Tensioned bolt arrangement for securing vibratory sieve - has spring tension applied through intermediate sleeve with end collar limiting travel if bolt fails

摘要

The tensioned bolt arrangement secures a vibrating sieve (9) to frame (1). It consists of a tension bolt (5') having one end (5,5a) hooked over the edge (11) of the sieve, and the other end (5b) tensioned away from the sieve frame by a coil spring (10). One end (10a) of the spring abuts against the sieve frame and the other end (10b) against a nut (4) screwed onto an intermediate sleeve (2a) co-axially surrounding the tension bolt and passing through a hole (3') in the frame. On the inner end of the sleeve is a collar (2) limiting its axial movement. A nut (6) on the end of the tension bolt can be screwed up against the outer end (2c) of the sleeve to adjust the spring force . The intermediate sleeve has a length greater than that of the loaded spring but less than that of the unloaded spring. In the event of failure of the hooked end of the tension bolt, the spring is unloaded by a small distance (a), limiting the energy propelling the bolt. ADVANTAGE - Greater safety without increase in vibratory mass or overloading of adjacent bolts.