JPS6312509Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to, for example, a push button switch that is directly attached to a printed wiring board, and particularly relates to the waterproof structure of its operator.

Nowadays, for example, push button switches that are directly attached to printed circuit boards have a sealed structure that prevents cleaning fluid and water from entering the switch to clean flux and dust after soldering, and also provides a light operating feel. The resulting products are desired.

FIG. 1 shows a conventional push button switch. 11 is a board, 12 is a switch case, and this case 1
2 is provided with a shaft portion 14 provided on an operator 13 so as to be freely movable in and out. An operating section 15 connected to a switch mechanism (not shown) is located at the inner end of the case of the shaft section 14.
A return spring 16 is interposed between the operating portion 15 and the substrate 11. Therefore,
The shaft portion 14 is always connected to the case 12 by the return spring 16.
This protruding position is regulated by the engagement state between the actuating portion 15 and the inner surface of the case 12. Further, a groove portion 17 is provided on the circumferential surface of the intermediate portion of the shaft portion 14, and this groove portion 1
A ring-shaped packing 19 that presses against the inner wall surface of the sleeve 18 of the case 12 is fitted into the sleeve 7 .

According to the above configuration, the packing 19 is always in pressure contact with the inner wall surface of the sleeve 18, so that it has a sealed structure. Therefore, in order to push down the operator 13, it is necessary to generate a force that overcomes the frictional force between the packing 19 and the inner wall surface, and the force of the strong spring 16 that resists this frictional force and returns the operator 13. Therefore, the above-mentioned light operational feeling cannot be expected.

This idea was made based on the above circumstances, and the waterproof structure of the control element provides a light operating feel at all times, and can easily be made into a sealed structure when necessary to obtain sufficient waterproof effect. This is what we are trying to provide.

An embodiment of this invention will be described below with reference to the drawings. Incidentally, the same parts as in FIG. 1 are given the same reference numerals, and the description thereof will be omitted.

In FIGS. 2 and 3, case 1 of the shaft portion 14
A groove 20 is provided around the shaft at the inner end of the shaft 2, and a ring-shaped packing 21 made of an elastic member such as rubber is fitted into the groove 20. The outer surface of the packing 21 protrudes from the outer circumferential surface of the shaft 14 when it is fitted into the groove 20 . On the other hand, the inner surface of the case 12,
Further, a ring-shaped recess 22 is provided around the shaft portion 14 . The diameter of this recess 22 is the same as that of the packing 21.
narrower than the outer diameter of

In the above configuration, in normal use, the outer surface of the packing 21 is in contact with the peripheral edge of the recess 22 as shown in FIG. 2, and in this state, the operator 13 is pressed against the urging force of the spring 16. The switch state is toggled. Note that the biasing force of the spring 16 is such that the packing is not press-fitted into the recess 22. Therefore, with this configuration, the packing does not come into pressure contact with the inner wall surface of the sleeve 18 during normal use as in the conventional case, and the operating element 13
Since the pressing force depends only on the biasing force of the spring 16, the pressing force can be reduced.

Also, during soldering, etc., by strongly pulling out the operator 13 outward from the case 12,
Packing 21 is press-fitted into recess 22 as shown in FIG. Therefore, a sealed structure can be easily obtained, and a sufficient waterproof effect can be obtained when cleaning flux. Furthermore, if the operator 13 is pressed against the frictional force between the packing 21 and the recess 22 in the state shown in FIG. 3, the state shown in FIG. 2 will be achieved.

In addition, although the above explanation was about applying this invention to a push button switch, it is also possible to apply this invention to other electronic devices.

As detailed above, according to this invention, the waterproof structure of the control element provides a light operating feeling at all times, and can easily be made into a sealed structure when necessary, thereby obtaining sufficient waterproof effect. can be provided.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of the conventional waterproof structure of the control element, and Figs. 2 and 3 are side sectional views showing an example of the waterproof structure of the control element according to this invention, each showing a different state. FIG. 12... Case, 13... Operator, 14... Shaft, 16... Return spring, 20... Groove, 21...
Packing, 22... recess.

Claims (1)

[Scope of utility model registration request] A shaft portion of the operator that penetrates the case so as to be freely removable, a groove portion provided on the circumferential surface of the inner end of the case of the shaft portion, and an outer surface portion fitted into the groove portion that protrudes from the circumferential surface of the shaft portion. A ring-shaped elastic member, and a recess provided on the inner surface of the case and around the shaft portion, into which the elastic member is press-fitted with the shaft portion being strongly pulled toward the outside of the case. Waterproof structure of controls.