US4256352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Needle journal bearing for a magnetically supported rotor shaft of a measuring instrument
Assignee: Siemens AG
•
Filing: 1979-01-31
•
Granted: 1981-03-17
•
Expires: 1999-01-31
Abstract
Abstract A needle bearing for a magnetically supported rotor shaft in a measuring instrument, such as a watt-hour meter, having a thin metal bearing needle projecting into a plastic needle guide having good wear and friction properties is provided in a manner advantageous from a production point of view, while providing high guidance accuracy and good cooling of the structure, by means of a coating on the needle having good sliding properties in the region interacting with the needle guide. The coating takes the form of a sleeve which can be slipped onto the bearing needle and replaced in a most simple manner.
Inventors
- 👤 Heinz Petrak
- 👤 Gunther Vieweg
- 👤 Martin Weinicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:07
CPC Classifications
F; F16; F16C; F16C39/00; F16C39/06; F16C39/063; F16C17/00; F16C17/04; F16C17/08; F16C32/00; F16C32/04; F16C32/0406; F16C32/0408; F16C32/0423; F16C32/0427; F16C33/00; F16C33/02; F16C33/04; F16C33/20; G; G01; G01D; G01D11/00; G01D11/02; F16C2208/00; F16C2208/20; F16C2208/60; F16C2208/66; F16C2370/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
A needle journal bearing for a magnetically supported rotor shaft of a measuring instrument, such as a watt-hour meter, comprising a thin metal bearing needle protruding into a needle guide made of polyoxymethylene, the bearing needle being provided, at least in the region interacting with the needle guide, with a covering in the form of a sleeve of polyamide which is slipped onto the needle.
Claim 2
Dependent Claim
65 words
A needle journal bearing for a magnetically supported rotor shaft of a measuring instrument, such as a watt-hour meter, comprising a thin metal bearing needle protruding into a needle guide made of polyoxymethylene, the bearing needle being provided, at least in the region interacting with the needle guide, with a covering in the form of a sleeve of polyamide which is slipped onto the needle.
Claim 3
Dependent Claim
36 words
A needle journal in accordance with claim 1 in which the sleeve extends along the needle, out of the needle guide, and further comprising a collar on the sleeve at a distance from the needle guide.
Claim 4
Dependent Claim
37 words
A needle journal bearing in accordance with claim 1 further comprising the needle guide being a bore hole in a plastic hub which is connected to the end of the rotor shaft and carries a ring magnet.
Claim 5
Dependent Claim
24 words
A needle journal bearing in accordance with claim 3 further comprising the bore hole being located in a cylindrical extension of the plastic hub.
Claim 6
Dependent Claim
25 words
A needle journal bearing in accordance with claim 4 further comprising the cylindrical extension extending into the interior of a collar of a needle bushing.
Claim 7
Dependent Claim
136 words
A needle journal bearing for a magnetically supported rotor shaft of a measuring instrument comprising: a thin metal bearing needle supported in a needle bushing; a collar extending concentrically around the needle from an endface of the bushing; a replaceable plastic sleeve covering the needle and protruding therewith into a needle guide made of plastic, the plastics of the sleeve and the needle guide being chosen to provide low friction and wear between the respective surfaces in sliding engagement; the needle guide comprising a hole in a cylindrical extension of a plastic hub fastened to the end of the rotor shaft and to a concentric ring magnet and the cylindrical extension protruding into the collar on the endface of the needle bushing; and a collar spaced apart from the needle guide on the replaceable plastic sleeve.
Claim 8
Dependent Claim
136 words
A needle journal bearing for a magnetically supported rotor shaft of a measuring instrument comprising: a thin metal bearing needle supported in a needle bushing; a collar extending concentrically around the needle from an endface of the bushing; a replaceable plastic sleeve covering the needle and protruding therewith into a needle guide made of plastic, the plastics of the sleeve and the needle guide being chosen to provide low friction and wear between the respective surfaces in sliding engagement; the needle guide comprising a hole in a cylindrical extension of a plastic hub fastened to the end of the rotor shaft and to a concentric ring magnet and the cylindrical extension protruding into the collar on the endface of the needle bushing; and a collar spaced apart from the needle guide on the replaceable plastic sleeve.
Claim 9
Dependent Claim
22 words
The needle journal bearing of claim 6 which the needle guide is made of polyoxymethylene and the sleeve is made of polyamide.
References Cited (Backward Citations)
CH74652A
Cited
CH90510A
Cited
US1691039A
Cited
GB544800A
Cited
US3107948A
Cited
US3233950A
Cited
US3370896A
Cited
US3810683A
Cited
DE2358225A1
Cited
DE2506741A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |