The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 1999
Filed:
Mar. 30, 1998
Matthew B Haven, Cedarburg, WI (US);
James C Bremer, Slinger, WI (US);
Astec Industries, Inc., Chattanooga, TN (US);
Abstract
A gyratory crusher includes an anti-spin mechanism which is coupled to a lower end of a main shaft of the crusher and which prevents the main shaft and associated crushing head from spinning when the crusher is not subject to a crushing load. The anti-spin mechanism includes 1) a hydraulic brake, and 2) a gear train which couples the main shaft to the hydraulic brake so as to drive the hydraulic brake to rotate faster than the main shaft while at the same time permitting relative sliding motion between the main shaft and the hydraulic brake without unduly increasing the complexity or height of the crusher. The hydraulic brake is supercharged so as to respond immediately to a tendency of the main shaft to spin. As a result, only relatively low braking forces are required to prevent spinning.