Patent US4706306A successfully refreshed from Google Patents.
US4706306A
Expired / Lapsed
US
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Sink strainer with bridged stem
Assignee: Individual
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Filing: 1987-03-09
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Granted: 1987-11-17
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Expires: 2007-03-09
Abstract
Abstract A stopper drain guide stem is provided for centering and positioning a stopper in a drain guide hole. The unitary guide stem has a spindle portion extending axially downwardly therefrom for attachment to a drain stopper. The downwardly extending flexible stem portion of the guide element has a radiused nose portion for supporting the drain stopper in its raised, draining position, and for centering the stem and guiding it into a central aperture of the drain body assembly. The intermediate length of the stem portion is bifurcated, having a pair of spaced apart, substantially parallel flexible leg portions with a flexible spacer member extending therebetween intermediate their length, to promote flexibility of the stem, so as to enable its use in a wider range of sizes of guide hole, and to enhance lateral stabilizing frictional engagement of the stem with the inner peripheral surface of the drain guide hole. The improved guide element can be used with a simple stopper having a stopper washer, or with a sink stopper including a perforated strainer basket. The enhanced flexbility of the legs enabling use in combination with a wider range of sizes of sink guide holes promotes the value and utility of the invention to the aftermarket.
Inventors
- 👤 Ronald A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:59
CPC Classifications
E; E03; E03C; E03C1/00; E03C1/12; E03C1/26; E03C1/262; A; A47; A47K; A47K1/00; A47K1/08; A47K1/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A unitary stem for use with a drain stopper for a fixture, said stem having an upper spindle portion including attachment means for securing the stem to said stopper, an intermediate flange extending transversely of the stem and a lower hollow stem portion bounded by leg portions extending downwardly, having a radiused nose portion at the lower end junction thereof, said legs being transversely flexible intermediate their ends, in use, during insertion and withdrawal of the stem from a guidance aperture of a drain housing, and spring means extending across said hollow stem portion in joining relation with said leg portions intermediate their ends, to resist transverse compressive deformation of said leg portions on passage thereof through said guidance aperture.
Claim 2
Dependent Claim
120 words
A unitary stem for use with a drain stopper for a fixture, said stem having an upper spindle portion including attachment means for securing the stem to said stopper, an intermediate flange extending transversely of the stem and a lower hollow stem portion bounded by leg portions extending downwardly, having a radiused nose portion at the lower end junction thereof, said legs being transversely flexible intermediate their ends, in use, during insertion and withdrawal of the stem from a guidance aperture of a drain housing, and spring means extending across said hollow stem portion in joining relation with said leg portions intermediate their ends, to resist transverse compressive deformation of said leg portions on passage thereof through said guidance aperture.
Claim 3
Dependent Claim
28 words
The stem as set forth in claim 1, in combination with said drain stopper said attachment means detachably securing said stopper and said stem in mutually secured relation.
Claim 4
Dependent Claim
48 words
The combination as set forth in claim 2, the ends of said spring means forming a pair of junctions with said leg portions, said radiused nose portion supporting said stem in centered relation in said guidance aperture when said drain stopper is in a first, raised, unstopped position.
Claim 5
Dependent Claim
53 words
The stem as set forth in claim 1, in combination with said drain stopper and with a strainer basket, said attachment means detachably securing said stopper, said strainer basket and said stem in mutually secured relation, having said stopper and said stem in depending relation beneath a lower face of said strainer basket.
Claim 6
Dependent Claim
28 words
The combination as set forth in claim 3, said junctions being located above said guidance aperture when said drain stopper is in said second, fully depressed stoppering position.
Claim 7
Dependent Claim
29 words
The stem as set forth in claim 2, said attachment means consisting of a threaded spindle portion and a handle portion having an internal thread removeably engaging said stem.
Claim 8
Dependent Claim
41 words
The stem as set forth in claim 1, said leg portions having a cross section profile in which the radially outer surface thereof is an arc of a circle, to provide an extended contact surface with said drain housing guidance aperture.
Claim 9
Dependent Claim
70 words
The stem as set forth in claim 1, in combination with said stopper, said hollow stem promoting precise centering and axial positional stability between said stopper and said drain housing aperture, when said stopper is in a first, raised condition, and when said stopper is in a second, fully inserted condition, to facilitate the elective location of said stopper in either a raised draining position or an inserted, stoppering position.
Claim 10
Dependent Claim
177 words
A sink strainer, comprising a strainer basket and, attached to the basket, a stem which protrudes downwards below the basket for insertion within a guidance aperture in a drain housing; where the stem is a single unitary flat moulding of plastic material having substantially constant thickness throughout its length, and includes a through-slot that extends through the thickness of said stem and partway along its axial length, so as to define an undivided body portion and a divided body portion thereof; where said divided portion has two legs, one on either side of said through-slot; where said through-slot does not extend to the bottom of said plastic stem, so that said legs are joined by a bridging portion at the bottom of said plastic stem; where said legs are flexibly resilient and deflectable towards each other, said through-slot being wide enough to permit such deflection; where the outside profile of at least said bottom bridging portion includes a pair of radiused nose portions to facilitate entry of said legs in compressed inserted relation within said guidance aperture.
Claim 11
Dependent Claim
177 words
A sink strainer, comprising a strainer basket and, attached to the basket, a stem which protrudes downwards below the basket for insertion within a guidance aperture in a drain housing; where the stem is a single unitary flat moulding of plastic material having substantially constant thickness throughout its length, and includes a through-slot that extends through the thickness of said stem and partway along its axial length, so as to define an undivided body portion and a divided body portion thereof; where said divided portion has two legs, one on either side of said through-slot; where said through-slot does not extend to the bottom of said plastic stem, so that said legs are joined by a bridging portion at the bottom of said plastic stem; where said legs are flexibly resilient and deflectable towards each other, said through-slot being wide enough to permit such deflection; where the outside profile of at least said bottom bridging portion includes a pair of radiused nose portions to facilitate entry of said legs in compressed inserted relation within said guidance aperture.
Claim 12
Dependent Claim
31 words
The strainer as set forth in claim 9, said legs being deformed inwardly by said guidance aperture, when in use, to protrude above and below said aperture, in gripping relation therewith.
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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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |