Stress resistance of technopolymer adjustable handles
Adjustable handles are used for repetitive clamping operations. Therefore, the stress resistance (i.e. resistance to repeated tightening cycles) of the handle unit is particularly important and, especially, the strength of the toothed element which transmits the tightening force from the handle to the threaded element (boss or stud).
In fact, the results of several laboratory tests, performed with special equipment simulating the most severe conditions, have shown that, for example, ERX.78 technopolymer adjustable handles can withstand without yielding more than 100,000 tightening cycles, under the action of a force of 490 N (see diagram).
The special glass-fibre reinforced technopolymer enables the ELESA adjustable handles to guarantee stress resistance values which are higher than the ones generated under normal working conditions.