Linkage for loader bucket or other material handling device
US5201235A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1992 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Apr 20, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/18944
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to a linkage connectable between a frame and an attachment. The linkage is characterized as self-leveling, meaning that once an attitude or orientation of the attachment with respect to the ground is achieved, the linkage will maintain that attitude as the attachment is raised or lowered without additional operator input. A preferred linkage connectable between the frame of a loader vehicle and a loader bucket includes an arm pivotally connectable between the frame and bucket, a hydraulic lift cylinder pivotally connectable between the frame and arm for raising and lowering the arm and resultantly the bucket, an equalizer link pivotally connectable to the arm at the same location as the lift cylinder, a hydraulic tilt cylinder pivotally connectable between the bucket and one end portion of the equalizer link, and an equalizer bar pivotally connectable between the frame and the other end portion of the equalizer link. If the tilt cylinder is held stiff as the bucket is raised or lowered, the parallelogram action of the frame, lift arm, equalizer link and equalizer bar will be imparted to the parallelogram of the tilt cylinder, bucket, lift arm and e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.