| 摘要 |
A wear indicator for insertion in the lining (3) of a brake shoe (1) comprises an electric conductor surrounded by a synthetic casing (6). Securing of the synthetic casing in the lining is effected by gluing or cementing. The outer surface of end (7) of the synthetic casing is profiled to provide a surface pattern of at least one projection and/or recess providing discontinuities in the axial direction to assist retention. This pattern may consist of grooves or channels running in the shape of rings, screw-lines or spirals; or intersecting spirals. Pattern may be interrupted by areas (12) with reduced diameter. Pattern may arise as a result of localised indentation (see Fig. 7a). Production of pattern may be by means of heated die plates and can be carried out at same time as injection moulding. <IMAGE> |
