US4466785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clearance-controlling means comprising abradable layer and abrasive layer
Assignee: Ingersoll Rand Co
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Filing: 1982-11-18
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Granted: 1984-08-21
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Expires: 2002-11-18
Abstract
Abstract The embodiment depicted comprises a pair of coacting rotors, in a rotary compressor, having interengaging lobes and grooves, the rotors being journaled in intersecting bores in a housing. The circumferential surfaces, and end walls of the bores are polymer-layered, and the rotors carry abrasive to machine the polymer to define an optimum clearance for rotor rotation within the bores, and in coaction together. Each rotor is polymer-coated and abrasive particles are borne in the polymer on the outer edges of the lobes and in discrete radial patterns on the rotor sides. The method defines the polymer-coating and abrasive particles-deposition steps.
Inventors
- 👤 Chandi P. Biswas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:31
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/126; B; B24; B24B; B24B19/00; B24B19/08; F01C21/00; F01C21/10; F01C21/104; F01C21/106; F04; F04C; F04C2230/00; F04C2230/90; F04C2230/91; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49245
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
165 words
Clearance-controlling means, in a machine having a rotary element, comprising: a machine having a housing; said housing having a chamber formed therein; said chamber having a circumferential surface bounded by a pair of spaced-apart end walls; a given rotor mounted for rotation within said chamber; said rotor having a radial lobe for sweeping about said circumferential surface in close proximity to said surface; and said surface and said lobe each having means fixed thereon cooperatively defining an interface therebetween with a single, uniform clearance; wherein said means comprises a pair of layers of material, one of said layers being fixed to said lobe, and the other being fixed to said surface; one of said layers comprises an abradable material, and the other of said layers comprises an abrasive material; said abrasive material comprises particles; said particles have a generally common diameter, each thereof buttressing, and being buttressed by, the others thereof; and substantially all of said particles cooperate to define a substantially uniform abrasive surface.
Claim 2
Dependent Claim
165 words
Clearance-controlling means, in a machine having a rotary element, comprising: a machine having a housing; said housing having a chamber formed therein; said chamber having a circumferential surface bounded by a pair of spaced-apart end walls; a given rotor mounted for rotation within said chamber; said rotor having a radial lobe for sweeping about said circumferential surface in close proximity to said surface; and said surface and said lobe each having means fixed thereon cooperatively defining an interface therebetween with a single, uniform clearance; wherein said means comprises a pair of layers of material, one of said layers being fixed to said lobe, and the other being fixed to said surface; one of said layers comprises an abradable material, and the other of said layers comprises an abrasive material; said abrasive material comprises particles; said particles have a generally common diameter, each thereof buttressing, and being buttressed by, the others thereof; and substantially all of said particles cooperate to define a substantially uniform abrasive surface.
Claim 3
Dependent Claim
108 words
Clearance-controlling means, according to claim 1, wherein: said rotor has opposite sides which confront said end walls for rotatably planing across said walls in close proximity to said walls; and each of said sides and each of said walls have prescribed means fixed thereon cooperatively defining interfaces, between each said side and each said wall confronted thereby, of a uniform clearance; wherein said prescribed means comprises first coatings of material fixed to said walls, and second coatings of material fixed to said sides; and one of said first and second coatings comprises an abradable material, and the other of said first and second coatings comprises an abrasive material.
Claim 4
Dependent Claim
17 words
Clearance-controlling means, according to claim 1, wherein: said layer fixed to said lobe comprises said abrasive material.
Claim 5
Dependent Claim
18 words
Clearance-controlling means, according to claim 2, wherein: said second coatings fixed to said sides comprise said abrasive material.
Claim 6
Dependent Claim
23 words
Clearance-controlling means, according to claim 4, wherein: said abrasive material is in a plurality of discrete patterns on both sides of said rotor.
Claim 7
Dependent Claim
17 words
Clearance-controlling means, according to claim 5, wherein: said patterns comprise substantially radially-oriented depositions of said abrasive material.
Claim 8
Dependent Claim
28 words
Clearance-controlling means, according to claim 4, wherein: said second coatings further comprise a polymer containing material; and said abrasive material is partially embedded in said polymer containing material.
Claim 9
Dependent Claim
21 words
Clearance-controlling means, according to claim 7, wherein: said polymer containing material has a thickness of not less than half said diameter.
Claim 10
Dependent Claim
118 words
Clearance-controlling means, according to claim 1, wherein: said chamber has a pair of intersecting bores; said given rotor is mounted for rotation in one of said bores; and further including a second rotor mounted for rotation in the other of said bores; wherein said second rotor has a radial lobe; each of said rotors has a radial groove formed therein, to accommodate an intermeshing, near-contacting engagement of said lobe of said given rotor with said groove of said second rotor, and said lobe of said second rotor with said groove of said given rotor; and one of said given and second rotors has a layer of said abrasive material fixed to a major portion of the periphery thereof.
Claim 11
Dependent Claim
33 words
Clearance-controlling means, according to claim 9, wherein: said radial groove of said one rotor has an intermediate portion thereof with a convex surface; and said intermediate portion is devoid of said abrasive material.
Claim 12
Dependent Claim
30 words
Clearance-controlling means, according to claim 9, wherein: the other of said given and second rotors has a layer of said abrasive material fixed only on the radially outermost surface thereof.
Claim 13
Dependent Claim
27 words
Clearance-controlling means, according to claim 9, wherein: the other of said given and second rotors has a layer of polymer coating fixed on the full periphery thereof.
Claim 14
Dependent Claim
22 words
Clearance-controlling means, according to claim 9, wherein: said one rotor has a layer of polymer coating fixed on the full periphery thereof.
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) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |