Mechanically operated disc brake

A mechanically operated disc brake comprising:

• a supporting member;
• a caliper slidably supported on said supporting member for sliding movement parallel to the axial direction of a disc to be braked and straddling a peripheral portion of the disc and having limbs extending along opposite sides of the disc;
• a first friction pad engaged by one of said limbs for being urged against one surface of the disc by said one limb;
• a second friction pad opposed to the first friction pad on the other side of the disc;
• the other limb of said caliper having a cavity therein, said cavity having an inner cavity facing toward said friction pads and an outer cavity facing away from said friction pads and an annular wall having an aperture therethrough partitioning the outer cavity from the inner cavity;
• a nut member rotatably mounted in the inner cavity and having means for applying thereto a rotational input force;
• means in said inner cavity engaged with said nut member for converting rotational movement of the nut member into axial movement thereof;
• a rod member on which said nut member is threaded and having an inner end abutting the second friction pad for urging said second friction pad against the disc and an outer end extending through the opening in said annular wall into said outer cavity;
• a spring retainer on said outer end of said rod member;
• a spring extending between said annular wall and said spring retainer;
• and
• a rotation control member fixed in said outer cavity contiguous to said annular wall and non-rotatably fixed therein and having at least one leg portion engaging the outer peripheral surface of said rod member for restricting the rotation thereof.