Material testing machine

摘要

When a crosshead descends after a specimen is loaded, pins attached to link members contact seat surfaces formed on seat members, and then contact side walls of the seat surfaces. As the crosshead descends further, the pins contacting the seat surfaces press the seat members 31. This pressing force moves a pair of first slide members away from each other as guided by a first rail, and moves a pair of second slide members away from each other as guided by a second rail 24. Consequently, tension loads in biaxial directions perpendicular to each other are applied to the specimen gripped by four chucks 25.

主权项

1. A material testing machine comprising:
a lower unit, the lower unit comprising: a pair of first moving members each having a chuck for gripping a specimen, the first moving members being movable toward and away from each other along a first axis by being guided by a guide member; a pair of second moving members each having a chuck for gripping the specimen, the second moving members being movable toward and away from each other along a second axis by being guided by a guide member; an upper unit, separable from the lower unit, the upper unit comprising: a load member for receiving a load applied by a loading mechanism; and four link members for connecting the pair of first moving members and the pair of second moving members to the load member, respectively; the load applied to the load member being transmitted through the four link members to the pair of first moving members and the pair of second moving members, thereby synchronously to move the pair of first moving members away from each other along the first axis, and to move the pair of second moving members away from each other along the second axis; wherein either the first moving members and the second moving members or the link members have seat surfaces formed thereon, while the other have contact portions formed thereon and shaped to correspond to the seat surfaces; and the seat surfaces and the contact portions are movable into contact with each other, respectively, thereby to connect the pair of first moving members and the pair of second moving members to the load member through the four link members.