TEMPORARY SUPPORT PROP

摘要

mining; applicable in support of mine workings. SUBSTANCE: prop has external and internal pipes with upper and lower supporting members, retainers and screw pair having nut and screw. Screw pair is made in the form of ball-and-screw gearing. Nut is rigidly connected with internal pipe and screw is rigidly secured to bushing fitted on wedge installed in holes located at definite spacing on external pipe. Internal pipe may be made of glass-reinforced plastic. EFFECT: higher operating reliability of prop at its reduced weight. 2 cl, 1 dwg