DE2220715A1 - Plastic wiper blade for windscreen wipers - Google Patents

Description

Plastic wiper blade for windscreen wipers

The present invention relates to a wiper blade made of transparent Plastic for windshield wipers for vehicles, which consists of a support bracket and a tubular, through the support bracket wiping element held under tension consists.

Previous attempts, wiper blades from possibly transparent Producing plastic for windshield wipers has not given a satisfactory result, in particular because those necessary to ensure correct and permanent contact between the wiper element and the frequently curved windshield Parts are relatively complicated. Taking into account the above requirements, the mounting bracket had to consist of several There are parts, including the elements used to exert the necessary pressure or tension on the wiping element belonged. This had a high manufacturing cost, an extraordinary one Sensitivity and tendency to break as a result. In addition, the replacement of the wiping element was relatively long and complicated work.

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A'Jr .: ΠΙΆΓΓΝΤ - Augsburg Postscheckkonto Munich 86510

209846/0892

Deutsche Bank AG Augsburg Account No. 08 34 192 Uankleil number 720 700 01

The object of the invention is to provide a wiper blade for windshield wipers of the type mentioned to create which. has the following properties:

- Can be manufactured entirely from transparent plastic, reducing the visual disturbances for the vehicle driver to a minimum;

- minimum number of components;

- manufacturability with very low manufacturing costs;

- easy replaceability of the wiping element.

In a further embodiment of the invention, the wiper blade should produce minimal noise during operation, even when it is dry or less humid Create windshield.

This object is achieved according to the invention in that the wiper blade from a one-piece, made of transparent plastic support bracket, which both the means for tensioning the wiper element, as well as the means for anchoring the last one, and a wiping element passed through a tube of clear flexible plastic is formed and has anchoring members for connection to the bracket at its ends. Preferably, the cooperating anchoring members of the bracket and the wiping element are designed such that they one form simple coupling and hooking device that by exerting a force sufficient to elastically deform the parts can be uncoupled. Furthermore, the tubular wiping element is preferably sealed at the ends by the coupling elements mentioned closed and filled with a transparent and preferably colorless liquid, e.g. water.

The invention will now be described with reference to some in FIG

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Enclosed drawing schematically illustrated Ausführungs.ungsformen explained in more detail * the only as non-limiting exemplary embodiments are to be considered.

Show it

Fig. 1 is a side view on a reduced scale of an inventive, wiper blade attached to a windshield for windscreen wipers,

Fig. 2 is a partial view in almost natural size of a second embodiment of the bracket according to the invention,

Fig. 3 cross-sections along the lines III-III and IV-IV of and 4 Fig. 2,

Fig. 5 is a view of the interlocking coupling members of the bracket and the wiping element, and

6 shows some possible embodiments of an end part of the boy 9 gels according to the invention.

As can be seen from FIG. 1, a wiper blade according to the invention for windshield wipers has a mounting bracket 1 and a mounting bracket on this arranged wiping element 7. The bracket 1 is made of a transparent, resistant and elastically deformable Plastic made, which e.g. can be an aromatic polycarbonate. The bracket 1 has in a more or less central point on an articulation means 2, whereby he marries in and of itself known and not dargestell th support and operating lever is hinged on the drawing, which is advantageous can be made from the same material as the bracket 1. In the area of each of its ends, the bracket 1 an arc-shaped support part 3 * whose task it is that the Part of the wiping element 7 executing the wiping effect in one

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correct position against the windshield to be wiped O to hold without any part of the bracket coming into contact with the windshield itself. On this arch-shaped Part 3, slightly protruding side tabs 4 are provided, which form a recessed seat in which the tube of the Wiping element can be received, which is thereby secured against lateral displacement. The more or less straight forward extending part of the bracket 1 between the articulation means 2 and the arcuate end parts 3 can, as in Pig. I. shown, consist of solid material, or, as in the variant of FIG. 2, provided with holes 5 for the purpose of simplification be. The parts of the bracket 1 made of solid material can be rectangular or preferably rounded or elliptical cross-section according to FIG. 3, which reduces the air resistance against the movement and is intended to improve the appearance from an aesthetic point of view.

In addition to the arcuate support part 3, each has The end of the bracket 1 also has an anchoring means, which expediently consists of a fork-shaped part 6, the Arrangement will be explained later.

The wiping element consists of a tubular part 7 made of flexible and transparent plastic, e.g. PVC with a high elastic limit, at the ends of each an anchoring member 8-9 is fixedly arranged, which is expediently made of a T-shaped The same material as the bracket 1 existing element can be formed, which one hammered into the end of the tube 7 and a glued-in shaft 8 and a cross arm 9 suitable for hooking onto the fork-shaped coupling element 6 of each end of the bracket 1. The tubular element 7 becomes tangential to the two arched parts 3 of the bracket angeord * net, bent around these arched support parts 3 and by means of the ends equipped with the organs 8-9 hooked onto the coupling elements 6 of the bracket 1. For this purpose the forked

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shaped coupling elements 6 arranged in such a way that it crosses the tangent to the arcuate part 3 * after which the tubular element 7 is positioned when bending in the direction of the corresponding fork β and has its own end bent or arranged at right angles to said tangent that the Cross arm 9 located at the end of the wiping element, after it has been hooked onto the corresponding fork 6, no longer shows any tendency to uncouple. The total length of the wiping element between the two cross arms 9 is chosen so that the arcuate support parts 3 must be elastically compressed to carry out the hooking described above, while the tubular element 7 is placed under elastic tension, and that after the hooking has been carried out, the resilient effect of the arcuate parts (and, to a lesser extent, that of the entire bracket 1) holds the wiping element 7 under a suitable tension, which can be, for example, of the order of 1.5 to 3 kp. This elastic tension ensures that the wiper element 7 rests correctly on the windshield O ₄ to be wiped, even if it is curved, as FIG. 1 shows. The extreme simplicity of the uncoupling and coupling handling, which is required to replace the wiping element 7 in the event of wear or any damage, is therefore clearly evident.

The formation and establishment of the arcuate part 3 and

the coupling fork 6 at the ends of the bracket 1 can be extremely different be it for technical or aesthetic or commercial reasons. There are some on the accompanying drawing represented by the many possible trainings and facilities.

According to Fig. 1, the coupling fork 6 is arranged at the end of the bracket 1, wherein the arcuate Stutζteil 3 from the bracket before The end of the same goes out, runs more or less circularly and is directed towards the fork 6.

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After Pig. 2 is the coupling fork 6 from the end of the bracket 1 bent and the arcuate support part 3 goes out slightly in front of the fork 6 and is in the opposite direction Regarding the latter directed.

According to Fig. 6, the arcuate part 3 is similar to that 1 is arranged at the end of the bracket 1, and the coupling fork 6 is slightly back. The arched part could.also be closed ring-shaped in FIG. 4a, in which case the tension of the wiping element is mainly through the elasticity of the bracket 1 and the tubular element 7 is ensured.

According to Fig. 7, the arcuate part 3 has an S-shaped course, which significantly increases its elasticity. The device in Fig. 8 is similar to the device shown in Fig. 1, with the difference, however, that the arcuate part 3 in runs in the opposite direction and is elongated. In the device of Fig. 9, the coupling fork is related on the arcuate part 3 shifted substantially backwards along the bracket 1, the part 3 directly the end of the bracket 1 forms.

Advantageously, through the shaft 8 of each coupling member of the wiping element, the corresponding end of the tubular Element 7 tightly closed, and the latter is coated with a transparent and preferably colorless liquid 10, e.g. Water, filled. Since the tube 7 is pressed in slightly in the area bent over on the curved part 3 of the bracket 1, in this way, the liquid 10 located inside it is pressurized, keeping the tubular element 7 in the "inflated" State and thereby favors the effective application of the same to the windshield 0. The presence of the liquid also causes a dampening of the vibrations and a particularly silent running of the wiper blade, even if it is

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dry or very dirty parts of the windshield acts. As a result, the movement of the wiper blade, thanks to the fact that the parts are made of transparent, becomes unsteady when it rains material that becomes almost invisible, is not very disruptive from a visual point of view, and also almost undisturbed from a acoustic point of view.

209846/0892

Claims (8)

Claims (l . ■ Wiper blade made of transparent plastic for windshield wipers for vehicles, which consists of a support bracket and a wiper element arranged on the support bracket, characterized in that the support bracket (l) in a single piece with means (j5) for exerting an elastic tension the wiping element and is made with means (6) for hooking the ends of the wiping element onto the support bracket, said tensioning means (5) and hooking means (6) arranged near the two ends of the bracket (l) are, and that the wiping element consists of a tubular element (7), which has coupling members (8,9) at both ends, which are suitable for working with the hooking means (6) of the bracket (1). 2. Wiper blade according to claim 1, characterized in that that the bracket (l) consists of a transparent, high resistance and elastic flexibility owning plastic, such as an aromatic polycarbonate in particular. 5 wiper blade according to claim 1, characterized in that that the tubular element (7) made of a flexible and elastic plastic, such as in particular an aromatic, polyvinyl chloride having a high elastic limit. 4. Wiper blade according to claims 1 and j5, characterized in that each of the tension center] (Ji) consists of an arcuate part of the bracket (l), which part is arranged such that it is a tangent in the direction of the other arcuate part (3) of the bracket (l) and one 209846/0892 has another tangent in the direction of the corresponding coupling means (6). 5 · wiper blade according to claim 4, characterized in that a piece of the arcuate part (3) something has protruding tabs (4) which for guiding the .from one to the other of said parts (j5) extending to these parts are bent around and determined in the area of the wiping element (7) ending in the area of the coupling means. 6. Wiper blade according to Claims 1 and 3 *, characterized in that each coupling means (6) of the bracket (l) consists of an angularly arranged fork or fork with a bent end. 7. wiper blade according to claims 1 and 3, characterized g e mark Chnet that each coupling means (8,9) of the wiping element (7) consists of a T-shaped element consists, the one in the corresponding end of the tubular element (7) switched on and preferably glued or welded shaft (8) and a cross arm (9) arranged on both sides of the shaft (8) at the outer end thereof. 8. Wiper blade according to claim 7, characterized in that that each of the coupling means (8,9) tightly closes the corresponding end of the tubular element (7), and that the latter ..? with a transparent and preferably colorless liquid - (lo), such as water, is filled. 2 π <) a h η / υ β η: ' AO Blank page