Support structure for mobile folding stage
US4327650A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Jun 13, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60B33/06
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A mobile folding stage having a pair of stage surface members (10, 11), main support legs interconnected to form a base frame (12), and outer support legs (14, 15). Casters (70-73) are connected to caster beams (60-63) which are pivotally mounted to a caster frame (45) secured to the main support legs. Actuator links (86, 87) connect from the caster beams to the stage surface members to cause extension of the casters when the stage is brought to its horizontal, operable position, and to retract the casters when the stage is folded to its storage position. Outer leg control links (120) are positioned with respect to the outer leg to provide an over center resistance force which holds the stage surface members in their folded position. In the preferred embodiment, elevational adjustment is achieved through auxiliary support legs (130, 131), and the caster beams (60, 61) are shaped and positioned, together with stop members (141, 142) to position and secure the auxiliary legs in their fully extended position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.