Tray transport cart having electromagnetic induction heaters for heating meals to be placed on the trays
AssigneeBerndorf Luzern AG
InventorsHerman Meier, Martin Witzig
Life of this patent
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Abstract
A tray transport cart which accommodates trays for holding dishes for containing meals has a movable cart body with a plurality of tray carriers installed therein. Induction coils are inserted into the tray carriers for generating a local electromagnetic field. The trays hold the dishes which are provided with a current-conducting layer. An HF generator positioned on the cart body cooperates with the induction coils to produce the total inductance of the coils to generate a desired induction current in the current-conducting layer of the dishes, in the range between 32 .mu.H and 76 .mu.H, to maintain the meals contained in the dishes at warm temperatures.
Claims10
Tray transport cart accommodating a plurality of trays arranged in rows comprising:
- a movable cart body;
- an HF generator for connection to a power source;
- a plurality of tray carriers for supporting said trays and being mounted in rows on said cart body said tray carriers having induction coils connected to said generator for generating a local alternating electromagnetic field at said tray carriers;
- said trays being configured to support thereon dishes for containing meals, selectively above or next to said coils;
- said dishes being at least partially provided with a first current-conducting layer and with an insulating cover, to an inner side of which a second current-conducting layer is applied;
- said generator including circuit means for maintaining a total inductance of said coils of said plurality of tray carriers in a range between 32 .mu.H and 76 .mu.H regardless of the number of said plurality of tray carriers in actual use, a desired induction current being generated in said conducting layers that are in use.
Dependencies are inferred from the claim text.