Patent ID: 6322298
Filing Date: 2001-11-27
Classification: B23G,B23Q,Y10T

Abstract:
A tapping apparatus, for tapping a workpiece with a tap, adapted to use with a movable member of a working machine, said movable member adapted to be displaced together with the workpiece; the tapping apparatus comprising:(a) a drive unit including a drive output shaft;(b) a rotation transmission cable coupled to the drive output shaft; and(c) a tapping unit comprising:a housing, including an hermetically sealed interior, removably secured to the movable member of the working machine;an input shaft rotatably supported via a first bearing within the interior of said housing, said input shaft including an input shaft first end protruding outwardly from said housing, said input shaft first end being coupled to the drive output shaft of the drive unit by way of the rotation transmission cable;an input shaft second end being fixedly secured, within said housing, to a driving bevel gear;a driven bevel gear meshed with said driving bevel gear and rotatably supported via a second bearing at a fixed location within said housing;a spindle rotating jointly and coaxially with said driven bevel gear, said spindle being coupled to said driven bevel gear in such a manner as to allow a relative displacement in an axial direction;said spindle including a spindle first end protruding outwardly from said housing and including a spindle chuck adapted for holding the tap;said spindle including an interior portion being disposed at all times within the interior of said housing, said interior portion including an externally threaded spindle portion formed on an outer periphery thereof; anda master metal fixedly secured to the interior of said housing, said master metal including an internally threaded portion mating with said externally threaded spindle portion of said spindle.