Hans Grohe Gmbh & Co Kg

Eugen H Stahl

Thassilo A Von Glanstatten

A flexible armored synthetic resin hose for showers, with an extruded inner hose part of thermoplastic or elastomeric material, an extruded outer hose part of thermoplastic or elastomeric material, which is at least partly supported so as to be spaced from the inner hose part, and a reinforcement helix for armoring the hose, said helix being placed between said inner and an outer hose parts.

Flexible armored synthetic resin hose, more specially for showers

A reinforced plastic pipe is produced by feeding a plastic tube along a feed path while directing a reinforcement strip into a path around a tube so as to wind it into spiral coils which are spaced radially outwardly of the tube and including subsequently pushing the coils in an axial direction while deflecting them inwardly to cause their diameters to be reduced so that they engage around the surface of the tube. The tube is advantageously fed directly from an extruder in a tacky state so that the reinforcement strip will be immediately bound to the surface when it is directed into engagement therewith. The apparatus for carrying out the method includes a thin tubular mandrel disposed around the tube which is formed by an extruder and a winding device is associated with a reel supply of the reinforcement strip so as to feed it around the mandrel. A cam device is then applied around the mandrel to successively force the coils, after they have been formed into groups, off the mandrel in the same direction of feed as the newly formed plastic tube.

Method and apparatus for producing a reinforced plastic pipe

A flexible plastic tube, comprises, an extruded inner tube or tubular portion and an extruded outer tube or tubular portion of a thermoplastic material overlying the inner tubular portion and spaced radially outwardly therefrom and including a reinforcing strip of substantially U-shape configuration wound around the inner portion and bonded to the inner and outer tubular portions. The reinforcing strip has radially extending sidewalls in the form of fins which define a first cavity therebetween and, in addition, successive turns of the reinforcing strip define a second cavity therebetween which is located between the outer and inner walls. The sidewalls advantageously have radially outwardly tapered cross-sectional shapes. The inner wall is first extruded and may advantageously be reinforced by embedding axially reinforcing fibers in its outer surface and, while it is still not set, the reinforcing strips of a harder material in the inner and outer walls are wound around the inner wall so that it becomes bonded to the inner wall as the inner wall is set. Thereafter, the outer wall is extruded and bonded immediately to the leg portions of the reinforcing strip. In addition, a metalized material may be positioned by alignment of grooves into the first cavity between the sidewalls of the reinforcing strip and applied under tension during the application of the outer wall.

Growing community of inventors

Bottingen, Germany

Eugen H Stahl