Long-distance ski-track ploughing device

Claim 1

In a long-distance ski-track-ploughing device comprising a track sled adapted to be towed by a vehicle in the direction of the track, tracking elements on the underside of said sled oriented in the direction of the track, a forward sled joined to the track sled by means of a connecting frame, means pivotally connecting each sled to said frame to swing about a horizontal axis perpendicular to the direction of the track, and a scraper carried by said connecting frame perpendicular to the direction of the track and located between the said sleds, the improvement which comprises a plurality of lateral guides on the track sled, a plurality of vertical blades fixed to the underside of the forward sled oriented in the direction of the track, and additional runners fixed to at least a portion of said forward sled, said runners being so positioned that when said forward sled is swung about the means pivotally connecting it to said frame, from an operative position which its blade-carrying portion is substantially parallel to the track to an inoperative positon in which said blade-carrying portion is at an angle to the track, said blades and scraper lie above a plane containing the lowermost surfaces of said runners and said lateral guides.