Two-speed windup drive unit

摘要

A two-speed windup drive unit which can automatically switch and output two types of rotations with a spring being used as a power source. Switching gears 16 and 17 which move around one gear 10 in a gear mechanism 2 which transmits output rotations in order to disconnectably connect a constant speed mechanism 3 are provided in a long hole 23 which is arranged at a position crossing a movement trajectory of a switching member 6 which starts a linear movement simultaneously with start of outputting rotations and a position at which a force causing falling toward a pinion of the constant speed mechanism 2 by the gravitational force, the gears 16 and 17 are rapidly moved in a direction along which the gears 16 and 17 mesh with the constant speed mechanism 3 by the gravitational force and a revolving force generated by rotations of the gear 10 so that the constant speed mechanism is connected with the gear mechanism, and the gears 16 and 17 are disconnected from the constant speed mechanism 3 against the gravitational force and the revolving force by the switching member 6 when the gears 16 and 17 have moved by a fixed distance from start of outputting rotations. The drive unit may be used for driving a toy car or a doll.