Feed control hydraulic circuit for wood chipper attachment

Details Feed control hydraulic circuit for wood chipper attachment Feed control hydraulic circuit for wood chipper attachment

1999-11-29

2001-09-25

Rosenbaum, Mark (Department: 3725)

Solid material comminution or disintegration

Apparatus

Comminuting surface provided with openings to permit...

C241S101200

Reexamination Certificate

active

06293479

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a wood chipper which includes a rotary chipper wheel, and a feed roller that will drive logs, branches and the like into the chipper wheel. The wheel and feed roller are driven by separate hydraulic motors, and the hydraulic circuit includes a flow priority valve that provides priority of flow to the chipper wheel motor, and includes a relief valve that is set so that the feed roller can be reversed if jams occur.
Various lock chippers have been advanced in the art, and problems with jamming the chipper wheel that is used have existed. For example, U.S. Pat. No. 3,524,485 shows a log chipping apparatus that has a rotatable chipping wheel and an infeed conveyor, with a speed sensing device for sensing changes in speed of rotation of the chipper wheel. The feeding conveyor is enabled or disabled in accordance with the changes in speed of the chipper wheel.
Drives for moving logs or pieces of wood into a chipping rotor that can be operated to retract the log either with the manual operation or at the time when the cutter speed drops below predetermined amount have been known, as shown in U.S. Pat. No. 4,598,745. This is sensitive to slowing of the chipper rotor or wheel, and reverses the drive of the log when the chipper wheel speed drops.
SUMMARY OF THE INVENTION
The present invention relates to a hydraulic circuit for driver of a wood chipper that will automatically control the flow to a motor for a chipper wheel and a motor for a feed roller as loads on the chipper wheel increase. The hydraulic motors to the chipper wheel and the feed roller, respectively, are provided with fluid under pressure from a hydraulic system on a skid steer loader on which the wood chipper is mounted. The hydraulic system includes a priority flow valve, which is a flow divider that will prioritize flows in a known manner, between the chipper wheel motor and the feed roller, so that initial flow will first be provided to the chipper wheel motor and excess flow to the feed roller motor. As loads increase on the chipper wheel the flow to the feed roller motor is reduced and the feed rate into the chipper wheel is reduced automatically.
Additionally, reversal of the feed roller to move a log or piece of wood away from the stalled chipper wheel is desirable and is accommodated by providing a relief valve setting for the motor for the chipper wheel that is lower than the main relief valve setting on the skid steer loader hydraulic system so that pressure continues to be available to the feed roller motor for reversing even if the chipper wheel jams and the relief valve to the chipper wheel motor opens.
The hydraulic system accommodates the attachment connections on the auxiliary hydraulic systems of a skid steer loader.


REFERENCES:
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Advertising brochure re: Crary Bear Cat Chipper/Shredders (prior to Nov. of 1998).
Advertising brochure re: Crary Bear Cat Chippers, Chipper/Shredders, Vacuums & Stump Grinders for Home, Rental & Commercial Use (Sep. 1997).

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