US4392779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine drive water pump
Assignee: Brunswick Corp
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Filing: 1982-08-16
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Granted: 1983-07-12
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Expires: 2002-08-16
Abstract
Abstract Marine drives having water cooled engines utilize a water pump mounted over the drive shaft and internal to the drive shaft housing to provide engine cooling, the pump having stamped metal housing parts and a flexible impeller.
Inventors
- 👤 James L. Bloemers
- 👤 James M. Schiek
- 👤 Michael E. Frazzell
- 👤 Michael A. Karls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:24
CPC Classifications
F; F04; F04C; F04C5/00; F02; F02B; F02B61/00; F02B61/04; F02B61/045; F04C2/00; F04C2/30; F04C2/40; F04C2/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
211 words
In a marine drive having a water cooled engine rotating a drive shaft and having a cooling water intake, the improved water pump comprising: (a) a base plate mounted in said marine drive, said base plate having an eccentrically positioned drive shaft opening and a water inlet opening into the cooling water intake, (b) a cup-shaped impeller housing formed of deformed sheet metal having an end wall and a peripheral wall, said end wall having an eccentrically positioned drive shaft opening and a water outlet, (c) an impeller positioned in said impeller housing for propelling water received at said water inlet out said water outlet, said impeller having a central hub coupled to the drive shaft and a plurality of flexible impeller vanes extending outwardly from said central hub into contact with the peripheral wall of said impeller housing, and (d) a shroud formed of deformed sheet metal fitting over said impeller housing to embrace the end wall and peripheral wall of said housing, said shroud being secured to said base plate, said shroud forming an arcuate collecting chamber between the shroud and the impeller housing to connect said outlet with a water discharge opening for said pump angularly displaced from said water outlet about the axis of the drive shaft.
Claim 2
Dependent Claim
211 words
In a marine drive having a water cooled engine rotating a drive shaft and having a cooling water intake, the improved water pump comprising: (a) a base plate mounted in said marine drive, said base plate having an eccentrically positioned drive shaft opening and a water inlet opening into the cooling water intake, (b) a cup-shaped impeller housing formed of deformed sheet metal having an end wall and a peripheral wall, said end wall having an eccentrically positioned drive shaft opening and a water outlet, (c) an impeller positioned in said impeller housing for propelling water received at said water inlet out said water outlet, said impeller having a central hub coupled to the drive shaft and a plurality of flexible impeller vanes extending outwardly from said central hub into contact with the peripheral wall of said impeller housing, and (d) a shroud formed of deformed sheet metal fitting over said impeller housing to embrace the end wall and peripheral wall of said housing, said shroud being secured to said base plate, said shroud forming an arcuate collecting chamber between the shroud and the impeller housing to connect said outlet with a water discharge opening for said pump angularly displaced from said water outlet about the axis of the drive shaft.
Claim 3
Dependent Claim
29 words
The improved water pump according to claim 1 wherein said shroud abuts said base plate and wherein said pump includes sealing means between said shroud and said base plate.
Claim 4
Dependent Claim
21 words
The improved water pump according to claim 1 wherein said base plate, impeller housing, and shroud are formed of stainless steel.
Claim 5
Dependent Claim
18 words
The improved water pump according to claim 3 wherein said impeller housing has a work hardened peripheral wall.
Claim 6
Dependent Claim
88 words
The improved water pump according to claim 1 wherein said impeller vanes are dimensioned in length and width to create low flexural stresses in said impeller vanes, said length dimension being radial with respect to the drive shaft and said width dimension being normal to said length dimension and to the drive shaft; the ratio of the vane length to width being greater than 3:1 and the ratio of the inside diameter of the impeller housing to the outside diameter of the impeller hub is greater than 1.9:1.
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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |