Background Art Generally, outsoles of footwear, including dress shoes, athletic shoes and so on, are made of synthetic resin material. Such synthetic resin outsoles are effective to relieve shock produced during walking.

The synthetic resin outsoles, however, have poor traction, especially on slippery roads such as snowy or icy roads, thereby causing injury to walkers.

To solve the above problem and prevent the skidding of shoes, therefore, various kinds of skid-proof shoes are known.

Next, one example of known skid-proof shoes is described.

Fig. 5 illustrates"a skid-proof shoe"disclosed in a utility model application filed in the Korean Industrial

Property Office as Serial No. 1992-24713. The skid-proof shoe is configured in such a fashion that a downwardly-opened tap hole 101 is formed at an outsole 100 of the shoe, and a bolt 102, having a driver groove at its lower end, is adapted to be screwed into the tap hole 101.

For use in walking on ordinary roads, the bolt 102, previously screwed inside the tap hole 101, is further screwed thereinto, using some special tools such as a driver and so on, thereby being sunk inside the tap hole 101. On the other hand, for use in walking on snowy or icy roads, the bolt 102 is unscrewed and lowered using the driver, thereby causing the lower end of the bolt 102 to be protruded downwardly from the lower surface of the outsole 100. In this way, the skidding of the shoe is prevented.

The conventional skid-proof shoe as stated above, however, has a problem that the user experiences considerable inconvenience in the course of causing the bolt to be protruded or sunk. This is because the user has to directly rotate the bolt, screwed in the tap hole, using tools such as the driver in order to raise or lower the bolt.

In addition, in a state wherein the bolt is protruded downwardly from the outsole, a weight of the user is concentrated on the bolt, thereby causing damage to screw threads formed at the bolt or tap hole. This damage makes the screwing operation of the bolt impossible.

Disclosure of the Invention Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a skid-proof shoe, which is configured in such a fashion that an outsole thereof is formed with a receiving groove made of magnetic material and an attachment spike is adapted to be easily attached inside the receiving groove as occasion demands.

It is another object of the present invention to provide a skid-proof shoe, which is configured in such a fashion that a plurality of triangular prominent spike blades are formed around the lower end of an attachment spike, thereby maximizing a skid-proof effect of the shoe during walking on slippery roads such as snowy or icy roads.

In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of a skid-proof shoe comprising: at least one fixed bracket integrally embedded in an outsole of the shoe, the fixed bracket having a downwardly-opened receiving groove and being made of magnetic material; and at least one attachment spike inserted into the receiving groove and adapted to be protruded downwardly from the outsole, the attachment spike being provided at its upper side with a detachable magnet

adapted to be attached to a top surface of the receiving groove.

Brief Description of the Drawings The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: Fig. 1 is a perspective view illustrating the bottom of a skid-proof shoe in accordance with the present invention; Fig. 2 is an exploded perspective view illustrating the bottom of the skid-proof shoe in accordance with the present invention; Fig. 3 is an enlarged sectional view taken along line A- A in Fig. 1; Fig. 4 is an exploded perspective view illustrating an ordinary use state of the shoe in accordance with the present invention; and Fig. 5 is an exploded perspective view illustrating a conventional skid-proof shoe.

Best Mode for Carrying Out the Invention Fig. 1 is a perspective view illustrating the bottom of

a skid-proof shoe in accordance with the present invention, and Fig. 2 is an exploded perspective view illustrating the bottom of the skid-proof shoe in accordance with the present invention. First, the configuration of the skid-proof shoe will be described as follows.

The skid-proof shoe comprises at least one fixed bracket 2, and at least one attachment spike 3. The fixed bracket 2 is integrally embedded in an outsole 1 of the shoe, and defines a downwardly-opened receiving groove 211 therein. In addition, the fixed bracket 2 is made of certain magnetic material. The attachment spike 3 is inserted into the receiving groove 211 and adapted to be protruded downwardly from the outsole 1. The attachment spike 3 includes a detachable magnet 311, which is provided at the upper side thereof and adapted to be detachably attached to the top surface of the receiving groove 211.

The fixed bracket 2 is embedded in the outsole 1 so that the receiving groove 211 defined therein is hollowed inwardly relative to the lower surface of the outsole 1.

The attachment spike 3 is adapted to be selectively attached or detached to or from the outsole 1. Therefore, in the case of ordinary use, the attachment spike 3 may be stored in a separate place.

Now, the skid-proof shoe constructed as stated above will be explained in detail with reference to Fig. 3. Fig. 3

is an enlarged sectional view taken along line A-A in Fig. 1.

As shown in Figs. 2 and 3, the fixed bracket 2 is constructed by integrally coupling a circular ring 21 with an upper horizontal plate 22. The circular ring 21 defines the downwardly-opened receiving groove 211, and the upper horizontal plate 22 is adapted to cover the top of the circular ring 21. The upper horizontal plate 22 is provided at its both sides with outwardly-extended protrusions 221.

These outwardly-extended protrusions 221 are formed with a plurality of perforated holes 222, respectively, through which synthetic resin material is passed in the manufacture of the outsole 1. This configuration enables the fixed bracket 2 to be firmly fixed to the outsole 1.

The attachment spike 3 is constructed by integrally coupling an upper circular ring 31, a lower plate 32 positioned at the bottom of the upper circular ring 31, and a spike unit 33 provided along the outer periphery of the lower surface of the lower plate 32. The upper circular ring 31 is positioned at the upper portion of the attachment spike 3 and adapted to be inserted into the receiving groove 211. In addition, the upper circular ring 31 contains the detachable magnet 311. The detachable magnet 311 is fixed inside the upper circular ring 31 such that its upper surface is exposed to the outside. The spike unit 33 has a plurality of prominent spike blades 331 provided at a bottom side thereof.

Especially, each of the prominent spike blades 331 has an inverted triangle pointing downward.

The attachment spike 3 is formed around its middle region with a middle projecting rim 34. The middle projecting rim 34 is adapted to come into close contact with the lower end surface of the circular ring 21 at its upper surface, thereby preventing the attachment spike unit 33 from being completely inserted into the receiving groove 211 defined in the fixed bracket 2.

Fig. 4 illustrates a state wherein the shoe of the present invention is for use on ordinary roads. During walking on ordinary roads except snowy or icy roads, the attachment spike 3, inserted into and attached inside the receiving groove 211 of the outsole 1, is removed from the receiving groove 211.

Then, a synthetic resin made cap 4, molded into the same shape as that of the receiving groove 211, is inserted into the receiving groove 211. By virtue of the synthetic resin made cap 4 filling the receiving groove 211, the receiving groove 211 is protected from the invasion of impurities, such as soil and the like on the roads, during walking.

Now, the operation of the present invention constructed as stated above will be described as follows.

As shown in Figs. 1 to 4, in the case of use on ordinary roads, the shoe of the present invention is used in a state

wherein the synthetic resin made cap 4 is inserted into the receiving groove 211 hollowed in the outsole 1 for filling the receiving groove 211, as stated above. This prevents impurities, such as soil and the like on the roads, from entering into the receiving groove 211 during walking.

In the case of use on snowy or icy roads, first, the synthetic resin made cap 4, inserted in the receiving groove 211 of the fixed bracket 2, is removed from the receiving groove 211.

Then, the attachment spike 3 is inserted into and attached inside the receiving groove 211, so that the spike unit 33 provided at the lower portion of the attachment spike 3 is protruded downwardly from the lower surface of the outsole 1.

In this state, the lower surface of the upper horizontal plate 22, positioned at the upper portion of the receiving groove 211, is attached to the upper surface of the detachable magnet 311 provided in the attachment spike 3. Therefore, the attachment spike 3, inserted in the receiving groove 211 of the fixed bracket 2, is firmly fixed.

The upper horizontal plate 22 is also made of certain magnetic material, so that the upper surface of the detachable magnet 311 is completely attached to the upper horizontal plate 22. As a result, the attachment spike 3 is prevented from accidentally separating from the receiving groove 211

during walking.

As stated above, the attachment spike 33 is provided with a plurality of triangular prominent spike blades 331.

These prominent spike blades 331 are adapted to be stuck into the surface of snowy or icy roads, thereby effectively preventing the skidding of the shoe.

Industrial Applicability As apparent from the above description, the present invention provides a skid-proof shoe, which is configured to allow an attachment spike to be selectively attached or detached to or from an outsole thereof as occasion demands, thereby being adapted to prevent the skidding of the shoe during walking on slippery roads such as snowy or icy roads.

That is to say, the present invention is effective to achieve a skid-proof shoe with excellent safety effects.

Further, according to the present invention, the skid- proof shoe comprises a plurality of triangular prominent spike blades at the lower portion of the attachment spike, thereby causing the prominent spike blades to be stuck into the snowy or icy roads and mountain roads. This maximizes a skid- proofing effect of the shoe.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those

skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.