INSIDE TUBE FOR SPOKE FIXED NON-PNEUMATIC TIRE

摘要

A polyurethane non-pneumatic inner tube mounted on a conventional spoked bicycle tire rim having spokes projecting through the medial band thereof with spoke screw heads screwed onto the radial outer extremities of the spokes. The inner tube itself is preformed from an open cell polyurethane core (42) encased in a closed core skin (41) and is in the form of a donut shaped ring having an uncompressed cross section somewhat larger than the cross section of the interior cavity of the tire. Such inner tube also includes a continuous annular locking tongue (13) projecting radially inwardly from the ring for pressing engagement on its radially inner extremity with the screw heads of the spokes to thus frictionally hold such screw heads against unintentional rotation.