FRAME LINING Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: frame lining includes caping 1, attachment point 2 of caping to prop. Each lining prop is made sectional of two tubular telescopic members 3, 4. In their relation member 3 is inner and member 4 is outer. Spherical hollows are made on outer surface of inner tubular member 3 over its telescopic section for coupling with tubular member 4. Holes for threaded stop screws 7 are made in body of outer member 4 in compliance with number of hollows. Screws have spherical faces which engage spherical hollows. EFFECT: increased efficiency of operation of lining under yielding mode thanks to provision for constancy of resistance in sectional props. 3 dwg