Method and apparatus for lifting a work implement attached to a work machine
AssigneeCaterpillar Inc.
InventorsAndrew G. Shull, Everett G. Brandt, Robert J. Mcgee
Life of this patent
Estimating the term…
Abstract
A method and apparatus for lifting a work implement attached to a work machine. The method and apparatus includes delivering a lift command to a hydraulic lift circuit, diverting a portion of the lift command to a hydraulic tilt circuit, and responsively tilting the work implement to a rack-back position in cooperation with lifting the work implement.
Claims25
A method for lifting a hydraulically controlled work implement attached to a work machine, including the steps of:
- delivering a lift command to a hydraulic lift circuit;
- diverting a portion of the lift command to a hydraulic tilt circuit;
- and
- responsively tilting the work implement to a rack-back position in cooperation with lifting the work implement.
A method for lifting a hydraulically controlled bucket attached to a loading machine, including the steps of:
- delivering an operator controlled lift command to a hydraulic lift circuit;
- diverting a portion of hydraulic control from the hydraulic lift circuit to a hydraulic tilt circuit;
- and
- responsively tilting the bucket to a rack-back position as the bucket is lifted.
An apparatus for lifting a hydraulically controlled work implement attached to a work machine, comprising:
- an operator controlled lever for delivering a lift command;
- a hydraulic lift circuit for receiving the lift command and responsively lifting the work implement;
- a hydraulic tilt circuit;
- and
- means for receiving a portion of hydraulic control from the hydraulic lift circuit and responsively delivering the portion to the hydraulic tilt circuit for tilting the work implement to a rack-back position in cooperation with lifting the work implement.
An apparatus for lifting an electro-hydraulically controlled bucket attached to a loading machine, comprising:
- an operator controlled lever for delivering a lift command;
- a hydraulic lift circuit for receiving the lift command and responsively lifting the bucket;
- a hydraulic tilt circuit;
- and
- a divertor for receiving a portion of hydraulic control from the hydraulic lift circuit and responsively delivering the portion to the hydraulic tilt circuit for tilting the bucket to a rack-back position as the bucket is lifted.
Dependencies are inferred from the claim text.