JPH062022Y2 - Spring cap - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to the tightening and fixing of bolts and nuts for machine assembly and for tightening wooden parts, and particularly when the tightening of a member to be tightened is loose. The present invention relates to a spring-loaded cap that can be re-screwed and re-tightened and can always maintain a tightened state.

[Conventional technology]

Conventionally, this kind of loosening tool has a nut fitting part formed by spring extension when tightening an object with a hexagonal nut, fixing one end of the spring to the upper body, and pinning the pin hole on the bolt. There is known a structure in which a pin is inserted into a through groove to prevent the pin from falling off by a groove corrugation and a notch and to prevent the pin from loosening (for example, see Japanese Utility Model Publication No. 30-2507). Separately, it is also known that a mounting nut is screwed to a mounting bolt, a fitting spring having upper and lower protrusions is interposed, and the protrusion is fitted and fixed in a circular groove provided in both nuts. There is.
(See, for example, Japanese Utility Model Laid-Open No. 54-124861) [Problems to be Solved by the Invention] Among the problems described in the prior art, in the former case, one end of the spring is fixed to the body to prevent loosening after the object is tightened with the bolt nut. Although it can be loosened by inserting and installing a pin while fitting it to the nut with the extension extended at one end as a fitting part, in order to make this effective, the thickness of the spring is a problem. ,
If it is thick, tightening will be incomplete and idle, and it will be difficult to tighten, and if it is thin, there will be a difficulty that it will not be able to fully fulfill the loosening function, and the complexity of forming the spring extension along the hexagon nut. Also had.

In the latter case, the bolt nut can theoretically be inexpensively and easily fixed by a simple operation, but in practice, the fitting spring washer tip protrusion should be fitted to both nut round grooves in good timing. However, there is a problem in that it is impossible to perform sufficient tightening at the time of insertion and that the protrusion is damaged when the tightening operation is forcibly performed.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to form a cap having the same shape, and to provide a spring in a locking hole provided at the opposite tip positions thereof. An object of the present invention is to provide a cap with a spring, which is formed by fixing a hook-shaped portion formed at a relative position of a free end and which can be re-screwed and re-tightened not only for tightening but also for tightening loosening.

[Means for Solving the Problems]

In order to achieve the above object, the spring cap according to the present invention includes a washer fitted to a bolt attached to a tightening wooden part, a spring having opposite ends provided in a hook shape. At the opposite positions of the tips of the diamond-shaped flat surfaces having holes for inserting bolts on the upper and lower surfaces, there are provided attachment holes for fixing the hook portions of the spring tips, and a U-shaped hanging in the diamond-shaped flat longitudinal direction. The upper and lower caps are formed with walls, and spring hook-shaped portions are integrally fixed to the engaging holes of the upper and lower caps, and the upper and lower nuts are tightened.

[Action]

After mounting the bolt on the tightening wooden part, fitting the washer and tightening or screwing with the lower nut, form the same shape, and then the spring end hook shape in the engaging hole provided at the opposite end position of the lower cap. A spring-loaded cap is formed by fastening and unifying the parts, and the spring-loaded cap is inserted through the hole formed in the lower flat surface and then the spring-loaded cap is pressed and the upper nut is screwed and tightened. When released, the hanging wall formed in a U shape in the longitudinal direction of the cap comes into contact with the corner surfaces of the upper and lower nuts.
To prevent loosening after tightening, the tightening wooden part is prevented by the tensioning force of the tightening spring, but even if the loosening state occurs due to aging, the spring of the cap with spring functions sufficiently to allow the nut to function. It can be re-screwed in and tightened, and can always maintain the tightened state.

〔Example〕

 Examples will be described with reference to the drawings.

1 and 2, the caps 1 and 8 each have a so-called diamond-shaped surface having a flat surface with a triangular shape at both ends and a vertical wall having a U-shape in the longitudinal direction, and the bolt 3 is inserted into the flat surface. The holes 10 are formed in the same shape and are formed so that the flat surfaces of the upper and lower caps 1 and 8 are back to back when used. Further, holes 4 and 4 are provided at positions where the tips of the upper and lower caps 1 and 8 face each other so as to engage a tip hook portion 11 of a spring 5 described later.

As described above, the spring 5 is formed with hook-shaped portions 11 and 11 at upper and lower free end portions facing each other, and the upper and lower caps 1 and 8 are formed.
It is fixed to the tip holes 4 and 4, and is integrally formed with the lower caps 1 and 8 to form a spring cap.

It is the same as in the prior art that the bolt 3 mounted on the tightening wooden portion 7 is fixed by tightening the lower nut 9 through the washer 6.

After the lower nut 9 is fixed, the spring-equipped cap integrally formed with the spring 5 and the upper and lower caps 1 and 8 is inserted into the bolt 3 through the hole 10 provided in the flat surface and fitted therein. At this time, since the opposing vertical walls (U-shaped) of the upper and lower caps 1 and 8 are formed so as to make surface contact with the nut side surface,
The tension of the spring prevents the nut from loosening. The spring-loaded cap is inserted into the lower nut 9 through the bolt 3, and the upper nut 2 is mounted. The loosening of the fastening of the upper and lower nuts 2 and 9 faces the contact surface between the cap hanging wall surface and the nut side surface described above. The tension state of the spring 5 is maintained by the tension of the spring 5 attached to the position.

When the tightening wood part has deteriorated over time, that is, when a loose state caused by contraction of wood fibers and tissue due to drying occurs, re-tightening of the upper and lower nuts 2 and 9 is performed by tightening the spring on the cap. It will be possible due to the remaining capacity.

[Effect of the present invention]

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

1. The contact surface between the nut side surface and the cap having the facing hanging wall,
A spring-loaded cap is constructed by engaging a hole provided at a position facing the tip of the cap and a spring hook-shaped part, so that the tension acts double as compared with a nut in which the spring is directly attached. You can

2. With the structure of the cap with spring described above, a surplus force is generated in the spring after tightening, making it easier to re-screw and tighten, which is not possible in the past, and it is possible to sufficiently cope with changes over time.

3. The integrated structure with the spring cap makes it easy to operate and easy to manufacture.

[Brief description of drawings]

FIG. 1 is a perspective view for explaining the usage state of the present invention, and FIG. 2 is a developed view. 1, 8 ... Cap, 2, 9 ... Nut 4, 4 ... Locking hole, 7 ... Tightening wood portion 11, 11 ... Hook-shaped portion

Claims (1)

[Scope of utility model registration request] 1. A tightening nut in which a bolt is attached to a tightening wooden part and which is tightened by a nut with a spring interposed therebetween, which is opposed to a washer fitted to the bolt attached to the tightening wooden part. A spring whose free end tip is provided in the shape of a hook and a diamond-shaped flat surface having holes for inserting bolts on the upper and lower surfaces are provided with engaging holes for fixing the hook at the tip of the hook at opposite positions. In addition to the above, a U-shaped hanging wall is formed in the longitudinal direction of the diamond-shaped flat, and the spring hook-shaped part is fixedly integrated with the lower cap and the engaging holes of the upper and lower caps. A cap with a spring that is characterized by setting.