US3743340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum lifting device
Assignee: GIS AG
•
Filing: 1972-01-24
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Granted: 1973-07-03
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Expires: 1992-01-24
Abstract
Abstract A vacuum lifting device comprising a bellows suspended at its upper end and equipped with a load holding mechanism at its lower end. The upper end of the bellows can be connected through the agency of valve means with a vacuum pump.
Inventors
- 👤 F Williamann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0212; B66C1/0231; B66C1/0293
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A negative pressure lifting apparatus comprising a bellows for load handling suspended at its upper end, a suction box at the lower end of said bellows for holding the load, an upper end wall of the bellows, first valve means in said end wall for directly connecting the bellows with the negative pressure pump to raise the load, a lower end wall of the bellows, second valve means in said lower end wall for establishing direct connection of the negative pressure of said bellows with the suction box to attach the load, third valve means in said upper end wall for the direct connection of the bellows with the surrounding air to lower the load, and fourth valve means in said lower end wall for the direct connection of the suction box with the surrounding air to release the load, whereby said suction box is operated directly from the accumulated negative pressure in said bellows, and the negative pressure in said bellows and said suction box may be released independently.
Claim 2
Dependent Claim
170 words
A negative pressure lifting apparatus comprising a bellows for load handling suspended at its upper end, a suction box at the lower end of said bellows for holding the load, an upper end wall of the bellows, first valve means in said end wall for directly connecting the bellows with the negative pressure pump to raise the load, a lower end wall of the bellows, second valve means in said lower end wall for establishing direct connection of the negative pressure of said bellows with the suction box to attach the load, third valve means in said upper end wall for the direct connection of the bellows with the surrounding air to lower the load, and fourth valve means in said lower end wall for the direct connection of the suction box with the surrounding air to release the load, whereby said suction box is operated directly from the accumulated negative pressure in said bellows, and the negative pressure in said bellows and said suction box may be released independently.
Claim 3
Dependent Claim
28 words
The negative pressure lifting device as defined in claim 1, wherein control means are provided in order to alternately open and close the first and third valve means.
Claim 4
Dependent Claim
26 words
The negative pressure lifting device according to claim 1 wherein control means are provided in order to alternately open and close the second and fourth valve.
Claim 5
Dependent Claim
22 words
The negative pressure-lifting device according to claim 3 wherein additional control means are provided for simultaneously closing the second and fourth valves.
Claim 6
Dependent Claim
30 words
The negative pressure-lifting device according to claim 1 wherein a relatively low pressure blower serves as the negative pressure pump and is connected to the upper end of the bellows.
Claim 7
Dependent Claim
20 words
The negative pressure lifting device according to claim 1 wherein control means are provided for simultaneously closing all four valves.
References Cited (Backward Citations)
US2557260A
Cited
US3318468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |