US4127368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for eccentric helical gear pump
Assignee: Individual
•
Filing: 1974-07-22
•
Granted: 1978-11-28
•
Expires: 1994-07-22
Abstract
Abstract A rotor for an eccentric gear pump is formed of two deep-drawn sheet metal halves welded together.
Inventors
- 👤 Paul G. Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:19
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/084; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49242; Y10T29/49826; Y10T29/49893
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A tempered and turned or ground hollow eccentric helical rotor for an eccentric helical gear pump comprising two deep formed matching eccentric helical rotor half-shells having a relatively thin wall thickness and having a high impact strength and abrasive resistance, said half-shells being secured together by a weld at two opposite weld lines extending along the course of the midline of said rotor and having a circular plate secured to each end by a weld and a tube stub secured by a weld to one of said circular plates, said stub being aligned with the axis of said rotor.
Claim 2
Dependent Claim
99 words
A tempered and turned or ground hollow eccentric helical rotor for an eccentric helical gear pump comprising two deep formed matching eccentric helical rotor half-shells having a relatively thin wall thickness and having a high impact strength and abrasive resistance, said half-shells being secured together by a weld at two opposite weld lines extending along the course of the midline of said rotor and having a circular plate secured to each end by a weld and a tube stub secured by a weld to one of said circular plates, said stub being aligned with the axis of said rotor.
Claim 3
Independent Claim
85 words
A method of manufacturing a rotor for an eccentric helical gear pump, comprising: deep forming two matching eccentric helical rotor half shells made from relatively thin sheet metal; fastening said half shells together by welding; welding a circular plate to each end of the formed rotor; welding a tube stub to one of said circular plates, said stub being aligned with the axis of the rotor; turning or grinding to correct for weld seam or half shell defects; and tempering the turned or ground rotor.
Claim 4
Independent Claim
85 words
A method of manufacturing a rotor for an eccentric helical gear pump, comprising: deep forming two matching eccentric helical rotor half shells made from relatively thin sheet metal; fastening said half shells together by welding; welding a circular plate to each end of the formed rotor; welding a tube stub to one of said circular plates, said stub being aligned with the axis of the rotor; turning or grinding to correct for weld seam or half shell defects; and tempering the turned or ground rotor.
References Cited (Backward Citations)
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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) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |