US3708256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion press
Assignee: Werner and Pfleiderer GmbH
•
Filing: 1970-08-06
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Granted: 1973-01-02
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Expires: 1990-08-06
Abstract
Abstract An upright extrusion press for extruding an extrudable mass such as a plasticized and/or pulverized mass includes a pressing table mounting an extrusion die and at least two pressure or extrusion pots jointly swingable about a common vertical axis for alternately moving the pots into a filling position and an extrusion position, respectively. Each of the pots comprises an extrusion bottom including an opening which is so disposed that it is in registry with the extrusion opening in the die when the pot is in its extrusion position.
Inventors
- 👤 E Kopp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/25; B29C48/36; B29C48/475
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
180 words
An extrusion molding press comprising in combination: a pressing table having at least one extrusion opening therethrough; at least two substantially alike pressure pots open at one end and closed at the other end by a bottom wall, said bottom wall having at least one extrusion nozzle therethrough and facing the pressing table parallel thereto; a frame structure mounting said pressure pots in spaced apart relationship; a pivot means disposed intermediate said pressure pots and supporting the frame structure and thus the pressure pots pivotal about an axis normal to the pressing table for selectively pivoting either one of the pressure pots into a first position in which said extrusion nozzle is in registry with the table opening or into a second position in which the extrusion nozzle is out of registry with the table opening, said first position constituting an extrusion position and the second position a filling position respectively for the pressure pots; and a pressure means movable into and out of a pressure pot in the extrusion position for compacting and extruding mass contained in said pot.
Claim 2
Dependent Claim
180 words
An extrusion molding press comprising in combination: a pressing table having at least one extrusion opening therethrough; at least two substantially alike pressure pots open at one end and closed at the other end by a bottom wall, said bottom wall having at least one extrusion nozzle therethrough and facing the pressing table parallel thereto; a frame structure mounting said pressure pots in spaced apart relationship; a pivot means disposed intermediate said pressure pots and supporting the frame structure and thus the pressure pots pivotal about an axis normal to the pressing table for selectively pivoting either one of the pressure pots into a first position in which said extrusion nozzle is in registry with the table opening or into a second position in which the extrusion nozzle is out of registry with the table opening, said first position constituting an extrusion position and the second position a filling position respectively for the pressure pots; and a pressure means movable into and out of a pressure pot in the extrusion position for compacting and extruding mass contained in said pot.
Claim 3
Dependent Claim
21 words
The extrusion press according to claim 1 wherein each of said bottom walls is axially displaceable with the respective pressure pot.
Claim 4
Dependent Claim
21 words
The extrusion press according to claim 2 wherein limit means limit axial displacement of the bottom walLs within the pressure pots.
Claim 5
Dependent Claim
45 words
The extrusion press according to claim 1 wherein the nozzle in each of said bottom walls is centrally located and has a peripheral outline larger than the peripheral outline of an extrusion opening in the pressing plate through which the mass is to be extruded.
Claim 6
Dependent Claim
76 words
The extrusion press according to claim 1 wherein a die is fitted in the extrusion opening in the pressing table, said die including two or more extrusion openings for simultaneously extruding mass through said die openings, and each of said bottom walls has in its face side facing the die when the respective pressure pot is in the extrusion position, a recess into which issue the die openings, said recess defining an extrusion pressure equalizing space.
Claim 7
Dependent Claim
34 words
The extrusion press according to claim 5 wherein wall portions of said bottom walls bounding said recess are in sealing engagement with the die when the respective pressure pot is in its extrusion position.
Claim 8
Dependent Claim
28 words
The extrusion press according to claim 6 wherein each of said bottom walls includes two or more nozzles, said nozzles being disposed in the bottom in concentric circles.
Claim 9
Dependent Claim
29 words
The extrusion press according to claim 7 wherein said nozzles have cross sectional areas different one from another, each of said circles including nozzles of equal cross sectional area.
Claim 10
Dependent Claim
68 words
The extrusion press according to claim 8 wherein each of said bottom walls has in its side facing the die for each of said circles an annular recess, each of said recesses being concentrically disposed with one of the circles of nozzles and defining an extrusion pressure equalizing space for the nozzles communicating with the respective recess when one of the pressure pots is in the extrusion position.
Claim 11
Dependent Claim
29 words
The extrusion press according to claim 9 wherein said nozzles and the respective recesses are disposed so that the cross sectional areas of the nozzles decrease in inward direction.
Claim 12
Dependent Claim
36 words
The extrusion press according to claim 10 wherein the wall portions of the bottom walls bounding said annular recesses are in sealing engagement with the die when the respective pressure pot is in its extrusion position.
Claim 13
Dependent Claim
36 words
The extrusion press according to claim 6 wherein the peripheral edge of said recess defines a cutting edge for cutting mass at said edge when the respective pressure pot is being pivoted toward the filling position.
Claim 14
Dependent Claim
39 words
The extrusion press according to claim 1 wherein the nozzle in each bottom wall defines at its lower end an edge for cutting mass at said edge when the respective pressure pot is being swung toward the filling position.
Claim 15
Dependent Claim
33 words
The extrusion press according to claim 1 and comprising a second pressure means movable into and out of a pressure pot in the filling position for preliminarily compressing mass contained in said pot.
Claim 16
Dependent Claim
39 words
The extrusion press according to claim 1 wherein said frame structure is displaceable on the pivot means in the direction for displacing the bottom walls of the pressure pots into and out of sealing engagement with the pressing table.
Claim 17
Dependent Claim
44 words
The extrusion press according to claim 15 and comprising a closure plate on the side of the pressure table facing the pot, said closure plate being disposed to be in registry with the extrusion nozzle of a pressure pot pivoted into the filling position.
Claim 18
Dependent Claim
30 words
The extrusion press according to claim 15 and comprising spring means biasing the frame structure and thus the two pressure pots out of said sealing position with the pressing table.
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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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |