Right angle spindle for machine tools

A right angle drive attachment for milling machines and the like for advancing and retracting a rotating tool comprising,

• a power shaft having a drive gear,
• a driven shaft at a right angle to the power shaft, the driven shaft having,
• a rearward shaft portion having a gradually rotatable, uniform diameter screw extending lengthwise along the driven shaft axis, a feed nut having a threaded section adapted to engage threads of the screw and an adjacent hollow section seating an annular thrust bearing, the screw passing through the thrust bearing, the hollow section terminating in a rim engaging a collar defined at the end of a rotary, axially hollow headstock, colinear with the screw and having a peripheral lengthwise keyway, and
• a forward shaft portion comprising a fixed housing receiving the power shaft and having an axial bore with two spaced apart bearings supporting a quill axially disposed along the driven shaft axis, the rotary headstock axially extending through the quill, the quill adapted for rotary motion and seating an annular gear, meshing with the drive gear of the power shaft for receiving power therefrom, the annular gear coaxial with the quill, in rotary power transfer relation therewith, the quill constrained by the housing against axial motion, said quill having a lengthwise keyway adapted to communicate rotary power to the headstock keyway, and simultaneously permitting lengthwise bidirectional motion of the headstock along the keyway, whereby variable amounts of lengthwise motion may be transmitted to the headstock by the screw and rotary power may be simultaneously transferred to the headstock from the power shaft.