US3772932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-speed transmission free wheel for a bicycle
Assignee: Individual
•
Filing: 1971-08-13
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Granted: 1973-11-20
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Expires: 1991-08-13
Abstract
Abstract In a multi-speed transmission free wheel to be provided on a wheel hub rotatably mounted on a wheel shaft of a bicycle are included a plurality of sprocket wheels respectively having a different number of teeth. Each tooth of said sprocket wheels has its peripheral portion that faces to a lowest speed transmission sprocket wheel and is notched in a manner that the foremost end thereof is deviated toward a highest speed transmitting sprocket wheel so that when the driving chain to be driven by treading the pedals, the shifting operation can be effected smoothly and exactly despite of a big difference in tooth number between said two sprocket wheels.
Inventors
- 👤 M Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:04
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
203 words
A multispeed transmission free wheel for a bicycle to be mounted on a wheel hub rotatably supported on a wheel shaft comprising a. a driven member secured to one end of said free wheel and rotatable along with said free wheel; b. a cylindrically shaped driving member sleeved on the outer periphery of said driven member at regularly spaced apart intervals, and rotatable in one direction with respect to said driven member while being rotatable in the other direction integrally therewith; c. a driving force transmitting mechanism for transmitting the force of said driving member in the space between said driven member and said driving member; and d. a plurality of different dent numbered sprocket wheels rigidly fixed on the outer periphery of said driving member at regularly spaced apart intervals, comprising addenda of each sprocket wheel opposed to a greater dent-numbered lower speed sprocket wheel are cut aslant from the outer periphery toward the radius thereof so as to form a flank face deviated toward a less dent-numbered, higher speed sprocket wheel, further said addenda being cut at a right angle with the axis thereof so as to form each flat surface area defining a notched portion with said deviated flank face.
Claim 2
Dependent Claim
203 words
A multispeed transmission free wheel for a bicycle to be mounted on a wheel hub rotatably supported on a wheel shaft comprising a. a driven member secured to one end of said free wheel and rotatable along with said free wheel; b. a cylindrically shaped driving member sleeved on the outer periphery of said driven member at regularly spaced apart intervals, and rotatable in one direction with respect to said driven member while being rotatable in the other direction integrally therewith; c. a driving force transmitting mechanism for transmitting the force of said driving member in the space between said driven member and said driving member; and d. a plurality of different dent numbered sprocket wheels rigidly fixed on the outer periphery of said driving member at regularly spaced apart intervals, comprising addenda of each sprocket wheel opposed to a greater dent-numbered lower speed sprocket wheel are cut aslant from the outer periphery toward the radius thereof so as to form a flank face deviated toward a less dent-numbered, higher speed sprocket wheel, further said addenda being cut at a right angle with the axis thereof so as to form each flat surface area defining a notched portion with said deviated flank face.
Claim 3
Dependent Claim
38 words
The arrangement of claim 1, wherein at least one of the sprocket wheels between the highest and lowest speed sprocket wheels is provided with dents whose addenda are formed as set forth in item (d) of claim 1.
Claim 4
Dependent Claim
34 words
The arrangement of claim 2, wherein the addenda of said maximum dent-numbered, lowest speed sprocket wheel opposing to higher speed sprocket wheels are cut aslant with respect to the axis of said sprocket wheel.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |