DE19940491A1 - Wiper blade for cleaning a window on a vehicle - Google Patents

Abstract

The invention relates to a wiper blade for cleaning a window on a vehicle with a support frame with at least two claws (5) for holding and guiding a rubber-like wiper strip (6), which is curved in particular in plan view, the support frame having at least one claw bracket (4) with a claw ( 5) has at least one bracket end and the claw bracket (4) can be connected to a wiper arm (1) or to a further bracket (2, 3) of the bracket at a distance from the claw (5) via a swivel bearing (13) oriented transversely to the longitudinal direction of the bracket Support frame is connected, the claw (5) a claw base (8) opposite the back of the wiper strip (6), two claw walls (9, 10) arranged on the claw base (8) and leading the opposite longitudinal sides of the wiper strip (6) the claw walls (9, 10) arranged, partially encompassing the wiper strip (6) or partially engaging in the longitudinal grooves on the wiper strip (6) claw attachments (11, 12) au find. The wiper blade is characterized in that the two claw attachments (11, 12) of at least one of the claws (5) are arranged at different distances from the pivot bearing (13) of the claw bracket (4) when projected onto the window.

Description

The invention relates to wiper blade for cleaning a window on a vehicle with a support frame with at least two Claws for holding and guiding one in particular Top view curved rubber-like wiper strip, the Support frame at least one claw bracket with a claw has at least one bracket end and the claw bracket at a distance from the claw across a Swing bearing aligned longitudinally with one Wiper arm connectable or with another bracket of the Support frame is connected, the claw one Back of the wiper strip opposite claw base, two arranged on the claw base, the opposite Long sides of the wiper strip leading claw walls and the claw walls arranged, the wiper strip partially encompassing or in existing longitudinal grooves on the wiper strip have partially engaging claw attachments.

A wiper blade with such a claw has long been for example from US 1,197,338, known and found in almost every windshield wiper device used today for Cleaning a window on a motor vehicle use. The wiper strip of such a wiper blade is in the Claws can be moved longitudinally at least to a limited extent arranged that an adjustment of the elastic wiper strip  largely to the surface shape of the window to be wiped is made possible. The arranged on a claw bracket Claws are used to guide the wiper strip along the to wipe the window and to transfer the necessary Pressing force on the wiper strip, the washer also can have a curved shape. It is with the Designing claws to take into account that these are the Wiper strip or its back strip as narrow and lead precisely. Nevertheless, the wiper strip must be in the claw have enough play to allow for longitudinal displacement Allow wiper strip in the claw.

However, such known wiper blades have the disadvantage on that they are for wiper strips curved in plan view are unsuitable. Such wiper blades are predominant used on vehicles for stylistic reasons For example, the wiper blade on a curved edge Adjust vehicle window.

Known wiper blades can due to the conflict of objectives, on the one hand a close and precise guidance of the wiper strip and on the other hand enough play in the claw for a free one Movability of the wiper strip bent in plan view enable the demand for good wiping quality don't do it justice. When using known claws the wiper strip is stuck either due to its bend or it swims in the claw because of the too much play, so that optimal guidance and longitudinal displacement the wiper strip is not guaranteed. The consequence is one unsatisfactory wiping result.

The present invention is therefore based on the object based on a wiper blade with claws at least partial inclusion of a rubber-like wiper strip create good leadership and good Longitudinal displacement of the rubber-like wiper strip in the  Claws at straight especially in plan view as well curved wiper strips is guaranteed.

To solve the problem, a wiper blade is used at the beginning described type proposed in the projection on the washer the two claw attachments at least one of the Claws at different distances from that Swivel bearings of the claw bracket are arranged.

The claw designed according to the invention can various supporting frame or bracket constructions be used. A person trained in accordance with the invention can thus Claw bracket, for example, directly on the wiper arm articulated main bar with one claw on each End or one hinged to a parent bracket Claw bracket with one claw at one end or one Bracket with a claw on only one end and one Claw bracket at its other end. It can also Carrying frame of a wiper blade have two brackets that each connected at one end via a joint and at least one of these brackets on its other End has a claw designed according to the invention. The Invention is also intended to wiper blades with such Support frame or bracket structures include where the claw or claws are not on the underside of the Arranged bracket, but for example laterally on or are arranged or formed laterally from the bracket.

Furthermore, it should be clarified that the invention Wiper blades for all possible panes, such as Windshields, rear windows, side windows, (general Viewing panes), headlight panes, rear lamp panes, Reflectors and the like, at different Vehicles, especially motor vehicles, are used can.  

The wiper blade according to the invention has the advantage that optimal adjustment and guidance of the rubber-like Wiper strip on the window both in the top view not curved as well as curved in plan view Wiper strips is guaranteed. A jamming of the Wiper strip in the claw, as is known in the art can occur with curved wiper strips, can wiper blade according to the invention does not take place.

An advantageous embodiment of the invention provides that the distance z between the one facing the pivot bearing Front of the claw attachment, which is projected on the disc from the swivel bearing of the claw bracket is located away, and the pivot bearing opposite end of the other claw approach larger or is zero.

The relevant one for a wiper strip bent in plan view Cross section is calculated from the width b of the claw and the opening dimension e of the claw relevant for the wiper strip. The opening dimension e is determined as the hypotenuse of the Triangle with the distance z and the cathets Claw width b. It follows that if z is greater than or is zero, the claw opening dimension e is larger or equal to the claw width b. Hence, is ensures that the curved for the top view Wiper strip relevant cross section of the claw according to the invention is always greater than or equal to the claw width, in particular even with strongly curved wiper strips. Through the necessary Freedom of the wiper strip is a longitudinal movement of the Wiper strip always possible and jamming of the wiper strip does not take place, which makes a correspondingly good one Wiping result is achieved.

According to a further embodiment of the invention Wiper strip bent in plan view and is the one on the  Claw attachment arranged on the outside of the wiper strip bend in projection onto the disc from the swivel bearing of the Claw bracket arranged further away than that on the Arranged inside the wiper strip bend Claw attachment. Such a development of the invention has in particular the advantage that with the corresponding in Top view of curved wiper strip optimal guidance of the Wiper strip through the claw attachments as well Claw walls is guaranteed.

A variant of the invention provides that in projection on the disc both claw attachments in the area between the swivel bearing of the claw bracket and the swivel bearing facing side of the claw base are arranged, wherein the distance d1 or d2 between the pivot bearing facing side of the claw base and the Front facing away from the pivot bearing at least one of the two claw approaches is greater than or equal to zero. A such a variant of the invention has the particular advantage that even with curved panes an optimal adjustment and Guiding the rubber-like wiper strip bent in plan view is guaranteed on the window to be wiped. A Jamming of the wiper strip in the claw between the The claw base and the claw approaches is according to the invention not possible.

According to an advantageous embodiment of the invention, in Projection onto the disc the distance d1 or d2 between the side of the claw base facing the pivot bearing and the end facing away from the pivot bearing in both Claw attachments greater than or equal to zero. This will make one uniform guidance and power transmission of the wiper strip the disc allows.

An embodiment of the invention provides that the Wiper strip facing side of the claw base and / or the  side of the claw attachments facing the wiper strip on the space outlined by the claw convex inwards is arched. Such a curvature enables the longitudinal displacement of the wiper strip, especially at Discs with different curvature is improved.

In another embodiment of the invention they are the Wiper strip facing sides of the claw walls on the space outlined by the claw convex inwards arched. Through these curvatures, the Longitudinal displacement of the wiper strip in the claw at in Top view of curved wiper strips improved.

Further advantageous configurations and details are the following description, in which the Invention based on that shown in the drawing Embodiment is described and explained in more detail.

Show it:

Fig. 1 shows a wiper arm of a windscreen wiper device in side view,

Fig. 2 is a claw brackets of a known wiper blade in side view,

Fig. 3 is a claw of a known wiper blade in plan view,

Fig. 4 is a claw of a wiper blade according to the invention in top view,

FIGS. 5 and 6 two different claws of a wiper blade according to the invention in side view and plan view,

FIGS. 7 and 8, a claw of another wiper blade according to the invention in side view and plan view.

Fig. 1 shows an example of a wiper lever 1 of a known windscreen wiper device for cleaning a pane of a motor vehicle having a main bracket 2 are disposed symmetrically to the two brackets 3, which are in turn connected to claw brackets. 4 The claw brackets 4 are articulated with respect to the brackets 3 by means of the pivot bearings 13 . The claw brackets 4 each have two claws 5 on their side facing away from the main bracket 2 . The claws 5 receive a wiper strip 6 , which can be reinforced in particular by spring rails, not shown, in the longitudinal grooves of the wiper strip.

FIG. 2 shows a known claw bracket 4 with the pivot bearing 13 , a known claw 5 being arranged at the ends of the claw bracket 4 . These claws 5 take attention to the wiper strip 6, the side facing away from the claw support 4 has a wiping edge. 7

Fig. 3 shows a portion of a stirrup with a 4 arranged thereon known claw 5 in plan view. The claw 5 has a claw base 8 arranged on the claw bracket 4 , on which there are two claw walls 9 and 10 which guide the wiper strip 6 laterally. On the claw walls 9 and 10 on the side facing away from the claw base 8 there is a claw attachment 11 and 12 , the claw attachments 11 and 12 at least partially encompassing the wiper strip 6 with the wiper strip width y which is bent in plan view. The claw 5 has the claw width b.

The basic prerequisite for a longitudinal displacement of the wiper strip 6 in the claw 5 is that the claw width b is larger than the wiper strip width y. As is clearly visible in Fig. 3, however, is in in plan view curved wiper strip 6 is not the claws width b for the longitudinal displacement of the wiper strip 6 the only decisive factor, but also Fig. 3 removable Krallenöffnungsmaß e which, after from the distance between the tangent at the on the outside of the curved side of the wiper strip 6 at the point of contact C with the one claw wall 9 and the point of contact D of the opposite wiper strip side with the other claw wall 10 . According to the prior art, the claw width b is always greater than the claw opening dimension e.

To ensure optimal guidance and power transmission of the wiper strip 6 to the window, the claw width b must not be much larger than the wiper strip width y. However, this has the consequence that the claw opening dimension e is in turn only slightly larger than the wiper strip width y, which allows only a slight bend in the wiper strip 6 in plan view and leads to a jamming of the wiper strip 6 in the claw 5 with a greater bend. If the claw width b is chosen to be considerably larger than the wiper strip width y in order to enable a greater bend in the wiper strip 6 , the wiper strip 6 begins to swim in the claw 5 . This results in poor wiping of the window.

The claw 5 shown in FIG. 4 of a wiper blade according to the invention differs from the prior art in that the two claw attachments 11 and 12 are arranged at a different distance from the pivot bearing 13 of the claw bracket 4 when projected onto the window. The embodiment shown in Fig. 4 also stipulates that the distance z from the pivot bearing 13 facing end face 14 of the claw projection 11, which is so arranged further away in projection on the disc of the pivot bearing 13 of the stirrup 4, to which the pivot bearing 13 facing end face 15 of the other claw attachment 12 is greater than zero. In contrast to the prior art, the claw opening dimension e is now larger than the claw width b. One arrives at the triangle with the two claws of the claw width b and the distance z between the two end faces 14 and 15 of the claw attachments 11 and 12 as well as with the hypotenuse of the claw opening dimension e. With this, e is calculated as follows:

e = √b2 + z2

The dimension e with z greater than zero is therefore always greater than b.

If the claw width b selected is only slightly larger than the width y of the wiper strip 6 , the described geometries do not cause the wiper strip 6 to jam in the claw 5 even when the wiper strip 6 is strongly bent in plan view. It is thereby achieved that the power transmission and guidance as well as the associated longitudinal displaceability of the wiper strip 6 in the claw 5 is ensured regardless of the degree of the wiper strip 6 bent in plan view.

In FIG. 4 it can also be seen that claw 5 is designed such that the two claw attachments 11 and 12 are arranged or formed symmetrically with respect to an imaginary axis 19 which runs perpendicularly through the center of claw 5 . This has 4 advantages in particular in the manufacture of the claw bracket.

In FIG. 5, the claw 5 is shown a wiper blade according to the invention in two different embodiments in side view and in the right part of FIG. 5 in front view. The left part of FIG. 5 shows a claw 5 with the claw base 8 , on which the two claw walls 9 and 10 are arranged side by side in parallel, so that the distance z is present between them. At the ends of the claw walls 9 and 10 facing away from the claw base 8 , the two claw projections 11 and 12 are respectively present.

The middle embodiment shown in FIG. 5 shows the claw bracket 4 with the pivot bearing 13 and the claw 5 in a side view. The two claw walls 9 and 10 are arranged on the claw base 8 in a spreading shape. At the ends of the claw walls 9 and 10 facing away from the claw base 8, the claw projections 11 and 12 are respectively present. The claw lugs 11 and 12 are at a distance z from one another.

In the right part of FIG. 5, a claw 5 according to the invention is shown in front view, which has the claw base 8 , the claw walls 9 and 10 and the two claw extensions 11 and 12 . Here, a trapezoidal claw 5 is shown with continuous lines and a rectangular claw 5 is indicated with dotted lines. Both types of claw are widely used and can be designed according to the invention.

In FIG. 6, another embodiment of a claw 5 of the present invention is shown. The side of the claw base 8 facing the wiper strip, not shown, and the sides of the claw extensions 11 and 12 facing the wiper strip are arched into the space circumscribed by the claw, ie convex inwards. In addition, as can be clearly seen in the lower part of FIG. 6, the sides of the claw walls 9 and 10 facing the wiper strip are also curved into the space circumscribed by the claw, ie convex inwards. Such curvatures advantageously ensure that an improved adaptation of the curved wiper strip 6 to the claw 5 guiding the wiper strip and thus a better longitudinal displacement of the wiper strip 6 in the claw 5 is made possible, which results in a correspondingly good wiping result.

FIGS. 7 and 8 show another embodiment of a claw 5 of the invention. FIG. 7 shows the embodiment in side view, FIG. 8 in top view. The wiper strip 6 is not only curved in a top view, as shown in FIG. 8, but also curved in a side view, as is clear from FIG. 7, in order to adapt to a curved window to be wiped. Curved pane sections are often found in motor vehicles in particular at the pane edges. Even with such wiper blades, it is necessary to guide the wiper strip 6 as precisely as possible and to ensure good longitudinal displaceability in the claws.

As can be clearly seen in FIG. 8, the distance z is present between the two claw attachments 11 and 12 . This distance allows a good adaptation of the claw 5 to the wiper strip 6 bent in plan view.

In addition, the distances d1 and d2 from the end face 16 of the claw base 8 facing the pivot bearing 13 to the end faces 17 and 18 of the two claw extensions 11 and 12 facing away from the pivot bearing 13 are greater than zero. This prevents jamming of the wiper strip 6 curved in side view in the claw 5 according to FIGS . 7 and 8.

Advantageously, the claws 5 shown in FIGS. 7 and 8 are also suitable for using wiper strips which are not curved in plan view and / or wiper strips which are not curved in side view.

All in the description, the following claims and Features shown in the drawing can, both individually, as well as in any combination with each other be essential.  

Reference numerals

1

Wiper lever

2nd

Main bracket

3rd

hanger

4th

Claw bracket

5

claw

6

Wiper strip

7

Wiping edge

8th

Claw bottom

9

Claw wall

10th

Claw wall

11

Claw attachment

12

Claw attachment

13

Swivel bearing

14

Face

15

Face

16

page

17th

Face

18th

Face

19th

axis
a claw height
b Claw width
c opening dimension (high)
e opening dimension (wide)
y Wiper strip width
C point of contact
D point of contact

Claims (7)

1. wiper blade for cleaning a window on a vehicle with a support frame with at least two claws ( 5 ) for holding and guiding a rubber-like wiper strip ( 6 ), which is curved in particular in plan view, the support frame having at least one claw bracket ( 4 ) with a claw ( 5 ) having at least one strap end and the claw yoke (4) in a distance from the claw (5) via a transversely oriented to the strap longitudinal direction of the pivot bearing (13) connectable to a wiper arm (1) or with a further yoke (2, 3) of the supporting frame The claw ( 5 ) is a claw base ( 8 ) opposite the back of the wiper strip ( 6 ), two claw walls ( 9 , 10 ) arranged on the claw base ( 8 ), the opposite longitudinal sides of the wiper strip ( 6 ), and on the claw walls ( 9 , 10 ) arranged, partially engaging around the wiper strip ( 6 ) or partially engaging in the longitudinal grooves on the wiper strip ( 6 ) have etches ( 11 , 12 ), characterized in that the two claw projections ( 11 , 12 ) of at least one of the claws ( 5 ) are arranged at different distances from the pivot bearing ( 13 ) of the claw bracket ( 4 ) when projected onto the disk. 2. Wiper blade according to claim 1, characterized in that the distance z between the end of the pivot bearing ( 13 ) facing ( 14 ) of the claw attachment ( 11 ), which in projection onto the disc from the pivot bearing ( 13 ) of the claw bracket ( 4 ) further is arranged remotely, and the end face ( 15 ) of the other claw attachment ( 12 ) facing away from the pivot bearing ( 13 ) is greater than or equal to zero. 3. Wiper blade according to claim 1 or 2, characterized in that the wiper strip ( 6 ) is bent in plan view and that in projection on the disc arranged on the outside of the wiper strip bend claw attachment ( 11 ) from the pivot bearing ( 13 ) of the claw bracket ( 4th ) is arranged further away than the claw attachment ( 12 ) arranged on the inside of the wiper strip bend. 4. Wiper blade according to one of the preceding claims, characterized in that when projected onto the disc, both claw attachments ( 11 , 12 ) in the region between the pivot bearing ( 13 ) of the claw bracket ( 4 ) and the side (16) facing the pivot bearing ( 13 ) ) of the claw base ( 8 ) are arranged, the distance d1 or d2 between the side (16) of the claw base ( 8 ) facing the pivot bearing ( 13 ) and the end face ( 17 or 18 ) facing away from the pivot bearing ( 13 ) of at least one of the two claw attachments ( 11 , 12 ) is greater than or equal to zero. 5. Wiper blade according to claim 4, characterized in that the distance d1 or d2 is greater than or equal to zero in both claw attachments ( 11 , 12 ). 6. Wiper blade according to one of the preceding claims, characterized in that the side of the claw base ( 8 ) facing the wiper strip ( 6 ) and / or the side of the claw attachments ( 11 , 12 ) facing the wiper strip ( 6 ) with respect to that of the Claw ( 5 ) circumscribed space is convex inwards. 7. Wiper blade according to one of the preceding claims, characterized in that the sides of the claw walls ( 9 , 10 ) facing the wiper strip are convexly curved inwards with respect to the space circumscribed by the claw ( 5 ).