US4495855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating type oil-free gas compressor
Assignee: ECTI KENKYUSHO 702 YAMANOUCHI KAMAKURA-SHI KANAGA-KEN JAPAN KK
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Filing: 1983-12-09
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Granted: 1985-01-29
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Expires: 2003-12-09
Abstract
Abstract In an oil-free multistage gas compressor comprising cylinders, a plurality of compression pistons in respective cylinders and a transmission mechanism for reciprocating said compression pistons through guide pistons serially connected to said compression pistons, the improvement wherein a common space where these pistons come in and out is defined adjacent the connections, and a diaphragm is disposed in said space transversely whereby said compression pistons are oil-tightly separated from said guide pistons.
Inventors
- 👤 Muneo Murakami
- 👤 Zentaro Ishizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:15
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/02; F04; F04B; F04B27/00; F04B27/08; F04B27/10; F04B27/1036; F04B39/00; F04B39/04; F04B39/041
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
In a multistage gas compressor in which cylinders having a plurality of compression pistons are connected to a transmission case, an oil-free gas compressor characterized in that guide pistons for imparting reciprocating movements to these compression pistons are respectively connected in series to said compression pistons, a common space where these pistons come in and out is defined adjacent the connections, and a single diaphragm is installed in said space, said diaphragm oil-tightly separating said compression pistons from said guide pistons.
Claim 2
Dependent Claim
81 words
In a multistage gas compressor in which cylinders having a plurality of compression pistons are connected to a transmission case, an oil-free gas compressor characterized in that guide pistons for imparting reciprocating movements to these compression pistons are respectively connected in series to said compression pistons, a common space where these pistons come in and out is defined adjacent the connections, and a single diaphragm is installed in said space, said diaphragm oil-tightly separating said compression pistons from said guide pistons.
Claim 3
Dependent Claim
30 words
A reciprocating type oil-free gas compressor as set forth in claim 1, wherein the outer periphery of the diaphragm is clamped between flanges of the cylinder block and transmission case.
Claim 4
Dependent Claim
36 words
A reciprocating type oil-free gas compressor as set forth in claim 1, wherein a hole formed in the diaphragm is elastically enlarged and fitted on a cylindrical portion formed on a top of a guide piston.
Claim 5
Dependent Claim
66 words
A reciprocating type oil-free gas compressor as set forth in claim 1, wherein a hole formed in the diaphragm is elastically enlarged and fitted on a cylindrical portion formed on a top of a guide piston and said diaphragm is pressed against the guide piston top by a keep collar, and wherein portions of said keep collar and guide piston top contacting the diaphragm are rounded.
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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |