Abstract: A roller contrivance for use with at least one foot, such as a roller skate (1), skateboard, roller ski or the like, comprising a base frame (2) and at least one row of mutually sequential rollers (3) mounted to the base. At least one of these rollers (3) is journalled in a holder (6) which is pivotally mounted to the base (2). The holder is able to pivot about an axis which forms a right angle with the rotational axis of the roller (3) and is located at a given distance from a roller center line (10) which passes through the roller journal point (8) and its point of contact (21) with the underlying surface.

Abstract: An ice-skate blade includes a central main runner and side-runners positioned on opposite sides of the main runner. The blade includes three zones separated in the longitudinal direction of the blade, namely an essentially central glide zone 8, 9, having one or more runners located on the same level, and a rear zone and a front zone having side-runners which extend on respective sides of the main runner and which are located at a higher level than the main runner, so as to grip the ice only when the blade is tilted. The side-runners extend along the full length of the main runner.

Abstract: An ice-skate blade construction comprising a central runner (5) and at least one side-runner (4) on each side of the main runner. The side runners are arranged so as to make engagement with the ice solely when the blade (2) is inclined so that the angle defined by the blade with the ice is less than 90 degrees by a predetermined value. In order to improve the gliding and manoeuvering properties of the skate blade, the main runner (5) has a discontinuous glide surface which includes at least one part (7) which is not intended to make contact with the ice and which is delimited by two parts that are.