Introduced in the hydraulic actuation for the alternative moveme

Details Introduced in the hydraulic actuation for the alternative moveme Introduced in the hydraulic actuation for the alternative moveme

1981-10-30

1984-03-06

Maslousky, Paul E.

Motors: expansible chamber type

Constantly applied motive fluid with controlled venting

Cyclically operable

91210, 91307, 91309, F01L 2506

Patent

active

044347057

ABSTRACT:
A reciprocable drive mechanism has a fluid pressure operable ram controlled by a spool valve, a two-position valve and a braking valve. During a powered stroke of the ram, the spool valve closes an exhaust path of the two-position valve so that the latter remains in a first position in which pressure fluid is obliged to flow through the braking valve, in a fully opened condition, to the cylinder of the ram. At the end of the powered stroke the spool valve is shifted to a second position in which it permits exhausting of fluid through the two-position valve, and as a result of change of differential pressure in the latter, the pressure fluid previously obliged to flow through the braking valve is permitted to flow to exhaust. The braking valve is then less open, so the ram carries out its return stroke at a slower rate.

REFERENCES:
patent: 2477359 (1949-07-01), Barksdale
patent: 2729941 (1956-01-01), Rose et al.
patent: 2914036 (1959-11-01), Johnson
patent: 3971213 (1976-07-01), Kelly

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