JPH0710541U - Loosening prevention screw - Google Patents

Abstract

(57) [Abstract] [Purpose] The purpose is to prevent loosening by the structure of the screw itself, without using spring washers or other objects, even if a force such as vibration or tension is applied to the screw. is there. [Structure] On both slopes facing each other in a screw trough, a convex portion (1) is formed on one slope and a concave portion (2) is formed on the other slope, and a screw thread is screwed so that the gap between them is gently curved. Provide so that the parts can pass. Since the crests of the female threads to be screwed are bent while being opposed to each other at the curved portions of the male thread troughs, a frictional force is generated to act as a loosening stopper for the screws.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loosening-preventing screw that is not easily loosened even when a force such as vibration or pulling is applied to the screw.

[0002]

[Prior art]

 Conventionally, to prevent the screws from loosening, spring washers have been used, the head is fixed via another object so that the screws do not rotate, or two nuts are tightened.

[0003]

[Problems to be solved by the device]

 The use of spring washers, fixing of screw heads, tightening with two nuts, etc. requires extra cost and labor, and is troublesome and uneconomical. This proposal was made to solve these problems.

[0004]

[Means for Solving the Problems]

 As shown in Fig. 1, a convex part (1) is formed on one slope of the thread trough and a concave part (2) is formed on the other slope so that the gap between the two is loosely curved and the screw thread part to be screwed can pass through. Set up. When the thread portion to be screwed is passed through the curved gap of the thread trough, the thread portion is bent along the curve as shown in FIG. Then, at this curved portion, a frictional force is generated between the thread trough and the thread ridge, which makes it difficult to slip and acts as a screw slack preventive.

[0005]

[Action]

 Since the structure of the present invention is as described above, it is possible to overcome the frictional force at the curved portion and easily tighten or loosen the screw by using a normal tool. On the other hand, even if a force such as vibration or tension is applied in the direction of the axis of the screw, it is small if it is calculated by the force in the spiral direction where the screw is cut, and the frictional force at the curved portion is larger, so the screw does not loosen.

[0006]

【Example】

 As shown in Fig. 1, a convex part (1) is formed on one slope of the thread trough, and a concave part (2) is formed on the other slope so that the gap between the two is gently curved and the screw thread part to be screwed can pass through. Set up. The curved structure of this gap need only be provided in either the male or female trough. As for the degree of curvature at the thread trough, the threaded portion to be screwed is bent at this bent portion as shown in Fig. 2, so that the elastic limit of the screw material and the distance between the male and female threads can be endured to withstand repeated use. Make a decision in consideration of the clearance. The curved structure of the present invention only needs to be provided at one place somewhere in one pitch of the thread trough. If only a thin object is screwed through the screw hole, it is enough to provide only one place in the valley near the screw head. If nuts of various thicknesses are used, if there are three peaks in the nut, this structure can be provided for every three pitches of the male thread valley. This curved structure is used not only for screws, bolts, and nuts, but also for preventing loosening of things that are tightened and fixed in a male-female fitting relationship.

[0007]

[Effect of device]

 The screws and bolts will have built-in locks by simply manufacturing and manufacturing the structure of the present proposal, and additional spring lockers and screw heads for locking locks and locks that have been conventionally required will be added. It is economical because things and work are unnecessary.

[Brief description of drawings]

1] Front view of the present invention

FIG. 2 is an enlarged sectional view of section A-A ′ in FIG.

[Explanation of symbols]

 (1) is convex (2) is concave (3) is male (4) is female

Claims (1)

[Scope of utility model registration request] 1. On both slopes facing each other at a screw trough, a convex part (1) is formed on one slope and a concave part (2) is formed on the other slope, and the two are screwed together so that the gap between them is loosely curved. An anti-loosening screw provided so that the thread portion can pass through.