Klockner-werke Ag

Willy Watermann

Karl Heinz Wehner

Gunter Bell

Walter Von Der Linden

Angelo Cassone

A mine roof support for an underground mine gallery comprises a sole plate adapted to rest on the floor of the mine gallery, a front shield having a front end directed toward the mine face, a rear shield pivotedly connected at one end to the other end of the front shield and projecting rearwardly therefrom, a rocker arm connected at opposite ends respectively to the front and to the rear shield intermediate opposite ends of the shields, an expandable and contractable prop connected at one end to said rocker arm intermediate the ends of the latter and at the other end to said sole plate, and a pair of arms each pivotally connected at one end to the region of the rear shield distant from the front shield and at the other end to the sole plate.

Mine roof support for an underground mine gallery

A pit prop has a floor-engaging foot, at least one arm pivoted at the rear of this foot and extending forwardly, a roof-engaging shield carried at the front end of this arm, and at least one ram extending vertically between the arm and the foot for pressing the shield against the roof and the foot against the floor. A hydraulic ram has its rear end pivoted at the rear end of the foot and its front end pivoted on the rear end of a rigid link whose front end in turn is pivoted on the face conveyor. The rear end of this link is slidable in and pivoted on the foot. A second link has its front end pivoted on the rear end of the main link and its rear end bearing vertically down against the foot but slidable therealong. A short lifting ram has its rear end pivoted on the rear end of the second link and its front end pivoted on the rear end of the main link above the pivot for the other displacement ram pivoted on this link. Thus expansion of this lifting ram raises the front end of the foot of the pit prop off the floor.

Pit prop with liftable front end

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.

Growing community of inventors

Dortmund-Berghofen, Germany

Willy Watermann