JP2012183594A - Wrench driven by power tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a wrench capable of easily tightening a nut located within a narrow recess 3 by using a power tool.SOLUTION: In a front end part of a wrench body 6, a central part in the thickness direction is cut with a constant thickness to form an intermediate cavity 10, and a cam 11 in the slidable state is arranged in the intermediate cavity 10. Socket holding holes 7, 12 opened toward the front end side are bored on the body 6 and the cam 11, and a socket 8 having a hexagon hole 27 and an opening 23 is rotatably held. A one-way clutch is formed between the cam 11 and the socket 8. A crank shaft 14 including a crank arm 15 formed at a tip thereof is penetrated through the wrench body 6 from a base end part to the intermediate cavity 10. The crank arm 15 is engaged with a base end part of the cam 11. The cam 11 is rocked by a constant angle by rotation of the crank shaft 14 rotatively driven by the power tool, so as to rotate the socket 8.

Description

  The present invention relates to a wrench that is driven by an electric power tool that is hand-held and rotationally driven, such as an impact driver or an electric drill. More specifically, the present invention relates to a wrench capable of tightening a bolt head and a nut at a place where the handle cannot be rotated to a large extent and a bolt cannot be removed when tightening is completed and the wrench cannot be removed.

Generally, a wrench for tightening a bolt head or nut is tightened by fitting a bolt head or nut to a claw formed at the tip of the wrench and rotating a handle on a plane perpendicular to the bolt axis. The box wrench disclosed in Patent Document 1 is provided with a box in which a bolt head fits in place of the claw at the handle tip, and the box is rotatably attached to the tip of the main body, and is unidirectional between the box and the main body. By providing a ratchet that rotates only at the top, it can be tightened by a reciprocating rotation operation.
By using an electric tool such as an impact driver, a socket bit driven by the electric tool can be fitted to the bolt head or nut, and the bolt or nut can be tightened by a rotational drive coaxial with the bolt shaft.

JP 2004-345011 A

  At the construction site of a wooden building, it is possible to fasten the column material 1 and the beam material 2 in which the mounting holes and the recesses 3 are pre-cut with bolts 4 as shown in FIG. It is done. FIG. 5A is a cross-sectional view of the connecting portion between the column member and the beam member by the bolt 4, and FIG. 5B is a vertical cross-sectional view. In this construction form, the nut 5 penetrating the column material and the beam material and located in the recess 3 of the beam material cannot be rotated greatly in the direction perpendicular to the axis of the handle of the wrench in the recess 3. Alternatively, there is no gap in which the bolt interferes with the wrench, and there is a drawback that it is difficult to tighten the nut even if the ratchet wrench disclosed in Patent Document 1 is used.

  In view of the above disadvantages of the prior art, the present invention provides a “wrench driven by an electric tool” that can easily tighten a nut or bolt head in a narrow recess 3 using an electric tool. It is intended.

  The invention according to claim 1, which achieves the above object, is provided with a socket holding portion 9 for rotatably holding a socket 8 by drilling a socket holding hole 7 opened forward in a front portion of the main body 6. Form. The socket holding portion 9 of the main body 6 is formed by cutting out a central portion of the thickness with a constant thickness to form an intermediate space 10, and a cam 11 that is slidable in the intermediate space 10 is disposed. Similarly to the socket holding portion 9 of the main body 6, the cam 11 is formed with a socket holding hole 12 opened forward to penetrate the socket holding hole 7 of the main body 6 and the socket holding hole 12 of the cam 11. A socket 8 having an engagement hole with a bolt head and a nut and having an opening 23 formed by cutting a part thereof is disposed.

A crankshaft 14 having a crank 13 at the tip is passed through the main body 6 from the base end toward the intermediate space 10, and the crank 13 is positioned at an eccentric position away from the axis of the crankshaft 14. 15 is protruded, and the crank arm 15 is engaged with the proximal end portion of the cam 11. As a result, the cam 11 is swung at a constant angle in conjunction with the rotation of the crankshaft 14.
Further, a one-way clutch is formed between the cam 11 and the socket 8, and the socket 8 is rotated in one direction by rotationally driving the crankshaft 14.

  According to the second aspect of the present invention, the one-way clutch formed between the cam 11 and the socket 8 includes a tooth portion 16 provided at a constant interval on the outer peripheral surface of the socket 8 and an inner peripheral surface of the socket holding hole 12 of the cam 11. This is a combination of ratchet pawls 17 meshing with the tooth portions 16 provided on the top. At this time, the ratchet pawl 17 is disposed in a recess 18 formed in the cam 11 and is urged by a spring 19 toward the inner socket 8.

  The invention according to claim 3 relates to the crank structure of the cam 11, wherein a circular through hole 20 is formed in the base end portion of the cam 11 and a substantially spherical shape having a diameter equal to the diameter of the through hole 20. This connecting ball 21 is mounted on the crank arm 15, and the connecting ball 21 is fitted into the through hole 20 of the cam 11.

The inventions according to claims 4 and 5 relate to the structure of the rotary drive portion by the electric tool, and the invention according to claim 4 is an electric drive that rotates at the base end of the crankshaft 14 like an impact driver. Forming a hexagonal shaft 22 that fits into the box of the tool.
According to the fifth aspect of the present invention, a box 26 is formed at the base end of the crankshaft 14 to be fitted with a driver bit of a power tool that rotates like an impact driver.

  According to the first aspect of the invention, the power tool A is used to tighten the nut 5 in the limited space easily and reliably, such as the recess 3 formed in the beam material or the column material. Can do. That is, the tip of the wrench of the present invention is inserted from a direction perpendicular to the axis of the bolt 4 into a nut screwed into the bolt 4 in a narrow space such as a recess opened only on one side. The nut 5 is fitted into the socket 8. When the crankshaft 14 is rotationally driven in this state, the cam 11 is swung, and the socket 8 is rotated in one direction by the swinging motion of the cam 11 so that the nut 5 can be tightened. At this time, since the front portion of the main body 6 and the front portion of the cam 11 are opened, and the opening portion 23 is formed also in the socket 8, the opening portion 23 of the socket, the opening portion 24 of the main body 6, and the opening of the cam 11 are formed. By matching the portion 25, the nut 5 can be fitted into the socket 8 by inserting the bolt 4 through the opening from the side of the bolt 4 penetrating the nut 5.

According to the second aspect of the present invention, the one-way clutch structure of the cam 11 and the socket 8 can be realized with a simple structure, and the socket can be reliably rotated in one direction by the swinging motion of the cam 11.
According to the third aspect of the present invention, the rotation of the crankshaft driven by the electric tool can be transmitted as a smooth swing motion of the cam 11.

According to the fourth aspect of the present invention, the hexagonal shaft 22 formed at the base end portion of the crankshaft 14 is fitted to the box formed or attached to the electric tool so that the crankshaft 14 is reliably rotated. be able to.
According to the fifth aspect of the present invention, the hexagonal shaft formed or attached to the electric power tool is fitted to the box 26 formed at the base end portion of the crankshaft 14 so that the crankshaft 14 is reliably rotated. Can do.

FIG. 1 is a front view showing an embodiment of a wrench driven by an electric tool according to the present invention, 2 is a side view of the embodiment shown in FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a longitudinal sectional view of a wrench driven by an electric tool showing another embodiment, FIG. 5 is a cross-sectional view showing a usage state of the electric power tool according to the present invention.

Hereinafter, embodiments of a wrench driven by an electric tool according to the present invention will be described with reference to the accompanying drawings.
1 is a front view showing an embodiment of a wrench driven by an electric power tool according to the present invention, FIG. 2 is a side view, and FIG. 3 is a sectional view taken along line III-III in FIG.

The base portion of the main body 6 has a cylindrical shape. The diameter of the main body 6 increases toward the front side, and both the front and back surfaces are cut out to form a flat socket holding portion 9. Further, the socket holding portion is provided with a socket holding hole 7 into which a socket having a circular outer shape is loosely fitted, and has a constant width from the socket holding hole 7 to the front, and in the illustrated embodiment, the diameter of the socket holding hole 7 An opening 24 is provided that opens at about half the width.
Further, the socket holding portion 9 of the main body 6 forms an intermediate space 10 by cutting out the central portion of the thickness with a certain thickness.

  In the intermediate space 10, the cam 11 is disposed so as to have a thickness substantially equal to the gap of the intermediate space 10 and is slidable in the intermediate space 10. The cam 11 is provided with a socket holding hole 12 having substantially the same diameter as the socket holding hole 7 formed in the socket holding portion 9 of the main body 6, and is opened forward like the socket holding portion 9 of the main body 6. An opening 25 is formed. With this structure, the socket 8 having a circular outer shape can be rotatably mounted through the socket holding hole 7 of the main body 6 and the socket holding hole 12 of the cam 11. That is, the cam 11 can rotate around the socket 8.

  The socket 8 to be mounted on the socket holding portion 9 of the main body 6 has a circular outer shape, and a hexagonal hole 27 that fits into a bolt head or a nut is formed at the center of the socket 8, and a part of the socket 8 is cut off to form an opening 23 Is forming. The opening 23 of the socket 8, the opening 24 of the main body 6, and the opening 25 of the cam 11 have substantially the same width, and the nut 5 to be tightened can be obtained by matching the positions of these openings. The screwed bolt 4 can be penetrated. That is, the width W of the openings 23, 24, and 25 is slightly larger than the diameter of the bolt 4, and is a width that prevents the nut or bolt head fitted in the hexagonal hole 27 from coming out.

  As shown in FIG. 3, a crankshaft 14 having a crank 13 at the tip is passed through the main body 6 from the base end toward the intermediate space 10. The crank 13 formed at the tip of the crankshaft 14 is provided with a disc portion at the tip, and the crank arm 15 is protruded at an eccentric position away from the axis of the crankshaft 14 of the disc portion. The base end portion of the cam 11 is engaged. As a result, as shown in FIGS. 3A, 3B and 3C, the cam 11 can be swung at a constant angle around the socket 8 in conjunction with the rotation of the crankshaft 14. ing.

A one-way clutch is formed between the cam 11 that swings around the socket 8 and the socket 8, and the socket 8 is rotated only in one direction.
That is, a ratchet claw 17 that is provided with teeth 16 at regular intervals on the entire outer periphery of the socket 8 and meshes with the teeth 16 provided on the outer periphery of the socket 8 on the inner periphery of the socket holding hole 12 of the cam 11. Place. The ratchet claw 17 is provided with a plurality of claws having one surface steeply inclined and the other surface gently inclined. The ratchet claw 17 maintains an engaged state with respect to rotation in one direction and rotates in the other direction. It is idle with respect to movement.

  The one-way clutch (ratchet structure) of the illustrated embodiment has a structure in which a ratchet claw 17 is disposed in a recess 18 formed in the cam 11 and the ratchet claw 17 is biased by a spring 19 toward the inner socket 8. It is said. The ratchet claw 17 can be slightly moved in the circumferential direction of the socket 8 in the recess 18, and the ratchet claw 17 is pressed against the tooth portion 16 of the socket by a spring 19. As a result, when the tooth portion 16 and the ratchet claw 17 are rotated in the engaging direction, the ratchet claw 17 reliably meshes with the position where the tooth portion is received, and when the meshing state is released to idle, the ratchet claw 17 The gentle inclined surface of the tooth part is moved to a position where it is easy to slide.

  Various one-way clutches (ratchet mechanisms) have been devised and various structures are known. The one-way clutch structure of the socket 8 and the cam 11 in the present invention is not limited to the illustrated structure. However, the one-way clutch in the illustrated embodiment can realize a mechanism that functions reliably with a simple structure in which the ratchet pawl 17 is disposed in the recess 18 formed in the cam 11.

  In order to engage the crank arm 15 formed at the distal end of the crankshaft 14 with the cam 11, in the illustrated embodiment, a circular through hole 20 is formed in the base end portion of the cam 11, and the diameter of the through hole 20 is formed in the through hole 20. A connecting ball 21 having a substantially spherical or cylindrical shape having a diameter equal to that of the cam 11 is rotatably mounted on the crank arm 15, and the connecting ball 21 is loosely fitted in the through hole 20 of the cam 11. According to this structure, the crank arm 15 protruding forward and the angle change due to the swing of the cam are absorbed by the rotation of the connecting sphere 21 and the through hole 20, and can be driven smoothly.

  When the nut 5 located in a narrow place such as a recess of the beam material is tightened by using the wrench according to the present invention, as shown by an arrow in FIG. 1, toward the bolt 4 to which the nut 5 is screwed. The nut 5 is fitted into the hexagonal hole 27 by pushing the wrench forward, passing the wrench openings 23, 24, 25 through the bolt 4 in the hexagonal hole 27, and moving the entire wrench in the axial direction. When the crankshaft 14 is rotationally driven in this state, the socket rotates in one direction and the nut 5 is tightened.

  While the socket is driven to rotate, the opening 23, 24, 25 on the front side is not wide enough to pass through the nut, so that the nut 5 passes through the openings 23, 24, 25 and is disengaged. The tightening operation can be continued smoothly. When tightening of the nut is completed, the wrench is moved in the axial direction to release the fitting with the nut 5, and the socket 8 is rotated to take out the wrench by matching the positions of the openings 23, 24, 25. Can do.

The crankshaft 14 is rotationally driven by an electric tool such as an impact driver, and a hexagonal shaft 22 or a socket having a hexagonal hole is disposed at a base end portion thereof.
That is, in the embodiment shown in FIGS. 1 to 3, a hexagonal shaft 22 is formed integrally with the crankshaft 14 at the base end portion of the crankshaft 14, and this hexagonal shaft 22 is fitted into a socket which is a hexagonal hole of the electric tool. And rotate.

On the other hand, in the embodiment shown in FIG. 4, a box 26 having a hexagonal hole 32 into which a driver bit of an electric power tool such as an impact driver is fitted is formed at the base end portion of the crankshaft 14. The box 26 has a driver bit chuck structure. At the base end portion of the crankshaft 14, balls 28 and 28 are arranged in such a manner that a part can be protruded from a small hole penetrating into the hexagonal hole so that the ball 28 protrudes into the hexagonal hole 32. A guide tube 29 having a protruding portion to be pushed out is attached to the base end portion of the crankshaft so as to be slidable in the axial direction. The guide tube 29 is urged forward by a spring 30 so that a part of the ball 28 protrudes into the hexagonal hole 32 in a state where the guide tube 29 is pushed forward, and is engaged with the constricted portion of the driver bit to be prevented from coming off. ing. With the guide cylinder 29 of FIG. 4 pulled toward the front indicated by the arrow against the elastic force of the spring 30, a hexagonal screwdriver bit is inserted into the hexagonal hole 32 and the hand is released from the guide cylinder. Then, the guide cylinder 29 is pushed forward by the spring 30 to prevent the driver bit from coming off.
In FIG. 4, 31 is a collar inserted into the crankshaft 14 and inserted between the crankshaft and the guide tube.

DESCRIPTION OF SYMBOLS 1 ... Column material, 2 ... Beam material, 3 ... Recess, 4 ... Bolt, 5 ... Nut, 6 ... Main body, 7 ... Socket holding hole, 8 socket, 9 ... Socket holding part, 10 ... Middle space, 11 ... Cam, 12 ... Socket holding hole, 13 ... Crank, 14 ... Crank shaft, 15 ... Crank arm, 16 ... Tooth, 17 ... Ratchet claw, 18 ... Recess, 19 ... Spring, 20 ... Through hole, 21 ... Connecting ball 22 ... Hex shaft, 23, 24, 25 ... opening, 26 ... box, 27 ... hexagon hole, 28 ... ball, 29 ... guide tube, 30 ... spring, 31 ... collar, 32 ... hexagon hole.

Claims (5)

In the front part of the main body, a socket holding part that opens the socket holding hole opened forward is formed to hold the socket rotatably,
The socket holding part of the main body is formed by cutting a central portion of the thickness with a certain thickness to form an intermediate space, and a cam that is slidable in the intermediate space is disposed, and the cam is a socket holding of the main body A socket holding hole opened forward is formed in the same way as the part, and the socket holding hole of the main body and the socket holding hole of the cam are penetrated, and an engagement hole for a bolt head and a nut is provided. Place a socket that has been cut out to form an opening,
A crankshaft having a crank at the tip is passed through the main body from the base end toward the intermediate space, and the crank projects a crank arm at an eccentric position away from the axis of the crankshaft. Is engaged with the base end of the cam to swing the cam at a constant angle in conjunction with the rotation of the crankshaft, and a one-way clutch is formed between the cam and the socket,
A wrench driven by an electric tool, wherein the socket is rotated in one direction by rotationally driving the crankshaft.   The one-way clutch formed between the cam and the socket is a combination of teeth at regular intervals provided on the outer peripheral surface of the socket and ratchet pawls meshing with the teeth provided on the inner peripheral surface of the socket holding hole of the cam. 2. The wrench driven by the electric tool according to claim 1, wherein the ratchet pawl is disposed in a recess formed in the cam and is urged by a spring toward an inner socket.   A circular through hole was drilled at the base end of the cam, and a substantially spherical connecting ball having a diameter equal to the diameter of the through hole was attached to the crank arm, and the connecting ball was fitted into the through hole of the cam. A wrench driven by the electric tool according to claim 1 or 2.   The power tool according to any one of claims 1 to 3, wherein a hexagonal shaft is formed at a base end portion of the crankshaft to be fitted to a box of a power tool that is rotationally driven like an impact driver. Wrench to do.   4. A power tool driven by an electric tool according to claim 1, wherein a box for fitting a driver bit of a power tool that rotates like an impact driver is formed at the base end of the crankshaft. Wrench to do.

Images