as shown in fig1 the present invention consists of a base plate 25 and a fixing plate 20 , both symmetrically shaped in three pronged form and having three fixing holes 26 , 22 , respectively planted thereon for the disposition of rivets . in this manner , the present anti - slip means can be secured to the bottom of the shoe with the sole thereof disposed therebetween . said fixing plate 20 is structured to have a slightly upward bent press member 21 extended between its two symmetrically disposed ends , member 21 has a pin hole 23 placed at the end thereof for permitting the disposition of a pin 30 in association with the base plate 25 . pin 30 has a groove 31 planted at one side thereof for its attachment to a slip - proof member 10 when it is located with the top end thereof going through said pin hole 23 . there are two outside protrusions 24 plated at the two ends of said three pronged shaped fixing plate 20 , which are able to be in engagement with two apertures on said slip - proof member 10 so that the member 10 can be located in place without moving relatively to the right and left in use . said slip - proof member 10 is provided with protruding tooth - like elements 101 , symmetrically along the two edges thereof , and a tongue 12 located at its front for ready turnover operation thereof . member 10 also includes a pair of parallelly - disposed protrusions 13 is fixed at the opposite end thereof with a transverse member 14 disposed therebetween which is engaged in said groove 31 of the pin 30 for effecting the pivotable turnover of the slip - proof member 10 . refer to fig2 a - 2d and fig3 in mounting the present anti - slip device to the bottom of a shoe , the base plate 25 is first receivingly secured at a place between the bottom and the inner of the shoe , with the pin 30 and the rivets ( not shown ), for joining purposes , being attached thereon , and said rivets are extended externally to such an extent that the fixing plate 20 can be fixed at the bottom of a shoe by way of said rivets . as shown in fig3 the slip - proof member 10 is pivotably secured to the pin 30 by putting the transverse member 14 thereof in said groove 31 . the assembled anti - slip device is able to be housed in a recess at the bottom of the shoe with its surface lying flush with the bottom of said shoe and the tooth - like elements 101 received in said concave recess for walking on a non - slippery surface . the tooth - like elements can alternatively be turned to be outwardly exposed for use against a slippery surface so as to increase the ground - grasping capacity of said shoe . the operating procedures of the present anti - slip means are as illustrated from fig2 a - 2d fig2 a shows the present anti - slip device 10 being in a non - use state . the tongue 12 is actuated outwardly to put said member 10 in an erected position as shown in fig2 b . this erected position is effected as a result of the transverse member 14 disposed at one end of said member 10 being mounted in said groove 31 of said pin 30 and serving as a pivot axis . said raised slip - proof member 10 is turned 180 degrees , as shown in fig2 c , so that the tooth - like elements outwardly exposed for use . the erected member 10 is pushed down and disposed in a horizontal manner with the tooth - like elements facing outwardly and the fixing apertures 11 are being engaged with said protrusions 24 of said fixing plate 20 as shown in fig2 d , so that the anti - slip device can be put into use in mounting climbing or walking on a slippery surface as a result of the effective ground - grasping capacity thereof .
the present disclosure is related to a foldable anti - slip device mounted at the bottom of shoes adapted for mountain - climbing and snow - walking use , which consists of a pivotable slip - proof member , outwardly exposed for effecting the purpose and retractably received in a concave recess when not needed .