DE8004971U1 - Rear window with adjustable heating field - Google Patents

Description

VI ...

"Rear window with adjustable heating field"

Electric heating disks, especially electrically heated Keck disks in motor vehicles, are good known. Their heating device, which serves to defrost or defrost these panes, generally consists of two Eanun ladders attached to the rear window rims opposite one another or collectors that are connected to one another by heating wires that span the entire surface of the pane. Of the Electricity generated by the vehicle's power source and flowing through the heating wires via the bus bars causes the rear window to warm up and thereby defrost or defrost it.

There are also already known rear windows which, instead of a single one, cover the entire window surface Heating device have a plurality of partial heaters which only heat one surface strip. Such partial heaters are similar to the ones described at the beginning, only the number of their heating wires and thus their current resistance is lower, so that when the current flows through them, they soon reach a higher temperature than the one described at the beginning The heating device with its many wires, and therefore the strip of surface that they serve Rear window is cleared much faster.

In those with a plurality of partial heaters

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provided rear windows, the former can usually be connected to the power source individually or in series, so that, after defrosting the first area strip, by connecting the remaining partial heaters the rest of the rear window area can also be cleared, depending on requirements and available power.

Rear windows with such partial heaters therefore prove to be particularly advantageous in the case of heavy icing the rear windows, and / or if the power generation is still incomplete, if the available heating power is used Concentrate on a few heating wires to quickly achieve a view over a strip of the rear window wants, to when the engine is running at full speed and the battery is fully charged, i.e. when it is increased Electricity generation, to be able to switch on other partial heaters in order to expand the view through them.

The subject of the present innovation is a rear window with partial heaters in which each surface strip can be defrosted or defrosted individually or together with others.

The heating device of the rear window according to the renovation consists of two pairs of bus bars attached to two opposite edges of the rear window are. Each pair consists of an upper and a lower bus bar, which can be used separately or together with the S 80 GM 134 - 5 -

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other connectable to one pole of the vehicle battery

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The heating wires are separated into a number of groups (three groups in this case). The first group connects the upper sanitary ladder of the one, e.g. the right pair with the upper bus bar of the opposite, left pair. The second heating wire group connects the said upper busbar of the right pair with the lower busbar of the left Couple. The third heating wire group connects the lower busbar of the left pair with the lower busbar of the right pair. A rear window with such an arrangement of its partial heater makes it possible to defrost either the upper, middle or lower surface strip or the entire rear window area or to defrost, through the various switching combinations that it enables.

Two exemplary embodiments of the innovation are described below in connection with the accompanying drawings are described in more detail.

Show it:

1 shows a first embodiment;

Fig. 2 shows a second embodiment;

3 shows a simplified version of the Keck washer.

The rear windows 1 of the first two figures

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only differ in the shape of their sanitary ladder, so the description below encompasses both.

With reference to these two figures, the left pair of busbars consists of an upper, shorter busbar or collector 2 ¹ and a lower, longer collector 2.Collector 2 ¹ is via a line 4 to the positive pole of the vehicle battery and collector 2 via a line 4 'optionally with

one of the poles of the battery can be connected. The upper, longer collector 3 of the right pair of busbars is connected to ground via line 5, and the lower right collector 3 "via conductor 5" is analogous. grounded.

From the right collector 3 a first heating wire group R-) leads to the left collector 2 'and a second I-Ieizdrahtgruppe R2 to the left, lower collector 2. The lower right collector 3 ^: is with the lower left

Collector 2 connected by a third heating wire group R3. Each heating wire group consists of a few (in this example two) wires with only a low current resistance.

It is obvious that a rear window with such an arrangement of its partial heaters has a lot to do with defrosting and defrosting Offers defrosting combinations. When connecting the

Line 4 with the positive pole and the earthing of the Lei-S 80. GM 134

February 25, 80

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Device 5 only heats the heating wire group Rj and thus only the upper third of the rear window area. If the line 4 ^{1 is} connected to the positive pole and the line 5 / is grounded, the current will only flow through the middle group of heating wires R2 and thus defrost the middle rear window area. The connection of the line 4 ¹ to the positive pole and the grounding of the line 5 ′ leads to the heating of the heating wire group 3 and thus to the view through the lowest surface strip of the rear window 1.

