US3868204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for curing elongate workpieces
Assignee: G Siempelkamp GmbH and Co KG
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Filing: 1974-02-14
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Granted: 1975-02-25
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Expires: 1994-02-14
Abstract
Abstract A web of unvulcanized rubber or other curable material is passed back and forth through two or more superposed stages of a multiplaten press while being led around a deflection roller between successive stages. The stack of press platens is flanked by a pair of clamps, each with as many jaws as there are platens, which simultaneously grip the several passes of the web in the open state of the press and are then moved apart to stretch the intervening web sections just before the press closes on them.
Inventors
- 👤 Hendrikus-Johannes Bongers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:29
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/10; B29K; B29K2021/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
203 words
An apparatus for curing a web of polymeric material, comprising: a press with a stack of heated platens, including a top platen, a bottom platen and at least one intermediate platen forming a plurality of superposed curing stages between them; stationary deflecting means positioned alongside said stack between the levels of successive stages for engagement by a web led in several passes through said stages; a pair of clamps movably disposed at opposite sides of said stack, each clamp being provided with a top jaw, a bottom jaw and at least one intermediate jaw substantially aligned with said platens for bracketing the passes of said web entering and leaving said stages; intermittently operable actuating means for closing first said jaws and thereafter said platens on the interposed passes of said web; mechanism synchronized with said actuating means for moving said clamps apart in a position of closure of said jaws but prior to closure of said platens with consequent stretching of said passes preparatorily to application of heat and pressure to sections of the stretched web for curing same; and feed means operative upon a reopening of said jaws and said platens to advance said web for positioning previously uncured sections between platens.
Claim 2
Independent Claim
203 words
An apparatus for curing a web of polymeric material, comprising: a press with a stack of heated platens, including a top platen, a bottom platen and at least one intermediate platen forming a plurality of superposed curing stages between them; stationary deflecting means positioned alongside said stack between the levels of successive stages for engagement by a web led in several passes through said stages; a pair of clamps movably disposed at opposite sides of said stack, each clamp being provided with a top jaw, a bottom jaw and at least one intermediate jaw substantially aligned with said platens for bracketing the passes of said web entering and leaving said stages; intermittently operable actuating means for closing first said jaws and thereafter said platens on the interposed passes of said web; mechanism synchronized with said actuating means for moving said clamps apart in a position of closure of said jaws but prior to closure of said platens with consequent stretching of said passes preparatorily to application of heat and pressure to sections of the stretched web for curing same; and feed means operative upon a reopening of said jaws and said platens to advance said web for positioning previously uncured sections between platens.
Claim 3
Dependent Claim
36 words
An apparatus as defined in claim 1, further comprising lateral extensions on said top and bottom platens engaged by said clamps for guiding same toward and away from said press under the control of said mechanism.
Claim 4
Dependent Claim
22 words
An apparatus as defined in claim 2 wherein said actuating means comprises fluid-operated jack means movable with said clamps along said extensions.
Claim 5
Dependent Claim
43 words
An apparatus as defined in claim 3 wherein said extensions are engaged by said jack means for imparting closing and opening motions concurrently to said jaws and said platens, said jaws being resiliently biased against said jack means to close before said platens.
Claim 6
Dependent Claim
38 words
An apparatus as defined in claim 1 wherein said stack and said clamps are provided with centering means maintaining said intermediate jaw and platen separated from said top and bottom jaws and platens in the open position thereof.
Claim 7
Dependent Claim
80 words
An apparatus as defined in claim 5 wherein said centering means comprises a first pair of articulated levers pivoted to said top and bottom platens, a first link extending from one of the levers of said first pair of said intermediate platen, a second pair of articulated levers pivoted to said top and bottom jaws of each clamp, and a second link extending from one of the levers of said second pair to the intermediate jaw of the respective clamp.
Claim 8
Dependent Claim
26 words
An apparatus as defined in claim 6 wherein said first link is spring-loaded for giving said intermediate platen mobility relative to said top and bottom platens.
Claim 9
Dependent Claim
40 words
An apparatus as defined in claim 1, wherein said deflecting means comprises a roller separated from stack by a distance equal to a whole number times half the width of said platens in the direction of advance of said web.
References Cited (Backward Citations)
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US2867845A
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US2884032A
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Cited
US3600746A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |