US3889932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Worm throttle means
Assignee: Fried Krupp AG
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Filing: 1973-09-12
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Granted: 1975-06-17
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Expires: 1993-09-12
Abstract
Abstract A worm extruder in which a worm rotates in a cylinder and advances material therein from an inlet to a discharge. The movement of the material in the cylinder is under the control of one or more flow restricting means in the cylinder and surrounding the extrusion worm.
Inventors
- 👤 Curt Brandis
- 👤 Oskar Schatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/63; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/428; B29C48/395; B29C48/92; B29B7/58; B29B7/72; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/9258; B29C2948/92609; B29C2948/92819; B29C2948/92857; B29C2948/92876; B29C2948/92895; B29C48/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
232 words
In a worm extruder a cylinder having a feed opening near one end and a discharge at the other end, an extrusion worm rotatable in said cylinder for advancing material from said feed opening along said cylinder to said discharge, flow restricting means in said cylinder disposed a predetermined distance downstream from said feed opening and operable to control the quantity of material advanced along said cylinder by said worm, the diameter of said worm being substantially equal to the internal diameter of said cylinder, a collar formed on said worm in the axial range of said flow restricting means and having a cylindrical inner surface substantially the same diameter as said worm, the internal diameter of said flow restricting means being substantially equal to the diameter of said collar, groove means formed radially into said flow restricting means from the inside and extending therealong from one axial side of said collar to the other to provide passage means for the flow of material past the collar, said flow restricting means comprising a pair of rings in end to end relation, a portion of said groove means being formed in each said ring, and means for adjusting said rings relatively in the angular direction thereby to vary the registration of the groove means in the respective rings and in that manner to vary the effective flow area through said flow restricting means.
Claim 2
Dependent Claim
232 words
In a worm extruder a cylinder having a feed opening near one end and a discharge at the other end, an extrusion worm rotatable in said cylinder for advancing material from said feed opening along said cylinder to said discharge, flow restricting means in said cylinder disposed a predetermined distance downstream from said feed opening and operable to control the quantity of material advanced along said cylinder by said worm, the diameter of said worm being substantially equal to the internal diameter of said cylinder, a collar formed on said worm in the axial range of said flow restricting means and having a cylindrical inner surface substantially the same diameter as said worm, the internal diameter of said flow restricting means being substantially equal to the diameter of said collar, groove means formed radially into said flow restricting means from the inside and extending therealong from one axial side of said collar to the other to provide passage means for the flow of material past the collar, said flow restricting means comprising a pair of rings in end to end relation, a portion of said groove means being formed in each said ring, and means for adjusting said rings relatively in the angular direction thereby to vary the registration of the groove means in the respective rings and in that manner to vary the effective flow area through said flow restricting means.
Claim 3
Dependent Claim
39 words
A worm extruder according to claim 1 in which said means for adjusting said rings relatively comprises an adjusting member connected to at least one of said rings and protruding from said cylinder for actuation externally of said cylinder.
Claim 4
Dependent Claim
33 words
A worm extruder according to claim 2 in which said means for adjusting said rings relatively comprises an arm fixed to one of said rings and extending radially therefrom to outside said cylinder.
Claim 5
Dependent Claim
25 words
A worm extruder according to claim 1 which includes second flow restricting means in said cylinder downstream from the first mentioned said flow restricting means.
Claim 6
Dependent Claim
26 words
A worm extruder according to claim 1 which includes means for adjusting said flow restricting means to vary the degree of restriction to flow presented thereby.
Claim 7
Dependent Claim
18 words
A worm extruder according to claim 1 in which said groove means is inclined in the axial direction.
Claim 8
Dependent Claim
46 words
A worm extruder according to claim 1 in which said groove means comprises at least one groove extending generally helically inside said flow restricting means and terminating short of the opposite ends of the flow restricting means but axially outwardly from the ends of said collar.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |