0278] In the electric tool 460, the front end tool 456 is held at a specific position in the rotational direction by means of coil springs 494 and disc springs 496 arranged above and below the front end tool 456. Furthermore, the front end tool 456 is also held at a specific position in the vertical direction by the coil springs 494 and disc springs 496 arranged above and below. The holding position in the vertical direction can be adjusted by the force of the springs. In this state, when the operator applies an operating force in the rotational direction to the front end tool 456, the front end tool 456 overcomes the force of the disc springs 496 and moves downward. Furthermore, the plurality of protrusions 492 inserted into the plurality of through holes 458B of the front end tool 456 are disengaged from the plurality of through holes 458B, so that the rotational position of the front end tool 456 can be adjusted.

[0279] <<Status of the tool holding unit>> Figure 29 The tool holding portion 480 shown can be in either a fixed state or a temporary holding state even when the operating force on the clamp handle 62 is released.

[0280] The fixed state of the tool holder 480 means that a clamping force is applied to the tip tool 456, and the tip tool 456 is fixed to the tool holder 480. In the fixed state, the tool holder 480 can fix the tip tool 456 at a plurality of rotational positions around the axis KB.

[0281] The temporary holding state of the tool holding portion 480 is a state in which the force in the clamping direction applied to the tip tool 456 is weaker than that in the fixed state. The temporary holding state includes a first state and a second state.

[0282] The first state in the temporary holding state is a state in which the rotation of the tip tool 456 due to its own weight is restricted and a state in which the tip tool 456 is restricted from being separated from the tool holding portion 480 .

[0283] The second state in the temporary holding state is a state in which force is applied to the tip tool 456 held by the tool holding portion 480 in the first state.

[0284] In the second state, the tip tool 456 can be rotated from one of the plurality of rotational positions to another rotational position while the tool shaft 482 restricts detachment of the tip tool 456 from the tool holding portion 480 .

[0285] The tool holding portion 480 in the temporary holding state is configured to hold the front end tool 456 while suppressing the movement from one rotational position among a plurality of rotational positions to other rotational positions. On the other hand, it is configured to hold the front end tool 456 in a manner that enables the movement from one rotational position among a plurality of rotational positions to other rotational positions when the force applied to the front end tool 456 in the rotational direction centered on the axis KB becomes greater than a predetermined value.

[0286] In this embodiment, the temporary holding state includes at least a second state in which the tip tool 456 and the connecting ring 486 can be separated to a position where the connecting ring 486 and the tip tool 456 are disengaged in the rotational direction around the axis KB.

[0287] Furthermore, in this embodiment, the temporary holding state includes a second state. In the second state, the tool holding portion 480 restricts the tip tool 456 from being detached.

[0288] The tool holder 480 also has the following functions. The tool holder 480 is configured to hold the tip tool 456 in multiple rotational positions about the axis KB. Furthermore, the tool holder 480 can be in a holding state, in which the tip tool 456 is held, and a non-holding state, in which the tip tool 456 is not held. The holding state holds the tip tool 456, preventing it from rotating about the axis KB and preventing it from detaching from the tool holder 480.

[0289] Furthermore, even when the operating force on the clamp handle 62 is released, the tool holding portion 480 can be switched from the non-holding state to the holding state by applying force to the tool holding portion 480 via the tool tip 456 , so that the tool tip 456 can be held in the tool holding portion 480 .

[0290] [Function of the third embodiment] Figures 29 to 32 The function of the electric tool 460 will be described.

[0291] like Figure 31 As shown in the upper section of FIG. , as an example, the tip tool 456 is fixed by the tool holding portion 480 at the start of the operation.

[0292] like Figure 32 As shown in the DD line cross section, in the fixed state of the tool holding portion 480, the protrusion 492 is inserted into the through hole 458B and penetrates the tip tool 456 in the up-down direction.

[0293] Then, if Figure 29 As shown, when the operator rotates the clamp handle 62 to the position indicated by the two-dot chain line, the pusher 64 comes into contact with the clamp shaft 462, and the clamp shaft 462 moves downward.

[0294] Therefore, if Figure 31 As shown in the middle section of FIG, the tool shaft 482 moves downward (protrudes) relative to the connecting ring 486. Here, when the operator rotates the tool shaft 482, the tool shaft 482 is disengaged from the clamping shaft 462, thereby removing the tip tool 456. In other words, the tool holding portion 480 is released.

[0295] On the other hand, if the operator does not rotate the tool shaft 482, the tool holder 480 is in a temporarily held state. In other words, the tip tool 456 is temporarily held due to the balance of spring loads from the coil spring 494 and the disc spring 496. This balance restricts rotation of the tip tool 456 under its own weight, while allowing the rotational position to be changed by the operator. This is because upward movement of the tip tool 456 is suppressed by the coil spring 494, while downward movement is suppressed by the disc spring 496. If the tip tool 456 is tilted upward, it becomes difficult to change its rotational position; if it is tilted downward, it rotates due to its own weight.

[0296] like Figure 32 As shown in the EE line cross section, in the temporary holding state of the tool holding portion 480, only the lower end portion of the protrusion 492 is inserted into the through hole 458B.

[0297] Then, if Figure 31 As shown in the lower section of FIG, when the operator rotates the tip tool 456, the tip tool 456 moves downward relative to the connection ring 486.

[0298] like Figure 32As shown in the cross-section along line FF, the tip tool 456 moves downward, causing the entire protrusion 492 to disengage from the through-hole 458B. Here, the operator rotates the tip tool 456, causing the lower end of the protrusion 492 to contact the upper surface 456A of the tip tool 456 (including the periphery of the through-hole 458B). Furthermore, the protrusion 492 is inserted into another through-hole 458B. In this manner, while the tool holder 480 temporarily holds the tip tool 456, the position of the tip tool 456 in the rotational direction is adjusted.

[0299] In addition, in the temporary holding state of the tool holding portion 480, the front end tool 456 is forcibly separated from the multiple protrusions 492 (connecting ring 486), so that the rotation position of the front end tool 456 can be changed even when the power tool 460 is reversed upside down.

[0300] As described above, in the electric power tool 460 , the position of the tip tool 456 in the rotational direction can be adjusted without removing the tip tool 456 , and thus operability can be improved.

[0301] [Modification of the Third Embodiment] Figure 33 A third embodiment of the present invention is shown as an electric tool 460 ( Figure 30 ) of the modified example of the electric tool 500, the temporary holding state and the fixed state.

[0302] The power tool 500 is different from the power tool 460 in that the clamping shaft 462 ( Figure 30 ) and has a clamping shaft 502, and removes the coil spring 494 ( Figure 30 ). Other structures are the same as those of the electric tool 460.

[0303] The clamp shaft 502 is an example of an output shaft. The clamp shaft 502 is supported by the unit housing 474. The clamp shaft 502 includes the cylindrical portion 464B ( Figure 30 ) has the same structure as the clamping shaft 462 except that it is replaced by the cylindrical portion 504.

[0304] The vertical length of the cylindrical portion 504 is longer than the vertical length of the cylindrical portion 464B. Therefore, when the tool end 456 is temporarily held in the power tool 500, the lower end surface 504A of the cylindrical portion 504 contacts the upper surface 458D of the tool end 456. Due to the contact between the lower end surface 504A and the upper surface 458D, the lower end of the clamp shaft 502 applies a force downward to the tool end 456.

[0305] When the clamp shaft 502 moves upward due to the biasing force of the clamp spring 134 , the lower end surface 504A moves upward away from the upper surface 458D.

[0306] In this way, the coil spring 494 ( Figure 30 ) and uses a structure that makes the clamping shaft 502 contact the front end tool 456.

[0307] [Other Modifications] Modifications not shown in the drawings will be described below.

[0308] When the tool end 16 is held by the tool holding portion 100 (in a posture extending in the front-back or left-right direction), the clamping portions 158 and 178 do not overlap with the tool end 16 (are not aligned with the tool end 16) when viewed in the clamping direction when in the closed position, and overlap with the tool end 16 (are aligned with the tool end 16) when viewed in the clamping direction when in the open position. For example, in the present embodiment, the clamping portions 158 and 178 are configured to be located on the lower surface side of the tool end 16 through the interior (hole portion) of the tool end 16, but the clamping portion may also be configured to support the lower surface of the tool end 16 through the exterior (outer periphery) of the tool end 16.

[0309] When moving from the open position to the closed position, the clamping parts 158 and 178 do not need to transmit force from the tip tool 16. The clamping parts are not limited to rotating parts; a pair of sliding parts that slide linearly (for example, parallel to the front-back direction) may also be used. Instead of tapered surfaces 158B and 178B, the clamping parts 158 and 178 may also have curved surfaces. In other words, the clamping parts 158 and 178 only need to have a mechanism that converts upward force into the direction in which the clamping parts move.

[0310] The O-ring 136 does not necessarily have to apply force to the clamping parts 158 and 178 in the closed position toward the open position. Furthermore, the O-ring 136 does not necessarily have to apply force to the clamping parts 158 and 178 in the open position. The O-ring 136 only needs to apply force in the closed position and does not necessarily need to apply force in the open position. The O-ring 136 can also be used as an adjustment component to adjust the pressing force applied by the tip tool 16 on the clamping parts 158 and 178 to an appropriate load.

[0311] As other examples of the urging member and elastic body that urges the movable parts 156 and 176, a spring member such as a coil spring or a disc spring may be used in place of the O-ring 136. In other words, the urging member need not be an annular elastic body. The urging member may also urge only one of the movable part of the first clamping member or the movable part of the second clamping member. In this case, the other movable part may be left stationary.

[0312] The support pin 132 supporting the clamping parts 158 and 178 may be provided on a member different from the clamping bracket 126. The clamping member and the movable part may be located on the same side relative to the support shaft.

[0313] The link portion is not limited to a through hole like the link holes 157 and 177 , and may be a link groove with a bottom.

[0314] The moving portion is not limited to the pusher 64 that moves the clamp shaft 112 to the third position P3 according to the arrangement relative to the pin 46 , and may be a pressing member provided as a member different from the pusher 64 that moves the clamp shaft 112 to the third position P3 .

[0315] The mounting seat 107 is configured to transmit rotation by utilizing a concave-convex structure (concave portion 107A and convex portion 107B) that engages with the protrusion 21 having a plurality of concave portions 21B, but is not limited thereto. For example, a configuration may also be provided in which protrusions are inserted through a plurality of through-holes 26 formed in the front end tool 16, and the rotational force is transmitted by utilizing the inserted protrusions. In this case, in the temporary holding state, the mounting seat 107 and the first clamping member 144 and the second clamping member 164 (holding surfaces 158D and 178D) are separated in the vertical direction to the extent that the protrusions are disengaged from the through-holes 26 (the extent to which the engagement in the rotational direction is released), so that the direction of the front end tool 16 can be rotated and adjusted.

[0316] The power tool 400 may have a structure in which the temporary holding state includes only the second state and does not include the third state. Alternatively, the temporary holding state may include the third state and not include the second state. The tool holding portion 430 may not be provided with a reaction force generating portion.

[0317] The electric tool 400 may not have either or both of the inclined surface 407A and the inclined surface 454. For example, both the inclined surface 407A and the inclined surface 454 may be curved surfaces.

[0318] The electric tool 400 may have a structure in which, when the force acting on the tool tip 402 is released, the tool tip 402 does not move to the first position or the second position due to the clamping portions 438 and 448 .

[0319] Explanation of symbols

[0320] 10—electric tool, 12—housing, 13—lower opening, 14—battery pack, 15—upper opening, 16—front end tool, 17—flat plate, 17A—knife, 18—mounting portion, 19—plate, 21—protrusion, 21A—outer peripheral portion, 21B—recess, 21C—protrusion, 22—upper wall, 24—hole, 25—insertion portion, 26—through hole, 27—cutout, 32—inner housing, 34—motor housing, 35—intermediate housing, 36—bracket, 37—mounting portion, 38—cylinder, 39—support wall, 40—control board, 41—switch, 42—ball bearing, 43—needle bearing, 44—oil seal, 46—pin, 48—rubber component, 52—motor, 53—rotating shaft, 61—trigger, 62 —Clamping handle, 63—Handle body, 63A—Base end portion, 63B—Holding portion, 64—Pushing member, 65—Outer peripheral portion, 66—Non-contact portion, 67—Plane, 68—Plane, 71—Contact portion, 72—First plane, 73—Curved surface, 74—Second plane, 80—Drive mechanism, 82—Spindle, 84—Ball bearing, 86—Eccentric shaft portion, 88—Rocker arm, 88A—Mounting portion, 88B—Arm portion, 90—Output shaft portion, 92—Unit housing, 94—Storage portion, 94A—Outer peripheral surface, 94B—Inner peripheral surface, 96—Upper wall portion, 98—Guide portion, 99—Through hole, 100—Tool holding portion, 102—First diameter expansion portion, 103—Step surface, 104—Second diameter expansion portion, 104A—Inner peripheral surface , 105—step surface, 106—through hole, 107—mounting seat, 107A—recess, 107B—convex portion, 108—inclined surface, 112—clamping shaft, 114—first shaft portion, 115—upper end surface, 116—second shaft portion, 118—flange portion, 122—support portion, 122A—opposing wall, 122B—opposing wall, 124—guide pin, 126—clamping bracket, 127—base, 127A—lower surface, 127B—opening portion, 128—vertical wall portion, 129—transverse wall portion, 131—recess, 132—support pin, 134—clamping spring, 136—O-ring, 137—pressing portion, 142—clamping component, 144—first clamping component, 146—insertion portion, 146A—insertion Hole, 147—contact surface, 148—extending portion, 148A—upper surface, 149—curved surface, 152—support leg portion, 153—opposing surface, 154—protrusion, 156—movable portion, 157—connecting rod hole, 157A—long hole portion, 157B—widening portion, 158—clamping portion, 158A—bottom surface, 158B—tapered surface, 158C—side surface, 158D—holding surface, 161—groove portion, 164—second clamping member, 166—insertion portion, 166A—insertion hole, 167—contact surface, 168—extending portion, 168A—upper surface, 169—curved surface, 172—support leg portion, 173—opposing surface, 174—protrusion, 176—movable portion, 177—connecting rod hole, 177A—long hole portion,177B—widening portion, 178—clamping portion, 178A—bottom surface, 178B—tapered surface, 178C—side surface, 178D—holding surface, 181—groove portion, 210—power tool, 242—ball bearing, 246—pin, 264—pushing member, 272—first plane, 273—curved surface, 274—second plane, 280—driving mechanism, 292—unit housing, 300—tool holding portion, 312—clamping shaft, 315—upper end surface, 318—flange portion, 324—guide pin, 331—recessed portion, 332—support pin, 334—clamping spring, 336—O-ring, 357—connecting rod hole, 357A—long hole portion, 357B—widening portion, 364—second clamping member, 376— Movable part, 376A—protrusion, 378—clamping part, 400—electric tool, 402—front end tool, 403—flat plate part, 404—mounting part, 405—plate part, 406—protrusion, 406A—outer peripheral part, 406B—recess, 406C—convex part, 407A—inclined surface, 407B—curved surface, 408—upper wall, 409—hole part, 409A—insertion part, 409B—cut-out part, 412—clamping shaft, 412A—first shaft part, 412B—second shaft part, 412C—flange part, 412D—support part, 412E—guide pin, 413—upper end surface, 414—output shaft part, 416—unit housing, 417—storage part, 418—upper wall part, 419—guide part, 419A—through hole, 421—first expanded diameter portion, 422—second expanded diameter portion, 422A—inner circumferential surface, 424—support pin, 426—O-ring, 430—tool holding portion, 432—clamping component, 434—first clamping component, 435—insertion portion, 435A—insertion hole, 436—support leg portion, 437—movable portion, 438—clamping portion, 438A—bottom surface, 438B—tapered surface, 438C—holding surface, 438D—opposing surface, 438E—protrusion, 439—connecting rod hole, 439A—long hole portion, 439B—widening portion, 444—second clamping component, 445—insertion portion, 446—support leg portion, 447—movable portion, 448—clamping portion, 448A—bottom surface, 448B —tapered surface, 448C—holding surface, 448D—opposing surface, 448E—protrusion, 449—connecting rod hole, 449A—long hole portion, 449B—widened portion, 452—mounting seat, 452A—recess, 452B—convex portion, 454—inclined surface, 456—front end tool, 456A—upper surface, 457—flat plate portion, 458—mounting portion, 458A—hole portion, 458B—through hole, 458C—lower surface, 458D—upper surface, 460—electric tool, 462—clamping shaft, 463—upper shaft portion, 463A—cylindrical portion, 463B—cylindrical portion, 463C—flange portion, 463D—upper end surface, 464—lower shaft portion, 464A—column portion, 464B—cylindrical portion, 465—spring,466—cam groove, 468—housing, 472—output shaft portion, 474—unit housing, 476—storage portion, 477—upper wall portion, 478—guide portion, 479—through hole, 480—tool holding portion, 482—tool shaft, 484—shaft body, 485—bottom, 485A—recessed portion, 486—connecting ring, 487—first cylindrical portion, 488—second cylindrical portion, 492—protrusion, 494—coil spring, 500—power tool, 502—clamping shaft, 504—cylinder portion, 504A—lower end surface, A1—starting point, A2—end point, C1—center, C2— Center axis, d1—interval, d2—interval, d3—interval, d4—interval, F—force, FA—reaction force, F1—force component, F2—force component, h—clearance, K—line, KA—axis, KB—axis, L1—distance, L2—distance, L3—distance, M—reference plane, N1—spring load, N2—spring load, N3—spring load, P1—first position, P2—second position, P3—third position, PA—position, RW—arrow, θ1—angle, θ2—angle, θ3—angle, θ4—angle, θA—angle, θB—angle, θC—angle, θD—angle.

Claims

1. A working machine, characterized in that: have: motor; an output shaft, which is driven to rotate about its axis by the motor; an operating unit that can be operated by an operator; and A tool holding portion is held by the output shaft and comprises a clamping portion that can be moved according to the movement of the operating portion and a mounting seat that clamps the front end tool in the clamping direction together with the clamping portion to hold the front end tool. The tool holding portion can be in either a fixed state or a temporary holding state even if the operating force applied to the operating portion is released. The fixed state is a state in which the front end tool is fixed to the tool holding portion by applying a force in the clamping direction to the front end tool. The temporary holding state is a state in which the force in the clamping direction applied to the front end tool is weaker than that in the fixed state. The tool holding portion in the fixed state is configured to be able to hold the tip tool at a plurality of rotational positions centered on the axis by means of the clamping portion. The temporary holding state includes a first state in which the rotation of the tip tool and the removal of the tip tool from the tool holding portion are restricted, and includes at least one of a second state and a third state in which a force is applied to the tip tool held by the tool holding portion in the first state. In the second state, the tip tool can be rotated from one of the plurality of rotational positions to another of the plurality of rotational positions while the clamping portion restricts the removal of the tip tool from the tool holding portion. In the third state, the front end tool is allowed to move in the direction of the axis while maintaining the clamping portion held by the output shaft, and force is applied to the front end tool to switch between the first state and the third state, thereby enabling at least one of the front end tool to be installed on and removed from the tool holding portion.

2. The working machine according to claim 1, characterized in that When the temporary holding state includes the second state, in the second state, the tool tip and the mounting seat can be separated to a position where engagement between the mounting seat and the tool tip in the rotational direction is released.

3. The working machine according to claim 1, wherein: The temporary holding state includes both the second state and the third state. The tool holding portion restricts detachment of the tip tool in the second state, and the clamp portion in the second state is biased via the tip tool to enter the third state.

4. The working machine according to claim 1, wherein: The tool holding portion is provided with a reaction force generating portion. When the tool holding portion rotates the tip tool about the axis in the first state, the reaction force generating portion contacts the tip tool to apply a force in a direction away from the mounting seat to the tip tool.

5. The working machine according to claim 1, wherein: An inclined portion is formed on at least one of the mounting seat and the front end tool. If a force in a rotational direction is applied to the front end tool held by the tool holding portion in the first state, the inclined portion applies a force in a direction away from the mounting seat to the front end tool, resulting in the second state in which the engagement between the front end tool and the mounting seat in the rotational direction is released.

6. The working machine according to claim 1, wherein: The tool holding portion in the fixed state is capable of holding the tip tool at a first position, which is one of the plurality of rotational positions, and at a second position, which is a position adjacent to the first position in the rotational direction. The tool holding portion in the first state is configured such that if the force acting on the tip tool is released when the tip tool is located at a predetermined position between the first position and the second position, the tip tool is moved to the first position or the second position by the clamping portion.

7. A working machine, characterized in that: have: an operating unit, which can be operated by an operator; as well as The tool holding portion includes a pair of clamping portions that can be opened and closed according to the operation of the operating portion and a mounting seat that clamps the front end tool in the clamping direction together with the clamping portions to hold the front end tool. The tool holding portion can be in either a fixed state or a temporary holding state. The fixed state is a state in which the clamping portion is located at a fixed position and applies a force in the clamping direction to the front end tool to fix the front end tool to the tool holding portion. The temporary holding state is a state in which the clamping portion is located at a position different from the fixed position and the force in the clamping direction applied to the front end tool is weaker than that in the fixed position. When the tool holding portion is in the temporary holding state, the clamping portion is configured to be able to change its position to an open position and a closed position, the open position being a position in which the front end tool can be held by the tool holding portion, and the closed position being a position in which the front end tool can be installed on the tool holding portion or removed from the tool holding portion, and when located in the open position, the clamping portion can move to the closed position according to the force received from the front end tool.

8. The working machine according to claim 7, characterized in that: When the front end tool is held by the tool holding portion, the clamping portion does not overlap with the front end tool when viewed in the clamping direction when it is located in the closed position, and overlaps with the front end tool when it is located in the open position.

9. The working machine according to claim 7, characterized in that: In the temporary holding state, the clamp portion is configured to transmit force from the tool end and move from the open position to the closed position to enable attachment and detachment of the tool end to the tool holding portion.

10. The working machine according to claim 9, characterized in that: A biasing member is provided for biasing the clamping portion located at the closed position to move the clamping portion toward the open position.

11. The working machine according to claim 10, characterized in that: The tool holding portion includes a support shaft extending in an axial direction and a clamping member rotatable about the support shaft, wherein the axial direction intersects both the clamping direction and a direction intersecting the clamping direction. The clamping member is provided on one side of the clamping direction of the support shaft. A movable portion biased by the biasing member is provided on the other side of the clamping member relative to the support shaft in the clamping direction.

12. The working machine according to claim 11, characterized in that: A clamping shaft is provided which moves between a first position and a second position according to the movement of the operating portion. When the clamping shaft is located at the first position, the clamping portion is located at the fixed position. When the clamp shaft is located at the second position, the clamp portion is located at a release position for releasing the holding of the tip tool. When the clamp shaft is located at a third position between the first position and the second position, the clamp portion is in the temporary holding state. A pin component is installed on the clamping shaft. The movable portion is provided with a link portion extending in a direction intersecting the clamping direction, and the pin member is inserted into the link portion. When the clamp shaft is located at the third position and the clamp portion is located at the open position, the opening movement of the clamp portion is restricted by the contact between the pin member and the link portion.

13. A working machine, characterized in that: have: an operating unit, which can be operated by an operator; a clamping shaft that moves between a first position and a second position according to the operation of the operating portion; a tool holding portion that applies a clamping force in a clamping direction to the tip tool to hold the tip tool; and The clamping portion is provided on the tool holding portion and can move in a direction intersecting the clamping direction according to the movement of the clamping shaft. When the clamp shaft is located at the first position, the clamp portion overlaps with the tool tip in the clamping direction and is fixed to bias the tool tip in the clamping direction. When the clamp shaft is located at the second position, the clamp portion moves in the intersecting direction to release the holding of the tip tool. Switching from the fixed state to the released state and switching from the released state to the fixed state can be performed only by operating the operating portion.

14. A working machine, characterized in that: have: motor; an output shaft, which is driven to rotate about its axis by the motor; an operating unit that can be operated by an operator; and A tool holding portion is held by the output shaft and comprises a clamping portion that can be moved according to the movement of the operating portion and a mounting seat that clamps the front end tool in the clamping direction together with the clamping portion to hold the front end tool. The tool holding portion is configured to hold the front end tool at a plurality of rotational positions about the axis, and is capable of being in a holding state in which the front end tool is held so as to be unable to rotate about the axis and unable to detach from the tool holding portion, and in a non-holding state in which the front end tool is not held. As for the tool holding portion, only by operating the operating portion, the tool holding state can be switched from the non-holding state to the holding state to hold the front end tool in the tool holding portion, and the tool holding state can be switched from the holding state to the non-holding state to detach the front end tool from the tool holding portion by its own weight. Furthermore, even when the operating force on the above-mentioned operating part is released, the above-mentioned front-end tool can be switched from the above-mentioned non-holding state to the above-mentioned holding state by applying force to the above-mentioned front-end tool, so that the above-mentioned front-end tool can be held in the above-mentioned tool holding part and switched from the above-mentioned holding state to the above-mentioned non-holding state.

15. A working machine, characterized in that: have: motor; an output shaft, which is driven to rotate about its axis by the motor; an operating unit that can be operated by an operator; and A tool holding portion is held by the output shaft and comprises a clamping portion that can be moved according to the movement of the operating portion and a mounting seat that clamps the front end tool in the clamping direction together with the clamping portion to hold the front end tool. The tool holding portion can be in either a fixed state or a temporary holding state even if the operating force applied to the operating portion is released. The fixed state is a state in which the front end tool is fixed to the tool holding portion by applying a force in the clamping direction to the front end tool. The temporary holding state is a state in which the force in the clamping direction applied to the front end tool is weaker than that in the fixed state. The tool holding portion in the fixed state is configured to fix the front end tool at a plurality of rotational positions centered on the axis by utilizing the clamping portion, and the tool holding portion in the temporary holding state is configured to hold the front end tool while suppressing movement from one of the plurality of rotational positions to the other rotational positions. On the other hand, when the force applied to the front end tool in the rotational direction centered on the axis is greater than a predetermined value, the front end tool is held so as to be able to move from one of the plurality of rotational positions to the other rotational positions.

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