US3813708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kitchen sink strainer and drain bowl unit
Assignee: Admiral Marine Products Co
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Filing: 1972-12-29
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Granted: 1974-06-04
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Expires: 1992-12-29
Abstract
Abstract A drain bowl, fastened within the drain opening of a kitchen sink, is provided with a keyhole slot type opening through its bottom, with a wedge shaped cam formed around the opening on the bottom surface of the drain bowl. A bowl-shaped strainer is nested within the drain bowl and has an integral central stem extending downwardly through the hole with a radial projection engaged with the cam beneath the drain bowl bottom to seal the strainer downwardly against the drain bowl interior wall. A coil spring surrounding the stem and engaged between the bottom of the strainer and the interior surface of the bottom of the drain bowl, forces the strainer upwardly for spacing the strainer from the drain bowl, for drainage therebetween, when the strainer is rotated to disengage the projection from the cam.
Inventors
- 👤 J Hamburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:21
CPC Classifications
A; A47; A47K; A47K1/00; A47K1/14; E; E03; E03C; E03C1/00; E03C1/12; E03C1/26; E03C1/262
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
179 words
A kitchen sink strainer and drain bowl unit comprising: a drain bowl formed for fixed securement within the drain opening of a kitchen sink, for connection of said drain opening to a drain pipe, and a bowl shaped strainer loosely nested within the drain bowl; an elongated hole formed through the center of the bottom of the bowl; a downwardly extending stem having its upper end secured to the bottom of the strainer and its lower end portion slidably and rotatably fitted through said hole; a radial projection formed on the lower end portion of the stem and of a size for slidably fitting through a portion of said hole and then against the drain bowl bottom surface edge portion defining the hole, upon rotation of the stem, for thereby sealing the strainer against the interior wall of the drain bowl and for releasing upon counter-rotation; and a spring means mounted between the strainer and drain bowl for spring lifting and holding the strainer raised relative to the drain bowl, for drainage therebetween, upon release of the stem projection.
Claim 2
Dependent Claim
179 words
A kitchen sink strainer and drain bowl unit comprising: a drain bowl formed for fixed securement within the drain opening of a kitchen sink, for connection of said drain opening to a drain pipe, and a bowl shaped strainer loosely nested within the drain bowl; an elongated hole formed through the center of the bottom of the bowl; a downwardly extending stem having its upper end secured to the bottom of the strainer and its lower end portion slidably and rotatably fitted through said hole; a radial projection formed on the lower end portion of the stem and of a size for slidably fitting through a portion of said hole and then against the drain bowl bottom surface edge portion defining the hole, upon rotation of the stem, for thereby sealing the strainer against the interior wall of the drain bowl and for releasing upon counter-rotation; and a spring means mounted between the strainer and drain bowl for spring lifting and holding the strainer raised relative to the drain bowl, for drainage therebetween, upon release of the stem projection.
Claim 3
Dependent Claim
56 words
A construction as defined in claim 1, and said spring means comprising a coil spring encircling the stem between the projection and bottom of the strainer, and the lower end of the spring bearing against the interior surface of the bowl for providing a spring force between the bowl and the strainer for urging them apart.
Claim 4
Dependent Claim
75 words
A construction as defined in claim 1, and said hole being of a keyhole slot configuration, and said projection formed as a short, radially outwardly directed member attached to the stem and of a size to pass through the elongated portion of said hole; and a wedge shaped surface formed upon the bottom of the bowl adjacent said hole, for downwardly camming engagement with said member, for thus pulling the strainer downwardly against the bowl.
Claim 5
Dependent Claim
55 words
A construction as defined in claim 3, and said spring means comprising a coil spring encircling the stem and with the opposite ends of the spring respectively abutted against the bottom of the strainer and the interior of the mold bottom for providing a spring force normally urging the strainer upwardly away from the bowl.
Claim 6
Dependent Claim
60 words
A constRuction as defined in claim 1, and said drain bowl interior wall having an annular shaped downwardly and inwardly tapered sealing surface formed therein, and a correspondingly tapered annular edge formed on the bottom of the strainer for face to face sealing contact with the bowl sealing surface for thereby forming the seal between the strainer and drain bowl.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |