Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1982-08-26
1984-06-12
Scott, J. R.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200 82C, H01H 3538
Patent
active
044543930
ABSTRACT:
An electrohydraulic switching device adapted to supply electric control signals in dependence on pressure signals received includes a first piston adapted to be acted upon by the input pressure and spring-loaded in opposition to the input pressure, and a second piston positively engaged with the first piston to activate an electric switching element. The first and second pistons are axially slidable relative to each other by a predetermined distance. A retaining element engages the second piston to provide for a switch hysteresis. To avoid an impact on the limit values as a result of fluid temperature and viscosity variations, the second piston is carried in the retaining element by several circumferentially spaced contact points in that the retention element is an elastic, substantially annular body with open ends. A third piston operative for actuating a second switching element connected to a warning device surrounds the second piston and can be entrained by the latter for movement therewith away from the second switching element against the force of an additional spring.
REFERENCES:
patent: 2292546 (1942-08-01), Rockwell
patent: 2759061 (1956-08-01), Edelman
patent: 3175061 (1965-03-01), Roberts et al.
patent: 3275769 (1966-09-01), Weaver
patent: 3405244 (1968-10-01), Collins
patent: 3614352 (1971-10-01), Wiese
patent: 3746810 (1973-07-01), Parsons et al.
patent: 4256933 (1981-03-01), Choe
Schutt Bernd
Volkmar Werner
IT&T Industries, Inc.
Michals William J.
Raden James B.
Scott J. R.
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