Patent ID: 6398678
Filing Date: 2002-06-04
Classification: B23Q,F16H,Y10T

Abstract:
A speed adjusting device for a drill, comprising:a motor having a motor shaft and a first pulley assembly mounted to said motor shaft, said first pulley assembly comprising a first fixed disk and a first movable disk, said first fixed disk fixedly connected to said motor shaft and said first movable disk movably mounted to said motor shaft, each of said first fixed disk and said first movable disk having an inclined surface facing each other, a spring biased between said first movable disk and said motor; a second pulley assembly comprising a second fixed disk and a second movable disk, said second fixed disk fixedly mounted to a driving shaft and said second movable disk movably mounted to said driving shaft, each of second fixed disk and said second movable disk having an inclined surface facing each other, an output shaft connected to said driving shaft, a belt movably engaged between said first fixed disk and said first movable disk, and between said second fixed disk and said second movable disk, and a pressing member having a first end which has a fork portion, a frame having a block connected thereto and said block being pivotally connected between two legs of said fork portion, a second end of said pressing member pressing on said second movable disk, a lifting means connected to said pressing member.