| 摘要 |
1452415 Vehicle wheel rims MICHELIN ET CIE (COMPAGNIE GENERALE DES ETABS MICHELIN) 29 July 1974 [30 July 1973] 33462/74 Heading B7C A vehicle wheel rim 1 for use with a tubeless pneumatic tyre comprises a pair of tyre bead retaining flanges 9, 10, tyre bead seats 6, 14 adjacent the flanges, a base 5 between the seats 6, 16 and a well 8 to facilitate tyre fitting adjacent the flange 9 having a sidewall forming an extension of this flange, a removable flexible and extensible annular member 2 being fitted in the well 8 so as to fill the well and form the bead seat 14 and a rim portion 15 connecting the seat 14 to the base 5, at least the radially outermost portion of the member 2 being made of a material which is compressible without variation in total volume. In use seating of a bead 3 of a tyre on the seat 14 causes compression of the member 2 in the region of the seat which in turn results in radial expansion of the member 2 in the region of the portion 15 so that the latter forms an abutment restraining the bead 3 from axially inward movement. The well 8 may increase, Fig. 1, or decrease, (Fig. 5, not shown), in width from its base to its mouth, or may be of the same width throughout its depth (Fig. 4, not shown). Alternatively, Fig. 2, the wall of the well 8 adjoining the flange 9 may be formed with a shoulder 26, the member 2 being shaped accordingly to fit the walls of the well. Circumferential ridges or grooves 16 may, as shown in Fig. 1, be provided on the base of the well to prevent the member 2 twisting or turning on itself in the well. The member 2 may be a one-piece member of rubber or alternatively, as shown in Fig. 2, may be formed of a rubber layer 24 and a synthetic plastics layer 25. A tyre inflation valve may be fitted in a bore which extends through a wall of the well and through the member 2 to terminate at an opening in the portion 15 (Fig. 6, not shown). |
