Cutting apparatus and vertical drive mechanism therefor

Details Cutting apparatus and vertical drive mechanism therefor Cutting apparatus and vertical drive mechanism therefor

1977-12-19

1979-11-27

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

With work-engaging structure other than tool or tool-support

Frictionally engaging sides of opening in work

408131, 173145, 409199, 409143, B23C 120

Patent

active

041754719

ABSTRACT:
A cutting apparatus with a vertical drive mechanism for in place machining f a valve seat which may include an annular turntable adapted to be rotatably mounted on the valve above the valve seat. A feed shaft is mounted through the turntable so as to be rotatable therewith, and a bottom of the feed shaft is adapted to receive a cutter for machining the valve seat. The vertical drive mechanism is mounted on the feed shaft and includes a nut threaded in the feed shaft and a gear combination. The gear combination may include a first portion which is fixedly connected to the nut, a second portion which operatively engages the first gear portion, and a third portion which operatively engages the second gear portion, the third gear portion being mounted for rotatable slidable friction engagement about the nut. With this arrangement, rotation of the turntable causes the vertical drive mechanism to rotate therewith as a unit, however, upon stopping the third gear portion, the latter will rotate relative to the turntable and the remainder of the vertical drive mechanism to turn the second gear portion, then the first gear portion, then the nut, then drive the feed shaft vertically.

REFERENCES:
patent: 2777339 (1957-01-01), Hess
patent: 3640147 (1972-02-01), Fantoni

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