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US4018095A Expired / Lapsed US ⏱️ 0.0 years remaining

Driving device for bicycle

Assignee: Shimano Inc
•
Filing: 1976-03-29
•
Granted: 1977-04-19
•
Expires: 1996-03-29
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Abstract

Abstract A driving device for a bicycle comprises a front gear mounted to a crank, a rear gear mounted to a rear hub, and a driving chain maintained under pressure across both the front and rear gears, both the gears comprising sprocket wheels having their tooth pitches less than 12.7mm respectively and the chain having its pitch equal to or being multiples of the tooth pitch. The pitch diameter of each sprocket with respect to the number of teeth on it is reduced to make the driving device lightweight, all accelerative, and greater in transmission ratio, and to reduce the difference between the pitch diameters of both gears even with the greater transmission ratio, so that the sprocket teeth may wear less as a result of chain contact.

Inventors

  • 👤 Keizo Shimano

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 12:34
CPC Classifications
B; B62; B62M; B62M9/00; B62M9/04; B62M9/06; B62M9/10

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 89 words
A driving device for a bicycle, which comprises a front gear comprising one or more toothed sprockets mounted to a gear crank, a rear gear comprising one or more toothed sprockets mounted to a rear hub, and a driving chain stretched across said front and said rear gears, the teeth of the sprockets of the front gear and the rear gear have a pitch in the range of 8.5mm to 11.5mm respectively, and said driving chain having its pitch equal or multiples of said teeth pitch of the sprockets.
Claim 2
Dependent Claim 89 words
A driving device for a bicycle, which comprises a front gear comprising one or more toothed sprockets mounted to a gear crank, a rear gear comprising one or more toothed sprockets mounted to a rear hub, and a driving chain stretched across said front and said rear gears, the teeth of the sprockets of the front gear and the rear gear have a pitch in the range of 8.5mm to 11.5mm respectively, and said driving chain having its pitch equal or multiples of said teeth pitch of the sprockets.
Claim 3
Dependent Claim 32 words
The driving device for the bicycle according to claim 1, wherein the sprocket with the mimimum number of teeth of said rear gear has a pitch diameter of less than 49 mm.
Claim 4
Dependent Claim 87 words
The driving device for the bicycle according to claim 1, wherein the pitch of the teeth of said sprockets of both the front and rear gears is reduced by a rate of 12.7 mm minus 4.2 through 1.2 mm; the pitch diameters of the front and rear gears, with respect to the number of teeth, are reduced by said reduction rate; and the thickness of the teeth of the sprockets of the front and rear gears are reduced not proportionally to but less than said reduction rate.
Claim 5
Dependent Claim 22 words
The driving device for a bicycle according to claim 1, wherein each of said sprockets is more than 3.0 mm in thickness.
Claim 6
Dependent Claim 25 words
The driving device for a bicycle according to claim 1, wherein the teeth of each of said sprockets are less than 6 mm in height.

References Cited (Backward Citations)

US3661021A Cited
US3709053A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-04-18 1980-10-18 1981-04-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-04-18 1984-10-18 1985-04-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-04-18 1988-10-18 1989-04-19 $7700.00 Window Closed / Lapsed

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