Bucket leveling mechanism
US4375344A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1981 |
| Grant date | Mar 1, 1983 |
| Priority date | — |
| Expiry date | Jul 2, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/433
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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 p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.