Ewald Dorken Ag

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Ewald Dorken Gmbh & Co. Kg

Dieter Jablonka

Jörn Schröer

Klaus Urban

Heinz Peter Raidt

Heinz-Peter Raidt

Rüdiger Laur

Norbert Klingelhage

Eberhard Schepers

Jörn Schroer

Hellmut Herminghaus

A construction element for foundation drainage has an integral, flexible, and substantially water-impervious panel lying generally in a plane and formed with respective arrays of inner and outer bumps to opposite sides of the plane. The outer bumps form outwardly open outer flow channels on the outer face. Normally the panel is applied to a vertical foundation wall with the inner bumps bearing against the wall and the outer passages vertical and opening outward away from the wall. The inner bumps and outer bumps are offset to one another in the plane in two perpendicular directions. Thus the channels communicate also in these two directions and the element can be rolled up. A water-pervious and rigid filter sheet overlies the outer bumps, is spaced outward from the plane, and outwardly closes the channels so that water can filter through the sheet and flow down the channels.

Foundation-drainage panel

A sound-absorbing element of films has adjacent, cup-shaped recesses in the orm of a grid. The bottom surfaces of the films which are to be exposed to the sound field may be excited into dissipative vibrations when sound is incident thereon. The upper edges of the cup-shaped recesses are jointly covered by another flat material web. The bottom surfaces of the cup-shaped recesses are subdivided into bases by one or more crimp-shaped recesses, the depth of which is appreciably smaller than the depth of the cup-shaped recesses. The sound-absorbing element may be used in building, underground and tunnel construction and in vehicle construction.

Sound-absorbing element

A tarpaulin composed of a sheet and edge reinforcing strips attached to the sheet along the edges thereof, only the strips being provided with perforations, at the intended locations of holding eyes, and the sheet being free of perforations so that the perforations in the strips present blind holes, whereby, for use, the sheet can be punched through only at the locations where holding eyes are required while the remaining edge portions of the sheet are left unperforated and thus unweakened.

Tarpaulin with edge reinforcing strip

Growing community of inventors

Herdecke, Germany

Dieter Jablonka