Mobile folding choral riser with high-speed cylinder lift-assist mechanism and partially independent back railing linkage
US8413384B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 2010 |
| Grant date | Apr 9, 2013 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H3/126
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a mobile folding choral riser having lift-assist and stability mechanisms. In particular, the choral riser includes a gas cylinder that provides a force tending to extend the cylinder to assist in folding the riser into a storage position, the cylinder providing substantially no force to resist rapid extension thereof. In addition, the choral riser preferably includes a back railing linkage that permits independent raising and lowering of a back railing member when the choral riser is in a use or partially folded position but constrains the back railing member to a raised position when the choral riser is in an at least substantially fully folded position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.