JP2001287170A - Wrench socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fit a bolt head and a nut onto a fitting hole easily, and to transmit turning force on a socket side to the bolt head and the nut effectively. SOLUTION: The orthohexagonal fitting hole 6 corresponding to the shape of the outer periphery of the bolt head and the nut is provided on the front end of a cylindrical body 2. Arc-shaped runs-off 7 curved in the direction of an outside diameter are provided on the respective corners of the fit hole 6. Six V-shaped grooves 8 are formed in the front end surface of the body 2, and the bottoms 8a of the respective V-shaped grooves 8 are matched with the intersecting point 9 of the respective sides of the fit hole 6 and the runs-off 7. When the bolt head and the nut are displaced from the fit hole 6 in a circumferential direction, the bolt head and the nut are guided to slop of the V-shaped groove 8, and can be engaged with the fitting hole 6 easily. Contact areas between the inner periphery of the fitting hole 6 and the outer peripheries of the bolt head and the nut are large, thus it is possible to transmit the turning force from a wrench socket 1 to the bolt head and the nut effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrench socket used for tightening and loosening bolts and nuts, and particularly to a bolt head and a nut which can be easily fitted together and effectively reduce the rotational force. A wrench socket capable of transmitting.

[0002]

2. Description of the Related Art Hitherto, a wrench socket having a main body having a fitting hole into which a bolt head or a nut whose outer peripheral surface has a polygonal shape is fitted is generally known.

[0003] In the conventional wrench socket, the inner peripheral surface of the fitting hole is formed in a polygonal shape corresponding to the bolt head or the nut, so that the bolt head or the nut and the fitting hole are formed.
If there is a slight displacement in the circumferential direction, the fitting cannot be performed, and there is a problem that the so-called inching rotation must be used in combination, in which the power supply on the wrench socket side is momentarily turned on and fitted.

Therefore, in some cases, for example, Japanese Utility Model 7-444
As shown in Japanese Patent Publication No. 50, the socket can be fitted to the bolt head or nut to be fastened within an allowable range of ± 15 degrees, and the socket can be completely inserted simply by pushing the socket into the bolt head or nut. A wrench socket capable of achieving a proper fitting state has been proposed.

[0005]

By the way, this type of wrench socket is provided with a plurality of protrusions in a fitting hole for facilitating the fitting, and only these respective protrusions are provided on the outer periphery of the bolt head or the nut. The structure is in contact with the surface. For this reason,
The contact area between the mating hole side and the bolt head or nut side is reduced, and when a large rotational force is applied to the mating hole side, the bolt head or nut is damaged and the workability at the next operation is reduced. There are problems such as extreme deterioration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is easy to fit a bolt head or a nut, and can effectively transmit a rotational force to the bolt head or a nut and apply a large rotational force. It is an object of the present invention to provide a wrench socket in which a bolt head and a nut are not likely to be damaged.

Another object of the present invention is to provide a wrench socket capable of smoothly fitting a bolt head or a nut guided by a V-shaped groove into a fitting hole.

It is still another object of the present invention to provide a wrench socket in which a relief portion can be easily processed.

[0009]

According to the present invention, there is provided a wrench socket having a body having a fitting hole into which a bolt head or a nut having a polygonal outer peripheral surface is fitted. While forming the inner peripheral surface of the fitting hole into a polygonal shape corresponding to the bolt head or nut,
A relief portion cut into the outer diameter side is provided at each corner, and a V-shaped groove for guiding the bolt head or the nut into the fitting hole is provided at the tip end surface of the main body. And Then, the V-shaped groove corrects a positional deviation in the circumferential direction between the bolt head or the nut and the fitting hole, thereby enabling easy fitting. In addition, since the bolt head or nut and the fitting hole are almost in contact with each other on almost all sides, the contact area is greatly expanded, and the torque is effectively transmitted to the bolt head and nut. The bolt head and the nut are not likely to be damaged even when a large rotational force is applied.

Incidentally, the deformation of the bolt head or the outer peripheral surface of the nut is more likely to occur at the corners than at the sides. For this reason, if the shape of the outer peripheral surface of the bolt head or nut and the shape of the inner peripheral surface of the fitting hole completely match, fitting becomes impossible even with slight deformation, but In the invention, at each corner of the polygonal fitting hole, a relief portion cut into the outer diameter side is provided, so that deformation can be absorbed by each relief portion, and it is possible to easily fit. Become.

The present invention is also characterized in that the bottom of the V-shaped groove substantially coincides with the intersection between each side of the fitting hole and the relief. Thus, the bolt head and the nut guided by the V-shaped groove can be more smoothly fitted into the fitting hole.

The present invention is further characterized in that the relief portion is formed in an arc shape curved to the outer diameter side. This makes it possible to easily form the relief portion even in post-processing.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a wrench socket according to an embodiment of the present invention. The wrench socket 1 has a main body 2 having a cylindrical shape.
At the base end, a connection hole 3 for connecting to an impact wrench or the like (not shown) and a radial stop pin hole 4 are provided, respectively, and a bolt head 5 shown in FIG. A fitting hole 6 for fitting is provided.

As shown in FIGS. 1 and 2, the fitting hole 6 is formed in a regular hexagonal shape corresponding to the shape of the outer peripheral surface of the bolt head 5, and each corner has an external hexagon. Escape portions 7 that are curved in an arc shape are provided on the radial side, respectively.

As shown in FIGS. 1, 2 and 4, a V-shaped groove 8 for guiding the bolt head 5 into the fitting hole 6 is formed on the distal end surface of the main body 2 in the circumferential direction. It is provided at six locations at equal intervals.

Each of these V-shaped grooves 8 is, as shown in FIG.
The inclination angle θ of the inclined surface from the horizontal direction is set to about 40 degrees, and the bottom 8a of each V-shaped groove 8 is formed with each side 6a of the fitting hole 6 and the relief portion as shown in FIG. It almost coincides with the intersection 9 with 7. Thus, the bolt head 5 can be more smoothly fitted into the fitting hole 6. This will be described later in detail.

Next, the operation of the present embodiment will be described.

When tightening the bolt, as shown in FIG. 5, the main body 2 is brought close to the head 5 of the bolt to be tightened with the fitting hole 6 facing the bolt head 5 side. The part 5 and the main body 2 are brought into contact.

Here, when the bolt head 5 and the fitting hole 6 are perfectly aligned, the bolt head 5 is fitted into the fitting hole 6 as it is. In
Since the bolt head 5 and the fitting hole 6 are generally displaced in the circumferential direction, the corner 5a of the bolt head 5 is formed as shown in FIGS. 6 (a) and 6 (b). 2 V-shaped groove 8 at the end face
Will be in contact with

Then, when the corner 5a of the bolt head 5 comes into contact with the V-shaped groove 8, the main body 2 is pressed against the bolt head 5 while keeping the contact state. Then, a turning force is applied to the corner 5 a of the bolt head 5 by the inclined surface of the V-shaped groove 8,
The bolt head 5 rotates. Alternatively, the main body 2 may be rotated without the bolt head 5 rotating.

By this rotation, the corner 5a of the bolt head 5 is
The position of contact between the V-shaped groove 8 and the bottom 8a of the V-shaped groove 8 gradually increases.
When the contact position reaches the bottom 8a, as shown in FIGS. 7 (a) and 7 (b), each corner 5a of the bolt head 5 falls into the relief portion 7, and The part 5 is completely fitted in the fitting hole 6.

According to the present embodiment, the escape portions 7 are provided at the respective corners of the fitting hole 6, so that even if the corners 5a of the bolt head 5 are deformed, these escape portions are provided. 7, and can be securely and easily fitted.

The bottom 8a of each V-shaped groove 8 has a fitting hole 6
Is substantially coincident with the intersection between each side 6a and the escape portion 7, so that even if the bolt head 5 rotates vigorously due to the inclined surface of the V-shaped groove 8, the corner portion 5a is securely connected to the escape portion 7. And the fitting is extremely smooth.

In the above-described embodiment, the case where the bolt head 5 is tightened has been described. However, the present invention can be similarly applied to the case where the tightened bolt head 5 is loosened. However, when the bolt head 5 is loosened, the bolt head 5 does not rotate even if the bolt head 5 comes into contact with the V-shaped groove 8.
Rotates, and the same effect can be obtained.

In the above-described embodiment, the case where the present invention is applied to the bolt head 5 has been described. However, the present invention can be similarly applied to a case where a nut is tightened or loosened. In addition, the bolt head 5 or the nut is not limited to the case where the outer peripheral surface shape is a regular hexagon, but may be applied to a case where the shape is, for example, a regular square, and the same effect can be obtained.

[0027]

As described above, the present invention relates to a wrench socket provided with a main body having a fitting hole into which a bolt head or a nut having a polygonal outer peripheral surface is fitted. The peripheral surface is formed in a polygonal shape corresponding to the bolt head or nut, and at each corner thereof, a relief portion cut into the outer diameter side is provided, and the bolt head or nut is fitted to the tip end surface of the main body. V to guide to the hole
Since the groove is provided, the positional deviation in the circumferential direction between the bolt head or the nut and the fitting hole is corrected by the V-shaped groove, so that the fitting can be easily performed.

Also, since the bolt head or nut and the fitting hole are almost in contact with each other on almost all sides,
The contact area is greatly enlarged, the torque can be effectively transmitted to the bolt head and the nut, and even if a large torque is applied, the bolt head and the nut are not likely to be damaged.

Further, since the fitting hole having a polygonal shape has a relief portion cut into the outer diameter side at each corner thereof, even if the bolt head and the outer surface of the nut are slightly deformed, the shape of the fitting hole becomes small. The deformation is absorbed by the relief portion, and the fitting can be easily and reliably fitted into the fitting hole.

In the present invention, since the bottom of the V-shaped groove is set so as to substantially coincide with the intersection between each side of the fitting hole and the relief, the bolt head guided by the V-shaped groove and The nut can be more smoothly fitted into the fitting hole.

Further, according to the present invention, since the relief portion is formed in an arc shape curved to the outer diameter side, the relief portion can be easily formed even by post-processing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a wrench socket according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a perspective view of FIG. 1;

FIG. 5 is an explanatory view showing an operation when a bolt is tightened using a wrench socket.

6A is an explanatory view showing a state in which a bolt head abuts on a V-shaped groove, and FIG. 6B is a plan view of FIG.

7A is an explanatory view showing a state in which a bolt head is fitted in a fitting hole, and FIG. 7B is a plan view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wrench socket 2 Main body 5 Bolt head 6 Fitting hole 7 Relief part 8 V-shaped groove 8a Bottom part 9 Intersection

Claims (3)

[Claims] 1. A wrench socket having a main body having a fitting hole into which a bolt head or a nut having a polygonal outer surface is fitted, wherein the fitting hole has an inner peripheral surface of the bolt head or the nut. Is formed in a polygonal shape conforming to the above, and at each corner thereof has a relief portion cut into the outer diameter side, and the main body guides the bolt head or nut to the fitting hole at the tip end surface thereof. A wrench socket having a V-shaped groove for mounting. 2. The wrench socket according to claim 1, wherein the bottom of the V-shaped groove substantially coincides with the intersection of each side of the fitting hole and the relief portion. 3. The wrench socket according to claim 1, wherein the relief portion has an arc shape curved to the outer diameter side.