Patent ID: 6125556
Filing Date: 2000-10-03
Classification: A43B,A43C

Abstract:
A shoe, comprising:a sole;a reservoir arranged in said sole and containing a supply of an incompressible liquid; a plurality of slidable spike assemblies arranged in said sole and connected to said reservoir, said slidable spike assemblies including retractable spikes;a hydraulic pump arranged in said sole and connected to said reservoir and said slidable spike assemblies, said hydraulic pump pumping said incompressible liquid from said reservoir to said slidable spike assemblies under enough pressure to eject said spikes and to firmly maintain said spikes in a fully ejected position even when walking; anda first check valve connected between said reservoir and said hydraulic pump to restrict liquid flow in a single direction from said reservoir to said hydraulic pump, a second check valve connected between said hydraulic pump and said slidable spike assemblies to restrict liquid flow in single direction from said hydraulic pump to said slidable spike assemblies to eject said spikes, and a control valve connected between said slidable spike assemblies and said reservoir to enable said incompressible liquid to return to said reservoir to depressurize said slidable spike assemblies and retract said spikes.