US4497615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scroll-type machine
Assignee: Copeland Corp LLC
•
Filing: 1983-07-25
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Granted: 1985-02-05
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Expires: 2003-07-25
Abstract
Abstract There is disclosed a scroll-type machine specifically suited for use as a gaseous fluid compressor. The machine has intermediate relief valve means providing variable pressure ratio characteristics to thereby improve efficiency, as well as protect against overcompression.
Inventors
- 👤 Russell W. Griffith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:52
CPC Classifications
F; F04; F04C; F04C28/00; F04C28/10; F04C28/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A scroll member suitable for constructing a scroll apparatus, comprising: (a) an end plate having a generally flat sealing surface; (b) a spiral wrap having a beginning and an end and being attached to said end plate and projecting outwardly from said sealing surface; (c) a valve port extending through said end plate intermediate of said beginning and said end of said spiral wrap, said port being generally kidney shaped in plan, one edge of said port lying immediately adjacent said wrap and being similar in shape thereto in plan; and (d) a pressure responsive valve disposed in said valve port, said valve being generally kidney shaped in plane and substantially flush with said sealing surface.
Claim 2
Dependent Claim
116 words
A scroll member suitable for constructing a scroll apparatus, comprising: (a) an end plate having a generally flat sealing surface; (b) a spiral wrap having a beginning and an end and being attached to said end plate and projecting outwardly from said sealing surface; (c) a valve port extending through said end plate intermediate of said beginning and said end of said spiral wrap, said port being generally kidney shaped in plan, one edge of said port lying immediately adjacent said wrap and being similar in shape thereto in plan; and (d) a pressure responsive valve disposed in said valve port, said valve being generally kidney shaped in plane and substantially flush with said sealing surface.
Claim 3
Dependent Claim
23 words
A scroll member as claimed in claim 1, wherein the profiles of said one edge and said wrap are involutes of a circle.
Claim 4
Dependent Claim
34 words
A scroll member as claimed in claim 1, wherein the profile of said wrap is the involute of a circle and the profile of said one edge is a circular arc approximating said involute.
Claim 5
Dependent Claim
28 words
A scroll member as claimed in claim 1, wherein said port has an inwardly tapering valve set in cross-section and said valve has a correspondingly shaped sealing surface.
Claim 6
Dependent Claim
26 words
A scroll member as claimed in claim 4, wherein the included angle of taper of said valve is substantially identical to that of said valve seat.
Claim 7
Dependent Claim
25 words
A scroll member as claimed in claim 4, wherein the included angle of taper of said valve is greater than that of said valve seat.
Claim 8
Dependent Claim
17 words
A scroll member as claimed in claim 1, wherein said valve is formed of a polymeric material.
Claim 9
Dependent Claim
17 words
A scroll member as claimed in claim 1, wherein said valve is formed of a polyimide resin.
Claim 10
Dependent Claim
34 words
A scroll member as claimed in claim 1, further comprising a spring retainer, and a spring operatively disposed between said spring retainer and said valve for normally biasing said valve to a closed position.
Claim 11
Dependent Claim
19 words
A scroll member as claimed in claim 9, wherein said spring is a generally U-shaped leaf spring in elevation.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |