FIELD: mining. SUBSTANCE: shield powered support for steeply dipping and sloping seams includes sections. Each section has base, floor made of load-bearing lengthwise and crosswise beams and guard with flexible floor. Props and jacks of advancing are installed between the base and floor. Guard with flexible floor is made in the form of individual metal frames, laid down on crosswise beams of the floor and attached to them. Crosswise beams are telescoping. Crosswise beams are attached to lengthwise by fast-detachable clamps, which may be eccentric. Crosswise beams may be of wedge shape to form screen. EFFECT: high capacity. 2 cl, 5 dwg
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SHIELD SUPPORT FOR STEEPLY DIPPING SEAMS | 1993 |
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Authors
Dates
1996-09-20—Published
1993-04-30—Filed