JP2604975Y2 - spanner - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrench capable of efficiently performing a tightening operation or a loosening operation of a bolt or a nut to be tightened in a narrow place where only a wrench can enter.

[0002]

2. Description of the Related Art Conventionally, a wrench has been used as a tool for tightening or loosening screws such as bolts and nuts, and such a wrench has a relatively flat shape.
The work location for tightening or loosening the screw is suitable for screwing work in a narrow place.

However, when the rotation of the wrench is restricted due to obstacles during screwing using such a wrench, the wrench is once detached from the heads of the bolts at every fixed angle rotation of the wrench. Thereafter, the wrench was inserted into the head again to perform the tightening operation. For this reason, there was a problem that workability was extremely poor and productivity was reduced.

In order to solve such a problem, for example, a wrench having a structure as shown in FIG. 1 has been proposed. That is, the bulging part 3 formed at the tip of the handle part 2 of the spanner 1
For inserting a hexagonal head such as a bolt and nut 4
A letter-shaped holding portion 5 is formed. Further comprising a pair of opposing walls 6 and 7 to the gripping portion 5, the distal end portion near the other opposed wall 7 is obtained by forming a relief portion 8.
To tighten a bolt and nut 4 (hereinafter simply referred to as a screw) using the spanner 1, for example,
Fitted between the opposing walls 6 and 7, in the subsequent shank 2 figures, performs the tightening of the screw rotates in the E direction. Further, in the case where the spanner 1 is returned intermittently (alternately) and the intermittent tightening operation is performed at the time of the screw tightening operation by the spanner 1, the spanner 1 is slightly retracted in the L direction and the one wall 7 is retracted.
When the handle 2 is released from contact with the screw head (see FIG. 2) and the handle 2 is rotated in the direction G in the figure, the wrench 1 can be easily returned (idle motion). (Pattern 2
By repeating the forward movement E and the backward movement G), the screw can be tightened.

[0005]

However, there is a disadvantage in the spanner having such a structure. That a width between one opposing walls 6,7 spanner, between each side of the hexagonal screw head, in order to be able to make easily added spanner on the hexagonal screw head, the screw head and spanner Each spanner is designed so that there is a gap between the wrench and the dimensional tolerance.

Because of this gap, when the screw is tightened by the spanner having the structure shown in FIG. 1, the corners e and a of the hexagonal head are in contact with one of the opposing walls 6 of the spanner 1 and the first.
The boundary point c of the back wall 9 and the first back wall 9 and the second back wall 10
From the boundary point b, it slides by n in the direction of the first back wall 9 and the second back wall 10. The occurrence of this slip causes the spanner 1 to move in the L direction.
In order is pushed, threaded hexagonal surface and reduced by contact surface length m of the other opposed wall 7 of the spanner, thereby especially at the time of tightening operation screw spanner of the other opposed wall 7 and the screw The contact surface (holding surface) with the hexagonal surface becomes smaller , for example
As shown in FIG. 2, there is a problem that the engagement between the screw head surface and the spanner is easily released.

The present invention has been made in view of such a problem, and when a screw is tightened with a spanner, the connecting (engaging) force between the spanner and the screw head is securely held to tighten the screw. it is an object to provide a Elaborate wrench to be able to perform work smoothly and reliably.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In the claims of the present invention, a hexagonal screw head
Two opposing walls parallel to each other, and the inner ends of both opposing walls
From the angle of 120 degrees with respect to the wall surface of both opposing walls
Having first and second inner walls adjacent to each other,
A relief is provided at the tip of the other opposing wall adjacent to the back wall of No. 2.
In the provided wrench, one of the pairs without the relief
A first boundary point c between the facing wall and the first back wall, a first back wall
The second boundary point d and the second back wall,
A song circumscribing any of the boundary points f formed by the other opposing wall
Along the arc drawn with the radius of curvature R, the first boundary point
Extending from the first back wall to a substantially middle corresponding position of the first back wall.
A curved surface, an extended end of the first curved surface, and the first back wall.
And a second curved surface connecting the intermediate position with a corner radius R '.
A curved concave portion is formed in the first back wall, and is formed on the arc.
A substantially middle pair along the second boundary point from the second boundary point
A first curved surface extending to a corresponding position and a first curved surface
Connects the extended end to a substantially intermediate position of the second inner wall at a corner R '
A curved concave portion formed by the second curved surface is formed on the second inner wall.
The radius of curvature R is defined as the distance between the opposing surfaces of the hexagonal screw head.
When the dimension between them is r , the spanner must be R = r / cos30 ° × 1/2.
It is characterized by.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS. 3 and 4. The same parts of the structure of the present embodiment and the structure described in the conventional example are used in the conventional example. The same reference numerals are given, and the description of the structure of the same structure is omitted.

That is, in the present embodiment, the first back wall 9 and the second back wall 10 located between the pair of opposing walls 6 and 7 formed on the screw holding portion 5 of the spanner are formed . Each
Those that are characterized by forming a curved recess 11 in Les.

