JP2600026Y2 - Automatic socket tool - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic socket tool mainly used for torque shear type bolts, and more particularly, has a tool fitting portion on a shaft portion after being tightened with a constant torque, and tightens the bolt. The present invention relates to an automatic socket tool used for a bolt improved so that a given nut can be removed.

[0002]

2. Description of the Related Art Conventionally, a torque control (torque shear) type bolt in which a tightening torque is controlled by breaking a neck portion has been used. In the torque shear type bolt, a neck portion is formed at a boundary between a screw portion and a tool fitting portion provided at the tip of the screw portion. According to the torque shear type bolt, when a predetermined or more tightening force is applied between the tool fitting portion and the nut, the bolt is broken at the neck portion so that the bolt can be tightened with a constant torque. Have been.

However, this torque shear type bolt is
Since the tightening is completed by cutting the tool fitting portion, the nut cannot be loosened using the tool fitting portion when, for example, it is necessary to disassemble an assembly structure or the like. Therefore, a torque shear type bolt capable of solving this problem has been devised and filed by the present applicant (Japanese Utility Model Application No.
107789). This bolt is indicated by reference numeral 1 in FIG. The bolt 1 has a tool fitting portion divided by a neck portion 9 into a first tool fitting portion 3 on the open end side and a second tool fitting portion 5 on the side connected to the screw portion 4. Have been.

As shown in FIG. 7, an outer socket (nut fixing socket) 6 of a fastening tool (automatic socket tool) is fitted to the nut 2 and a first tool fitting portion 3 An inner socket (bolt fixing socket) 7 of the fastening tool is fitted to the nut, and the nut 2 is rotated while the first tool fitting portion 3 is relatively fixed to the nut 2 so that the nut 2 is rotated. The fastening member 8a and the fastened member 8b are fastened. When a predetermined tightening torque is reached, the torque is applied between the first tool fitting portion 3 and the nut 2, so that the first tool fitting portion 3 and the second tool fitting Torsional fracture at the neck portion 9 provided between the first and second portions 5a and 5b.
Is tightened with a certain torque.

Next, when it is necessary to remove the nut 2 from the bolt 1 in order to disassemble the structure, as shown in FIG. 8, the inner socket 7 of the fastening tool is connected to the second tool fitting portion 5. , The outer socket 6 of the fastening tool is fitted to the nut 2, the nut 2 is rotated in the reverse direction while the second tool fitting portion 5 is fixed, and the nut 2 is loosened. After the nut 2 is loosened, since the second tool fitting portion 5 is fixed by the inner socket 7, the bolt 1 does not rotate together and the nut 2 is removed from the bolt 1.

[0006]

However, when the nut 2 is removed from the bolt 1, the second tool fitting portion 5 is required.
Is fixed by the inner socket 7 and the nut 2
The second tool fitting portion 5
And the inner socket 7 may not be separated. In particular, the dismantling of the structure, etc.
Since most of the years have passed, if the bolt 1 or the like has rust, sand, dust, paint, etc., the coefficient of friction will be extremely high, and the nut 2 It is necessary to reverse rotation with a very large force. For this reason, they bite between the second tool fitting portion 5 and the inner socket 7, and the inner socket 7 cannot be removed from the second fitting portion 5.

[0007] The inventor of the present invention has intensively studied to provide an automatic socket tool capable of solving such a problem, and has arrived at the present invention.

[0008]

The gist of the automatic socket tool according to the present invention is to provide a bolt having a tool fitting portion at the tip of a shaft portion of the bolt after the fastening of the bolt and the nut is completed. A nut fixed to the bolt is provided between the bolt fixing socket and the nut fixing socket, comprising a bolt fixing socket and a nut fixing socket fitted to the tool fitting portion of the bolt and the nut, respectively. In an automatic socket tool for loosening a bolt and a nut fastened by a reaction force, a nut contact portion that extends in the axial direction and abuts on a nut fastened to the bolt is provided at a tip side of the bolt fixing socket. is there.

In the automatic socket tool, the nut contact portion is detachable from the bolt fixing socket.

[0010]

The automatic socket tool of the present invention has a planetary gear mechanism and the like, and generates a reaction force between the tool fitting portion of the bolt and the nut in order to remove the nut fastened to the torque shear type bolt. This is a tool for loosening and removing the tightened nut, and is usually configured so that the direction in which the reaction force is generated is reversed so that tightening and removal can be performed arbitrarily. Here, the torque shear type bolt is integrally formed with a screw fitting portion, and has a cross-sectional shape capable of restricting rotation by fitting a fastening tool, and twisting with a predetermined tightening torque. A bolt having a neck portion whose minimum outer diameter is set so as to be broken. The automatic socket tool according to the present invention includes a torque shear type bolt having a tool fitting portion connected to the first tool fitting portion on the open end and the screw portion by the neck portion. After the nut is tightened and the first tool fitting portion is cut at the neck, the second tool fitting portion is formed so as to remain on the shaft of the bolt. Used for bolts.

The automatic socket tool of the present invention is
First, the nut is tightened and the first tool fitting portion is cut and the bolt is fitted to the second tool fitting portion and the nut. That is, the bolt fixing socket of the automatic socket tool is fitted to the second tool fitting portion of the bolt, and the nut fixing socket of the automatic socket tool is fitted to the nut screwed to the screw portion of the bolt. . At that time, the nut contact portion provided on the tip side of the bolt fixing socket is brought into contact with the surface of the nut.

In this way, the bolt fixing socket and the nut fixing socket of the automatic socket tool are fitted to the bolt and the nut, respectively, and a reaction force acts between the bolt fixing socket and the nut fixing socket. That is,
The nut fixing socket is rotated in the direction in which the nut is loosened with respect to the bolt fixing socket which is a reaction force receiving member, whereby the nut is rotated and simultaneously moved in the axial loosening direction of the bolt. On the other hand, since the nut contact portion provided at the distal end of the bolt fixing socket is in contact with the nut, the nut is rotated and moved, and at the same time, the nut contact portion is pressed by the nut. When the nut contact portion is pressed, the bolt fixing socket and the nut fixing socket are slid in a direction of coming out of the second tool fitting portion of the bolt and the nut, respectively. Therefore, even if rust, sand, or the like adheres to the second tool fitting portion, the rust or the like does not bite between the second tool fitting portion and the bolt fixing socket and cannot be separated.

As described above, the nut is rotated while the bolt is fixed by the reaction force, and the nut is loosened. Even after the nut is loosened, since the second tool fitting portion is fixed by the bolt fixing socket, the bolt does not rotate together and the nut is removed from the bolt. In particular, even if the bolts have rust, etc., the nuts can be removed from the bolts, and at the same time, rust, etc., will not bite between the second tool fitting part of the bolt and the bolt fixing socket. The automatic socket tool can be easily removed from the bolt.

Further, in the automatic socket tool according to the present invention, the nut contact portion is configured to be detachable from the bolt fixing socket, so that when the nut is not used for removal, the nut contact portion is removed and the bolt and the nut are removed. By rotating the nut-fixing socket in the direction of fastening, it can be used as a normal fastening automatic socket tool. In addition, it is possible to prepare nut contact portions of various lengths, and appropriately select and attach a member that can contact the nut according to the length of the bolt shaft portion.
That is, since it is possible to appropriately select and attach a member that can be brought into contact with the nut, the second tool fitting portion of the bolt can be securely brought into contact with the nut and reliably receive the force from the nut. By sliding the bolt and the bolt fixing socket, it is possible to prevent the two from meshing with each other and not being separated from each other.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes an automatic socket tool according to the present invention, which is a tool configured so that a nut 14 once fastened to a bolt 12 can be efficiently removed from the bolt 12. The bolt 12 used here is a torque shear type bolt (Japanese Utility Model Application No. 1-107789) invented by the present inventor. The bolt 12 integrally extends from the screw portion 16 and is fitted with an automatic socket tool as a fastening tool. A torque-shear-type bolt including a tool fitting portion 18 having a cross-sectional shape capable of restricting rotation by being fitted, and a neck portion 20 having a minimum outer diameter set so as to be torsionally broken with a predetermined tightening torque. The tool fitting portion 18 is divided by a neck portion 20 into a first tool fitting portion on the open end side and a second tool fitting portion 24 on the side connected to the screw portion 16. Are bolts. Such bolts 12
When the nut 14 is tightened against a first tool fitting portion (not shown) which is a reaction force receiver, the neck portion 20 is torsionally broken at a predetermined torque. The first tool fitting portion of the second tool fitting portion 24 is cut and removed as shown in FIG.

The automatic socket tool 10 according to the present invention is fitted to the second tool fitting portion 24 of the bolt 12 to remove the nut 14 fastened to the bolt 12,
A bolt fixing socket 26 for fixing the second tool fitting portion 24 relatively to the nut 14, and a nut 14 which extends toward the distal end of the bolt fixing socket 26 and whose distal end is fastened to the bolt 12. It comprises a nut abutting portion 28 adapted to abut, and a nut fixing socket 30 fitted to the nut 14 fastened to the bolt 12.

First, such an automatic socket tool 10 is
A bolt fixing socket 26 is fitted to the second tool fitting portion 24 of the bolt 12 in which the nut 14 is tightened and the first tool fitting portion is cut, and a nut fixing socket is fitted to the tightened nut 14. 30 is fitted. Then, the automatic socket tool 10 is pressed to make a sufficient fit, and a nut contact portion 28 provided at the tip of the bolt fixing socket 26 is set in contact with the surface of the nut 14. Next, the automatic socket tool 10 is rotated in the normal reverse direction, that is, the nut fixing socket 30 is rotated in a direction in which the nut 14 is loosened. The automatic socket tool 10 includes a planetary gear mechanism or the like, and is configured to transmit the reaction force of the rotational force of the nut fixing socket 30 to the bolt fixing socket 26. The nut 14 and the second tool fitting portion 24 Force is applied between.

Thus, the bolt 12 is rotated with respect to the nut 14 by the bolt fixing socket 26 fitted to the second tool fitting portion 24 of the bolt 12 and the nut fixing socket 30 fitted to the nut 14. And the nut 14 is rotated. here,
If the nut 14 is not loosened due to rust or the like, a large rotational force is applied, and the nut 14 is loosened. When the nut 14 rotates in the loosening direction, the nut 14 moves in a direction in which the nut 14 comes off, and presses the nut contact portion 28 provided at the tip of the bolt fixing socket 26. As a result, nut 1
As the nut 4 moves in the direction in which it comes off, the nut contact part 2
8, the automatic socket tool 10 is pushed back, and the bolt fixing socket 26 and the nut fixing socket 30 are slid in a direction to come out of the second tool fitting portion 24 of the bolt 12 and the nut 14, respectively. Therefore, bolt 12
Rust or the like does not bite between the second tool fitting portion 24 and the bolt fixing socket 26, and it is possible to prevent the two from becoming separated.

As described above, the nut 14 is rotated while the bolt 12 is fixed, so that the nut 14 is loosened. Even after the nut 14 is loosened,
Since the second tool fitting portion 24 is still fixed by the bolt fixing socket 26, the bolt 12 does not rotate together and the nut 14 is easily removed from the bolt 12.

According to the automatic socket tool 10 of the present invention,
Since the nut abutting portion 28 that abuts on the nut 14 is provided, the bolt fixing socket 26 can receive a force from the nut 14 in a direction in which the bolt 12 comes out of the second tool fitting portion 24 of the bolt 12. Therefore, unlike the conventional automatic socket tool, the bolt fixing socket 26 and the second fitting portion 24 of the bolt 12 do not bite and remain separated. Further, even when rust or the like is generated between the bolt 12 and the nut 14 and the frictional force is large, it is necessary to rotate the nut 14 with a very large force. There is no possibility that rust or the like is caught between the portion 24 and the portion 24.

Although the embodiment of the present invention has been described above, the automatic socket tool according to the present invention can be implemented in other modes.

For example, as shown in FIG. 2, the nut contact portion 42 provided at the tip of the bolt fixing socket 40 is
It is preferable that the cross-sectional shape of the distal end portion 44 to be brought into contact with the nut 14 is configured to be larger than other portions. According to this automatic socket tool, since the cross-sectional area of the distal end portion 44 is configured to be large, the contact area with the nut 14 can be increased. Therefore, nut 14
From the second tool fitting portion can be more effectively received.

Also, as shown in FIG.
2 may be configured to be detachably attached to the tip of the bolt fixing socket 56 by a screw 54 or the like.
According to this automatic socket tool, when not used for removing the nut 14, the nut contact portion 52 can be removed and used as a normal automatic socket tool for fastening a bolt and a nut.

Further, in the present embodiment, a plurality of nut contact portions having various lengths are prepared, and it is possible to appropriately select a nut contact portion that can come into contact with the nut 14 and mount it.
For this reason, it is possible to reliably contact the nut 14 corresponding to the length of the shaft portion of the bolt 12, securely receive the force from the nut 14, and fix the bolt 12 to the second tool fitting portion 24 of the bolt 12. It is possible to prevent the rust or the like from being caught between the socket 56 and the socket 56 and cannot be separated.

Further, as shown in FIG.
2 may be provided with a plurality of holes 66 into which the screws 64 are inserted. According to this automatic socket tool, the nut contact portion 62 can be expanded and contracted with respect to the bolt fixing socket 68 by appropriately selecting the hole 66 into which the screw 64 is inserted.
For this reason, the length of the nut contact portion 62 can be appropriately adjusted, and the nut 14 can be reliably brought into contact with the nut 14 without preparing a plurality of nut contact portions as in the above embodiment.

Further, as shown in FIG.
2 may be configured to be screwed to the bolt fixing socket 74. According to this automatic socket tool, the length of the nut contact portion 72 can be arbitrarily finely adjusted by screwing and fixing the nut contact portion 72 to the bolt fixing socket 74. For this reason, the nut abutment portion 72 can be more reliably brought into contact with the nut 14, and the force from the nut 14 can be reliably received.

Although the embodiments of the automatic socket tool according to the present invention have been described with reference to the drawings, the automatic socket tool according to the present invention is not limited to the illustrated one.

For example, the sectional shape of the bolt fixing socket of the automatic socket tool is not particularly limited, and the tool fitting portion is fitted to the tool fitting portion in accordance with the shape of the tool fitting portion of the bolt. What is necessary is just to be able to regulate the rotation of. Also, the sectional shape of the nut contact portion is not particularly limited, as long as it can contact the nut over substantially the entire tip portion. Further, the structure of the nut contact portion is not limited to the above-described one, and the tip portion contacting the nut is coated so as to reduce the friction coefficient, or is reinforced by attaching a steel member. May be done.

The present invention can be embodied in variously modified, modified, and modified forms based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[0031]

According to the automatic socket tool of the present invention, the bolt fixing socket is fitted to the second tool fitting portion of the torque-shear type bolt with the nut tightened, and the nut fixing socket is fitted to the nut. In conjunction, by actuating the automatic socket tool, the nut can be rotated and easily removed from the bolt. At this time, the automatic socket tool of the present invention has a nut abutting portion, and the nut abutting portion is abutted against the nut. The contact portion receives a pressing force from the nut, and the bolt fixing socket and the nut fixing socket are slid in a direction coming out of the second tool fitting portion of the bolt and the nut, respectively.
Therefore, unlike the conventional automatic socket tool, the bolt fixing socket and the second fitting portion of the bolt do not mesh with each other and cannot be separated from each other, and furthermore, rust or the like is generated between the bolt and the nut. Even when it is necessary to rotate the nut with a very large force due to a large frictional force, rust or the like does not bite between the bolt fixing portion and the second fitting portion and cannot be separated. . Therefore, there is no need to remove the bolt and nut from the automatic socket tool after removing the nut from the bolt, and the workability is greatly improved.

The nut contact portion is configured to be detachable from the bolt fixing socket, so that when the automatic socket tool is not used for removing the nut, the nut contact portion is removed and a normal bolt and nut are fastened. It can be used as an automatic socket tool. Also, prepare a plurality of nut contact parts of various lengths,
By appropriately selecting and attaching a member that can contact the nut, the nut contact portion can be reliably brought into contact with the nut, and the force from the nut can be reliably received.

[Brief description of the drawings]

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

FIG. 2 is a front sectional view showing another embodiment of the nut contact portion in the automatic socket tool according to the present invention.

FIG. 3 is a front sectional view showing still another embodiment of the nut contact portion in the automatic socket tool according to the present invention.

FIG. 4 is a front sectional view showing still another embodiment of the nut contact portion in the automatic socket tool according to the present invention.

FIG. 5 is a front sectional view showing still another embodiment of the nut contact portion in the automatic socket tool according to the present invention.

FIG. 6 is a front view showing a Tolkshire-type bolt to which the automatic socket tool of the present invention is applied.

FIG. 7 is a front sectional view showing a use state of the bolt shown in FIG. 6;

FIG. 8 is a front sectional view showing a use state of the bolt shown in FIG. 6;

[Explanation of symbols]

 10; automatic socket tool 12; torque shear type bolt 14; nut 16; screw portion 18; tool fitting portion 20; neck portion 24; second tool fitting portion 26, 56, 68, 74; , 42, 52, 62, 72; Nut contact portion 30; Nut fixing socket

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B25B 21/00 510 B25B 21/00 530

Claims (2)

(57) [Scope of request for utility model registration] 1. A bolt having a tool fitting portion at a tip of a shaft portion of the bolt after completion of fastening of the bolt and the nut,
A nut fixed to the bolt is provided between the bolt fixing socket and the nut fixing socket, comprising a bolt fixing socket and a nut fixing socket fitted to the tool fitting portion of the bolt and the nut, respectively. In an automatic socket tool for loosening a bolt and a nut fastened by a reaction force, a nut contact portion that extends in the axial direction and abuts on a nut fastened to the bolt is provided on a tip side of the bolt fixing socket. Features automatic socket tools. 2. The automatic socket tool according to claim 1, wherein the nut contact portion is detachable from the bolt fixing socket.