JP2008142794A - Fastening tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening tool preventing a fastening object from being damaged, or hardly damaging the object even just before completion of fastening by the fastening tool. <P>SOLUTION: The fastening tool is provided with: a socket 11 fitted into a head part of a bolt 43 or the like and engaging with it in the direction of rotation to fasten the bolt 43 or the like on a mating face 39 by rotation of the socket 11; and a resin-made cover 25 rotatable relatively and freely for the socket 11 to prevent the resin-made cover 25 from turning together with the socket 11 for rotation of the socket 11 when fastening the bolt 43 and a nut 45. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fastening tool for fastening a fastener such as a bolt or a nut to a mating surface.

Conventionally, there is an impact wrench as one of the fastening tools. The impact wrench includes a driver having a driving member such as a motor, and a socket having an insertion portion corresponding to the shape of the fastener and configured to be detachable from the driver. In order to perform, for example, a bolt fastening operation using such an impact wrench, a socket suitable for the size of the bolt to be fastened is used. Specifically, when tightening and fixing an object to be fastened to a fastening partner with a bolt and a nut, first turn the bolt by hand and fix it to the nut to some extent, and then insert a socket into the head of the bolt in the tightening direction. Rotate and tighten the bolt against the nut.

  However, in the tightening operation of the fastener using such a conventional impact wrench, the socket tends to come into contact while rotating in a state of being pressed against the object to be fastened, and the surface of the object to be fastened is painted. There is a drawback that scratches.

JP 2006-68873 A JP 2006-82189 A

  The problem to be solved is that in the work using the conventional impact wrench socket, the fastening object is damaged immediately before the fastening of the fastener is completed.

  The present invention provides a fastening tool that does not damage or hardly damages an object to be fastened even when the fastening of the fastener is completed. In the fastening tool for fastening the fastener to the mating surface by rotation of the socket, a resin cover that is relatively rotatable with respect to the socket is provided on at least the front surface of the socket facing the mating surface. The most important feature.

  The fastening tool of the present invention includes a socket that is engaged with the head of a fastener and engages in the rotational direction, and the fastening tool fastens the fastener to a mating surface by the rotation of the socket. Since the resin cover that is relatively rotatable with respect to the socket is provided on the front surface facing the mating surface, when the fastener is tightened, the resin cover is prevented from rotating together with the rotation of the socket, and the object to be fastened is damaged. The fastener can be tightened without any problem. As a result, it is possible to provide a fastening tool that does not damage the object to be fastened even just before the fastening of the fastener is completed.

  The object of providing a fastening tool that does not damage or hardly damages the object to be fastened even when the fastening of the fastener is completed is realized by a resin cover capable of relative rotation.

  Hereinafter, a preferred embodiment of an impact wrench socket according to the present invention will be described in detail with reference to the drawings.

  1 (a) and 1 (b) are two views showing an embodiment of an impact wrench socket according to the present invention, FIG. 1 (c) is a sectional view of a socket cover, and FIG. 2 uses the socket according to the present invention. It is a figure which shows a bolt fastening state.

  As shown in FIGS. 1 and 2, a socket 11 for an impact wrench as a fastening tool according to an embodiment of the present invention is made of a metal material such as iron or special steel, and has an axial center on one end side. An insertion portion 13 into which a bolt head or a nut can be inserted is formed, and a connection portion 17 of the transmission member 15 is formed on the other end side. The socket 11 is provided with a small-diameter portion 12 having a smaller diameter than the outer peripheral surface on the rear side with respect to the mating surface that is the surface of the object to be fastened while the outer peripheral surface is formed in a circular shape in cross section.

  The socket 11 is configured to be attachable to and detachable from an impact wrench 19 having a built-in drive motor (not shown), whereby a fastener such as a bolt or a nut can be tightened. In the socket 11, the sizes of bolts and nuts are not limited, and are applied to a socket of any size that is mounted on and driven by the impact wrench 19, and a fastening tool that integrally includes the socket other than the impact wrench 19. Is possible.

  The insertion portion 13 is formed in a hexagonal shape corresponding to the shape of the head of the bolt and the nut, and the depth of the insertion portion 13 accommodates the height of the head of the bolt or the thickness of the nut that is expected to be used. It is formed with dimensions that are possible. The cross-sectional shape of the insertion portion 13 can be a shape such as a chrysanthemum shape having 12 or 18 corners other than the hexagonal shape corresponding to the shape of the bolt head or nut. is there.

  The transmission member 15 has a function of detachably connecting the socket 11 to the impact wrench 19 and transmitting a driving torque of the impact wrench 19 to the socket 11. For this reason, the transmission member 15 is not particularly limited as long as it has the above function. In this embodiment, a transmission member 15 having a rectangular cross section that is generally used for a normal impact wrench is employed.

  The connecting portion 17 is a part that is connected to the impact wrench 19 via the transmission member 15 and to which the drive torque from the impact wrench 19 is transmitted. For this reason, it is formed with a rectangular shape corresponding to the shape of the transmission member 15. In attaching the transmission member 15 to the connection portion 17, after inserting the transmission member 15 into the connection portion 17 of the socket 11, both are inserted into the through hole 21 provided in the socket 11 and the through hole provided in the transmission member 15. This is done by inserting a pin (not shown) in a penetrating state and hanging an O-ring (not shown) for pin removal in a circumferential groove 23 on the socket 11 crossing the through hole.

  In the socket 11 configured as described above, the resin cover 25 is provided with a slight gap from the socket 11 in order to prevent the object to be fastened from being damaged even when the fastening of the fasteners such as bolts and nuts is completed. It is.

That is, the outer peripheral surface 27 of the socket 11 is formed in a circular cross section, and the socket 11 is provided with a substantially cylindrical resin cover 25 that integrally covers the outer peripheral surface 27, the lower end surface (front surface) 29, and the upper end portion 33. A small gap is provided.
Accordingly, at least the front surface (lower end surface 29) of the socket 11 facing the mating surface that is the surface of the object to be fastened is provided with a resin cover 25 that is rotatable relative to the socket 11. The shape of the resin cover 25 can be freely set as long as it covers the lower end surface 29 and can rotate relative to the socket 11.
The resin cover 25 includes a cylindrical portion 26 that is loosely fitted to the outer peripheral surface 27, an abutting inner peripheral flange portion 35 that can abut against the mating surface, and an engagement inner periphery that engages with the small diameter portion 12 so as to be relatively rotatable. And a flange portion 28.

  The balance of the frictional force between the lower end surface 29 of the socket 11 and the abutting inner peripheral flange portion 35 and the frictional force between the abutting inner peripheral flange portion 35 and the mating surface when the fastener is tightened by the rotation of the socket 11. For example, when the resin cover 25 comes into contact with the mating surface, the rotation of the resin cover stops and the resin cover 25 is prevented from rotating together with the rotation of the socket 11.

  In attaching the resin cover 25 to the socket 11, first, the resin cover 25 is softened and expanded by heating with hot water or a high-temperature dryer.

The softened and expanded resin cover 25 is fitted into the socket 11 and set so that the engagement inner peripheral flange portion 28 can be engaged with the small diameter portion 12 by subsequent cooling. In this state, the contact inner peripheral flange portion 35 faces the lower end surface 29.
Thus, the resin cover 25 attached to the socket 11 does not come out of the socket 11 when cooled, so that the resin cover 25 is provided on the socket 11 with a slight gap from the socket 11. As a material of the resin cover 25, for example, Duracon, preferably MC nylon, and more preferably high molecular weight polyethylene is suitably used.

Using the impact wrench socket 11 according to the embodiment of the present invention configured as described above, the fastened object 37 is fastened and fixed to the fastening counterpart 41 by the impact wrench 19 with the bolt 43 and the nut 45.
First, the socket 43 is inserted into the bolt 43 while turning the bolt 43 by hand and fixed to the nut 45 to some extent, and the folded portion outer side 39 of the resin cover 25 is pressed against the fastened object 37 to rotate the socket 11 while rotating the socket 11. tighten.

  According to the present embodiment, when the fasteners 43 and 45 are tightened using the impact wrench 19, even when the socket 11 is rotated in a state of being pressed against the article to be fastened 37, Since the resin cover 25 does not rotate together with the rotation of the socket 11 at the time of tightening, the fasteners 43, without damaging the coating surface of the mating surface 39 that is the surface of the object 37 to be fastened or reducing damage. 45 can be tightened. As a result, it is possible to provide the impact wrench socket 11 that does not damage the fastening object 37 even when the tightening of the bolts and nuts 43 and 45 is completed, or reduces damage.

(A) is a front view of the socket for impact wrench, (b) is the side view, (c) is sectional drawing of a resin cover. It is effect | action explanatory drawing which shows the bolt fastening state using a socket.

Explanation of symbols

11 Socket (fastening tool)
19 Impact wrench (fastening tool)
25 Resin cover 27 Outer peripheral surface 28 Engagement inner peripheral flange 29 Lower end surface (front surface)
31 Outer perimeter 33 Upper end 35 Abutting inner peripheral flange 37 37 Fastened object 39 Mating surface 43 Bolt (fastener)
45 Nut (fastener)

Claims (4)

In a fastening tool comprising a socket engaged with the head of the fastener and engaged in the rotational direction, and fastening the fastener to the mating surface by rotation of the socket,
At least the front surface of the socket facing the mating surface is provided with a resin cover that is rotatable relative to the socket.
Fastening tool characterized by that. The fastening tool according to claim 1,
The socket has an outer peripheral surface formed in a circular cross section, and has a small diameter portion smaller in diameter than the outer peripheral surface on the rear side with respect to the mating surface,
The resin cover includes a cylindrical portion that is loosely fitted to the outer peripheral surface and an engagement inner peripheral flange portion that is engaged with the small diameter portion so as to be relatively rotatable so as to be prevented from coming off.
Fastening tool characterized by that. The fastening tool according to claim 1 or 2,
The socket is detachably attached to the impact wrench.
Fastening tool characterized by that. The fastening tool according to claim 2 or 3,
The resin cover is heated to soften and expand,
The softened and expanded resin cover is fitted into the socket,
Set so that the engagement inner peripheral flange portion can be engaged with the small diameter portion by subsequent cooling,
A method for assembling a fastening tool.

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