Firma Carl Freudenberg

Volker Schwarz

Klaus Heckel

Friedemann Klaffke

Walter Umann

Hermann Rapp

Konrad Mader

A radial shaft sealing ring comprises a stiffening ring as well as a sealing lip and an annular seal which are integrally combined by radial connecting sections running through notches in the stiffening ring. The annular seal is mounted in recesses in the stiffening ring, which have an increasing depth radially toward the driving surface.

Radial shaft sealing ring

In a pipe insulating jacket comprising a hollow cylinder made of a soft foamed material and an outer sleeve with abutting edges parallel to the axis of the pipe, the improvement wherein the outer sleeve is formed by a metal foil carrying a heat-softenable coating on its inside, the inside of the metal foil being bonded throughout to the surface of the soft foamed material and in proximity to the abutting edges being welded to itself along its upwardly bent edges. Advantageously the foam is closed-cell crosslinked polyethylene of a bulk density of about 30 kg/m.sup.3, the coating is unfoamed uncrosslinked polyethylene about 30.mu. thick, and the metal foil is an aluminum foil about 18.mu. thick carrying on its outside a foil of heat-softenable polyester about 5 to 20.mu. thick.

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Hirschberg, Germany

Volker Schwarz