JPH0649912A - Fastener and clamping tool - Google Patents

Abstract

PURPOSE:To make it possible to obtain a strong tightening force as in the clamps which use a bolt and a nut and confirm easily if clamping operation is being carried out or not, and to enhance work efficiency. CONSTITUTION:A nut main body 4 comprises a first clamping part 8 which has a cylinder-shaped part with a larger size than an outer diameter of a bolt on the inner peripheral part and a second clamping part 10 which has a female screwed part threaded with the bolt 2 on the peripheral part and a connecting part 12 which connects both the first clamping part 8 and the second clamping part 10, which share a shaft center 11. The connecting part 12 is constituted by forming a 13 around the nut main body 4. When clamping force is applied beyond a fixed value, the nut will be twisted out so that it may be divided into the first clamping part 8 and the second clamping part 10, thereby releasing the connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastener used to fasten vertically connecting end portions of hollow pillars arranged at four corners when vertically stacking building units constituting a unit building. .

[0002]

2. Description of the Related Art As a conventional fastener, a fastener composed of a bolt and a nut is well known. In these fasteners, there is no problem in the tightening workability at the location where the head of the bolt and the grip of the nut are exposed on the surface.

However, for example, when stacking building units constituting a unit building up and down and used to fasten the upper and lower connecting ends of hollow pillars arranged at the four corners, the heads of bolts and Since the grip portion of the nut is in the hollow column, it cannot be tightened with a normal tightening tool such as a wrench. If the opening for inserting the wrench is formed on the side surface of the column, the structural strength is impaired and there is a practical problem.

Therefore, a tool having a long handle, such as the tightening tool disclosed in Japanese Patent Laid-Open No. 50-147113, is inserted from the upper part of the upper pillar to tighten the head of the bolt or the grip of the nut. It was

[0005]

By the way, in the step of tightening fasteners such as bolts and nuts using a conventional tightening tool having a long handle, it is possible to temporarily fix the nut by simply looking into the nut from above the upper pillar. It was difficult to judge whether it was in this state or whether it was tightly tightened, and it was necessary to reinsert the tightening tool into all the columns many times to check, and work efficiency was not good.

Further, as in the joint structure disclosed in Japanese Patent Laid-Open No. 61-45044, there is also known a method in which a guide pin attached to the upper surface of a lower pillar is rotated and locked in the upper pillar. ing. However, with this method, it is impossible to obtain a strong tightening force as with a fastener using bolts and nuts, rather than merely locking.

Therefore, an object of the present invention is to obtain the same strong tightening force as a fastener using general bolts and nuts, and to easily confirm that the tightening is performed, and to fasten the fastener with good working efficiency. To provide the ingredients.

[0008]

In order to solve the above problems, the present invention is a fastener having a bolt and a nut, wherein the nut has a diameter larger than the outer diameter of the bolt on the inner circumference. A first gripping portion having a groove-shaped portion, a second gripping portion having an internal thread portion that is screwed into the bolt on the inner circumference, and the axes of the first gripping portion and the second gripping portion are aligned together And a connecting portion which is connected to each other. The connecting portion is characterized by a fastener that releases the connection when a tightening force of a certain value or more is applied.

Further, the present invention is characterized by a tightening tool having a socket having a depth for gripping either one of the first grip portion and the second grip portion.

In the fastener and the tightening tool for connecting the ends of the tubular member, the first gripping portion is fixed to the socket by a set screw in the tubular member on the nut side. The fastening tool and the fastening tool are characterized in that the fastening tool is provided and a pull-out prevention piece that is engaged with the inside of the tubular member is provided in the second grip portion.

[0011]

In the fastener constructed as described above, the first grip portion of the nut is gripped by the tightening tool and screwed into the bolt which is fixed in advance. Therefore, the member interposed between the bolt and the nut is joined by a tightening force that is about the same as the conventional bolt and nut.

Even before attempting to pull out the tightening tool from the tubular member before joining, the pull-out preventing piece is locked inside the tubular member and cannot be pulled out.

After joining, when the tightening force of the tightening tool is further increased, the connecting portion releases the connection between the first grip portion and the second grip portion. For this reason, the first gripping portion comes out of the bolt, and only the second gripping portion remains screwed to the bolt. Since the pull-out prevention piece is arranged in the second grip portion, the tightening tool can be pulled out from the tubular member, and it can be confirmed that the tightening is completed.

[0014]

1 to 3 show an embodiment of the present invention.

The fastener 1 of this embodiment includes a nut body 4,
Nut tool 3 having washer 5 and washer collar 6
And the bolt 2 mainly.

The nut body 4 has an inner circumference on which the bolt 2 is attached.
First gripping portion 8 having a tubular portion 7 having a diameter larger than the outer diameter of
A second grip 10 having an internal thread 9 that is screwed into the bolt 2 on the inner circumference, and the first grip 8 and the second grip 10.
And a connecting portion 12 for connecting the shaft center 11 in common.

A flange portion 29 is formed on the first grip portion 8 so as to extend above the hexagonal grip portion main body.

A flange portion 30 is formed on the first grip portion 10 so as to extend below the hexagonal grip portion main body.

The connecting portion 12 has a groove 13 formed around the center of the nut body 4, and has a first grip portion 8 and a second grip portion 1.
It is configured by providing a portion for reducing the torsional rigidity as compared with 0. Then, when a tightening force of a certain value or more is applied, the groove 13 is completely twisted, and the first grip portion 8 and the second grip portion
It is divided into a grip portion 10 and is set to release the connection.

The twisting value of the connecting portion 12 is set to a value larger than the value required to fix each member with the bolts 2 and the nut tools 3, and moreover, the value which the operator can twist sufficiently. ing.

The washer 5 has a disk shape having a bolt insertion opening at the center.

The washer 5 is arranged below the second grip portion by the washer collar 6 which is locked to the lower end of the second grip portion 10.

The washer collar 6 has a plurality of locking claws 14 projecting inward and a plurality of pull-out preventing pieces 1
5 is arranged facing outward.

The locking claw 14 is hooked on the flange portion 30 of the second grip portion 10.

This fastener 1 is a pillar 16 as a tubular member arranged at the four corners of a building unit which constitutes a unit building.
The manner in which the upper and lower end portions 17 and 18 are fastened will be specifically described.

The pillar 16 has a hollow elongated shape, and a tightening tool 19 is provided therein.

The pillar 16 has a plurality of partitions 2 inside.
3 is formed. The tightening tool 19 is attached to the partition wall 23.
An insertion hole 24 is formed to insert the. This insertion hole 2
4 has a size such that the tightening tool 19 can be inserted therethrough and the pull-out preventing piece 15 of the washer collar 6 is locked.

The tightening tool 19 has a handle 21 mainly longer than the length of the pillar 16, a grip portion formed on the upper end of the handle 21, and a grip portion protruding from the upper end 17 of the pillar 16 and the handle 21. The universal joint 22 is extended, and the socket 20 is disposed at the tip of the universal joint 22 and holds the first holding portion 8 of the nut body 4 and is mainly configured.

The depth of the socket 20 is set to a depth for gripping either the first grip portion 8 or the second grip portion 10. By screwing the side wall of the socket 20 from the outside of the socket 20, the socket 20
A plurality of setscrews 28, the tips of which project toward the inner side of, are provided. The tips of the setscrews 28, 28 engage the flange portion 29 of the first grasping portion 8 grasped in the socket 20 to fix the nut tool 3 to the tip of the tightening tool 19.

An unillustrated drop-prevention pin is provided at the grip portion of the handle 21, and the drop-prevention pin is locked to the upper end portion 17 so that the tightening tool 19 can be carried during transportation.
However, it is prevented from falling into the pillar 16.

The universal joint 22 can fix the nut tool 3 with respect to the bolt 2 while keeping the nut tool 3 horizontal from directly above, even if the tightening tool 19 is slightly tilted. A diaphragm 25 is arranged around the universal joint 22 so that the diaphragm 25 can be smoothly inserted into the insertion hole 24.

In the first embodiment, as described above, the nut tool 3 is fixed to the tightening tool 19 and the socket 20 at the tip of the tightening tool 19 in the pillar 16 at the time of factory shipment, and the nut tool 3 is built in and installed. Brought to the scene. However, it goes without saying that the tightening tool 19 and the nut tool 3 may be arranged in the pillar 16 at the construction site.

During transportation, even if the tightening tool 19 moves upward in FIG. 2 and is about to come out of the column 16, the pull-out preventing piece 15 is locked to the peripheral edge of the insertion hole 24.
Will not fall off.

At the construction site, after the lower pillar 16 is installed, the lower end of the bolt 2 is screwed into the upper end 17 to be arranged.

The bolt 2 has a pin 27 whose end 27 is not threaded. Therefore, when the nut tool 3 is lowered from above, even if there is some displacement, the tip portion 27 guides the nut tool 3 to an appropriate position,
Can be modified.

Next, the horizontal joining plate 26 is attached to the upper end portion 1.
Place on top of 7. This horizontal joining plate 26 is a pillar 1
6 and this pillar 16 are arranged between adjacent pillars 16 and,
It is used for joining between the pillar 16 and other members adjacent to the pillar 16. Then, on the upper side of the horizontal joining plate 26, the upper pillar 16 containing the tightening tool 19 is placed so as to fit the upper end portion 17.

At this time, if a plurality of guide pins (not shown) are made to project toward the upper end portion 17 side, by matching with the holes for the guide pins provided in the lower end portion 18 of the upper column 16, the upper pin 17 is formed. The pillar 16 can be easily positioned.
Further, by setting the protruding amount of the tip of the guide pin to be larger than the protruding amount of the tip 27 of the bolt 2, the upper pillar 16 is positioned when the tip of the guide pin is inserted into the hole for the guide pin. Is ensured, and the screw groove of the bolt 2 formed below the tip 27 does not come into contact with any part of the lower end portion 18 to damage it.

After the upper pillar 16 is placed, the drop prevention pin is pulled out, and the tightening tool 19 is released from the locking of the upper end portion 17 of the upper pillar 16. Then, the tightening tool 19 is gradually lowered, and the nut tool 3 is inserted from the tip 27 of the bolt 2. Next, the tightening tool 19 is rotated to screw the nut tool 3 into the bolt 2.

Even if the tightening tool 19 is to be pulled out from the pillar 16 before joining, the pull-out preventing pieces 15 and 15 are locked to the peripheral edge of the insertion hole 24 and cannot be pulled out.

At the time of joining, since the first gripping portion 8 of the nut body 4 is gripped by the socket 20 of the tightening tool 19 and screwed into the bolt 2, the lower side interposed between the bolt 2 and the nut tool 3 is held. The upper end portion 17 of the pillar 16, the horizontal joint plate 26, and the lower end portion 18 of the upper pillar 16 are joined by the same tightening force as that which is tightened with the conventional bolts and nuts. Therefore, the mounting strength of all the building units can be improved.

After the joining, when the tightening tool 19 is further rotated to increase the tightening force, the connecting portion 12 loses the tightening force and is twisted, so that the first grip portion 8 and the second grip portion 10 are connected. To release. Therefore, as shown in FIG.
Since the tubular portion 7 is not screwed with the bolt 2, the tightening tool 19 is pulled out from the bolt 2 and only the second grip portion 10 remains screwed to the bolt 2. The nut tool 3 is divided into a first grip portion 8 and a second grip portion 10,
Since the shape is changed, it is possible to visually confirm that the tightening is completed by looking into the pillar 16 from above.

Moreover, since the washer collar 6 having the pull-out preventing piece 15 remains together with the second grip portion 10 after the tightening is completed, the tightening tool 19 that could not be pulled out from the pillar 16 before the joining is joined to the post-joining. Can be pulled out. Therefore, it is possible to more easily confirm that the tightening is completed by the presence or absence of the tightening tool 19 inside the pillar 16.

The tightening tool 19 taken out from the pillar 16 is
By loosening the screw of the set screw 28, the first grip portion 8
It is possible to release the lock of and to remove the first grip portion 8 remaining in the socket 20. Then, it can be reused by attaching the nut tool 3 again.

When the screwing of the nut tool 3 to the bolt 2 is released, the second grip 10 is gripped by the socket 20 of the tightening tool 19 and rotated in the reverse direction. Therefore, in this embodiment, the unit building is disassembled from the bolt 2 to the second grip 1 as well.
It can be easily performed by removing 0 with the tightening tool 19, and it is not necessary to separately prepare a tool for disassembly. Also in this respect, work efficiency is good.

The connecting portion 12 of this embodiment is constructed by providing the groove 13 around the nut body 4,
Not limited to this, it is possible to use a member having a different material such as Teflon, to form a V-shaped groove or a U-shaped groove, or to form a plurality of grooves side by side to form a groove having a certain value or more. Any material may be used as long as it is twisted when a tightening force is applied and the connection between the first grip portion 8 and the second grip portion 10 is released.

Furthermore, in this embodiment, the pillars 16, 16 arranged at the four corners of the building unit are connected to each other between the upper and lower end portions 17, 18 of the building unit. As a matter of course, it may be used for connection between ends of any tubular member such as a steel material.

The set screws 28, 28 of this embodiment are
Is configured to fix the nut tool 3 to the socket 20 by locking the tip end to the flange portions 29, 29, but the invention is not particularly limited to this and, for example, the set screws 28, 28.
Any method may be used as long as the first grip portion is fixed to the socket 20, for example, the tip of the above is brought into contact with the side surface of the nut tool 3 to fix the nut tool 3 to the socket 20.

In the nut tool 3 of this embodiment, the second grip portion 10 and the washer collar 6 are composed of different members, but the present invention is not limited to this, and the pull-out prevention piece is attached to the second grip portion 10. As long as the pull-out prevention piece is provided in the second grip portion 10 such as integrally forming 15, 15, the pull-out prevention piece may have any shape and number.

[0049]

In the fastener of the present invention, since the nut is screwed onto the bolt with the tightening tool, the joining can be performed with the same tightening force as that used with the conventional bolt and nut. Therefore, the tightening strength can be secured and the overall structural strength can be improved.

Moreover, since the first gripping portion and the second gripping portion are separated after joining, the second pulling prevention piece is provided.
The grip part separates from the tightening tool. Therefore, since the tightening tool can be pulled out from the tubular member, it is possible to confirm whether the joining is completed or not joined by the presence or absence of the fastening tool. Therefore, it is not necessary to insert the tool into the tubular member one by one to check the tightened state as in the prior art, and the working efficiency is good.

Further, since the tightening tool can be reused and can also be used as a disassembling tool, work efficiency is also good in this respect.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a tightening tool according to a first embodiment of the present invention, showing a nut tool using a nut body before tightening.

FIG. 2 is a cross-sectional view of the inside of the column showing the fastener according to the first embodiment of the present invention, which illustrates a state in which the nut body is screwed into the bolt with the attachment tool.

FIG. 3 is a cross-sectional view of the inside of the column showing the fastener according to the first embodiment of the present invention, illustrating a state in which the connection between the first grip portion and the second grip portion is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastener 2 Bolt 4 Nut main body (nut) 7 Cylindrical part 8 1st grip part 9 Female screw part 10 2nd grip part 11 Shaft center 12 Connection part 15 Pull-out prevention piece 16 Column (tubular member) 19 Tightening tool 20 Socket 28 Set screw

Claims (3)

[Claims] 1. A fastener having a bolt and a nut, wherein the nut has a first grip portion having an inner periphery having a tubular portion having a diameter larger than an outer diameter of the bolt, and the inner periphery having the first grip portion. The second gripping portion has a female threaded portion that is screwed into the bolt, and the connecting portion that connects the first gripping portion and the second gripping portion with the axes of the first gripping portion and the second gripping portion overlapped with each other. A fastener characterized in that the connection is released when a tightening force of a certain value or more is applied. 2. A tightening tool having a socket having a depth for gripping either one of the first grip portion and the second grip portion. 3. A fastener and a tightening tool for connecting ends of a tubular member, wherein the first grip is fixed to the socket by a setscrew in the tubular member. The fastener and the tightening tool are characterized in that a pull-out preventing piece that is locked inside the tubular member is provided in the second grip portion.