Welted waterproof foot covering

1. Field of the Invention

The invention relates to a foot covering, more particularly to a welted waterproof foot covering.

2. Description of the Related Art

Referring to FIG. 1, a conventional waterproof foot covering 10, as disclosed in U.S. Pat. No. 6,065,227, includes a rubber outsole 11, a lower enclosing shell 12 made of plastic, and an upper enclosure 13 made of leather or fabric material. A bottom portion of the lower enclosing shell 12 is fixed to the outsole 11. A bottom end of the upper enclosure 13 is connected to a top periphery of the lower enclosing shell 12 so as to define a foot-receiving chamber 14. The outsole 11 and the lower enclosing shell 12 are made of waterproof materials. The outsole 11 has an extension part 111 projecting upwardly from a top periphery thereof so as to extend beyond a junction 15 between the lower enclosing shell 12 and the outsole 11. As such, water may be further prevented from entering the foot-receiving chamber 14 through the junction 15. However, it is difficult to make complicated decorative modifications to an outer appearance of the conventional foot covering 10, so that the conventional foot covering 10 looks monotonous and unattractive.

Referring to FIG. 2, another conventional waterproof foot covering 20 is shown to include an outsole 21, a vamp 22, and a connecting pad 23 having an L-shaped cross section, which are all made of waterproof materials. The outsole 21 has an extension part 211 projecting upwardly from a top periphery thereof and adhered directly to a bottom periphery of the vamp 22. The L-shaped connecting pad 23 is disposed inside the vamp 22 so as to prevent water from entering the foot covering 20 through a crevice 24 between the extension part 211 of the outsole 21 and the bottom periphery of the vamp 22. The L-shaped connecting pad 23 has a bottom side adhered to the outsole 21, and a lateral side adhered to an inner wall of the bottom periphery of the vamp 22. However, since the adhesive bonding area between the outsole 21 and the vamp 22 is reduced, the connection therebetween is not strong and durable.

Still another conventional waterproof foot covering, as disclosed in U.S. Pat. No. 6,338,205, includes a plastic web platform molded integrally with a bottom portion of a plastic waterproof shell. The web platform is stitched to an outsole, thereby firmly securing the shell and the web platform to the outsole. Since the web platform is formed integrally with the shell, the material of the web platform is limited to be the same as that of the shell such that the color of the conventional foot covering is monotonous, and the aesthetic quality thereof poor.

Therefore, the object of the present invention is to provide a waterproof foot covering that is capable of overcoming the aforementioned drawbacks of the prior art.

Accordingly, a foot covering of this invention comprises a sole unit, a shell unit, and a welt. The shell unit has a substantially horizontal bottom wall, a peripheral wall extending upwardly from the bottom wall, and a protrusion extending downwardly from the bottom wall and elongated along the peripheral wall. The welt is attached to the sole unit and the shell unit, and has an inner part connected to the protrusion, and an outer part sewn to the sole unit.