| 摘要 |
A retractable spike system for providing traction when desired under the entire surface of a footwear sole and heel. Two or more retractable spike assemblies are inserted into cavities in the sole and heel of the footwear. The spikes on each assembly can be engaged by a cam or wedge pressing on a carrier plate. All the assemblies are connected together by a rigid coil attached to the cams or a shaft to which the wedges are fixed, in such a manner that a single mechanism can simultaneously retract or extend all the spikes on all assemblies.
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