Hereinafter, the application position of the curved concave portion 11 and the curved concave portion 11 will be described.
Is specifically described with reference to FIG. First
The application position of the curved concave portion 11 to the first back wall 9 is one pair.
From a first boundary point C formed by the facing wall 6 and the first back wall 9,
Is formed over the middle of the first back wall 9 of the
The application position of the curved concave portion 11 to the rear wall 10 of the second
From a second boundary point d formed by the wall 9 and the second back wall 10,
Of the second inner wall 10.

The curved concave portion 1 provided on the first back wall 9
As shown in FIG. 4, the shape of the first boundary point c and the first boundary point c
And the second boundary point d, the second inner wall 10 and the other opposing wall 7
Can be drawn with a radius of curvature R circumscribing any of the boundary points f with
Along the arc 12 and a first depth from the first boundary point.
First curved surface 1 extended to a substantially intermediate corresponding position of wall 9
3, the extended end of the first curved surface 13 and the first back wall.
A second curved surface 14 connecting the substantially middle position with a corner radius R ';
Formed along.

The radius of curvature R is determined by using the spanner of the present invention.
Between the opposing surfaces of the hexagonal screw head that is screwed to the workpiece
Assuming a dimension r, R = r / cos 30 ° × １ ／.

A curved concave portion provided on the second back wall 10
The shape of 11 is on the arc 12 in the same manner as described above, and
A substantially middle corresponding position of the second back wall 10 from the second boundary point d.
A first curved surface 13 extending over the first curved surface;
13 and an approximately middle position of the second inner wall.
And formed along the second curved surface 14 which is connected by the rule R '.

A corner forming a part of the curved concave portion 11
The curvature of the radius R 'is not particularly limited, and
The less stress concentration occurs when tightening screws with a panner
Formed on a curved surface of degree, that is, not to cause corners
Any material can be used as long as it can be formed.

As described above, as shown in this embodiment, from the end of the first back wall 9 of the spanner on the side of the one opposing wall 6.
In the middle, the first back wall 10
Formed along the above curved surface from the back wall side end to the middle
Since the wrench having the respective curved concave portions 11 formed is used, when the screw 4 having a hexagonal screw head is to be fastened to a tightened body by the wrench, each side of the hexagonal screw head and the grip of the wrench are required. even if the dimension tolerances Sunawa Chi while chink that occurs not occur between the opposing walls 6 and 7 in section 5, its
The corners a and e of the hexagonal screw head in the wrench during idling screw tightening by the form to the first back wall 9 and the second rear wall 10
In order to penetrate into the curved concave portion 11 formed,
When tightening the hexagonal screw head meshing screw with a spanner ,
Push the spanner 1 back in the L direction by the corners a and e.
The tour de force for which the not generated, thus meshing force of the hexagonal screw head by a pair of opposed walls 6,7 of the wrench is secured, thereby clamping the work of the screw 4 has a feature that smoothly and reliably performed.

[0017]

According to the invention effects] wrench according to the present invention as described above and the sides of the hexagonal bolt head is to be fastened screws, may have a gap by dimension tolerance between the gripper surfaces of the wrench, its
Engagement force of the hexagonal screw head by a pair of opposed walls 6,7 of the wrench Ru is ensured. In addition, at the time of reversal (return) work of spanner,
By the action of the escape portion 8 formed on the other opposing wall 7,
The engaging force between the spanner and the hexagon bolt head is easily released,
Screw tightening while reciprocating turning the wrench by these effects
Thus, there is an effect that the fastening operation of the screw 4 for performing the tightening can be performed smoothly and reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional spanner.

FIG. 2 is a diagram illustrating the operation of a conventional spanner.

FIG. 3 is an explanatory view of a spanner according to the embodiment of the present invention.

FIG. 4 is an enlarged explanatory view of a main part structure of the spanner according to the embodiment of the present invention.

[Explanation of symbols]

 11: curved concave portion 12: arc 13: first curved surface 14: second curved surface

Claims (1)

(57) [Scope of request for utility model registration] 1. Two opposing walls which are parallel to each other for holding a hexagonal screw head, and are installed adjacent to the wall surfaces of both opposing walls at an angle of 120 degrees from the inner ends of the opposing walls. First and second inner walls, further comprising the second inner wall
And a wrench provided with a relief at the tip of the other opposing wall adjacent to the first and second opposing walls.
A first boundary point (c) composed of the first inner wall and the first inner wall;
A second boundary point (d) formed by the second back wall and the second back wall;
Circumscribe any of the boundary points (f) between the other opposing wall
Along the arc drawn with a radius of curvature (R)
It extends from the boundary point to the substantially middle corresponding position of the first back wall.
A first curved surface, an extended end of the first curved surface, and the first curved surface.
The second song that connects the back wall with the approximate middle position with a corner radius (R ')
A curved concave portion (11) formed by the surface is formed in the first back wall.
And along the arc and from the second boundary point
A first extending toward a substantially middle corresponding position of the second back wall;
A curved surface, an extended end of the first curved surface, and a substantially intermediate portion between the second back wall
A bay formed by a second curved surface connecting the position with a corner (R ')
A curved recess (11) is formed in the second inner wall, and the curvature
The radius (R) is the dimension between the opposing faces of the hexagonal screw head.
A wrench characterized by the following formula : R = r / cos30 ° × １ ／ .