MACHINE FOR TENSILE TESTING OF MATERIALS Russian patent published in 1997 - IPC

FIELD: testing equipment. SUBSTANCE: machine has bed plate 1 carrying loading mechanism manufactured in the form of passive 2 and active 3 grippers for ends of sample 4, bell-crank and two limit switches. Machine incorporates loader in the form of two coaxial bushings mounted with clearance relative to each other, screw which one end is coupled to active gripper, two nuts 10 and 11 on screw, mechanisms to rotate nuts. Each of them is made in the form of blocks 12 and 13, flexible coupling passing over block, one end of it is wound on to proper nut and weight 14 and 15 coupled to its other end. Inner bushing 7 is manufactured from material with coefficient of linear expansion larger than that of material of outer bushing 6. Outer bushing rests against bed plate 1. Machine also has heating element 8 put on inner bushing 7 and bracket 10 hinged to smaller arm of lever 17. One nut rests against inner bushing, against collar inside it on side of bed plate 1. Second nut is mounted in outer bushing 6 and rests against bed plate 1. Free ends of bushings are intended for interaction with the aid of collars. EFFECT: simplified design, increased functional reliability and efficiency. 1 dwg