GB204166A - Improvements in variable speed transmissions - Google Patents

Abstract

204,166. Marks, E. C. R., (Driscoll Patents Co.). July 19, 1922. Variable-speed and reversing gearing.-Reversible friction ratchet gearing which may be combined with a variable-speed linkage comprises pawls or impellers 91, 92, Fig. 4, adapted to drive a drum 97. These pawls are mounted upon eccentrics 93, 94, Fig. 1, at 180‹ apart upon a driving- sleeve 90 which is operated by an oscillating impeller arm 49, Fig. 2. The pawls are guided outwards into engagement with the drum as the eccentric begins to move, and are stopped from travelling with the drum at the end of a stroke, by pins 102 projecting from a plate 95 which is connected by a screw 84 of steep pitch to a seeve 82 which can be thrust longitudinally by a lever 89. Reversed driving is effected through this lever and screw so as to cause the pawls to become operative upon their opposite ends. In the variablespeed gear described, the ratchet mechanism is duplicated and is arranged upon a driven shaft 70 in line with driving- shaft 31. There is a clutch 25 for direct driving and a gear 24 for alternatively driving a countershaft 34 which drives through the variable linkage. Levers 42 are oscillated upon fixed pivots 43 by rods 40 connecting to cranks sliding in the slotted upper arms of these levers are connected by rods 47 to the impeller arms 49. The blocks 45 are moved to vary the speed by turning screws 60 in unison through toothed gearing 63.