Patent US4627795A successfully refreshed from Google Patents.
US4627795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston assembly for a compressor or the like
Assignee: Atlas Copco AB
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Filing: 1983-03-29
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Granted: 1986-12-09
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Expires: 2003-03-29
Abstract
Abstract A tandem piston arrangement for a compressor, especially for a dry-running compressor for the high pressure compression of gases such as oxygen, has one piston of the common rod form as a guide piston with piston and guide rings in engagement with the respective cylinder, and at least one other piston as a contactless piston. By thus moving the guide point of the rod with the contactless piston, the length of any vibratile portion of the rod carrying the contactless piston remains constant during reciprocation of the assembly and the vibratile natural frequency thus does not change during operation.
Inventors
- 👤 Hans-Helmut Schmitz-Montz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/04; F04B25/00; F04B39/041; F04B39/045; F04B53/00; F04B53/008
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A piston compressor comprising housing means including a plurality of axially spaced cylinders having respective cylindrical walls, and a piston assembly reciprocatable in said cylinders, said assembly comprising a piston rod and respective pistons secured to said rod in axially spaced relationship and each received in a respective one of said cylinders for compressing gas therein, guide piston means formed by at least one of said pistons constituted as a guide piston and being provided with piston and guide rings slidably engaging a wall of the respective cylinder, at least one other of said pistons being provided as a contactless piston maintaining a clearance with the wall of the respective cylinder, said guide piston means constituting the sole guiding means reciprocation of said assembly in said housing means, said rod being received with clearance over its entire length within said housing whereby said assembly is unsupported except by said guide piston means.
Claim 2
Dependent Claim
152 words
A piston compressor comprising housing means including a plurality of axially spaced cylinders having respective cylindrical walls, and a piston assembly reciprocatable in said cylinders, said assembly comprising a piston rod and respective pistons secured to said rod in axially spaced relationship and each received in a respective one of said cylinders for compressing gas therein, guide piston means formed by at least one of said pistons constituted as a guide piston and being provided with piston and guide rings slidably engaging a wall of the respective cylinder, at least one other of said pistons being provided as a contactless piston maintaining a clearance with the wall of the respective cylinder, said guide piston means constituting the sole guiding means reciprocation of said assembly in said housing means, said rod being received with clearance over its entire length within said housing whereby said assembly is unsupported except by said guide piston means.
Claim 3
Dependent Claim
38 words
The compressor defined in claim 1 wherein said guide piston and the respective cylinder operates for relatively low pressure compression of gas whereas said contactless piston and the respective cylinder operates for comparatively high pressure compression of gas.
Claim 4
Dependent Claim
13 words
The compressor defined in claim 1 wherein said pistons are of different diameter.
Claim 5
Dependent Claim
18 words
The compressor defined in claim 3 wherein said guide piston has a larger diameter than said contactless piston.
Claim 6
Dependent Claim
25 words
The compressor defined in claim 1 wherein said contactless piston is provided with a metal labyrinth seal juxtaposed with the wall of the respective cylinder.
References Cited (Backward Citations)
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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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |