Semi-dump truck level indicator
US4145682A · kind A · utility
15Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1976 |
| Grant date | Mar 20, 1979 |
| Priority date | — |
| Expiry date | Feb 4, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60P1/045
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A semi-dump level indicator comprising an electrical system including a pair of mercury switches mounted on the rear portion of the trailer. The switches are closed when the trailer is level. When the trailer is dangerously tilted gravity causes one of the switches to open which de-energizes a relay closing a warning light and alarm buzzer circuit in parallel with the circuit having the mercury switches to warn the operator not to raise the trailer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.