US3744180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller drive mechanism for a model airplane
Assignee: Mabuchi Motor Co Ltd
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Filing: 1971-12-02
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Granted: 1973-07-10
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Expires: 1991-12-02
Abstract
Abstract A propeller drive mechanism for a model airplane is disclosed, wherein a guide plate with guide grooves is rotatably mounted on a shaft in coupling with an output shaft of a drive motor, and clutch pins are fitted into the guide grooves so that the clutch pins may be protruded under the effect of centrifugal force. A clutch member to which a propeller is secured has shoulders for engaging with the clutch pins in their protruded position to receive drive force and a cam face for rendering the clutch pins inoperative to the clutch member.
Inventors
- 👤 K Mabuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:55
CPC Classifications
A; A63; A63H; A63H27/00; A63H27/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A propeller driving mechanism for a model airplane, comprising: a motor; a shaft mounted to the model airplane for rotation; A gear wheel fixedly mounted to said shaft, means operably connecting said gear wheel and said motor such that said shaft is driven by said motor; a guide plate mounted to said shaft adjacent said gear wheel, said guide plate including oppositely disposed grooves extending outwardly from said shaft to the outer periphery of said guide plate; clutch pins slidably mounted within said grooves; and a sleeve operably mounted for rotation about a portion of said shaft, a propeller fixedly mounted to said sleeve, a clutch member formed as a part of said sleeve, said clutch member being provided with a cavity within which said guide plate fits, said cavity comprising opposed cam faces interrupted by opposed shoulders such that as said motor drives said shaft said clutch pins move outwardly under the influence of centrifugal force engaging and locking with said shoulders of said clutch member causing said sleeve and propeller to rotate.
Claim 2
Dependent Claim
174 words
A propeller driving mechanism for a model airplane, comprising: a motor; a shaft mounted to the model airplane for rotation; A gear wheel fixedly mounted to said shaft, means operably connecting said gear wheel and said motor such that said shaft is driven by said motor; a guide plate mounted to said shaft adjacent said gear wheel, said guide plate including oppositely disposed grooves extending outwardly from said shaft to the outer periphery of said guide plate; clutch pins slidably mounted within said grooves; and a sleeve operably mounted for rotation about a portion of said shaft, a propeller fixedly mounted to said sleeve, a clutch member formed as a part of said sleeve, said clutch member being provided with a cavity within which said guide plate fits, said cavity comprising opposed cam faces interrupted by opposed shoulders such that as said motor drives said shaft said clutch pins move outwardly under the influence of centrifugal force engaging and locking with said shoulders of said clutch member causing said sleeve and propeller to rotate.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |