JPH0630369Y2 - wrench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention applies to a square head of a bolt or a square nut, such as a socket wrench, a box wrench, or a socket bit adapted to be attached to a rotary tool. The present invention relates to a wrench that is adapted to be screwed into a bolt with a square head and a square nut by fitting and rotating.

[Conventional technology]

As described above, the wrench fitted to the square head or the square nut of the bolt is a socket bit type which is conventionally attached to a rotary tool, as shown in FIG. At one end, the square head 22 of the bolt 21
It is well known that the wrench 20 has a structure in which an engaging portion 20a for attaching to a rotary tool is formed integrally with the other end of the wrench 20 while forming a square hole 23 to be fitted in. In this case, the cross-sectional area of the square hole 23 is made larger than the cross-sectional area of the square head 22 of the bolt 21 in order to facilitate the fitting and removal of the square head 22.

[Problems to be solved by the device]

However, in this way, the cross-sectional area of the square hole 23 is changed to the bolt 21.
If it is formed to be larger than the cross-sectional area of the square head 22 at, a gap is created between the inner side surface of the square hole 23 and the side surface of the square head 22, and when the bolt 21 is screwed,
As shown in the figure, each inner surface of the square hole 23 and the square head 2
Since the two corner portions 22a of the square head 22 come into line contact with each other, each corner portion 22a of the square head 22 frequently collapses and deforms due to stress concentration.
When the external appearance of the square head 22 deteriorates after being screwed in, or each head 22a of the square head 22 is deformed into a round shape during screwing, the wrench 20
Cannot be engaged with the square head 22, and the bolt 21
Cannot be screwed in, and the screwed bolt 21 cannot be unscrewed.

In particular, a film of synthetic resin or the like may be formed on the square head 22 for the purpose of rust prevention or the like, but since this film is soft and easily deformed, in this case, the above-mentioned problem remarkably appeared.

The present invention aims to provide a wrench that solves these problems.

[Means for Solving the Problems]

To achieve this object, in the present invention, a wrench adapted to be detachably fitted to a square head integrated with a bolt or a square nut screwed with the bolt, wherein the square head or the square A vertical groove extending in the axial direction of the bolt or the square nut is formed in a recess at each of the positions corresponding to the respective side surfaces of the nut.
A pin extending in the direction of the longitudinal groove is fitted in such a manner that the pin can rotate about its axis by a slight angle so as not to fall off, and each of these pins is attached to each side surface of the square head or square nut. It is configured to provide a flat surface portion that abuts.

[Function and effect of device]

In this configuration, by screwing the wrench onto the square head or the square nut of the bolt and rotating the wrench, the bolt with the square head or the square nut can be screwed.

In that case, the flat portion of each pin provided inside the wrench abuts the side surface of the square head or the side surface of the square nut of the bolt, respectively, but since each of these pins can rotate around its axis, As the wrench rotates, the flat surface of each pin comes into close contact with the side surface of the square head or the side surface of the square nut.

When the flat surface of each pin comes into close contact with the side surface of the prismatic head or the side surface of the prismatic nut, the pins are arranged so as to surround the prismatic head or the prismatic head. However, since the close contact state is maintained, screwing can be performed with the wrench securely engaged with the square head or the square nut.

Therefore, according to the present invention, since the wrench can be screwed in while the wrench is securely engaged with the square head or the square nut, the corner portion of the square head or the square nut is crushed and deformed after screwing, and the appearance is deteriorated. It is possible to reliably prevent a problem that the bolt or the square nut cannot be screwed in during screwing, or the screwed bolt or the square nut cannot be removed.

〔Example〕

Next, an embodiment in which the present invention is applied to a wrench for tightening hexagon bolts will be described with reference to the drawings (FIGS. 1 to 8). In the drawings, reference numeral 1 indicates the wrench according to the present invention. An engaging portion 2 having a hexagonal cross-section that engages with a rotary tool (not shown) is formed at one end of the, while a hole 5 to be fitted into the hexagonal head 4 of the hexagon bolt 3 is formed at the other end. A vertical groove 6 having a substantially semicircular cross section that extends in the same direction as the axial center O1 of the bolt 3 is formed in the hole 5 at a position facing each side surface 4a of the hexagonal head 4. A pin 7 having a flat surface portion 7a formed on one side thereof is inserted into each of the grooves 6 in such a manner that the flat surface portions 7a face inward, so that the flat surface portions of these six pins 7 are formed. A hexagonal hole 8 to be fitted into the hexagonal head 4 of the bolt 3 is formed in a portion surrounded by 7a.

In this case, a narrow flat surface 7b that is substantially parallel to the flat surface portion 7a is cut out on the other side portion of each pin 7, while the bottom surface 6a of each vertical groove 6 is formed on the flat surface. Each pin 7
By forming a gap (e) between the flat surface 7b and the bottom surface 6a of the vertical groove 6, each pin 7 has a slight angle (α) in both directions A and B around its axis O2. ) Is configured so that it can only rotate.

Further, the space between the pins 7 facing each other is made slightly larger than the space between the side faces facing each other in the hexagonal head 4, so that the hexagonal head 4 can be easily fitted into and removed from the hexagonal head 4. . Further, the groove width dimension (L) of the opening of each vertical groove 6 is set smaller than the diameter dimension (D) of the small diameter shaft so that each pin 7 does not fall into the hole 5. The pins 7 may be pivotally supported on the wrench 1.

A cap 9 having a bottom plate 9a is detachably screwed to the other end of the wrench 1 as an example of means for preventing the pins 7 from coming off in the axial direction, and the cap 9 is attached to the bottom plate 9a. , Through hole 10 into which the collar 4b of the head 4 of the screw 3 fits
Has been drilled.

In the above configuration, the method of screwing the bolt 3 with the wrench 1 is the same as the conventional method. For example, in the case of the drill screw type bolt 3 as in the embodiment, the engaging portion 2 is engaged with the rotary tool. Then, as shown in FIG. 6, the hexagonal holes 8
Is fitted on the hexagonal head 4 of the bolt 3, and then pressed against the superposed members 11 and 12 while rotating.

In this case, the flat surface 7a of each pin 7 and the side surface 4 of the hexagonal head 4
When a wrench 1 rotates in the direction of arrow C, a gap of a certain size (s) is generated between a and a. First, as shown in FIG. Although it abuts on the edge of the plan view 7a, since each pin 7 is rotatable about its axis O2, each pin 7 rotates about its axis O2 in the direction of arrow B, and FIG. As shown by, the flat surface portion 7a of each pin 7 comes into close contact with the side surface 4a of the hexagonal head 4.

That is, there is a slight angle (β) between the rotation of the wrench 1 and the rotation of the bolt 3, and the pins 7 rotate during this time so that the flat surface portion 7 a of each pin 7 causes the side surface 4 a of the hexagonal head 4 to move. Adheres to.

When the flat surface portion 7a of each pin 7 comes into close contact with each side surface 4a of the hexagonal head 4, the pins 7 regulate each other and cannot rotate. Therefore, the hexagonal head 4 is gripped by these pins 7. In this state, the bolt 3 can be screwed.

In addition, when the wrench 1 is lightly rotated in the direction opposite to the screwing direction C as shown by a dotted arrow D in FIG. 8 after the screwing is completed, one of the flat surface portion 7a of each pin 7 and the curved surface is connected. By contacting the side surface 4a of the hexagonal head 4 with the corner portion 7c, each pin 7 is rotated in the opposite direction to that in the case of the screwing, as shown by the dotted arrow A in FIG.
It will return to the state in which there is a gap between the side surface 4a and the side surface 4a.

In this case, the bottom surface 6a of the vertical groove 6 is shown in FIG.
Each pin 7 by inclining as shown in
However, if the pin 7 is configured so as to rotate only in the direction of the arrow B from the posture in which a gap is formed between the hexagonal head 4 and the side surface 4a of the hexagonal head 4, each pin 7 is provided with its flat surface portion 7a and the side surface 4a of the hexagonal head 4.
It is possible to surely return to the posture in which a gap is formed between the and.

In the above embodiment, the lower end of the cap 9 is located below the lower end of each pin 7 for screwing in the bolt with the collar 4b, but for screwing in the normal bolt 3 without the collar. In the case of a wrench, as shown in FIG. 9, by setting the lower end surface of each pin 7 and the lower end surface of the cap 9 at substantially the same height position, each pin 7 is brought into close contact with the entire length of the hexagonal head 4 in the vertical direction. The means for holding each pin 7 in a non-removable manner is not limited to the cap as in the embodiment, and other means such as pin fixing may be adopted.

In addition, in each of the above-described embodiments, the hexagonal head is fitted, but by changing the number of pins according to the angular number of the rectangular head or the rectangular nut, other angular numbers can be obtained. Needless to say, it can be applied to the square head or square nut of
Further, it goes without saying that the present invention is not limited to the rotary tool or the type in which the handle is rotated as in the embodiment, but can be applied to the type in which the handles are integrally connected.

[Brief description of drawings]

1 to 9 show an embodiment of the present invention, FIG. 1 is an exploded perspective view, FIG. 2 is a front view, FIG. 3 is a bottom view, and FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 5 and 5 are enlarged views of the main parts of FIG.
FIG. 6 shows a screwed state, and FIG. 7 shows VII of FIG.
-VII enlarged cross-sectional view, FIG. 8 is a view showing the operation, FIG. 9 is a cross-sectional view of a main part of another embodiment, FIG. 10 is a perspective view showing a conventional example, and FIG. FIG. 1 ... Wrench, 2 ... Engagement part, 3 ... Bolt, 4 ... Hexagonal head as an example of square head, 6 ... Vertical groove, 7 ... Pin, 7a ... Flat part, 8 ... Hexagon socket, 9 ... Cap.

Claims (1)

[Scope of utility model registration request] 1. A wrench adapted to be detachably fitted to a square head integrated with a bolt or a square nut screwed with the bolt, wherein each side surface of the square head or the square nut of the inside of the wrench. A vertical groove extending in the axial direction of the bolt or the square nut is formed in each of the corresponding places, and a pin extending in the vertical groove direction is formed in each of the vertical grooves. A wrench characterized by being fitted so as not to fall off so that it can rotate by a slight angle, and each of these pins being provided with a flat surface portion that abuts against each side surface of the square head or square nut.