Patent ID: 6454020
Filing Date: 2002-09-24
Classification: B25B,B25F

Abstract:
A locking device for output shaft of electric tools, comprising:a casing having a passage; a shaft rotatably received in the passage and having a polygonal distal end; a cam mounted to the output shaft and co-rotated with the output shaft, the cam having a plurality of protrusions and recesses defined between the protrusions; a plurality of brake pads each having two blocks and a protrusion extending from an inner surface of each of the brake pads, the brake pads located in the passage of the casing; a driving disk having a plurality of pawls on a first surface thereof and a width of each of the pawls being less than a distance between two blocks of each of the brake pads, a hole defined through the driving disk and the distal end of the output shaft engaged with the hole of the driving disk, two opposite sides of the hole of the driving disk each having a hill portion at an intermediate portion thereof, a plurality of concavities defined in a second surface of the driving disk and each of which receives a spring a ball therein, and a cover plate mounted to the second surface of the driving disk and a plurality of holes defined through the cover plate, the number of the holes in the cover plate being two times of the number of the concavities in the driving disk, the balls engaged with half number of the holes, the cover plate having an aperture and two opposite sides of the aperture being in alignment with two opposite sides of the hole in the driving disk.