초록 ▼

A bicycle brake device for increasing the braking power to be applied to the wheel of a bicycle which has caliper type brake arms mounted on the seat stay bridge by a bolt about which the caliper arms are pivotally movable. A cage is mounted on the ends of the caliper arms and has an open end and a

A bicycle brake device for increasing the braking power to be applied to the wheel of a bicycle which has caliper type brake arms mounted on the seat stay bridge by a bolt about which the caliper arms are pivotally movable. A cage is mounted on the ends of the caliper arms and has an open end and a closed end. A brake shoe is slidably carried for axial movement in the cage through the open end and has a front end and a rear end oriented with the open and closed end respectively of the cage. A brake block is carried in the brake shoe and has a surface for engaging the rim to apply friction forces for braking action. A cam is mounted at the front end of the brake shoe for engaging the seat stay upon forward sliding movement of the brake shoe in the cage as a result of friction forces between the brake block and the rim when the block engages the rim. A threaded bolt projects from the rear end of the brake shoe and protrudes through an opening in the closed end of the cage, a spring being coiled about the protruding bolt for returning the brake shoe to its initial position after the cam has engaged the seat stay.

대표청구항 ▼

A bicycle brake device having increased braking power to be applied to the wheel rim of a bicycle, comprising a pair of caliper type brake arms mounted to the seat stay bridge of the seat stay of a bicycle body by an attaching bolt for pivotal movement of said arms about said bolt so that the ends t

A bicycle brake device having increased braking power to be applied to the wheel rim of a bicycle, comprising a pair of caliper type brake arms mounted to the seat stay bridge of the seat stay of a bicycle body by an attaching bolt for pivotal movement of said arms about said bolt so that the ends thereof are movable toward and away from said bicycle wheel rim for applying braking pressure to said rim, a cage mounted on the ends of said caliper arms by a brake shoe pin and nut, said cage being open at one end thereof and closed at the other end thereof, a brake shoe slidably carried for axial movement in said cage through said open end thereof, said brake shoe having a front end and a rear end oriented with said open end and closed end respectively of said cage, the forward rotation of said wheel being in a direction from said rear end of said brake shoe toward said front end thereof, a brake block carried in said brake shoe having a surface for engaging said rim to apply friction forces thereto for braking action, a wedge shaped cam mounted at said front end of said brake shoe for engaging said seat stay upon forward sliding movement of said brake shoe in said cage as a result of friction forces between said brake block and said rim when said brake block engages said rim, so that when said wedge shaped cam engages said seat stay a component of a reaction force urges said brake block against the wheel rim with increased pressing power to increase braking power, a threaded bolt projecting from said rear end of said brake shoe and protruding through an opening in said closed end of said cage, and a spring coiled about said bolt between said cage and means on said bike for returning said brake shoe to its initial position after said cam has engaged said seat stay.