US3901627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spinner assembly for model airplanes
Assignee: PERFECT PARTS COMPANY
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Filing: 1974-07-17
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Granted: 1975-08-26
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Expires: 1994-07-17
Abstract
Abstract A spinner assembly is provided for model airplanes which is particularly suited for engagement by a starter motor for starting the airplane engine. In order to reduce the stress and strain on the nose cap and propeller resulting from the use of starter motors, the inner surface of the nose cap is provided with a cylindrical flange for frictionally engaging the shoulder portion of the inner of two nuts which holds the propeller on the propeller shaft. In this manner some of the torque or rotational force imparted by the starter motor is transmitted to the propeller shaft through the stronger portions of the nose cap instead of through the weaker outer periphery of the nose cap and the propeller itself. The nose cap is preferably fastened to the propeller shaft and tightened against the shoulder of the inner or first nut by means of a screw through the apex of the nose cap and into the cap of a second or lock nut which secures the propeller on the shaft.
Inventors
- 👤 Matthew A Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:20
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/34; A; A63; A63H; A63H27/00; A63H27/02; B; B64; B64C; B64C11/00; B64C11/02; B64C11/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
In a spinner assembly for attachment to a threaded propeller shaft of a model airplane comprising a propeller having hub and blade portions, a generally conical, hollow nose cap, and first and second threaded nuts for fastening said propeller to said threaded shaft, said first threaded nut abutting against said propeller hub and said second threaded nut abutting against the opposite side of said first nut from said propeller hub, the improvement comprising flange means extending from the interior surface of said nose cap and shoulder means on said first threaded nut, said flange means frictionally engaging said shoulder means when said nose cap is in operating position.
Claim 2
Dependent Claim
108 words
In a spinner assembly for attachment to a threaded propeller shaft of a model airplane comprising a propeller having hub and blade portions, a generally conical, hollow nose cap, and first and second threaded nuts for fastening said propeller to said threaded shaft, said first threaded nut abutting against said propeller hub and said second threaded nut abutting against the opposite side of said first nut from said propeller hub, the improvement comprising flange means extending from the interior surface of said nose cap and shoulder means on said first threaded nut, said flange means frictionally engaging said shoulder means when said nose cap is in operating position.
Claim 3
Dependent Claim
25 words
Apparatus according to claim 1 wherein said flange means comprises a cylindrical wall, said cylindrical wall extending parallel to the axis of said threaded shaft.
Claim 4
Dependent Claim
48 words
Apparatus according to claim 2 wherein said shoulder means comprises first and second flanges extending from said first threaded nut, said first flange extending radially to the axis of said threaded shaft and said second flange extending from said first flange and generally parallel to said cylindrical wall.
Claim 5
Dependent Claim
22 words
Apparatus according to claim 3 wherein said first and second flanges extend substantially around the entire circumference of said first threaded nut.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 3 wherein the outer circumference of said second flange is in frictional engagement with the inner surface of said cylindrical wall.
Claim 7
Dependent Claim
35 words
Apparatus according to claim 3 wherein the end of said cylindrical wall remote from the inner surface of said nose cap frictionally engages the surface of said first flange from which said second flange extends.
Claim 8
Dependent Claim
33 words
Apparatus according to claim 1 wherein said second threaded nut is a cap nut, said cap nut having aperture means in the cap portion thereof for receiving fastening means from said nose cap.
Claim 9
Dependent Claim
20 words
Apparatus according to claim 7 wherein said nose cap has aperture means in the apex thereof for receiving fastening means.
Claim 10
Dependent Claim
43 words
Apparatus according to claim 8 wherein said nose cap is fastened to said propeller shaft by screw means extending through said aperture means in said nose cap and into threaded engagement with said aperture means in the cap portion of said cap nut.
Claim 11
Dependent Claim
23 words
Apparatus according to claim 9 wherein said flange means is forced into frictional engagement with said shoulder means by tightening said screw means.
Claim 12
Dependent Claim
30 words
Apparatus according to claim 1 wherein said nose cap is provided with cut out portions whereby said blade portions of said propeller pass through the walls of said nose cap.
Claim 13
Dependent Claim
24 words
Apparatus according to claim 11 wherein said cut out portions comprise notches in the walls of said nose cap remote from the apex thereof.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |