Earth working – Automatic power control – Motive power control
Reexamination Certificate
2008-07-24
2011-11-08
Winner, Tony H. (Department: 3611)
Earth working
Automatic power control
Motive power control
C180S242000, C180S243000, C180S305000, C180S307000, C180S308000
Reexamination Certificate
active
08051916
ABSTRACT:
A rear wheel drive assist for a wheel tractor scraper, the wheel tractor scraper having a tractor portion with a power source operatively connected to the front driven wheels, and a rear, scraper portion having a bowl, work tool, and first and second rear wheels, the rear wheel drive assist includes a work tool pump fluidly connected to a work tool motor to drive the work tool, fluid operated drive motors operatively connected to the rear wheels, and a diverter valve selectively movable between a first position that delivers fluid flow from the pump to the work tool motor, and a second position that delivers fluid flow from the work tool pump to the rear wheel drive motors.
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Displacement Change, Poclain Hydraulics, Poclain Hydraulics Training Center, available at http://www.poclain-hydraulics.com/portals/0/self%20training/Changement%20de%20cylindree—GB.pdf.
Office Action mailed Aug. 19, 2010 in U.S. Appl. No. 12/179,186.
Bright C. Erik
Daniel Steven A.
McManus Bradley J.
Sergison Daniel P.
Thomson Norval P.
Braunstein Michael D.
Caterpillar Inc.
Knutson Jacob
Winner Tony H.
LandOfFree
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