Patent US3661480A successfully refreshed from Google Patents.
US3661480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for gear pumps or motors
Assignee: Robert Bosch GmbH
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Filing: 1969-12-30
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Granted: 1972-05-09
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Expires: 1989-12-30
Abstract
Abstract A section of an extrusion profile constitutes a housing especially for use for accomodating a gear pump or motor. The housing has a substantially cylindrical outer contour and a substantially oval cross section and an inner chamber which constitutes at least one longitudinal cylinder having at least one open end and surface lines which extend parallel with the surface lines of the outer contour and perpendicular to the original line threads or flow lines of the extrusion profile section so as to improve the fatigue resistance and especially the tensile fatigue resistance of the housing.
Inventors
- 👤 Friedrich Forschner
- 👤 Hans Kurzhals
- 👤 Karl-Heinz Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:38
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/086; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49242; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
An article of manufacture, a housing particularly for gear pumps or gear motors, said housing comprising a metal shell having an internal flow line structure in which the flow lines extend substantially in one direction, said shell having an outer peripheral surface and an inner peripheral surface bounding an inner cavity of said housing and open at least at one end thereof, the generatrices of said surfaces extending transversely to said flow lines.
Claim 2
Dependent Claim
73 words
An article of manufacture, a housing particularly for gear pumps or gear motors, said housing comprising a metal shell having an internal flow line structure in which the flow lines extend substantially in one direction, said shell having an outer peripheral surface and an inner peripheral surface bounding an inner cavity of said housing and open at least at one end thereof, the generatrices of said surfaces extending transversely to said flow lines.
Claim 3
Dependent Claim
42 words
A novel article as defined in claim 1, wherein said inner cavity comprises a substantially cylindrical surface of non-circular cross section having a major and a minor axis with one of said axes coincident with the original direction of said flow lines.
Claim 4
Dependent Claim
16 words
A novel article as defined in claim 2, wherein said one axis is the major axis.
Claim 5
Dependent Claim
16 words
A novel article as defined in claim 2, wherein said one axis is the minor axis.
Claim 6
Dependent Claim
18 words
A novel article as defined in claim 2, wherein said cross section of said housing is substantially oval.
Claim 7
Independent Claim
78 words
A method of making a housing, particularly for gear pumps or gear motors, comprising the steps of, extruding an elongated bar of material characteristic; forming in said bar an interval cavity having an inner peripheral surface, and forming at the exterior of said bar an outer peripheral surface of desired contour, with the generatrices of both of said surfaces extending transversely to the elongation of said bar and thereby to the original direction of extrusion of said bar.
Claim 8
Independent Claim
78 words
A method of making a housing, particularly for gear pumps or gear motors, comprising the steps of, extruding an elongated bar of material characteristic; forming in said bar an interval cavity having an inner peripheral surface, and forming at the exterior of said bar an outer peripheral surface of desired contour, with the generatrices of both of said surfaces extending transversely to the elongation of said bar and thereby to the original direction of extrusion of said bar.
Claim 9
Dependent Claim
49 words
A method as defined in claim 6, wherein the step of forming said outer peripheral surface comprises exerting pressure on the outer side of said bar in direction normal to said elongation to thereby deform the material of said bar to the shape of the desired outer peripheral surface.
Claim 10
Dependent Claim
16 words
A method as defined in claim 7, wherein said inner cavity is formed by removing material.
Claim 11
Dependent Claim
16 words
A method as defined in claim 7, wherein said inner cavity is formed by pressure-displacing material.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |