Self-adjusting pneumatic load elevator
US5299906A · kind A · utility
Inventor
Key dates
| Filing date | May 3, 1991 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | May 3, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66F7/085
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A self-adjusting load elevator has a base, a horizontal load platform, a vertically expandable scissors linkage coupled between the load platform and the base, and an air actuator chamber. The air actuator chamber is formed of a compressible bellows and a fixed volume reservoir. The bellows is compressible between specified maximum and minimum bellows heights which correspondingly determine substantially different maximum and minimum bellows volumes and coupled between the scissors linkage and the load platform. The air reservoir is coupled to the bellows and has a fixed volume that is substantial compared to the difference between the maximum and minimum bellows volumes. A normally closed air inlet/outlet valve is coupled to the air actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.