Motors: expansible chamber type – Relatively movable working members with one having motive... – Position of one working member controls motive fluid for...
Patent
1978-08-14
1980-12-30
Maslousky, Paul E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Position of one working member controls motive fluid for...
91193, 91291, 91293, 91400, 91520, F01L 2102, F01L 2506
Patent
active
042416418
ABSTRACT:
A pilot assembly for switching the fluid supply valve of a hydraulic pump is actuated by the pressurized hydraulic fluid which operates the hydraulic pump. The hydraulic pump includes a main cylinder, a main piston within the main cylinder, and a main valve for supplying pressurized hydraulic fluid to the rear end of the main cylinder for driving the piston forwardly. The pilot assembly includes a pilot cylinder and a pilot spool within the cylinder. A first hydraulic conduit connects one end of the pilot cylinder to the front end of the main cylinder, and a second hydraulic conduit connects the other end of the pilot cylinder to the main cylinder at a position spaced rearwardly from the front end of the main cylinder. When the main piston passes forwardly of the second hydraulic conduit, the pressurized hydraulic fluid in the main cylinder moves the pilot spool, and pressurized hydraulic fluid is allowed to flow to the main valve to switch the main valve.
REFERENCES:
patent: 2069122 (1937-01-01), Weaver
patent: 2112466 (1938-03-01), Maloon
patent: 3774696 (1973-11-01), Horsch
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