Patent ID: 8043030
Filing Date: 2011-10-25
Classification: B23B,B23C,B23D,Y10T

Abstract:
1. A drill holder being configured to hold a drill with a conical shank and a threaded hole in a conical shank during drilling, said drill holder comprising: a longitudinal axis; a front end comprising a conical receptacle portion being configured to receive a drill with a conical shank; a rear end being disposed opposite to said front end and being configured to be inserted into a machine; a threaded screw being configured to engage a threaded hole in a conical shank of a drill; a threaded axial hole being disposed in the longitudinal center of said drill holder and being configured and disposed to receive said threaded screw; said threaded screw comprising a multi-sided hole in an end facing away from said front end of said drill holder; an access opening being disposed at an acute angle with respect to the longitudinal axis; an adjusting tool being configured to enter said access opening comprising: said threaded screw and said threaded axial hole of said drill holder and the threaded hole of a drill with a conical shank and a threaded hole in a conical shank each comprising threading having a thread pitch to provide sufficient mechanical advantage to turn said threaded screw in said axial hole and in a drill with a conical shank and a threaded hole in a conical shank to tighten the drill into said conical receptacle portion of said drill holder; the acute angle of said access opening being sufficiently large to permit manual adjustment of said adjusting tool by the hand of a user; and the acute angle of said access opening being sufficiently small to permit said substantially ball-shaped head structure of said adjusting tool to enter said access opening and to engage and turn said threaded screw to tighten a drill with a conical shank and a threaded hole in a conical shank into said conical receptacle portion of said drill holder and also to permit sufficient clearance for manual adjustment of said adjusting tool by the hand of a user.