JPH0733569U - Automatic socket tool - Google Patents

Abstract

(57) [Summary] [Purpose] When removing a nut from a torque shear type bolt used to fasten members in the dismantling of buildings, etc., between the tool fitting part (pin tail) of the bolt and the tool. We provide an automatic socket tool that prevents rust and the like from getting caught and getting stuck. [Structure] The bolt fixing socket 26 of the automatic socket tool 10 is provided with a nut abutting portion 28 that extends to the tip side thereof and abuts on the nut 14 tightened by the bolt 12, so that the nut 14 moves loosely and comes off. As the nut abutment portion 28 is pressed, the bolt fixing socket 26 and the nut fixing socket 30 are moved to the bolt 12.
The second tool fitting portion 24 and the nut 14 can be slid.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic socket tool mainly used for a torque shear type bolt, and more specifically, it has a tool fitting part on its shaft after being tightened with a constant torque, and a nut tightened on the bolt is removed. The present invention relates to an automatic socket tool used for a bolt improved so that it can be used.

[0002]

[Prior art]

 Conventionally, a torque control (torque shear) type bolt whose tightening torque is controlled by breaking the neck portion has been used. This torque shear type bolt has a neck portion formed at the boundary between the screw portion and the tool fitting portion provided at the tip of the screw portion. With this torque shear type bolt, it is possible to tighten with a constant torque by breaking the neck part when a tightening force above a certain level is applied between the tool fitting part and the nut. Has been

However, since the torque shear type bolt completes the tightening by cutting the tool fitting portion, for example, when it is necessary to disassemble an assembly structure or the like, the nut is loosened using the tool fitting portion. I couldn't. Therefore, a torque shear type bolt that can solve this problem has been devised and filed by the present applicant (actual application 1-107789). This bolt is indicated by reference numeral 1 in FIG. The bolt 1 is configured such that the tool fitting portion is 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. Has been done.

As shown in FIG. 7, the bolt 1 has an outer socket (nut fixed socket) 6 of a fastening tool (automatic socket tool) fitted to a nut 2 and a first tool fitting portion 3 The 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. The fastened member 8a and the fastened member 8b are fastened. When the preset tightening torque is reached, the torque is applied between the first tool fitting part 3 and the nut 2, so that the first tool fitting part 3 and the second tool fitting The neck portion 9 provided between the joint portion 5 and the joint portion 5 is torsionally broken, and the fastened member 8a and the fastened member 8b are fastened with a constant torque.

Next, when it is necessary to remove the nut 2 from the bolt 1 for disassembling a structure or the like, as shown in FIG. 8, the inner socket 7 of the fastening tool is attached to the second tool fitting portion. 5, the outer socket 6 of the tightening tool is fitted to the nut 2, and the nut 2 is rotated in the reverse direction while the second tool fitting portion 5 is fixed. Be 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]

[Problems to be solved by the device]

 However, when removing the nut 2 from the bolt 1, the second tool fitting portion 5 is fixed by the inner socket 7 and the nut 2 is rotated in the reverse direction with a strong force. And the inner socket 7 could not be separated. In particular, dismantling of structures is usually done more than one year after the bolts are fastened, so there is no rust on the bolts 1, etc., sand, dust, or paint adheres. If so, the coefficient of friction becomes very high, and it is necessary to rotate the nut 2 in reverse with a very large force. As a result, the second tool fitting portion 5 and the inner socket 7 were caught between them, and the inner socket 7 could not be removed from the second fitting portion 5.

Therefore, the present inventor arrived at the present invention as a result of earnest research to provide an automatic socket tool capable of solving such a problem.

[0008]

[Means for Solving the Problems]

 The gist of the automatic socket tool according to the present invention is a bolt having a tool fitting portion at the tip of the shaft of the bolt after the bolt and the nut have been fastened, and the nut fastened to the bolt. Is equipped with a bolt fixing socket and a nut fixing socket which are fitted to the tool fitting portion of the bolt and the nut, respectively, and is fastened by a reaction force generated between the bolt fixing socket and the nut fixing socket. In the automatic socket tool for loosening the bolt and the nut, the nut abutting portion that extends in the axial direction and abuts the nut fastened to the bolt is provided on the tip side of the bolt fixing socket.

In such an automatic socket tool, the nut contact portion can be attached to and detached from the bolt fixing socket.

[0010]

[Action]

 The automatic socket tool of the present invention has a planetary gear mechanism and the like, and in order to remove the nut tightened on the torque shear type bolt, a reaction force is generated between the tool fitting part of the bolt and the nut, It is a tool for loosening and removing a tightened nut. Normally, the direction in which a reaction force is generated is reversed, and tightening and removal can be performed arbitrarily. Here, the torque shear type bolt is a tool-fitting part that has a cross-sectional shape that allows the tightening tool to fit into the threaded part and regulates rotation, and that is twisted with a predetermined tightening torque. A bolt provided with a neck portion whose minimum outer diameter is set so as to break. The automatic socket tool of the present invention has such a torque shear type bolt that the tool fitting portion is connected to the first tool fitting portion on the open end side and the screw portion by the neck portion. It is formed so that the second tool fitting remains on the shaft of the bolt after the nut is tightened and the first tool fitting is cut at the neck. Used for bolts.

In such an automatic socket tool of the present invention, first, the nut is tightened and the first tool fitting portion is cut to fit the second tool fitting portion of the bolt 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. To be 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 is applied 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 that receives the reaction force, whereby the nut is rotated and at the same time the bolt is moved in the axial loosening direction. On the other hand, since the nut abutment portion provided at the tip of the bolt fixing socket is abutted against the nut, the nut abuts on the nut abutment portion while the nut is rotated and moved. When the nut contact portion is pressed, the bolt fixing socket and the nut fixing socket are slid in the directions of coming out of the second tool fitting portion of the bolt and the nut, respectively. Therefore, even if rust, sand, or the like is attached to the second tool fitting portion, the rust or the like will not be caught between the second tool fitting portion and the bolt fixing socket and will not 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, the second tool fitting is fixed by the bolt fixing socket, so the bolt does not rotate together and the nut is removed from the bolt. In particular, even if the bolt has rust etc., the nut can be removed from the bolt and at the same time, rust etc. will not be caught between the second tool fitting part of the bolt and the bolt fixing socket. Therefore, the automatic socket tool can be easily removed from the bolt.

Further, in the automatic socket tool according to the present invention, the nut abutment portion is configured to be detachable from the bolt fixing socket so that the nut abutment portion can be removed when the nut abutment is not used for removing the nut. By rotating the nut fixing socket in the direction to fasten the nut, it can be used as an ordinary automatic socket tool for fastening. Further, it is possible to prepare nut abutting portions of various lengths and appropriately select and attach a nut abutting portion that can abut the nut according to the length of the shaft portion of the bolt. In other words, it is possible to select and install the one that can come into contact with the nut as appropriate, so that the nut can be securely brought into contact with the nut and the force from the nut can be surely received. It is possible to prevent the engagement portion and the bolt fixing socket from sliding and engaging with each other to prevent separation.

[0015]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 is an automatic socket tool according to the present invention, and is a tool configured so that the nut 14 once fastened to the bolt 12 can be efficiently removed from the bolt 12. . The bolt 12 used here is a torque shear type bolt devised by the present inventor (actual application No. 1-107789), and continues from the screw portion 16 integrally, and is a fastening tool. A torque provided with a tool fitting portion 18 having a cross-sectional shape that allows a socket tool to be fitted to regulate rotation, and a neck portion 20 having a minimum outer diameter set so as to be torsionally broken at a predetermined tightening torque. A shear type bolt, in which the tool fitting part 18 is divided by a neck part 20 into a first tool fitting part on the open end side and a second tool fitting part 24 on the side connected to the screw part 16. It is a bolt that is configured. When the nut 14 is tightened against the first tool fitting portion (not shown) that receives the reaction force, the neck portion 20 of the bolt 12 is torsionally broken by a predetermined torque, and thus the first tool Of the fitting portion and the second tool fitting portion 24, the first tool fitting portion is cut and removed as shown in FIG.

In order to remove the nut 14 fastened to the bolt 12, the automatic socket tool 10 according to the present invention is fitted to the second tool fitting portion 24 of the bolt 12, and the second tool fitting portion The bolt fixing socket 26 for fixing 24 to the nut 14 relatively extends to the tip side of the bolt fixing socket 26, and the tip end portion of the bolt fixing socket 26 comes into contact with the nut 14 fastened to the bolt 12. And a nut fixing socket 30 fitted to the nut 14 fastened to the bolt 12.

In such an automatic socket tool 10, first, the 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. At the same time, the nut fixing socket 30 is fitted to the tightened nut 14. Then, the automatic socket tool 10 is pressed and fitted sufficiently, and further, the nut contact portion 28 provided at the tip of the bolt fixing socket 26 is brought into contact with the surface of the nut 14 for setting. Next, the automatic socket tool 10 is rotated in the normal reverse direction, that is, the nut fixing socket 30 is rotated in the direction in which the nut 14 is loosened. The automatic socket tool 10 includes a planetary gear mechanism and 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. Force is applied between 24 and.

In this way, the bolt 12 is fitted 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. It is fixed so as not to rotate and the nut 14 is rotated. Here, when the nut 14 is not loosened due to rust or the like, a large rotational force is applied to loosen the nut 14. When the nut 14 rotates in the loosening direction, the nut 14 moves in the releasing direction and presses the nut contact portion 28 provided at the tip of the bolt fixing socket 26. As a result, the nut abutting portion 28 pushes back the automatic socket tool 10 as the nut 14 moves in the detaching direction, and the bolt fixing socket 26 and the nut fixing socket 30 are respectively the second tool of the bolt 12 The fitting portion 24 and the nut 14 are slid in the direction of coming out. Therefore, rust or the like is not caught between the second tool fitting portion 24 of the bolt 12 and the bolt fixing socket 26, and it is possible to prevent the two from being separated from each other.

As described above, the nut 14 is loosened by rotating the nut 14 while fixing the bolt 12. Since the second tool fitting portion 24 is still fixed by the bolt fixing socket 26 even after the nut 14 is loosened, 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, the bolt fixing socket 26 is provided with the nut abutting portion 28 that abuts the nut 14, so that the bolt fixing socket 26 is removed from the second tool fitting portion 24 of the bolt 12. The force can be received from the nut 14. Therefore, unlike the conventional automatic socket tool, the bolt fixing socket 26 and the second fitting portion 24 of the bolt 12 are not caught and cannot be separated. Further, even if rust or the like is generated between the bolt 12 and the nut 14 and the frictional force is large, and the nut 14 needs to be rotated with a very large force, the bolt fixing socket 26 and the second fitting are not fitted. Rust or the like will not be caught between the joint portion 24 and the joint portion 24 so as not to be separated.

Although one 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 has a tip portion 44 abutting against the nut 14 having a larger cross-sectional shape than other portions. It is preferably configured to be According to this automatic socket tool, since the cross-sectional area of the tip portion 44 is large, the contact area with the nut 14 can be widened. Therefore, the force from the nut 14 can be effectively received, and the removal from the second tool fitting portion becomes easier.

Further, as shown in FIG. 3, the nut contact portion 52 may 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 it is not used for removing the nut 14, the nut abutting portion 52 is removed and it can be used as an ordinary automatic socket tool for fastening a bolt and a nut.

Further, in the present embodiment, it is possible to prepare a plurality of nut abutting portions having various lengths and appropriately select and attach the nut abutting portion capable of contacting the nut 14. Therefore, it is possible to surely contact the nut 14 according to the length of the shaft portion of the bolt 12, securely receive the force from the nut 14, and secure the bolt with the second tool fitting portion 24 of the bolt 12. It is possible to prevent rust or the like from being caught between the socket 56 and the socket 56 so that the socket 56 cannot be separated.

Further, as shown in FIG. 4, the nut contact portion 62 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. Therefore, it is possible to adjust the length of the nut abutting portion 62 appropriately so as to make sure contact with the nut 14 without preparing a plurality of nut abutting portions as in the above embodiment.

Further, as shown in FIG. 5, the nut contact portion 72 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 adjusted by screwing and fixing the nut contact portion 72 to the bolt fixing socket 74. Therefore, the nut abutting portion 72 can be more surely brought into contact with the nut 14, and the force from the nut 14 can be reliably received.

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

For example, the cross-sectional shape of the bolt fixing socket of the automatic socket tool is not particularly limited, and the bolt fitting socket may be fitted into the tool fitting portion in accordance with the shape of the tool fitting portion of the bolt. Anything that can regulate the rotation of The cross-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 end portion that contacts the nut may be coated to reduce the friction coefficient or a steel member may be attached. It may be reinforced with.

In addition, the present invention can be carried out in a mode in which various improvements, modifications and variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

[0031]

[Effect of device]

 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. By operating the automatic socket tool, the nut can be rotated and easily removed from the bolt. At that time, the automatic socket tool of the present invention has the nut contact portion, and the nut contact portion is brought into contact with the nut, so that the nut is rotated and loosened from the bolt. The nut contact portion receives a pressing force from the nut, and the bolt fixing socket and the nut fixing socket are slid in the directions of coming out from 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 engage with each other and cannot be separated from each other, and further, rust or the like occurs between the bolt and the nut. Even if it is necessary to rotate the nut with a very large force due to the large frictional force, rust etc. will not be caught between the bolt fixing part and the second fitting part and it will not be separated. . Therefore, after removing the nuts from the bolts, there is no need to remove the bolts and nuts from the automatic socket tool, and workability is greatly improved.

Further, the nut abutting 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 abutting portion is removed and a normal bolt and nut are fastened. It can be used as an automatic socket tool for fastening. Also, by preparing a plurality of nut abutting parts of various lengths and appropriately selecting and attaching the nut abutting part, the nut abutting part can be surely contacted with the nut. The force from the nut can be reliably received.

[Brief description of drawings]

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

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

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

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

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

FIG. 6 is a front view showing a Tokrucher type bolt which is a target of the automatic socket tool of the present invention.

FIG. 7 is a front sectional view showing a usage state of the bolt shown in FIG.

8 is a front sectional view showing a usage state of the bolt shown in FIG.

[Explanation of symbols]

 10; Automatic socket tool 12; Torque shear type bolt 14; Nut 16; Screw part 18; Tool fitting part 20; Neck part 24; Second tool fitting part 26, 56, 68, 74; Bolt fixing socket 28 , 42, 52, 62, 72; nut contact portion 30; nut fixing socket

Claims (2)

[Scope of utility model registration request] 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 fastened to the bolt is provided with a bolt fixing socket and a nut fixing socket that are fitted to the tool fitting portion of the bolt and the nut, respectively, and is generated between the bolt fixing socket and the nut fixing socket. In an automatic socket tool for loosening a bolt and a nut fastened by a reaction force, a nut abutting 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. A featured automatic socket tool. 2. The automatic socket tool according to claim 1, wherein the nut contact portion is attachable to and detachable from the bolt fixing socket.