Patent ID: 7275909

Claim:
A working machine, comprising a lift arm and an implement coupling fixed to the lift arm and comprising a locking element, the locking element being displaceable between an inoperative position and an operative position in which it is adapted to be received in a hole in an implement in order to lock the implement to the implement coupling, wherein the locking element, over a first section of its length, has a first cross-section sized to permit the first section of the locking element to be received in the hole in the implement, and over a second section, which adjoins the first section, the locking element has a second cross-section sized to prevent the second section from being received further in the hole, the second section comprising a stop face adapted to bear against the implement when the locking element secures the implement to the implement coupling, wherein in the circumferential direction of the locking element the stop face only extends over a part of a circumference of the locking element.