Mower with release safety device
US4970848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1990 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Feb 7, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01D75/185
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mower includes a first chassis attachable to a tractor for movement in a work direction, a second chassis having first and second structures connected at a joint extending perpendicular to the work direction, and connecting rods, each having respective ends pivotally connected to the first chassis and to the second structure of the second chassis so as to form with the first and second chassis an upwardly deformable quadrilateral deformable such that the work elements may move to adapt to ground contours. A release safety device normally prevents pivoting of the first structure about the joint but permits pivoting of the first structure about the joint axis when the first structure or the working elements hooks an obstacle during movement of the mower in the work direction. This limits forces applied to the mower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.