JPH0526218A - Thrust fastening tapless bolt - Google Patents

Abstract

PURPOSE:To fasten the material to be fastened and a fastening main frame strongly with tapless bolt even in building, iron beam structure, and thin plate work or the like in the case that a tap can not be stood because plate thickness is thin against a diameter, or in the case that the tap can not be stood effectively, or in the case that the tap processing can not be performed because of other reason. CONSTITUTION:In the case that the material 16 to be fastened and a fastening main frame 17 are fastened, a lock bolt 12 pulls a taper collet 15 to enlarge an insertion part 3 of a tapless bolt main frame 7. The taper part 6 abuts on a corner part 19 of the fastening main frame 17 to lock in the radial direction and the thrust direction simultaneously, and the material 16 to be fastened and the fastening main frame 17 are fastened mainly in the thrust direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applicable to, for example, construction, steel structure beams, and thin plate workpieces when the tap does not stand up due to a thin plate thickness or the like, or when it does not stand effectively, or other The present invention relates to a thrust tightening tapless bolt used when tapping cannot be performed for the reason.

Conventionally, in construction, steel structure beams, and thin plate workpieces, when tapping does not stand up due to a thin plate thickness or the like, or when it does not stand effectively, or when tapping cannot be done for other reasons. Do not insert a bolt from the inner side of the tightening body to expose the threaded part of the Holt on the front surface of the material to be tightened, screw a nut onto it, and do not tap the tightening body. There is known a tapless bolt that locks a bolt having no threaded portion by inserting a bolt after the bolt is inserted (for example, Japanese Patent Application No. 2-104636 devised by the present inventor).
No.).

[0003]

In the former of those described in the prior art, if the bolt cannot be inserted from the inner side of the inside of the tightening body, it cannot be used at all. I had a problem. Further, in the latter case, since the tightening body is thin, the bolt cannot be completely locked only by tightening the small diameter hole in the radial direction, and there is a problem in that the bolt easily comes off in the thrust direction. It was

The present invention has been made in view of the above problems of the prior art. The object of the present invention is effective when the tap does not stand up due to a thin plate thickness or the like with respect to the diameter. Even if the structure does not stand up or if tapping is not possible due to other reasons, the material to be tightened and the tightening body can be firmly tightened without tapping even in construction, steel structure beams, thin plate workpieces, etc. The present invention is intended to provide a thrust tightening tapless bolt.

[0005]

In order to achieve the above object, the present invention provides a head, a swivel portion provided outside the front portion of the head, an insertion portion continuous with the head, and the head. And a left screw hole provided inside the insertion portion, a taper hole having a large diameter toward the tip side continuous with the left screw hole, and a taper portion having a large diameter toward the tip side provided outside the insertion portion. The formed tapless bolt main body, the split groove provided in the center direction from the root to the tip of the insertion portion of the tapless bolt main body, the left-hand threaded portion screwed into the left-handed threaded hole, and the left-handed thread Lock bolt formed from a small-diameter right-hand threaded portion continuous to the section and a swivel section provided inside the front section, a taper section that matches the taper hole of the tapless bolt body, and a right-handed thread section of the lock bolt. With a right-hand threaded hole Consists of a par collet provides thrust fastening tap-less bolt, characterized in that to be able to tighten firmly by Tappuresu the clamping body and the material clamp object.

[0006] The number of the split grooves may be 2 to 4.

[0007]

Operation When first used, the lock bolt 12
And the taper collet 15 is a tapless bolt body 7
Is set at a position where the insertion part 3 is not expanded, and the insertion part 3 is inserted into the insertion hole 18 of the tightening body 17 via the material 16 to be tightened.
Inserted in. In this case, since the outer diameter of the tip portion of the insertion portion 3 of the tapless bolt body 7 is slightly smaller than the inner diameter of the insertion hole 18 of the tightening body 17, the insertion can be performed by manual pushing.

When the insertion is completed, the turning portion 2 provided outside the front portion of the head 1 of the tapless bolt body 7 is pressed to rotate the lock bolt 12 with a hexagon wrench or the like matching the turning portion 11. For example, the left screw part 9 and the right screw part 10
The taper collet 15 is pulled in by the and to enlarge the taper hole 5 of the tapless bolt body 7.

In this case, the insertion portion 3 of the tapless bolt main body 7 is enlarged because it has the split groove 8. When the insertion portion 3 is enlarged, the taper portion 6 is brought into contact with the corner portion 19 of the tightening body 17,
Since the thrust direction is in contact with the radial direction at the same time, the thrust is completely locked, and the tightened material 16 and the tightening body 17 are tightened in the thrust direction.

When the insertion portion 3 is enlarged, the tightened material 16
And, regardless of whether the work length of the tightening body 17 is a little long or short, the tightening body 17 is locked at an arbitrary contact portion of the taper portion 6. When the taper portion 13 of the taper collet 15 is in close contact with the taper hole 5 of the insertion portion 3, the taper collet 15 does not rotate and the left screw portion 9 and the right screw portion 10 of the lock bolt 12 are not rotated.
With, only the thrust direction is activated.

When the thrust tightening tapless bolt is loosened and disassembled, the lock bolt 12 may be rotated in the opposite direction to the above, whereby the taper collet 15 should be separated in the direction opposite to the retracting direction. become.

After that, the insertion part 3 of the tapless bolt main body 7 may be pulled out from the insertion hole 18 of the tightening main suspension 17 and the material 16 to be tightened. If the insertion part 3 is not easily reduced, that is, When the taper portion 6 hits the corner portion 19 of the tightening body 17 and cannot be easily removed, a tool may be inserted into the notch groove 20 provided at the rear end portion of the head 1 of the tapless bolt body 7 and kneaded. Alternatively, a threaded portion 21 provided on the outer periphery of the head 1 of the tapless bolt body 7
When a hexagon nut or the like is screwed into and is tightened, the tapless bolt body 7 is pulled out.

[0013]

EXAMPLES Examples will be described with reference to the drawings. 1 and 2, one embodiment of the thrust tightening tapless bolt of the present invention comprises a tapless bolt body 7, a lock bolt 12, and a taper collet 15.

The tapless bolt body 7 includes a head 1
A swivel part 2 provided outside the front part of the head part 1, an insertion part 3 continuous with the head part 1, the head part 1 and the insertion part 3
A left screw hole 4 provided inside, a taper hole 5 having a large diameter toward the tip side continuous with the left screw hole 4, and a taper having a large diameter toward the tip side provided outside the insertion portion 3. And part 6.

In the insertion portion of the tapless bolt main body 7, one split groove 8 provided in the center line direction is provided.

The lock bolt 12 has a left-hand threaded portion 9 which is screwed into the left-handed threaded hole 4 of the tapless bolt body 7, a small-diameter right-handed threaded portion 10 which is continuous with the left-handed threaded portion 9, and a front inner portion It is formed by the swivel part 11 provided.

The taper collet 15 is formed of a taper portion 13 that matches the taper hole 5 of the tapless bolt body 7 and a right-hand screw hole 14 that is screwed into the right-hand screw portion 10 of the lock bolt 12. .

16 and a material to be tightened by a thrust tightening tapless bolt, 17 is a tightening body having an insertion hole 18 into which the insertion portion 3 of the tapless bolt body 7 is inserted, and 19 is the tightening. It is a corner portion of the insertion hole 18 of the main body 17.

The present invention is not limited to the above-mentioned embodiment, and for example, the shape of the head and the insertion portion of the tapless bolt body, the width and shape and number of the split grooves, the shape of the lock bolt,
The shape of the tapered collet, in particular, the angle of the tapered portion is arbitrary, and the material of the thrust tightening tapless bolt may be aluminum alloy or copper.

Further, a notch groove 20 is provided at the rear end portion of the head portion 1 of the tapless bolt body 7 and a tool is inserted into the notch groove 20 and kneaded so that the tapless bolt body 7 can be easily pulled out when disassembled. be able to.

Further, a screw portion 21 is provided on the outer periphery of the head 1 of the tapless bolt main body 7 and a hexagon nut or the like is screwed into the screw portion 21 and tightened so that the tapless bolt main body 7 can be easily pulled out when disassembled. can do. 22
Is the turning part of the hexagonal hole, but it is not always necessary.

Further, when the tapered portion 23 is provided at the tip of the insertion portion 3 of the tapless bolt main body 7, it is easy to insert the tightening main body 17 into the insertion hole 18 when it is reused. You can

Although the embodiment shown in the drawings shows the case where the tightening body is thin and the insertion hole thereof penetrates, the thrust tightening tapless bolt of the present invention has the inserting portion of the tapless bolt body. By loosening the taper part, it is effective as a tapless bolt even in the embedding hole.

When used as the embedded tapless, the tip of the taper collet contacts the bottom of the embedded hole when the lock bolt is reversed, so that the tapless bolt body can be pulled out.

[0025]

Since the present invention is configured as described above, it has the following effects. That is, first,
Even in construction, steel structure beams, thin plate workpieces, etc. where the tap does not stand up due to the thin thickness of the diameter, or it does not stand up effectively, or when tapping cannot be done for other reasons. The tightening material and the tightening body can be firmly tightened without tapping.

Secondly, it is effective as a tapless bolt not only when the insertion hole of the tightening body is penetrated, but also when the insertion hole or the embedded hole which is not penetrated is used. Since the tip of the tapered collet hits the bottom of the embedding hole by reversing the lock bolt, the tapless bolt body can be easily pulled out.

Thirdly, when the material to be tightened and the tightening body are tightened, the taper part of the insertion part of the tapless bolt body engages with the corner part of the insertion hole of the tightening body to secure it. Since the thrust force is applied in the thrust direction, the thrust force can be increased.

Fourth, since a taper portion is provided on the outer periphery of the insertion portion of the tapless bolt body, if the work length of the tightening body is within a certain range, the tightening body can be arbitrarily tightened within the range of expansion of the insertion portion. It is possible. That is, thickness work adjustment can be performed.

Fifthly, the thrust tightening tapless bolt can be easily loosened or disassembled by performing the operation opposite to the tightening. In particular, it is possible to provide a notch groove in the tapless bolt main body so that a tool can be inserted into it and knead it, or to provide a screw part on its head and screw it with a hexagon nut etc. to tighten it. In this case, the tapless bolt body can be pulled out and disassembled more easily.

Sixth, the lock bolt is provided with a left-hand thread portion and a right-hand thread portion in succession, whereby the taper hole and the taper of the taper collet provided inside the insertion portion of the tapless bolt body are tapered. Since the contact portion with the portion does not rotate, it is possible to prevent both from being easily scratched.

Seventhly, since there is no instability factor in the manufacture of each part, it is possible to secure the tightening operation and obtain stable strength, it is economical, and the whole can be designed compact. .

Eighth, it is also effective for small-diameter screws, and even in this case, since the outer diameter of the lock bolt can be made large, the strength can be stabilized.

Ninth, when two to four split grooves are provided, it is possible to more easily enlarge the taper hole of the tapless bolt body.

[Brief description of drawings]

FIG. 1 is a longitudinal cross-sectional view of a main part in an inserted state (a state before tightening) showing an embodiment of a thrust tightening tapless bolt of the present invention.

2 is a left side view of the thrust tightening tapless bolt shown in FIG. 1. FIG.

[Explanation of symbols]

1 head 2 revolving part 3 Insert 4 Left screw hole 5 Taper hole 6 taper part 7 Tapless bolt body 8 split grooves 9 Left-hand thread 10 Right-hand thread 11 Revolving part 12 Rock bolt 13 Tapered part 14 Right screw hole 15 taper collet 16 Materials to be tightened 17 Tightening body 18 insertion holes 19 Corner 20 Notch groove 21 Thread 22 Revolving part 23 point detail

Claims (2)

[Claims] 1. A head part, a swivel part provided outside the front part of the head part, an insertion part continuous to the head part, a left screw hole provided inside the head part and the insertion part, and the left screw. A tapless bolt main body formed from a tapered hole that is large in diameter toward the tip side that is continuous with the hole and a tapered portion that is large in diameter toward the tip side that is provided outside the insertion portion, and the tapless bolt body described above. A split groove provided in the center direction from the root portion to the tip portion of the insertion portion, a left-hand thread portion screwed into the left-hand screw hole, a small-diameter right-hand thread portion continuous with the left-hand thread portion, and provided inside the front portion. And a tapered collet having a taper portion corresponding to the taper hole of the tapless bolt body and a right-hand screw hole screwed with the right-hand screw part of the lock bolt. Tighten the tightening material and the tightening body. A thrust tightening tapless bolt characterized in that it can be firmly tightened by pressing. 2. The thrust tightening tapless bolt according to claim 1, wherein the number of the split grooves is 2 to 4.