Portable performance platform with rain exclusion means and hydraulic actuator
US5546709A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Aug 1, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04H3/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved portable platform for the performing arts for providing a generally covered performing stage and being shiftable from a stowed configuration to a performing configuration wherein an upper and a lower roof assembly from a canopy over the stage having a rain exclusion means for preventing the passage of rain through the canopy and for preventing the entry of rain into the platform when in the stowed configuration. The portable platform includes hydraulic actuation means having at least two hydraulic loops, the first of such loops including a hydraulic ram, the ram extending and supporting the roof assembly, the two hydraulic loops being connected by an interrupter adapted to hydraulically isolate the two loops, thereby hydraulically locking the ram to support the roof assembly in the event of a loss of hydraulic pressure in the second hydraulic loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.