Patent US4378674A successfully refreshed from Google Patents.
Patent US4036540A successfully refreshed from Google Patents.
US4036540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw extruder housing
Assignee: Werner and Pfleiderer GmbH
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Filing: 1975-05-19
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Granted: 1977-07-19
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Expires: 1995-05-19
Abstract
Abstract A screw extruder housing is made wear-resistant by providing a non-metallic lining formed of brittle material, the lining being divided into a multiplicity of individual wearing units firmly anchored in place in the casing.
Inventors
- 👤 Wilhelm Seufert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:06
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/24; B; B29; B29B; B29B7/00; B29B7/30; B29B7/58; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/68; B29C48/6801; B29C48/6803; B29C48/682; B29C48/685; B29C48/686; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/16; B29C48/03; F16C35/00; F16C35/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
In a screw extruder housing for a screw extruder machine, which housing has one or more axially parallel bores for a screw shaft, the wall of each bore being provided with a wear-resistant lining, the improvement wherein: the wall of each bore is provided over its entire periphery with a plurality of recesses which are bounded by lands formed between adjacent recesses; and each of said recesses has a wearing insert disposed therein, said insert being made of a non-metallic material more wear resistant than the wall and being produced by the process of introducing the insert material into said recesses in the wall in a formable condition, and forming and hardening the inserts in situ.
Claim 2
Dependent Claim
116 words
In a screw extruder housing for a screw extruder machine, which housing has one or more axially parallel bores for a screw shaft, the wall of each bore being provided with a wear-resistant lining, the improvement wherein: the wall of each bore is provided over its entire periphery with a plurality of recesses which are bounded by lands formed between adjacent recesses; and each of said recesses has a wearing insert disposed therein, said insert being made of a non-metallic material more wear resistant than the wall and being produced by the process of introducing the insert material into said recesses in the wall in a formable condition, and forming and hardening the inserts in situ.
Claim 3
Dependent Claim
35 words
A screw extruder housing according to claim 1, wherein the recesses are formed parallel to the axis of each bore, in the wall of the bore, the recesses having a uniform cross-section throughout their length.
Claim 4
Dependent Claim
15 words
A screw extruder housing according to claim 1, wherein the recesses have an undercut profile.
Claim 5
Dependent Claim
15 words
A screw extruder housing according to claim 1, wherein additional recesses extending non-longitudinally are provided.
Claim 6
Dependent Claim
23 words
A screw extruder housing according to claim 1, wherein the surfaces of the wearing inserts are flush with the surfaces of the lands.
Claim 7
Dependent Claim
39 words
A screw extruder housing according to claim 1, wherein the wearing inserts are constructed so as to extend from said recesses and also cover said lands to form a wear resistant lining over the entire periphery of each wall.
Claim 8
Independent Claim
97 words
A method of forming a wear resistant lining on the wall of each bore of a screw extruder housing for a screw extruder machine, which housing has one or more axially parallel bores for a screw shaft, comprising the steps of: forming a plurality of recesses, which are bounded by lands formed between adjacent recesses, in the wall of each bore over the entire periphery thereof; introducing into the recesses, in a formable condition, non-metallic material which in the hardened state is more wear resistant than the wall; and hardening the material into a wear resistant lining.
Claim 9
Independent Claim
97 words
A method of forming a wear resistant lining on the wall of each bore of a screw extruder housing for a screw extruder machine, which housing has one or more axially parallel bores for a screw shaft, comprising the steps of: forming a plurality of recesses, which are bounded by lands formed between adjacent recesses, in the wall of each bore over the entire periphery thereof; introducing into the recesses, in a formable condition, non-metallic material which in the hardened state is more wear resistant than the wall; and hardening the material into a wear resistant lining.
Claim 10
Dependent Claim
46 words
A method in accordance with claim 7, further including after said introducing step and before said hardening step, the step of forming the material into a lining disposed not only in the recesses but also covering the lands thereby covering the entire periphery of the wall.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |