Multiblade snowplow vehicle

Claim 1

A multiblade snowplow vehicle comprising a chassis supported on wheels, a front mounted blade attached to said chassis, a rear blade attached to said chassis, said rear blade being essentially flat and substantially perpendicular to the path of travel of the vehicle to allow the clearing operation to begin immediately adjacent an obstacle, said rear blade also being essentially free of obstruction along the pulling face toward the vehicle, pivotal support frame means on said chassis for said rear blade to attach the same to the snowplow vehicle, horizontal pivot means on said chassis to mount said frame means, said frame means including side arm means positioned laterally outward of the vehicle to avoid interference during pivotal movement, said side arm means being of sufficient length to pivotally position said rear blade over the vehicle to be within the longitudinal confines thereof to allow ease of positioning said vehicle, an activating means for said frame means including a transverse actuating bar member, a fluid cylinder affixed to said motor vehicle, said actuating bar member connected to said cylinder means by means of a crank member, and control means positioned on the vehicle, said control means actuating said cylinder to lift and lower said rear blade through pivotal action, whereby said rear mounted blade may be activated and used separately from said front mounted blade, said support frame means being triangular shaped with at least two outwardly extending support arms, and adjustment means to allow alteration of the angle formed by said rear blade and the ground by varying the length of one of the arms of said triangular frame, said rear plow blade including essentially vertical flanges whereby said triangular frame is integrally attached to said blade, said flanges having a plurality of apertures to form said adjustment means to allow variation iN the pitch angle between the blade and the surface to be cleared, said triangular support frame means being provided with a plurality of apertures in the lower arm of said triangular support member to further form said adjustment means and allow variation of said blade pitch angle.