Apertured valve disposed in hollow piston rod of follower-type m

Details Apertured valve disposed in hollow piston rod of follower-type m Apertured valve disposed in hollow piston rod of follower-type m

1988-05-27

1990-03-13

Garrett, Robert E.

Motors: expansible chamber type

Constantly applied motive fluid with controlled venting

Fluid vented through working member

91378, F15B 910

Patent

active

049074920

ABSTRACT:
A piston is moveably arranged in a cylindrical bore of a housing and the piston rod extends through one end of the housing for connection to a unit to be controlled. A very high variable control rate of the piston is made possible by a control slide valve formed as a hollow cylinder that is moveable within a coaxial bore of the piston rod. The hollow, cylindrical, control slide valve contains a plurality of apertures that cooperate with ports formed in the piston rod that extends on either side of the piston. A chamber formed on one side of the piston is connected to a source of pressurized fluid and a chamber at the other side of the piston is connected to a return for such pressurized fluid. A control rod is connected to the control slide valve for moving same within the coaxial bore of the piston rod and by specially forming the guiding or leading edges of the apertures formed in the control slide valve, high variable control rates are possible.

REFERENCES:
patent: 1533767 (1925-04-01), Schmidt
patent: 1732813 (1929-10-01), Kasley
patent: 2738770 (1956-03-01), Granzow
patent: 3015310 (1962-01-01), Faisandier
patent: 3053052 (1962-09-01), Garrison et al.
patent: 3076442 (1963-02-01), Raeber
patent: 3228305 (1966-01-01), Wills
patent: 3757640 (1973-09-01), Karol
patent: 3768369 (1973-10-01), Knutson
patent: 3892164 (1975-07-01), Magor
patent: 3961561 (1976-06-01), Knutson
patent: 4085920 (1978-04-01), Waudoit

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