Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1975-11-05
1978-02-14
Scott, James R.
Electricity: circuit makers and breakers
Electric switch details
Contact
200 52R, 200239, 200244, 200237, H01H 112, H01H 900
Patent
active
040741125
ABSTRACT:
A pneumatic cylinder-piston door operator is connected to an air supply by a solenoid actuated valve. A control circuit selectively energizes the solenoid valve in response to momentary actuation of switches including control and safety switches. For refrigeration unit installation, the switch contacts are formed with one contact having a pimpled surface and the other contact having a serrated surface to provide a reliably electrical connection. For the manual control switches, a micro-switch is mounted in a suitable enclosure with appropriate gaskets to minimize the effect of adverse environmental conditions. A spring-loaded plunger is mounted within the housing and provided with an external push-button or pull cord actuator.
REFERENCES:
patent: 1892008 (1932-12-01), Ross
patent: 2490020 (1949-12-01), Enzler
patent: 2788420 (1957-04-01), Mathews et al.
patent: 3168165 (1965-02-01), Bagnusco
patent: 3297851 (1967-01-01), Jaquet
patent: 3531799 (1970-09-01), Rendler
patent: 3842221 (1974-10-01), Dayet et al.
patent: 3922814 (1975-12-01), Runft
Kelley Co., Inc.
Scott James R.
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