Self tightening mantle retention assembly for gyratory conical crushers

A self tightening mantle retention assembly for a conical crusher having a crusher bowl, said self tightening mantle retention assembly comprising:

• a frustoconically shaped head member having a first threaded aperture formed therein and a second threaded aperture associated therewith;
• a frustoconically shaped mantle supported on the head member and adapted to gyrate within the crusher bowl;
• a locking bolt having an externally threaded portion engaged in said first threaded aperture of said head member, and a cylindrical ridge for applying a force to an upper edge of said mantle, such that engagement of said locking bolt externally threaded portion in said first threaded aperture applies a force to secure said mantle to said head member;
• and
• a central bolt having a head at one end and being threaded at the other end, said central bolt passing through a hole in said locking bolt with said threads of said central bolt being engaged in said second threaded aperture of said head member, whereby tightening of said central bolt, with said central bolt head engaging said locking bolt, creates a compressive force between said head member and said locking bolt, the threads of said first and second apertures and the threads of said locking bolt and of said central bolt being in a direction, such that the rotational force applied to said head by the material being crushed is in a direction to tighten the engagement of said threaded portion of said locking bolt in said first threaded aperture, and said threads of said central bolt in said second threaded aperture.