Patent ID: 6311989
Filing Date: 2001-11-06
Classification: B25B,Y10S,Y10T

Abstract:
A chuck for screwdriver inserts (20, 21, 22), having an insertion cavity (8) of a bush (5), the insertion cavity (8) being adapted in cross section to a polygonal section of an insertion shank (23) of a bit, defining a shank polygon, windows (16) opposite one another in a corner region of the insertion cavity (8) being located in the bush (5), and round clamping bodies (19, 19') lying in said windows (16) on supporting shoulders (18), the diameter of which clamping bodies (19, 19') is greater than window wall thickness and which are loaded inward toward the cavity by an inclined surface (14) of a spring-loaded actuating sleeve (9) and press in point contact against the corner of a corner recess of the insertion shank (23), wherein the clamping bodies (19, 19') are offset from one another in axial direction such that, in case of a corner recess in form of an annular flute (25), a rear of the clamping bodies (19') sits on the corner (E), and a front of the clamping bodies (19), lying on the supporting shoulders (18), projects freely into the annular flute (25), and, in case of a corner recess in form of a prismatic notch (28) or in form of a bevel (26), the front clamping body (19) sits on the corner (E', E"") and the rear clamping body (19') bears against an edge of the shank polygon.