A lockable food delivery box apparatus for preventing food tampering and contamination includes an insulated box defining a storage cavity configured to store food items for delivery. A box lid is selectively engageable with an open side of the insulated box. An electronic lock is coupled to the insulated box and is in operational communication with the box lid to secure and alternatively free the box lid. The electronic lock has a transceiver configured to be in operational communication with a smartphone. A heating coil is coupled to the insulated box to raise the temperature within the storage cavity. A cooling system is coupled to the insulated box to lower the temperature within the storage cavity. A power supply is coupled within the insulated box and is in operational communication with the heating coil, the cooling system, and the electronic lock.

The present invention provides single units that contain a large lower chamber, and one or more display shelves above this chamber on the inside of the unit. A roller grill or other large appliance may be provided in the lower chamber, or the chamber may be left open to display large food products or other items. The shelves may be heated for keeping foods displayed on the shelves warm; however, the shelves need not be heated for food products that do not need to be kept warm. Heating elements, lights and sensors may be adjusted using electronic controls to provide optimum temperatures inside the various chambers of the display units. Display units of the present invention allow store owners to utilize the space above a roller grill or other appliance to merchandise additional food products as opposed to requiring a separate food merchandiser to occupy additional valuable counter space. The performance of the roller grills of the present invention is improved over stand-alone roller grills, thereby reducing the potential for lost sales due to food not being sufficiently heated.

An electric heater includes a. substrate and an inner plane heating element formed on one surface of the substrate. The inner plane heating element includes an inner pattern portion connecting a start point with an end point. The inner pattern portion includes a first track, a second track located outside the first track and spaced part from the first track, a first bridge connecting the first track with one end of the second track, a third track located outside the second track and spaced apart from the second track, and a second bridge connecting the other end of the second track with the third track. A first gap G1 between the first and second tracks is shorter than a second gap G2 between the second and third tracks along a virtual line crossing the first, second and third tracks and closer to the first bridge than the second bridge.

An electric heater includes a substrate and an inner plane heating element formed on one surface of the substrate. The inner plane heating element includes an inner pattern portion connecting a start point with an end point. The inner pattern portion includes a first track, a second track located outside the first track and spaced part from the first track, a first bridge connecting the first track with one end of the second track, a third track located outside the second track and spaced apart from the second track, and a second bridge connecting the other end of the second track with the third track. A first gap G1 between the first and second tracks is shorter than a second gap G2 between the second and third tracks along a virtual line crossing the first, second and third tracks and closer to the first bridge than the second bridge.

A method of displaying a battery life for a warming cart battery is provided. The method includes the steps of detecting with a processor that a warming cart battery voltage is out of range of a predetermined threshold, determining with a processor an operation state of each of a plurality of periphery warming cart devices, and automatically setting a battery scale of a warming cart battery based on which of the plurality of periphery warming cart devices are in an active operation state.

The heater bag for bakery products comprises a flexible or semi-rigid casing defining a bottom (111), side walls (110), an opening (112), and means (113) for selectively closing the opening (112). At least one semi-flexible heater plate (121, 122) having an electrical heater element (141, 142) incorporated therein is itself inserted in a pocket of natural material comprising cotton, flax, and wool, said pocket constituting a portion of the flexible or semi-rigid casing of the bag. For each heater plate (121, 122), the heating power per cm.sup.2 lies in the range 0.13 W to 0.24 W.

The present invention relates to a dish warming system that includes a plurality of dish warming assemblies each having a plate with a power source and a heat element. The power source of each dish warming assembly allows for the concurrent charging of the plurality of dish warming assemblies while stacked. The heat element in some iterations of the system includes a pressure switch that activates the heat element when a dish is placed on the dish warming assembly.

In order to heat a bag filled, for example, with a food product to a predeterminable temperature, the entire cassette (1) has been heated in the past. The invention relates to a cassette (1) made of plastic, wherein in each of the cassette shells (2, 3) a receiving recess (10) is formed, in each of which a respective heat-conducting plate (11) is arranged securely in position. A heating element (20) is applied to the heat-conducting plate (11) and the heat-conducting plate (11) is retained in an insulated manner on the respective cassette shell (2, 3) such that a thermal insulating air gap remains between the heat-conducting plate (11) or the heating element (20) and the cassette shell (2, 3).

Disclosed is an automatic tea brewing and making device, comprising: a tea brewing and making container, an electronically controlled valve disposed at the bottom or the lower side of the tea brewing and making container, a first electric heating element, a water inlet pipe, a water injection control device provided on the water inlet pipe, and an electric control component. The electronically controlled valve is an electric valve or a solenoid valve. The tea brewing and making container is provided with an opening for filling water and putting tea leaves. The electric control component comprises a temperature detection device; and also comprises a controller. The temperature detection device, the water injection control device, the first electric heating element and the electronically controlled valve are all electrically connected with the controller.

The present invention provides single units that contain a large lower chamber, and one or more display shelves above this chamber on the inside of the unit. A roller grill or other large appliance may be provided in the lower chamber, or the chamber may be left open to display large food products or other items. The shelves may be heated for keeping foods displayed on the shelves warm; however, the shelves need not be heated for food products that do not need to be kept warm. Heating elements, lights and sensors may be adjusted using electronic controls to provide optimum temperatures inside the various chambers of the display units. Display units of the present invention allow store owners to utilize the space above a roller grill or other appliance to merchandise additional food products as opposed to requiring a separate food merchandiser to occupy additional valuable counter space. The performance of the roller grills of the present invention is improved over stand-alone roller grills, thereby reducing the potential for lost sales due to food not being sufficiently heated.