In-line hydraulic dashpot

Details In-line hydraulic dashpot In-line hydraulic dashpot

1991-03-25

1992-10-06

Look, Edward K.

Motors: expansible chamber type

Working member position responsive motive fluid control

Working member controls relatively movable inlet valve

91448, 91462, 91355, 91277, F15B 1304

Patent

active

051522110

ABSTRACT:
An in-line hydraulic dashpot is disclosed that effectively decelerates the iston of a power cylinder by controllably choking off the oil which is providing pressure to the piston. The in-line hydraulic dashpot of the invention includes a valve spool member movable between an open and closed position along a fluid flow path that supplies oil to the power cylinder. An actuator rod is cooperative with the valve spool member and the piston shaft of the power cylinder to move the valve spool member between its open and closed positions. The in-line hydraulic dashpot eliminates the clashing of mechanical parts and therewith eliminates the noise that would otherwise be generated thereby. The in-line hydraulic dashpot of the present invention makes possible the adaptation of a fixed stroke power cylinder to applications that call for a variable stroke length.

REFERENCES:
patent: 114506 (1871-05-01), Knowles
patent: 235318 (1880-12-01), Vaile
patent: 2699150 (1955-01-01), Ziskal
patent: 2743704 (1956-05-01), Banker
patent: 2944522 (1960-07-01), Doyle
patent: 3581759 (1971-06-01), Veale

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