Improvements in driving mechanism for pedal cycles and motor cycles of the chainlesstype

摘要

422,706. Cycle driving mechanism. ALLEN, T., 22, Cambridge Road, King's Heath, Birmingham. July 17, 1933, No. 20107. [Class 136 (ii)] In coupling-rod driving mechanism for cycles of the pedal or motor-driven type, the lengths of the coupling-rods can be varied and the position of the crank-pin on the driven crank adjusted. The means for varying the lengths of the coupling-rods comprise a right- and lefthanded screw F which is turned to bring the two parts N and C of the rod closer together or further apart, and then is secured against further movement by a binding-screw O. The crank pins J on the driven cranks A lie in a curved slot concentric with the axle D, and can be held in any desired position in this slot by opposite lock-screws and a nut on the pin. The cranks A may be disposed at an angle of 150‹ to one another to avoid fouling of the coupling-rods C at dead-centre, the pedal cranks B being correspondingly off-set, but the pedals E being mounted in line 180‹ apart. The rotation of the cranks A is conveyed to the road-wheel by a multiplying sun-and-planet gear consisting of a stationary wheel G1 having internal teeth, with which mesh pinions G2 mounted on a disc fixed to the cranks A. The pinions G2 engage also the teeth of a wheel G3 fixed to the road-wheel, and may impart one or more speeds thereto. Ball-bearing brackets enable the road-wheel to be removed for repairs without affecting the coupling-rod adjustments.