Patent ID: 7784833

Claim:
A pair of roller skis each comprising a long and narrow board made of an elastic material; boot fixtures installed on the central upper face of a central portion of said board in a longitudinal direction thereof; at least two pairs of rollers disposed side by side and parallel on a central lower face of said central portion of said board so as to be directed in a rotating direction in the longitudinal direction of said board while having a left-right spacing corresponding to a width of said board and having a front-rear spacing shorter than a front-rear length of a boot secured to said boot fixtures, thereby to form a rectangular ground contact plane in which the ground contact points of said rollers serving as front wheels and said rollers serving as rear wheels are used as the apexes thereof; and two casters, a direction of which is changeable as desired, one being disposed on the lower face of a top portion of said board and the other being disposed on the lower face of a tail portion of said board, wherein when said board is placed on the ground with no load applied thereto, only the rollers of said front and tail casters make contact with the ground and said two pairs of rollers at the central portion are away from the ground, when load is applied to the central portion of the board on which said boot fixtures are secured, said two pairs of rollers receiving the load simultaneously come into contact with the ground, thus forming a rectangular ground contact plane in which ground contact points of said rollers serving as front wheels and said rollers serving as rear wheels are used as apexes thereof, and said casters, disposed at the top and tail portions of the board and constantly in touch with the ground irrespective of tilt of the board, elastically support, by a repulsive force of the board, the load applied to each of said casters, said casters changing direction thereof upon side slipping of the board so as not to hinder the side slipping movement.