| 摘要 |
PURPOSE:To make the intersection angle between short links smaller and consequently facilitate the reduction of pitch between grips by a structure wherein special engaging members are provided at the connection part between the short links of pantograph-like link member units. CONSTITUTION:Engaging members 36 are provided at the connection part between the short links 19a and 19b of a link member unit 32 so as to be able to engage with the tooth face formed at the outer periphery of a sprocket 31, which is provided at the starting end of a pitch reduction interval. The intersection angle psi between the short links 19a and 19b can be made smaller without elongating the lengths of the short links 19a and 19b, resulting in enabling to dodge the development of improper length of pitch between grips 3. |
