Patent US961966A successfully refreshed from Google Patents.
US3662887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil pump inlet strainer
Assignee: Ripley Screen and Strainer Co
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Filing: 1970-01-21
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Granted: 1972-05-16
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Expires: 1990-01-21
Abstract
Abstract A sump immersed pump inlet strainer in which a metal casing connected to a pump inlet has a circular inflow opening with a straining screen extending across the opening and peripherally retained in the opening with the screen having a central crimped protrusion extending outwardly and holding a metal plate in place in blocking relationship with respect to an aperture in the screen so that movement of the screen from an outwardly bowed position with respect to the inflow opening to an inwardly bowed position due to clogging of the screen and pump suction on the interior of the casing will release the plate to permit oil flow inwardly through the then unblocked aperture.
Inventors
- 👤 Walker S Uhlhorn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:12
CPC Classifications
F; F01; F01M; F01M11/00; B; B01; B01D; B01D29/00; B01D29/01; B01D29/96; B01D35/00; B01D35/02; B01D35/027; B01D35/0273; B01D35/14; B01D35/147
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
195 words
A sump immersed oil pump inlet strainer comprising a rigid intake casing defining a hollow inflor chamber, means connecting said hollow chamber to an oil pump inlet, straining screen means peripherally restrained in and extending across an inflow opening in said casing, said straining screen being positioned in a first position in which it is normally bowed outwardly with respect to said inflow opening but being capable of being bowed inwardly in a second position with respect to said inflow opening, an aperture in said screen, said screen including a supporting portion supporting and retaining an aperture blocking member in said aperture on the side of said screen opposite said inflow opening when said screen is bowed outwardly in its first position and for releasing said aperture blocking member from said screen for inward movement into said casing away from the screen in response to movement of said screen to its inwardly bowed position whereby upon clogging of said screen, suction on the interior of said chamber will move the screen inwardly so that said aperture blocking member will be released and oil can then flow into the chamber via the aperture in said screen.
Claim 2
Dependent Claim
195 words
A sump immersed oil pump inlet strainer comprising a rigid intake casing defining a hollow inflor chamber, means connecting said hollow chamber to an oil pump inlet, straining screen means peripherally restrained in and extending across an inflow opening in said casing, said straining screen being positioned in a first position in which it is normally bowed outwardly with respect to said inflow opening but being capable of being bowed inwardly in a second position with respect to said inflow opening, an aperture in said screen, said screen including a supporting portion supporting and retaining an aperture blocking member in said aperture on the side of said screen opposite said inflow opening when said screen is bowed outwardly in its first position and for releasing said aperture blocking member from said screen for inward movement into said casing away from the screen in response to movement of said screen to its inwardly bowed position whereby upon clogging of said screen, suction on the interior of said chamber will move the screen inwardly so that said aperture blocking member will be released and oil can then flow into the chamber via the aperture in said screen.
Claim 3
Dependent Claim
14 words
The invention of claim 1 wherein said aperture blocking member comprises a disc-like plate.
Claim 4
Dependent Claim
163 words
The invention of claim 2 wherein said supporting portion supporting and retaining said aperture blocking member in said aperture comprises a centrally oriented crimped protrusion of said screen extending outwardly from the screen and the inflow opening to define a generally conical surface symmetrical with respect to the axis of said aperture in said screen, a radially inwardly extending rim flange defining the outermost extent of said protrusion portion whereby said disc-like plate is retained between the conical surface and the rim flange when the screen is in its outwardly bowed position by virtue of the fact that the apex of the conical surface is inwardly of the screen but the plate is released upon movement of the screen to its inwardly bowed position by virtue of reorientation of the conical surface to a shape in which a second conical surface with an apex outwardly of the screen is formed and the disc-like plate is consequently free to move inwardly within the chamber.
Claim 5
Dependent Claim
169 words
The invention of claim 2 wherein said supporting portion supporting and retaining said aperture blocking member in said aperture comprises a centrally oriented crimped protrusion of said screen extending outwardly from the screen and the inflow opening and having a side wall encircling and engaging the periphery of the aperture blocking member and terminating in a radially inwardly extending rim flange with the inner periphery of said rim flange defining said aperture with said aperture blocking member being adjacent and engageable with the rim flange and with the said side wall overlying the aperture blocking member to retain the aperture blocking member in position adjacent the flange when the screen is in its outwardly bowed position whereby movement of the screen to its inwardly bowed position opens up the side wall of the protrusion so that it no longer overlies said aperture blocking member and the aperture blocking member is consequently free to move inwardly into the casing to permit oil to flow through said aperture in said screen.
Claim 6
Dependent Claim
16 words
The invention of claim 4 wherein said inflow opening and said screen are circular in shape.
Claim 7
Dependent Claim
16 words
The invention of claim 2 wherein said inflow opening and said screen are circular in shape.
Claim 8
Dependent Claim
168 words
The invention of claim 6 wherein said supporting portion supporting and retaining said aperture blocking member in said aperture comprises a centrally oriented crimped protrusion of said screen extending outwardly from the screen and the inflow opening and having a side wall encircling and engaging the periphery of the aperture blocking member and terminating in a radially extending rim flange with the inner periphery of said rim flange defining said aperture with said aperture blocking member being adjacent and engageable with the rim flange and with the said side wall overlying the aperture blocking member to retain the aperture blocking member in position adjacent the flange when the screen is in its outwardly bowed position whereby movement of the screen to its inwardly bowed position opens up the side wall of the protrusion so that it no longer overlies said aperture blocking member and the aperture blocking member is consequently free to move inwardly into the casing to permit oil to flow through said aperture in said screen.
Claim 9
Dependent Claim
19 words
The invention of claim 7 wherein said disc-like plate is circular and said aperture in said screen is circular.
Claim 10
Dependent Claim
56 words
The invention of claim 2 wherein said means connecting said hollow chamber to said oil pump inlet comprises a hollow conduit extending inwardly into said casing and having a notched opening on its end within said casing so that said disc-like plate cannot block said opening upon movement of said disc-like plate inwardly into said casing.
Claim 11
Dependent Claim
169 words
The invention of claim 9 wherein said supporting portion supporting and retaining said aperture blocking member in said aperture comprises a centrally oriented crimped protrusion of said screen extending outwardly from the screen and the inflow opening and having a side wall encircling and engaging the periphery of the aperture blocking member and terminating in a radially inwardly extending rim flange with the inner periphery of said rim flange defining said aperture with said aperture blocking member being adjacent and engageable with the rim flange and with the said side wall overlying the aperture blocking member to retain the aperture blocking member in position adjacent the flange when the screen is in its outwardly bowed position whereby movement of the screen to its inwardly bowed position opens up the side wall of the protrusion so that it no longer overlies said aperture blocking member and the aperture blocking member is consequently free to move inwardly into the casing to permit oil to flow through said aperture in said screen.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |