Patent ID: 6203458
Filing Date: 2001-03-20
Classification: B23Q,F16H,Y10T

Abstract:
A speed adjusting device for a drill press which includes a motor shaft (100) and an output shaft (200), said device comprising:a first variable pulley (20) comprising two first disks (21, 22) adapted to be rotatably mounted to the motor shaft (100), each first disk (21/23) having an inclined surface (25), a spring (24) mounted to said motor shaft (100) to push said two first disks (21, 22) toward each other;a second variable pulley (30) comprising two second disks (31, 32) adapted to be rotatably mounted to the output shaft (100), each second disk (31/32) having an inclined surface (35);a belt (29) connected between said first variable pulley (20) and said second variable pulley (30);a pressing member (40) mounted to the second variable pulley (30);a fixed member (41) pivotally connected to a first end of said pressing member (40) and a control means (50) connected to a second end of said pressing member (40), said control means (50) comprising a connecting member (51) which is a chain and wrapped around a bar (53), a distal end of said chain fixedly connected to said second end of said pressing member (40), said bar (53) having a worm gear (52) connected thereto and a worm (54) engaged with said worm gear (52), said worm (54) having an indication card (56) mounted thereto and a mask (57) mounted to said indication card (56), said mask (57) having two windows (570), said indication card (56) having data marked thereon which is visible via said windows (570).