Patent ID: 8739971

Claim:
A stopper storage case, comprising: a case body having a first end, sides, and a second end, which is opposite from the first end of the case body; a plurality of parallel openings formed in the first end of the case body; a plurality of parallel drill blade insertion paths formed in the second end of the case body; concave parts of different lengths formed between respective openings and drill blade insertion paths of the case body such that each concave part together with a respective opening and drill blade insertion path forms a through-hole from the first end of the case body to the second end of the case body, wherein each concave part comprises a protrusion on an inner surface thereof and a stopper holding overhang at the top of each concave part; and (Y) a plurality of stoppers each formed as a cylinder having a first end and a second end opposite to the first end, and each comprising (Ya) a stopper through-hole formed between the first end and the second end of the stopper, (Yb) a spring engagement portion at the first end of the stopper, and (Yc) a groove formed in the outer peripheral surface of the stopper, wherein the protrusion of the inner surface of the concave part is engaged with the groove (Yc) formed in the outer peripheral surface of the stopper, wherein the stopper storage case is configured such that when a drill (X) comprising a blade (Xa) at a free end, a shank (Xb) at the other end, and a projecting flange (Xc) disposed between the blade (Xa) and the shank (Xb) is inserted into the opening of the case body, the blade (Xa) of the drill passes through the stopper through-hole (Ya) and the drill blade insertion path at the second end of the case body, and the projecting flange (Xc) of the drill engages the spring engagement portion (Yb) of the stopper thereby defining a penetration depth of the blade (Xa).