JPH0738734U - Grooved nut - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent loosening of nuts that connect parts or parts of machines or structures, or main parts and parts. [Structure] A semi-spherical part is connected to one side of a conventional hexagonal nut, and a normal screw that is integrated with the hexagonal nut is cut on the semi-spherical part. Cut. It becomes gradually narrower toward the outlet from the connecting part of the hemisphere and the hexagon nut. When the nut is tightened by this, the hemispherical 2 is pushed outward and the reaction force of this strong elastic force pinches the bolt from all sides, increasing the friction coefficient, which causes vibration and rotation of the rotating shaft. The nut and bolt are securely fastened without loosening even after repeated rotations.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw part used for connecting parts or parts of a machine or structure, or a body and parts, and more specifically, to a "locking" action of a nut.

[0002]

[Prior art]

 Conventionally, a hexagon nut shown in FIG. 4 is known as this type of nut.

[0003]

[Issues to be solved by the device]

 Conventional nuts have the problem that, even if they are properly tightened, they loosen due to vibration and repeated rotation of the rotating shaft.

Conventionally, there has been a means for preventing loosening, but it is still not perfect, and rather, it has been to prevent the nut from falling off or being lost after it has been loosened. Therefore, there is a problem that there is no nut that completely prevents loosening.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to prevent a tightened nut from loosening due to vibration and repeated rotation of a rotating shaft. It is intended to provide a nut that can be securely fixed.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the nut of the present invention forms a one-piece body (Fig. 3) in which a semi-spherical portion is joined to a conventional hexagonal nut, and a screw is cut in the central portion of the nut. The sphere has a structure in which several grooves are cut in the vertical direction and the diameter is gradually narrowed from the joint with the hexagon nut to the outlet.

[0007]

[Operation] The nut is no different from the conventional usage, but it is slightly and gradually narrowed toward the exit of the hemispherical part with a vertical groove, so it is not fastened with bolts and nuts. When tightening a member, the rotation of the nut will be slightly heavy due to the force (elastic force) that the part with the semi-spherical groove pushes and spreads to the outer piece. Prevents the nut from loosening.

[0008] The loosening of the nut due to vibration or the like is surely prevented by the sandwiching force (elastic force) of the hemispherical portion.

[0009]

【Example】

 The method of implementation is no different from the conventional method, and the member to be fastened is tightened using a spanner or the like.

1A to 3, the nut A is made of, for example, a hard steel wire rod or a carbon steel steel for machine structure, and has a shape in which a substantially hemispherical portion is connected to one side of a hexagonal nut. Formed into a thread for cutting a thread in the center of this. More specifically, it is gradually narrowed from the junction of the hexagon nut and the approximately hemisphere toward the outlet.

Then, the groove 1 is cut in a vertical cross shape in the semi-spherical shape of the nut. As a result of this, as the nut is tightened, the outlet is narrowed, so 2 is expanded outward, and this expanding force becomes an elastic force that sandwiches the bolt from all sides, and a frictional force that prevents the nut from loosening. Has become.

It should be noted that the cross-shaped vertical groove cut in the hemispherical portion may be made radial from the center as shown in FIG. 1, and the tightened nut may be seated by changing the direction as shown in FIG. 1 (b). It may be formed in a winding direction that catches on the surface and further prevents the rotation.

[0013]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

Since it has the shape as claimed in claim 1, the direction of the nut fitted in the bolt is obvious.

According to the structure of claim 2, since the diameter of the nut is gradually narrowed toward the exit of the hemispherical portion, the nut is loosened due to the vibration (rotation of the rotary shaft) and the repeated rotation of the rotary shaft due to the force (elastic force) that clamps the bolt. Stop. Therefore, it contributes to prevent accidents and failures.

[0016] Looseness of the screw can be caused on the load contact surface of each of the screw surface, the seat surface of the bolt head, the seat surface of the nut, the joint surface of the members to be fastened, when a fluctuating external force is applied to the screw fastening body. The pretension decreases and begins to loosen due to the small sagging of the unevenness. This initial loosening is prevented by increasing the elastic force sandwiched by the hemispherical parts, that is, by increasing the friction coefficient.

As a tool for tightening the nut, a conventional spanner or the like is sufficient, and no special tool or the like is required.

[Brief description of drawings]

FIG. 1 is a plan view of a nut.

FIG. 2 is a side view of a nut.

FIG. 3 is a perspective view of a nut.

FIG. 4 is a perspective view of a conventional nut.

[Explanation of symbols]

 A Nut B Perspective view of conventional nut 1 Vertical groove 2 Hemisphere 3 Screw

Claims (2)

[Scope of utility model registration request] 1. A nut having a shape in which a substantially hemispherical portion is connected to one side of a hexagonal nut, and this hemispherical nut has several grooves cut in the longitudinal direction. 2. A nut having a semi-spherical shape is also threaded in one piece from a hexagonal nut, and has a structure in which the diameter is gradually narrowed from the junction of the hexagonal nut and the semi-spherical shape toward the outlet. nut.