Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1993-03-29
1995-05-09
Underwood, Donald W.
Material or article handling
Vertically swinging load support
Shovel or fork type
60422, 91516, E02F 300
Patent
active
054134528
ABSTRACT:
A hydraulic system suited for use with a backhoe apparatus and which is configured to automatically direct a priority flow of actuating fluid from an actuating fluid source to hydraulic motors used to swing the backhoe apparatus into a desired swing position independently of other backhoe operations and the corresponding loads thereof. The hydraulic system of the present invention includes a priority valve which is connected to the fluid source and has priority and secondary hydraulic circuitry extending therefrom. The priority valve is positioned under the influence of fluid pressure differentials applied against it. In response to operator desires to swing the backhoe apparatus from one position to another, the priority valve automatically directs a dedicated flow of actuating fluid through the priority circuit to the swing motors used to swing the backhoe apparatus into the desired swing position. The flow to the swing motors is independent of other backhoe functions concurrently operated therewith thereby allowing a substantially constant swing speed for the backhoe apparatus. When the backhoe apparatus is held in a static position, the priority valve automatically directs actuating fluid from the fluid source through the secondary circuit to other hydraulic motors in the hydraulic system.
REFERENCES:
patent: 3927603 (1975-12-01), Bernhoft
patent: 3994133 (1976-11-01), Pfeil et al.
patent: 4007845 (1977-02-01), Worback
patent: 4193734 (1980-03-01), Williams
patent: 4556078 (1985-12-01), Wittren
patent: 4757685 (1988-07-01), Burckhartzmeyer
patent: 4836087 (1989-06-01), Nakagomi
Lech Richard J.
Pieper Patrick J.
Case Corporation
Underwood Donald W.
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