Patent US4861536A successfully refreshed from Google Patents.
US4861536A
Expired / Lapsed
US
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Method for manufacturing a sealing ring
Assignee: Carl Freudenberg KG
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Filing: 1987-06-12
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Granted: 1989-08-29
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Expires: 2007-06-12
Abstract
Abstract A method for manufacture of a sealing ring with a flanged sealing lip having hydrodynamically acting return transport properties in which a sealing lip is first generated by extrusion of a plastically deformable material through a ring nozzle having rotating inner and outer surfaces which are rotated relative to each other to impart a helical motion to the extruded material; the hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded hollow cylinder. The extruded cylinder is then solidified and cut to a predetermined length. The cylinder is then widened in the radial direction at its front end by an assembly tool which shapes the cylinder into a trumpet-shaped sealing ring with a flanged sealing lip.
Inventors
- 👤 Gunter Graf
- 👤 Heinz Gross
- 👤 Stefan Sponagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:31
CPC Classifications
B; B29; B29C; B29C57/00; B29D; B29D99/00; B29D99/0053; F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3244; F16J15/328; B29C43/00; B29L; B29L2031/00; B29L2031/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A method for manufacturing a sealing ring with a sealing lip having hydrodynamically-acting return transport properties, comprising the steps of: extruding a plastically deformable material through a ring nozzle having an exit slot, the extruded plastically deformable material having a surface; causing helical flow of said plastically deformable material at said exit slot thereby generating hydrodynamically acting return transport properties in the surface of the plastically deformable material during extrusion thereof prior to solidification after said extruding, said hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded material; solidifying the extruded material with the hydrodynamically acting return transport properties; cutting the solidified extruded material to a predetermined length thereby forming a hose-shaped sleeve; axially inserting the sleeve onto one end of a shaped piece having at an opposite end a continuously increasing diameter and terminating in a stiffening ring at the opposite end; and pushing the sleeve along the shaped piece towards the opposite end thereof so that the shaped piece and the stiffening ring cooperate to form a flange at a lip of the sleeve.
Claim 2
Independent Claim
183 words
A method for manufacturing a sealing ring with a sealing lip having hydrodynamically-acting return transport properties, comprising the steps of: extruding a plastically deformable material through a ring nozzle having an exit slot, the extruded plastically deformable material having a surface; causing helical flow of said plastically deformable material at said exit slot thereby generating hydrodynamically acting return transport properties in the surface of the plastically deformable material during extrusion thereof prior to solidification after said extruding, said hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded material; solidifying the extruded material with the hydrodynamically acting return transport properties; cutting the solidified extruded material to a predetermined length thereby forming a hose-shaped sleeve; axially inserting the sleeve onto one end of a shaped piece having at an opposite end a continuously increasing diameter and terminating in a stiffening ring at the opposite end; and pushing the sleeve along the shaped piece towards the opposite end thereof so that the shaped piece and the stiffening ring cooperate to form a flange at a lip of the sleeve.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein the step of causing helical flow comprises the step of relatively rotating inner and outer surfaces of the exit slot of the ring nozzle.
Claim 4
Dependent Claim
30 words
A method according to claim 1 wherein said material to be extruded contains short fibers and said helical flow causes said fibers to be preferentially aligned in a stretched-out configuration.
Claim 5
Independent Claim
143 words
A method for manufacturing a sealing ring having hydrodynamically acting return transport properties, comprising the steps of: extruding a hollow cylinder of plastically deformable material through a ring nozzle having an exit slot, said extruded hollow cylinder having a surface; relatively rotating inner and outer surfaces of the ring nozzle at said exit slot during extrusion of the plastically deformable material thereby imparting a helical motion to the extruded material and thereby generating hydrodynamically acting return transport properties in the surface of the extruded hollow cylinder of plastically deformable material prior to solidification after said extruding, said hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded hollow cylinder; solidifying the extruded cylinder; cutting the extruded cylinder to a predetermined length; and shaping the cylinder into a sealing ring having a trumpet-shaped end with a flanged lip.
Claim 6
Independent Claim
143 words
A method for manufacturing a sealing ring having hydrodynamically acting return transport properties, comprising the steps of: extruding a hollow cylinder of plastically deformable material through a ring nozzle having an exit slot, said extruded hollow cylinder having a surface; relatively rotating inner and outer surfaces of the ring nozzle at said exit slot during extrusion of the plastically deformable material thereby imparting a helical motion to the extruded material and thereby generating hydrodynamically acting return transport properties in the surface of the extruded hollow cylinder of plastically deformable material prior to solidification after said extruding, said hydrodynamically acting return transport properties being a microscopically fine pleating of the surface of the extruded hollow cylinder; solidifying the extruded cylinder; cutting the extruded cylinder to a predetermined length; and shaping the cylinder into a sealing ring having a trumpet-shaped end with a flanged lip.
Claim 7
Dependent Claim
96 words
The method of claim 4 wherein said step of shaping comprises the steps of: disposing the cut cylinder on one end of a first shaped piece having at an opposite end a continuously increasing diameter and terminating in a stiffening ring at the opposite end; pressing a second shaped piece against the cylinder to force same along the first shaped piece to widen one end of said cylinder; and crimping the widened end of said cylinder by pressing said widened end between the stiffening ring and a third shaped piece coaxial with the second shaped piece.
Claim 8
Dependent Claim
24 words
The method of claim 5, further comprising the step of rotating the first shaped piece and the second shaped piece relative to one another.
Claim 9
Dependent Claim
30 words
A method according to claim 4 wherein said material to be extruded contains short fibers and said helical flow causes said fibers to be preferentially aligned in a stretched-out configuration.
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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |