Shoe disinfectant and deodorizer

A device for deodorizing and disinfecting a shoe by means of irradiation of biocidal ultraviolet (UV) light into the shoe interior. The device includes a substantially tubular light pipe that at one end incorporates a UV lamp connected to a power source, while the opposite end of the light pipe is inserted into a shoe. The inserted end may be covered by a protective cover fabricated of a thin polymer film that is substantially transparent in the UV spectral range. The light pipe has a reflective inner surface.

PREFERRED EMBODIMENTS FIG. 1 shows a cross-sectional view of the optical disinfectant/deodorizer 1 . The source of biocidal light is lamp 2 that may be a UV lamp. The lamp preferably should emanate at least portion of light in the wavelength range from 2000 to 3000 angstroms. Since most of such lamps emanate light within 360 degree angle, that light needs to be directed toward the desired area. In this embodiment, the light shall be directed into the interior of a shoe and not to any other locations. Moreover, the light shall be diffused within the shoe interior over sufficiently wide area and not to be focused on any particular spot. This is accomplished by light pipe 3 having lamp 2 at one end and the exit aperture 5 at the other end. The lower part of the pipe is to be positioned inside a shoe so that aperture 5 is removed from the shoe inner lining at a distance from about 0.5 to about 2 inches, depending on the shoe size and disinfected area. Lamp 2 may be aided with reflector 7 that diverts radiation toward light pipe 3 . Interior 4 of light pipe 3 is made of highly reflective material, such as polished aluminum. Numerous other reflective surfaces are possible that include metallized plastics, films, etc. The device operates as follows. For the illustration purpose, consider ray 11 emitted by lamp 2 toward the interior 4 of light pipe 3 . The ray is reflected from the mirror surface of interior 4 in a zigzag manner and exits aperture 5 . Different rays 8 exit the light pipe at different angles. FIG. 2 shows light pipe 3 inserted into shoe 10 so that light rays 8 irradiate the shoe interior over a wide area. In FIG. 2 , the UV lamp is encased inside light chamber 9 . Naturally, devices like the one depicted in FIG. 2 may be stacked one next another for treatment of multiple shoes simultaneously. There is a possibility that infection from a shoe interior may be transmitted by way of physical contact to the outside surface of a light pipe and, subsequently, transmitted to another shoe or even to the same shoe during the following treatments. This may cause spread of infection or re-infection of the same user. To minimize a risk of such an undesirable event, light pipe 3 may be made disposable and discarded after each shoe treatment. This however, may appear too costly. Alternatively, a disposable protective cover 6 may be used to envelop that portion of light pipe 3 that may come in contact with a shoe. Cover 6 should be fabricated of a material that has a substantial transparency in the wavelength range of the lamp. An example of such a material is polyolefin and more specifically, polyethylene. Thickness of cover 6 should range from 0.0005 to 0.002″ (0.01-0.05 mm). A cover has a shape of a bag in is secured on a light pipe by one of conventional methods known in art. Since such covers can be produced very economically, they can be discarded after each use. It should be appreciated that a protective cover as described above may be used with any type of biocidal light source, including the combination of a lamp and a light pipe, and those devices known in prior art. It may be desirable to shape the exit angle of light rays to a desirable value, that is, to make the illuminated field either wider or narrower. This can be achieved by varying the substantially circular profile of a light pipe along the light pipe length, especially at its portion that is inserted into a shoe. FIGS. 3 and 4 illustrate that the exit angle can be made either very wide ( 13 ) or very narrow ( 18 ) by shaping the lower portion of the light pipe. Lower portions 14 and 16 of light pipes 3 have conical shapes, where the smaller diameter 15 leads to wider angle 13 , while the larger diameter 17 results in narrower angle 18 . For a more efficient light distribution, lower portions 14 and 16 may have a parabolic, rather than linear profile. As a practical matter, it is usually desirable to irradiate the vamp portion of a show. To deliver light better to that area, the light pipe may have a slightly curved shape of the lower portion 35 , as illustrated in FIG. 1 . FIGS. 5 and 6 illustrate a portable device produced according to this invention. It is depicted in FIG. 6 in a folded non-operational state. The device is comprised of two light pipes 23 and 24 , biocidal lamp 2 , switch 27 , pivot 22 , supporting pole 30 and base 26 . In turn, base 26 may contain electronic module 25 and electric cord 28 with plug 29 . In this folded state, switch 27 disables lamp 2 in order to prevent eye damage if the device is activated prematurely. To operate, the light pipes are rotated around pivot 22 in respective directions 31 and 32 , until lamp 2 is fully enclosed inside both light pipes, as shown in FIG. 6 . The entire structure is supported by pole 30 attached to base 26 . At the operational position position, switch 27 enables lamp that may be now activated by the electronic module. Each light pipe is inserted into shoe 10 . When powered, lamp 2 emanates light rays into both light pipes 23 and 24 , from which light rays 8 exit into the interior of a respective shoe 10 . Electronic module 25 may contain a power supply, power switch and a timer that turns light off after the treatment procedure is complete. Practically, the time of treatment ranges from 2 to 10 minutes, depending on the power of lamp 2 , geometry and reflectivity of light pipes 23 and 24 , protective covers, if any, and shoe sizes. In addition, electronic module 25 may contain components required for operation of lamp 2 , such as an electrical ballast. The ballast provides the voltage required by lamp 2 , usually a stepped-up voltage. While the above description contains many specifics, these specifics should not be construed as limitations on the scope of the invention, but merely as exemplifications of preferred embodiments thereof Those skilled in the art will envision many other possible variations that are within the scope and spirit of the invention as defined by the claims appended hereto.