US 9,808,902 B2
Powered tool sharpener with multi-speed abrasive
Daniel T. Dovel, Shady Cove, OR (US)
Assigned to Darex, LLC, Ashland, OR (US)
Filed by Darex, LLC, Ashland, OR (US)
Filed on Feb. 10, 2017, as Appl. No. 15/430,252.
Claims priority of provisional application 62/294,354, filed on Feb. 12, 2016.
Prior Publication US 2017/0232569 A1, Aug. 17, 2017
Int. Cl. B24B 3/54 (2006.01); B24B 49/10 (2006.01); B24B 51/00 (2006.01); B24B 21/00 (2006.01)
CPC B24B 3/54 (2013.01) [B24B 21/002 (2013.01); B24B 51/00 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A sharpener for sharpening a cutting tool having a cutting edge, comprising:
a moveable abrasive medium having an abrasive surface;
a guide assembly adjacent the abrasive medium configured to support a cutting tool thereagainst;
a drive assembly configured to move the abrasive medium with respect to the guide assembly responsive to a control input value; and
a control circuit configured to provide a first control input value to move the medium at a first speed relative to the guide assembly during a coarse sharpening operation in which a user presents the cutting tool against the medium using the guide assembly to shape a side of the cutting tool and generate distended material from the cutting edge, and to subsequently provide a second control input value to transition the medium from the first speed to a lower second speed relative to the guide assembly during a fine sharpening operation in which the user presents the cutting tool against the medium using the guide assembly to remove the distended material and provide a sharpened cutting edge.