Patent ID: 7730641

Claim:
A snowplough comprising: a body; a longitudinal colter; a flexible suspension which suspends the colter to the body such that the colter is in contact with the surface to be ploughed and is set into a tilted cutting angle; a fixed blade which is an upwards extension of the colter; a spring organ which is detachably attached to the colter and which backs up the colter to enable the colter to dodge an obstacle by backing up against the spring organ; a moving plate attached to and extending the colter toward the blade; a cover plate in front of the fixed blade; a mounting space formed between the fixed blade and the cover plate whereby the moving plate is fitted to glide in the mounting space back up towards the fixed blade and then back down; and wherein the spring organ includes at least two U-shaped leaf springs, each U-shaped leaf spring extending in a longitudinal direction along the colter and having a U-shape in a cross section parallel to the cutting angle, one leg end of each U-shaped leaf spring being attached to the body and the other leg end being attached to the colter such that the two U-shaped leaf springs together work essentially as straight-through mechanisms to back up the colter.