Patent US3594102A successfully refreshed from Google Patents.
US3594102A
Expired / Lapsed
US
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Water pump impeller having electrical insulation and corrosion-preventative features
Assignee: HOFFINGER INDUSTRIES Inc
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Filing: 1969-08-11
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Granted: 1971-07-20
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Expires: 1989-08-11
Abstract
Abstract An impeller for rotary water pumps and the like which through the provision of novel components and combinative relations with the driving shaft of an electric motor, inherently accomplishes two important new results, to wit: 1. The housing of the pump and all water passing therethrough are dielectrically insulated from the metal driving element of the motor. 2. The motor shaft, from its terminal point to an area outside of the pump housing, is entirely enclosed within a protruding sleeve carried by the impeller, thus preventing accumulation of rust or other corrosion as well as eliminating electrolytic buildup on the motor shaft.
Inventors
- 👤 William A Oden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:10
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/2205; F04D29/2222; F04D29/2227; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F05; F05B; F05B2240/00; F05B2240/70; F05D; F05D2300/00; F05D2300/40; F05D2300/43; F05D2300/50; Y; Y10; Y10S; Y10S277/00; Y10S277/919
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
In use with a liquid pump housing having a generally central liquid chamber, an intake, a discharge, and an axial bore at one end for accommodating a rotary driving shaft and a mechanical annular seal assembly, a rotary impeller having blades mounted in said liquid chamber and having a back bodyplate provided with a rigid axial portion constructed wholly of electrical insulating material, said axial portion having rigidly connected thereto and sealed therewith a rearwardly protruding, coaxial protective sleeve constructed also of electrical insulating material, said sleeve snugly surrounding the end of said driving shaft throughout said bore and having adjacent its inner end and in conjunction with said rigid axial portion, means for drive connection of the end of said driving shaft with said impeller.
Claim 2
Dependent Claim
126 words
In use with a liquid pump housing having a generally central liquid chamber, an intake, a discharge, and an axial bore at one end for accommodating a rotary driving shaft and a mechanical annular seal assembly, a rotary impeller having blades mounted in said liquid chamber and having a back bodyplate provided with a rigid axial portion constructed wholly of electrical insulating material, said axial portion having rigidly connected thereto and sealed therewith a rearwardly protruding, coaxial protective sleeve constructed also of electrical insulating material, said sleeve snugly surrounding the end of said driving shaft throughout said bore and having adjacent its inner end and in conjunction with said rigid axial portion, means for drive connection of the end of said driving shaft with said impeller.
Claim 3
Dependent Claim
29 words
The structure set forth in claim 1 wherein, said axial portion of said bodyplate and said sleeve are integrally constructed of a hard plastic material having electrical insulating properties.
Claim 4
Dependent Claim
68 words
The structure and combination set forth in claim 1 wherein, said axial portion also has rigidly connected thereto and sealed therewith a rearwardly protruding annular seal-receiving flange, constructed also of electrical insulating material, extending coaxial with said protective sleeve but of substantially less length, said sleeve having an internal cylindrical surface and said mechanical seal assembly at its forward portion being held and disposed beneath said annular flange.
Claim 5
Dependent Claim
31 words
The structure and combination set forth in preceding claim 3 wherein, said back bodyplate, said axial portion, said sleeve and said annular flange are all integrally constructed of electrical insulating material.
References Cited (Backward Citations)
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |