Patent US4462770A successfully refreshed from Google Patents.
US4462770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear pump with rotatable sections
Assignee: Maag Pump Systems AG
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Filing: 1983-01-31
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Granted: 1984-07-31
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Expires: 2003-01-31
Abstract
Abstract A pump housing containing an inlet and an outlet and enclosing two meshing pumping gear wheels is connected through an intermediate bearing plate to a transmission housing comprising a base arrangement and enclosing two meshing auxiliary gear wheels. An end bearing plate is disposed on the side of the transmission housing which is remote from the pump housing. The two bearing plates and the transmission housing are designed to be mutually mounted with respect to one another in four relative rotational positions, each rotated by 90° with respect to a primary axis of the gear pump. The pump housing and the intermediate bearing plate are designed to be mutually fastened to each other in two relative rotational positions, each rotated with respect to one another by 180° about the primary axis.
Inventors
- 👤 Fritz Haupt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:31
CPC Classifications
F; F04; F04C; F04C15/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
233 words
A gear pump comprising a pump housing having a pump inlet and a pump outlet; two meshing pumping gear wheels enclosed by said pump housing; a transmission housing including a base arrangement; two meshing auxiliary gear wheels enclosed in said transmission housing; said pump housing and said transmission housing defining a common primary axis; an end bearing plate disposed on a side of said transmission housing which is remote from said pump housing; an intermediate bearing plate disposed intermediate said pump housing and said transmission housing; said end bearing plate and said intermediate bearing plate as well as said transmission housing being structured to be mounted to each other in at least two relative rotational positions rotated with respect to one another by a substantially uniform angle relative to said primary axis; said pump housing and said intermediate bearing plate being structured to be mounted to each other in two relative rotational positions rotated with respect to one another by an angle of approximately 180° about said primary axis; two shafts arranged symmetrically in respect of said primary axis and rotatably journaled in said end bearing plate and in said intermediate bearing plate, one of said shafts forming a driving shaft; each of said two shafts carrying one of said two pumping gear wheels and one of said two auxiliary gear wheels; and an outwardly protruding drive stud provided at said driving shaft.
Claim 2
Dependent Claim
233 words
A gear pump comprising a pump housing having a pump inlet and a pump outlet; two meshing pumping gear wheels enclosed by said pump housing; a transmission housing including a base arrangement; two meshing auxiliary gear wheels enclosed in said transmission housing; said pump housing and said transmission housing defining a common primary axis; an end bearing plate disposed on a side of said transmission housing which is remote from said pump housing; an intermediate bearing plate disposed intermediate said pump housing and said transmission housing; said end bearing plate and said intermediate bearing plate as well as said transmission housing being structured to be mounted to each other in at least two relative rotational positions rotated with respect to one another by a substantially uniform angle relative to said primary axis; said pump housing and said intermediate bearing plate being structured to be mounted to each other in two relative rotational positions rotated with respect to one another by an angle of approximately 180° about said primary axis; two shafts arranged symmetrically in respect of said primary axis and rotatably journaled in said end bearing plate and in said intermediate bearing plate, one of said shafts forming a driving shaft; each of said two shafts carrying one of said two pumping gear wheels and one of said two auxiliary gear wheels; and an outwardly protruding drive stud provided at said driving shaft.
Claim 3
Dependent Claim
51 words
The gear pump as defined in claim 1, further including: threaded bolts for fastening said end bearing plate and said intermediate bearing plate to said transmission housing; and said threaded bolts being accessible for releasing and tightening thereof without said pump housing having to be detached from said intermediate bearing plate.
Claim 4
Dependent Claim
39 words
The gear pump as defined in claim 2, further including: threaded bolts for fastening said pump housing to said intermediate bearing plate; and said threaded bolts being releasable while said intermediate bearing plate remains fastened to said transmission housing.
Claim 5
Dependent Claim
39 words
The gear pump as defined in claim 1, further including: threaded bolts for fastening said pump housing to said intermediate bearing plate; and said threaded bolts being releasable while said intermediate bearing plate remains fastened to said transmission housing.
Claim 6
Dependent Claim
170 words
A gear pump comprising: a pump housing having a pump inlet and a pump outlet; two meshing pumping gear wheels enclosed by said pump housing; a transmission housing including a base arrangement; two meshing auxiliary gear wheels enclosed in said transmission housing; said pump housing and said transmission housing defining a common primary axis; an end bearing plate disposed on a side of said transmission housing which is remote from said pump housing; an intermediate bearing plate disposed intermediate said pump housing and said transmission housing; said end bearing plate and said intermediate bearing plate as well as said transmission housing being structured to be mounted to each other in at least two relative rotational positions rotated with respect to one another by a substantially uniform angle relative to said primary axis; and said pump housing and said intermediate bearing plate being structured to be mounted to each other in two relative rotational positions rotated with respect to one another by an angle of approximately 180° about said primary axis.
Claim 7
Dependent Claim
170 words
A gear pump comprising: a pump housing having a pump inlet and a pump outlet; two meshing pumping gear wheels enclosed by said pump housing; a transmission housing including a base arrangement; two meshing auxiliary gear wheels enclosed in said transmission housing; said pump housing and said transmission housing defining a common primary axis; an end bearing plate disposed on a side of said transmission housing which is remote from said pump housing; an intermediate bearing plate disposed intermediate said pump housing and said transmission housing; said end bearing plate and said intermediate bearing plate as well as said transmission housing being structured to be mounted to each other in at least two relative rotational positions rotated with respect to one another by a substantially uniform angle relative to said primary axis; and said pump housing and said intermediate bearing plate being structured to be mounted to each other in two relative rotational positions rotated with respect to one another by an angle of approximately 180° about said primary axis.
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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) | 1987-07-31 | 1988-01-30 | 1988-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-31 | 1992-01-30 | 1992-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-31 | 1996-01-30 | 1996-07-31 | $7700.00 | Window Closed / Lapsed |