US3813200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jam prevention unit for extrusion process apparatus
Assignee: Philip Morris USA Inc
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Filing: 1973-01-22
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Granted: 1974-05-28
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Expires: 1993-01-22
Abstract
Abstract A device which can be used to prevent a jam of the sizing aperture in the cooling chamber of extrusion process apparatus is disclosed. The device includes a cutter blade which, when an outsized extrudate that would cause a jam of the sizing aperture is detected, operates to sever the extrudate entering the cooling chamber from that already present therein to prevent the outsized extrudate being drawn into the sizing apparatus or being pushed into the same by the extruder pressure. The device also functions to close off the aperture to prevent loss of the liquid coolant in the event of a jam.
Inventors
- 👤 A Gergely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:16
CPC Classifications
B; B26; B26D; B26D3/00; B26D3/16; B29; B29C; B29C48/00; B29C48/03; B29C48/06; B29C48/09; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/911; B29C48/919; B29C48/92; B29C48/96; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92114; B29C2948/92304; B29C2948/92323; B29C2948/92361; B29C2948/92409; B29C2948/92428; B29C2948/92447; B29C2948/92504; B29C2948/928; B29C2948/92819; B29C2948/9298
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
In apparatus for forming a continuous thermoplastic workpiece including means for extruding a continuous workpiece of thermoplastic material as an extrudate of predetermined dimension and heated to a temperature at which it can be plastically deformed, means defining a chamber, a bath of liquid coolant in said chamber, means for advancing said heated extrudate through a shapeing aperture in said chamber disposed below the level of coolant in said bath and into said bath for cooling said extrudate, detection means for detecting any outsized variation in dimension of said extrudate from said predetermined dimension beyond a certain allowable limit as it makes entry to said aperture, and means operable responsive to operation of said detection means for severing said extrudate at a location adjacent said aperture to prevent entry therethrough of outsized extrudate, said last-mentioned means operating concurrently to cover said aperture to prevent outflow of coolant from said bath through said aperture.
Claim 2
Dependent Claim
153 words
In apparatus for forming a continuous thermoplastic workpiece including means for extruding a continuous workpiece of thermoplastic material as an extrudate of predetermined dimension and heated to a temperature at which it can be plastically deformed, means defining a chamber, a bath of liquid coolant in said chamber, means for advancing said heated extrudate through a shapeing aperture in said chamber disposed below the level of coolant in said bath and into said bath for cooling said extrudate, detection means for detecting any outsized variation in dimension of said extrudate from said predetermined dimension beyond a certain allowable limit as it makes entry to said aperture, and means operable responsive to operation of said detection means for severing said extrudate at a location adjacent said aperture to prevent entry therethrough of outsized extrudate, said last-mentioned means operating concurrently to cover said aperture to prevent outflow of coolant from said bath through said aperture.
Claim 3
Dependent Claim
75 words
The apparatus of claim 1 in which the means for severing said extrudate comprises a cutter blade slidably movable from first to second operative positions through a travel course passing adjacent said aperture, said cutter blade functioning to separate any extrudate present in said chamber from any outside extrudate upstream of said aperture during travel of said cutting blade from said first to second position, sAid cutter blade in said second position covering said aperture.
Claim 4
Dependent Claim
39 words
The apparatus of claim 2 in which said advancing means is located downstream of said chamber whereby severed extrudate present in said chamber is removed therefrom following movement of said cutter blade from said first to second operative positions.
Claim 5
Dependent Claim
25 words
The apparatus of claim 2 in which said cutter blade is moved from said first to said second operative positions by a power operated device.
Claim 6
Dependent Claim
15 words
The apparatus of claim 4 in which said power device is an air operated piston.
Claim 7
Dependent Claim
43 words
The apparatus of claim 5 in which said chamber is an elongated structure and has an end wall conaining said aperture, said cutting blade and piston being mounted on said end wall for sliding travel of said cutting blade along said end wall.
Claim 8
Dependent Claim
30 words
The apparatus of claim 6 in which guide means are provided for guiding said cutter blade during the course of its sliding travel between said first and second operative positions.
Claim 9
Dependent Claim
40 words
The apparatus of claim 7 in which there is provided an anvil disposed at the location of the end of sliding travel of said cutter blade from said first to said second positions for facilitating effecting severance of said extrudate.
Claim 10
Dependent Claim
113 words
The apparatus of claim 1 in which said chamber is an elongated structure having an end wall containing said aperture, said cutting blade and piston being mounted interiorly of said chamber, said detection means comprising a photoelectric sensing unit mounted exteriorly of said end wall, said photoelectric sensing unit including a photoelectric cell and light beam projector positioned to project a light beam against said cell and adjacent the travel course of said extrudate downstream of said extruding means and upstream of said aperture, said photocell and light beam being positioned such that outsized dimension in said extrudate interrupts the passage of said light beam from said projector means to said photo cell.
Claim 11
Dependent Claim
35 words
The apparatus of claim 9 in which said light source is adjustably mounted on said end wall to alter the allowable limit beyond said extrudate predetermined dimension which will cause interruption of said light beam.
References Cited (Backward Citations)
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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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |