JPH0719225A - Nut - Google Patents

Abstract

PURPOSE:To easily fasten a nut to a bolt by composing it of a nut-form outer shell body whose inner diameter is contracted, plural pieces of split nuts, having a tapered outer surface, and formed with an external thread each inside, and a spring body surrounding these element and making come close to each other. CONSTITUTION:When a bolt 9 is inserted thereinto from the side of a small diametral opening in a state that two split-nuts 2 surrounded by a plate 3 are housed in an internal space of an outer shell body 1, each nut 2 is pushed by this bolt 9, and it is opened against spring force of this plate spring 3 itself, so that this bolt 9 is accepted in space between these split nuts 2 and 2, whereby these split nuts 2 are stuck tightly to the bolt 9 through the spring force. When the outer shell body 1 is rotated clockwise, the split nuts 2 are also rotated clockwise, advancing to each side of two members 7 and 8 and they receive reaction from the tapered part 11 of the outer shell body 1, embracing the bolt 9 stronger. Therefore a job for bolt clamping can be done simply with a modicum of labor in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is designed to be screwed onto a bolt to
It relates to a nut that tightens two parts.

[0002]

2. Description of the Related Art A nut having a hexagonal shape or a square shape and a female screw formed in a central hole has been widely known.

[0003]

When the nut is used, it is fitted on the tip of the bolt and rotated to advance to the tightening position and then tightened strongly.
The forward work to the tightening position by the rotation takes time and effort, and particularly when the bolt is a long work of 2 to 3 m or when the nut tightening work is large, the weight occupying the whole work of the nut forward work. Will be remarkably large.

An object of the present invention is to provide a nut which can be easily attached to a bolt and tightened without labor and time.

[0005]

In order to achieve the above object, the nut of the present invention comprises a nut-shaped outer shell having a tapered inner wall portion whose inner diameter is gradually reduced toward one opening. A plurality of split nuts that are housed inside and that have a tapered outer surface along the tapered inner wall portion of the outer shell and that have internal threads formed inside, and energize them so that they are surrounded and approach each other. It consists of a spring body. Also, instead of using a split nut and spring body,
It is also possible to use an integrated split nut made of a leaf spring that has both functions. Furthermore, it is also possible to expose a part of the disengagement body that can be inserted between the split nuts or the split nut portions of the leaf spring integrated split nut to widen the space between them, to the outside of the outer shell body.

[0006]

[Operation] In the nut configured as above,
When inserting the outer shell into the bolt from the small diameter opening side,
Each split nut or split nut portion is pushed by the bolt to open against the spring force of the spring body or the plate spring integrated split nut itself, and the bolt is received in each split nut or split nut portion. Then, each split nut or each split nut portion is brought into close contact with the bolt by the spring force. After that, when the outer shell is rotated, each split nut or each split nut portion also rotates and advances toward the tightening target member side, and each split nut or each split nut portion reacts from the tapered inner wall portion of the outer shell body. Receive the bolt more strongly and hold it. Also, when disengaging bodies are provided, when the disengaging bodies are pushed from the outside of the outer shell after being inserted into the bolts once, the disengaging bodies break into the split nuts or between the split nuts and The gap between the split nuts or split nut parts and bolts,
Retreat is possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the nut of the present invention will be described with reference to FIGS.

This nut is composed of an outer shell body 1, a leaf spring 3 which is rolled into a cylindrical shape and is housed inside the outer shell body 1, a split nut 2 surrounded by the inner side of the leaf spring 3, and an outer shell body 1. It is composed of a lid 4 which is put on.

The outer shell 1 has a hexagonal diameter or a quadrangular outer shape similar to that of a conventional nut, and has a space for accommodating the split nut 2 and the leaf spring 3 therein. The cross-sectional shape of the internal space may be a polygon such as a hexagon or a circle. The inner wall thereof has a tapered portion 11 which is gradually reduced toward one opening. In addition, 12 in FIG. 1 is a hole for making the engagement releasing body 6 mentioned later project outside.

The split nut 2 is divided into, for example, two pieces, and the split nuts 2 function as one nut as a set. The outer surface thereof has a cross-sectional shape along the inner wall surface of the inner space of the outer shell 1 and is a tapered portion 21. A female screw 22 is formed on the inner wall of the split nut 2.

The leaf spring 3 is formed by rolling a very thin plate-like spring made of one piece of spring steel into a cylindrical shape, and its inner diameter is
The split nuts 2 which are in a state of being abutted and surrounded by each other can be tightened with an extremely weak force. Therefore, when the bolts 9 are inserted from the side of the tapered portion 11 of the split nut 2 in the leaf spring 3, the interval between the pair of split nuts 2 increases, and the inner diameter of the leaf spring 3 increases. The set of split nuts 2 receives a spring force from the leaf spring 3 and is pressed against the bolt 9. Therefore, the bolt 9 does not come off completely even if the hand is released. Further, at the portions corresponding to both tube ends of the leaf spring 3, there are formed several cut-and-raised portions 3a toward the outside. If the cut-and-raised portion 3a is not provided, the outer diameter of the leaf spring 3 that surrounds the set of split nuts 2 in a butted state is smaller than the inner diameter of the inner space of the outer shell 1, so that the set of split nuts 2 is formed. Will tilt in the inner space of the outer shell 1 and hinder the insertion of the bolt 9. That is, the cut-and-raised portion 3a functions to center the split nut 2.

Instead of using the leaf spring 3 as described above, a coil spring may be employed. Its inner diameter is leaf spring 3
The same as in the above case, the function is the same as that of the leaf spring 3.
Moreover, in the case of the coil spring, the one corresponding to the cut-and-raised portion 3a is unnecessary. This is because, although the reason is not clear, the centering of the split nut 2 does not pose a problem.

Instead of using the split nut 2 surrounded by the leaf spring 3 or the coil spring as described above, the leaf spring integrated split nut 5 shown in FIG.
Can also be adopted.

The leaf spring-integrated split nut 5 has a ring portion 51 and split nut portions 52 on both sides thereof which are integrally developed through a connecting portion 53 on a single plate made of spring steel and having a predetermined thickness. Punching, and then, each split nut portion 52 is raised from the ring portion 51 and bent so that the tip ends approach each other.
In addition, 54 is a taper-shaped part along the taper-shaped inner wall part 11 of the outer shell 1, 55 is a female screw, and 56 is a receiving part for receiving the engagement releasing body 6 described later.

When the bolt 9 is inserted from the tip end side of the split nut portion 52 of the integral split nut 5 made of the leaf spring, the spacing between the split nut portions 52 is expanded. Then, each split nut portion 52 is pressed against the bolt 9 by its own spring force. Therefore, the bolt 9 does not come off completely even if the hand is released.

Finally, an embodiment in which the disengagement body 6 is pushed between the split nuts 2 or between the split nut portions 52 of the leaf spring integrated split nut 5 to expand the spacing therebetween. Will be described.

FIG. 3 shows a cross section of the nut at the position of the disengagement body 6 in which the disengagement body 6 is inserted between the split nuts 2 to expand the distance therebetween. There is. According to this, in the nut, the disengagement body 6 does not project near the center of the outer shell body 1 in the longitudinal direction, and the hole 12 having a size such that the engagement body 6 is partially exposed is formed.
Further, at the corresponding edge positions of the leaf spring 3, a bay insertion portion similar to the bay insertion portion 56 of the leaf spring integrated type split nut 5 shown in FIG. 4 is formed, and the hole 12 of the outer shell body 1, the split nut 2, and the leaf spring. A disengagement body 6 having an appropriate shape such as a spherical shape is interposed between the engaging portion 3 and the groove insertion portion 3. A nut using the leaf spring integrated type split nut 5 is almost the same as this, but in this case, as shown in FIG. 4, two bay insertion portions 56 are provided and the outer shell body 1 is correspondingly provided. 2 holes 12 are also opened in the outer shell 1
It is also possible to interpose two disengagement bodies 6 between the hole 12 and the recessed portion 56 of the leaf spring integrated type split nut 5.

The nut having the above-mentioned structure is arranged such that the split nut 2 surrounded by the leaf spring 3 or the leaf spring integrated type split nut 5 is accommodated in the inner space of the outer shell 1 from the small diameter opening side. When inserted into the bolt 9, each split nut 2 or each split nut portion 52 is pushed by the bolt 9 and opens against the spring force of the leaf spring 3 or the leaf spring integrated split nut 5 itself.
The bolt 9 is received between the split nuts 2 or the split nut portions 52, and the split nuts 2 or the split nut portions 52 come into close contact with the bolts 9 by the spring force. After that, it may be rotated clockwise like a normal nut. That is,
When the outer shell 1 is rotated clockwise, each split nut 2 or each split nut portion 52 also rotates clockwise and advances toward the members 7 and 8 side, and each split nut 2 or each split nut portion 52 is The bolt 9 is more strongly held by receiving a reaction force from the tapered portion 11 of the outer shell 1. Therefore, the tightening force of the nut of the present invention is superior to that of the conventional bolt and nut, and is never inferior.

When the disengagement body 6 is provided, when the engagement disengagement body 6 is pushed with a finger from the outside of the outer shell body 1 after being once inserted into the bolt, the disengagement body 6 is divided into each split nut. Two or each split nut portion 52 is interrupted to widen the gap between them, so that a gap is created between each split nut 2 or each split nut portion 52 and the bolt 9. Therefore, the nut can be retracted in that state.

[0020]

Since the present invention is configured as described above, it has the following effects.

That is, no matter how long the bolt is, it can be instantly moved close to the target position, and the bolt tightening work can be easily performed in a short time with a little labor. Moreover, the engagement strength with the bolt is superior to the conventional nut, and is never inferior. In addition, when the disengagement body is provided, it can be retracted after being inserted into the bolt once, and it is particularly suitable for fixing the bolt at an intermediate position and is convenient for removal at the time of disassembly.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a nut of the present invention.

FIG. 2 is a sectional view when two members are fastened together with a bolt by the nut of the present invention.

FIG. 3 is a cross-sectional view of the nut of the present invention provided with a disengagement body in the disengagement body position.

FIG. 4 is a perspective view of a leaf spring integrated type split nut which is a component of the nut of the present invention.

[Explanation of symbols]

 1 Outer shell 11 Tapered part 2 Split nut 21 Tapered part 22 Female screw 3 Leaf spring 4 Lid 5 Leaf spring integrated split nut 9 Bolt

Claims (3)

[Claims] 1. A nut-shaped outer shell body having a tapered inner wall portion whose inner diameter is gradually reduced toward one opening, and a taper shape accommodated inside the outer shell body along the tapered inner wall portion of the outer shell body. A nut comprising a plurality of split nuts having an outer surface and having internal threads formed on the inner side thereof, and a spring body enclosing them and energizing them so as to approach each other. 2. A nut-shaped outer shell body having a tapered inner wall portion whose inner diameter is gradually reduced toward one opening, and a tapered outer surface along the tapered inner wall portion, and a female screw. A plurality of split nuts formed inside are integrally formed with the central ring portion, and the split nuts are bent so that the tips of the split nuts come close to each other and are housed inside the outer shell body. And a nut consisting of. 3. A part of the disengagement body which can be inserted between the split nuts of the split nuts or the leaf spring integrated split nuts to widen the space between them, is exposed to the outside of the outer shell. The nut according to claim 1 or claim 2.