Abstract: There is provided a molded connection piece and a method of making the same, in particular a boring saddle made of thermoplastic material and having a heating wire capable of conducting an electric current for producing a welded joint between the molded connection piece and an object to be joined with the molded connection piece. The heating wire is embedded in both surfaces of a disk-shaped core, in each case following the course of a spiral-shaped groove, and the core having the heating wire is joined with the molded connection piece. The disk-shaped core is formed of a material which, on melting, combines itself with the material of the molded connection piece.

Abstract: There is provided a molded connection piece and a method of making the same, in particular a boring saddle made of thermoplastic material and having a heating wire capable of conducting an electric current for producing a welded joint between the molded connection piece and an object to be joined with the molded connection piece. The heating wire is embedded in both surfaces of a disk-shaped core, in each case following the course of a spiral-shaped groove, and the core having the heating wire is joined with the molded connection piece. The disk-shaped core is formed of a material which, on melting, combines itself with the material of the molded connection piece.

Abstract: In order to weld butt-jointed plastic tubes, a welding element with a wire coil for electrical resistance heating is positioned between the abutting tube ends. The tube ends are pressed to each other while at the same time the welding device is heated to welding temperature. Lastly, the tube ends are held together until the welded area has hardened by cooling. The welding device is constructed in the form of an annular disc the external diameter of which is approximately equal to the external diameter of the tubes and the internal diameter of which is approximately equal to the nominal internal diameter of the tubes. A heating wire coil spirals around the geometric center of the annular disc, and is positioned on the two annular disc surfaces that come into contact with the tube ends.

Abstract: A level indicating device for liquid filled containers is provided having a floating sensing element which is operatively connected with a signal device, the sensing element having several, preferably three floats arranged on a single plane. The floats are supported on lever arms which are interconnected with each other at a central union. The lever arm union is supported for free movement in a guide disposed approximately in the center of the container and approximately vertically aligned with the surface of the liquid when the liquid is at rest. The longitudinal movement of the lever arm union in the guide caused by changing liquid levels is transmitted to a signal device for monitoring the liquid level.