JPH053934Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention allows the hole drilled in the instrument case to be inserted into the instrument case when the cord connected to the instrument body, etc. is inserted into the inside and outside of the instrument case. This relates to a hole-clogging structure.

[Conventional technology]

Conventionally, there is a hole-blocking structure as disclosed in Utility Model Application No. 58-5384 and shown in FIG. A hole 2 is bored, and a groove-shaped recess 4 for accommodating the cord 3 connected to the instrument body is cut out in the peripheral edge of the through hole 2, and the recess 4 is fittable into the through hole 2. A sealing cap 6 made of a material such as synthetic resin is formed with a flange 5 that covers the periphery.

[Problem that the invention attempts to solve]

In the hole-closing structure, when the cord 3 connected to the instrument body (not shown) is pulled out from the inside of the instrument case 1, the diameter of the circular through-hole 2 is at least as large as the terminal 7 attached to the cord 3. As the distance between the through hole 2 and the terminal 7 becomes larger, the through hole 2
Since the outer diameter of the flange 5 of the cap 6 that is fitted into the cap 6 becomes large, there is a problem in that the area in which other parts and necessary protrusions and holes are installed in the instrument case 1 is reduced.

Furthermore, as disclosed in Japanese Utility Model Application Publication No. 57-170017, for example, if the shape of the through hole 2 is made into a rectangular shape that is approximately the same shape as the terminal, the size of the hole may be smaller than that of a circular shape. Directionality is required when inserting the cap 6, which has the same shape as the hole.
This had the problem of reducing workability.

Furthermore, since both of the conventional examples described above have a structure in which a sealed state is formed by bringing the outer circumferential surface of the cap 6 into surface contact with the inner circumferential surface of the through hole 2, a shape error between the through hole 2 and the cap 6 may be caused. When the fitting pressure is weak, it is easy to fall off, and when the fitting pressure is strong, it becomes difficult to insert, which causes problems such as the fitting condition becoming uncertain and the assembly work being difficult.

[Purpose of invention]

This idea was devised by focusing on the problems of the conventional case, and it reduces the area of the through-hole in the case compared to the conventional case, which has a circular shape, and improves the workability of fitting the cap into the through-hole. With,
The present invention provides a hole-closing structure that can provide a good fitting condition.

[Summary of the idea]

In order to achieve the above object, this invention includes a polygonal through-hole drilled in the case, a recess connected to the through-hole and housing a polygonal cord with a terminal that is routed inside and outside the case; A circular or substantially circular cap that partially contacts and fits into the polygonal side portion of the through hole, and covers the entire portion between the cap and the through hole and a portion or all of the recess. The cap has a peripheral flange provided on the cap, and the through hole has a shape similar to the shape of the terminal.

〔Example〕

FIGS. 1 and 2 show one embodiment of this invention, and the same or corresponding parts as in FIG. 5 are given the same reference numerals, and detailed explanation thereof will be omitted.

A cord 3 connected to an instrument body (not shown) housed in an instrument case 1 is inserted through a polygonal through hole 2 drilled in approximately the same shape as a terminal 7 attached to the cord 3 to connect the instrument to the instrument case 1. As the cord 3 is pulled out from the inside of the case 1 to the outside, the cord 3 fills the space between it and the groove-shaped recess 4 with its own elasticity.

On the other hand, a circular cap 6 made of an elastic material such as rubber, polypropylene, acrylic, polyethylene, etc. is provided with a periphery 5, and the cap 6 partially contacts the polygonal side portion of the through hole 2 at a contact point P. The instrument case is fitted into the instrument case while being in contact with the instrument case, and the circumferential flange 5 covers the entire portion S between the cap 6 and the through hole 2 that is not in contact with it, as well as a part or all of the recess 4 that accommodates the cord 3. This prevents dust, etc. from entering into the interior of 1.

Note that a cap 6 is provided at the peripheral edge of the through hole 2.
In order to increase the friction area and improve the stability of the cap 6 while maintaining partial contact with the
A substantially semicircular notch 8 may be provided in surface contact with a portion of the periphery of the cap 6. (See Figure 3).

Further, it is also possible to fit into the through hole 2 a cap 6 made of a material with large elastic deformation, which bends into a shape corresponding to the through hole 2, widens the contact point P, increases the friction area, and improves stability. It is possible (see Figure 4).

[Other Examples]

In the above embodiment, the terminal 7 has a rectangular shape, but even if the terminal 7 has a rectangular shape, even if it is a triangular, pentagonal or other polygonal shape, the through-hole 2 can be formed in a shape corresponding to the shape. The area can be minimized, and accordingly, the outer diameter of the cap 6 can be smaller than that of the conventional cap.

[Effect of idea]

This invention consists of a polygonal through hole drilled in the case, a recess connected to the through hole and housing a polygonal cord with a terminal that is routed inside and outside the case, and a polygonal shape of the through hole. a circular or substantially circular cap that partially contacts and fits into the side portion of the cap, and is provided on the cap so as to cover the entire portion between the cap and the through hole and a part or all of the recess. By having a peripheral flange and having the shape of the through hole similar to the shape of the terminal, the cap can be fitted into a polygonal hole such as a square without making the through hole larger than necessary. Since there is no need to worry about the direction in which the cap is attached, work efficiency is improved. Furthermore, since the cap can be fitted into the through-hole while being in partial contact with the through-hole, the cap and the through-hole are more closely connected to each other than in the conventional case where the entire circumference of the cap is closely fitted to the inner circumferential surface of the through-hole. Even if there is a dimensional error, the cap can be fitted into the through hole while being elastically deformed using the gap between the two.
The fitting operation becomes easier, and by bringing the cap into partial contact, the elastic locking force can be increased. In addition, when the cap is inserted into the through hole, the rim covers the space between the two, which improves the workability of assembling the cap, and prevents deterioration of dustproof performance, making it extremely practical. It can provide a highly valuable hole-blocking structure.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the main parts of a meter to which an embodiment of this invention is applied, Fig. 2 is a plan view of the same instrument as seen from the inside of the instrument case, and Figs. 3 and 4 are respectively of this invention. FIG. 5 is a plan view of a meter according to another embodiment as seen from inside the meter case, and FIG. 5 is an exploded perspective view of the main part of the conventional meter. 1...Instrument case (case), 2...Through hole,
3... Cord, 4... Concave groove, 5... Surrounding tsuba, 6...
...Cap, 7...Terminal, 8...Notch, P...
Contact point, S...〓 part.

Claims (1)

[Scope of utility model registration request] A polygonal through hole drilled in the case, a recess connected to the through hole and housing a polygonal cord with a terminal to be routed inside and outside the case, and a polygonal side portion of the through hole. A circular or substantially circular cap that partially contacts and fits into the cap, and a periphery provided on the cap so as to cover the entire portion between the cap and the through hole and a portion or all of the recess. 1. A hole-blocking structure, wherein the through-hole has a shape similar to that of the terminal.