Woodworking – Process – Including monitoring of operation
Reexamination Certificate
2005-07-08
2010-02-09
Self, Shelley (Department: 3725)
Woodworking
Process
Including monitoring of operation
C144S392000, C144S404000
Reexamination Certificate
active
07658215
ABSTRACT:
A wood chipper includes a control system for controlling feed wheel rotation and engine operation to provide safety features and a fuel-saving mechanism. The control system allows the engine to start only when the feed wheel is in neutral; stops and/or reverses rotation of the feed wheel in response to an increased load on the engine; and dethrottles the engine if the feed wheel remains in neutral for a predetermined period of time. A pair of electric switches are activatable by the feed bar whereby an electronic control unit (ECU) can determine the position of the feed bar based on activation or non-activation of the switches and control the feed wheel and engine in light thereof. The ECU controls a pair of directional control valves via respective solenoids to control flow of hydraulic fluid to control rotation of a feed motor which drives the feed wheel.
REFERENCES:
patent: 5050554 (1991-09-01), Ichikawa
patent: 6000642 (1999-12-01), Morey
patent: 6290155 (2001-09-01), Thompson et al.
patent: 6814320 (2004-11-01), Morey et al.
patent: 6830204 (2004-12-01), Morey
patent: 2002/0139877 (2002-10-01), Beam, III
Rayco Manufacturing Inc.
Sand & Sebolt
Self Shelley
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