A connection of the lines 4 and 4 'to the positive pole and the grounding of the line 5 leads to the parallel connection of the heating wire groups R- | and R2 and thus for defrosting the upper and middle rear window strips. If the line 4 'is connected to the positive pole and if the lines 5 and 5' are grounded, the middle and lower surface strips of the rear window are either defrosted or defrosted. If you want to connect all three heating wire groups in series to clear the entire rear window area, you only need to connect line 4 to the positive pole and to ground ^{line 5 1.} The heating wire groups R-] and R2 can also be connected in series by ^{grounding the line 4 1} while the line 4 remains connected to the positive pole and the line 5 is interrupted.

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Consequently, the rear window according to the innovation offers combination options that make it practical can be adapted to all weather and power generation conditions.

The rear window shown in FIG. 3 differs from the one just described in that the left pair of busbars is fused to form a single busbar 6 and its conductor ends in a contact A. It is connected by heating wire group R ″ to the longer busbar T of the right-hand busbar pair, the conductor of which ends in a contact B. One or the other contact A, B can optionally be earthed by means of the switching lever 8.

The busbar 6 is connected to the shorter right Samirielleiter, which is constantly connected to the positive pole of the battery, by a further heating wire group R ^1. If the lever 8 is switched to position A, the current flows through the middle heating wire group R ¹ . If it is switched to position B, the heating wire groups R ″ are connected ^{in series with the heating wire group R 1.} A part of the heating wire group R ″ expediently extends above and the other part of the same below group R ¹ .

This design therefore offers the possibility of the rear window center either through the central group R '

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or, by connecting the groups R ¹ and R ″ in series, virtually the entire heating panel can be cleared.

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February 25, 80

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Claims (5)

• t · File number: G 80 04 971.4 S 80 GM 134 Applicant: Societä Italiana Vetro SIV ... September 25, 1980 Claims for protection 1. Heated rear window for motor vehicles with separately switchable heating circuits, characterized in that the disc (1) has a longer one on each side edge and a shorter busbar (2, 3; 2 ', 3'), the longer busbar (2,3) in the area of the upper, the shorter busbar on one side edge (2 ', 3') in the area of the lower edge of the pane ends, but on the other side longer and shorter busbars are reversed, with parallel Heating wires (R) running to the upper and lower edge of the pane in the upper and lower pane area are connected to a shorter and a longer bus bar, while they are in the middle pane area connected at both ends to the longer bus bars. 2. Rear window according to claim 1, characterized in that at each side edge of the rear window (1) of the the shorter and longer busbars (2.2 '; 3.3') together are approximately as long as the height of the disk. 3. Rear window according to claim 1, characterized in that both busbars (2.2 '; 3.3') in the area of each Side edge of the disc together an approximately semicircular Form a disc that is divided into two sections of unequal size, with the bottom sections of the semicircles on both side edges of the disc are facing each other and the dividing line at least runs roughly parallel to the upper and lower edge of the disc. 4. Rear window according to one of claims 1 to 3, characterized in that on one side edge of the window the shorter busbar (2 ¹ ) has a terminal for connection to the positive pole of a battery (4), the longer busbar (2) has a changeover switch (4 ¹ ) , while on the other side edge of the pane both bus bars (3.3 ') each have a connection (5.5') for connection to a ground. 5. Rear window according to one of claims 1 to 4, characterized characterized in that longer and shorter busbars form a unit (6) on one side edge of the pane, on the one hand via heating wires (R) with both the shorter and the longer bus bar (7.7 ') is connected in the area of the other side edge of the pane, on the other hand a connection for connection to ground having. S 80 GM 134
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