Multiple chambered lift bag

Details Multiple chambered lift bag Multiple chambered lift bag

1994-04-01

1996-04-09

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Nonself-supporting tubular film or bag

428 355, 428 361, 428 368, 428 72, 428141, 428167, 428180, 428192, 428200, 383 3, 254 93HP, 92 90, 92 91, 92 92, 5615, 5932, B66F 324

Patent

active

055060129

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.

REFERENCES:
patent: 3744756 (1973-07-01), Smith
patent: 4016315 (1977-04-01), Szabo
patent: 4275869 (1981-06-01), Clements
patent: 4688760 (1987-08-01), Garman et al.
patent: 4804565 (1989-02-01), Rast
patent: 5082712 (1992-01-01), Starp
patent: 5234740 (1993-08-01), Reeves et al.

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