Bucket leveling system with dual fluid supply

Details Bucket leveling system with dual fluid supply Bucket leveling system with dual fluid supply

1988-06-06

1990-05-08

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

91170R, 91520, 414708, E02F 343

Patent

active

049233629

ABSTRACT:
A boom and bucket system for a loader includes a bucket leveling valve which maintains a desired orientation of the bucket as the boom is raised or lowered. A hydraulic circuit automatically and selectively supplies fluid for bucket leveling from boom cylinder return flow, from a pump, or from both in varying proportions.

REFERENCES:
patent: 3251277 (1966-05-01), Stacey
patent: 3563137 (1871-02-01), Graber et al.
patent: 3811587 (1974-05-01), Seaberg
patent: 3987920 (1976-10-01), Parquet et al.
patent: 4375344 (1983-03-01), Baum et al.
patent: 4408518 (1983-10-01), Diel et al.
patent: 4561342 (1985-12-01), Calvert
Cessna, "15 G.P.M. Inline Self-Leveling Valve", date unknown, 7 pages.
Design Engineering, "Electrohydraulics for Remote Control", Jun. 1981, pp. 57-63.

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