JP2000018225A - Confirmation structure of bolt looseness - Google Patents

Abstract

(57) [Summary] [Problem] To be able to visually inspect loosened bolts. SOLUTION: There is a through hole 3 drilled in a bolt head 2 in a direction perpendicular to the axis of two adjacent bolts 1 to be fastened, and a wire 4 is passed through the through hole 3. Wire 4 is tensioned in the bolt tightening direction,
This is a check structure of a bolt loosened which is locked so as not to come out of the through hole 3. Then, the wire 4 is broken, the part that has locked the wire 4 (the crimp terminal 5) has fallen off, or the wire 4 has slipped from the first locked state. Check visually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure which is advantageous for confirming loosened bolts.

[0002]

2. Description of the Related Art Many bolts are used for fastening members such as automobiles, railway vehicles, and mechanical structures. As a method of confirming the looseness of the bolt, there is a method in which a person directly turns the bolt with a spanner or the like, or strikes with a hammer or the like to discriminate between the bolts. However, these methods are not applicable to checking bolts at places where people cannot approach, and require skill, and also require a great deal of labor to check the loosening of many bolts. Therefore, as a method for solving this problem, a structure for visually confirming the loosening of the bolt has been proposed.

For example, in Japanese Utility Model Laid-Open Publication No. 52-1951, as shown in FIG. 10, a wire 22 is crossed between holes 21 provided in the heads of two bolts 20 and both ends are screwed. Tied. However, in this method, it takes time to twist and tie the wire 22, and the skill is required such that the wire 22 is cut off due to excessive twisting and started over.

As another proposal, Japanese Utility Model Application Laid-Open No. 53-720 has been proposed.
No. 60 discloses a sealing screw 30 as shown in FIG.
There is a wire through hole 32 formed in the screw head 31 in a direction perpendicular to the axis of the wire, and a wire through hole 33 formed in the terminal cover 34. An example in which this sealing screw 30 is applied to a circuit breaker is disclosed. Have been. The sealing screw 30 is fastened to the base with the terminal cover 34 interposed therebetween, and the wire 35 is passed through the wire through hole 32 formed in the screw head 31 and the wire through hole 33 formed in the terminal cover 34. Both ends are connected by lead pieces 36. However, this is
The purpose is to check whether or not the terminal cover 34 has been removed.
6 are connected. On the other hand, since the object of the present invention is the structure for confirming the looseness of the bolt, the point that the wire is tensioned and locked is different from the proposal.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a structure for confirming the loosening of bolts which is inexpensive in cost and easy to visually inspect, instead of relying on skills. It is to be.

[0006]

According to the present invention, a wire is passed through a through hole formed in each bolt head in a direction perpendicular to the axis of two adjacent bolts that are fastened. A structure for confirming looseness of a bolt, characterized in that both ends of a wire are locked so as not to be pulled out from a through hole in a state where tension is applied in a bolt tightening direction.

[0007] By changing the locking means of the wire, various types of bolt loosening confirmation structures have been invented. To enumerate them,
(1) a structure for confirming a loosened bolt in which at least one end portion of the wire is locked by a crimp terminal;
(2) A structure for confirming a loosened bolt in which at least one terminal portion of the wire is locked by a crimp terminal and is bent at a right angle from an end surface of the crimp terminal at a certain dimension, (3) the wire At least one terminal part of
A structure for confirming the looseness of the bolt which is bent and fixed at a right angle. (4) At least one end portion of the wire is
Confirmation structure of bolt loosened by welding,
(5) At least one end portion of the wire has the wire on which corrugated teeth are carved in the circumferential direction of the surface over the entire length of the locking portion, and a tongue piece on which the progress of the wire is irreversible with respect to the corrugated teeth. A check structure of bolt looseness locked by the tubular component having the bolt.

It is preferable that a notch is provided in a part of the wire where the tension is applied.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding a bolt loosening confirmation structure,
A first embodiment in which the wire 4 is locked by the crimp terminal 5 will be described with reference to FIGS. 1 shows a plan view and FIG. 2 shows a front view. A through hole 3 is opened in the bolt head 2 in a direction perpendicular to the axis of the two fastened bolts 1 adjacent to each other,
A wire 4 is passed through the through hole 3. The direction in which the wire 4 is passed is a direction in which a positive tension is applied to the wire 4 regardless of which one of the bolts 1 is loosened (the bolt head 2 rotates to the left).

If one or both of the bolts 1 are loosened, a positive tension is applied to the wire 4, so that the wire 4 is broken, the wire 4 and the crimp terminal 5 slide relatively to each other, and the crimp terminal 5 falls off. Can be visually checked.

Another embodiment of the present invention will be described. In FIG. 3, after the wire 4 is locked by the crimp terminal 5, the wire 4 is bent at a certain dimension from the end face of the crimp terminal 5 at a right angle. In this case, any change in the dimension L between the end face of the crimp terminal 5 and the portion where the wire is bent at a right angle, in which the wire 4 is broken, may be visually confirmed.

In FIG. 4, a wire 4 is bent at a right angle and locked at a position where it exits a through hole 3 of a bolt head 2.
In this case, the degree of deformation of the wire 4 bent at a right angle may be visually checked. An example of the degree of deformation is shown in FIG.

In FIG. 6, the wire 4 is locked by welding 6 at a position exiting the through hole 3 of the bolt head 2. In this case, it may be confirmed visually that the wire 4 is broken. It should be noted that welding means welding in addition to welding in general.

In FIG. 7, corrugated teeth 7 are cut in the circumferential direction of the surface over the entire length of the locking portion of the wire 4. A tongue, whose travel is irreversible, is attached and the wire 4 is locked by a tubular piece 8. In this case, the tubular part 8 in which the wire 4 is broken
May be visually confirmed.

The locking means at both ends of the wire 4 may be the same type of locking means described above at both locations, or a bolt loosening confirmation structure employing separate locking means. Good. The wire 4 is not necessarily made of metal, and may be made of, for example, resin.

As shown in FIG. 8, one end of the wire 4 is locked by welding and the other end is bent at a right angle and locked. In this case, as compared with the case of FIG. 4 in which both ends of the wire 4 are bent at right angles and locked, the deformation of the wire 4 due to the loosening of the bolt 1 appears on one side, so that there is an advantage that visual confirmation is easy.

As shown in FIG. 10, a practically used bolt loosening confirmation structure is shown in FIG. 10, in which a wire is reciprocated in a cross shape between two adjacent bolts, a wire is passed through, and both ends of the wire are twisted and connected. Therefore, the total length of the wire (wire) used is longer than that of the present invention, which requires skill in work, and the work time is also longer.
That is, it is clear that the present invention is more advantageous in terms of cost and work.

If a notch 9a or 9b shown in FIG. 9 is provided in the wire so that the wire is easily broken when the bolt is loosened and a positive tension is applied to the wire,
This is preferable because the bolt loosening detection power is increased.

[0019]

According to the present invention, since the length of the wire used is short, no skill is required for the work, and the working time is short, the cost is low and the check for the looseness of the bolt is easy.

[Brief description of the drawings]

FIG. 1 is a plan view of a bolt loosening confirmation structure according to a first embodiment of the present invention.

FIG. 2 is a front view of a bolt loosening confirmation structure according to the first embodiment of the present invention.

FIG. 3 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 4 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 5

FIG. 4 is a plan view showing a loosened state of the bolt according to the embodiment.

FIG. 6 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 7 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 8 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 9 is a plan view of a notched wire according to the present invention.

FIG. 10 is a plan view of a prior art embodiment.

FIG. 11 is a front view of an embodiment of the prior art.

[Explanation of symbols]

 1. Bolt 2. Bolt head 3. Through hole 4. Wire5. Crimp terminal 6. Welding 7. 7. Corrugated tooth Tubular part 9a. Notch 9b. Notch

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 1, 1998 (1998.9.1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a plan view of a bolt loosening confirmation structure according to a first embodiment of the present invention.

FIG. 2 is a front view of a bolt loosening confirmation structure according to the first embodiment of the present invention.

FIG. 3 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 4 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 5 is a plan view showing a bolt loosened state according to another embodiment of the present invention .

FIG. 6 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 7 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 8 is a plan view of a bolt loosening confirmation structure according to another embodiment of the present invention.

FIG. 9 is a plan view of a notched wire according to the present invention.

FIG. 10 is a plan view of a prior art embodiment.

FIG. 11 is a front view of an embodiment of the prior art.

[Explanation of Codes] Bolt 2. Bolt head 3. Through hole 4. Wire5. Crimp terminal 6. Welding 7. 7. Corrugated tooth Tubular part 9a. Notch 9b. Notch

Claims (7)

[Claims] A wire (4) is inserted into each through hole (3) drilled in each bolt head (2) in a direction perpendicular to the axis of two adjacent bolts (1). And that both ends of the wire (4) are locked so as not to come out of the through hole (3) in a state where tension is applied in the direction of tightening the bolt (1). A feature for checking bolt looseness. 2. The bolt loosening confirmation structure according to claim 1, wherein at least one end portion of the wire is locked by a crimp terminal. 3. The structure for confirming looseness of a bolt according to claim 2, wherein the wire is bent at a predetermined angle from an end face of the crimp terminal. 4. The bolt loosening confirmation structure according to claim 1, wherein at least one end portion of the wire is bent at a right angle and locked. 5. The structure for confirming looseness of a bolt according to claim 1, wherein at least one end portion of said wire is locked by welding. 6. The wire (4) in which at least one end portion of the wire (4) has a corrugated tooth (7) carved in the circumferential direction of the surface over the entire length of the locking portion, and the corrugated tooth (7). 2. The structure for confirming looseness of a bolt according to claim 1, wherein the bolt is locked by a tubular part (8) having an inner surface with a tongue piece whose traveling of the wire (4) is irreversible. 7. A bolt loosening confirmation structure according to claim 1, wherein a notch (9a or 9b) is provided in a part of the wire (4) where tension is applied. .