GB190417416A - Improvements in combined Driving, Free Wheel and Brake Mechanism for Velocipedes. - Google Patents

Abstract

17,416. Rudge-Whitworth, Ltd., and Pugh, J. V. Aug. 10. Brakes ; driving-mechanism.-In the type of driving, free - wheel, and back - pedalling brake mechanism in which a nut or the like moves upon a screwed boss on, or attached to, the chain-wheel, the threads of the nut are made larger than those of the boss, so that the nut always lags behind, and consequently travels endwise along, the boss until the nut engages the brake or brake-operating device, or with the hub, according to the direction of rotation of the chain-wheel. In the form shown in Fig. 1, on commencing to drive, a doubleconed nut g, lagging behind the threaded boss h<2> of the sprocket-wheel h, is drawn into contact with the ball cone a<3>, when, its rotation being arrested, the nut is consequently drawn tightly into the cone and thus transmits the rotation to the hub. On back-pedalling, the nut again lags and now travels inwards until it engages a non- rotatable part c<2>, which the nut then quickly forces inwards to apply the Weston-clutch type of brake e, e<2>. The parts a<1>, a<2>, c, c<2>, e, e<2> are suitably ribbed, the notched sleeve d being ensured against rotation by engagement with a correspondinglynotched piece l on the chain stay of the bicycle. A number of modifications are described. On back-pedalling, the loosely-fitting nut may engage a rotatable ring having teeth adapted to engage similar teeth upon the end-plate of the Weston clutch, the ring and end-plate being connected by an involute spring ; or the nut may urge a wedge ring between the two parts of a non-rotatable hollow drum thereby expanded into contact with the hub ; or, as shown in Fig. 36, the nut g may have one end conical both internally and externally, so that, on back-pedalling, it engages a sleeve u recessed to receive an arm of a laminated lever v which expands a band w into engagement with a flange a<4> of the hub; or a band may be drawn tightly around the hub. In other arrangements, a screwed sleeve with teeth on its inner end is adapted to engage with teeth upon a non-rotatable conical brake drum and then to force the drum quickly into contact with the hub, or, as shown in Fig. 47, the drum y may be screwed to the sleeve g, so that, in driving, it rotates with the hub, but, on backpedalling. its rotary motion is arrested by a notched plate or by a plane or fluted cone d. The parts y, 1, and z are ribbed to prevent independent rotation but to allow of independent lateral motion. The spring n is in considerable initial compression. If desired, the rotation of the sleeve g may be arrested by engagement on its inner face with a tubular piece secured against rotation by ribs on a fixed part, or, on back-pedalling, the sleeve may engage an externally-threaded, rotatable sleeve on which a non-rotatable brake drum works.