| 摘要 |
A spring-driven mechanism for toy microvehicles has a braking device for obtaining a slow unwinding of the spring. This has a rotary wheel where a movable mass is radially guided, and the mass under the effect of centrifugal force has a tendency to enter into contact with a fixed surrounding cover according to a pressure depending on the force. A faceted shaft is provided for winding up the spring and is operated by means of a specially designed wrench which on account of a large flat base rests during operation on the external face of the toy, thus avoiding a pendular movement taking place and causing the uncoupling of the wrench during winding.
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