Variable priority device for heavy construction equipment

Details Variable priority device for heavy construction equipment Variable priority device for heavy construction equipment

1995-06-30

1997-04-01

Merritt, Karen B.

Material or article handling

Vertically swinging load support

Shovel or fork type

91 31, 91 33, F15B 1308

Patent

active

056159919

ABSTRACT:
A variable priority device for heavy construction equipment for establishing a priority of the boom over the bucket by limiting an amount of fluid passing through a bucket-side parallel fluid line when the boom operates alone and thereby decreasing the amount of fluid supplied to the bucket actuator. The device is installed in the bucket-side parallel fluid line and adapted to be switched between an orifice state and an orifice release state, the priority control valve being initially maintained at the orifice release state by a resilience device while being switched from the orifice release state to the orifice state against a resilience of the resilience device in response to a pilot pressure for moving the spool of a boom-side switching valve communicating with the boom actuator.

REFERENCES:
patent: 3927603 (1975-12-01), Bernhoft
patent: 3977100 (1976-08-01), Boersmo
patent: 4508013 (1985-04-01), Barbagli
patent: 4875337 (1989-10-01), Sugiyama
patent: 5107753 (1992-04-01), Ioku

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