Machine tool power speed changer
OwnerRobert L. Warnke, IIIinventor
Life of this patent
Estimating the term…
Abstract
A retrofit power accessory for a turret mill provides a motor drive for changing machine tool speed, replacing a handwheel. A frame is attached to the mill by a pair of adjustable brackets which accommodate various models of mills. The frame carries a spider coupling which attaches to the rotatable machine shaft formerly holding the hand wheel. The spider coupling is driven by a gear motor on the frame through a timing belt and timing gears to positively drive the machine shaft. A manual switch controls the motor in either direction to effect the desired machine tool speed change. A rotary knob is also coupled to the spider coupling to allow manual intervention.
Claims6
A power speed changer for a machine tool wherein the machine tool has a housing and is equipped with a rotatable shaft for setting the machine speed by shaft rotation, the power speed changer comprising:
- a coupling for attachment to the rotatable shaft;
- a support frame for attachment to the machine tool housing;
- and
- power driving means on the support frame comprising:
- a reversible electric motor;
- a gear reduction output driven by the motor;
- a belt and pulley arrangement connecting the gear reduction output and the coupling for rotating the shaft upon motor operation;
- a manually operated switch for energizing the motor for selective rotation in either direction, whereby the shaft is rotated upon switch actuation for increase or decrease of machine speed;
- and
- an overload switch in circuit with the motor for opening the circuit upon excessive torque demands.
Dependencies are inferred from the claim text.