JP2002106517A - Clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cramp with a low-cost simple structure which can be elastically fixed preventing a joint bolt from loosening due to vibration or the like. SOLUTION: This cramp is provided with a main body 2 letterformed U with opposed both legs 3 and 4. In a clamp 1 screwing and penetrating an engagement volt 6 clamping the flange part 10 of H steel between the other leg part on the other both legs parts 3 and 4 facing this main body 2 letterformed U, the deformation of the main body 2 could be modulus of section of 50-80 percent of the bearing force of the yield point of the main body 2 when the engagement volt 6 is clamped. Moreover tilting the engagement volt 6 toward the inside screws and penetrates the main body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp used for steel frame construction and the like, and more particularly, to a clamp which clamps an object such as a steel frame on a U-shaped main body and fastens with a fastening bolt.

[0002]

2. Description of the Related Art Conventionally, as clamps of this kind, Japanese Patent Publication No. 1-52088, Japanese Utility Model Laid-Open No. 6-25610, and Japanese Utility Model Laid-Open No.
No.-25610, Jitsuhei 6-20837 and Jitsuhei 3
No. -10282 is known, which comprises a U-shaped body having opposing legs, which clamps an object to be clamped between one of the opposing legs of the U-shaped body with the other leg. The fastening bolt is screwed through and fastened.

[0003]

SUMMARY OF THE INVENTION
The No. 52888 clamp is a technology for processing a flat plate into a U-shape with a press. The rigid structure of the clamp makes it difficult to absorb vibrations and the like generated in the steel frame, and the fastening bolts are easily loosened and come off. There is a point. Also, JP-A-6-2
In No. 00910, a conical spring is used at the tip of the fastening bolt to strengthen against vibration, but the structure of the fastening bolt is complicated and the cost increases.

In Japanese Utility Model Laid-Open No. 6-25610, a disc spring is used at the tip of the fastening bolt, and the tip of the small-diameter shaft portion is pressed against the fastening bolt. Although the spring is interposed on the opposite side to enhance the vibration, the structure is similarly complicated and the cost increases.

Further, in Japanese Utility Model Publication No. 3-10282, the clamp is made of a U-shaped forging, but has a high rigidity.
There was a drawback that the fastening bolt was easily loosened by vibration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to eliminate the above-mentioned drawbacks, to have a simple structure, at a low cost, and to fix the fastening bolt in an elastic state without loosening due to vibration or the like. It is intended to provide a simple clamp.

[0007]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to the first aspect of the present invention, there is provided a "U-shaped main body having both opposing legs, and one of the opposing legs of the U-shaped main body is provided with an object to be clamped between the other leg. In the clamp for screw-fastening a fastening bolt to be fastened, when the fastening bolt is tightened, the cross-section coefficient such that the bending of the U-shaped main body is 50% to 80% of the yield strength of the U-shaped main body. A clamp characterized in that: ].

According to the first aspect of the present invention, when the fastening bolt is tightened, the section modulus of the U-shaped main body is 50% to 80% of the yield strength of the U-shaped main body. By doing so, when the fastening bolt is tightened, the amount of elastic deformation is increased, the vibration is effectively absorbed by utilizing the elastic deformation of the U-shaped main body, and the loosening of the fastening bolt can be prevented.

According to a second aspect of the present invention, there is provided a clamp as set forth in the first aspect, wherein the fastening bolt is inclined inwardly with respect to the U-shaped main body and screwed therethrough. ].

According to the second aspect of the present invention, the fastening bolt is tilted inward with respect to the U-shaped main body and screwed and penetrated, so that when the fastening bolt is tightened, the fastening bolt is attached to the clamped object. It is perpendicular to the clamp, so that it can be securely tightened. Even if a large external force acts on the clamp, it is possible to prevent the fastening bolt from being bent or the clamp from coming off.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the clamp according to the present invention will be described below in detail with reference to the drawings.

First, a first embodiment will be described with reference to FIGS. FIG. 1 is a side view of the clamp, and FIG. 2 is a diagram showing an attached state of the clamp.

In the first embodiment, the clamp 1
Has a U-shaped main body 2 and a pair of opposing legs 3, 4
And a connecting portion 5 connecting the legs 3, 4. A fastening bolt 6 for fastening a flange 10 made of, for example, an H-beam, which is an object to be clamped, is threaded through one leg 3 with the other leg 4.

The U-shaped main body 2 is formed by rolling a long U-shaped steel material and cutting it to a required width. When the U-shaped main body 2 is attached to the H-shaped steel flange portion 10 with a predetermined torque by tightening the fastening bolts 6, the U-shaped main body 2 is bent and can be fixed to the H-shaped steel flange portion 10 in an elastic state. The section modulus of the U-shaped main body 2 is set to be 50% to 80% of the elastic limit of the U-shaped main body 2 (yield point strength σt).

As shown in FIG. 3, the U-shaped main body 2 applies a predetermined torque of, for example, 450 kgf · cm to the fastening bolt 6.
Assuming that the axial force acting upon tightening at [4410 N · cm] is P, the moment M acting on the U-shaped main body 2 is M = P × L. Here, L is the distance between the inside position of the U-shaped main body 2 and the central axis of the fastening bolt 6. At this time, the stress σ generated in the U-shaped main body 2 is σ = M / Z (Z: section modulus of the U-shaped main body 2). The section modulus Z is calculated so that the stress σ is 50% to 80% of the yield strength σt of the steel material of the U-shaped main body 2.

By forming the U-shaped main body 1 having a cross-sectional shape having such a cross-sectional coefficient Z, the U-shaped main body 1 when the fastening bolt 6 is tightened with a predetermined torque (for example, 4410 N · cm). The amount of elastic deformation increases, and even if vibration occurs in steel frames, etc., the vibration is absorbed by the magnitude of the elastic deformation,
The structure is such that the fastening bolt 6 is hardly loosened.

The reason for setting the yield strength σt to 50% to 80% is that if the yield strength is set to 50% or less, the amount of deflection is small and vibration is not absorbed much. If the ratio is set to 80% or more, when the fastening bolt 6 is excessively tightened by carelessness of an operator, excessive torque is introduced, the U-shaped main body 2 exceeds the elastic range and reaches the plastic range, and the U-shaped main body 2 is deformed. This is because (an unusable state) may occur. When the width of the U-shaped main body 2 and the allowance of the H-shaped steel to the flange portion 10 are increased, the U-shaped main body 2 can be prevented from rotating sideways when the fastening bolt 6 is tightened.

In a state where the clamp 1 is mounted on the flange portion 10 of the H-shaped steel as an object to be clamped, as shown in FIG.
When the fastening bolt 6 is tightened with a predetermined torque and attached to the flange 10 of the H-shaped steel, the U-shaped main body 2 is greatly elastically deformed, and the fastening bolt 6 is fixed to the flange 10 of the H-shaped steel.
, The vibration is effectively absorbed by utilizing the elastic deformation of the U-shaped main body 2, and the loosening of the fastening bolt 6 can be prevented.

Next, a second embodiment will be described with reference to FIGS. FIG. 4 is a side view of the clamp, and FIG. 5 is a diagram illustrating a mounting state of the clamp.

In the second embodiment, even if the fastening bolt 6 is inclined inward to the U-shaped main body 2 and screwed therethrough, and the fastening bolt 6 is tightened with a predetermined torque, the fastening bolt 6 is Since it is mounted perpendicularly to the flange 10 of the H-shaped steel (perpendicular to the flange surface of the flange of the H-shaped steel), a sufficient tightening force can be obtained, and an external force acting on the clamp 1 in the detaching direction acts. Also, there is no possibility that the fastening bolt 6 will bend or the U-shaped main body 2 will come off.

Next, a third embodiment will be described with reference to FIGS. 6 is a side view of the clamp, FIG. 7 is a front view of the clamp, and FIG. 8 is a view showing a fastening bolt.

In the third embodiment, the U-shaped main body 2 is press-formed, and the disc spring 20 is attached to the fastening bolt 6 by the support member 2.
1 that is rotatably assembled through a U-shaped main body 2
By combining the large elastic deformation ability of the disc spring 20 with the elastic deformation ability of the disc spring 20, a larger elastic deformation ability can be expected.

In the third embodiment, when the widths of the two legs 3 and 4 of the U-shaped main body 2 are increased, when the fastening bolts 6 are to be tightened, the center of the fastening bolts 6 is adjusted. As the rotation axis, the clamp 1 is made of an H-shaped steel flange 10.
However, since the width of the U-shaped main body 2 is large, it is difficult to rotate and the main body 2 can be stably mounted.

Next, a fourth embodiment will be described with reference to FIG. FIG. 9 is a diagram showing a mounting state of the clamp.

In the fourth embodiment, the U-shaped main body 2 is manufactured by forging. Thus, the forging of the U-shaped main body 2 works when the fastening bolt 6 is tightened with a predetermined torque. Assuming that the axial force is P, the moment M acting on the U-shaped main body 2 is M = P × L. At this time, the stress σ generated in the U-shaped main body 2 is σ = M / Z (Z: section modulus), and the stress σ is the yield point strength σ of the steel material of the U-shaped main body 2.
By setting the section coefficient Z to be 50% to 80% of t, the clamp 1 that is strong against vibration can be obtained.

Next, an example of the use of the clamp 1 of the present invention will be described.

As shown in FIG. 10, a fastener 40 is welded to the U-shaped main body 2 of the clamp 1 so that the safety net can be attached to the steel frame using the fastener 40.

As shown in FIGS. 11 and 12, a fixed clamp 41 is rotatably provided on a U-shaped main body 2 of the clamp 1 via a support shaft 42. Clamp 1
Is attached to the flange portion 10 of the H-shaped steel that is the object to be clamped,
The steel pipe 50 is attached to the fixed clamp 41 of the clamp 1 and is used for various things such as supporting the steel pipe 50 on an H-shaped steel.

[0030]

As described above, according to the first aspect of the present invention, when the fastening bolt is tightened, the bending of the U-shaped body becomes 50% to 80% of the yield strength of the U-shaped body. By adopting such a section modulus, the amount of elastic deformation when tightening the fastening bolt is increased, and the elastic deformation of the U-shaped body is used to effectively absorb vibration and prevent loosening of the fastening bolt it can.

According to the second aspect of the present invention, the fastening bolt is inclined inward with respect to the U-shaped main body and screwed therethrough, so that when the fastening bolt is tightened, the fastening bolt moves with respect to the held object. Since the clamp is vertical, it can be securely tightened, and even if a large external force acts on the clamp, it is possible to prevent the fastening bolt from being bent or the clamp from coming off.

[Brief description of the drawings]

FIG. 1 is a side view of a clamp.

FIG. 2 is a view showing a mounting state of a clamp.

FIG. 3 is a diagram illustrating a moment acting on a U-shaped main body of a clamp.

FIG. 4 is a side view of the clamp.

FIG. 5 is a view showing a mounting state of a clamp.

FIG. 6 is a side view of the clamp.

FIG. 7 is a front view of the clamp.

FIG. 8 is a view showing a fastening bolt.

FIG. 9 is a view showing a mounting state of a clamp.

FIG. 10 is a side view of the clamp for explaining an example of the use of the clamp.

FIG. 11 is a side view of the clamp for explaining an example of the use of the clamp.

FIG. 12 is a diagram illustrating an example of a use of a clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp 2 U-shaped main body 3, 4 Leg part 5 Connecting part 6 Fastening bolt 10 Clamping object

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E125 AA03 AA13 AA56 AB01 AB17 AC16 CA72 EA14 EA33 3J022 DA17 DA19 EA41 EB12 EC02 ED03 FA01 FB06 FB07 FB12 GA06 GA13 GB32

Claims (2)

[Claims] 1. A U-shaped main body having two opposing legs, and a fastening bolt for fastening an object to be clamped between one of the opposing legs of the U-shaped main body and the other leg is screwed therethrough. In the clamp to be clamped, a cross-sectional coefficient is set so that when the fastening bolt is tightened, the bending of the U-shaped main body is 50% to 80% of the yield strength of the U-shaped main body. 2. The clamp according to claim 1, wherein a fastening bolt is inclined inward with respect to the U-shaped main body and screwed therethrough.