US4900453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter centrifuge control
Assignee: K R A U S S - M A F F E I AKTIENGESELLSCHAFT KRAUSS-MAFFEI STRASSE 2 8000 MUNCHEN 50 W GERMANY A CORP OF GERMANY
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Filing: 1988-08-05
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Granted: 1990-02-13
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Expires: 2008-08-05
Abstract
Abstract A filter centrifuge has a feeler arm which contacts the free surface of the centrifuge contents to signify by the angular displacement of the arm, the thickness of the layer of contents in the filter drum. On the contact surface of the filter arm, at least one sensor is provided which is responsive to a characteristic of the material constructed by the arm for signalling the nature of the material.
Inventors
- 👤 Peter Sedlmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:32
CPC Classifications
B; B04; B04B; B04B13/00; B04B11/00; B04B11/04; B04B11/043
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
102 words
A filter centrifuge, comprising: a housing; a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of radial position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said sensor means including a temperature sensor.
Claim 2
Dependent Claim
102 words
A filter centrifuge, comprising: a housing; a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of radial position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said sensor means including a temperature sensor.
Claim 3
Dependent Claim
14 words
The filter centrifuge defined in claim 1, wherein said temperature sensor is a thermoelement.
Claim 4
Dependent Claim
50 words
The filter centrifuge defined in claim 1, further comprising a measuring device operatively connected to said feeler arm and responsive to a radial position of said contact surface on the contents of said drum for signalling said degree of filling of said drum in terms of position of said arm.
Claim 5
Dependent Claim
15 words
The filter centrifuge defined in claim 3 wherein said measuring device is an angular-displacement indicator.
Claim 6
Dependent Claim
15 words
The filter centrifuge defined in claim 4 wherein said angular-displacement indicator is a rotary potentiometer.
Claim 7
Dependent Claim
45 words
The filter centrifuge defined in claim 1 wherein said drum is rotatable about a drum axis, said arm extends generally perpendicular to said axis, said filter centrifuge further comprising a sensor shaft rotatable on said housing, parallel to said axis, and carrying said feeler arm.
Claim 8
Dependent Claim
20 words
The filter centrifuge defined in claim 6, further comprising a plug-and-socket coupling releasably connecting said feeler arm with said shaft.
Claim 9
Dependent Claim
17 words
The filter centrifuge defined i claim 6 wherein said feeler shaft is operatively connected with a servomechanism.
Claim 10
Dependent Claim
20 words
The filter centrifuge defined in claim 1, further comprising means connected with said arm for controlling operation of the centrifuge.
Claim 11
Dependent Claim
102 words
A filter centrifuge, comprising: a housing a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of radial position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said sensor means including an electrical-conductivity sensor.
Claim 12
Dependent Claim
102 words
A filter centrifuge, comprising: a housing a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of radial position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said sensor means including an electrical-conductivity sensor.
Claim 13
Dependent Claim
50 words
The filter centrifuge defined in claim 10, further comprising a measuring device operatively connected to said feeler arm and responsive to a radial position of said contact surface on the contents of said drum for signalling said degree of filling of said drum in terms of position of said arm.
Claim 14
Dependent Claim
15 words
The filter centrifuge defined in claim 11 wherein said measuring device is an angular-displacement indicator.
Claim 15
Dependent Claim
15 words
The filter centrifuge defined in claim 12 wherein said angular-displacement indicator is a rotary potentiometer.
Claim 16
Dependent Claim
45 words
The filter centrifuge defined in claim 10 wherein said drum is rotatable about a drum axis, said arm extends generally perpendicular to said axis, said filter centrifuge further comprising a sensor shaft rotatable on said housing, parallel to said axis, and carrying said feeler arm.
Claim 17
Dependent Claim
20 words
The filter centrifuge defined in claim 14, further comprising a plug-and-socket coupling releasably connecting said feeler arm with said shaft.
Claim 18
Dependent Claim
20 words
The filter centrifuge defined in claim 10, further comprising means connected with said arm for controlling operation of the centrifuge.
Claim 19
Dependent Claim
124 words
A filter centrifuge, comprising: a housing a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said arm in the region of said contact surface having a knife-edge shape with a narrow front edge turned in a direction opposite the direction of movement of the drum.
Claim 20
Dependent Claim
124 words
A filter centrifuge, comprising: a housing a filter drum rotatable in said housing to centrifuge a suspension in said drum; a feeler arm pivotally mounted in said housing and having means defining a contact surface for contact with the contents of said drum and having means for signalling a degree of filling of said drum in terms of position of said arm; and sensor means at said contact surface for detecting at least one physical characteristic of the contents of said drum contacted by said feeler arm for signalling the nature of said contents, said arm in the region of said contact surface having a knife-edge shape with a narrow front edge turned in a direction opposite the direction of movement of the drum.
Claim 21
Independent Claim
137 words
A method of operating a filter centrifuge, comprising the steps of: (a) introducing a suspension into a filter drum, rotatable in a centrifuge housing and driving the filter drum about an axis of the drum to centrifuge the contents of the drum; (b) monitoring the contents of said drum and the degree of filling thereof by contacting the contents of said drum with a contact surface of an arm swingably mounted on said housing and signalling a radial position of said contact surface; and (c) detecting the nature of the contents of said filter drum contacted by said arm by sensing at least one physical property of the contents of said drum at said contact surface, the physical properties of the contents of the drum which are sensed including the temperature of the contents of the drum.
Claim 22
Independent Claim
137 words
A method of operating a filter centrifuge, comprising the steps of: (a) introducing a suspension into a filter drum, rotatable in a centrifuge housing and driving the filter drum about an axis of the drum to centrifuge the contents of the drum; (b) monitoring the contents of said drum and the degree of filling thereof by contacting the contents of said drum with a contact surface of an arm swingably mounted on said housing and signalling a radial position of said contact surface; and (c) detecting the nature of the contents of said filter drum contacted by said arm by sensing at least one physical property of the contents of said drum at said contact surface, the physical properties of the contents of the drum which are sensed including the temperature of the contents of the drum.
Claim 23
Independent Claim
138 words
A method of operating a filter centrifuge, comprising the steps of: (a) introducing a suspension into a filter drum, rotatable in a centrifuge housing, and driving the filter drum about an axis of the drum to centrifuge the contents of the drum; (b) monitoring the contents of said drum and the degree of filling thereof by contacting the contents of said drum with a contact surface of an arm swingably mounted in said housing and signalling a radial position of said contact surface; and (c) detecting the nature of the contents of said filter drum contacted by said arm by sensing at least one physical property of the contents of said drum at said contact surface, the physical properties of the contents of the drum which are sensed including the electrical conductivity of the contents of the drum.
Claim 24
Independent Claim
138 words
A method of operating a filter centrifuge, comprising the steps of: (a) introducing a suspension into a filter drum, rotatable in a centrifuge housing, and driving the filter drum about an axis of the drum to centrifuge the contents of the drum; (b) monitoring the contents of said drum and the degree of filling thereof by contacting the contents of said drum with a contact surface of an arm swingably mounted in said housing and signalling a radial position of said contact surface; and (c) detecting the nature of the contents of said filter drum contacted by said arm by sensing at least one physical property of the contents of said drum at said contact surface, the physical properties of the contents of the drum which are sensed including the electrical conductivity of the contents of the drum.
References Cited (Backward Citations)
SU302138A1
Cited
US3011641A
Cited
US3044625A
Cited
US3019902A
Cited
US3141846A
Cited
US3420374A
Cited
US3446431A
Cited
US3559808A
Cited
US3752389A
Cited
DE2525232A1
Cited
US4229298A
Cited
US4382382A
Cited
US4361037A
Cited
US4689157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |