JPH066272Y2 - Loosening prevention bolt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bolt with a lock for preventing movement between a bolt and a female screw screwed into the bolt.

(Prior Art) As a conventional bolt / nut locking mechanism, for example,
A leaf spring is used as a washer, such as a spring washer or a chrysanthemum washer, and it has a special shape, or a leaf spring or wire is inserted into the thread of the bolt protruding from the nut. For nuts that prevent rotation, for a bolt or one of the nuts, a slit that is orthogonal to the thread is provided, and after screwing the nut, a rod-shaped wedge is driven into the slit to crush the thread. There are many proposals of various types such as a type in which a set screw is penetrated and the tip thereof is pressed against a bolt and other parts.

(Problems to be solved by the invention) In such various conventional loosening prevention mechanisms, the loosening prevention is completely performed after fastening, as in the case of use in a steel tower for high-voltage power transmission lines, for example. In addition, it dismounts easily when disassembly is required, and since a huge number is used, it must be possible to provide it at a low price, and the work of mounting and dismounting must be performed easily. There was nothing that satisfied all the conditions such as availability.

For this reason, in steel towers for high-voltage power transmission lines, the work of checking the bolts for looseness and re-tightening is performed regularly for each steel tower, which requires a great deal of labor and cost. There are problems such as high danger due to work at high places and work near high-voltage transmission lines.

The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to provide a bolt with a locking member which satisfies all the conditions of the bolt for the high voltage transmission line tower as described above.

(Means for Solving the Problem) The feature of the bolt with locking device of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is that a through hole is formed in both side surfaces of the shaft portion of the bolt. Equipped with a long hole, a tapered taper shape that can be inserted into the long hole, and a wedge plate with a bendable tip, and the bolt is threaded into a female screw to pass therethrough, and the protruding portion on the tip side of the bolt is inserted. The wedge plate is inserted into the elongated hole and the tip of the wedge plate can be bent.

(Operation) In the bolt with lock of the present invention, the shaft portion of the bolt is threadedly engaged with the female screw of the nut or the other so as to penetrate, and the wedge plate is inserted into the long hole in a sufficiently tightened state, After pushing in, the tip of the wedge plate that penetrates through the slit and projects to the opposite side is bent so as to wind around the shaft of the bolt, and the wedge plate is retained.

As a result, the female screw for the bolt is brought into a state in which one side of the wedge plate is in contact with the end face, and movement of the female screw toward the tip side of the bolt shaft portion is prevented. On the other hand, at the time of removal, the wedge plate can be pulled out by straightly extending the bent wedge plate tip, and the female screw can be loosened toward the tip end side of the shaft portion by the pulling out.

(Example) Next, an example of an example of the present invention will be described with reference to the drawings.

In the figure, 1 is a bolt head, 2 is a shaft portion, and 3 is a male screw molded on the shaft portion. Both ends of the shaft portion 2 are opened at a tip end thereof in a direction orthogonal to the longitudinal direction thereof, and the shaft portion 2
A long slit-shaped long hole 4 is formed on the longitudinal direction side. In this embodiment, when forming the elongated hole 4, the shaft portion 2
Has a pair of protrusions 2a and 2b, and a pin 5 is penetrated between the ends to fix the bridge 5 in a bridging manner. The portion surrounded by both protrusions 2a and 2b and the pin 5 is not the elongated hole 4. ing.

In addition to this, as shown in FIG. 5, a long hole 4 having both ends opened on the circumferential surface of the shaft portion 2 is formed by drilling at the tip of the shaft portion 2 in which a male screw 3 is molded as a whole. It's okay.

This bolt with lock is equipped with a wedge plate 6 for inserting into the slot 4. The wedge plate 6 is formed by folding a steel plate member 7 in two and stacking the plate members 7 on each other, and a taper edge 6b is formed on the end side opposite to the folded-back part 6a to form a taper edge 6b. Has been done. The plate-like thickness is such that it can be easily inserted into the slit 4. Further, chamfered tapered surfaces 7a and 7b are formed on the insides of both ends where the folded plate material 7 overlaps with each other, and the insides of the ends are widened.

