Hydraulic apparatus

Details Hydraulic apparatus Hydraulic apparatus

1979-06-06

1982-03-09

Cohen, Irwin C.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91443, 91446, 91448, 91452, F15B 1108, F15B 13042

Patent

active

043183328

ABSTRACT:
In a hydraulic apparatus, operating oil delivered from a fixed delivery hydraulic pump is divided into two parts, one end of which is discharged into an oil tank by passing through a serial circuit of a normally open valve and an orifice and the other end of which is supplied to a piston-cylinder mechanism by passing through a parallel circuit of a normally closed valve and a check valve. When the normally closed valve is closed and the normally open valve is gradually closed, the piston is raised while gradually increasing in velocity. On the other hand, when the normally open valve is totally opened to stop the piston and the normally closed valve is gradually opened, the piston is lowered while gradually increasing in velocity. When the valves are operated to cause the piston to move vertically, the impact applied thereto at the time when the valve opening is large is largely mitigated by using the orifice.

REFERENCES:
patent: 1524497 (1925-01-01), Astrom et al.
patent: 1964196 (1934-06-01), Cuttat
patent: 3018902 (1962-01-01), Minty
patent: 3141386 (1964-07-01), Loughridge
patent: 3779017 (1973-12-01), Fujisawa et al.

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