JPH0439617Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a push button switch that opens and closes an electric circuit by pressing a push button.

[Background technology]

If the cover is removed with the contacts closed, the contact opening/closing means will be exposed, and the number of energized points will increase compared to when the contacts are open, increasing the risk of electric shock. This risk will be reduced if the contacts are always open when the cover is removed.

[Purpose of invention]

The purpose of this invention is to provide a push button switch with improved safety so that the contacts are open when the cover is removed.

[Disclosure of invention]

The push button switch of this invention includes a contact opening/closing means in which a contact is opened and closed by rotating a driver, a push button having an operating shaft for rotating the driver, and a case housing the contact opening/closing means. A cover mounted on the opening of the case, an engaging claw protruding from the lower surface of the cover, and when the contact is in a closed state, the contact is engaged with the engaging claw, and the cover is detached from the case. and an engaging protrusion provided on the driver at a position where the contact is opened by the action of pulling up the engaging claw.

According to this invention, when the contact is in the closed state, the engaging claw protruding from the lower surface of the cover is engaged with the engaging protrusion provided on the driver, and in this state, the cover is detached from the case and the engaging protrusion is engaged with the engaging protrusion provided on the driver. When the pawl is pulled up, the driver is rotated and the contacts are opened.

Embodiment FIG. 1 is an exploded perspective view showing the structure of a push button switch according to an embodiment of this invention. Further, FIG. 2 is a sectional view of the contact in a closed state, and FIG. 3 is a sectional view of the contact in an open state. A body 2 is locked to hook projections 1a and 1b provided at the bottom of the case 1, and terminal screws 3 and 4 are attached to the body 2 to fix terminal washers 5 and 6 and terminal plates 7 and 8. It is screwed on. A shaft 9 is inserted into the insertion holes 2c, 2d of the side plate portions 2a, 2b of the body 2, and a driver 10 is pivotally attached to the shaft 9. A reversing spring 12 is interposed between the lower part of the driver 10 and the movable contact 11 which is pivotally supported on the fulcrum part 7a of the terminal plate 7. These contact opening/closing means are case 1
and an inner cover 15 that is fitted into the opening of the case 1 and fixed with screws 13 and 14. A cover 18 fixed to the case 1 with screws 16 and 17 is disposed above the inner cover 15. At the top of the cover 18,
Insertion holes 15a, 15b of inner cover 15 and cover 1
8 through the insertion holes 18a, 18b, and the drive element 10
The working shaft 19 that comes into contact with the working parts 10a and 10b of
A pair of square push buttons 1 having a and 20a, respectively
9 and 20 are arranged. Each of the action shafts 19
Through holes 19b and 20b are formed in the peripheral walls of a and 20a, respectively, passing through the side walls.
Compression springs 21 and 22 are fitted into b and 20b, respectively. One end 21 of compression springs 21 and 22
a and 22a protrude in the radial direction so that the push buttons 19 and 20 are held by the cover 18, and are in contact with recesses 18c and 18d provided in the lower part of the cover 18. The push buttons 19 and 20 are operated by the operation portion 19c,
The mounting direction is regulated by fitting the side portions of the cover 20c into the recesses 18e and 18f formed in the upper part of the cover 18. Further, the push buttons 19 and 20 are guided in the operation displacement direction by their recesses 18e and 18f. The upper surface 18g of the cover 18 has a square hole 18
h, 18i are covered with a decorative plate 23 through which locking protrusions 23a, 23b are inserted.

As shown in FIG. 2, when the push button 19 with the operation display character "ON" engraved on the upper surface of the operation section 19b is pressed, the action section 10a of the driver 10 is pressed down, and the axis of the reversing spring 12 is curved. Therefore, the movable contact 11 swings in the direction of the terminal plate 8, and the movable contact 11a comes into contact with the fixed contact 8a. In this state, the electrical wiring attached to the terminal plates 7 and 8 is electrically connected.

3, when the push button 20 engraved with the operation indicator characters "OFF" is pressed, the action portion 10b of the driver 10 is pressed down, the reversing spring 12 reverses and bends, the movable contactor 11 swings toward the terminal board 7, and the movable contact 11a separates from the fixed contact 8a. In this state, the push button switch is in the OFF state.

In this embodiment, the cover 18 is provided with an engaging claw 18j projecting perpendicularly from its lower surface, and the driver 10 is provided with an engaging protrusion 10c on its upper portion. The engaging claw 18j is inserted into the insertion hole 15c of the inner cover 15 and is disposed inside the case 1. The engaging claw 18j and the engaging protrusion 10c are arranged so that they are engaged when the contact is in the closed state, as shown in FIG. 2, and are not engaged when the contact is in the open state, as shown in FIG. ing.

When the cover 18 is in the state shown in FIG.
When it is removed, the engaging claw 18j moves upward and the engaging protrusion 10c is pushed up, causing the driver 10 to rotate in the direction of arrow C. The situation is shown in FIG. When the driver 10 is rotated, the movable contact 11a is separated from the fixed contact 8a, and the contact becomes open. Therefore cover 1
When 8 is removed from case 1, the contacts are always open.

[Effect of idea]

According to this idea, even if the contacts are open,
When the cover is removed from the case, the contacts are closed, improving safety.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the structure of an embodiment of this invention, Fig. 2 is a sectional view of an embodiment of this invention with contacts in a closed state, and Fig. 3 is a cross-sectional view of an embodiment of this invention with contacts in an open state. FIG. 4, which is a sectional view of one embodiment, shows the state of the contact when the engaging claw 18j moves upward with the contact in the closed state. 10...driver, 18...cover, 18j...
Engagement claws, 19, 20...push buttons, 19a, 20a...
...Axis of action.

Claims (1)

[Scope of utility model registration request] A contact opening/closing means in which a contact is opened and closed by rotating a driver, a push button having an operating shaft for rotating the driver, a case housing the contact opening/closing means, and a cover placed in an opening of the case. and an engaging claw protruding from the lower surface of the cover, and when the contact is in a closed state, the engaging claw is engaged, the cover is separated from the case, and the engaging claw is pulled up. a push button switch comprising an engaging protrusion provided on the driver at a position where the contact is opened.