US3707335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water pump
Assignee: King Seeley Thermos Co
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Filing: 1971-01-25
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Granted: 1972-12-26
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Expires: 1991-01-25
Abstract
Abstract A water pump for a commercial ice maker comprising a high capacity pump with a relatively large water flow rate and having an improved seal for sealing a motor shaft where it enters the pump chamber to avoid substantial leakage and resulting loss in pumping pressure.
Inventors
- 👤 Walter C Barnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:02
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/106; F04D29/40; F04D29/42; F04D29/426; F25; F25C; F25C1/00; F25C1/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
297 words
A water pump for a commercial ice maker, comprising: a rigid plastic pump housing having a water inlet, a water outlet and an impeller chamber; a rotatable shaft extending into said chamber; an impeller in said chamber for rotation by said shaft to develop a water pressure in said chamber; means forming a shaft seal chamber adjacent said pump chamber integral with said housing having a radial outer wall through which said shaft extends, an annular seal retainer of rigid plastic fixed against rotation in said seal chamber having an opening of limited larger diameter than said shaft through which said shaft extends, said retainer having an inner surface adjacent said impeller and an outer surface spaced axially inwardly from said seal chamber outer wall; and a one-piece annular floating shaft seal of rigid plastic located between said retainer outer surface and said seal chamber outer wall and having a radial inner surface subjected to water pressure from said impeller and an axial opening through which said shaft extends, said shaft seal defining a frustoconical, axially outwardly widening, axially outer surface about said opening, said opening being defined by a cylindrical shaft engaging surface extending axially outwardly from said inner surface of the seal less than one-half the axial thickness of said seal, said shaft seal having a thickness less than the distance between said retainer outer surface and said seal chamber wall and said seal chamber being defined radially outwardly by an annular surface, said shaft seal having an outer periphery spaced radially inwardly from said annular surface so as to float with respect to said seal chamber outer wall, said retainer outer surface and said annular surface of said seal chamber, and said pump housing, retainer, and seal being formed of the same plastic material.
Claim 2
Dependent Claim
297 words
A water pump for a commercial ice maker, comprising: a rigid plastic pump housing having a water inlet, a water outlet and an impeller chamber; a rotatable shaft extending into said chamber; an impeller in said chamber for rotation by said shaft to develop a water pressure in said chamber; means forming a shaft seal chamber adjacent said pump chamber integral with said housing having a radial outer wall through which said shaft extends, an annular seal retainer of rigid plastic fixed against rotation in said seal chamber having an opening of limited larger diameter than said shaft through which said shaft extends, said retainer having an inner surface adjacent said impeller and an outer surface spaced axially inwardly from said seal chamber outer wall; and a one-piece annular floating shaft seal of rigid plastic located between said retainer outer surface and said seal chamber outer wall and having a radial inner surface subjected to water pressure from said impeller and an axial opening through which said shaft extends, said shaft seal defining a frustoconical, axially outwardly widening, axially outer surface about said opening, said opening being defined by a cylindrical shaft engaging surface extending axially outwardly from said inner surface of the seal less than one-half the axial thickness of said seal, said shaft seal having a thickness less than the distance between said retainer outer surface and said seal chamber wall and said seal chamber being defined radially outwardly by an annular surface, said shaft seal having an outer periphery spaced radially inwardly from said annular surface so as to float with respect to said seal chamber outer wall, said retainer outer surface and said annular surface of said seal chamber, and said pump housing, retainer, and seal being formed of the same plastic material.
Claim 3
Dependent Claim
31 words
The pump of claim 1 wherein said rigid shaft seal has an axial thickness less than one-half the radial thickness thereof and is tapered inwardly to said shaft engaging surface thereof.
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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |