Variable centerline sight
US5146686A · kind A · utility
Inventor
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B69/001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A centerline sight apparatus includes a housing mounted on the forward end of a tractor with a sight arm operably mounted in the housing for transverse movement with respect to the longitudinal axis of the tractor. A second sight arm is operably mounted below the first sight arm and moves parallel to the first sight arm at a speed approximately twice as fast and in the same direction as the first sight arm. Both sight arms are connected to a motor which is responsive to movement of a pendulum, so as to move the sight arms in one direction of the other. The pendulum is mounted to sense the lateral cant of the tractor with respect to the tractor's longitudinal axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.