Many restaurants' success depends on how quickly customers can be served with food items that a customer orders. If the rate at which a restaurant cooks food products equals the rate at which those same food products are being ordered and sold, a fast food restaurant can theoretically have freshly-cooked foods ready to serve for customers as they arrive. Since it is not always possible to match cooked-food production with customer ordering rates, and since fast food restaurant customers expect to receive their ordered food items quickly, many fast food restaurants pre-cook various food items and keep them warm, ready for sale until a customer arrives and purchases a pre-cooked food item.
Pre-cooked food items cannot be stored for prolonged periods and must be kept warm while they are being held. Prolonged heating causes food texture and flavor to deteriorate. The time that a food product can be kept warm yet remain palatable will vary with each type of food product. It is therefore beneficial to have an ability to store different types of foods at different temperatures and keep track of the time that a food has been kept warm.
Food holding cabinets are well known in the prior art. A problem with prior art food holding cabinets, as with most commercial restaurant equipment is that they sometimes fail and require a service technician to repair. In keeping with food service operators' goal of reducing cost, it would be desirable to provide on-site service ability to a food holding cabinet whereby repairs can be effectuated by a restaurant operator, on-site and without having to call a service technician.
Preferred embodiments are set forth in the following detailed description and accompanying in drawings in which like reference numerals represent like parts.
As can be seen in
The front face 22 and the rear face 24, are provided with snap-into-place bezels, which are also referred to herein as snap-in escutcheons or simply escutcheons, and which are identified in the figures by reference numeral 26. As described more fully below, the escutcheons 26 cover the edges 25 of the shelves 21. They also define openings into food storage compartments 23. And, the escutcheons 26 provide user interface devices, which include display devices and user-actuated control devices, the function and operation of which is described more fully below.
Importantly, the escutcheons 26 are used on both the front and rear faces of the cabinet 10 and are interchangeable. The escutcheons 26 are configured to have electrically parallel electrical connectors 46 at each end of the escutcheon 26, which mate with chassis-located connectors 50 described more fully below but preferably located to one side of each cabinet face.
Below the electronics compartment 15 are several horizontal and substantially planar, thermally-conductive shelves 21. The shelves 21 are vertically separated from each other in the chassis 12 and fixed between the left side panel 18 and right side panel 20 to define food-holding compartments 23. The vertical separation distance between each shelf 21 defines the height of each compartment 23 and thus the maximum height of a food item or the packaging for a food item.
The shelves 21 and thus the compartments 23 are considered to extend horizontally across most of the width of the cabinet 10. The shelves 21 are preferably made from thermally conductive materials such as aluminum, copper or steel, so that the temperature of the food holding compartments 23 can be maintained by the transfer of heat from the shelf 21 into the compartment 23, or from the compartment 23 into the shelf 21. Different types of temperature control elements 50 are embedded into each shelf or otherwise thermally coupled thereto. Compartment temperature can thus be achieved by controlling the temperature of the temperature control elements 50, which in turn controls the temperature of the thermally conductive shelves 21, which define the compartments 23.
In a preferred embodiment, the shelves 21 of the cabinet 10 are subdivided horizontally into separate, temperature-controlled zones. The different zones for each shelf are identified in
A heater embedded in the shelf 21 and centered in the “A” zone is separately controlled from heaters that are embedded in the same shelf 21 and centered in zones B and C and vice versa. In an alternate embodiment, zones A, B and C and corresponding embedded heaters are thermally isolated from each other using a thermal break, such as those disclosed in co-pending application Ser. No. 12/267,449 entitled, BIFURCATED HEATED TOASTER PLATEN, which is assigned to the assignee of this application. The contents of co-pending application Ser. No. 12/267,449 are incorporated herein by reference, at least with regard to heated platens and the thermal breaks disclosed therein. In yet another embodiment, the zones are isolated from each other by walls 74, which extend between the top and bottom of the compartments 23, i.e., vertically-adjacent shelves 21 that define a compartment 23 between them.
As can be seen in
Since the escutcheon assemblies 26 abut thermally-conductive shelves 21 that can be hot to the touch, the escutcheons 26 are preferably formed from a high-temperature, heat and electricity-insulating, injection-molded plastic in order to protect operators from contacting hot and cold surfaces. The escutcheons 26 can also be formed of fiberglass, carbon fiber or other suitable thermally-insulating material.
As shown in
A rectangular-shaped opening in either the front or rear of the cabinet 10 is defined by the attachment of two escutcheons 26 to vertically adjacent shelves 21. In other words, when a first escutcheon 26 is attached to either a front or rear cabinet face to cover the edge 25 of a first shelf 21, the first escutcheon 21 and a second attached to the same cabinet face to cover the edge 25 of a second shelf 21 above or below the first shelf 21, together define a rectangular-shaped “opening” in the corresponding cabinet face. In the figures, the rectangular-shaped “openings” formed by adjacent escutcheons 26 on the front face 22 of the cabinet 10 are identified by reference numeral 28. The “openings” on the rear face 24 are identified by reference numeral 30. The openings thus provide rectangular-shaped openings into the temperature-controlled food-holding compartment 23 where the temperature of food items can be maintained under they are served or discarded.
In addition to covering the edges 25 of the shelves 21 and defining openings 28 and 30 into the compartments 23, the escutcheons 26 also provide one or more user interface devices, which convey information about conditions inside the compartment, a food item inside the compartment and/or allow the input of user commands to be given to computers for a compartment. Since the escutcheons 26 are field removable and replaceable yet provide electrically-operated user interfaces as described above, the escutcheons require electrical connections that are readily “made” when an escutcheon 26 is attached to the chassis yet “opened” when an escutcheon is removed. Stated another way, electrical connectors are provided to the escutcheon 26, which engage and disengage corresponding, mating connectors in the chassis 12.
Escutcheon-located user interfaces are embodied as incandescent indicator bulbs or light-emitting diodes (LEDs) 32, various types of switches 33, liquid crystal display (LCD) panels 36, “electronic-paper” or “e-panels, various types of key pads 34 as well biometric sensors. Such devices are well-known to those of ordinary skill in the electronic arts.
Incandescent bulbs and individual LEDS can provide on/off status indicators. Seven-segment LEDs can also be configured to display alphanumeric information. LED display panels can display text and/or graphics. Electronic paper can also be used to provide text and/or graphics.
Switches used in the escutcheons 26 include toggle, push-buttons and/or rocker switches, whether illuminated or not. Keypads are also used and can be either mechanically actuated switches, capacitance-sensitive or thermally-actuated. Biometric sensors used in the escutcheons 26 include finger print readers, such as those commonly used in many personal computers.
Electronic paper, which is also known as e-paper or electronic ink, is a well known display technology that mimics the appearance of ordinary ink on paper. Unlike a conventional flat panel LCD display, which uses either a backlight or incident room light, electronic paper or e-paper reflects light like ordinary paper. It is also capable of holding text and images indefinitely without drawing electricity, while allowing the image to be changed later. The user interfaces in the escutcheons 26 an operator to configure a compartment, e.g., set a desired temperature, a food holding time etc., as well as visually determine its status.
In the preferred cabinet embodiment, wherein shelves 21 have separate temperature zones, the escutcheons 26 are configured to provide a user interface for zone A, B and C of a corresponding shelf. In
Each escutcheon 26 has a left end 38 and a right end 40. As can be seen in
In a preferred embodiment of the cabinet 10, an escutcheon 26 can be used on either the front face 22 of the cabinet 10 or the rear face 24 of the cabinet 10. In other words, an escutcheon 26 can be removed from the rear face 24 and installed at the front face 22. In the same preferred embodiment of the cabinet 10, the electronic devices of the cabinet 10, which interface with user interfaces in the escutcheons 26, are located on only one side of the cabinet, i.e., the right side 20 of the cabinet, when the cabinet 10 is viewed from the front face 22. In order to make the same escutcheon 26 usable on both front and rear faces of the preferred embodiment of the cabinet 10, which has connectors for the escutcheon on only one side of the cabinet, both the left and rear ends of the escutcheon assembly 26 are provided the multi-conductor electrical connector(s) 46.
When an escutcheon 26 is installed on the rear face 24 of the cabinet 10 as described below, an electrical connector 46 on the left end 38 of the escutcheon 26 mates electrically and mechanically with a connector 50 located on the left side of the rear face 24 of the cabinet, which corresponds to the right side 20 of the cabinet 10 when the cabinet is viewed from the front. When the same escutcheon 26 is installed on the front face 22 of the cabinet 10, a connector 46 on the right end 40 of the escutcheon 26 mates electrically and mechanically with a connector 50 at the right side 20 of the front face 22 of the cabinet. Stated another way, both ends of the escutcheon are provided with the same connector 46.
In an alternate and equivalent embodiment, the cabinet 10 is configured to have a connector 50 at diagonally opposite corners. In such an embodiment, the escutcheon has a connector 46 at one of the left and right ends that mates with a corresponding connector 50 attached to the chassis at diagonally opposite corners.
As can be seen in
Whether the cabinet 10 is configured with the connectors 50 on the same, one side or at diagonally opposite corners, the user interfaces 32A and 32B on an escutcheon 26 are associated with the same zone of the same shelf 21, regardless of whether the escutcheon 26 is attached to the front face 22 or rear face 24 of the cabinet 10. In other words, when an escutcheon 26 is attached to the rear face 24, the user interface on the right-hand side of the escutcheon 26 pertains to the right-hand side of the corresponding shelf; the user interface on the left-hand side of the same escutcheon pertains to the left-hand side of the corresponding shelf. When the same escutcheon 26 is attached to the front face 22, the user interface on the right-hand side of the escutcheon 26 pertains to the right-hand side of the corresponding shelf the user interface on the left-hand side of the same escutcheon pertains to the left-hand side of the corresponding shelf.
As can be seen in
In
In
A second tab 52B is also formed into the ends of the escutcheon. The second tab 52B is much longer (or wider) than the snap-in detents 52A. Imbuing the larger tab 52B and detent 54B with a clearance fit enables them to align the connectors 46 and 50 and align the snap-in tab 52A with the corresponding detent 54A.
As can be seen in the figures, the escutcheons 26 extend substantially all the way across both the front face and the rear face of the chassis 12. At both sides of the chassis, the tabs, detents and electrical connectors are concealed from view and protected from being disengaged by elongated U-shaped end caps 56 that extend vertically along both sides 18 and 20 of the cabinet 10. The end caps 56 are fastened to the chassis 12 at the left and right sides preferably using screws to hold them in place. Alternate embodiments fasten the caps 56 into place using magnets or Velcro™ fasteners.
As mentioned above, the electrical connection provided by the connectors 46 and 50 carry electrical signals between user interface devices in the escutcheons and one or more cabinet-located controllers. The escutcheon-located user interface devices described above are therefore considered to form part of the escutcheons 26. In one embodiment, the user interface display devices display information that can include either a desired temperature of a compartment 23 or an actual temperature of the compartment, the time that a food item has been inside a compartment and/or the time that a food item should remain in a compartment, the identity of a food item in the compartment, or the identification of a person for whom a food product inside the compartment was made and is being stored.
The most common use for the food holding cabinet shown in the figures is as a heated cabinet wherein each of the compartments 23 maintains a separate temperature, elevated relative to room temperature, by way of electric heating elements formed in, attached above or mounted below the compartment shelves 21.
Heat can be provided to the compartments 23 using electrically resistive heating elements 50 thermally coupled to a shelf 21.
The foregoing description is for purposes of illustration only. Those of ordinary skill in the art will recognize that while the tabs 52 depicted in the figures are on the escutcheon 26 and the detents 54 are shown formed in the chassis sides, an alternate and equivalent embodiment reverses the location of the tabs and detents such that the tabs are formed into the chassis sides and detents are formed into the escutcheons. The true scope of the invention is set forth by the appurtenant claims.