Patent US3765511A successfully refreshed from Google Patents.
US3765511A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake device for bicycles
Assignee: Bridgestone Cycle Co Ltd
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Filing: 1972-06-12
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Granted: 1973-10-16
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Expires: 1992-06-12
Abstract
Abstract This disc brake device for bicycles has steel balls inserted into cavities formed equidistant in one of two brake body portions held together by bolts to form a brake body and made in contact with one of two friction pads arranged at each side of a brake disc, and a rotatable cam made in contact with the steel balls and having projecting surfaces each formed between those surface portions of the cam which are normally in contact with the steel balls. An inner wire connected to a bicycle brake lever is connected at its free end to the cam for rotating the cam and urging the steel balls against one of the friction pads by the projecting surfaces of the cam when the brake lever is operated to pull the inner wire.
Inventors
- 👤 T Toyomasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:45
CPC Classifications
B; B62; B62L; B62L3/00; B62L3/02; F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
267 words
A disc brake device for bicycles comprising a brake disc secured to a bicycle wheel and rotatable therewith, a brake body consisting of two brake body portions held together by bolts passing through bores in said brake body portions and secured to a bicycle body, a shock absorbing resilient body inserted between said brake body and said bicycle body, each of said brake body portions being provided at its surface opposite to said brake disc with a circular depressed portion, friction pads arranged at each side of said brake disc and received in said depressed portions of said brake body portions, respectively, steel balls inserted into cavities formed equidistant in one of said brake body portions and made in contact with one of said friction pads, and a rotatable cam made in contact with said steel balls and having projecting surfaces each formed between those surface portions of said cam which are normally in contact with said steel balLs, said cam being connected through an inner wire to a brake lever of a bicycle, one of said friction pads being secured to said depressed portion of one of said brake body portions and said rotatable cam including a cam shaft passing through a center hole of said depressed portion of another brake body portion and having at its one end another friction pad secured thereto and at its free end an arm connected to one end of said inner wire, and a return spring having one end engaged with the projected portion of said cam shaft and another end engaged with one of said brake body portions.
Claim 2
Dependent Claim
267 words
A disc brake device for bicycles comprising a brake disc secured to a bicycle wheel and rotatable therewith, a brake body consisting of two brake body portions held together by bolts passing through bores in said brake body portions and secured to a bicycle body, a shock absorbing resilient body inserted between said brake body and said bicycle body, each of said brake body portions being provided at its surface opposite to said brake disc with a circular depressed portion, friction pads arranged at each side of said brake disc and received in said depressed portions of said brake body portions, respectively, steel balls inserted into cavities formed equidistant in one of said brake body portions and made in contact with one of said friction pads, and a rotatable cam made in contact with said steel balls and having projecting surfaces each formed between those surface portions of said cam which are normally in contact with said steel balLs, said cam being connected through an inner wire to a brake lever of a bicycle, one of said friction pads being secured to said depressed portion of one of said brake body portions and said rotatable cam including a cam shaft passing through a center hole of said depressed portion of another brake body portion and having at its one end another friction pad secured thereto and at its free end an arm connected to one end of said inner wire, and a return spring having one end engaged with the projected portion of said cam shaft and another end engaged with one of said brake body portions.
Claim 3
Dependent Claim
51 words
A disc brake device for bicycles as claimed in claim 1 wherein said rotatable cam includes a cam plate separated from said cam and detachably secured to said depressed portion of another brake body portion, said cam plate being made in contact with said steel balls and having said projecting surfaces.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |