| 摘要 |
PURPOSE: A device for automatically controlling the elasticity of a chain is provided to be able to a manual and an automatic control, and to control the elasticity of the chain by raising a second pulley with the operation of a worm and a worm wheel. CONSTITUTION: A bracket installed in a body of two-wheeled vehicle is composed of digital C shaped upper end(1) and a soft capital gamma shaped downward plate(2), and the front, and upside and the lower side of the bracket installs or disjoints a connecting plate(3) with bolts(4)(4'). The body and the bracket are fixed with a nut by controlling the interval with the elevation of a vertical bolt(5) in the upper face. A first pulley having the same height with the height of a chain gear of body is installed in the rear face of the lower downward plate(2) of the bracket. A click(7) inclined in one direction by screwing in the bracket projected in a 1-lettered shape in front of the downward plate(2) vertically is butted with a racket gear as worm wheel(8) to rotate only in the one direction. The worm wheel(8) is butted with a worm to be able to be removed by a fixing pin(11) during driving with a decelerating motor(10). A second pulley(16) installed by the bracket(15) on the other end is elevated according to the rotation of the worm wheel(8) by fixing the one end of a crosswise elevating rod(14) in the rear face of the worm wheel(8).
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