US4363631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structural arrangement for oxide ceramic shafts
Assignee: Feldmuehle AG
•
Filing: 1980-06-04
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Granted: 1982-12-14
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Expires: 2000-06-04
Abstract
Abstract The shaft of a glandless pump which is made of sintered oxide ceramics in order to resist chemical attack is formed with a projection upon which there is mounted a metal sleeve having a bottom in order to enable a tool, such as a screwdriver, to be applied against the shaft for rotating the shaft when unblocking the pump without causing damage to the ceramic material of the shaft.
Inventors
- 👤 Gert Wloka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:18
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/047; F04D29/02; F04D29/026; F04D29/041; F04D29/0413; F04D29/043; F04D29/0465; F16; F16C; F16C3/00; F16C3/02; F05; F05D; F05D2300/00; F05D2300/20; F05D2300/21; Y; Y10; Y10S; Y10S464/00; Y10S464/902; Y10S464/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A shaft assembly for a glandless pump, particularly a circulating pump for heating installations, comprising: a shaft consisting essentially of oxide ceramic material and having a pair of ends; bearing means rotatively supporting said shaft intermediate said ends; a projection provided on said oxide ceramic shaft at at least one of said ends outside of said bearing means; a metal sleeve including a bottom part fixedly mounted on said projection of said shaft; and engaging means on said bottom part of said sleeve for enabling said sleeve to be engaged to effect rotation of said shaft.
Claim 2
Dependent Claim
96 words
A shaft assembly for a glandless pump, particularly a circulating pump for heating installations, comprising: a shaft consisting essentially of oxide ceramic material and having a pair of ends; bearing means rotatively supporting said shaft intermediate said ends; a projection provided on said oxide ceramic shaft at at least one of said ends outside of said bearing means; a metal sleeve including a bottom part fixedly mounted on said projection of said shaft; and engaging means on said bottom part of said sleeve for enabling said sleeve to be engaged to effect rotation of said shaft.
Claim 3
Dependent Claim
15 words
A shaft according to claim 1 wherein said metal sleeve is shrink-fitted on said shaft.
Claim 4
Dependent Claim
34 words
A shaft according to claim 1 or 2 wherein said shaft has an external diameter and wherein said metal sleeve has an external diameter which is smaller than the external diameter of said shaft.
Claim 5
Dependent Claim
21 words
A shaft according to claim 3 wherein said engaging means on said bottom part of said metal sleeve is a recess.
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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |