Motors: expansible chamber type – With correlated control of motive fluid and locking means – Sequential operation of locking means and motive fluid control
Patent
1982-07-20
1984-11-13
Garrett, Robert E.
Motors: expansible chamber type
With correlated control of motive fluid and locking means
Sequential operation of locking means and motive fluid control
91 45, 92 17, 92 21MR, 92 24, 92 32, 92 33, 188 8234, 188 828, 188 822, F15B 1526
Patent
active
044818645
ABSTRACT:
A double-acting hydraulic jack, comprising a hollow piston reciprocable in a surrounding cylinder, includes a tubular shaft extending axially inside and carrying a nut of the circulating-ball type which coacts with a screw coaxially disposed in that shaft. The screw is rigid with the piston whereby an axial displacement of the latter is translated into a rotation of the shaft; a toothed wheel on the shaft, engaged by a spring-loaded detent, acts as a one-way brake enabling such rotation only in one direction and blocking it in the opposite direction unless the detent is withdrawn by a hydraulic servomotor which is pressurized concurrently with the admission of fluid to the cylinder tending to displace the piston in the normally blocked direction. In the case of a double-acting jack, two oppositely effective one-way brakes--possibly including a single toothed wheel on the tubular shaft--normally prevent a displacement in either direction but are respectively deactivated by the admission of fluid into the cylinder at one or the other end thereof.
REFERENCES:
patent: 1740692 (1979-12-01), Hall
patent: 2688227 (1954-09-01), Geyer
patent: 2898888 (1959-08-01), Geyer
patent: 2955579 (1960-10-01), Block
patent: 3104593 (1963-09-01), Clifton et al.
patent: 3603212 (1971-09-01), Geyer
patent: 3955658 (1976-05-01), Bustmante
patent: 4256355 (1981-03-01), Yamaguchi et al.
Garrett Robert E.
Meyer Richard S.
Ross Karl F.
Selenia - Industrie Elettroniche Associate - S.p.A.
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