Patent ID: 7698920

Claim:
A mechanical key comprising a key plate formed with a coded key groove that mechanically locks and unlocks a locking device, and which is operated by inserting the key plate into a single key cylinder of the locking device such that the length of the key groove is inserted inside said single cylinder, wherein the key plate comprises a key plate body; and a pivoting plate pivotally coupled to the key plate body, the pivoting plate being capable of pivoting at a pivot joint and folding 180° with respect to the key plate body such that the key plate body and the pivoting plate are capable of overlapping to a folded position, wherein the key groove is provided on the key plate so as to extend across the key plate body the pivot joint, and the pivoting plate, in a lengthwise direction, the width of the key groove in a width direction of the key plate body and the pivoting plate varying along said lengthwise direction of the key plate such that the varying widths of the key groove are configured to be read by the single key cylinder of the locking device.