Drill speeder for machine tools
AssigneeKearney & Trecker Corporation
InventorMorris L. Hutchens
Life of this patent
Estimating the term…
Abstract
An electric motor driven drill and a battery therefor are mounted within a toolholder for a machine tool. The battery is coupled to the motor through a centrifugal switch which closes when the toolholder is rotated about its axis above a predetermined speed and opens when the rotary speed of the toolholder falls below the predetermined speed. The toolholder is mounted in the spindle of a machine tool and the drill turns on when the spindle is rotated and turns off when the spindle stops, the rotary speed of the spindle being added to the rotary speed of the drill in one direction of spindle rotation and subtracted from the rotary speed of the drill in the opposite direction of spindle rotation.
Claims6
A drill speeder for a machine tool having a spindle, means on said spindle for receiving a toolholder and clamping said toolholder therein, and means for rotating the spindle about its axis, comprising:
- a toolholder adapted to be clamped in said spindle and rotated thereby;
- a drill chuck rotatably mounted on said toolholder coaxial with the axis thereof;
- an electric motor mounted within said toolholder and coupled to said drill chuck to drive the drill chuck;
- a battery mounted within said toolholder;
- a switch mounted within said toolholder;
- and
- means coupling said battery, said motor, and said switch in series so that said motor is turned on when said switch closes and is turned off when said switch opens.
Dependencies are inferred from the claim text.