US3838949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical gear pump
Assignee: Sumitomo Shipbuilding and Machinery Co Ltd
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Filing: 1973-03-15
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Granted: 1974-10-01
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Expires: 1993-03-15
Abstract
Abstract A helical gear pump provided with a cylindrical rigid casing and a resilient flexible stator member encased in said cylindrical rigid casing and having internal helical grooves of which each end of said stator member is turned up and outwardly and is engaged in a radially extending rim in which each end of said cylindrical rigid casing is tucked therein, simultaneously the outer periphery of said rim is tapered toward the end of said stator member. Thus, both ends of said cylindrical rigid casing are prevented from corrosion and materials transported through said pump may be prevented from leaking outwards of said pump.
Inventors
- 👤 K Makino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:31
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
In a helical gear pump including axially spaced, hollow intake and exhaust members supporting therebetween a stator assembly consisting of an outer cylinderical rigid casing and an inner concentrically supported resilient flexible stator, the improvement wherein: said flexible stator is axially elongated relative to said rigid casing and is provided with integral, radially outward extending rims at both ends within which the ends of said rigid casing are embedded, said intake and exhaust members are each provided with an integral flange at their ends adjacent the stator assembly, with said flanges forming internal, radial surfaces engaging respective rims, and a plurality of clamping rod and nut assemblies span the flanges of said intake and exhaust members to compress said rims between said casing and said members.
Claim 2
Dependent Claim
126 words
In a helical gear pump including axially spaced, hollow intake and exhaust members supporting therebetween a stator assembly consisting of an outer cylinderical rigid casing and an inner concentrically supported resilient flexible stator, the improvement wherein: said flexible stator is axially elongated relative to said rigid casing and is provided with integral, radially outward extending rims at both ends within which the ends of said rigid casing are embedded, said intake and exhaust members are each provided with an integral flange at their ends adjacent the stator assembly, with said flanges forming internal, radial surfaces engaging respective rims, and a plurality of clamping rod and nut assemblies span the flanges of said intake and exhaust members to compress said rims between said casing and said members.
Claim 3
Dependent Claim
50 words
A helical gear pump as claimed in claim 1, wherein the inner periphery of said flanges taper radially outward in a direction toward each other and the peripheries of said rims are respectively oppositely tapered so that each flange inner periphery fits the tapered outer periphery of the associated rim.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |