JP2993562B2 - Nut protection cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective cap for a nut, and more particularly, to a nut and a bolt which fasten a base material by loosening a bolt.
Alternatively, the present invention relates to a protective cap to be put on a nut for the purpose of preventing tamper removal.

[0002]

2. Description of the Related Art Recently, there has been a tendency that damage such as falling down of a tower by loosening or removing bolts of the tower continues, and it is necessary to prevent such damage. As a countermeasure, external construction means such as laying a strict protection net that can not easily enter the place where the tower is erected can be considered, but it would be best if all could be done. In some cases, various problems such as space, construction, etc. may occur, and this is not always an advantageous measure.

There are various types of bolt / nut loosening stoppers provided, for example, a double nut or a specially designed loosening stopper attached to a screw portion of a bolt. However, they can only prevent loosening caused by vibrations of the base material to which the bolts and nuts are fastened, and cannot prevent artificial loosening such as mischief.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention
It is an object of the present invention to prevent a bolt nut from being loosened for mischief or the like by providing a means for preventing the bolt nut from being easily contacted from the outside.

[0005]

In order to achieve the above object, the present invention comprises a conical bottomed cylindrical body having a central hole formed in a base material through a threaded portion of a bolt fastened by a nut. together with the inner peripheral edge of the central hole is formed in a spiral portion corresponding to Wanpitchi the threaded portion of the bolt, continuous or ribs alone Izu convex portions on the outer peripheral surface at Jo Tokoro intervals and the recess of the bottomed cylinder
There is provided a nut protection cap characterized in that one of them is formed. Therefore, since the nut can be covered and wrapped, the nut cannot be touched even if it is touched for mischief. In addition, if the tool is not a dedicated tool, it cannot be turned.

[0006] In the above, the outer peripheral surface of the bottomed tubular body is a waveform cross section projections and recesses are continuous alternately, also the length of the re blanking of the cone slopes spread umbrella-like cone high It is characterized by being formed shorter than the length.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As a first embodiment of the present invention, as shown in FIGS. 1 and 2, two nuts 5 and 5 a are mounted on a screw portion 4 of a bolt 3 to which a new or existing base material 1 or 2 is fastened. The nut is prevented from loosening. The screw portion 4 of the bolt 3 has a conical bottomed cylindrical body.
Cap 6 a made of is capped so as not to easily be removed. Incidentally, nuts 5,5a bears the cap 6 a is not limited to the double nut,
A single nut may be used, in which case the cap 6
It goes without saying that suffices differing configuration the axial length of a. Furthermore, even the cap 6 a are not intended surround the entire nut 5, 5a, for example, a nut 5a and the nut 5
May be a part that wraps a part of.

[0008] The cap 6 a accommodates the nut 5,5a,
The screw hole 4 of the bolt 3 is provided with a center hole 7 through which the spiral portion 8 corresponding to at least one pitch of the screw of the screw portion 4 of the bolt 3 is formed so as to start and end at the cutout 9. I have. The notch 9 is open in a substantially V-shape in the vertical direction .

[0009]

[0010] peripheral surface extending in an umbrella-like caps 6a Waso (skirt portion 15) is formed in a waveform cross section. That is, the skirt portion 15 has a wavy cross section in which the convex portions 16 and the concave portions 17 are alternately continuous in the circumferential direction. The convex portions 16 and the concave portions 17 extend over the entire length of the skirt portion 15 in the height direction.
The protruding portion 16 is formed as a tool hooking portion 12 having the same function as the claw portion 11 and for improving the rigidity of the bottomed cylinder. By forming the continuation of the convex portion 16 and the concave portion 17 in an annular shape, the strength of the conical body is improved, and the skirt portion 15 cannot be easily crushed .

Further, a second embodiment of the present invention will be described. As shown in FIGS. 3 and 4 , a cap 6b is formed in a conical body and a plurality of ribs are provided on a skirt portion 15 which expands in an umbrella shape. 18 are integrally formed in the axial direction at regular intervals in the circumferential direction. The rib 18 may be formed over the entire height of the skirt portion 15, but is formed as a flat surface except for a part. The rib 18 serves as the tool hooking portion 12 having the same function as the claw portion 11 and the convex portion 16, and is formed to improve the rigidity of the bottomed cylindrical body. By forming the ribs 18 at predetermined intervals in an annular shape, the strength of the cone is improved,
The skirt 15 cannot be easily crushed. The other configuration is the same as that of the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof will not be repeated.

Although a special tool for turning the cap 6 is not shown, for example, a substantially U-shaped or U-shaped head which surrounds the outer peripheral surface of the bottomed cylindrical body in a diametrical direction is formed.
One end of the head may be bent in a key shape and a handle may be provided at right angles to a substantially central portion of the head. Also, cap 6
As a special tool for turning the a and b, as shown in FIGS. 4 and 6, a head 21 having a conical hole 20 similar to the conical shape of the caps 6a and 6b is formed. On the inner peripheral surface of the hole 20, a streak-like engaging concave portion 22 that engages with the convex portion 16 or the rib 18 is engraved. Head 2
1 is provided with a shaft portion 23 and an appropriate handle is added thereto to form a special tool 24.

[0013] Thus, the nuts 5 and 5a are screwed into the screw portions 4 of the bolts 3 to cover and cover the nuts 5 and 5a, and the caps 6 which cannot be easily unscrewed without special tools are attached. The bolt nuts 3 and 5 are prevented from being unraveled or unscrewed for the purpose of mischief.

[0014]

According to the present invention described above, a new installation or
Conceales the nuts of the bolts and nuts that fasten the base material regardless of the existing one with a conical bottomed cylinder, and the bottomed cylinder can be unwound or unscrewed without using special tools. Since it is impossible, it is possible to prevent mischief such as causing the bolt and nut to be twisted or unscrewed. Further, if a construction procedure of always attaching the cap after the reliable fastening operation of the bolt and nut is adopted, it can be used as a means for confirming the end of the operation that the bolt and nut with the attached cap are securely fastened. Further, since the nut is covered, the nut and the threaded portion of the bolt to which the nut is screwed can be protected from foreign matter. In addition, a conical bottomed cylinder
The outer peripheral surface has a corrugated cross section or ribs at predetermined intervals
By being formed, the outer peripheral part expands like an umbrella,
It is easy to form a tool engagement part for turning, and
The turning tool itself forms an umbrella-shaped recess such as a wavy section.
It has the advantage that it can be easily manufactured because it is sufficient.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional front view in the mounting example of FIG. 1;

FIG. 3 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional front view in the mounting example of FIG. 3;

[Explanation of symbols]

1, 2, base material 3, bolt 4, screw part 5, 5a, nut 6a, 6b, cap 7, central hole 8, spiral part 9, notch part 10, slit 11, claw part 15, skirt part 16, convex Part 17 ... recess 18 ... rib 24 ... dedicated tool

Claims (3)

(57) [Claims] 1. A conical bottomed cylinder having a central hole formed through a threaded portion of a bolt fastened by a nut to a base material, and an inner peripheral edge of the central hole corresponds to one pitch of the threaded portion of the bolt. It is formed in a spiral portion of the continuous or ribs alone Izu convex portions on the outer peripheral surface at Jo Tokoro intervals and the recess of the bottomed cylinder
A nut protection cap characterized in that either one is formed. 2. The nut protection cap according to claim 1, wherein the outer peripheral surface of the bottomed cylindrical body has a corrugated cross section in which convex portions and concave portions are alternately continuous. 3. The nut protection cap according to claim 1, wherein the length of the rib is shorter than the height of the umbrella-shaped slope of the cone.