Portable riser apparatus having a lifting and locking assembly
US7814708B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2009 |
| Grant date | Oct 19, 2010 |
| Priority date | — |
| Expiry date | May 12, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H3/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
There is provided a portable riser having an operator actuated lifting assist assembly operatively coupled to a riser deck. In one aspect, there is a first pivot mechanism coupled to a first support leg and adapted to initiate upward movement of the portable riser from a collapsed position when a downward force is applied to the first support leg, and a second pivot mechanism coupled to a second support leg and adapted to continue the upward movement. The lifting assist assembly provides a lifting force that continues upward movement to an upright position where the portable riser in locked. There is included a riser unlocking means for unlocking the lifting assist assembly. The portable riser remains in the upright position until the riser unlocking means is operated and a collapsing force is applied to the portable riser sufficient to overcome the lifting force and enable collapsed of the portable riser.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.