DE2353173A1 - Heated serving trolley - has heat conductor screen-printed on side(s) of dielectric panel with thyristor power regulation - Google Patents

Abstract

Heated food-serving trolley has a panel of dielectric material with an endless linear heating conductor on at least one side, e.g. applied by screen printing, and uniformly distributed over the surface of the panel, with spaced-apart windings and with current connectors. At least a second plate is spaced from the first, as a contact protection plate. Preferably the panel unit is height-adjustable in the chassis, and/or pivotable about a horizontal axis. The heating power has a thyristor regulator. Since the heating plates have no ridges, grooves or other structural form to spoil the flat surfaces they are easily kept clean.

Description

Construction Consulting Cooperation Ltd., Basel (Switzerland) Grellinger Str. 35

¹¹ heating trolleys "■.

The invention relates to a warming trolley with a mobile support frame similar to a serving trolley.

Heated car windows are well known today ... The discs manufactured according to the known method but are not suitable for one. Connection to the usual AC mains of 22o volts. Rather, the connection would at such a high voltage destroy the relatively short resistor exters. To reduce the intensity, it is therefore necessary to increase the resistance of the heating conductor by either increasing the length or

the diameter is reduced. According to the previously known methods, however, such an arrangement is very difficult possible.

In the French patent 7 132 783 a method for producing a heating plate is described in which these problems are avoided.

The present invention relates, and in particular, to the use of a plate manufactured according to the known method on a warming trolley and it is based on the task., plates according to the French patent 7 132 783 to be used for a larger purpose.

This technical problem on which the invention is based is achieved by a plate carried by the support frame dielectric material, which is applied at least on one side, for example by screen printing, infinite linear heating conductor, which is evenly distributed over the surface of the plate, at a distance from each other widenings .has and is provided with power connection means, this Plate is assigned at least one second plate serving as contact protection at a distance.

According to the invention, the procedure is preferably such that

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the plate unit consisting of the two plates is arranged in the support frame so as to be adjustable in height and preferably pivotable about a horizontal axis.

A built-in thyristor control , which is known per se, makes it possible to adjust the heating power of the plate in accordance with the respective desired purposes. .

The proposal according to the invention achieves a warming trolley which has the advantage over the previously known devices that a serving table can also be designed as a warming plate, the heating power being kept correspondingly low. This plate can, however , be used at the same time as a so-called transition heater, especially after rotating around the horizontal axis, since the heating power can be regulated relatively high, with the upright plate acting as a radiator. Here it is also possible to provide the border that summarizes the two plates, for example made of stainless steel, with openings for air, so that a kind of convector heating is created without the risk of the contact protection being canceled.

The panel is easy to use and easy to adapt to various applications and also has the advantage that it has a perfectly smooth surface, so that comparison

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there is no risk of the plate becoming dirty. Through this any maintenance and care of the device is largely superfluous.

An example of the invention is illustrated below with reference to the drawing, 'explained. In the drawing shows

Fig. 1 is a perspective view of the invention

Warming trolley and
2 shows the arrangement of the plates in a much larger partial section.

In Fig. 1, 1 is an arbitrarily shaped support frame _s, preferably provided with rollers 2 _s shown ^ which carries the actual plate unit k on vertically directed support elements 3. The plate unit is formed by two plates 5 and 6, the plate 5 being designed to carry the heating conductor and the plate 6 being designed as a contact protection plate. The heating conductor applied to the plate 5 by a method known per se is denoted by 7. The two plates, which are at a small distance from one another, are combined in a corresponding support frame 8, for example made of stainless steel, whereby the spacing can be ensured by a device 9 known per se.

At. the heating conductor 7 is connected to a power connection means Io,

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which can also be equipped with a control device 11, can, through which the heat output emitted by the heating conductor can be regulated.

The plate unit 4 is arranged in a height-adjustable manner in the support frame 3, for example by means of the bracket-shaped bracket 12 according to FIG. 13 is indicated. Here, the rotating device 13 is designed so that a secure clamping of the plate unit U is guaranteed in the position shown in Figure Keeping the food placed on this trolley warm is used. If the plate unit 4 is now pivoted into a vertical plane, ie pivoted by 90 ° relative to the illustration in FIG. 1, this device can be used as a transition heater by using the plate unit U as a heat radiator. If 8 passage openings are provided in the frame, the two panels arranged next to one another in the manner of a chimney act at the same time as a convector, which can be desirable in certain applications. . .

The distance between the two plates can be in the case of the one shown Exemplary embodiments, for example, amount to 3omm for a

. .-. '■ -SOiBIiZOI 7 6 - .-; "■'. '', - 6 -

Plate thickness of 8 mm, the plates made of a dielectric Material, such as glass. Of course, others belonging to the prior art can also be used Materials are used as plate material.

Since the actual heating plates do not have any ribs or other structured structures that are required for artistic reasons Have surface, there is no risk of contamination and the heating device achieved in this way is maintenance-free and easy-care.

Depending on the width and the spacing of the heating conductors applied in the screen printing process, it is possible to use the

Design heating panels up to 10000 or 1500 W / m, so that then surface temperatures of .loo - 15o can be reached. The voltage is the usual voltage of 22o volts or Ho volts, so that the device immediately switches to normal Plug contact of the electrical house system can be plugged in.

Patent claims:

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Claims (1)

Patent claims: Iy Wärmewag en-with a servierwagenähnlicheKi "mobile support frame ₃ characterized by means carried by the support frame (1) plate (5) of dielectric material _{s s} carrying at least on one side a, for example, the screen printing process be interrupted least infinite linear heating element (7) connected via the, surface of the plate C5) is evenly distributed _{9 has} widenings at a distance from one another and is provided with power connection means (lo) ", with this plate (5) at least one second plate (6) serving as contact protection is assigned at a distance" ο Warming trolley according to claim 1 _s characterized ₉ that the plate unit (4) is arranged in the support frame Cl) so as to be adjustable in height. 3. Warming trolley according to claim 1 and 2, characterized »that the plate unit (4) in the support frame - (O" is arranged pivotably about a horizontal axis. U "Warming trolley according to claims 1-3, characterized by a thyristor control (11) for the heating output. 509818/0176 Blank page