Stabilizing apparatus incorporating telescopic structures
US4084777A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 19, 1977 |
| Grant date | Apr 18, 1978 |
| Priority date | — |
| Expiry date | Jan 19, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/80
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Stabilization apparatus for a tower crane or other mobile equipment includes several telescopic structures. Each structure includes an inner telescopic part and an outer telescopic part and an actuator for moving the parts to a fully extended position. The inner telescopic part carries a plate which is applied in use to the ground and is controlled by a secondary telescopic structure. When the main telescopic structure is extended there is some sag so that a detector intended to indicate achievement of the extended position is not actuated. When the secondary telescopic structure is actuated and the plate is in firm contact with the ground the sag is corrected and the detector is actuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.