As the female screw, for example, a nut 8 is screwed into the male screw 3 of the shaft portion 2. It is preferable that the nut 8 is integrally formed with a short tubular neck 9 so as to be molded.

When using the bolts with locks constructed as described above, as shown in FIGS. 3 and 4, the shaft portion 2 is penetrated through the bolt insertion holes 10 and 11 of the objects A and B to be fastened to the opposite side. The nut 8 is screwed and fastened from the tip of the shaft portion 2 protruding to the end. After sufficiently fastening, the wedge plate 6 is inserted into the slit 4 from one side, and is sufficiently press-fit (shown in FIG. 1). After that, the two plate members at the tip of the wedge plate 6 are pushed toward both sides in the direction of opening each other, and bent along the outer periphery of the shaft portion 2 to prevent the shaft member 2 from coming off (shown in FIGS. 3 and 4). As a result, the state in which one side of the wedge plate 6 is pressed against the end surface of the neck 9a of the nut 8 is maintained,
Loosening of the nut 8 with respect to the bolt is prevented.

Further, when the fastening is released, the nut 8 can be removed by immediately extending the tip of the wedge plate 6 and pulling it out.

In addition, in the above-described embodiment, the wedge plate in which the plate material is folded back to be doubled is used, but as shown in FIG. 6, two plate materials 7 and 7 may be stacked and crimped or spot welded. Alternatively, as shown in FIG. 7, a single plate member 7 may be a single plate member. Further, as shown in FIG. 8, a piece 13 may be fixed to the projecting pieces 2a and 2b by spot welding 12 instead of the pin 5. Further, as shown in FIG. 9, in addition to the nut, the loosening can be stopped by screwing into a female screw 15 which is opened through the structural member 14 such as a plate material.

(Effects of the Invention) As described above, the bolt with locking device of the present invention is provided with elongated holes through both sides of the shaft end of the bolt, through which tapered wedge plates are inserted. By bending the protruding end along the outer periphery of the shaft to prevent it from coming loose, the bolt is prevented from loosening.Therefore, it does not damage the object to be fastened and does not damage the thread of the bolt. And because it can be easily removed when necessary, and because the structure is simple,
It does not cost much and can be reused after removal,
Especially, when it is used for assembling a steel tower for a high voltage transmission line, regular re-tightening work is completely unnecessary, and the economical effect is extremely large. Furthermore, other than the above, aircraft and transportation vehicle equipment, bridges, iron cylinders, chimneys, nuclear power plants, thermal power plants, chemical plants, etc., severe locations such as vibration and shock, and locations that may lead to a major accident if loosened. , High places and other places where inspection is difficult,
It is especially effective for radiation, high temperature, high voltage, dangerous materials, environment and other locations where on-site inspection is difficult, and locations where the number of bolts is large and much labor is required for inspection.

[Brief description of drawings]

1 is a perspective view showing a wedge insertion state after fastening, FIG. 2 is an exploded perspective view, and FIG.
FIG. 3 is a sectional view of the fastening state after bending the wedge, FIG.
FIG. 5 is a plan view of the same, FIG. 5 is a perspective view showing a bolt of another embodiment, FIGS. 6 and 7 are perspective views showing different examples of wedge plates, and FIG. 8 is another elongated hole portion. FIG. 9 is a perspective view of an example, and FIG. 9 is a sectional view showing another fastening and locking state. A, B ... Fastener, 1 ... Bolt head, 2 ... Shaft,
3 ... Male screw, 4 ... Oval hole, 5 ... Pin, 6 ... Wedge plate, 7 ... Plate material, 8 ... Nut, 9 ... Neck, 10, 11 ... Bolt insertion hole.

Claims (1)

[Scope of utility model registration request] 1. A bolt plate having a long hole which is opened through both sides of a shaft portion of the bolt, has a tapered taper shape which can be inserted into the long hole, and has a bendable tip. A bolt with loosening prevention, which is threadedly fitted to the bolt and penetrated, and a wedge plate is inserted into the elongated hole at the protruding portion on the tip side of the bolt so that the tip can be bent.