Patent ID: 6877539

Claim:
Welding apparatus ( 1 ) for welding plastic work pieces with a base frame ( 2 ) in or on which two welding tables ( 15 , 16 ) are arranged next to one another and on which the plastic work pieces are capable of being securely clamped and which are mounted in a manner that permits displacement, whereby a propulsion device is provided for displacing the welding tables ( 15 , 16 ) in opposite directions of movement, and whereby the propulsion device has a drive motor ( 48 ) and a propulsion rod assembly that transfers propulsive force from the drive motor ( 48 ) to the welding tables ( 15 , 16 ), characterized by the feature that the propulsion rod assembly has spatially separated double arm levers ( 25 , 26 ) with two lever arms in each case, whereby the spatially separated double arm levers are oriented transversely to the directions of movement (arrows A) of the welding tables ( 15 , 16 ), whereby the two lever arms are each mounted in a rotatable manner on an axis of rotation ( 19 , 20 ) and are in a mechanical state of rotary connection with one another, and whereby one set of lever arms is kinematically connected to one welding table ( 15 ) and the other lever arms are kinematically connected to the other welding table ( 16 ) in such a way that, during rotary movement of the double arm levers ( 25 , 26 ), the welding tables ( 15 , 16 ) are moved toward one another in one direction of rotation (arrow B), and away from one another in the other direction of rotation (arrow B).