Motors: expansible chamber type – Independently operated timer – delay – pattern or cyclic control – Of independently movable working members
Patent
1975-11-17
1978-06-06
Schwadron, Martin P.
Motors: expansible chamber type
Independently operated timer, delay, pattern or cyclic control
Of independently movable working members
91 39, 91470, 104 12, 13762413, 13762523, 1362547, F15B 2102
Patent
active
040929035
ABSTRACT:
Opposed pivotally mounted tamper arms are oscillated by respective single-acting hyraulic piston assemblies controlled by separate hydraulic duplex rotary distributing valves. Fluid supply and return lines for each piston assembly are connected to a source of pressurized hydraulic fluid via the respective rotary valve. Each valve has a stationary ported shell which receives a rotary cylindrical spool having a pair of axially displaced supply and return throughports which alternately register with supply and return line ports in the shell to open and close the connections between the respective piston assembly and the supply and return lines. While the rotary valves are preferably driven by a common drive unit, the relative phase of the oscillations of the arms can be determined by rotationally offsetting one of the spools with respect to the other by the desired phase angle.
REFERENCES:
patent: 225749 (1880-03-01), Eberman
patent: 1006228 (1911-10-01), Kirkus
patent: 2830563 (1958-04-01), Burckhalter
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patent: 3135223 (1964-06-01), Plasser
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patent: 3430653 (1969-03-01), Brimhall
patent: 3810417 (1974-05-01), Sieke
patent: 3885883 (1975-05-01), Sieke
patent: 3995530 (1976-12-01), Gunn
Graystone Corporation
Hershkovitz Abraham
Schwadron Martin P.
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