Patent US3841573A successfully refreshed from Google Patents.
US3841573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding apparatus for fibrous material
Assignee: Sulzer Escher Wyss GmbH
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Filing: 1972-09-14
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Granted: 1974-10-15
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Expires: 1992-09-14
Abstract
Abstract Grinding device, more especially a disc refiner for the paper industry, which grinding device comprises, in a housing having two end covers, a rotor and a stator which is displaceable axially relatively to the rotor and which is guided radially but non-rotatably relatively to the housing in guideways on the housing, which stator is connected to a cylindrical part which is coaxial with the stator and with the grinding device and which extends outwardly through a central opening in one of the end covers and is sealed off relatively to the central opening, the improvement that said guideways for said stator are situated outside the range of the stock to be ground.
Inventors
- 👤 A Kahmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:16
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/30; D21D1/303; B; B02; B02C; B02C7/00; B02C7/11; B02C7/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
A grinding device including a housing having two end covers and containing a stator disc which is provided with a central opening and which, with an adjacent one of said end covers, bounds a space which is charged with stock during operation of the grinding device, the stator disc being movable axially relatively to a rotor disc with which it defines a grinding gap and being connected with a cylindrical part which is coaxial with that disc and the housing and projects from the latter through a central opening in said adjacent end cover and is sealed relatively thereto; a servomotor connected to the cylindrical part and serving to effect axial movement of the stator disc; and guideway means, including cooperating elements connected; respectively with the stator disc and the housing, for guiding said stator disc for said axial movement; and characterized in that there are a plurality of said guideway means which are distributed equiaNgularly about the axis of the cylindrical part and which are situated outside said space charged with stock, whereby clogging of the guideway means by the stock is precluded.
Claim 2
Dependent Claim
184 words
A grinding device including a housing having two end covers and containing a stator disc which is provided with a central opening and which, with an adjacent one of said end covers, bounds a space which is charged with stock during operation of the grinding device, the stator disc being movable axially relatively to a rotor disc with which it defines a grinding gap and being connected with a cylindrical part which is coaxial with that disc and the housing and projects from the latter through a central opening in said adjacent end cover and is sealed relatively thereto; a servomotor connected to the cylindrical part and serving to effect axial movement of the stator disc; and guideway means, including cooperating elements connected; respectively with the stator disc and the housing, for guiding said stator disc for said axial movement; and characterized in that there are a plurality of said guideway means which are distributed equiaNgularly about the axis of the cylindrical part and which are situated outside said space charged with stock, whereby clogging of the guideway means by the stock is precluded.
Claim 3
Dependent Claim
34 words
A grinding device as defined in claim 1 in which the cooperating elements of the guideway means are connected, respectively, to an outside surface of said adjacent end cover and to said cylindrical part.
Claim 4
Dependent Claim
59 words
A grinding device as defined in claim 1 in which the cooperating elements of each guideway means comprise a sleeve which is parallel with the cylindrical part, and a bolt mounted in the sleeve for reciprocation relatively thereto; and one element of each guideway means is connected with the stator disc through an arm fixed to the cylindrical part.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |