Bochumer Eisenhutte Heintzmann & Company

Gustav Neu

Hans-Ferdinand Bemmerl

Gunter Blumenthal

A mine roof support for an underground mine gallery comprises a sole plate adapted to rest on the floor of the mine gallery. The sole plate is connected by links to the region of the lower end of a rear shield, and the upper end of the latter is connected by pivot means to a roof shield, between opposite ends of the latter, in such a manner that a portion of the roof shield between the front end thereof and the pivoted means is considerably longer than the portion of the roof shield between the pivot means and the rear end of the roof shield. At least one extensible and collapsible prop extends between the sole plate and the portion of the roof shield which is located forwardly of the pivot means and at least one additional prop extends between the sole plate and the rear shield, so that the roof shield may be pressed against the roof of the mine gallery and be shifted relative to the mine face.

Mine roof support

A mine roof support for underground excavations includes a support adapted to engage the floor of the underground excavation, and a movable roof shield which engages the roof of the underground excavation. A movable rear shield is mounted on the support and is pivotally connected with the roof shield for relative movement thereto about a pivot axis. A pit prop arrangement is provided intermediate the shields and the support for moving the shields relative to each other about the pivot axis between a plurality of inclined positions in which the rear shield is inclined at different angles of inclination relative to the roof shield. A pair of abutment members are respectively provided on the shields for limiting relative movement of the latter beyond a predetermined one of the inclined positions in which the shields are inclined at a predetermined angle of inclination relative to each other.

Arrangement for supporting roofs of underground excavations

An underground excavating system includes a conveyor device which is operative for conveying material away from a mine face, and an excavation roof support device which is operative for supporting the roof of the excavation. A hydraulic cylinder-piston unit is operatively connected to both of the devices and is operative for advancing one of the devices towards the mine face while the other of the devices remains stationary, and vice versa. A guiding arrangement is connected intermediate the control unit and the conveyor device and is operative for guiding the advancing device during its advance towards the mine face. The guiding arrangement includes a pair of elongated support members which are spaced apart of each other and which have one end region located closer to the mine face and another end region located further from the mine face. The guide arrangement further includes a pair of guide sleeve members one at each of the aforementioned end regions. Each sleeve member has wall portions which bound a passage through which the end portions of the support members pass at a spacing relative to each other. The arrangement further includes a pair of insert members respectively connectable to the conveyor device and the control unit. Each insert member is located in a respective passage of the sleeve members and is received between the end portions of the support members for maintaining these end portions at the aforementioned spacing. The insert members and the support members are detachably connected to the sleeve members so as to permit rapid interchange of any of the members which are defective with a replacement member.

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Bochum, Germany

Gustav Neu