FRAME SUPPORT OF MINE WORKING (VERSIONS) Russian patent published in 1997 - IPC

FIELD: support of horizontal mine workings. SUBSTANCE: the offered support has interconnected props and capping made of hollow members and yielding unit. Each prop consists of upper and lower part of different diameters telescopically inserted in each other. Yielding unit has cylindrical bushing fitted on prop part of small diameter. One end of bushing is engageable with conical surface of cone-shaped ring installed on upper end face of prop other part with large diameter. The other end of bushing is engageable with stop made on prop part with small diameter. In some other version, yielding unit consists of two cylindrical bushing concentrically fitted on small-diameter prop part. First bushing with its end leans against end surface of large-diameter prop part and is made with circular rectangular projections for interaction with the end of the other bushing whose other end is engageable with stop made on small-diameter prop part. Frame support may have removable yoke of two semirings interconnected by fastening members and located between stop and yielding unit. Frame may be made of glass-reinforced plastic. EFFECT: higher efficiency. 4 cl, 4 dwg