Abstract: A gear wheel construction for use in a constant mesh gear box, the gear wheel construction characterized by a single gear wheel (100) provided about a shaft (18) in a rotatable and engageable manner, the gear wheel (100) being divided longitudinally (axially) into two components, the first being a synchro-gear wheel (102) and the second gear being a partially toothed gear wheel (104), wherein the synchro-gear wheel (102) is provided in constant mesh with a gear wheel (106) forming its gear wheel pair whilst the partially toothed gear wheel (104is meshed therewith intermittently during rotation, the synchro-gear wheel (102) and the partially toothed gear wheel (104) having provided therebetween at least one biasing means (108) allowing momentary asynchronous rotation therein.

Abstract: A gear system characterized by providing at least one gear-wheel (58a) about a shaft (34), the shaft (34) having as least one pawl member (84) located therein, the or each pawl member (84) being caused to move into and out of engagement with a gear-wheel (48a) normally rotating freely with respect to the shaft (34) passing therethrough by the positioning of a roving magnet (48) withing the shaft, the engagement of the pawl member (84) with the gear-wheel (48a) thereby causing that gear-wheel (48a) to rotate with the shaft (34).