Agricultural drawbar and self-locking bushing therefor
US5232056A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1991 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Nov 21, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S411/957
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A drawbar assembly includes a self-locking bushing which is supported from the drawbar mounting bracket by a conventional nut and bolt fastener. Each end of the bushing includes radial line projections which bite into the mounting bracket and into a washer interposed between the nut and the bushing when the nut is threaded onto the bolt. By capturing both bushing ends, the bushing cannot rotate to loosen the nut or wear against the mounting bracket and washer. The bushing is formed as a single component with the radial line projections by a powdered metal process and hardened to provide wear resistance. Dissimilar metals in the bushing and the drawbar at the pivotal connection reduce wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.