Patent US3680663A successfully refreshed from Google Patents.
US3680663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk brake for a bicycle
Assignee: Shimano Inc
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Filing: 1970-07-13
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Granted: 1972-08-01
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Expires: 1990-07-13
Abstract
Abstract A brake disk rotatable in synchronism with a wheel and arranged adjacent a bicycle frame to which a pair of brake arms constituting a force doubling mechanism substantially operable by a single lever are mounted to be swung at both sides of said brake disk, said brake arms being provided in one end with a pair of brake shoes and in the other end with a link device constituting a force doubling mechanism substantially operable by a toggle joint, and said link device being operable by wire rope means in the manner of securing the most reliable and effective braking contact of said brake shoes upon the brake disk with light manipulation touch.
Inventors
- 👤 Masayoshi Kine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:40
CPC Classifications
B; B62; B62L; B62L1/00; B62L3/00; B62L3/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A disk brake for a bicycle comprising a brake disk fixedly mounted to a wheel of said bicycle and rotated therewith, said disk comprising a pair of opposed, parallel frictional engagement surfaces, a pair of brake arms pivotally mounted to a frame of said bicycle, actuating means engaging each of said brake arms at one end thereof to simultaneously rotate said arms in an opposed manner about their respective pivotal mountings, a pair of brake shoe elements including brake shoe surfaces for frictionally engaging said brake disk surfaces, each of said brake shoe elements being pivotally mounted upon one of said brake arms at an end thereof opposite said actuating means, and guide means engaging each of said brake shoe elements and extending directly therebetween for insuring that said brake shoe elements move with said brake shoe surfaces maintained parallel to said brake disk frictional engagement surfaces when said brake arms are actuated to engage said disk brake.
Claim 2
Dependent Claim
158 words
A disk brake for a bicycle comprising a brake disk fixedly mounted to a wheel of said bicycle and rotated therewith, said disk comprising a pair of opposed, parallel frictional engagement surfaces, a pair of brake arms pivotally mounted to a frame of said bicycle, actuating means engaging each of said brake arms at one end thereof to simultaneously rotate said arms in an opposed manner about their respective pivotal mountings, a pair of brake shoe elements including brake shoe surfaces for frictionally engaging said brake disk surfaces, each of said brake shoe elements being pivotally mounted upon one of said brake arms at an end thereof opposite said actuating means, and guide means engaging each of said brake shoe elements and extending directly therebetween for insuring that said brake shoe elements move with said brake shoe surfaces maintained parallel to said brake disk frictional engagement surfaces when said brake arms are actuated to engage said disk brake.
Claim 3
Dependent Claim
37 words
A disk brake according to claim 1, wherein said guide means comprise a pin mounted to extend between said brake shoe elements, with at least one of said brake shoe elements being movable relative to said pin.
Claim 4
Dependent Claim
26 words
A disk brake according to claim 2, wherein said pin is fixed to one of said brake shoe elements and movably mounted relative to the other.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |