JPS6342168Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bolt having a threaded portion of a desired shape, and more particularly to a bolt whose tightening length and compression amount can be regulated.

Conventionally, when you want to equalize the tightening length of a bolt, or when you want to tighten it with the optimum torque required for packing, etc. that is interposed between a bolt and another member tightened by the bolt, in the former case, screws are used. Adjust the tightening length by providing a threadless part with a larger diameter than the threaded part at the top of the part,
In the latter case, a torque wrench or the like that requires a delicate turning torque is used to secure the desired tightening torque. However, the former type of bolt provided with a non-threaded portion is not flexible in size and shape, so its usage is limited and it is disadvantageous in terms of weight. Furthermore, the latter method using a torque wrench is inconvenient for continuous and rapid tightening work, and has poor workability and is hardly practical.

In order to eliminate such drawbacks, a device was devised in which a spacer 1 having an appropriate thickness as shown in Fig. 1 was attached to the bolt A, and the tightening dimensions and tightening torque were determined by the thickness of the spacer 1. However, if the specified tightening dimensions are long, there will be a significant increase in weight, and if the packing 2 is attached and tightened, the compression area of the packing 2 will be narrowed and the sealing force will be reduced. It could not have been a strategy.

The present invention eliminates many of these drawbacks and provides a bolt that has an extremely simple and lightweight structure, accurately controls tightening dimensions and torque, and greatly improves work efficiency.

The present invention is a bolt A having a threaded portion 3, as shown in FIG. In this structure, one or more C-shaped rings 5, which are formed by cutting out a part of a circle and are made of metal or synthetic resin having sufficient strength, are engaged with the annular groove 4.

There is no need to be particularly particular about the relationship between the annular groove 4 and the C-shaped ring 5, as long as they fit and engage with each other, the effects described below will be fully achieved.
It is more preferable if the C-shaped ring 5 has a wire diameter larger than the thread pitch of the bolt A and has a spring effect acting toward the center, since the C-shaped ring 5 can be easily attached to the bolt A and the engagement effect is large. .

A bolt having such a structure will be described in detail with reference to the embodiment shown in FIG. An engageable C-shaped ring 5 is engaged with the groove 4. For example, a packing 2 is attached to this bolt A with a C-shaped ring 5, and this is attached to a tightening member 6 having a hole 7 having a diameter larger than the outer diameter of the threaded portion 3 of the bolt A but smaller than the outer diameter of the C-shaped ring 5. Through the tightening member 6
Threaded portion 3 of bolt A is attached to the main body member located below the
Screw them together and rotate to tighten. In this state of being tightened, the packing 2 first comes into contact with the surface of the tightening member 6 and is compressed and deformed, and then the annular groove 4
The C-shaped ring 5 engaged with contacts. At this time, since the outer diameter of the C-shaped ring 5 is larger than the diameter of the hole 7 of the tightening member 6, it is caught on the surface of the tightening member 6, and the packing 2 cannot be tightened any further. serves to tighten the tightening member 6. Therefore, the packing 2 attached to the bolt A
The optimal amount of compression is ensured for the complete wall, and excellent sealing effects can be achieved. The meaning of being able to mechanically obtain the desired compression dimension B in this way is that it enables quick and easy continuous tightening work without the need for any adjustment device, achieving extremely high efficiency. It is.

In addition, in FIG. 2 and FIG. 3, the present invention was explained using a headed bolt having a head on the upper part of bolt A.
The same effect as described above can be expected with any bolt that has a threaded portion 3. For example, when using the present invention on a headless bolt, the bolt is attached to the annular groove 4 provided in the bolt and the annular groove 4. The shape of the bolt is not limited as long as it can be screwed into the threaded portion 3 of the bolt, such that the C-shaped ring 5 can accurately stop a screw member such as a nut screwed into the bolt at a desired dimension.

In addition, if the desired specified dimensions are required at multiple locations, multiple fastenings can be easily achieved by simply providing multiple sets of the annular groove 4 and C-shaped ring 5 at the desired dimensions, and conversely, determining the dimensions is not necessary. C-shaped ring 5
It has a high degree of flexibility as it can be used as the original bolt by removing it.

As explained above, the present invention is an ideal bolt with a sizing tightening mechanism that uses an extremely simple and inexpensive annular object to mechanically easily control the tightening length and tightening torque of the compressed material.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional bolt. FIG. 2 is a perspective view and a cross-sectional view of a bolt with a fixed size tightening mechanism according to the present invention. FIG. 3 is a sectional view showing an embodiment of the bolt of the present invention. A... Bolt, B... Desired compression dimension, 1... Spacer, 2... Packing, 3... Threaded part, 4
... annular groove, 5 ... C-shaped ring, 6 ... tightening member,
7...hole.

Claims (1)

[Scope of utility model registration request] In a packing sizing tightening bolt having a threaded part; the bolt has one or more annular grooves extending in the circumferential direction by dividing the threaded part at an arbitrary point, and the annular grooves are formed of metal, synthetic resin, etc. A bolt with a sizing tightening mechanism, which is characterized by engaging one or more C-shaped rings with a part of a circle cut out.