Patent ID: 7603733

Claim:
A dock leveller comprising: a frame having an extension hinge for pivotal movement along a first axis and a first pivot connection defining a second axis, the respective axes oriented at a first spacing there between; a deck coupled to the extension hinge having a deck plate with a deck upper surface; a lip having a lip upper surface, the lip upper surface and the deck upper surface forming a least a part of a transport path; a lip hinge coupled to the lip and the deck for relative pivotal movement of the respective lip and deck upper surfaces along a third axis that is oriented a second spacing from the first axis; a second pivot connection operatively coupled to the lip and defining a fourth axis that is oriented with respect to the lip hinge third axis identical to the first spacing; and a transmission member pivotally coupled to the first and second pivot connections, establishing an operable spacing between the second and fourth axes that is identical to the second spacing in at least one mode of operation, so that the four respective axes define vertices of a parallelogram.