Bucket leveling mechanism

Details Bucket leveling mechanism Bucket leveling mechanism

1981-07-02

1983-03-01

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

414709, 414700, E02F 300

Patent

active

043753442

ABSTRACT:
A bucket leveling mechanism that automatically operates a tilt cylinder for pivoting the bucket so that the attitude of the bucket remains substantially constant as the bucket lift arms are raised. Two push-pull cable assemblies are provided; one cable assembly senses the rotation of the bucket and the other cable assembly senses the pivotal movement of the lift arms. The cable assembly for the bucket is attached between the bucket and a wedge shaped block that operates a spool control valve for the bucket tilt cylinder. The lift arm cable assembly is attached to a lift arm at one end and includes an opposite roller end that engages one side of the wedge shaped block, with the block being sandwiched between the control valve spool and roller end of the lift arm cable assembly. The wedge shaped block includes a cam surface that is movable between the control valve spool and roller end of the lift arm cable assembly in proportion to the relative movement of the bucket and lift arms. When the lift arms are raised to a predetermined height where the bucket would normally roll back past a level position, the roller end of the lift arm cable assembly acts upon the wedge shaped block to push the cam surface against the control valve spool to thereby automatically actuate the bucket tilt cylinder for rotating the bucket toward a level position. The wedge shaped block also provides a positive stop that prevents the operator from manually overriding the level position of the bucket when the lift arms are fully raised.

REFERENCES:
patent: 3032215 (1962-05-01), French et al.
patent: 3410433 (1968-11-01), Brown
patent: 3695474 (1972-10-01), Blakely

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