| 摘要 |
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.
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