Patent US3936248A successfully refreshed from Google Patents.
US3936248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing for rotary piston engines of trochoidal construction
Assignee: Dornier GmbH
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Filing: 1974-04-01
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Granted: 1976-02-03
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Expires: 1994-04-01
Abstract
Abstract This invention relates to an improvement in a casing for a rotary piston engine of trochoidal construction with an outer envelope curve, in which radial sealing strips are mounted in the casing between the individual working chambers, the improvement comprising that the working chamber delimitation between the radial sealing strips constituting the casing is formed by a circular arc approaching the extent of the exact envelope curve, whose center is positioned on the axis of symmetry of the respective working chamber.
Inventors
- 👤 Albert Fritzsche
- 👤 Karl Jager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:27
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/08; F01C1/10; F01C1/104; F01C21/00; F01C21/10; F01C21/104; F01C21/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
In a casing for a rotary piston engine of trochoidal construction having a piston in the shape of an epitrochoid, a casing corresponding to an outer envelope curve, and individual working chambers with radial sealing strips mounted between them, the improvement comprising that the working chamber delimitation between the radial sealing strips constituting the casing is formed by a circular arc approaching the extent of the envelope curve, whose center is positioned on the axis of symmetry of the respective working chamber, said center of said circular arc being positioned between the point of intersection which results from the respective normal to the envelope curve at the end point of said envelope curve arc associated with the pertinent working chamber and the axis of symmetry of the corresponding working chamber, and the center of the envelope curve radius of curvature on the axis of symmetry of the corresponding working chamber.
Claim 2
Dependent Claim
150 words
In a casing for a rotary piston engine of trochoidal construction having a piston in the shape of an epitrochoid, a casing corresponding to an outer envelope curve, and individual working chambers with radial sealing strips mounted between them, the improvement comprising that the working chamber delimitation between the radial sealing strips constituting the casing is formed by a circular arc approaching the extent of the envelope curve, whose center is positioned on the axis of symmetry of the respective working chamber, said center of said circular arc being positioned between the point of intersection which results from the respective normal to the envelope curve at the end point of said envelope curve arc associated with the pertinent working chamber and the axis of symmetry of the corresponding working chamber, and the center of the envelope curve radius of curvature on the axis of symmetry of the corresponding working chamber.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |