Klockner-werke Ag

Niederholz Gmbh

Angelo Cassone

Wilfried Dünnwald

Willy Watermann

Karl Heinz Wehner

Gunter Bell

Ulrich Niederholz

An advancing excavation roof support has a base and a shield assembly above the base. The base has two base portions which are spaced from one another at its end which faces toward the face of the excavation, and a lifting member is mounted between the two base portions for pivoting about an axis. A hydraulic cylinder-and-piston unit extends between the base and the lifting member and pivots the latter about its pivoting axis between a retracted position in which the lifting member is out of contact with the excavation floor, and an extended position in which an engaging portion of the lifting member engages the excavation floor and is downwardly spaced from the base so that the one end of the base which faces the excavation face is elevated and digging thereof into the excavation floor is prevented. The lifting member may be either of box-shaped configuration with an open top, and in that case a transverse beam rigid with the base portions carries a downwardly extending cylinder-and-piston assembly engaging the lifting member intermediate the axis and the engaging portion thereof, or a single-acting lever mounted on a pivot in an upper region of the base, and in that event cylinder-and-piston assembly exerts a force on the lever in direction toward the excavation face.

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Herten, Germany

Angelo Cassone