Seat belt interlock for loaders
US4844196A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Jul 14, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60R2022/4891
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A loader having hydraulically operated boom and bucket mechanisms controllable from the operator seat is disclosed wherein switches sense the presence of the operator in the seat and the buckling of the seat belt. An electronic controller is operably associated with the seat and belt switches and solenoid valves in the hydraulic system and the starter relay. The controller requires proper sequencing of the activation of the seat and belt switches before permitting the starter to be energized, thereby controlling the starting of the loader engine, or permitting the energizing of the hydraulic solenoid valves to control the flow of hydraulic fluid to the hydraulic cylinders for the boom and bucket. The controller also includes a delay associated with the seat switch so that a reactivation of the seat switch within the delayed period of time would allow the hydraulic system to operate without requiring a resequencing of the activation of the seat and belt switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.