Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
David S. Majkrzak0
Date of Patent
August 24, 2010
0Patent Application Number
117289990
Date Filed
March 28, 2007
0Patent Primary Examiner
Patent abstract
The present disclosure relates to a wood chipper that has a feed roller driven by a hydraulic motor. Hydraulic fluid under pressure is provided to the motor through a two-stage pump, providing separate flows of fluid under pressure. The flows of the pump stages are combined for normal operation of the chipper. A bypass that will bypass the flow from one pump stage when the pressure of the fluid under pressure driving the motor exceeds a pre-selected level from increased load on the feed roller is provided. When the bypass is open the feed roller is slowed to reduce the feed rate of material into the chipper, and when the feed roller loads reduce, the flows will again be combined to speed up the feed roller.
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