Lift truck
US4552250A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1983 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | Apr 22, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66B9/187
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A lift truck having a frame and a two-stage telescopic mast in which an outer, movable mast is mounted to telescope over an inner mast which is fixed to the frame, each mast having a substantially continuous, unitary tubular body which provides superior strength characteristics in response to torsional loads and bending moments. The masts each include vertically extending beams, integral with the tubular bodies thereof, having tracks to receive rollers mounted to the beams so that the only contact between the masts is by the rollers. The beams of the outer mast include tracks which receive the rollers of a platform having a lifting fork structure and which is vertically movable relative to the outer mast.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.