Lead screw tapping unit

Details Lead screw tapping unit Lead screw tapping unit

1977-04-04

1978-09-19

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

With randomly-actuated stopping means

Responsive to condition of tool or tool-drive

408137, 10135R, B23G 116, B23B 4727

Patent

active

041150252

ABSTRACT:
A lead screw tapping unit is disclosed wherein a tap or thread forming die is mountable on a tool support spindle which is longitudinally movable with a nonrotatable quill. The spindle is rotatably driven by a reversible drive motor and has a lead screw carried thereon which cooperates with a lead nut to effect controlled inward feeding and withdrawal of the tap relative to a workpiece. The lead nut carries a cam bushing which is operative to actuate a safety switch and deenergize a drive motor to stop rotation of the spindle should the spindle and tap undergo a thrust overload condition, or if seizure occurs between the lead screw and lead nut.

REFERENCES:
patent: 2165396 (1939-07-01), Mansfield
patent: 3690782 (1972-09-01), Petroff
patent: 3838934 (1974-10-01), Petroff

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