The present invention generally relates to the field of sanitization. In particular, the present invention is directed to an ultraviolet germicidal irradiation cabinet and components and features therefor.
Germicidal irradiation using shortwave ultraviolet light (UVL-C) has long been used for killing germs. The food-service industry, for example, utilizes UVL-C germicidal irradiation sanitization cabinets that allow food-service providers to sanitize food preparation and handling equipment, such as kitchen and eating utensils. For example, various vendors sell UVL-C based sanitization cabinets for sanitizing knives.
In one implementation, the present disclosure is directed to a sanitization cabinet. The sanitization cabinet includes an enclosure forming a sanitization space designed and configured to receive at least one article to be sanitized, the enclosure having a plurality of interior surfaces each having a surface finish for reflecting ultraviolet light type C (UVL-C) within sanitization space; a UVL-C source located so as to provide UVL-C to the sanitization space; and an article support having at least one article support region designed and configured to supportingly contact the at least one article at a corresponding contact zone, wherein the article support region is made of a UVL-C-transparent material that allows UVL-C from the UVL-C source to illuminate the contact zone.
In another implementation, the present disclosure is directed to an article support for a sanitizing cabinet that uses ultraviolet light type C (UVL-C) from at least one UVL-C source to sanitize at least one article. The article support includes at least one support region designed and configured to supportingly contact the at least one article at a corresponding contact zone, wherein the support region is made of a UVL-C-transparent material that allows UVL-C from the UVL-C source to illuminate the contact zone; wherein the article support is designed and configured to be supportingly installed within the sanitizing cabinet.
In still another implementation, the present disclosure is directed to a method of manufacturing an article support for an ultraviolet light type C (UVL-C) based sanitization cabinet. The method includes determining an article to be supported by the article support when the article support is installed in the sanitization cabinet and the article is placed in the sanitization cabinet for sanitizing with the UVL-C during a sanitization operation; locating on the article support an article support region wherein the article will be supported by the article support and will have a contact region in contact with the article support region when the article support is supporting the article within the sanitization cabinet during the sanitization operation; and manufacturing the article support to provide a UVL-C transparent material at the article support region so that UVL-C can reach the contact region of the article when the article support region is supporting the article within the sanitization cabinet during the sanitization operation.
For the purpose of illustrating the invention, the drawings show aspects of one or more embodiments of the invention. However, it should be understood that the present invention is not limited to the precise arrangements and instrumentalities shown in the drawings, wherein:
The present inventor has found that in the context of sanitizing kitchen knives in commercial kitchens, when the knives are supported in a conventional type-C ultraviolet light (UVL-C) based sanitization cabinet, such as by a conventional strip-type magnetic holder in which a knife blade is in direct contact with the magnetic strips of the holder, the UVL-C does not reach the parts of the knife blade contacting the magnetic strips. The same problem exists with other types of conventional article holders, such as wire racks and hooks, where the knives directly contact the holders. In addition, much of the UVL-C does not reach portions of the knife blade that confront but do not necessarily touch the holder because of excessive shadowing. Therefore, each knife is not 100% sanitized. In addition, the present inventor has also found that conventional UVL-C sanitization cabinets, which have interior surfaces of poor light-reflectivity, have relatively low sanitizing efficiencies in terms of the amount of time per watt of the UVL-C source it takes to complete a sanitization cycle, that is, the amount of time per watt it takes to achieve a target level of sanitization for an exposed surface of the article being sanitized. With this measure, the lower the amount of time per watt, the higher the efficiency, and vice versa.
In connection with solving at least these shortcomings of conventional UVL-C sanitization, the present inventor has developed UVL-C sanitization cabinets and components thereof that permit efficient and effective UV germicidal irradiation of 100% of the outer surface of each article placed into such a cabinet and/or high-efficiency sanitation cycles, i.e., sanitation cycles that have sanitation efficiencies substantially higher than conventional UVL-C sanitization cabinets. It is noted that the term “cabinet” and like terms as used in the present description and any appended claims is intended to have a broad meaning that includes not only self-contained structures that can be, for example, mounted to walls, mounted on casters, or freestanding, but also to similar structures that are built into larger structures, such as under-counter or over-counter cabinetry and mobile or fixed multifunctional workstations, among other things. As will be understood by those skilled in the art, features and aspects of the present invention can be used singly or together in various combinations to achieve the desired functionality and/or desired performance. For the sake of illustrating the present invention, the various aspects and features thereof are presented in the context of specific embodiments shown in the accompanying drawings and described below. While specific embodiments are used for illustrative purposes, those skilled in the art will readily appreciate that the aspect and features that underlie these embodiments can readily be implemented, alone and in various combinations, in a wide range of UVL-C sanitization cabinets, all of which are encompassed by the present invention.
Referring now to the drawings,
While many other article supports can be used for article support 116, the knife-support version illustrated in
Also in the embodiment shown, knife holder 116 includes a pair of pivot stops 608A and 608B (only several labeled for convenience and to avoid clutter) at each slot 116A. Pivot stops 608A and 608B are located on the underside of knife holder 116 and depend therefrom along a vertical height selected such that if a particular knife, such as either of knives 600(1) and 600(2), begins to pivot laterally, one or the other of the stops will keep the pivoting from becoming so excessive that contact between two knives or between a knife and an interior wall of the sanitization cabinet occurs. As those skilled in the art will readily appreciate, the vertical height of each pivot stop 608A and 608B can be determined based upon a number of factors, such as the width of the corresponding slot 116B, the design thickness for the knife blade, and the thickness of the horizontal portions 116C of knife holder 116. Another feature of knife holder 116 is that slots 116B are relatively long. This length provides a number of useful features, including the ability to accommodate large cutting utensils, such as butcher knives and cleavers, and the ability to stagger the relative positions of the knives in adjacent slots 116B. This can be seen to some extent in
Referring again to
In the embodiment shown, sanitization cabinet 100 includes a housing 120 that may house or otherwise support one or more UVL-C sources 122 (
In this embodiment, enclosure 108 includes a body portion 108A and a closure 108B movable relative to the body portion to allow a user to access sanitization space 112 for inserting and removing articles to be sanitized. Regarding materials of construction, body portion 108A may be made of any suitable material that is opaque to at least UVL-C to inhibit UVL-C from exiting sanitization space 112. In many cases, it is also desirable for body portion 108A to be easy to clean. Consequently, it is anticipated that many embodiments of a sanitization cabinet made in accordance with the present invention will have their body portions made of stainless steel or another UVL-C opaque material having superior cleanability and sanitizability. Similarly, closure 108B may be made of a suitable UVL-C opaque material, such as stainless steel (or other metal), UVL-C blocking glass, or UVL-C blocking plastic, or any combination thereof. In the embodiment shown, closure 108B is primarily made of a sheet 108C of UVL-C blocking glass and a pair of end channels 108D that facilitate mounting the sheet of glass to body portion 108A and protecting the corresponding respective edges of the glass sheet. In this example, sheet 108C is transparent to visible light to the extent that a viewer can view the contents of sanitization cabinet 100 at least while the cabinet is in a sanitizing cycle.
As noted above, a deficiency the present inventor has noted in conventional sanitization cabinets, at least sanitization cabinets for the food-service industry, is that the interior surfaces of the enclosures have poor reflectivity, which manifests itself in lower sanitization efficiency, inefficient energy usage, and longer sanitization times. Those cabinets typically have enclosures and doors made of brushed stainless steel sheet metal. As those skilled in the art will readily understand, UVL-C reflectivity of brushed stainless steel is relative low. Sanitization cabinet 100 of the present invention, however, has interior surfaces, such as interior surfaces 124(1) to 124(4), that are relatively highly polished to provide a mirror-type finish that reflects substantially more UVL-C than conventional brushed stainless steel. In the context of constructing enclosure of stainless steel, examples of surface finishes for stainless steel that provide mirror finishes include bright annealed (BA), 2BA (i.e., BA plus rolled with polished rolls), No. 7, No. 8, and temper rolled (TR) finishes as defined by the Specialty Steel Industry of North America (SSINA) trade association, Washington, D.C. (www.ssina.com). These finishes are designated in the appended claims, respectively, as an “SSINA BA finish”, an “SSINA 2BA finish”, an “SSINA No. 7 finish”, an “SSINA No. 8 finish”, and an “SSINA TR finish”. It is noted that materials other than stainless steel can be used to provide, in comparable manner relative to the stainless steel finished noted above, mirror-type reflectivity in the appropriate wavelength(s), including actual mirrors made using reflective coatings on appropriate substrates. The term “mirror-type reflectivity” as used herein and in the appended claims means a reflectivity that allows a human observer to see a reflected image of an object, such as a card from a deck of playing cards, and to discern details of the object, such as graphic depicting a king of a face card, in the object's reflection from a surface having such mirror-type reflectivity. As those skilled in the art will appreciate, with higher UVL-C reflectivities of the interior surfaces of a sanitizing cabinet, such as interior surfaces 124(1) to 124(4) of sanitizing cabinet 100, far more UVL-C light can reach the article(s) within sanitizing space, here, sanitizing space 112, and more UVL-C light translates into shorter sanitizing cycles, and hence, power usage, for a given power of UVL-C source(s) 122.
Importantly, article support 116 comprises, at least at the critical location(s) where the article(s) contact the article support and/or where the article support would create a shadow on each article if the support were not transparent to UVL-C, one or more materials that are substantially or completely transparent to UVL-C. As also noted above, the present inventor has found that conventional sanitization cabinets are plagued by the use of UVL-C opaque materials for the article holders within the sanitization cabinets. These opaque materials cause shadowing of the UVL-C that results in incomplete sanitization because the shadowed regions are not irradiated with the germicidal UVL-C. This leaves less than 100% of the articles sanitized. In addition, for kitchen knives in particular, conventional sanitization cabinets often have strip-type magnetic holders that engage the blades of the knives. Of course, the blades are the parts of knives that most frequently touch the foods they are used to cut, and this results in a high likelihood that any germs remaining at the shadowed regions of the blades contaminate the food.
In contrast and in the present invention, within at least the shadowing and contacted regions of article support 116, the article support is made of one or more materials that are transparent to UVL-C to the extent that UVL-C reaches the contacting and shadowed regions of the corresponding respective article being supported by the article support in amounts suitable for sanitizing the shadowed and contacting regions of the supported article in substantially the same amount of time and to the substantially same level of sanitization as non-shadowed and non-contacted regions of that supported article. It is noted that in the immediately preceding explanation, the terms “shadowing” and “shadowed” relate to the shadowing and shadowed effects that would be present if article support 116 were not made of one or more effectively UVL-C transparent materials and/or the articles contacting one another or a wall of cabinet 100. This is so because, since article support 116 has UVL-C transparency, there effectively is no shadowing since the UVL-C passes through and/or otherwise reaches the contacting and shadowed regions of the supported article.
Depending on the configuration of article support 116 and the locations of the contacting and shadowed regions of each article being supported by the article support relative to the location(s) of UVL-C source(s) 122, in the shadowing and contacted regions of the article support the article support can be shaped and otherwise configured to act as a UVL-C guide that guides UVL-C to the contacting and/or shadowed regions of the supported article. Such shaping and configuring can include, but not be limited to, creating facets and other structures that allow the article support to collect UVL-C and guide the collected UVL-C internally within article support 116 to the contacting and/or shadowed regions of each supported article. Examples of materials having effective UVL-C transparency include but are not limited to polycarbonate (e.g., LEXAN® plastic) and polyethylene terephthalate glycol (PTEG), among others. In some embodiments, such as the embodiment shown, each article support, here article support 116, may be made entirely of one or more UVL-C transparent materials. As mentioned above, in other embodiments, only the affected regions, i.e., the shadowing and contacted regions, of each article support is made of one or more UVL-C transparent materials, with parts outside those regions being made of one or more materials that are not transparent to UVL-C.
Whereas
In the example shown in
As seen in
Exemplary embodiments have been disclosed above and illustrated in the accompanying drawings. It will be understood by those skilled in the art that various changes, omissions and additions may be made to that which is specifically disclosed herein without departing from the spirit and scope of the present invention.
This application claims the benefit of priority of U.S. Provisional Patent Application Ser. No. 61/936,071, filed on Feb. 5, 2014, and titled “ULTRAVIOLET GERMICIDAL IRRADIATION CABINET AND COMPONENTS AND FEATURES THEREFOR,” which is incorporated herein by reference in its entirety.
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Number | Date | Country | |
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Number | Date | Country | |
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