Patent ID: 6446892
Filing Date: 2002-09-10
Classification: B02C

Abstract:
A crusher comprising:a body containing a gyratory conical head, an intermediate member supported above the body having a helical threaded connection to an upper member, the upper member supporting a concave die that cooperates with the conical head for crushing material in a gap defined between the conical head and the concave die, the gap being adjustable by helical rotation of the upper member relative to the intermediate member, the intermediate member and the upper member each having opposed surfaces extending radially away from the threaded connection; and at least one hydraulic jack disposed between the opposed surfaces whereby extension of the at least one hydraulic jack urges the upper member away from the intermediate member thereby preventing rotation of the upper member relative to the intermediate member and, retraction of the at least one hydraulic jack permits rotation of the upper member relative to the intermediate member.