Moulded shoe bottom with high anti-shock ventilation properties

Abstract

The present invention relates to a shoe bottom moulded from one piece, which is provided with a first and second chamber ( 3, 30 ), which do not communicate, which respectively house elastically flexible protuberances ( 2, 40 ), which are able to generate both an “anti-shock” action for the foot and a pumping action to create forced air ventilation inside the shoe.

1 . Moulded shoe bottom, of the type provided with a lower tread ( 1   a ), a heel (T) and an upper plant ( 1   b ) with a dense series of protuberances ( 2 ) that project from the bottom wall of a first cavity ( 3 ), having the same surface as the half plant of the bottom, each protuberance ( 2 ) having a vertical stem ( 2   a ) with a circular hollow section, bottom ( 1 ) characterised in that each protuberance ( 2 ) has a mushroom configuration that includes an enlarged head ( 2   b ) and the heel (T) is provided with a second cavity ( 30 ), from which a collar ( 40 ) with basically rectangular section and rounded corners projects in central position. 
     
     
         2 . Bottom as claimed in the  claim 1 , characterised in that said collar ( 40 ) comprises lateral walls ( 40   a ) and said collar ( 40 ) ends on top with an internal flange ( 41 ) with lower thickness than the lateral walls ( 40   a ) of the collar ( 40 ). 
     
     
         3 . Bottom as claimed in  claim 1 , characterised in that the head ( 2   b ) of the protuberances basically consists in a sort of annular flange with square shape and rounded corners. 
     
     
         4 . Bottom as claimed in  claim 1 , characterised in that the thickness of the head ( 2   b ) is not constant and is tapered away from the centre. 
     
     
         5 . Bottom as claimed in  claim 1 , characterised in that all the protuberances ( 2 ) are situated in parallel position in such a way that very narrow empty spaces, preferably lower than 2 mm, are left between the enlarged heads ( 2   b ) with longitudinal or transversal direction. 
     
     
         6 . Bottom as claimed in  claim 1 , characterised in that the first cavity ( 3 ) is surrounded by a flat perimeter band ( 5 ) that runs along the entire edge of the bottom ( 1 ). 
     
     
         7 . Bottom as claimed in  claim 1 , characterised in that said lateral wall ( 40   a ) of the collar comprise a lower section ( 40   a ′) and an upper section ( 40   a ″) and the second cavity ( 30 ) is provided with a series of stiffening elements ( 42 ) extending between the internal wall of the cavity ( 30 ) and the external wall of the collar ( 40 ) and in that the height of the said stiffening elements ( 42 ) decreases from the outside to the inside of the heel, in such a way to give high rigidity to the lower section ( 40   a ′) of the lateral wall ( 40   a ), whose upper section ( 40   a ″) is provided with higher elastic  5  flexibility. 
     
     
         8 . Bottom as claimed in  claim 1 , characterised in that the cavities ( 3  and  30 ) do not communicate and use the same air valve ( 50 ,  500 ), which consists in a valve that comprises at least one outlet and two inlets in opposite position. 
     
     
         9 . Bottom as claimed in  claim 8 , characterised in that the bottom ( 1 ) is provided in the plantar arch with a central housing ( 10 ) designed to contain the air valve ( 50 ,  500 ). 
     
     
         10 . Bottom as claimed in  claim 8 , characterised in that the valve ( 50 ) has a Tshaped configuration comprising a vertical wing and an horizontal wing provided with two inlet conduits ( 52 ) in opposite coaxial position that, being oriented one after the other, form a single conduit ( 53 ) that intersects a vertical outlet conduit ( 51 ) obtained in the vertical wing of the T-shaped valve ( 50 ). 
     
     
         11 . Bottom as claimed  claim 10 , characterised in that the valve ( 50 ) comprises a pre-compressed spring ( 54 ) contained inside the said conduit ( 53 ) in intermediate position between closing means ( 55 ) that close the inlet conduits ( 52 ) respectively. 
     
     
         12 . Bottom as claimed in  claim 8 , characterised in that the valve ( 500 ) has a T-shaped configuration, comprising an horizontal wing and a vertical wing provided with two separate outlet conduits ( 51   a  and  51   b ) in parallel position that communicate with corresponding air inlet conduits ( 52   a  and  52   b ) in opposite position on the horizontal wing of the T-shaped valve ( 500 ). 
     
     
         13 . Bottom as claimed in  claim 13 , characterised in that the air inlet conduits ( 52   a  and  52   b ) are closed by closing means ( 55 ) subjected to the 30 action of corresponding springs ( 53 ). 
     
     
         14 . Bottom as claimed in  claim 10 , characterised in that the housing ( 10 ) of air valve ( 50 ,  500 ) communicates with the cavities ( 3  and  30 ) by means of corresponding longitudinal channels ( 61  and  62 ), while the bottom of the housing ( 10 ) is provided with a vertical through conduit ( 63 ) that exactly houses the vertical wing of the T-shaped valve ( 50 ,  500 ).