GB190609792A - Improvements relating to Electric Ignition Devices for Internal Combustion Engines. - Google Patents

Abstract

9792. Gardner, T. H., and Gardner, E. April 26. Gas and like engines, igniting in. In electric ignition devices for internal - combustion engines, the speed of the magneto or generator is varied by a clutch arrangement, while further means are provided to alter the time of ignition. On the armature shaft a are mounted two spur - wheels b, c adapted to engage with two spur - wheels d, f respectively. The latter wheels are mounted free to rotate on a countershaft e, which also carries loosely a clutch j, having two spring-pressed pawls m, i arranged to gear with teeth on the wheels d, f. By means of the throw-over lever q, the clutch rotates with either of the wheels d, f, thus, by reason of the difference in the sizes of the four wheels b, c, d, f, giving to the magneto the desired variation in speed, between starting and continuous running. The clutch receives its rotary motion by the engagement of a spur - wheel o, formed on the clutch, with a wheel p mounted loosely on the engine shaft v, this wheel also driving the cam shaft for the operation of the electrodes or commutator shaft. On an extension to the wheel p is formed a helical tooth u ; a spring- pressed pawl x, Fig. 2, carried on a feather-keyed disk w driven from the engine drives the wheel p, and by sliding the disk w along the shaft the timing of ignition may be altered. If the engine is reversed, owing to this pawl connexion reverse rotation of the cam shaft is obviated. The pawl may be on the wheel p and the helical tooth on the disk w, while the disk w may be fixed on the shaft v, the wheel p and extension t sliding thereon.