Abstract: A speed changer for a bicycle includes a plurality of sprocket wheels provided on the hub of its rear wheel and having different diameters, a transmission chain, a movable member, a chain positioning frame supported rotatably on the movable member and carrying a guide pulley and a tension pulley for guiding the chain about one of the sprocket wheels while maintaining the chain under tension, and a spring having one end fastened to the movable member for urging the frame in the direction which enables the chain to be tensioned. The other end of the spring is engaged with a mechanism mounted for rotation relative to the frame and an adjustable coupling is provided between the mechanism and the frame to vary the spring force applied to the frame to thereby vary the spring tension applied to the chain.

Abstract: An apparatus for removing a casting from a die casting machine and transporting it to a predetermined location comprises a plurality of hydraulic cylinder and piston sets connected in series and arranged in parallel with each other for driving a product gripping and conveying mechanism 30 towards and away from the die casting machine, thereby reducing the installation space and the operating time. Preferably, the apparatus has a turning device 40 for rotating the removed casting, and the gripping and conveying mechanism is inclined from 5 to 20 degrees to facilitate the removal of the casting.

Abstract: A ladle of an automatic molten metal feeding apparatus of a die-casting machine is supported by a pair of links which are driven in synchronism with a constant velocity relation whereby a lateral shift range of the pouring end of the ladle is regulated.