DE1061901B - Electric two-filament light bulb for motor vehicle headlights - Google Patents

Description

BiBLlOTKEK

OF THE GERMAN

PATEHTAHTES

The invention relates to a two-filament electric incandescent lamp for motor vehicle headlights with a helically wound, arcuate shape expanded main incandescent body, the one provided in the lamp, the auxiliary incandescent body partially surrounding screen is turned towards and its closer to the screen, in the headlight close to the Focal point of the reflector located part is supported in its center.

These lamps are designed to work together with a reflector. These reflectors are mostly separated from the actual light bulb. However, there are also known embodiments in which the rear part of the lamp bulb is designed in such a way, mostly paraboloid-like, that it Part of the lamp bulb itself can serve as a reflector after mirroring. To achieve an optimal With lamps of this type, the aim is to distribute light in the middle, closed part of the arc of the main incandescent body and the end of the closest to this main incandescent body with the Umbrella cooperating auxiliary incandescent body to attach as close as possible to the focal point of the reflector. The closed part of the arc of the main incandescent body comes in a very small distance from the adjacent rear end of said umbrella. To stiffen the inner lamp structure and in particular to prevent deflection of the main incandescent body, whereby the light distribution of the beam to be emitted could be impaired, it is desirable the main incandescent body, the ends of which are attached to two pole wires, at this point of its arc supported by an additional bracket. This is particularly desirable when using such a mantle is relatively large and therefore relatively heavy.

Such an incandescent lamp in which the part of the main incandescent body that is close to the screen is in its Center is supported is already known. The main glow body and the supported part are in one level. There is therefore a risk that the support wire will come into contact with the screen comes. In addition, the main incandescent body can move transversely to the lamp axis. Such a +5 However, shifting would have an unfavorable effect on the light distribution.

The invention eliminates these disadvantages in the case of an incandescent lamp of the type mentioned at the outset in that this part of the main incandescent body has the shape of a loop bent out of the plane of the main incandescent body and, preferably at its tip, supported. Here, the mounting point of the main incandescent body can be selected as a result of the loop, electric two-filament incandescent lamp
for automobile headlights

Applicant:

NV Philips' Gloeilampenfabrieken,
Eindhoven (Netherlands)

Representative: Dr. rer. nat. P. Roßbach, patent attorney,
Hamburg 1, Mönckebergstr. 7th

Claimed priority:
Netherlands 24 July 1954

Leo Henricus Verbeek, Eindhoven (Netherlands),
has been named as the inventor

that there is sufficient space available for the holding member attacking there. The holding organ can be housed in the lamp in various ways; it can e.g. B. by means of an insulating body, z. B. a glass bead to be attached to one of the other pole wires. With an advantageous Embodiment of the invention is the loop of the main incandescent body by an in the lamp pinch foot fused holding wire supported.

If in the present case an arcuate main incandescent body is mentioned, it is this term is to be understood to refer to all those embodiments in which the Attachment points of the ends of this main incandescent body are further away from the screen than the middle one closed part of the incandescent body. The incandescent body can, for. B. V-shaped or U-shaped.

So that in the lamp according to the invention despite the presence of the loop in the main incandescent body a Light distribution is obtained that of the known lamp with main incandescent body without a loop and thus the additional material stresses generated by the loop in the incandescent body are kept low, is the loop according to an advantageous embodiment of the invention a non-coiled part of the main incandescent body or, in the case of a double-coiled main incandescent body, in In a known manner, a part of the main incandescent body that is at most simply wound in a helical manner.

909 578/187

3 4

The incandescent body can, for. B. a straight, arched in shape and supported. At the outermost point 14 °

have bent wire part in a loop. this loop is an eyelet 15 around the support

To promote the dimensional stability of the main glow loop provided, which has a glass bead 16 and

According to a further advantageous embodiment, a piece of wire 17 is supported on the pole wire 4.

Embodiment of the lamp according to the invention ent- 5 In this way it is ensured that the main glow

opposite winding directions for those parts body much better its original shape

of the main incandescent body is provided, between which and position is maintained. Namely, the loop prevents

the loop is located. also that the incandescent body in the direction transverse to

The present invention is particularly able to move in the longitudinal axis of the lamp,
those cases of advantage in which the main incandescent io In the embodiment of FIG. 2 are for some reason large in the body and lamp pinch foot 25 three pole wires 26, 27 and 28 must be correspondingly heavy. This is e.g. B. the and an additional wire 29 melted. This is the case when the operating voltage for the incandescent body in the lamp wire 29 is not 12 V or more. bars connected. The extended part of the pole wire

The invention is explained in more detail with reference to the drawing

explained. partially surrounds; the end 31 ^{a of} this incandescent body is

1 and 2 show perspective embodiment, electrically conductively connected to this screen 30, forming the frame of a lamp according to the invention. The other end 31 ^{& of} the incandescent body 31 is at the end for motor vehicle headlights, the main 28 ° of the pole wire 28 being attached, which, as can be seen from the drawing incandescent body additionally supported by the loop, is partly below the screen; 30 and partly around the side edge of this screen

FIGS. 3 and 4 show on an enlarged scale around the circumference and in this embodiment

From a perspective, two embodiments of main glow ends behind the head surface 32 of the screen 30. Of the

bodies of the lamp according to the invention; Main glow body 33, whose ends 33 ^a and 33 ^& to the

Fig. 5 shows a device around a pole 26 and 27 are attached ^{without connecting 2 5, has one of its}

rule piece wound incandescent body having such ^ner plane bent loop 34 on the support wire

To provide loop. ^{29 is} attached. This bracket ensures that the

In the embodiment according to FIG. 1, 1 main incandescent body 33 denotes the lamp pinch foot, in which the position prescribed for cars is maintained as far as possible, even when the lamp is in operation,
In the usual way, three pole wires 2, 3 and 4 have been melted in an enlarged manner. Between the pole wires 2 and 3 system scale. From this figure it can be seen that the main incandescent body 5 is stretched out in an arc-like manner. that between the helically wound-As can be seen from the figure, the pole wire 3 long parts 40 and 41 of this incandescent body is not smaller than the pole wire 2 and has a helically wound part 42 at its end, a screen 6 which supports the auxiliary incandescent body 7 partially surrounds. 35 is. If the parts 40 and 41 were each to be screwed twice - one end 7 ° of this auxiliary glow body is wound on the line in the shape of a line, ie the main glow body screen 6 would be attached; while the other end 7 ^& per is twisted twice, for the part 42 one of the incandescent body 7 with the single helical turn over the top surface 8 of the single helical turn, ie a screen 6 curved part 4 ° of the pole wire 4 is sufficient, or the part 42 is is not bound at all. Between the bend 4 ^{a of} the pole wire 4 40 helically wound, but consists of and the head surface 8 of the screen 6 is an insulated an originally straight wire part. The glow element connection, which consists of the metal wire pieces according to FIG. Winding machine are produced, the control mechanism for the good effect of a motor vehicle lamp, 45 is set in such a way that the helically wound parts (40 and 41) with a main incandescent body and an auxiliary incandescent body are alternately provided, it is, as already mentioned, him - and straight spacers are formed. This desired that both the middle part of the main incandescent element intermediate pieces can then, in sequence, body 5, which is closest to the screen 6, serve as to form the loop 42, or also the part of the auxiliary incandescent body 7, which is on the The ends 43 and 44 are to be used next 5 °, which are to be attached to the pole wires adjacent to the rear of the main filament.

barten end 13 of the screen is as close as possible to- In the embodiment of FIG

lie to each other, so that these parts in a possible filament parts 45 and 46, between which the

small distance from the loop 47 denoted by F in Fig. 1, opposite winding direction

Neten focal point of the parabolic 55 not shown. This embodiment promotes the shape

cal reflector can be attached. strength of the mantle to a high degree.

If, for example, as a result of the operating voltage of the lamp, Fig. 5 shows how one without interruptions of the main incandescent body 5 relatively large dimensioned single or multiple wound incandescent body 48 is sen, it is possible that the main incandescent body 5, simply with a loop can provide. Dawenn no special precautions are taken, ^6o of the incandescent body to be supported on a table after a certain period of operation starts durchzuhän- between its parts ^49a and unto a slot 49 ^&. This phenomenon is, of course, has the Mei- 50, and then the The action of a pressure element 51 is most pronounced in the vicinity of the focal point F, which is just above the slot 50, namely at the point that is farthest from the order. When moving downward this compression fastening points 5 ° and 5 ^{6 of} the main incandescent body 5 to 65 organs are removed depending on the width of the pole wires 2 and 3. The present slot 50 of the table which is above this invention overcomes this evil by this part of the slot located turns of the pressure main incandescent body 5, the in the immediate vicinity of the organ 51 is pressed into this slot, which of the screen 6 is, with a Loop 14 provided there existing helical windings, which are bent from the plane of the main incandescent body 5 70. This creates an incandescent body

per with helically wound parts 52 ° and 52 ⁶ and a bent loop 53 located between them.

Claims (4)

Patent claims: 1. Electric two-filament incandescent lamp for motor vehicle headlights with a helical shape coiled, arched main incandescent body, which is provided in the lamp, the auxiliary incandescent body partially surrounding the screen is turned and its close to the Part of the screen lying in the headlight near the focal point of the reflector in its center is supported, characterized in that this part of the main incandescent body has the shape of one of the Plane of the main incandescent body bent and, preferably at its tip, supported loop Has. 2. Incandescent lamp according to claim 1, characterized in that the loop is a non-coiled part of the main incandescent body. 3. Incandescent lamp according to claim 1, characterized in that with a double-coiled main incandescent body the loop is a simply helically wound part of the main incandescent body is. 4. Incandescent lamp according to one of the preceding claims, characterized in that the parts of the main incandescent body, between which the loop is located, opposite winding directions to have. Considered publications:
German Patent No. 499 214;
French Patent No. 544,689;
U.S. Patent Nos. 2,018,470, 2,597,681. 1 sheet of drawings © 909 578/187 7.59