A GEAR SYSTEM WITH GEARS SELECTIVELY LOCKED WITH SHAFT

摘要

PCT No. PCT/AU97/00024 Sec. 371 Date Jul. 16, 1998 Sec. 102(e) Date Jul. 16, 1998 PCT Filed Jan. 17, 1997 PCT Pub. No. WO97/26468 PCT Pub. Date Jul. 24, 1997A 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).