TENSION TESTING CATCH Russian patent published in 1998 - IPC

FIELD: tension tests. SUBSTANCE: catch has hollows body 1, driving part, rod 7, peripheral 2 and clamping 3 pairs of wedges positioned in body 1. Peripheral pair of wedges 2 is mounted diametrically in body 1 for turning relative to central axis and has grooves on internal surfaces. Clamping pair of wedges 3 is positioned in these grooves. External surface of peripheral wedges 2 is cylindrical shape, and when closed, their external diameter corresponds to hollow diameter of body 1. Contacting surfaces of clamping 3 and peripheral 2 wedges are made at angles which provide for parallelism of cylindrical surface generatrix of peripheral wedges 2 and surfaces of clamping wedges 3. Catch transfer part is made as base 6 with internal thread positioned on rod 7 which has spring-loaded rest with cylindrical turning. Clamping wedges 3 are provided with projections. Catch body 1 has external thread engaged with driving part of catch, and projections of clamping wedges 3 enter cylindrical turning of rest. EFFECT: higher test results. 2 dwg