Patent US4086043A successfully refreshed from Google Patents.
US4086043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor with plastic sheathing
Assignee: Ingersoll Rand Co
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Filing: 1976-12-30
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Granted: 1978-04-25
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Expires: 1996-12-30
Abstract
Abstract The rotor, in the embodiment depicted, comprises a rotor blank having a hub with at least one radially extending tooth, the rotor being sheathed in plastic, excepting for the hub surface areas. Throughgoing bores formed in the blank receive plugs or dowels of the plastic to secure the sheathing in place. Additionally, the periphery of the blank has an inwardly-widening groove formed therein to fix plastic sheathing also on the periphery. The rotor is formed of steel, and the plastic sheathing has a coefficient of expansion which is the same as that of the steel.
Inventors
- 👤 Frank D. Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:14
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F02; F02B; F02B77/00; F02B77/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31533
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A rotor, for use in a rotary, positive-displacement fluid machine, comprising: a rotor blank having a hub, and at least one radial tooth extending from said hub; said hub having a given thickness; said tooth having another thickness which is less than said given thickness; said given and another thicknesses define in said blank, on opposite sides of said tooth, a pair of recessed lands; and a sheathing of plastic, fixed on said lands, and therebetween in traverse of said blank, having surfaces which are substantially co-planar with surfaces of said hub; wherein said blank is formed of a given material other than plastic having a prescribed coefficient of expansion; said sheathing has a coefficient of expansion which is substantially equal to said prescribed coefficient of expansion; said blank has a single, continuous groove formed in and fully along the outermost peripheral surface thereof; said groove being of reentrant configuration, having a wider inner than outer dimension; and wherein said sheathing further overlies said periphery, and is nestedly locked in said groove.
Claim 2
Dependent Claim
172 words
A rotor, for use in a rotary, positive-displacement fluid machine, comprising: a rotor blank having a hub, and at least one radial tooth extending from said hub; said hub having a given thickness; said tooth having another thickness which is less than said given thickness; said given and another thicknesses define in said blank, on opposite sides of said tooth, a pair of recessed lands; and a sheathing of plastic, fixed on said lands, and therebetween in traverse of said blank, having surfaces which are substantially co-planar with surfaces of said hub; wherein said blank is formed of a given material other than plastic having a prescribed coefficient of expansion; said sheathing has a coefficient of expansion which is substantially equal to said prescribed coefficient of expansion; said blank has a single, continuous groove formed in and fully along the outermost peripheral surface thereof; said groove being of reentrant configuration, having a wider inner than outer dimension; and wherein said sheathing further overlies said periphery, and is nestedly locked in said groove.
Claim 3
Dependent Claim
56 words
A rotor, according to claim 1, wherein: said recess is of dove-tail shape, in cross-section; said blank has a plurality of throughgoing bores which open onto said lands; and said sheathing is fixed on said lands by plugs or dowels of said plastic which are formed in said bores and which are integral with said sheathing.
Claim 4
Dependent Claim
80 words
A rotor, according to claim 2, wherein: said blank has a plurality of radial teeth; said hub is defined as a pair of circular, raised and opposed bosses; each of said teeth of said plurality thereof being of said another thickness and defining in said blank, on opposite sides of said teeth, pairs of recessed lands; and circumscribing lands, contiguous and co-planar with said recessed lands, and in envelopment of said bosses, formed in said blank on opposite sides thereof.
Claim 5
Dependent Claim
15 words
A rotor, according to claim 3, wherein: said sheathing is fixed on said circumscribing lands.
Claim 6
Dependent Claim
14 words
A rotor, according to claim 4, wherein: said sheathing is formed of polyphenylene sulfide.
Claim 7
Dependent Claim
71 words
A rotor, according to claim 2, wherein: said blank has given ones of said bores formed in relatively radial adjacency to said peripheral surface, and other ones thereof relatively radially spaced inwardly of said given bores; said peripheral surface has a prescribed, transverse dimension; and said given bores, having said plugs or dowels formed therein, are all within a distance from said peripheral surface which is less than said transverse dimension.
Claim 8
Dependent Claim
51 words
A rotor, according to claim 6, wherein: said tooth has a profile which defines a concavity in said blank; and at least one of said bores, having one of said plugs or dowels formed therein, is spaced apart from said concavity a distance of not more than half said transverse dimension.
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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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |