公开(公告)号：US3583822A

公开(公告)日：1971-06-08

申请号：US3583822D

申请日：1968-10-31

Applicant: ROCKWELL MFG CO

Inventor： ALEXANDER ROBERT H ,  BROOM WALTER F ,  BOATWRIGHT DAVID ANTHONY ,  THACKSTON CLYDE DAVID

IPC: B23B45/00 ,  B23B45/04 ,  B23B47/18 ,  B23B47/22 ,  B23Q5/32 ,  B23Q5/34 ,  B23Q5/40 ,  B23Q11/04 ,  B25H1/00 ,  B23B45/14 ,  B23B47/24

CPC classification number: B25H1/0021 ,  B23B45/008 ,  B23B45/04 ,  B23Q5/326 ,  B23Q5/348 ,  B23Q5/402 ,  B23Q11/04 ,  Y10T74/173 ,  Y10T408/172 ,  Y10T408/23 ,  Y10T408/6793

Abstract: A portable tool incorporates a motor having a shaft connected through a gear train to drive a gear slidably mounted on a spindle having an external thread and movable axially in a direction normal to the axis of the motor shaft. A feed gear having internal threads is mounted on the spindle and is selectively driven at a first speed to produce positive feed of the spindle and at a second speed to effect rapid advancement of the spindle. Collars are adjustably mounted on the spindle and are effective to provide precise depth control and automatic disengagement of the positive feed and retraction of the spindle.