Improvements in Pneumatic Tyres for Bicycles.

18,572. M'Giehan, I. S. Aug. 10. Tyres, pneumatic, preventing puncture of. A non-puncturable strip a is placed between the inner and outer covering on the tread. The strip a is made of raw hide gr other material wound helically and then flattened as shown in Fig. 2. Holes s are made through the protective strip in the position shown, so that the inner and outer coverings may be joined as shown at t, while the protective strip can stretch with the tyre. The strip is curved as shown in Fig. 5, so that its underside m becomes crimped at m<1>; its curvature is made greater than that of the tyre, to prevent it from becoming flat when in use. Thrust-pieces g may be provided for the ends c.