FIELD: sample testing. SUBSTANCE: gear for compression test of long-length samples has base 4 carrying loading 1 and bearing 2 grippers for sample 3, casing 6 and sectors 5 intermated along conical surfaces and coupled kinematically correspondingly with base 4 and sample 3 along cylindrical surfaces. Gear includes two pins 7 installed in loading gripper 1. Free end of each pin enters proper screw groove in base 4. Butts of grippers 1 and 2 have cuts directed radially for loading of sample with twisting moment. EFFECT: improved functional reliability and efficiency of gear. 2 dwg
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