Snowplow

Abstract

A snowplow in which a snow blade has a central portion and two resilient portions on either end thereof and in which each end portion including a resilient moldboard and a resilient scraper blade as a combination is resiliently deflectable for deflection together forwardly relative to the central portion.

I claim:  
     
         1 . A snowplow comprising: 
 an elongate planar scraper blade,    a generally rectangular planar mouldboard, and    a central support structure,    the mouldboard having a front surface, a rear surface, a lower edge, an upper edge, a right end edge and a left end edge, with each edge spanning between the front surface and the rear surface,    the mouldboard having a height measured between the lower edge and the upper edge and a width measured between the right end edge and the left end edge, the mouldboard having a central portion between a right end portion and a left end portion,    the right end portion extending from the central portion to the right end edge, the left end portion extending from the central portion to the left end edge,    the central support structure secured to the rear surface of the mouldboard over the central portion between the right end portion and the left end portion,    the scraper blade mounted to the mouldboard proximate the lower edge and extending across the entire width of the mouldboard,    the combination of the scraper blade over the right end portion of the mouldboard and the right end portion of the mouldboard being resiliently deflectable for deflection together forwardly and rearwardly relative the central portion, and the combination of scraper blade over the left end portion of the mouldboard left and the end portion of the mouldboard the being resiliently deflectable for deflection together forwardly and rearwardly relative the central portion.    
     
     
         2 . A snowplow as claimed in  claim 1  wherein the central portion of the mouldboard being constrained by the support structure against substantial deflection.  
     
     
         3 . A snowplow as claimed in  claim 1  wherein the mouldboard comprises a sheet of plastic material.  
     
     
         4 . A snowplow as claimed in  claim 3  wherein the scraper blade comprises a resilient sheet of metal.  
     
     
         5 . A snowplow as claimed in  claim 3  wherein the mouldboard includes a reinforcing flange extending along the upper edge.  
     
     
         6 . A snowplow as claimed in  claim 1  wherein in vertical side view, the front surface of the mouldboard is concave forwardly.  
     
     
         7 . A snowplow as claimed in  claim 1  wherein the scraper blade over the right end portion and the right end portion of the mouldboard is resiliently deformable to an extent that a point of the junction of the lower edge and the right end edge may be deflected rearwardly a distance equal to ⅝ of the width of the right end portion without permanent deformation of the snowplow.  
     
     
         8 . A snowplow as claimed in  claim 1  wherein the scraper blade over the right end portion and the right end portion of the mouldboard is resiliently deformable to an extent that a point of the junction of the lower edge and the right end edge may be deflected rearwardly a distance equal to {fraction (5/4)} of the width of the right end portion without permanent deformation of the snowplow.  
     
     
         9 . A snowplow as claimed in  claim 1  wherein the scraper blade over the left end portion and the left end portion of the mouldboard is resiliently deformable to an extent that a point of the junction of the lower edge and the left end edge may be deflected rearwardly a distance equal to ⅝ of the width of the left end portion without permanent deformation of the snowplow.  
     
     
         10 . A snowplow as claimed in  claim 1  wherein the scraper blade over the left end portion and the left end portion of the mouldboard is resiliently deformable to an extent that a point of the junction of the lower edge and the left end edge may be deflected rearwardly a distance equal to {fraction (5/4)} of the width of the left end portion without permanent deformation of the snowplow.