To provide a crime prevention screw mechanism which surely fixes an attachment cover to a hexagon bolt head and a nut by a blind rivet or a drive rivet, and is prevented from being removed by a working tool.
A hole into which an end of the drive rivet or the blind rivet is inserted is provided in a hexagon member constituting the hexagon bolt head part, a screw pitch designated to attach a set screw with a hexagon socket or a sizing screw from an opposite side is provided while a part of a rivet insertion hole diameter remains, a part of a section to a rivet end insertion hole remains by a screw below hole diameter, the set screw with the hexagon socket is fixed and attached, the attachment cover having a hole through which the end of the rivet can be inserted is covered on a special hexagon head bolt having a space where the rivet end, is opened in the hexagon bolt head, the rivet is inserted, the rivet end is opened in the space in a special hexagon bolt head by hitting a pin of the drive rivet, or by pulling a shaft of the blind rivet, and the attachment cover is designed so as not to come off from the bolt head.
OTAKE SHINGO
HIRONO MASARU
MAEDA SATORU
