Proportional force amplifier

Details Proportional force amplifier Proportional force amplifier

1971-11-08

1976-06-08

Cohen, Irwin C.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

91416, 91417R, 91431, F15B 910, F15B 1517

Patent

active

039615618

ABSTRACT:
A proportional force amplifier having a cylinder separated by a piston assembly into a pressure chamber, a control chamber and a reservoir chamber, a spool valve mounted for axial movement within a bore in said piston assembly to selectively connect the control chamber to either the pressure chamber or the reservoir chamber, the piston assembly moving in response to the change in pressure between the pressure chamber and the control chamber a distance equal to the distance of movement of the spool valve, the spool valve being connected for actuation by a resilient compensating rod and being pressure balanced.

REFERENCES:
patent: 773365 (1904-10-01), Atkins
patent: 1533767 (1925-04-01), Schmidt
patent: 1950474 (1934-03-01), Brown
patent: 2007423 (1935-07-01), Davis
patent: 2349804 (1944-05-01), Sorensen
patent: 2602437 (1952-07-01), Tancred
patent: 2651316 (1953-09-01), Fageol
patent: 2681043 (1954-06-01), Irwin
patent: 2979080 (1961-04-01), Hewitt
patent: 3017750 (1962-01-01), Kempson
patent: 3099940 (1963-08-01), Leduc
patent: 3145624 (1964-08-01), Parks et al.
patent: 3148592 (1964-09-01), Schultz et al.
patent: 3390612 (1968-07-01), Wills
patent: 3465645 (1969-09-01), Mala

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