Patent ID: 7171894

Claim:
A removable marking device for a mold comprising: a substantially cylindrical fixed tube having carved letters on its upper surface, and said fixed tube fixed to said mold, a substantially cylindrical rotatable tube having carved letters on its upper surface, and the rotatable tube rotatably inserted into said fixed tube, an indicator axle rotatably inserted into said rotatable tube, a control mechanism that allows only said indicator axle to rotate when said indicator axle rotates in one direction and that allows said indicator axle to rotate with said rotatable tube when said indicator axle rotates in the other direction, wherein said control mechanism comprises: a control space formed inside said rotatable tube, a fixing portion that moves in and out radially and that is inserted in the indicator axle, wherein said control space comprises: a cylindrical space that is concentric with the axis of said rotatable tube and a projecting space protruding radially from said cylindrical space, and said projecting space having a pair of sides extending from said cylindrical space, wherein a line is defined by two points from which said a pair of sides extend outwardly, wherein the angle between one of said pair of sides and said line is different from the angle between the other of said pair of sides and said line.