US3632241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding system
Assignee: UNIROYAL PLASTICS COMPANY Inc WORLD HEADQUARTERS MIDDLEBURY CT 06749 A CORP OF
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Filing: 1969-03-18
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Granted: 1972-01-04
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Expires: 1989-03-18
Abstract
Abstract Low-density foam objects are made from a material so highly frothed that it is difficult to pour into a mold. It is therefore delivered to the mold under pressure by means of system having a holding tank with appropriate foam inlet and outlet means, a mechanism for maintaining constant pressure in the tank, a mechanism for preventing overfilling of the tank, and a control which allows air to enter the tank to replace the foam material displaced during filling of the mold. The foam delivery hose has a special nozzle which rapidly couples to and decouples from the mold-filling port. The mold has special provision for preventing leakage of foam between the mold cavity and its top plate.
Inventors
- 👤 Lawrence P Vanderhagen
- 👤 Gerald R Ritter
- 👤 Gilbert C Zion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:29
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A pressurized foam molding system comprising: a mold having a fill port; a line for delivery of fluid to said fill port; a tank adapted to contain liquid foam material, and having a foam outlet connected to said delivery line, means for supplying liquid foam to said tank, and means for supplying gas to said tank; said gas supplying means including a pressure source, and pressure-sensing means connected to sense the pressure in said tank and to control the flow of gas from said pressure source to said tank so as to maintain a substantially constant gas pressure in said tank; said fill port and delivery line being adapted for rapid mating with and rapid disengagement from each other; means pivotally mounted on said mold for rapid covering of said fill port after disengagement of said delivery line therefrom; and releasable clasping means for holding said covering means closed.
Claim 2
Dependent Claim
149 words
A pressurized foam molding system comprising: a mold having a fill port; a line for delivery of fluid to said fill port; a tank adapted to contain liquid foam material, and having a foam outlet connected to said delivery line, means for supplying liquid foam to said tank, and means for supplying gas to said tank; said gas supplying means including a pressure source, and pressure-sensing means connected to sense the pressure in said tank and to control the flow of gas from said pressure source to said tank so as to maintain a substantially constant gas pressure in said tank; said fill port and delivery line being adapted for rapid mating with and rapid disengagement from each other; means pivotally mounted on said mold for rapid covering of said fill port after disengagement of said delivery line therefrom; and releasable clasping means for holding said covering means closed.
Claim 3
Dependent Claim
151 words
A pressurized foam-molding system comprising: a mold having a fill port; a line for delivery of fluid to said fill port; a tank adapted to contain liquid foam material, and having a foam outlet connected to said delivery line, means for supplying liquid foam to said tank, and means for supplying gas to said tank; said gas-supplying means including a pressure source, and pressure-sensing means connected to sense the pressure in said tank and to control the flow of gas from said pressure source to said tank so as to maintain a substantially constant gas pressure in said tank; said fill port and delivery line being adapted for rapid mating with and rapid disengagement from each other; said fill port being bounded by an internal conically tapered surface; and said delivery line terminating in a bulbous nozzle of circular cross section for mating with and disengaging from said conically tapered surface.
Claim 4
Dependent Claim
151 words
A pressurized foam-molding system comprising: a mold having a fill port; a line for delivery of fluid to said fill port; a tank adapted to contain liquid foam material, and having a foam outlet connected to said delivery line, means for supplying liquid foam to said tank, and means for supplying gas to said tank; said gas-supplying means including a pressure source, and pressure-sensing means connected to sense the pressure in said tank and to control the flow of gas from said pressure source to said tank so as to maintain a substantially constant gas pressure in said tank; said fill port and delivery line being adapted for rapid mating with and rapid disengagement from each other; said fill port being bounded by an internal conically tapered surface; and said delivery line terminating in a bulbous nozzle of circular cross section for mating with and disengaging from said conically tapered surface.
Claim 5
Dependent Claim
47 words
A system as in claim 2 further comprising: means pivotally mounted on said mold for rapid covering of said fill port after disengagement of said delivery line therefrom, said covering means being formed with means for mating with said conically tapered surface whereby to close said mold.
Claim 6
Dependent Claim
16 words
A system as in claim 3 wherein: said mating means is an external conically tapered surface.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |