Threading apparatus for milling machines
OwnerHarold L. Christyinventor
Life of this patent
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Abstract
Threading apparatus for a vertical milling machine includes a threaded sleeve at the upper portion of a milling machine draw bar and a split nut thread guide secured to the top of the milling machine and about the upper portion of the draw bar. When the split nut engages the threads on the draw bar, rotation of the draw bar causes the draw bar to move vertically in response to the mating threads of the sleeve and the split nut so that a thread cutting tool on the opposite end of the draw bar will cut threads in a work piece. By changing sleeves and split nuts, virtually any pitch thread may be cut.
Claims16
Threading apparatus for single point threading by vertical milling machines having a head and a rotatable drawbar extending through the head, comprising, in combination:
- a base plate securable to the head;
- first arm means pivotally secured to the base plate;
- second arm means pivotally secured to the base plate;
- lead screw means securable to the drawbar and rotatable therewith and having threads corresponding to the desired threads to be cut;
- threaded nut means secured to the first and second arm means and pivotal therewith to engage the threads of the lead screw means to cause the lead screw means and the drawbar to move vertically in accordance with the pitch of the threads on the lead screw means and the threaded nut means as the drawbar rotates, and to disengage the lead screw means to cause the drawbar to cease vertical movement;
- and
- means for pivoting the first and second arm means to engage and to disengage the threaded nut means and the lead screw means.
Dependencies are inferred from the claim text.