Patent US4292414A successfully refreshed from Google Patents.
US3902835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus with two part openable head
Assignee: Individual
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Filing: 1973-07-25
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Granted: 1975-09-02
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Expires: 1993-07-25
Abstract
Abstract The extrusion head of a wide profile extruder is divided into two halves which are hingely mounted on the front end of the barrel of the extruder so as to swing outwardly away from one another and away from the barrel when it is desired to open the extrusion head for cleaning. The two halves of the head are swingable through a sufficient angle to permit removal of the extrusion screw from the front end of the barrel. Hydraulically operated clamps are engageable with wedge surfaces provided on the two halves of the extrusion head so as to exert forces in a direction to force the two halves together and also toward the front end of the barrel thereby providing a tight closure capable of resisting the high forces generated in the extruder during operation. The clamps are hingely mounted on opposite sides of the barrel so that they can be swung out of engagement with the two halves of the extrusion head to permit opening of the head.
Inventors
- 👤 Helmuth Theysohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:20
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29B; B29B7/00; B29B7/30; B29B7/58; B29B7/582; B29C48/03; B29C48/07; B29C48/08; B29C48/256; B29C48/2562
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
162 words
Extrusion apparatus, comprising; a barrel; an extrusion screw rotatable in said barrel; an extrusion head for wide extrusions at the extrusion end of said barrel, said extrusion head comprising two halves both hingedly mounted on said barrel to swing outwardly away from one another through a sufficient angle to permit removal of said screw from said barrel by passing between said extrusion head halves when swung outwardly; means for exerting forces on said halves of said extrusion head to press them toward one another and also toward said barrel to provide a pressure tight fluid seal between said halves and a pressure-tight seal between each half and said barrel, said means comprising, cam surfaces on said halves, clamping means engageable with said cam surfaces and means for moving said clamping means in a direction to engage said cam surfaces; said clamping means comprising cam followers and means pivotally mounting said cam followers to swing outwardly out of engagement with said cam surfaces.
Claim 2
Dependent Claim
162 words
Extrusion apparatus, comprising; a barrel; an extrusion screw rotatable in said barrel; an extrusion head for wide extrusions at the extrusion end of said barrel, said extrusion head comprising two halves both hingedly mounted on said barrel to swing outwardly away from one another through a sufficient angle to permit removal of said screw from said barrel by passing between said extrusion head halves when swung outwardly; means for exerting forces on said halves of said extrusion head to press them toward one another and also toward said barrel to provide a pressure tight fluid seal between said halves and a pressure-tight seal between each half and said barrel, said means comprising, cam surfaces on said halves, clamping means engageable with said cam surfaces and means for moving said clamping means in a direction to engage said cam surfaces; said clamping means comprising cam followers and means pivotally mounting said cam followers to swing outwardly out of engagement with said cam surfaces.
Claim 3
Dependent Claim
61 words
Extrusion apparatus according to claim 1, in which said extrusion head has a separation plane in which said two halves contact one another in use of the extrusion head, and said cam surfaces comprise symmetrical inclined surfaces on opposite sides of said separation plane of said extrusion head, said inclined surfaces diverging from one another in a direction toward said barrel.
Claim 4
Dependent Claim
22 words
Extrusion apparatus according to claim 2, in which said a cam follower is movable in a direction parallel to said separation plane.
Claim 5
Dependent Claim
43 words
Extrusion apparatus according to claim 3, in which the inclination of said inclined surfaces is selected to provide clamping forces exceeding forces which tend to separate said extrusion head halves from the barrel and from one another in use of the extrusion head.
Claim 6
Dependent Claim
57 words
Extrusion apparatus according to claim 1, in which each of said clamping means comprises a fluid pressure cylinder, means hingedly mounting said cylinder at one end thereof on a side of said barrel, a piston having a piston rod extending from the other end of said cylinder, and means mounting said cam follower on said piston rod.
Claim 7
Dependent Claim
41 words
Extrusion apparatus according to claim 5, in which said fluid pressure cylinder is double acting so as to move said cam follower in one direction for clamping said extrusion head halves and in the opposite direction for opening said extrusion head.
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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |