US3695804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet molding apparatus including means for removing molded articles from the sheet material
Assignee: Monsanto Co
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Filing: 1970-03-25
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Granted: 1972-10-03
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Expires: 1990-03-25
Abstract
Abstract Articles formed from sheet material in a trim in place thermoforming operation are separated from the remainder of the sheet and rapidly removed from the place of separation by a method which involves angularly directing a jet of high velocity gas at the article as the sheet with the article partially separated therefrom is passing over a stripping surface. The apparatus includes a conduit immediately adjacent the stripping surface with a series of angularly oriented openings formed therein for passage of the gas therethrough.
Inventors
- 👤 Lee R Layman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:42
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/44; B29C51/445
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
In apparatus for forming an article from a portion of a heated sheet of thermoplastic which includes a mold having a cavity conforming to the shape of the article, means for forcing the heated sheet portion against the cavity surface, a cutting element surrounding said mold for penetrating the sheet around the periphery of the article to partially separate the article from the sheet, a stripping roll adjacent said mold, and means for advancing the sheet with the partially separated article attached therein across a portion of the surface of said stripping roll to release the article from the sheet, the improvement which comprises a conduit located downstream from and adjacent the surface of said stripping roll having a plurality of openings therein oriented for directing pressurized gas against said article as it leaves said stripping roll to assist in separating said article from the sheet and a substantially planar oriented constraining member extending downstream of said conduit to force said separated article to travel away from said stripping roll under the influence of said pressurized gas.
Claim 2
Dependent Claim
177 words
In apparatus for forming an article from a portion of a heated sheet of thermoplastic which includes a mold having a cavity conforming to the shape of the article, means for forcing the heated sheet portion against the cavity surface, a cutting element surrounding said mold for penetrating the sheet around the periphery of the article to partially separate the article from the sheet, a stripping roll adjacent said mold, and means for advancing the sheet with the partially separated article attached therein across a portion of the surface of said stripping roll to release the article from the sheet, the improvement which comprises a conduit located downstream from and adjacent the surface of said stripping roll having a plurality of openings therein oriented for directing pressurized gas against said article as it leaves said stripping roll to assist in separating said article from the sheet and a substantially planar oriented constraining member extending downstream of said conduit to force said separated article to travel away from said stripping roll under the influence of said pressurized gas.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein the holes in the conduit are oriented at an angle of between 15* to 70* with respect to the horizontal.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein the constraining member is oriented in a substantially horizontal direction.
References Cited (Backward Citations)
US2121721A
Cited
US2744286A
Cited
US2974364A
Cited
US3162077A
Cited
US3240851A
Cited
US3190946A
Cited
FR1336085A
Cited
US3381068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |