US3843290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die
Assignee: SENDER ORNAMENTAL IRON WORKS
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Filing: 1972-12-18
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Granted: 1974-10-22
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Expires: 1992-12-18
Abstract
Abstract An extrusion die made up of a barrel with a screw rotatable in it to direct plastic from it with means to rotate the screw. A thermocouple supported in a tube inside the screw, the thermocouple terminating at a position outboard of the screw end, so that the thermocouple senses the temperature of the plastic directly before it leaves the die.
Inventors
- 👤 W Sender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:20
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/84; B29C48/82; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92209; B29C2948/92323; B29C2948/92361; B29C2948/9238; B29C2948/9239; B29C2948/924; B29C48/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
An extrusion die comprising a die barrel having a generally cylindrical bore, said bore having a closed end, an opening in said closed end to discharge plastic from said bore, a hollow screw in said bore having a spiral flute adapted to rotate in close proximity with the wall defining said bore, a tube in said screw, drive means driving said screw for rotation in said barrel, and sensing means connected to the outer end of said tube, anti-friction bearings in said hollow screw supporting said tube concentric thereto, whereby said screw can rotate around said tube, and a temperature sensing wire extending through said tube and terminating adjacent said opening in said die, whereby the temperature of plastic adjacent said discharge opening can be sensed, and heat insulation material between said sensing means and said frusto-conical end.
Claim 2
Dependent Claim
138 words
An extrusion die comprising a die barrel having a generally cylindrical bore, said bore having a closed end, an opening in said closed end to discharge plastic from said bore, a hollow screw in said bore having a spiral flute adapted to rotate in close proximity with the wall defining said bore, a tube in said screw, drive means driving said screw for rotation in said barrel, and sensing means connected to the outer end of said tube, anti-friction bearings in said hollow screw supporting said tube concentric thereto, whereby said screw can rotate around said tube, and a temperature sensing wire extending through said tube and terminating adjacent said opening in said die, whereby the temperature of plastic adjacent said discharge opening can be sensed, and heat insulation material between said sensing means and said frusto-conical end.
Claim 3
Dependent Claim
46 words
The die recited in claim 1 wherein said screw terminates in a tip, said sensing means disposed in said tip fixed to said frusto-conical end, said tip extends outwardly beyond the end of said screw, and said heat insulation material supporting said tip in said screw.
Claim 4
Dependent Claim
30 words
The die recited in claim 1 wherein said screw has a frusto-conical end, and said tip projects a substantial distance beyond said frusto-conical end and terminates adjacent said discharge opening.
Claim 5
Dependent Claim
12 words
The die recited in claim 1 wherein said tube has ventilation openings.
Claim 6
Dependent Claim
45 words
The die recited in claim 2 wherein said tube terminates in a head adjacent said tip, two spaced waterproof rings are supported on said head forming a seal between said head and said screw, and openings are provided in said head between said waterproof rings.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |