Device for testing the bending stiffness and bending strength and/or the elastic resilience of rod material

摘要

A device is described for testing the bending stiffness and bending strength and/or the elastic resilience of rod material of relatively small cross-sectional dimensions, such as wire or connecting elements produced herefrom, especially of nails for the production of the joining connections of flat pallets formed from planks and blocks. In the application of this device, a rod-material section or nail 12 is fastened over part of its length in a chuck 3 resting on a base, while the partial piece of the same projecting over the chuck 3 projects freely into the movement track of a bending element guided on the base. The bending element consists in this case of a two-armed lever 18 mounted on the base 1 so as to be pivotable about an axis 17 running approximately normal to the longitudinal axis of the clamped rod-material section or nail 12. Its one lever arm 19 can be applied laterally as a load-lever arm having a pressure surface 23 to the free rod-material section or nail 12, while the other lever arm 20 contains a torque meter and forms the force lever arm actuable by means of a setting force. IMAGE