Material handling vehicle having improved deadman control
US4336860A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1980 |
| Grant date | Jun 29, 1982 |
| Priority date | — |
| Expiry date | Jan 24, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F9/20
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A material handling vehicle is disclosed which is in the form of a battery-operated lift truck having a drive unit including an electric motor and a brake and having a hydraulically operated power steering system controlled from a steering wheel on a vertically movable platform. A pump of the power steering system is operated by an electric motor which is energized through a deadman switch on the operator's platform. The brake of the drive unit is spring-biased toward an engaged condition and is released by a hydraulic cylinder supplied with fluid from the power steering pump, the brake being released by the hydraulic back pressure of the power steering system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.