JP2000027839A - Bolt with mechanism for preventing slipping off - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a bolt for preventing slipping-off, and reduce cost load, since a method for preventing slipping-off of various kinds of bolts is developed, but its method is complex. SOLUTION: A bolt 1 is so constituted that a groove part 3 is arranged on an intermediate part of a screw part, and the screw part is divided into a head screw part 4 and a tip end screw part 5, a groove width of the groove part 3 is set larger than the length of a female screw of a screwed counterpart side, and a diameter of the groove part 3 is set smaller than an inner diameter of the female screw of the screwed counterpart side. In such constituted bolt with a mechanism for preventing slipping-off, when a bolt is slipped out, the groove part 3 is advanced to the female screw part of the counterpart side, and thereby, the bolt 1 becomes unstable state. However, since there is a tip end screw part, the bolt 1 is prevented from slipping off.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting bolt or a holding bolt for various parts, and more particularly to a screw for preventing a bolt from falling off even if it is loosened by vibration or the like.

[0002]

2. Description of the Related Art Conventionally, various methods have been adopted for preventing bolts from falling off as well as preventing bolts from being loosened. However, the method of preventing the falling off is complicated and the cost is high.

[0003]

[Problem to be Solved by the Invention] Although there are cases where mounting bolts are dropped and lost and there are cases where bolts are dropped inside the device and hinders the device, simple and inexpensive bolt dropping prevention is possible. There is no way of
In many cases, no measures have been taken to prevent falling off, and in many cases it is troublesome. The present invention has been made to solve the above drawbacks.

[0004]

A groove (3) is provided in the middle of the thread of the bolt (1), and the thread is divided into a head thread (4) and a tip thread (5). The groove width of the groove (3) is made larger than the length of the female screw of the nut (6) to be tightened or the female screw of the mounting body (7). The engagement with the mating female screw will be completely released. For this purpose, the diameter of the groove (3) is made smaller than the inner diameter of the mating female screw. The basis of the present invention is based on a mechanism for preventing a bolt from falling as described below. In order for the male screw and female screw to be disengaged once and the unstable bolt (1) to come off, the tip screw (5) is further improved by vibration or the like so that the mating nut (6) or the female screw of the main body (7) can be used. And must pass through. However, in order to engage the male screw of the bolt which is once unstable and the female screw of the partner, the center line of the male screw of the bolt and the female screw of the partner is aligned, and
In addition, while maintaining that state, a force acts on the bolt in the screwing direction, and at the same time, a force for rotating in the screwing direction acts, and the bolt must be rotated until it meshes, such a phenomenon due to general vibration etc. Can not occur and the bolt cannot fall off.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in FIGS. 1 and 2 will be described below with reference to the drawings. A groove (3) is provided in the middle of the screw part of the bolt (1), and the screw part is divided into a head screw part (4) and a tip screw part (5). The groove width of the groove (3) is larger than the female screw length of the mating nut (6) or the mounting body (9) to be screwed in, and the groove diameter is smaller than the inner diameter of the mating female screw. The present invention is configured as described above. When this is used, as shown in FIGS. 1 and 2, the screw is tightened with the head screw portion, and the tip screw portion only prevents the bolt from falling off.

Hereinafter, an embodiment of the present invention shown in FIG. 3 will be described with reference to the drawings. If the shape of the bolt head (2) is a disk or the like, it can be applied to the level adjuster (9) such as a table to prevent the level adjusting screw (10) from falling off.

[0007]

Since the present invention is advantageous in terms of cost, bolts with more prevention of falling are used, it is expected that bolts and nuts will be prevented from falling, and the chances of dropping and loss of bolts will be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a front view of the present invention.

FIG. 2 is a front view of the present invention.

FIG. 3 is a front view of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bolt 2 Bolt head 3 Groove part 4 Head side screw part 5 Tip screw part 6 Nut 7 Main body 8 Attachment 9 Level adjuster 10 Level adjustment screw

Claims (1)

[Claims] 1. A bolt (1) is provided with a groove (7) in the middle of a thread, and the thread is divided into a head thread (4) and a tip thread (5). (B) The groove width of the groove (3) is larger than the female screw length of the nut (6) or the main body (7) to be screwed. (C) The diameter of the groove (3) should be equal to or smaller than the inner diameter of the female screw to be screwed. A bolt with a falling-off prevention mechanism characterized by the above configuration.