Device for accelerating the initial stroke of hydraulic jacks

Details Device for accelerating the initial stroke of hydraulic jacks Device for accelerating the initial stroke of hydraulic jacks

1976-07-30

1978-05-16

Maslousky, Paul E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91 29, 91408, F15B 1522

Patent

active

040892514

ABSTRACT:
A device for accelerating the initial stroke of hydraulic jacks, comprising a cylinder, a piston provided with sealing-rings, said cylinder fluid feed-orifices and orifices for exhausting fluid through a plurality of calibrated ports arranged in rows in the cylinder periphery at both ends thereof, characterized in that at least one piston-ring (S.sub.2, S.sub.4) at one end of piston (P) is mounted in its respective groove (R.sub.1) with a certain amount of axial and lateral clearance, said groove communicating with the bottom of the piston through at least one port (B.sub.1).

REFERENCES:
patent: 2060 (1865-08-01), Barrett
patent: 3033169 (1962-05-01), Norwood
patent: 3138066 (1964-06-01), Walker
patent: 3388634 (1968-06-01), Madland
patent: 3592106 (1971-07-01), Baughman
patent: 3626812 (1971-12-01), Trick

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