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US3608055A
Expired / Lapsed
US
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Method of shaping plastic sheet material
Assignee: Continental Can Co Inc
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Filing: 1968-12-09
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Granted: 1971-09-21
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Expires: 1988-12-09
Abstract
Abstract A method of drawing a formable material by vacuum drawing in which a flexible diaphragm is placed below and next to the formable sheet material. A vacuum is applied to the underside of the flexible diaphragm to draw it and the formable sheet into a female die. The formed sheet is then withdrawn from contact with the diaphragm.
Inventors
- 👤 Florren E Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:31
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/28; B29C43/00; B29C43/02; B29C43/10; B29C43/12; Y; Y10; Y10S; Y10S264/00; Y10S264/78; Y10S425/00; Y10S425/044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A method of shaping a distensible plastic sheet material as set forth in claim 1 in which said step of moving comprises the steps of: moving said die away from said sheet in a direction normal to the plane of said sheet a distance sufficient whereby the bottom of said formed sheet clears the top of said female die; and allowing said sheet to lie against said frame.
Claim 2
Dependent Claim
39 words
A method of shaping distensible plastic sheet material as set forth in claim 1 in which said step of moVing comprises: lifting said frame and sheet away from said female die; and separating said sheet from said female die.
Claim 3
Dependent Claim
52 words
A method of shaping a distensible plastic sheet material as set forth in claim 1 comprising the additional step of: moving said sheet laterally to remove said formed segment of said sheet from between said frame and said die to present fresh material so that the series of operations may be repeated.
Claim 4
Dependent Claim
64 words
A method of shaping a distensible plastic sheet material as set forth in claim 1 in which said step of evacuating comprises: applying vacuum to the space between the elastomeric diaphragm and the female die; and varying the degree of vacuum at a rate that draws the distensible plastic sheet into the female die along with the diaphragm without cracking the distensible plastic sheet.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |