243,184. Lindsay, H. Dec. 22, 1924. Expanding-pulley gearing.-Each pulley comprises a tread member 27 formed of a relatively short loop of wide V belt supported between conical flanges 25, 26, one or both of which is movable to change the effective diameter. A belt 35, or set of ropes, or a chain, passes over two such expanding pulleys, or over one expanding and one fixed pulley. The tread may be formed of cross wood pieces 47 secured to the underside of a band 48, as shown in Figs. 1 and 2. Or the cross pieces 47 may be of fibre and mav be secured both above and below the band as shown in Figs. 3 and 4. To provide for tensioning the transmission belt &c., a sprocket 31 is made adjustable, or a spring may be interposed. As applied to a vehicle, disconnection of the drive is provided for by allowing the tread member to fall on a loose sleeve on the driving- shaft. In one form, the pulley is rendered automatic by a centrifugal lever, like a governor. The application to a lathe is described. Specification 16117/99 is referred to.