Patent ID: 7624647

Claim:
A spring supported lower clamper for direct tensile test comprising a lower connection member connected with a bottom frame of the test machine, a lower end cap for holding a sample, a lower chain for connecting the lower connection member with the lower end cap, and supporting means for supporting a broken-apart lower part of the sample formed during the tensile test and the lower end cap, wherein the lower end cap comprises a recessed sample-holding part and a mounting part, the supporting means comprises a compression helical spring and a supporting plate which is formed with a through hole, the diameter of the through hole is larger than the outer periphery of the mounting part of the lower end cap, but smaller than the outer periphery of the recessed sample-holding part of the lower end cap and the inner diameter of the compression helical spring, the compression helical spring has one end connected with or in contact with the supporting plate and another end connected with or in contact with the bottom frame of the test machine, the mounting part of the lower end cap extends through the through hole of the supporting plate and is connected with the lower chain, and the mounting part of the lower end cap, the lower chain and the lower connection member are inserted into and surrounded by the compression helical spring.