| 摘要 |
901,552. Pneumatic tyres. DUNLOP RUBBER CO. Ltd. June 18, 1959 [July 1, 1958], No. 20904/59. Class 144 (2). A pneumatic tyre has a reinforcement 5 confined to the bead regions 4 and side wall portions 5 and comprising a length or lengths 6 of inextensible filamentary material, such as steel cord, a portion of each length approaching and leaving the bead region substantially tangentially and being disposed in a circumferential plane. The reinforcement provides more even graduation of stiffness from the bead to the side wall and may be used either alone or in conjunction with a cord reinforced carcase and/or conventional wire bead cases. The reinforcement may comprise a plurality of evenly distributed separate lengths of steel cord which are either rectilinear, Fig. 3, concave or convex when viewed radially and the ends of which extend into the side walls for one quarter to one third the tyre section height. Alternatively, a single length of cord may be wound in a series of convolutions, Fig. 5, with each convolution being tangential to the bead region at one or more points, the tangential points of the convolutions being evenly spaced around the bead periphery. In a further arrangement, continuous closed rings of cord may be used. |
