Seismic safety cutoff switch

Details Seismic safety cutoff switch Seismic safety cutoff switch

1978-08-25

1980-03-04

Scott, James R.

Electricity: circuit makers and breakers

Special application

Actuated concurrently with operation or use of art device

H01H 3514

Patent

active

041918681

ABSTRACT:
A seismic safety cutoff device responsive to external forces such as earthquakes, for use with an electrical switch for controlling the flow of electricity, including a housing adaptable to a switch mechanism having a spring-biased control stem, the safety cutoff device also having a substantially vertically-mounted rod which is pivotable near its upper end to permit movement in any horizontal direction of a weight at its lower end for releasing the spring-biased stem upon it's deflection by an external force. A stem-positioning member is connected to the control stem and extends outward through the housing for easy visual inspection and for ease of re-setting the device after being tripped by an external force.

REFERENCES:
patent: 941033 (1909-11-01), Pardee
patent: 1901554 (1933-03-01), De Wilde
patent: 2158753 (1939-05-01), Hansen
patent: 2254294 (1941-09-01), Kimmell
patent: 2255965 (1941-09-01), Brandon
patent: 2783321 (1957-02-01), Richardson
patent: 3022392 (1962-02-01), Clemson
patent: 3602660 (1971-08-01), Eslinger
patent: 3703617 (1972-11-01), Burnett
patent: 3745277 (1973-07-01), Shawcross et al.
patent: 3927689 (1975-12-01), Sharp
patent: 4000408 (1976-12-01), McCartney

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