Anti-slip device having retractable spikes

Abstract

A device for slip-damping effect, comprising a sole unit and a spike with a resilient, circumferential fastening which allows the spike to be tilted in case of shearing motion against the ground surface, wherein the device provides grip on hard ground surfaces as a result of the sole unit, and at the same time the risk of slipping on hard, slippery ground surfaces is reduced by the spike.

1 . A slip-damping device for use as a cover for, or incorporated in, a shoe, the slip-damping device comprising
 a sole unit,   a resilient, circumferential fastening in said sole unit,   at least one spike having a top part and a projecting part, which projecting part is made of a hard material which is suited to gripping in a ground surface in case of slipping, said spike suspended from the resilient, circumferential fastening in said sole unit, said spike being arranged such that said projecting part extends out from the sole unit   
       wherein in said sole unit there is defined a cavity adjacent the top part of the spike, said resilient, circumferential fastening arranged to bias said spike to extend from the sole unit, so that said spike can be received by said cavity when said sole unit is pressed against the ground surface such that a force is applied to said projecting part, said resilient, circumferential fastening adapted to allow tilting of said spike in case of shearing motion against the ground surface, and in that said resilient, circumferential fastening is adapted to allow spring-back of said spike to extend from the sole unit when said force decreases. 
     
     
         2 . The slip-damping device according to  claim 1 , wherein said hard material is a hard plastic. 
     
     
         3 . The slip-damping device according to  claim 1 , wherein said hard material is a metal. 
     
     
         4 . The slip-damping device according to  claim 1 , wherein said hard material is a ceramic. 
     
     
         5 . A slip-damping device for use as a cover for, or incorporated in, a shoe, comprising
 a sole unit,   a resilient, circumferential fastening in said sole unit,   at least one spike having a top part and a projecting part ( 4 ), which projecting part is suited to gripping in a ground surface in case of slipping, the spike suspended from the resilient, circumferential fastening, said spike being arranged such that said projecting part extends out from the sole unit,   
       wherein in said sole unit there is defined a cavity adjacent the top part of the spike, wherein said resilient, circumferential fastening is arranged to bias said spike to extend from the sole unit, so that said spike can be received by said cavity when said sole unit is pressed against the ground surface such that a force is applied to said projecting part, wherein said resilient, circumferential fastening is adapted to allow tilting of said spike in case of shearing motion against the ground surface, wherein said resilient, circumferential fastening is adapted to allow spring-back of said spike to extend from the sole unit when said force decreases. 
     
     
         6 . The slip-damping device according to  claim 1 , wherein said cavity has a depth (D 1 ) at least corresponding to the vertical distance (D 2 ) between an outermost tip of the projecting part of said spike and a plane defined by an underside of said sole unit. 
     
     
         7 . The slip-damping device according to  claim 6 , wherein the top part of the spike has a width (D 3 ) such that, when said spike is tilted, said top part is pressed down by a surface of the sole unit defining the cavity, so that said projecting part is pressed down through the plane defined by the underside of the sole unit. 
     
     
         8 . The slip-damping device according to  claim 1 , wherein said sole unit is a cover adapted to be arranged on a shoe 
     
     
         9 . The slip-damping device according to  claim 1 , wherein said device is arranged in a shoe, the sole unit being incorporated in the outer sole of the shoe. 
     
     
         10 . The slip-damping device according to  claim 1 , wherein said device is suited to fitting on a ferrule for use for a crutch or stick, said sole unit being incorporated in the sole unit of the ferrule. 
     
     
         11 . The slip-damping device according to  claim 1 , wherein said device comprises a plurality of said spikes, suspended from a plurality of said resilient, circumferential fastening, arranged spaced from one another. 
     
     
         12 . The slip-damping device according to  claim 1 , wherein said spike has a circular cross section. 
     
     
         13 . The slip-damping device according to  claim 1 , wherein said circumferential fastening in said sole unit is an annular flange. 
     
     
         14 . The slip-damping device according to  claim 13 , wherein said spike comprises a groove portion, the groove portion having a groove extending along at least partially the circumference of said spike, the groove adapted to enclose said annular flange.