Three point linkage
US4146246A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1977 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Jun 30, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B59/004
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A three point linkage for coupling a tractor or similar vehicle to a working tool includes two lower guide members and an upper guide member which is resiliently connected to the lower guide members. A catch hook is located at one end of each of the guide members for coupling to the working tool. The other end of each of the guide members is coupled to the tractor. The upper guide member is longitudinally adjustable and includes an inner guide element telescopically cooperating with a spring loaded outer guide element. A nut, carrying pivotally movable locking jaws, is slidably carried on the outer guide element for fixing the outer guide element relative to the inner guide element. The catch hook of the upper guide member is carried at the opposite end of the outer guide element from the nut. A locking slide is axially displaceable on the outer guide element for locking a coupling bolt on the working machine within the catch hook and also for displacing the sliding nut in response to its contact with the working tool. The locking slide has a first slot and the outer guide element is provided with a lug which has a second slot positioned at an angle with respect to the first slot. …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.