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US4155583A
Expired / Lapsed
US
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Vacuum suspension for hoisting plates
Assignee: KOMBINAT BUDOWLANY BYTOM ZAKLAD DOSWIADCZALNY PRAS BET
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Filing: 1977-10-13
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Granted: 1979-05-22
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Expires: 1997-10-13
Abstract
Abstract A vacuum suspension for handling large size plates, especially concrete building parts that are still of low strength and brittle. The suspension is a stiff case forming the carrying structure frame having the vacuum pumps on its top. The inside of the case is divided by a baffle into a work vacuum chamber and decompression chamber. The latter is separated by a holed plate from a foam rubber sheet, having suction cups shaped therein. The holed plate of the suspension has self controlled fluidic disk valves of low inertia.
Inventors
- 👤 Jan Mikos
- 👤 Jan Kowal
- 👤 Albin Loska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:58
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/02; B66C1/0212; B66C1/0218
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A vacuum suspension apparatus for handling large plates especially of concrete, having a low degree of hardening, employing a vacuum pump assembly disposed on a supporting structure, said supporting structure being closed at the bottom by a perforated plate, said plate being bonded with a flexible layer of plastic material in which suction clamping chambers are formed, wherein: said supporting structure is defined by an interior forming a vacuum chamber, said chamber being divided by a baffle into a first part and a second part, said first part being the larger of said parts and defining a work vacuum chamber and the second of said parts being smaller and defining a decompression chamber; the latter having suction channel means coacting with self operating valve means for connecting the decompression chamber with said suction clamping chambers.
Claim 2
Dependent Claim
135 words
A vacuum suspension apparatus for handling large plates especially of concrete, having a low degree of hardening, employing a vacuum pump assembly disposed on a supporting structure, said supporting structure being closed at the bottom by a perforated plate, said plate being bonded with a flexible layer of plastic material in which suction clamping chambers are formed, wherein: said supporting structure is defined by an interior forming a vacuum chamber, said chamber being divided by a baffle into a first part and a second part, said first part being the larger of said parts and defining a work vacuum chamber and the second of said parts being smaller and defining a decompression chamber; the latter having suction channel means coacting with self operating valve means for connecting the decompression chamber with said suction clamping chambers.
Claim 3
Dependent Claim
44 words
A vacuum suspension apparatus for handling plates, as claimed in claim 1, wherein: said decompression chamber has a volume not exceeding 0.2 of the volume of the working vacuum chamber and is approximately equal to the sum of the suction clamping chambers free volume.
Claim 4
Dependent Claim
88 words
A vacuum suspension apparatus for handling plates, as claimed in claim 1, wherein: said suction channel means define guideways for said self operating valve means, said valve means is defined by a body portion of plastic material, terminated at one side by a threaded end part and at a second side being formed with a head, guiding bars being portioned intermediate thereof, and an adjustable stroke stop fastened onto said threaded end of said body portion, and a sealing cap formed of plastic pressed tightly upon said head.
Claim 5
Dependent Claim
17 words
A vacuum suspension apparatus as claimed in claim 3, wherein: said body portion being formed of polypropylene.
Claim 6
Dependent Claim
16 words
A vacuum suspension apparatus as claimed in claim 3, said sealing cap is formed of rubber.
Claim 7
Dependent Claim
18 words
A vacuum suspension apparatus as claimed in claim 1, wherein: said layer of plastic material comprises foam rubber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |