公开(公告)号：US4796319A

公开(公告)日：1989-01-10

申请号：US60654

申请日：1987-06-11

Applicant: David Taft

Inventor： David Taft

IPC: B25B21/00 ,  B25F3/00

CPC classification number: B25F3/00 ,  B25B21/007 ,  Y10T408/9065

Abstract: A drill accessory kit for mounting screw-type fasteners is comprised of several drill bit holders and a screwdriving attachment. The bit holder engages a common twist drill bit in the chuck of a drill and allows one to drill a pilot hole to a desired depth in a workpiece with a cutting action which provides a proper-shaped hole for clean flush mounting or countersinking of a screw. Subsequently, the screwdriver attachment slips over the drill bit and engages with the bit holder, allowing a quick change from drilling to powerdriving of a screw.

Abstract translation: 用于安装螺丝式紧固件的钻头附件套件包括多个钻头夹头和螺丝刀附件。 钻头保持器与钻头的卡盘中的公共麻将钻头接合，并且允许人们用切削动作将导向孔钻到工件的期望深度，该切削动作提供适当形状的孔，用于清洁冲洗安装或锪孔螺钉 。 随后，螺丝刀连接件滑过钻头并与钻头夹持器接合，允许从钻孔到螺杆动力驱动的快速更换。