Multiple chambered lift bag
AssigneeEngineered Fabrics Corporation
InventorsHancel R. Wright, Harry T. Metcalfe
Life of this patent
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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.
Claims9
A lift bag for lifting at least one object comprising:
- a plurality of independently and selectively inflatable and deflatable chambers, each said chamber including an inflation fitting and relief fitting and being defined by an upper surface sheet and a lower surface sheet, wherein a portion of each said upper surface sheet of one chamber positioned below an adjacent chamber is securely attached to a portion of said lower surface sheet of said adjacent chamber, each said upper and lower surface sheet comprising a rubberized fabric, and an uppermost portion of said plurality of chambers including a textured pad for gripping the object to be lifted.
Dependencies are inferred from the claim text.