US3608683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bicycle hub having a built-in three-stage speed change mechanism and equipped with a coaster brake
Assignee: Shimano Inc
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Filing: 1969-08-22
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Granted: 1971-09-28
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Expires: 1989-08-22
Abstract
Abstract This invention relates to a bicycle hub having a built-in threestage speed change mechanism, wherein rotation of a driving drum is imparted through separate pawl and ratchet means to an annulus or driven member and to a planet carrier supporting a plurality of planet pinions, and the pawl and ratchet means between said driving drum and said annulus is adapted to impart both forward and backward rotations of the driving drum to the annulus, the mechanism being so improved that the invention exhibits practical effects such as a simple construction, a less trouble and so on.
Inventors
- 👤 Kentaro Fujisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:39
CPC Classifications
B; B62; B62M; B62M11/00; B62M11/04; B62M11/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
290 words
A bicycle hub having a built-in three-stage speed change mechanism and equipped with a coaster brake, comprising: a. a hub shell having a right-hand extension, b. a rear dead axle, c. a driviNg sleeve or drum having an inner extension and rotatably mounted on said dead axle near the right-hand extension of said hub shell, d. a rotatable sprocket wheel securely mounted on said driving drum, e. a planetary gear mechanism including a planet carrier, an orbit gear, and a sun gear on said dead axle, f. changeover means including a ring bushing slidably and rotatably mounted on said dead axle, g. jaw clutch for high gear operatively connecting the driving drum and the planet carrier, being adapted to be tripped by the ring bushing upon axial movement thereof to a predetermined position, h. a pawl and ratchet means for normal and low gears drivingly connecting the driving drum and the orbit gear during driving, being adapted to be tripped upon a reverse motion of the driving drum, i. a pawl and ratchet means operatively connecting the driving drum and the orbit gear during braking thereby to effect brake engagement, said means being adapted to be tripped upon a forward motion of the driving drum, j. a pawl and ratchet means for high and normal gears operatively connecting the orbit gear and the hub shell, being adapted to be tripped by the ring bushing upon axial movement thereof to a predetermined position, k. a pawl and ratchet means for low gear operatively connecting the planet carrier and the hub shell, and l. said coaster brake including a brake frame mounted on the planet carrier and adapted to be moved axially responsive to actuation upon reverse rotation of the planet carrier.
Claim 2
Dependent Claim
290 words
A bicycle hub having a built-in three-stage speed change mechanism and equipped with a coaster brake, comprising: a. a hub shell having a right-hand extension, b. a rear dead axle, c. a driviNg sleeve or drum having an inner extension and rotatably mounted on said dead axle near the right-hand extension of said hub shell, d. a rotatable sprocket wheel securely mounted on said driving drum, e. a planetary gear mechanism including a planet carrier, an orbit gear, and a sun gear on said dead axle, f. changeover means including a ring bushing slidably and rotatably mounted on said dead axle, g. jaw clutch for high gear operatively connecting the driving drum and the planet carrier, being adapted to be tripped by the ring bushing upon axial movement thereof to a predetermined position, h. a pawl and ratchet means for normal and low gears drivingly connecting the driving drum and the orbit gear during driving, being adapted to be tripped upon a reverse motion of the driving drum, i. a pawl and ratchet means operatively connecting the driving drum and the orbit gear during braking thereby to effect brake engagement, said means being adapted to be tripped upon a forward motion of the driving drum, j. a pawl and ratchet means for high and normal gears operatively connecting the orbit gear and the hub shell, being adapted to be tripped by the ring bushing upon axial movement thereof to a predetermined position, k. a pawl and ratchet means for low gear operatively connecting the planet carrier and the hub shell, and l. said coaster brake including a brake frame mounted on the planet carrier and adapted to be moved axially responsive to actuation upon reverse rotation of the planet carrier.
Claim 3
Dependent Claim
33 words
The bicycle hub of claim 1, comprising control ring means surrounding the orbit gear and actuatable for simultaneously retracting the driving pawls of said pawl and ratchet means for high and normal gears.
Claim 4
Dependent Claim
49 words
The bicycle hub of claim 1, wherein the pawls of said pawl and ratchet means for low gear are mounted on an intermediate ring encircling a threaded sleeve of said planet carrier in a manner as to be rotated integral with the planet carrier upon a forward motion thereof.
Claim 5
Dependent Claim
54 words
The bicycle hub of claim 1, wherein the heel of each pawl of said pawl and ratchet means for normal and low gears is formed as a pawl for said reverse braking pawl and ratchet means, and the ratchets of both means are formed in one piece, thereby effecting a simplification of the mechanism.
Claim 6
Dependent Claim
92 words
The bicycle hub of claim 3, wherein the intermediate ring is provided with projections axially extending toward the brake frame and engageable for normal rotation with respective holes formed in the brake frame, said intermediate ring and said brake frame being adapted to have a slight clearance therebetween during driving in any speed transmission condition, thereby to prevent an excessively tight engagement of the brake frame with the intermediate ring during driving and enable the brake frame to be readily moved axially responsive to actuation upon reverse rotation of the planet carrier.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |