Gc Corporation

Sony Group Corporation

Yusuke Ishikawa

Hitoshi Nakamura

Naoto Fujii

For certainly handling a screw member, a screw memberincludes a male screw, and an inner peripheral face of the holehas an engaging recessed partto be engaged with an engaging projected partof a tapered engaging partof a rotary tool, and a stepped part, said inner peripheral face is parallel or make close to a center axisof the screw memberfrom the head partin a direction of the male screw and from the stepped partin the direction of the male screw, and head part side end edgeand an end edge of the stepped partto be engaged with the engaging projected parthave an angle of said inner peripheral face being 90&#xb1;5 degrees with respect to the head partand the stepped part

Screw member

For easy washing and sterilizing of a holding tray for drill bits used in a dental implant operation, a holding tray X includes a tray main bodymade of a hard material capable of autoclave sterilizing and holding membersmade of an elastic material capable of autoclave sterilizing, the tray main bodyincludes holding platesand holding member supporting plateson a back surface of a substrate parthaving rows of linearly aligned through holesfor drill bits, the holding platesinclude half circular cylindrical recessed partsat portions corresponding to the through holes, the supporting plateshave a fixed interval to a planealong the recessed part, and the holding membersare detachably held between the holding platesand the supporting platesto hold the drill bits together with the recessed parts

Growing community of inventors

Tokyo, Japan

Yusuke Ishikawa