Anti-rollback mechanism for a loader mechanism of an off-highway

Details Anti-rollback mechanism for a loader mechanism of an off-highway Anti-rollback mechanism for a loader mechanism of an off-highway

1994-01-21

1996-03-26

Bucci, David A.

Material or article handling

Vertically swinging load support

Shovel or fork type

414709, 74471XY, B66C 2300

Patent

active

055015700

ABSTRACT:
An anti-rollback mechanism is provided for an off-highway implement having a mobile frame and a loader mechanism including a bucket pivotally attached between lift arms of the loader mechanism. The lift arms are connected to the frame of the implement and lift actuators are used to angularly move the lift arms to elevationally position the bucket. Tilt actuators connected to the bucket and to the lift arms effect rolling movements of the bucket relative to the lift arms. A single handled control mechanism regulates operation of the tilt and lift actuators through hydraulic tilt and lift valves. The anti-rollback mechanism of the present invention automatically positions the tilt valve as the lift arms move through a predetermined range of angular movements relative to the frame to prevent rollback of the bucket past a generally level position as the lift arms and bucket are elevated.

REFERENCES:
patent: 3402840 (1968-04-01), Goth
patent: 3521781 (1970-07-01), Holsinger et al.
patent: 3522897 (1970-08-01), Freedy
patent: 3539068 (1970-11-01), Seaberg
patent: 3568869 (1971-03-01), Beiley
patent: 3794199 (1974-02-01), Bromberek
patent: 4018352 (1977-04-01), Lindstrom
patent: 4372729 (1983-02-01), Buschbom et al.
patent: 4375344 (1983-03-01), Baum et al.
patent: 4431364 (1984-02-01), Redenbarger et al.
patent: 4452559 (1984-06-01), Speers et al.
patent: 4966518 (1990-10-01), Kourogi et al.

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