Patent US4730981A successfully refreshed from Google Patents.
US4730981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling fan
Assignee: Suiden KK
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Filing: 1986-07-17
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Granted: 1988-03-15
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Expires: 2006-07-17
Abstract
Abstract A ceiling fan adapted for use in factories and office buildings, the ceiling fan including flapping vanes capable of vertically flapping during rotation, the double movement of the vanes being effective to stir and circulate the air in the room in a wide range. To effect the flapping of the vanes no wire or elevating members are used unlike the prior ceiling fan having flapping vanes.
Inventors
- 👤 Yuzo Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:39
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
A ceiling fan having flapping vanes, the ceiling fan comprising: a motor casing accommodating a motor; a worm shaft fixed to the motor casing; a motor shaft means rotatively passed through the worm shaft to drive said worm shaft and to also rotatingly drive the fan; a gear box having a boss through which the driving shaft is passed; a driver gear provided in the gear box, the gear being connected to the driving shaft through a bevel gearing on the worm shaft; a follower gear train including a plurality of follower spur gear means engageable with the driver gear; a number of crank rod means corresponding to the number of flapping vanes, the crank rod means being pivotally connected to the correspondingly selected number of follower gear means for reciprocating movement in a substantially horizontal plane; and flapping vanes rotatively connected to the crank rods so that the vanes flap in accordance with the substantially horizontal reciprocal movement of the crank rods.
Claim 2
Dependent Claim
163 words
A ceiling fan having flapping vanes, the ceiling fan comprising: a motor casing accommodating a motor; a worm shaft fixed to the motor casing; a motor shaft means rotatively passed through the worm shaft to drive said worm shaft and to also rotatingly drive the fan; a gear box having a boss through which the driving shaft is passed; a driver gear provided in the gear box, the gear being connected to the driving shaft through a bevel gearing on the worm shaft; a follower gear train including a plurality of follower spur gear means engageable with the driver gear; a number of crank rod means corresponding to the number of flapping vanes, the crank rod means being pivotally connected to the correspondingly selected number of follower gear means for reciprocating movement in a substantially horizontal plane; and flapping vanes rotatively connected to the crank rods so that the vanes flap in accordance with the substantially horizontal reciprocal movement of the crank rods.
Claim 3
Dependent Claim
30 words
A ceiling fan as defined in claim 1, wherein the crank rod means are eccentrically fixed to the respective gears through crank pins to provide the substantially horizontal reciprocal movement.
Claim 4
Dependent Claim
26 words
A ceiling fan as defined in claim 1, wherein the spur gears means rotate about an axis parallel to the rotation axis of the motor shaft.
Claim 5
Dependent Claim
26 words
A ceiling fan as defined in claim 2, wherein the spur gears means rotate about an axis parallel to the rotation axis of the motor shaft.
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |