Vehicle drum brake avoiding anchor pin seizure - has aperture in web provided with radial and flat sections to engage pin of same shape

摘要

The brake shoe has one or two webs, having, in the end opposite to that actuated by the cam, an aperture slidably engaging the anchor pin. The pin can have lateral flats parallel to each other and equidistant from the centre of the pin, formed at both ends. The web(s) of the shoe present a U-shaped aperture having a radial section, which abuts the radial section of the pin, between two lateral and radial section. In the assembled brake, these engage with the lateral flats of the anchor pin. The two parallel flats of the aperture in the end of the shoe are directed so that, when the shoes are mounted, the parallel flats will form an angle with a line passing through the anchor pin centre and brake assembly centre.