Two-stage locking push switch

Details Two-stage locking push switch Two-stage locking push switch

1985-11-18

1987-04-28

Bryant, III, James E.

Electricity: circuit makers and breakers

Electric switch details

Indicators

200153J, 200313, H01H 900, H01H 300

Patent

active

046616675

ABSTRACT:
A heart cam type locking mechanism is provided by which in response to a first push button depressing operation, a moving member is locked at a first position in a casing, the moving member is locked at a second position in response to a second push button depressing operation and the moving member is returned to its initial position in response to a third push button depressing operation. The inside of the push button is divided by a partition plate into first and second optical path spaces. A lamp is disposed in the casing so that it emits light into the first and second optical path spaces. A light shielding plate of a resilient material is disposed in the first optical path space and fixed at one end to the moving member. When the moving member is at the initial and first positions, the light shielding plate does not engage a tapered projection formed on the casing, but when the moving member is at the second position, the light shielding plate moves on the tapered projection, closing the first optical path space. First and second display portions are provided on the push button at positions corresponding to the first and second optical path spaces, respectively. When a hook spring of the heart cam type locking mechanism moves on a blocking projection for providing a physical response to the first depressing operation, a stopper projecting out of the casing prevents the hook spring from moving back to a returning passage, engaging it with a second heart cam.

REFERENCES:
patent: 4254315 (1981-03-01), Stevens
patent: 4395611 (1983-07-01), Kondo et al.
patent: 4454399 (1984-06-01), Suzuki
patent: 4467159 (1984-08-01), Ota et al.

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