US4624577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw element for a material processing machine
Assignee: Clextral SAS
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Filing: 1985-03-18
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Granted: 1986-11-25
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Expires: 2005-03-18
Abstract
Abstract A screw element for use in a material-processing machine comprising at least one screw formed by a central driving shaft (2) on which are mounted a plurality of hollow elements (12, 13 . . . ) provided on their inner wall with grooves (31) engaging with corresponding splines (21) of the central shaft (2). A cylindrical inner collar (3) made from a product resistant to the mechanical driving stresses and on the inner wall (32) of which are formed the grooves (31) corresponding to the splines (21) of the shaft, and an outer collar (4) made from a product resistant to the abrasion of the processed material and on which are formed, within the body of the outer collar, helical threads (42) or other peripheral material-processing means, the outer collar (4) being mounted without clearance on the inner collar (3) and being connected to the inner collar for rotation therewith. The invention is applicable in particular to the construction of extruding machines.
Inventors
- 👤 Jean Vannier
- 👤 Francis Mourrier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/256; B29C48/2564; B29C48/03
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A screw element for use in a material-processing machine comprising at least one screw which is driven in rotation inside an elongated sleeve and including a central driving shaft on which are mounted a plurality of hollow screw elements provided on their inner wall with grooves engaging corresponding splines on the central shaft and provided on their periphery with material-processing means, each said screw element comprising a cylindrical inner collar made from a product resisting mechanical driving stresses and an outer collar made from a product capable of resisting abrasion of the processed material, said inner collar and said outer collar being symmetrical relative to a median plane perpendicular to the axis of said shaft, and said inner collar having a length less than the length of said outer collar so as to define at both ends of said screw element two semi-grooves having a height equal to the thickness of said inner collar, so that confronting semi-grooves of two adjoining screw elements define a circular recess for a sealing gasket interposed between said adjoining screw elements.
Claim 2
Dependent Claim
177 words
A screw element for use in a material-processing machine comprising at least one screw which is driven in rotation inside an elongated sleeve and including a central driving shaft on which are mounted a plurality of hollow screw elements provided on their inner wall with grooves engaging corresponding splines on the central shaft and provided on their periphery with material-processing means, each said screw element comprising a cylindrical inner collar made from a product resisting mechanical driving stresses and an outer collar made from a product capable of resisting abrasion of the processed material, said inner collar and said outer collar being symmetrical relative to a median plane perpendicular to the axis of said shaft, and said inner collar having a length less than the length of said outer collar so as to define at both ends of said screw element two semi-grooves having a height equal to the thickness of said inner collar, so that confronting semi-grooves of two adjoining screw elements define a circular recess for a sealing gasket interposed between said adjoining screw elements.
Claim 3
Dependent Claim
18 words
A screw element according to claim 1, wherein said material-processing means on the outer collar are screw threads.
Claim 4
Dependent Claim
27 words
A screw element according to claim 1, wherein the outer collar is connected to rotate with the inner collar by an interference fit on the inner collar.
Claim 5
Dependent Claim
24 words
A screw element according to claim 1, wherein the outer collar is connected to rotate with the inner collar by adhesion between the collars.
Claim 6
Dependent Claim
24 words
A screw element according to claim 1, wherein the outer collar is connected to rotate with the inner collar by welding between the collars.
Claim 7
Dependent Claim
24 words
A screw element according to claim 1, wherein the outer collar is connected to rotate with the inner collar by brazing between the collars.
Claim 8
Dependent Claim
19 words
A screw element according to claim 1, wherein the outer collar is precision molded from a product resisting abrasion.
Claim 9
Dependent Claim
17 words
A screw element according to claim 1, wherein the outer collar is made from an anti-abrasion alloy.
Claim 10
Dependent Claim
14 words
A screw element according to claim 1, wherein said alloy is based on cobalt.
Claim 11
Dependent Claim
14 words
A screw element according to claim 1, wherein said alloy is based on nickel.
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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |