Device for insertion by welding of a plastic pipe section into a shaped plastic piece

In an apparatus for inserting a plastic pipe section into a shaped plastic piece for welding according to a heating element method, wherein two carriages, each having a clamping element, are mounted on a base frame and can be displaced with respect to each other with a setting device, and a heating device is pivotal into and out of position between the two clamping elements with the clamped plastic pipe section and the clamped shaped plastic piece with levers pivotally mounted to the base frame, and the heating device has a heating element with a cupped section for placing over the plastic pipe section and a cylindrical section for insertion into the shaped plastic piece, the improvement comprising:

• the heating device (30) having a plurality of different heating elements (31, 32, 33), each with a cupped section and a cylindrical section;
• the heating device (30) rotatably mounted with respect to the pivot levers (21, 22) such that with the heating device (30) in a set position the heating elements (31, 32, 33) are rotatable between the two clamping elements (14, 17) which hold the clamped plastic pipe section and the clamped shaped plastic piece;
• with the pivot levers (21, 22) pivoted into the set position a rotating shaft (23) of the heating device (30) positioned vertically above a central axis (20) of the clamping elements (14, 17) and vertically above the clamped plastic pipe section and the clamped shaped plastic piece;
• the heating elements (31, 32, 33) are positioned within the heating device (30) with each center axis of each of the heating elements (31, 32, 33) arranged on a circumferential path around the rotating shaft (23) of the heating device (30), and a radius of the circumferential path is equal to a distance from a shaft center of the rotating shaft (23), when pivoted into the set position, to the central axis (20) of each of the respective clamping elements (14, 17);
• and
• the two pivot levers (21, 22) are pivotally mounted on a back portion of the base frame (10), each of the pivot levers (21, 22) having a horizontal section extending between a corresponding clamping element of the two clamping elements (14, 17) when the heating device (30) is pivoted into the set position, and the heating device (30) positioned between each of the horizontal sections of the pivot levers (21, 22).