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Hydraulic brake apparatus for bicycles

  • US 4,921,081 A
  • Filed: 12/22/1988
  • Issued: 05/01/1990
  • Est. Priority Date: 12/22/1988
  • Status: Expired due to Fees
First Claim
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1. An improved hydraulic brake apparatus for a bicycle, comprising:

  • a means for actuating said brake apparatus;

    a brake fluid reservoir;

    a fluid outlet chamber, said fluid outlet chamber oriented vertically below said brake fluid reservoir, said fluid outlet chamber comprising;

    an inlet providing fluid communication between said reservoir and said fluid outlet chamber;

    an outlet providing fluid communication between said fluid outlet chamber and a brake line, said brake line being filled with brake fluid; and

    a valve member, said valve member having a rest position and an actuated position, said valve member when in said rest position allowing flow of fluid from said brake fluid reservoir to said fluid outlet chamber through said inlet and when in said actuated position obstructing flow through said inlet;

    said inlet, outlet and valve member oriented to prevent obstruction of said outlet by said valve member;

    a master cylinder, said master cylinder in fluid communication with said brake fluid reservoir through said fluid outlet chamber, said inlet providing a single flow path between said brake fluid reservoir and said master cylinder;

    a piston, slidable within said master cylinder, said piston inducing hydraulic pressure in said fluid outlet chamber upon displacement, said actuating means causing displacement of said piston, said hydraulic pressure displacing said valve member from said rest position to said actuated position; and

    a brake means disposed proximate a wheel on said bicycle, said brake means upon actuation enforcing braking conditions on said wheel, hydraulic pressure in said brake line causing actuation of said brake means.

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