Patent ID: 7730644

Claim:
Snow-plow assembly for a vehicle, wherein: the assembly includes a mainblade and a sideblade; the assembly includes a frame, which is structurally suitable for being attached solidly to the vehicle; the mainblade is pivoted to the frame, at a mainblade/frame pivot; the assembly includes an operable mainblade control, which is so structured as to enable an operator to forcefully direct the mainblade to pivot about the mainblade/frame pivot, relative to the frame, and thus to change a mainblade-angle at which the mainblade lies with respect to the frame; the sideblade is pivoted to the mainblade at a mainblade/sideblade pivot, located at or near one end of the mainblade; the assembly includes an operable sideblade control, which is so structured as to enable an operator to forcefully direct the sideblade to pivot about the mainblade/sideblade pivot, relative to the mainblade, and thus to change a sideblade-angle at which the sideblade lies with respect to the mainblade; the assembly includes a wheel-protecting blocker; the blocker includes a means for sensing the sum of the mainblade-angle and the sideblade-angle; the blocker is so structured as to be effective, responsive to sensing that the sum of those angles has exceeded a pre-determined value, to automatically block further pivoting of the sideblade, at least in the direction that would increase the sum of those angles.