US3659568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinders for air-cooled reciprocable piston internal combustion engines
Assignee: Kloeckner Humboldt Deutz AG
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Filing: 1970-12-08
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Granted: 1972-05-02
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Expires: 1990-12-08
Abstract
Abstract In an air-cooled reciprocable piston engine having at least two adjacent cylinders with parallel longitudinal axes and transverse fins, in which adjacent fin portions of two adjacent cylinders are provided with straight substantially parallel edges defining therebetween a narrow gap while the ends of said straight edges merge by curved portions curved in the direction toward the axis of the pertaining cylinder with the segment-shaped remainder of the pertaining fins, tie rod means being located between adjacent curved portions of respectively pertaining fins of two adjacent cylinders.
Inventors
- 👤 Hans-Ulrich Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:16
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/02; F02F1/04; F02F1/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
In an air-cooled reciprocable piston engine with crank case: two cylinders having their longitudinal axes arranged parallel to each other and respectively being provided with transverse fins extending around the respective cylinder, those parts of at least somE of said fins which respectively pertain to said two cylinders and are located adjacent to and opposite each other having substantially straight edge portions extending at a substantially right angle with regard to the plane passing through the said parallel axes of said two cylinders, said straight edge portions defining with each other a relatively narrow gap, each end of each straight edge portion of each fin merging with a relatively large rounded portion of the same fin through a relatively short curved portion curved inwardly toward the interior of the pertaining cylinder, and tie rod means common to and arranged between two adjacent ones of said inwardly curved portions for tieing said cylinders to their cylinder heads and the crank case pertaining thereto.
Claim 2
Dependent Claim
162 words
In an air-cooled reciprocable piston engine with crank case: two cylinders having their longitudinal axes arranged parallel to each other and respectively being provided with transverse fins extending around the respective cylinder, those parts of at least somE of said fins which respectively pertain to said two cylinders and are located adjacent to and opposite each other having substantially straight edge portions extending at a substantially right angle with regard to the plane passing through the said parallel axes of said two cylinders, said straight edge portions defining with each other a relatively narrow gap, each end of each straight edge portion of each fin merging with a relatively large rounded portion of the same fin through a relatively short curved portion curved inwardly toward the interior of the pertaining cylinder, and tie rod means common to and arranged between two adjacent ones of said inwardly curved portions for tieing said cylinders to their cylinder heads and the crank case pertaining thereto.
Claim 3
Dependent Claim
23 words
An arrangement according to claim 1, in which said relatively short curved portions within the region of said tie rod means are pre-cast.
Claim 4
Dependent Claim
24 words
An arrangement according to claim 1, in which the depth of said relatively short curved portion is rather slight with regard to its width.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |