Crane boom extending, retracting and cooperative latching arrangement
US4327533A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Aug 13, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C23/708
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
To reduce the weight and increase the lifting capacity of a multi-section telescopic crane boom, a single hydraulic cylinder for the full extension and retraction of individual boom sections is anchored in the relatively stationary boom base section. A sled structure surrounding the single cylinder and moving therewith has guided engagement through plates fixed to the movable boom sections at or near their rear ends. Driving finger mechanisms on opposite sides of the sled are biased toward driving engagement with the plates of the movable boom sections and are retractable into chambers of the sled. A cooperative locking pin operating assembly for the movable boom sections is fixed on the forward end of the boom base section and includes power retracting devices which operate mating retracting cranks and locking pin sets individual to the movable boom sections when the retracting cranks are aligned beneath the power retracting devices. The movable boom sections are equipped near their outer and inner ends with locking receivers for said locking pins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.