Patent US3837768A successfully refreshed from Google Patents.
US3837768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear pump for highly viscous media
Assignee: Maag Gear Wheel and Machine Co Ltd
•
Filing: 1973-08-31
•
Granted: 1974-09-24
•
Expires: 1993-08-31
Abstract
Abstract A gear pump for highly viscous media includes a housing having an inlet passage at one end and a discharge passage at the opposite end and a pair of pump gears are rotatably supported within the housing and have intermeshing teeth. The inlet passage comprises an inwardly converging cone havng an angle aperture of 36* to 60* and leads centrally to the space overlying the meshing gears. On a side of the inlet passage which overlies the side of one of the gears, there is provided an additional rectangular opening or recess having a cross-section with a width substantially equal to the width of one of the gears and a length corresponding substantially to the double outside diameter of each gear wheel minus a tooth height.
Inventors
- 👤 F Haupt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:59
CPC Classifications
F; F04; F04C; F04C13/00; F04C13/001; F04C13/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A gear pump particularly for pumping highly viscous media, comprising a housing having an inlet passage at one end and a discharge passage at an opposite end, a pair of pump gears located between said inlet passage and said discharge passage having intermeshing teeth and being rotatably mounted in said housing, said inlet passage being of generally conical configuration tapering inwardly toward said pair of pump gears and having an angle aperture of from 36* to 60* and being provided with a rectangular recess with a cross-section in which the width is substantially equal to the gear wheel width and the length is substantially equal to double the outside diameter of the gears minus a tooth height.
Claim 2
Dependent Claim
117 words
A gear pump particularly for pumping highly viscous media, comprising a housing having an inlet passage at one end and a discharge passage at an opposite end, a pair of pump gears located between said inlet passage and said discharge passage having intermeshing teeth and being rotatably mounted in said housing, said inlet passage being of generally conical configuration tapering inwardly toward said pair of pump gears and having an angle aperture of from 36* to 60* and being provided with a rectangular recess with a cross-section in which the width is substantially equal to the gear wheel width and the length is substantially equal to double the outside diameter of the gears minus a tooth height.
Claim 3
Dependent Claim
35 words
A gear pump, according to claim 1, wherein the inlet diameter of said passage at its entrance end corresponds to from 2.1 to 2.3 times the center distance a between the centers of said gears.
Claim 4
Dependent Claim
93 words
A gear pump, according to claim 1, wherein said housing includes an interior wall extending in close proximity to a portion of the periphery of each gear and curving gradually outwardly therefrom on each side of said inlet passage and having a maximum width between the periphery of said gears and said passage which correspond at least to the tooth height of the gears, the length of the portion of the housing overlying the periphery of the gears defining a packing zone which corresponds at least to one tooth division of said gears.
Claim 5
Dependent Claim
20 words
A gear pump, according to claim 1, wherein the discharge passage has a diameter substantially half the maximum inlet diameter.
Claim 6
Dependent Claim
140 words
A gear pump, according to claim 1, wherein said housing is a double wall construction, an inlet conduit connected into said housing into the space between the double walls, an outlet conduit connected into said housing in the space between said double walls, said inlet and outlet conduits providing means for circulating a medium for controlling the temperature of said housing and for regulating the temperature of the medium being pumped, said inner wall defining a crescent-shaped recess extending from said inlet toward said gears, said conical housing being centered in respect to said two gears with the narrowest dimension overlying the nip over said gears, one of said gears having a shaft extending through said housing and being rotatably supported in bearings outside of said housing and being adapted to be connected to a drive for rotating said gears.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |