Downshifting work vehicle using differential lock switch
US5026335A · kind A · utility
7Cited by
11References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Mar 3, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H59/50
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The differential lock switch for a work vehicle is used to trigger a control system for downshifting the vehicle from second to first. The control system comprises five relays. The first three relays detect if the vehicle is in second; if the vehicle is going forward; and if the differential lock switch is actuated. The fourth relay is used to latch the signal from the third relay so that the differential lock switch can be released and the vehicle will remain in first. The fifth relay receives signals from the first four relays and manipulates the correct solenoid valves for downshifting the vehicle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.