US Patent 7175185 Bit holder

A bit holder comprises a shank, a sleeve placed over the shank, and an adjusting sleeve coupled to the sleeve. The shank has a combination part for incorporating with a hand tool, a C-shaped retaining groove for engaging with a C-shaped buckle, and a combination groove for holding a bit. The sleeve has an inner ring with a gap for assorting with a locking bulge on the shank and a position bead hole on its outer threading for accommodating a position bead. The adjusting sleeve with an inner threading for locking the outer threading of the sleeve has a long groove on its inner wall and, by using this long concaved groove to assort with the position bead, the locking position between the adjusting sleeve and the sleeve can be adjusted.