Switch actuator means of the time delay type

Details Switch actuator means of the time delay type Switch actuator means of the time delay type

1977-10-07

1979-12-11

Scott, James R.

Electricity: circuit makers and breakers

Retarded

Dashpot

H01H 4300

Patent

active

041784910

ABSTRACT:
A switch actuator of the time-delay type is disclosed for operating an electrical switch having an ON-OFF lever, including a mounting plate upon which is secured a cylinder closed at one end and open at the other end to the atmosphere. A piston is slidably disposed within the cylinder and includes a one-way seal member which defines at the closed end of the cylinder a substantially fluid-tight chamber. The piston, which is normally spring-biased toward the open end of the cylinder, is displaceable against the force of the spring toward a first position adjacent the closed end of the cylinder, thereby to force the fluid quickly out of the sealed chamber past the one-way seal. An operating member movably connected with the switch plate pivots the switch lever to the ON position when the piston is in the first position. The seal member is designed to permit controlled leakage of atmospheric fluid back into the chamber, whereby the spring-biased piston is displaced at a predetermined controlled rate toward a second position adjacent the open end of the piston, whereupon the operating member is operated to displace the switch lever toward the OFF position. A decorative cover member is connected with the switch plate by a snap connection to enclose the time delay device.

REFERENCES:
patent: 716406 (1902-12-01), Gibbings
patent: 2035648 (1936-03-01), Frank
patent: 2590840 (1952-04-01), Clayton
patent: 2637788 (1953-05-01), Bracken
patent: 3179758 (1965-04-01), Trock
patent: 3484090 (1969-12-01), Mahoney

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