GB274571A - Improvements relating to variable speed gears and the like - Google Patents

Abstract

274,571. Farley, J. April 23, 1926. Clutches, friction; facilitating changing speed. -A friction clutch comprising wedging members such as rollers or balls and adapted to be disengaged by pins which register with a control cage is specially applicable to facilitate changing speed. Rollers 5, Figs. 1 and 2, when free to do so will jam in either direction between flats on a polygonal boss 4 and a cylindric friction surface 3 within a gear 2 loose on a shaft 1. The rollers 5 are carried in notches in a divided cage 6 which is supported on central webs 7 in an annular recess 11 in the boss 4. The clutch is shown in Fig. 1 engaged, the cage 6 being angularly displaced. To disengage the clutch, the cage 6 is forced to and held in a middle position. For this purpose, taper register pins 10, Fig. 2, which turn with the boss 4, are thrust into holes 8, Fig. 3, in the cage. The pins 10 are carried by a ring 9 operated by a control fork. The parts of the cage 6 are normally held apart by springs 13. The cage 6 has an external flange 14 with peripheral notches 14a which, in the engaged position, engage pins 15 on the gear face, and so help to lock the transmission rollers. A variablespeed gear according to Specification 221,323 is described with one such roller clutch, a difference being that the gear is disengaged when the clutch ring with the register pins is moved towards it. In Fig. 10 a clutch according to the invention is arranged on the countershaft of a variable-speed gear. When a gear change is to be made, a cam 32 on the control lever 31 causes the register pins 10 to be thrust home, so freeing the countershaft from drive and facilitating the change of mesh. In another form, the connection with the control of the main clutch upon a vehicle is described. Specification 275,530 also is referred to.