Octree of objects in arbitrary motion: representation and efficiency

The seat has a base and a backrest with the backrest curving upwardly from the base. A pad of similar configuration is fixed to the base and the backrest. A pair of spaced leaf springs intervene between the pad and the seat in the zone where the base and backrest join. The seat is fastened to the cycle by means of a pierced post bracket. A longitudinal frame fixed to the seat base has spaced rails with pluralities of transversely aligned apertures in which a transverse rod may be selectively placed to locate the seat base with respect to the post bracket which is adapted to be secured to the seat post rising from the cycle frame. A forward clamp near the front end of the seat base clamps about a horizontal frame member of the cycle. The clamp restrains a strap secured in vertically spaced relationship to the bottom portion of the seat base. The strap adjustably restrains a forward portion of the post bracket. The frame rails extend rearwardly of the backrest to afford attachment of a combination of accessories, such as racks and bags, which may be attached to either or both of the backrest and the rails in addition to being supported by the rear axle or the rear wheel fork.

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