Motor vehicles – Having four wheels driven – Including pump and fluid motor – or generator and electric...
Reexamination Certificate
2008-07-24
2011-11-22
Boehler, Anne Marie (Department: 3611)
Motor vehicles
Having four wheels driven
Including pump and fluid motor, or generator and electric...
C037S305000, C172S125000, C172S292000, C180S306000
Reexamination Certificate
active
08061466
ABSTRACT:
A wheel tractor scraper having a rear wheel drive assist, the wheel tractor scraper includes a tractor portion pivotally coupled to a rear scraper portion, the rear scraper portion having a bowl for hauling material and a fluid powered work tool configured to assist in loading the bowl, the work tool powered by a fluid pump connected to a fluid operated work tool motor. The rear wheel drive assist includes a fluid operated drive motor coupled to the rear wheels of the machine, a diverter valve having a first position at which fluid flow is delivered from the pump to the work tool motor and a second position at which fluid flow is delivered from the pump to the drive motor, and a controller being configured to control the diverter valve to engage the rear wheel drive assist. The machine may be operated by engaging the pump and work tool motor, and then actuating the diverter valve to the second position to divert flow from the work tool motor to the drive motor.
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Office Action mailed Sep. 16, 2010 in U.S. Appl. No. 12/179,267.
Displacement Change, Poclain Hydraulics, Poclain Hydraulics Training Center, available at http://www.poclain-hydraulics.com/portals/0/self%20training/Changement%20de%20cylindree—GB.pdf.
Carlton Douglas J.
Daniel Steven A.
Sergison Daniel P.
Stone Robert E.
Storer Corwin E.
Boehler Anne Marie
Braunstein Michael D.
Caterpillar Inc.
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