TODAY’S PATENT – DISC BRAKE
This invention “Disc brake” was invented by Kanji Ishihara and assigned to Tokico Ltd, was granted patent on 5th May, 1981 by the USPTO bearing patent grant number US4265339A to the patentee. This invention relates to advancements in disc brakes, specifically those where friction pads are applied to opposing faces of a rotatable disc by pistons operating in opposing hydraulic cylinders in a fixed calliper that spans a section of the disc.
The disc brake shown has a calliper A made up of two complementary members 1 and 2. The calliper member 1 has a limb that contains a hydraulic cylinder, and the hydraulic cylinder receives a piston. Similarly, the calliper member 2 has a limb with a hydraulic cylinder that accepts a piston. Between the piston and the rotatable disc is a friction pad, and between the piston and the disc is a friction pad. The friction pads and are held in place on the calliper by one or more, preferably two, pins that extend between the limbs of calliper members 1 and 2. Caliper members 1 and 2 are formed by casting or similar methods and have a generally similar configuration.