US3788784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Globoid worm fluid-flow machines
Assignee: Individual
•
Filing: 1972-07-03
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Granted: 1974-01-29
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Expires: 1992-07-03
Abstract
Abstract The invention relates to machines such as compressors or pumps of the kind including an hourglass worm meshing with a toothed pinion. It is known to make the pinion of metal coated with a resilient material such as plastic rigidity fixed to the surface of the metallic pinion. According to the invention the metal pinion is covered with a plastic lining having teeth which engage the threads of the worm and prevent the metal teeth of the pinion from engaging those threads. The plastic lining is permitted a slight shifting about its average position respectively to the metal pinion.
Inventors
- 👤 B Zimmern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:52
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/08; F01C3/00; F01C3/02; F01C3/025; F01D; F01D1/00; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19642; Y10T74/19698; Y10T74/19828; Y10T74/19949; Y10T74/19953
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
160 words
In a globoid or hourglass worm fluid flow machine, such as a compressor, pump or expansion unit, comprising a multi-threaded hourglass rotor, at least one toothed metal pinion whose teeth cooperate with said threads and have one face subjected to the fluid pressure, and a casing at least partially covering said rotor; the improvement in which the width of the teeth of the metal pinion is smaller than the distance between two contiguous threads of the rotor, a plastic material lining covering at least part of said face of the pinion which is subjected to the fluid pressure, the parts of this lining which cover the teeth of the pinion being wider than said teeth, in order to have said parts in touch with the threads of the rotor and to avoid contact of the teeth of the metal pinion with said threads, and means to allow a slight shift of said lining around its average position on the pinion.
Claim 2
Dependent Claim
160 words
In a globoid or hourglass worm fluid flow machine, such as a compressor, pump or expansion unit, comprising a multi-threaded hourglass rotor, at least one toothed metal pinion whose teeth cooperate with said threads and have one face subjected to the fluid pressure, and a casing at least partially covering said rotor; the improvement in which the width of the teeth of the metal pinion is smaller than the distance between two contiguous threads of the rotor, a plastic material lining covering at least part of said face of the pinion which is subjected to the fluid pressure, the parts of this lining which cover the teeth of the pinion being wider than said teeth, in order to have said parts in touch with the threads of the rotor and to avoid contact of the teeth of the metal pinion with said threads, and means to allow a slight shift of said lining around its average position on the pinion.
Claim 3
Dependent Claim
35 words
A machine according to claim 1, wherein said means to allow a slight shift of said lining comprises means mounting said lining on said pinion for limited sliding movement on and relative to said teeth.
Claim 4
Dependent Claim
27 words
A machine according to claim 1, wherein that face of the teeth of the lining which is subjected to the fluid pressure is arranged in a plane.
Claim 5
Dependent Claim
27 words
A machine according to claim 1, wherein that face of the teeth of the lining which is subjected to the fluid pressure is formed in cylindrical arrangement.
Claim 6
Dependent Claim
21 words
A machine according to claim 1, wherein the plastic material lining is bound to the metal pinion with a flexible attachment.
Claim 7
Dependent Claim
50 words
A machine according to claim 5, wherein the metal pinion bears at least one protruding plug housed within a hollow part of the plastic liner, a resilient ring being arranged around the plug of the pinion, between the walls of the hollow part of the plastic liner and said plug.
Claim 8
Dependent Claim
44 words
A machine according to claim 1, wherein those parts of the liner which cover the pinion teeth have a region of reduced cross-sectional area, said region being located beyong those zones of said parts of the liner which engage the threads of the rotor.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |