JP3245558B2 - Clamp for tightening force adjustment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp most suitable for a clamp used for a vibration isolator or a coupling device attached to a diagonal member of a cable-stayed bridge or a rope of a suspension bridge, a spacer clamp for a transmission line, and the like.

[0002]

2. Description of the Related Art When attaching a vibration isolator or the like to a diagonal member of a cable-stayed bridge or a hanger rope of a suspension bridge, a clamp for gripping the diagonal member or a hanger rope is used. As this clamp, a clamp that clamps a hanger rope between a detachable clamp body and a lid is generally used. Clamping portions are provided at both ends of the arc-shaped clamp body and the lid portion, and bolts are passed through the clamping portions of the clamp body and the lid portion, and nuts are screwed into the bolts and tightened.

[0003]

On the other hand, cables used for diagonal members of cable-stayed bridges and hanger ropes for suspension bridges are covered with a plastic resin such as polyethylene or polyurethane for the purpose of preventing corrosion. Therefore, when such a clamp is used for a long time, creep is easily generated in the hanger rope due to the clamping force of the clamp or a vibration phenomenon, and the hanger rope itself may be thinned. as a result,
If the tightening force of the clamp decreases, the bolts must be retightened. However, in the above-mentioned clamp, it is difficult to easily confirm a decrease in the tightening force even if the wire becomes thin due to creep. In practice, the reduction in the clamping force is not noticeable until the clamp slips or falls off the hanger rope.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a clamp capable of easily confirming a decrease in the clamping force when the clamping force has decreased and preventing the clamping force from decreasing.

[0005]

According to the present invention, a clamp applies a tightening force to a tightening shaft by a repulsive force of a spring and uses a tightening force defining member for defining an optimum tightening length of the spring. Achieves the above objectives. That is, the clamp of the present invention is a clamp that clamps a material to be clamped between a clamp body and a lid, and clamps each of the clamped portions of the clamp body and the lid using a clamping shaft. A tightening shaft is penetrated through the tightening portion, and a male screw is formed at one end of the tightening shaft. The screw structure tightens the tightening portion of the lid, and has a spring receiver at the other end. Between the receiving part and the tightening part of the clamp body, there is a spring which is externally fitted to the tightening shaft, and which comes into contact with one end of the spring to provide a space between the spring receiving part and the clamp body when proper tightening is performed. And a clamping force defining member having a corresponding length.

In the clamp of the present invention, various linear members, such as a rope made of a metal wire, can be tightened. The clamp body and the lid are each provided with a recess corresponding to the outer shape of the material to be tightened. For example, when gripping a hanger rope for a suspension bridge having a circular cross section, a semicircular recess is provided in each of the clamp body and the lid, and the hanger rope is sandwiched between the recesses.

It is preferable that the clamping mechanism of the clamp be provided at one or both ends of the clamp. For example, when gripping the hanger rope, the clamp body and the lid are formed in an arc shape, and the two are abutted to form an annular shape.
At this time, a fastening mechanism may be provided at two places at the butted portions (both ends) of the main body and the lid. When a clamping mechanism is provided only at one end of the clamp, one end of the clamp body and the lid may be connected to each other by a hinge so as to be openable and closable, and a clamping mechanism may be provided at the other end.

[0008] One end of the tightening shaft is configured to tighten the tightening portion of the lid portion, and the specific configuration is as follows. A male screw is formed at one end of the tightening shaft, a through hole or notch of the tightening shaft is formed at the tightening portion of the lid, the male screw portion is fitted into the through hole (notch), and a nut is screwed into the male screw to tighten. . A male screw is formed at one end of the tightening shaft, a female screw is formed at the tightening shaft of the lid, and the male screw is screwed into the female screw to tighten the lid. At this time, it is preferable to form a head-shaped projection of the bolt on the other end of the tightening shaft so that the tightening shaft can be easily turned.

The shape of the tightening force adjusting member is not particularly limited as long as it has a spring abutting portion that abuts on the end of the spring and a defining portion that defines the tightening length of the spring. For example, the spring contact portion may be a thin annular member, and the defining portion may be a rectangular plate-like member that is integral with the spring contact portion and extends in the axial direction. With this configuration, the spring contact portion can be penetrated by the tightening shaft, and the tightening force defining member does not fall off the tightening shaft. Then, the length of the defining portion may be a length corresponding to the distance between the spring receiver and the clamp main body when proper tightening is performed. If the clamp tightening force decreases due to creasing or other thinning of the clamped material, between the tightening force adjusting member and the spring receiver, or between the tightening force adjusting member and the tightening portion of the clamp body. A gap is formed, and by visually checking the gap, a decrease in the tightening force can be recognized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to a vibration isolator for a hanger rope of a suspension bridge as an example. FIG. 1 is a plan view of the apparatus, and FIG. 2 is a front view thereof.

This vibration isolator is provided with clamps 1 for grasping a hanger rope of a suspension bridge at both ends, and the two clamps 1 are connected by a vibration isolating rubber 2 at a central portion, so that vibration transmitted from the clamp 1 is buffered. .

In this clamp 1, an arc-shaped clamp body 3 and a lid 4 are connected via a hinge 5 so as to be openable and closable. A semicircular concave portion is formed on each inner periphery of the main body 3 and the lid portion 4, and when the both are closed, a space 6 having a circular cross section for holding the hanger rope is formed.

The clamp 1 is provided with a tightening mechanism at a position substantially opposed to the hinge 5 when the main body 3 and the cover 4 are closed. At each end of the main body 3 and the lid 4, flat fastening parts 7, 8 are formed, and a fastening mechanism is constituted by using a fastening shaft 9 passing through the fastening parts 7, 8. That is, a through hole for the tightening shaft 9 is formed in each of the tightening portions 7 and 8. In this example, two clamping shafts 9 were used for each clamp (see FIG. 2). The tightening shaft 9 has a male screw formed at one end and a flange-shaped spring receiver 10 at the other end. The male screw side passes through the tightening portion 8 of the lid, and the spring receiver 10 faces the tightening portion 7 of the main body. are doing. A compression spring 11 is externally fitted to the tightening shaft 9 between the spring receiver 10 and the tightening portion 7 of the main body. Lid 4
When the nut is screwed through the tightening shaft 9 into the tightening portion 8 of the lid and the male screw is screwed into the male screw, the spring receiver 10 moves away from the tightening portion 7 of the main body by the repulsive force of the spring 11. When pressed, the body 3 and the lid 4 are tightened.

Further, a fastening force defining member 13 for defining a fastening force is mounted between the spring receiver 10 and the fastening portion 7 of the main body. The tightening force regulating member 13 has a thin annular spring contact portion 13A (see FIG. 2) and a rectangular plate-like regulating portion 13B extending in the axial direction integrally with the contact portion 13A. The regulating part 13B is the spring contact part 13.
A pair is provided at a position facing A. The spring contact portion 13A is penetrated by the tightening shaft 9 and is sandwiched between the end of the spring 11 and the tightening portion 7 of the main body, and the tip of the defining portion 13B faces the spring receiver 10. The fastening force defining member 13 is preferably made of a metal such as steel so as to withstand the fastening force.

The length of the spring 11 when the nut 12 is screwed into the tightening shaft 9 to obtain the optimum tightening force is equal to the length of the tightening force defining member 13 (from the spring contact portion to the tip of the defining portion). Up to the length of the spring holder 10)
Optimum tightening force can be obtained by screwing the nut 12 until it comes into contact with the nut.

When the hanger rope is thinned by creep and the tightening force of the clamp is reduced, the defining portion 13
Since a gap is formed between the tip of B and the spring receiver 10, a decrease in the tightening force can be easily confirmed by visually checking the gap. The gap can be checked using binoculars or the like from the bridge. When this gap is generated or when the gap becomes a specified value (for example, 3 mm) or more, the tightening force of the clamp can be appropriately maintained by retightening the nut 12. Even when retightening is performed, a predetermined tightening force can be obtained by performing tightening until the end of the defining portion 13B comes into contact with the spring receiver 10, so that excessive or insufficient tightening can be prevented.

Although the above description has been made with reference to an example of a vibration isolator for a hanger rope of a suspension bridge, the clamp of the present invention can be used in various other fields.

[0018]

As described above, according to the clamp of the present invention, it is possible to easily confirm a decrease in the tightening force even when the tightened material is thinned, and to increase the tightening mechanism. Workability can be improved. Further, even if retightening is performed, excessive or insufficient tightening can be prevented, and an optimum tightening force can be applied to the clamp.

[Brief description of the drawings]

FIG. 1 is a plan view of a hanger rope vibration isolator including a clamp of the present invention.

FIG. 2 is a front view of a hanger rope vibration isolator including the clamp of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Clamp 2 Anti-vibration rubber 3 Main body 4 Lid 5
Hinge 6 Space 7 Tightening part 8 Tightening part 9 Tightening shaft 10 Spring receiver
11 Compression spring 12 Nut 13 Tightening force regulating member 13A Spring contact part 13
B Regulations

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Okumoto 2-6-3 Otemachi, Chiyoda-ku, Tokyo Nippon Steel Corporation (72) Inventor Takashi Okamura Toda, Kitagawara, Itami-shi, Hyogo 20-2 Asahi Metal Seiko Co., Ltd. (56) Reference: Japanese Utility Model Laid-Open Hei 3-83430 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 3/10 E01D 19/10

Claims (2)

(57) [Claims] 1. A clamp which clamps a material to be clamped between a clamp body and a lid, and clamps each of the clamping portions of the clamp body and the lid with a clamping shaft, wherein the clamp body is clamped. A tightening shaft is penetrated through the attaching portion, the tightening shaft has a male screw formed at one end, the screw structure tightens the tightening portion of the lid, and has a spring receiver at the other end. Between the clamp portion of the clamp body and a spring that is externally fitted to the tightening shaft, it corresponds to the distance between the spring receiver and the clamp body when it abuts one end of this spring and performs appropriate tightening. if the length of
A clamp for adjusting a tightening force, comprising a tightening force defining member defined by an outer periphery of a spring. 2. A fastening force regulating member comprising:
Appropriate tightening is performed integrally with the contact part and this spring contact part.
The distance between the spring receiver and the clamp body when
And a pair of rectangular members extending in the axial direction.
Claim 1
The clamping force adjustment clamp described.