Electricity: circuit makers and breakers – Special application – Change of inclination or of rate of motion responsive
Patent
1978-01-11
1979-07-31
Scott, James R.
Electricity: circuit makers and breakers
Special application
Change of inclination or of rate of motion responsive
200302, H01H 3500
Patent
active
041631277
ABSTRACT:
An arc free electrical switch assembly for use in highly combustible environments which includes a hollow chamber defined by integrally formed bottom, side and end walls in which is disposed a switch mounting bracket having a pair of mercury switches mounted thereon with their respective contacts connected in a series string and so oriented that when the housing is in a predetermined orientation, both of said switches are electrically closed, but when the housing is rotated with respect to a working surface in a first direction or a second opposite direction, one or the other of said pair of switches open to break the series string. A cover plate and a sealed conductor lead-in are also included as a part of the housing such that grain dust or other combustible substances present cannot be exposed to an electrical spark or arc in the event that the assembly is inadvertently connected to a higher than normal voltage source. The switch assembly is readily adapted for use as a jam detector for a conveyor belt system.
REFERENCES:
patent: 2116075 (1938-05-01), Lenhart
patent: 2713159 (1955-07-01), Morrison
patent: 3228019 (1966-01-01), Visceglia
patent: 3236989 (1966-02-01), Zavertnik et al.
patent: 3869588 (1975-03-01), Ubukata et al.
patent: 3941956 (1976-03-01), Delin et al.
Haugen Orrin M.
J. H. Electric Co., Inc.
Nikolai Thomas J.
Scott James R.
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