the walking sole shown in its entirety in fig1 is designed especially to be incorporated into a golf shoe ( 2 ), shown in fig2 . this walking sole ( 1 ) is molded using a relatively rigid plastic material . according to the invention , the front part of the walking sole has particular transverse flexibility in relation to the place where the front part of the golfer &# 39 ; s foot gains its support , which facilitates the rotation of the foot during the swing . for this purpose , the walking sole ( 1 ) has , in its front part and at least along its outer edge ( 1a ), a combination of two materials having different degrees of elasticity . more precisely , the walking sole ( 1 ) is made up of two parts a and b made of plastic materials having two different degrees of elasticity . the largest portion of the walking sole ( 1 ) is molded using a relatively rigid plastic material and it has , along the front part of its outer edge ( 1a ), a molded part b of a plastic material of an essentially elastic nature or having a degree of elasticity clearly superior to that of the plastic material making up the major part a of the sole . the relatively elastic plastic material used in the molded layer b fills in a series of grooves ( 3 ) which are spaced at intervals and which are formed during the molding of the main part a of the sole . these grooves end on the edge ( 4 ) of the part a and extend in the direction of the median longitudinal plane of the sole , with the same relative position or with different positions , as indicated in fig1 and 2 . the grooves ( 3 ) may be marked off by parallel or convergent sides in the direction of the median longitudinal plane , so as to create a triangular shape . in the grooves ( 3 ) are thus formed individual elastic filling pieces ( 5 ) which may be joined by a border ( 6 ) created by molding at the same time as the individual elastic filling pieces ( 3 ). in other words , the molded part b made of elastic material is formed , according to the embodiment shown in fig1 and 2 , by the continuous border ( 6 ), which actually makes up a part of the exterior edge ( 1a ) of the walking sole ( 1 ), and by the individual elastic filling pieces ( 5 ) which constitute a kind of teeth closely embedded in the grooves ( 3 ) of the part a made of more or less rigid plastic material . the grooves ( 3 ) of part a of the walking sole form the boundaries of the tongues ( 7 ) making up the main molded section a , made of a rigid material . these tongues are flexible transversally around lines x extending through the internal ends of the grooves ( 3 ). to these tongues ( 7 ) may be attached the cleats ( 8 ) extending downwardly to ensure anchoring of the shoe ( 2 ) in the ground . the individual elastic filling pieces ( 5 ) may have either the same thickness as that of the rigid section a of the sole at the place where the grooves ( 3 ) are formed , or a smaller thickness , so that each elastic filling piece partially fills the groove ( 3 ) in which it is embedded , or a greater thickness , in which case it protrudes above the groove ( 3 ). the flexible tongues ( 7 ) may have the same thickness as the individual elastic filling pieces ( 5 ), as indicated in fig3 and 4 , or a smaller thickness . in this case , each tongue ( 7 ) may extend toward the outside from its starting place in the lower part of the edge of the main section a of the sole , made of rigid material , as indicated in fig5 and 6 ; it is , in this case , covered with elastic material b . in the embodiment shown in fig7 the flexible tongue ( 7 ) extends toward the outside from its starting point in the upper part of the rigid main section a of the sole , and in this case it covers a portion of the border ( 6 ) made of elastic material b . in the embodiment shown in fig8 the flexible tongue ( 7 ) extends toward the outside at mid - thickness of the main section a and it is thus overlapped by the plastic material b which extends above and below it . in the embodiment shown in fig9 each flexible tongue extends up to the outer edge of the sole and the individual elastic filling pieces ( 5 ) are separated . here again , the flexible tongues ( 7 ) may have the same thickness as that of the main section of the sole a , as shown in fig1 , or a lesser thickness as shown in fig1 , 12 , and 13 , in which it is evident that the flexible tongue ( 7 ) is found in the lower part , the upper part , and the middle part , respectively , in relation to the thickness of the sole . the lines of flexion x ( fig1 ), by which the different flexible tongues ( 7 ) are attached to the rest of the sole , may be made up of the areas of reduced thickness of the sole . these areas of reduced thickness may exhibit a progressive , or an abrupt , variation in thickness . in the first case , each of the areas is formed by an area which grows progressively smaller . in the second case , each area of reduced thickness is bounded by a groove ( 10 ) ( fig1 and 15 ), which is formed in the upper surface of the sole and which is more or less parallel to the edge of the sole , passing through the internal ends of the various grooves ( 3 ). however , this groove ( 10 ) may , as well , be set in the lower surface of the sole , or else the sole may have two grooves ( 10 ) on the upper and lower surfaces , respectively , these grooves being set in the same vertical plane in order to mark off between them an area of reduced thickness which facilitates the flexion of the tongue ( 7 ). fig1 and 15 illustrate a walking sole with a groove ( 10 ) in its upper surface , having several flexible tongues ( 7 ) of which each one has a cleat ( 8 ), and grooves ( 3 ) extending up to the outer edge of the sole , so that the individual elastic filling pieces are separated . in the embodiment shown in fig1 , the sole has , in its outer edge ( 1a ), only two grooves ( 3 ) which define a single flexible tongue ( 7 ) equipped with several adjacent cleats ( 8 ). here again , the grooves ( 3 ) extend from the groove ( 10 ) to the outer edge ( 1a ) of the sole and are not joined by an external border . on the contrary , in the embodiments shown in fig1 and 18 , the individual elastic filling pieces ( 5 ) are joined by a border ( 6 ). in fig1 , the sole has several flexible tongues ( 7 ), each equipped with a cleat ( 8 ), while in fig1 , the sole has a single flexible tongue ( 7 ) having a series of adjacent cleats ( 8 ), as in the case of fig1 . the different cleats ( 8 ) may be attached to the flexible tongues ( 7 ) of the walking sole ( 1 ) during molding of the sole ; in this case , they are held firmly within the rigid plastic material which makes up the main section a . in the embodiment shown in fig1 , the cleat ( 8 ) is embedded by force in an anchoring piece ( 11 ) which is formed in the sole ( 1 ) during molding thereof . this anchoring piece ( 11 ) has a cavity on its lower surface ( 12 ) that receives and holds in place in an appropriate way the head of the cleat ( 8 ) embedded by force in that cavity . fig2 illustrates a golf shoe equipped with walking sole which conforms to the invention . although in the embodiments of the invention described above , the part b made of molded elastic material is only provided for on the side of the external edge ( 1a ) of the sole ( 1 ), it is evident that the sole may be equipped with a similar piece made of elastic material on the front part of its inner edge ( 1b ) or , simultaneously , on both edges ( 1a and 1b ).
a walking sole for sports shoes , particularly golf shoes , having , on at least one of its lateral edges , a series of substantially transverse grooves , filled with a material having a degree of elasticity superior to that of the material making up the sole . the grooves are provided in the front portion of at least one of the lateral edges which extends the length of the frontal area of the sole which provides support for the front part of the foot of the wearer of the shoe , and they mark the boundaries of at least one flexible tongue transversally around an axis of flexion joining the internal ends of the grooves . .