Hydraulic apparatus

Details Hydraulic apparatus Hydraulic apparatus

1981-07-15

1983-10-18

Schwadron, Martin P.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91449, 91DIG2, F15B 1104, F15B 13042

Patent

active

044098871

ABSTRACT:
In a hydraulic apparatus, an operating oil delivered from a fixed delivery hydraulic pump is divided into two parts, one of which is discharged into an oil tank by passing through a serial circuit consisting of a normally open valve and an orifice and the other of which is supplied to a piston-cylinder means by passing through a parallel circuit consisting 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 said orifice.

REFERENCES:
patent: 1524497 (1925-01-01), Astrom et al.
patent: 1964196 (1934-06-01), Cuttat
patent: 3018902 (1962-01-01), Minty
patent: 3125319 (1964-03-01), Arbogast et al.
patent: 3141386 (1964-07-01), Loughridge
patent: 3171331 (1965-03-01), Samuel
patent: 3437012 (1969-04-01), Bjorklund
patent: 3633461 (1972-01-01), Komatsu-shi et al.
patent: 3779017 (1973-12-01), Fujisawa et al.
patent: 4197785 (1980-04-01), Weber
patent: 4218957 (1980-08-01), Underwood

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