Multiple chambered lift bag
US5506012A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Apr 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24843
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A lift bag includes a plurality of independently inflatable chambers for controlling lifting of objects. Each chamber is defined by an upper surface sheet and a lower surface sheet, the upper surface sheet of one chamber positioned below an adjacent chamber being securely attached to the lower surface sheet of an adjacent chamber. The lift bag can be operated at pressures of about 15 psig at specified heights which allows greater flexibility compared to conventional, single-chambered lift bag which operate at pressures of about 7 psig. Preferably, all seams, reinforcements, and fittings are vulcanized in place using uncured rubber coated fabric. Grommets or other securing means may provide further stability to the lift bag.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.