Patent US3892166A successfully refreshed from Google Patents.
US3892166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston and cylinder apparatus arranged for cleaning
Assignee: Alfa Laval AB
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Filing: 1973-06-12
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Granted: 1975-07-01
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Expires: 1993-06-12
Abstract
Abstract The cylinder has at least one opening on each side of the piston, these openings serving as inlet and outlet for a liquid; and at each end position of the piston, the cylinder has an annular zone in which the internal diameter of the cylinder along a substantial part of its periphery is larger than the diameter of annular seals on opposite ends of the piston. These annular zones of the cylinder communicate with respective cylinder openings and are located so that when the piston is in either end position, the piston seal nearest the corresponding cylinder end is opposite the corresponding zone while the other piston seal is in sealing engagement with the inside of the cylinder, whereby the seals can be effectively flushed with cleaning liquid without disassembling the piston-cylinder combination.
Inventors
- 👤 Bjorn-Olow Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:49
CPC Classifications
B; B65; B65B; B65B3/00; B65B3/26; B65B3/30; B65B3/32; F; F15; F15B; F15B21/00; F15B21/04; F15B21/044; G; G01; G01F; G01F11/00; G01F11/02; G01F11/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
Apparatus comprising a cylinder, a piston adapted to reciprocate in the cylinder between two end positions and having an annular seal at each end of the piston, whereby said seals are interposed between interior portions of the cylinder on opposite sides of the piston, the cylinder having at least one opening on each side of the piston, said openings serving as inlet and outlet for liquid, and means for controlling the flow of liquid into and out of the cylinder through said openings, the inside of the cylinder having at each end position of the piston an annular zone in which the internal diameter of the cylinder along a substantial part of its periphery is larger than the outer diameter of said annular seals, said zones communicating with respective cylinder openings and being located so that when the piston is in each end position, the piston seal nearest the corresponding cylinder end is opposite the corresponding zone while the other piston seal is in sealing engagement with the inside of the cylinder.
Claim 2
Dependent Claim
172 words
Apparatus comprising a cylinder, a piston adapted to reciprocate in the cylinder between two end positions and having an annular seal at each end of the piston, whereby said seals are interposed between interior portions of the cylinder on opposite sides of the piston, the cylinder having at least one opening on each side of the piston, said openings serving as inlet and outlet for liquid, and means for controlling the flow of liquid into and out of the cylinder through said openings, the inside of the cylinder having at each end position of the piston an annular zone in which the internal diameter of the cylinder along a substantial part of its periphery is larger than the outer diameter of said annular seals, said zones communicating with respective cylinder openings and being located so that when the piston is in each end position, the piston seal nearest the corresponding cylinder end is opposite the corresponding zone while the other piston seal is in sealing engagement with the inside of the cylinder.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, in which the cylinder has annular recesses forming said zones.
Claim 4
Dependent Claim
16 words
The apparatus of claim 2, in which said cylinder openings are located in the annular recesses.
Claim 5
Dependent Claim
61 words
The apparatus of claim 1, in which the axis of the cylinder forms an angle with the horizontal, the piston having at least one recess between its said seals, said recess and each of said cylinder zones having an axial extension such that the piston recess comes into communication with said zones as the piston arrives at its respective end positions.
Claim 6
Dependent Claim
30 words
The apparatus of claim 4, in which the piston has a plurality of said recesses extending in the axial direction of the cylinder and distributed evenly around the piston''s periphery.
Claim 7
Dependent Claim
78 words
The apparatus of claim 1, in which said cylinder openings include a separate inlet and a separate outlet on each side of the piston, said means including a valve in each of said inlets and outlets and being operable, when the piston is in either end position, to maintain the inlet and outlet open on the side of the piston adjacent said end position while maintaining the inlet and outlet on the other side of the piston closed.
Claim 8
Dependent Claim
12 words
The apparatus of claim 1, in which said means are valve means.
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |