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:
Sep. 17, 2002
Filed:
Mar. 09, 2000
Henrik Nieschulze, Wieren, DE;
Deere & Company, Moline, IL (US);
Abstract
A sharpening apparatus for sharpening the blades of a forage harvester chopper drum includes a carriage to which is mounted a grindstone carrier that holds a grindstone that is moved across the chopper drum during sharpening operation. The grindstone carrier includes an element which is mounted to the carriage for movement towards the chopper drum in order to advance the grindstone. The carrier element contains a threaded bore in which is received a threaded shaft that has a ratchet wheel fixed to it. A pawl is located in the path of movement of the ratchet wheel so as to be engaged thereby when the carriage reaches a reversal point at one side of the drum, this engagement causing the ratchet wheel to be rotated by an angular distance occupied by one tooth so that the threaded shaft causes the grindstone carrier to move axially therealong and toward the chopper drum so as to advance the grindstone. In one embodiment the element of the carrier is cylindrical and is received in a cylindrical opening in the carriage and fixed therein against rotation by a pair of feather keys. In a second embodiment, the element of the carrier is a block, with the block and the carriage having cooperating surfaces which guide the movement of the carrier towards the chopper drum while preventing any rotation of the carrier about the axis of the threaded shaft.