JPS5914827Y2 - Dust-proof structure of push button - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dustproof structure for an external operation push button that is removably inserted into a device housing.

For example, when a preset counter or the like is used in a device such as a spinning machine where the surrounding area is filled with dust such as fluff, it is necessary to take measures such as accommodating the counter body in a dust-proof casing.

This is because if dust enters and adheres to the movable part of the counter, it may cause a failure and its operational reliability cannot be guaranteed.

An example of this will be briefly explained using FIG. 1. In the figure, reference numerals 1 and 2 are front and rear casings that are divided into two parts, which are connected by screws. Contains a preset counter mechanism.

Reference numeral 3 denotes a dustproof cover attached to the opening of the front casing 1 via a hinge 4 so that it can be opened and closed freely.
The casings 1 and 2 are made of a transparent plate so that the displayed values can be seen through, and have a completely sealed structure to prevent dust from entering the casings 1 and 2.

By the way, the problem with such a dust-proof preset counter is that this kind of preset counter mechanism is equipped with a push button for zero return operation, and this is connected to the front and rear casings 1, 2 and 2 described above. It is necessary to be able to operate the device from the outside of the device housing consisting of the dustproof cover 3.

In the preset counter shown in FIG. 1, a through-hole 6 is formed in a part of the front surface 3a of the dust-proof cover 3 (see FIG. 2), and a head 7a for operation is inserted into the through-hole 6 and a head 7a is integrated therein. A push button 7 consisting of a rod portion 7b fixed to the housing is slidably provided, and the push button 7 exposed outside the housing allows a zero return push button (
(indicated by reference numeral 8 in FIG. 2) can be pressed.

In the figure, reference numeral 9 denotes a guide protrusion that is integrally formed around the through hole 6 on the front surface 3a of the dustproof cover 3, and this guides the rod part 7b of the push button 7 so that it can be freely inserted into and removed from the dustproof cover 3. has been done.

Therefore, in the above-mentioned preset counter that requires the push button 7 exposed outside the casing, dust may enter the casing through the gap in the through hole 6 that slidably supports the rod portion 7b, causing a malfunction on the equipment side. This also causes problems such as the through hole 6 becoming clogged and hindering the sliding movement of the push button 7.

For this reason, the second type of dustproof structure for this type of push button has traditionally been used.
As shown in the figure, a bag-shaped cap 10 made of a flexible member is placed over the push button 7 outside the housing, and its open end is fixed to the guide protrusion 9 provided on the front surface 3a of the dustproof cover 3. Therefore, it is known that the push button 7 and the through hole 6 that slidably supports the push button 7 are covered, but in this case, the cap 10 that is simply placed over the push button 7 is fixed to the housing side. The disadvantage is that the structure is complicated.

That is, in such a conventional structure, a two-layer flange 10 protruding inwardly from the opening of the cap 10 is provided.
b, and between these flanges 10a and 10b S, G
The annular bushing 11 is fitted and fixed in the groove thus formed, and a small diameter part 8a is formed in a step shape at the upper part of the guide protrusion 9 on the housing side, and the bush 1 is inserted into this small diameter part 9a.
The cap 10 was fixed to the housing side by fitting and fixing the cap 10.

Therefore, in such a structure, the shapes of the cap 10 and the mounting part on the housing side are complicated, and the manufacturing cost thereof is not only high, but also parts such as the bushing 11 for fixing the cap 10 are required. Installation is also troublesome.

Furthermore, since the cap 10 is configured to cover the entire push button 7, it is impossible to confirm whether the push button has properly recovered during operation.To solve this problem, the cap must be made of a transparent material. This is not desirable in terms of cost.

Furthermore, in the cap 10 described above, there is a push button 7 that can be used.
The height of the push button is limited, and if the height of the push button differs depending on the purpose of the counter, caps with different heights must be prepared each time, and there is also a drawback that there is no versatility.

In view of the above-mentioned circumstances, the present invention uses a flexible sleeve member having a simple shape with both ends open, one end of which is attached to a small diameter cylindrical part formed on the base end side of the push button head, and the other end The present invention provides an inexpensive dustproof structure for a push button that can reliably prevent dust from entering the through hole in the housing that supports the push button in a slidable manner by having a simple structure in which the push button extends to the outer surface of the equipment housing. be.

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

FIGS. 3 and 4 show an embodiment of a dustproof structure for a push button according to the present invention, and in this embodiment, a case will be described in which the structure is applied to a push button for external operation in the preset counter shown in FIG. 1.

Now, according to the present invention, the dustproof cover 3 on the equipment housing side
A small-diameter cylindrical portion 7C is formed in a stepped manner at the rod-side end of the head 7a of the push button 7, which is slidably supported in a through-hole 6 formed in the front surface 3a of the push button 7. Intrusion of dust into the through hole 6 is prevented by using a flexible sleeve member 20 having openings at both ends covering the guide protrusion 9 protruding from the outer surface of the housing.

That is, the flexible sleeve member 20 is formed with a small diameter portion 20a having an opening formed with an inner diameter corresponding to the small diameter cylindrical portion 7C of the push button 7, and an inner diameter corresponding to the guide protrusion 9 on the housing side. The large diameter portion 20b has a stepped opening.

As shown in FIG. 3, this sleeve member 20 has its large diameter portion 20b covered from the head 7a side of the push button 7, and
Further, by expanding the small diameter portion 20a and attaching its opening to the small diameter cylindrical portion 7C, and on the other hand, attaching the opening of the large diameter portion 20b at the other end to the outer periphery of the guide protrusion 9 on the housing side. It will be installed.

This state is shown in FIG.

With this configuration, the gap between the rod portion 7b of the push button 7 and the through hole 6 is completely sealed by the sleeve member 20, and no inconvenience such as clogging due to intrusion of dust occurs.

As for its structure, it is only necessary to form a small-diameter cylindrical portion 7C in a stepped manner on the head of the push button 7, and the shape of the guide protrusion 9 on the housing side can be simplified, and there is no need for a special bushing as in the conventional case. There are advantages that the shape of the sleeve member 20 is simple.

Further, since the head 7a of the push button 7 is exposed to the outside, operability is excellent, and furthermore, the small diameter portion 20 of the sleeve member 20
It is also excellent in terms of versatility, as it can sufficiently handle cases where the height of the push button differs depending on the model by providing a margin in the length of H in the axial direction.

In the above-mentioned embodiment, the flexible sleeve member 20 has a stepped structure consisting of a small diameter part 20a and a large diameter part 20b corresponding to the small diameter cylindrical part 7C on the push button 7 side and the guide protrusion 9 on the housing side. Although the present invention is not limited to this, the guide protrusion on the housing side may be formed into a simple cylindrical shape with a small diameter. You can.

In this case, in order to improve the operability of the push button, the outer periphery of the sleeve member may be formed into a bellows shape.

Further, in the above-described embodiment, the present invention was applied to a push button for external operation in a dust-proof preset counter, but the present invention is not limited to this, and the present invention is not limited to this. If so, it is applicable.

As explained above, according to the dustproof structure of the push button according to the present invention, the push button head is provided with a small diameter cylindrical part, one end of the flexible sleeve member with both ends open is attached to this, and the other end is attached to the small diameter cylindrical part. Because it extends toward the housing, the structure is simple, and each part can be manufactured and assembled easily.
It is excellent in terms of versatility, and can also reliably prevent dust from entering the through hole on the housing side into which the push button is inserted.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall configuration of a dust-proof preset counter equipped with a push button for external operation, Fig. 2 is a partially omitted cross-sectional view showing the dust-proof structure of a conventional push button, and Fig. 3 is a perspective view showing the structure of a dust-proof preset counter equipped with a push button for external operation. FIG. 4 is an exploded perspective view showing one embodiment of the dustproof structure of such a push button, and is also a side sectional view. 1.2...Casing, 3...Dustproof cover, 6...
・Through hole, 7...Push button, 7a...Head, 7b...
Rod part, 7C... Small diameter cylindrical part, 9... Guide projection part, 20... Flexible sleeve member, 20 a... Small diameter part, 20 b... Large diameter part.

Claims (1)

[Scope of utility model registration request] In a push button that consists of a head for operation and a rod part integrally attached to the head, and is provided in a device housing so as to be freely inserted and removed, a small diameter cylindrical part is formed at the end of the head on the rod part side. Further, one end of a flexible sleeve member having open ends at both ends is closely fitted over the cylindrical portion, and the other end is extended to the outer surface of the equipment casing from which the rod portion protrudes. Push-button dustproof structure.