Patent Publication Number: US-8984846-B2

Title: Container closure tool

Description:
FIELD OF THE INVENTION 
     The present invention relates to food storage containers and lids for closing and sealing same, and more particularly, to hand tools and accessories for closing containers by placement of a lid designed for retention by a foldable edge of the container. 
     BACKGROUND OF THE INVENTION 
     Food storage containers come in many different varieties, and are a common item for kitchen and restaurant use. In the home, they are typically made of plastic, designed to be sealed by a fitted interlocking of the container and a removable lid. Examples of these type of containers are known by their tradenames and trademarks, such as Tupperware, Rubbermaid, Zip-Lock and others. These are generally designed so that the sealing of the lid and container maintain an airtight seal as much as possible, to insure freshness of the stored food contents over a period of time. 
     Restaurants also use food storage containers, such as aluminum foil containers or paper containers, plastic, etc. The containers may have various shapes, such as round or rectangular. These containers are typically used for food prepared by the restaurant and meant for home or hotel delivery, or as take-out orders by customers who enter the restaurant. Along with the term “restaurant” is included a wide range of various types of food establishments, including the popular types of hamburger eateries, fish restaurants and pizza stores, etc. 
     Aluminum foil containers are typically designed with a peripheral vertical flange which can be folded over to retain a foil-backed or paper lid, and although this type of closure may not be airtight, the closed container is useful for storage of food under controlled conditions such as in a refrigerator. Even without the use of a refrigerator to maintain food freshness as a function of temperature, the aluminum foil container is an effective way of storing food for short periods. For example, aluminum foil containers are used for delivery of food by a food establishment, such as take-out orders, where the prepared food is shipped in the foil container and meant for immediate consumption in the home once delivered. 
     In this use of foil containers for delivery of prepared food, the food establishment typically has a stock of these containers and lids in the kitchen area to be used by the food preparation staff. Once the food preparation staff places the prepared food in the foil container, the lid must be placed over the container before the container can be delivered. In cases where hot food is being prepared, it is important to close the food container as quickly as possible, in an attempt to retain the heat within the closed container. In many cases, the food preparer simply bends the vertical flange using his or her fingers, but this is unsafe since the sharpness of the foil edge presents the risk of injury by cuts to the fingers. The task of closing the foil container quickly has been simplified by the use of hand-held tools, developed specifically for this use. 
     Examples of prior art tools used for closing or sealing food containers are published in the following US patents and/or patent applications, and design patents: 
     U.S. Pat. No. 4,170,862 to Lazure discloses a device or tool for crimping the lid of a container onto the container; 
     U.S. Pat. No. 2,784,543 to Barr discloses a tool for sealing a container in which a ring is placed onto the top of the lid and then pressed around the circumference of the lid, sealing it; 
     US Pat. Appln. 2003/0205032 to Guiliano et al. discloses a tool for pressing closed a foil or aluminum lid onto a container; 
     U.S. Pat. No. 3,905,174 to Heisler discloses a crimping or pressing tool for manually pressing an aluminum lid onto a container; 
     U.S. Pat. No. 5,140,796 to Pope discloses a hand-held tool for closing a food storage bag in which the edge of the bag is pinched between the tool and then pulled along the edge of the bag, sealing it; and 
     U.S. Design Pat. No. 386,654 to Kosmyna illustrates a design for a tool to seal a plastic food storage container. 
     The hand-held tools described above are generally designed for hand manipulation when applied to the container to enable bending, folding or pushing a sealing portion of the container design into contact with another surface, such as the edge of a lid or other portion of the container, to close it. 
     The Guiliano et al tool is shaped as a rod having a wheel attached at one end, and the wheel is shaped to engage a peripheral flange of a round aluminum foil container body and bend and crimp it, so as to close it against the outer edge of the lid. The wheel provides a single point of contact with the container flange at any moment, and the wheel is manipulated to roll around the container perimeter. Because of its design, the single point of contact must be maintained between the wheel and the container flange, or else during the manipulation, the wheel slips off the container flange, and must be relocated to complete the task of rolling around the perimeter. This slows the procedure of closing the lid onto the container, and requires multiple relocations. 
     Therefore, it would be desirable to provide a hand tool for closing a container lid onto the container, in a quick, efficient and easy to perform hand manipulation. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is a principal object of the present invention to overcome the disadvantages associated with prior art hand tools for closing a container lid onto a container, and provide a simple and efficient tool for performing this task with minimal hand manipulation, to speed the closure procedure and minimize the risk of injury. 
     In accordance with a principal object of the present invention, there is provided a container closure tool comprising: 
     a hand-held housing; 
     at least one pair of wheels each rotatably mounted on a respective back and front end of said housing, each wheel being formed with a tapered contour, said contour being oriented so as to face outwardly of said housing on the bottom of said wheel, 
     such that when a lid is placed over the container with the outer edge of the lid aligned proximate a peripheral vertical flange of the container all along its circumference, and said tapered contour of each of said at least one pair of wheels is simultaneously placed so as to engage the peripheral flange of the container, said at least one pair of wheels providing at least two points of contact between said closure tool and the container peripheral flange, said both points of contact providing both bending and crimping action simultaneously, 
     so that application of closure toot pressure against said flange while moving the container in a circular direction causes simultaneous bending and crimping action on said flange inwardly at said two points of contact so as to retain the container lid all along its circumference in a single, continuous hand motion. 
     In a preferred embodiment, the housing is provided with two identical side portions, made of a rigid material such as molded plastic, each having an upper end and a lower end. The pair of side portions are spaced apart from one another and extend parallel to each other, defining a hollow space therebetween, for mounting a pair of wheels. The lower ends of the side portions are arch-shaped defining a pair of oppositely located corners. Formed on the upper end of the side portion is an elongated handle formed with ribs for easy grasping. 
     Each of the wheels is formed with a tapered contour, which faces outwardly from the bottom of the closure tool and is thereby exposed in order to engage a peripheral flange formed on the container, with the flange being thin enough to bend. 
     The housings two side portions together with the wheels mounted therebetween form the inventive closure tool, which can be manipulated to close a container. 
     When a lid is placed over the top of the container so that its outer edge is aligned proximate a peripheral vertical flange of the container all along its circumference, the closure tool can be used to close the foil container. This is achieved by applying pressure via the pair of closure tool wheels against the peripheral flange of the container, thereby bending it over the edge of the lid, as the container is moved in a circular fashion, while holding the closure tool in the other hand, thereby closing it. 
     Based on the design of the inventive closure tool, the pair of wheels provides two points of contact between the closure tool and the container peripheral flange. This design feature stabilizes the closure tool as the container is moved in a circular fashion. The stability of the closure tool against the peripheral flange of the container enables the closure tool movement to be accomplished in a single, continuous motion. 
     In accordance with a principal object of the present invention, there is provided a method for closing a food container comprising the steps of: 
     providing a container closure tool comprising:
         a hand-held housing;   at least one pair of wheels each rotatably mounted on a respective back and front end of said housing, each wheel being formed with a tapered contour, said contour being oriented so as to face outwardly of said housing on the bottom of said wheel,       

     placing a lid over the container with the outer edge of the lid aligned proximate a peripheral vertical flange of the container all along its circumference, 
     placing said tapered contour of each of said at least one pair of wheels simultaneously so as to engage the peripheral flange of the container, said at least one pair of wheels providing at least two points of contact between said closure tool and the container peripheral flange, said both points of contact providing both bending and crimping action simultaneously, and 
     applying closure tool pressure against said flange while moving the container in a circular direction causing simultaneous bending and crimping action on said flange inwardly at said two points of contact so as to retain the container lid all along its circumference in a single, continuous hand motion. 
     Other features and advantages of the invention will become apparent from the following drawings and description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a better understanding of the invention with regard to the embodiments thereof, reference is made to the accompanying drawings, in which like numerals designate corresponding sections or elements throughout, and in which: 
         FIG. 1  illustrates a prior art tool for closing a container by crimping the container&#39;s peripheral flange over the periphery of the lid; 
         FIG. 2  shows a perspective view of the inventive closure tool, constructed and operated in accordance with the principles of the present invention; 
         FIG. 3  shows a side view of the inventive closure tool of  FIG. 2 ; 
         FIG. 4  shows an end view of the inventive closure tool of  FIG. 2 ; 
         FIG. 5  shows a bottom view of the inventive closure tool of  FIG. 2 ; 
         FIG. 6  shows an exploded view of the inventive closure tool of  FIG. 2 ; 
         FIG. 7  shows a perspective view of a container to which there is applied a preferred embodiment of the closure tool of  FIG. 2 ; 
         FIG. 8  shows a top view of the container of  FIG. 7 , showing the closure tool applied to the peripheral flange of the container. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now to  FIG. 1 , there is shown a prior art tool for closing a foil container by crimping the container&#39;s peripheral flange over the periphery of the lid. As described in US Pat. Appln. Pub No. 2003/0205032, a foil container C comprises a flat bottom portion  10  and a circumferential vertical wall  12 , and is covered by a lid  14  supported by the upper portion  16  of wall  12 , at which there is formed a peripheral edge  18 . Tool  20  comprises an elongated rod  22  having a wheel  24  mounted at one end thereof. Wheel  24  is shaped with an annular groove  26  which divides the wheel into two half-sections, with one of the sections  28  shaped as a star and the other half-section  30  shaped as a disc. 
     In use, the prior art tool  20  is applied to the foil container so that the annular groove  26  engages peripheral edge  18 . When pressure is applied as the tool  20  is pushed with a circular motion around the perimeter of the foil container C, peripheral edge  18  is crimped over the outer edge of lid  14 , thereby closing the container with the lid. 
     Because of its design, prior art tool  20  provides only a single point of contact with the peripheral edge  18  as the circular motion of tool  20  is applied. As a result, it is difficult to maintain the circular motion of tool  20  in continuous fashion, since occasionally the tool  20  slips off the peripheral edge  18 . In this event, tool  20  must be relocated on peripheral edge  18  of container C, in order to complete the closing activity. 
     Referring now to  FIG. 2 , there is shown a perspective view of a closure tool  30  constructed and operated in accordance with the principles of the present invention. Closure tool  30  comprises a housing  32 , formed by a pair of side portions  34 ,  36  which are identical to each other, and are constructed of rigid materials, typically injection-molded plastic. The pair of side portions  34 ,  36  are spaced apart from one another and extend parallel to each other, defining a hollow space  44  therebetween, for mounting a pair of wheels  46 ,  48 . Lower ends  33  of side portions  34 ,  36  are arch-shaped defining a pair of oppositely located corners  43   a ,  43   b  and  43   c ,  43   d , respectively. Formed on upper end  31  of side portion  34  is an elongated handle  38  formed with ribs for easy grasping. 
     Each of wheels  46 ,  48  is formed with a tapered contour  50 , which faces outwardly from the bottom of closure tool  30  and is thereby exposed. 
     Referring now to  FIG. 3 , there is shown a side view of closure tool  30  showing wheels  46 ,  48  mounted in housing  32 . 
     Referring now to  FIG. 4 , there is shown an end view of closure tool  30 , as seen in accordance with directional arrows A-A of  FIG. 3 . In this view, only wheel  46  is visible, and as shown in  FIG. 5 , both wheels  46 ,  48  are mounted within housing  32 , as further described. An end view of handle  38  is also shown. 
     Referring now to  FIG. 5 , there is shown a bottom view of closure tool  30  showing both wheels  46 ,  48  mounted between side portion  34  and side portion  36 . 
       FIG. 6  shows a front perspective exploded view of the closure tool  30  of  FIG. 2 . Closure tool  30  comprises four main parts: side portion  34 , side portion  36  and wheels  46 ,  48 . On the inner face of side portion  36  there is formed pin  35   b , on which wheel  48  is mounted, and on the inner face of side portion  34  is pin  35   a  on which wheel  46  is mounted. Pins  35   b  and  35   a  are inserted into hole  37   b  (not shown) formed in the inner face of side portion  34 , and hole  37   a  formed on the inner face of side portion  36 , respectively, when the parts are to be assembled for use of the tool. Additional joining connectors  39   a ,  39   b  formed on inner faces of side portions  36 ,  34  are inserted into holes  41   a  (not shown),  41   b , respectively, formed on the inner faces of side portions  34 ,  36 , respectively. This construction provides additional structural stability when closure tool  30  is assembled. 
     Referring now to  FIG. 7 , there is shown a top perspective view of a foil container  25  to which there is applied a preferred embodiment of a closure tool  30  constructed and operated in accordance with the principles of the present invention. 
     Tapered contour  50  of wheels  46 ,  48  is shaped to engage a peripheral flange  52  formed on the foil container  25 , with the flange being thin enough to bend. Tapered contour  50  of wheels  46 ,  48  faces outwardly from the bottom  45  of closure tool  30  and is thereby exposed in order to engage flange  52 . 
     In use, when a lid  54  is placed over the top of the foil container  25  so that its outer edge  56  is aligned proximate the peripheral vertical flange  52  of the foil container all along its circumference, the closure tool  30  can be used to close the foil container. This is achieved by applying pressure via the pair of closure tool wheels  46 ,  48  against the peripheral flange  52  of the foil container, thereby bending it over the outer edge  56  of the lid  54 , as the foil container  25  is moved in a circular fashion, thereby closing it. The application angle of tool  30  to flange  52  is controlled by the user by rotating his/her wrist. 
     Based on the design of the inventive closure tool  30 , the pair of wheels  46 ,  48  provides two points of contact between the closure tool  30  and the foil container  25  peripheral flange  52 , both points of contact providing both bending and crimping action simultaneously. This design feature stabilizes the closure tool  30  as foil container  25  is moved in a circular fashion. The stability of the closure tool  30  against the peripheral flange  52  of the foil container  25  enables the foil container  25  closure to be accomplished in a single, continuous motion. 
     Referring now to  FIG. 8  there is shown a top view of the foil container of  FIG. 7 , showing the closure tool applied to the peripheral flange of the foil container. 
     The container may be manufactured from one of foil, paper, plastic and any other materials suited for packing food 
     Having described the invention with regard to particular embodiments thereof it is to be understood that the description is not meant as a limitation, since further modifications will now become apparent to those skilled in the art, and it is intended to cover such modifications as fall within the scope of the appended claims.