Position responsive valve for controlling the retraction rate of

Details Position responsive valve for controlling the retraction rate of Position responsive valve for controlling the retraction rate of

1977-02-16

1979-04-03

Purser, Ernest R.

Static structures (e.g., buildings)

Mechanism operated relatively movable shaft assembly

Fluid pressure actuated

52119, 182 2, 137 38, 212 39A, E04H 1234

Patent

active

041469984

ABSTRACT:
In an articulated boom having a platform and comprised of upper and lower booms respectively, there are hydraulic actuators controlling the movements of the upper and lower booms. Control means are necessary in association with the lower boom to control its rate of movement, slowing such rate of movement as the lower boom approaches its retracted, or full rest, position. A position responsive valve permits unimpeded fluid pressure access to the actuator for lowering the lower boom at its regular rate until the lower boom reaches a critical angle as it approaches horizontal position, at which time the valve prevents further fluid access to its associated hydraulic actuator. Thereafter, a position responsive valve and a pressure reducing valve reduce the rate of descent of the lower boom until the lower boom is fully retracted to its rest position.
The described hydraulic control is in a single package which can be retrofitted into existing hydraulic systems and is independent of the pilot operated check valve and cylinder, being located between the main control valve and the power cylinder and does not interfere with existing hydraulic controls.

REFERENCES:
patent: 2182463 (1939-12-01), Beeston
patent: 3371800 (1968-03-01), Grove
patent: 3415021 (1968-12-01), Myers
patent: 3670849 (1972-06-01), Milmer
patent: 4037742 (1977-07-01), Gustafsson

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