Patent ID: 7544034

Claim:
An elevating platform system, having a parallelogram-shaped lifting mechanism, for attachment to vehicles, the system comprising: a first carrier arm for carrying the platform; a second carrier arm for carrying the platform, said second carrier arm horizontally separated from said first carrier arm; a pivot axis on which said first and said second carrier arms are borne for rotation; a parallel cylinder for pivoting the platform from a vertical traveling position into a horizontal working position and vice versa; a lifting cylinder lever, borne for rotation about said pivot axis; a lifting cylinder engaging said lifting cylinder lever for raising and lowering the platform in a working position thereof, said lifting cylinder and said lifting cylinder lever cooperating to form a force triangle; a torsion profile connected between said lifting cylinder lever and said second arm; and a spring unit supported on one side by said first carrier arm and communicating, at another side, with said lifting cylinder lever or with an end of said lifting cylinder to elastically couple said first carrier arm to said lifting cylinder lever for motion in a lifting direction.