DOUBLE CRANK DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a double crank device capable of substantially assuring an inter-shaft distance between an input shaft and an output shaft without producing any large-sized device.SOLUTION: A double crank device is a cascade linkage of double crank mechanisms DC1 to DC4 related to the same configuration in four stages. Each of the double crank mechanisms DC1 to DC4 has two shafts of horizontal shafts 4a to 4d and horizontal shafts 4b to 4e. The two shafts have an inter-shaft distance corresponding to a link length [a] of bearings 2a to 2d and bearings 2b to 2e acting as fixed segments [a first link] and keep a parallel state. They have second links 5a to 5d [a link length b] acting as prime mover crank for horizontal shafts 4b to 4e, third links 6a to 6d [a link length c] acting as opposite side links of the first link, and fourth links 7a to 7d [a link length d] as a driven crank of the horizontal shafts 4a to 4d. A size relation among link lengths is a