Abstract: An improvement to gear systems, the improved gear system characterized by at least one gear-wheel (42c) provided about a shaft (34), the shaft (34) and the or each gear-wheel (42c) being provided with a actuable engagement therebetween in both rotational and counter-rotational directions (86, 88), such that engagement of the actuable engagement (86, 88) of the or each gear wheel (42c) in both the rotational and counter-rotational directions causes the or each gear-wheel (42c) to rotate in conjunction with the shaft (34) and prevents such from counter-rotating relative to the shaft (34), disengagement of the actuable engagement (86, 88) of the or each gear-wheel (42c) in both the rotational and counter-rotational directions allows the or each gear-wheel (42c) to rotate independently of the shaft (34) and counter-rotate relative to the shaft (34), engagement of the actual engagement (86, 68) in the rotational direction and disengagement of the actual engagement (86, 68) in the counter-rotational direction of th