Patent ID: 6883648

Claim:
A mechanical disk brake for reducing speed of a bicycle in moving, comprising: a torque output assembly including an eccentric force-application arm that works with a return spring and a steel cord guiding and locating pin to create different arms of force and convert a pull force of said steel cord into a torque, and a main fixing case to which said eccentric force-application arm and many other parts and components of said disk brake are mounted at predetermined positions, so that said disk brake could be mounted on a front fork of a bicycle; a cam mechanism including a thrust bearing, a rotor-driving shaft, two rotors, and a camshaft; said rotor-driving shaft being used to push said two rotors for the same to act on a slant surface of said camshaft, so that said camshaft moves in an axial motion like a piston, and said thrust bearing being adapted to avoid a locked disk brake; a return mechanism including a leaf spring set between two axially spaced brake linings, said leaf spring providing an elastic force for said two brake linings to return to their initial position from a braked position; and a wear compensation means including a bolt that could be turned and thereby moved toward said brake linings to compensate any portion of said brake linings that has been worn off; said mechanical disk brake for a bicycle being characterized in that said rotor-driving shaft is connected to said eccentric force-application arm with a screw, such that said eccentric force-application arm converts the pull force of said steel cord into a torque to rotate said rotor-driving shaft, causing said two rotors mounted on said rotor-driving shaft to rotatably contact with said slant surface of said camshaft and thereby bring said camshaft to move in axial motion like a piston, said camshaft in axial motion being adapted to push one of said two brake linings toward the other one and thereby tightly clamp a brake disk disposed between said two brake linings to create a braking effect; and that said rotors are precisely located in two rotor locating openings on said rotor-driving shaft to enable easily controllable application of force to actuate said disk brake; wherein said eccentric force-application arm is provided along a circumferential periphery with a steel cord guide groove for receiving said steel cord therein and preventing said steel cord from moving out of said eccentric force-application arm, and at a lower portion with a screw locating hole for firmly holding a head of said steel cord therein with a screw.