JPH09217724A - Nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut capable of carrying out attachment and deattachment of a bolt simple and in a short time without requiring labor. SOLUTION: A nut consists of a main body 1 on which a non circular cross sectional housing hole 1a is penetratingly formed, a plurality of female screw bodies 2, 2 which are housed in the housing hole 1a and which is formed a female screw 2a screwed around an install object bolt on an inside surface, and a spring 3 for pulling each female screw bodies 2 to a center part side. The female screw body 2 is integrated with the main body 1 by moving each female screw body 2 toward a side having a narrow clearance formed between the wall surface of the housing hole 1a and the bolt, and the female screw body 2 becomes a screwing relation which is tightly with the bolt. Each female screw body 2 is moved to the direction reverse to the moving direction, and thereby, the main body 1, the female screw body 2, and the bolt become loosely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut for screwing a bolt to tighten two parts.

[0002]

2. Description of the Related Art A nut having a hexagonal or quadrangular outer 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. This is the same when removing the nut once tightened.

An object of the present invention is to provide a nut which can be easily attached and detached to and from a bolt in a short time.

[0005]

A nut of the present invention includes a main body 1 having a housing hole 1a having a non-circular cross section formed therein, a housing body 1a housed in the housing hole 1a, and a bolt 6 to be mounted on an inner surface thereof. A plurality of female screw bodies 2, which are formed with female screws 2a to be screwed together,
2 and a spring 3 for pulling each female screw body 2 toward the center side, and by moving each female screw body 2 toward the narrower gap between the wall surface of the accommodation hole 1a and the bolt 6, the female screw body 2 is moved. The main body 1, the female screw body 2, and the bolt 6 are loosened by the movement of each female screw body 2 in the direction opposite to the moving direction while being integrated with the main body 1 and in a tight screwing relationship with the bolt 6. is there.

Each of the female screw bodies 2 has a cross-section in which the receiving hole 1a is divided into two circles and is slightly displaced from each other in a close contact state.
Is a curved plate body whose thickness gradually decreases from one end to the other end, and the outer surface thereof may be approximately equal to the curvature of the semicircle of the accommodation hole 1a.

Further, it is also possible that the accommodating hole has an elliptical cross section, the spring is a leaf spring accommodated along the accommodating hole, and the female screw bodies are accommodated inside thereof.

The nut-shaped outer shape may be formed on the main body 1 or its lid 5.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a nut of the present invention will be described with reference to FIGS.

As shown in FIG. 1, this nut has a front cover having a main body 1 having a special cross-section containing hole 1a, two female screw bodies 2, 2, a spring 3 and a circular through hole 4a. 4 and circular through-holes 5a are formed in the rear lid 5.

In the nut of the present invention, each female screw body 2 is accommodated in the accommodation hole 1a of the main body 1, and the spring 3 engages with each female screw body 2. Then, it is assembled by closing the front and back with the front lid 4 and the rear lid 5.

The main body 1 is formed by penetrating an accommodating hole 1a having a special cross section in a cylindrical body. The cross-sectional shape is obtained by dividing a circle into two parts and slightly shifting them in a close contact state.

Each of the female screw bodies 2 is a curved plate body whose thickness gradually decreases from one end to the other end. The curved outer surface is substantially equal to the curvature of the semicircle of the accommodation hole 1a. In addition, the curved inner surface is made substantially equal to the outer diameter of the bolt 6 to be attached, and there is the female screw 2 that is screwed into the bolt 6 to be attached.
a is formed. Therefore, the female screw bodies 2 can function as one nut in pairs.

The spring 3 is formed by bending a wire made of spring steel and bending the hooking portion 3a at each end, and each hooking portion 3a is formed on the end face of each female screw body 2. It is inserted in the hooking hole 2b. The spring 3 in the attached state acts so as to bring the pair of female screw bodies 2 closer to each other. Therefore, when the nut of the present invention is attached to the bolt 6, each female screw body 2 is loosely pressed against the bolt 6.

The front lid 4 closes the mounting side to the bolt 6, and the inner diameter of the through hole 4a is slightly larger than the outer diameter of the bolt 6. Then, it is integrated with the main body 1 by welding or the like.

The rear lid 5 is also integrated with the body 1 on the opposite side by welding or the like. The inner diameter of the through hole 5a is also slightly larger than the outer diameter of the bolt 6. Further, the outer shape of the rear lid 5 is hexagonal or quadrangular like the conventional nut. In addition,
The nut-shaped outer shape can also be formed on the main body 1.

The nut having such a structure is shown in FIG.
It is used in the formwork tightening work in the formwork work for constructing the walls of buildings shown in.

In the formwork construction, first, the formwork veneer plates 7 are arranged to face each other with the separator 8 ensuring an interval corresponding to the thickness of the wall of the building. Then, a bolt (home tie) 6 is attached to the bolt portion of the P-con 9 which penetrates through the formwork veneer plate 7 by screw engagement. Next, in order to prevent the formwork veneer plate 7 from waving, usually, one vertical pipe and two horizontal pipes 10 are arranged along the surface of the formwork veneer plate 7. Then, in order to fix each single pipe 10, the three-piece metal fitting 11 is attached to the bolt 6. The nut of the present invention is attached to the bolt 6 in such a state.

Each female screw body 2 before being pushed in is attracted by the spring 3 so that the whole is separated from the wall surface of the accommodation hole 1a. Then, by pushing in the nut, each female screw body 2
Is pushed outward by the force of the bolt 6 against the force of the spring 3 and is in the state shown in FIG. 2 (1), but there is still a small gap between it and the wall surface of the accommodation hole 1a. It can be easily moved to near the tightening position without rotating the nut. Note that FIG. 2 is a view as seen from the pushing side.

When the nut is rotated clockwise (in the direction of the arrow in FIG. 2 (2)) after being moved close to the tightening position, each female screw body 2 is moved in the accommodation hole 1a by friction with the bolt 6. Move in the opposite direction. That is, each female screw body 2 moves toward the narrower gap between the wall surface of the accommodation hole 1a and the bolt 6. As a result, each female screw body 2 is tightly integrated with the main body 1 and has a close screwing relationship with the bolt 6 similar to a normal bolt-nut relationship. Therefore, it is possible to tighten as firmly as a normal nut.

In order to remove the tightened nut, first, like the normal nut, it is rotated counterclockwise. Due to the rotation, each female screw body 2 moves in the direction opposite to the rotation direction on the same principle as when tightening. Therefore, as shown in FIG. 2 (1), a gap is created between the wall of the accommodation hole 1a and the nut, and thereafter, the nut can be moved and removed without rotating.

In addition to what has been described above, the accommodating hole 1a of the main body 1 has an elliptical cross section, and the spring 3 is an elliptical curved leaf spring accommodated along the accommodating hole 1a. The body 2 may be housed. In short, by the rotation of the main body 1, each female screw body 2 is moved by the frictional force between the mounting target bolt 6 and the wall surface of the accommodation hole 1a and the mounting target bolt 6 to a narrower or wider gap. Various deformations are allowed as long as the main body 1 and the female screw body 2 are integrated, and the bolt 6 to be attached has a tight screwing relationship, and, conversely, is loose.

[0023]

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

That is, no matter how long the bolt is, it is possible to easily attach and detach the nut in a short time without labor. Moreover, the engagement strength with the bolt is comparable to that of the conventional nut.

[Brief description of drawings]

FIG. 1 is a perspective view showing each component of the nut of the present invention.

FIG. 2 is a plan view of the nut of the present invention when the front cover is removed, (1) is when the nut is slid on the bolt, and (2) is a clockwise rotation at the bolt tightening position. It is when you are.

FIG. 3 is a view showing a usage mode of the nut of the present invention in the formwork construction.

[Explanation of symbols]

 1 Main Body 1a Storage Hole 2 Female Threaded Body 3 Spring 4 Front Lid 5 Rear Lid 6 Mounting Target Bolt

Claims (1)

[Claims] 1. A body having a non-circular cross-section accommodating hole formed therethrough,
It is housed in the housing hole, and is formed on the inner surface with a plurality of female screw bodies in which female threads to be screwed with the bolt to be attached are formed, and a spring for pulling each female screw body toward the center side, and the wall surface of the housing hole. By moving each female screw body toward the narrower gap between the bolt and the bolt, the female screw body is integrated with the main body and has a close screwing relationship with the bolt, and the female screw body moves in the direction opposite to the moving direction. A nut that loosens the main body, the female screw body, and the bolt when moved.