Patent US3602543A successfully refreshed from Google Patents.
US3602543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement in suction cup for vacuum lifting
Assignee: MUNCK INTERNATIONAL
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Filing: 1968-12-18
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Granted: 1971-08-31
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Expires: 1988-12-18
Abstract
Abstract An apparatus for vacuum lifting cargo having a surface with a hole therethrough. Within a suction cup is a plate which overlies the hole, and, when the suction cup is applied to the cargo, the end plate causes a valve stem associated therewith to open a valve to a vacuum source. The plate has a check design of ribs forming a large number of open bottom chambers and a conduit leading from each chamber to the suction cup carrier. The conduits are of such a size that they permit suction of those chambers closed by the said end of the cargo and prevent large quantities of air from flowing through those conduits in communication with the cargo hole.
Inventors
- 👤 Einar Sjodin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:06
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0237; B66C1/025; B25; B25J; B25J15/00; B25J15/06; B25J15/0616; B25J15/0625; B25J15/0641; B66C1/0212; B66C1/0231
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
178 words
An apparatus for vacuum lifting cargo having a hole therethrough comprising a suction cup provided with a valve having a valve stem, a plate connected to said valve stem, said plate overlying the hole in the cargo and being located within the area bounded by the suction cup, the said plate opening said valve when said suction cup is applied against the cargo, said plate being provided at the side facing the cargo with ribs of elastic material forming a check design comprising a relatively large number of chambers between the said plate and the cargo when applied against the cargo, a fine conduit providing communication between each said chamber and the interior of said suction cup the cross-sectional area of each said conduit being sufficiently large that enough air can be withdrawn from those chambers facing a surface of the cargo to create a suction in said chambers, but at the same time small enough to prevent the flow therethrough of substantial quantities of air through said chambers in communication with the said hole in the cargo.
Claim 2
Independent Claim
178 words
An apparatus for vacuum lifting cargo having a hole therethrough comprising a suction cup provided with a valve having a valve stem, a plate connected to said valve stem, said plate overlying the hole in the cargo and being located within the area bounded by the suction cup, the said plate opening said valve when said suction cup is applied against the cargo, said plate being provided at the side facing the cargo with ribs of elastic material forming a check design comprising a relatively large number of chambers between the said plate and the cargo when applied against the cargo, a fine conduit providing communication between each said chamber and the interior of said suction cup the cross-sectional area of each said conduit being sufficiently large that enough air can be withdrawn from those chambers facing a surface of the cargo to create a suction in said chambers, but at the same time small enough to prevent the flow therethrough of substantial quantities of air through said chambers in communication with the said hole in the cargo.
Claim 3
Dependent Claim
64 words
The apparatus according to claim 1, in combination with a cargo having a circular end surface with a hole passing therethrough, wherein the plate has a radius of (K+ D- d)/ 2, wherein K is the diameter of the said cargo holE, D is the diameter of the circular end surface of the cargo and d is the outer diameter of the suction cup.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |