Title: Wiper blade for cleaning panes of glass, particularly in motor vehicles
Abstract: A wiper blade is proposed which is used to clean windows, especially of motor vehicles. The wiper blade is displaceable transversely to its length, preferably about a pendulum axis, and can be pressed with an elongated, rubber-elastic wiper strip (46) against the window (54) to be wiped; the wiper strip is disposed on the lower band face (49), oriented toward the window, of a bandlike-elongated, spring-elastic support element (42). Chattering that occurs during wiping operation and causes an unsatisfactory outcome of wiping as well as considerable noise, is avoided if the region of the upper band face (43), remote from the window, of the support element (42), the wiper blade is provided with a mass body, which is disposed movably, at least in the displacement direction (74) of the wiper blade.
Patent Number: 7,007,339 Issued on 03/07/2006 to Weiler, et al.
| Inventors:
|
Weiler; Michael (Karlsruhe, DE);
Zimmer; Joachim (Sasbach, DE)
|
| Assignee:
|
Robert Bosch GmbH (Stuttgart, DE)
|
| Appl. No.:
|
275608 |
| Filed:
|
February 26, 2002 |
| PCT Filed:
|
February 26, 2002
|
| PCT NO:
|
PCT/DE02/00702
|
| 371 Date:
|
November 7, 2002
|
| 102(e) Date:
|
November 7, 2002
|
| PCT PUB.NO.:
|
WO02/074591 |
| PCT PUB. Date:
|
September 26, 2002 |
Foreign Application Priority Data
| Mar 16, 2001[DE] | 101 12 658 |
| Current U.S. Class: |
15/250.201; 15/250.48; 15/250.43 |
| Current Intern'l Class: |
B60S 1/38 (20060101) |
| Field of Search: |
15/250201,250.48,250.41,250.451,250.44,250.43,250.361,250.452
|
References Cited [Referenced By]
U.S. Patent Documents
| 2794203 | Jun., 1957 | Oishei.
| |
| 3238555 | Mar., 1966 | Cels.
| |
| 3418679 | Dec., 1968 | Barth et al.
| |
| 3961395 | Jun., 1976 | Journee.
| |
| 4063328 | Dec., 1977 | Arman.
| |
| 4361927 | Dec., 1982 | Matsui et al.
| |
| 4722112 | Feb., 1988 | Schaub et al.
| |
| 5206969 | May., 1993 | Patterson et al.
| |
| Foreign Patent Documents |
| 32443 | Mar., 1956 | DE.
| |
| 1 505 257 | Jun., 1969 | DE.
| |
| 2 122 678 | Nov., 1972 | DE.
| |
Primary Examiner: Graham; Gary K.
Attorney, Agent or Firm: Striker; Michael J.
Claims
What is claimed is:
1. A wiper blade for cleaning windows of motor vehicles, which transversely to
its length is displaceable about a pendulum axis and which can be pressed, with
an elongated, rubber-elastic wiper strip (
46), against the window (
54)
to be wiped, and the wiper strip is disposed on the lower band face (
49),
oriented toward the window, of a bandlike-elongated, spring-elastic support element
(
42), wherein in the region of the upper band face (
43), remote from
the window, of the support element (
42), the wiper blade is provided with
a mass body (
60,
160,
260,
360,
460,
560,
660, or
760, respectively), which is disposed freely movably, and
in particular tiltably, relative to the wiperstrip and support element at least
in the displacement direction (
74) of the wiper blade, to surpress chattering
motion of the wiper blade wherein the support element (
42) has two spring
rails (
41), spaced apart from one another and extending parallel to one
another and disposed in the same plane, wherein the wiper strip, over at least
a part of its length, extends with an extension (
68) through a gap between
the two spring rails, wherein at least one mass body (
60,
160,
260,
360,
460,
560,
660, or
760, respectively) is
disposed on the extension, wherein the wiper strip has a wiper lip connected via
a tilting rib below the support element, wherein the at least one mass body is
a spoiler, and wherein the spoiler comprises a different material from the wiper
strip that is fabricated jointly with it and solidly connected to it.
2. The wiper blade of claim 1, wherein the mass body (
60,
160,
260,
360,
460,
560,
660, or
760, respectively)
is embodied in striplike fashion and extends in the longitudinal direction of the
support element (
42).
3. The wiper blade of claim 1, wherein the mass body (
60,
160,
360, or
460, respectively) has an at least approximately triangular
cross section.
4. The wiper blade of claim 1, wherein the mass body (
260), viewed in
cross section, is provided with a thickened portion (
264) on its free end
remote from the extension (
72).
5. The wiper blade of claim 1, wherein the support element (
42) in an
unstressed state, is curved in the longitudinal direction; that a connection device
(
44) for a wiper arm (
48) is located on the convex outer side (
43)
of the support element (
42); and that the wiper strip (
46) is disposed
on the concave inner side (
49) of the support element (
42).
6. A wiper blade for cleaning windows of motor vehicles, which transversely to
its length is displaceable about a pendulum axis and which can be pressed, with
an elongated, rubber-elastic wiper strip (
46), against the window (
54)
to be wiped, and the wiper strip is disposed on the lower band face (
49),
oriented toward the window, of a bandlike-elongated, spring-elastic support element
(
42), wherein in the region of the upper band face (
43), remote from
the window, of the support element (
42), the wiper blade is provided with
a mass body (
60,
160,
260,
360,
460,
560,
660, or
760, respectively), which is disposed freely movably, and
in particular tiltably, relative to the wiper strip and support element at least
in the displacement direction (
74) of the w per blade, to suppress chattering
motion of the wiper blade wherein the wiper strip has a base body (
64),
which on a side remote from the window (
54) changes over via an extension
(
68) to the mass body (
60,
160,
260,
360, or
460, respectively); and that a striplike wiper lip (
56) that can
be placed against the window and that is made jointly with the base body from a
different material than the mass body and is joined thereto via a rib strip which
is disposed on the side of the base body (
64) toward the window (
54).
7. The wiper blade of claim 6, wherein a spoiler (
500 or
260 or
600 or
700) embodied as an elongated hollow body is formed onto the
extension (
68), and located in the cavity of the spoiler is the mass body
(
560 or
760) that is joined to the extension and is movable in the
displacement direction (
74) of the wiper blade.
8. The wiper blade of claim 6, wherein viewed in cross section, the extension
(
68) of the wiper strip changes over, at the upper band side of the support
element, into a bandlike base strip (
70), with which the mass body comprising
a different material but fabricated jointly with the wiper strip, is solidly connected
via an articulated strip (
72) formed by longitudinal grooves (
71)
that are laterally open at the edges.
Description
BACKGROUND OF THE INVENTION
In certain types of wiper blades, the support element is meant to assure the
most
uniform possible distribution, over the entire field swept by the wiper blade,
of the wiper blade contact pressure, originating in the wiper arm, against the
window. By means of a suitable curvature of the unstressed support element—that
is, when the wiper blade is not resting on the window—the ends of the wiper
strip, which in wiper blade operation presses completely against the window, are
stressed toward the window by the then-tensed support element, even if the radii
of curvature of spherically curved vehicle windows change at every position of
the wiper blade. The curvature of the wiper blade must accordingly be somewhat
greater than that in the swept field, at the most pronounced measured curvature
of the window to be wiped. The support element thus replaces the known, complicated
support bracket construction with two spring rails disposed in the wiper strip
and serving to reinforce the rubber-elastic wiper strip transversely (German Published,
Nonexamined Patent Application DE-OS 15 05 257).
In wiper systems with a wiper blade that is guided over the window transversely
to its length, a problem can arise which will now be explained in conjunction with
FIG. 1 of the drawing: In the wiping motion that takes place in pendulum-type wiper
system
10 (double arrow
12 between pendulum turning points
14),
a wiper blade
18 pivotably connected to a driven wiper arm
16 cleans
a wiping field
20 shaped like an annular segment, and the wiper arm
16
supported on one end swings like a pendulum, together with the wiper blade
18,
about an axis
22. The wiper blade
18 is pivotably connected to the
free end of the wiper arm
16 in such a way that the wiper blade can swing
about an axis
24 oriented approximately parallel to the window and can adapt
to the course of the window surface, which because of its shaping differs from
the plane in which the wiper arm swings. The wiping field boundary is defined by
the two pendulum turning points
14 and the wiper radii
26 and
28,
of which the outer, longer radius
28 is defined by the end
30 of
the wiper blade
18 remote from the pendulum axis, while the inner, shorter
radius
26 is defined by the end
32 of the wiper blade
18 near
the pendulum axis. A peculiarity of such wiper systems is considered to be that
the speed at which the wiper blade
18 sweeps over the window increases from
the inner radius
26 to the outer radius
28. Thus the forces of friction
decrease steadily from the shorter radius
26 to the longer radius
28,
as a function of the speed. The result is a moment acting on the known wiper blade
that loads the wiper blade, or seeks to rotate it, about a vertical axis
34
perpendicular to the window. The alternating stress (double arrow
36) resulting
as a function of the constantly changing pendulum direction (double arrow
12)
acts on the support point between the wiper arm
16 and the wiper blade
18,
which must therefore be designed as sufficiently stable. Vibrations caused by the
moment in the wiper arm and in the wiper blade—which causes the wiper blade
to exert a so-called "stick-slip" effect on the window—also worsen the outcome
of wiping.
To overcome this deficiency, in a known wiper blade (German Published, Nonexamined
Patent Application DE-OS 21 22 678), which for the sake of the most uniform possible
distribution of the force originating in the wiper arm for pressing the wiper strip
against the window is nevertheless provided with a multi-member support bracket
frame, on whose end remote from the drive shaft, or from the wiper arm hub that
can be connected to that shaft, of the support frame main bracket a leaf spring
is disposed, which is fixed by its one end to the main bracket. On the other, free
end of the leaf spring, which spring can be deflected in the direction of displacement
of the wiper blade, a small lead plate is mounted on each side of the spring leaf.
If during the wiping work the wiper blade begins to chatter—which essentially
leads to vibration in the plane of motion of the wiper blade—then the leaf
spring is also induced to vibrate. Because of the inertia of the small lead plates—given
a suitable adaptation of the leaf spring in terms of its length and thickness and
of the adapted magnitude of the weight of the small lead plates—the vibrations
of the leaf spring are in the opposite direction, with a time lag, from the vibrations
originating in the wiper blade and cancel the latter out.
SUMMARY OF THE INVENTION
To counteract chattering of the wiper blade of this generic type, it is embodied
in accordance with the definitive features of the present invention. As a result,
the structural height of the support element, which is low because of the support
element can be kept low. The length of the wiper blade also remains limited to
the minimum amount necessary for wiping.
If the mass body is embodied in striplike fashion and extends longitudinally
of
the support element, then depending on the applicable criteria it can be provided
with a suitable length, which is at maximum approximately equivalent to the length
of the wiper blade. In this way it is possible to adapt the available mass to requirements,
without requiring greater space for the wiper blade.
In a refinement of the invention, the support element has two spring rails, spaced
apart from one another and extending parallel to one another and disposed in the
same plane, and the wiper strip, over at least a part of its length, extends with
an extension through a gap between the two spring rails. At least one mass body
can be disposed in a simple way on the extension.
For many applications, in which the demand for a spoiler must be considered,
the mass body is advantageously embodied as a spoiler.
To vary the center of gravity of the mass body relative to the support element
and thus to vary its vibration frequency, it can be expedient if the mass body
has an at least approximately triangular cross section, or if the mass body, viewed
in cross section, is provided with a thickened portion on its free end remote from
the extension.
In a refinement of the concept of the invention, the spoiler comprises a different
material from the wiper strip that is fabricated jointly with it and solidly connected
to it. This makes it possible to choose a material that is especially suitable
both for the wiper strip and for meeting the demands made of the wiper strip, while
the desire for a mass body or the spoiler can be respected in a particular way.
In applications with especially stringent demands made of the wiper blade and
its spoiler, a multiple-material composite of these elements can be achieved by
providing that the wiper strip has a base body, which on a side remote from the
window changes over via the extension to the spoiler and furthermore, a striplike
wiper lip that can be placed against the window and that is made from a different
material jointly with the base body and is joined thereto via a rib strip is disposed
on the side of the base body toward the window.
A further feature of the invention provides that a spoiler embodied as an elongated
hollow body is formed onto the extension, and located in the cavity of the spoiler
is the mass body that is joined to the extension and is movable in the displacement
direction of the wiper blade.
In such embodiments of the wiper blade, it has proved especially advantageous
if viewed in cross section, the extension of the wiper strip changes over, at the
upper band side of the support element, into a bandlike base strip, with which
the wiper strip is connected via an articulated strip formed by longitudinal grooves
that are laterally open at the edges. The support element thus includes two spring
bands, located in the same plane extending approximately parallel to the window,
which rest in grooves assigned to them that are bounded at the top by the base
strip. The spacing between the inner edges, oriented toward one another, of the
spring bands makes it possible for the wiper strip to pass through support element.
The articulated strip makes the requisite mobility of the mass body in the displacement
direction of the wiper blade possible, and its dimensioning is oriented to the
requirements in terms of the requisite vibration frequency of the mass body.
If, viewed in cross section, the extension of the wiper strip changes over, at
the upper band side of the support element, into a bandlike base strip, with which
the hollow body, comprising a different material but fabricated jointly with the
wiper strip, is solidly connected via an articulated strip formed by longitudinal
grooves that are laterally open at the edges, then for the choice of material for
the hollow body, it is possible to a material that is especially advantageous for
it, yet is unsuited to meeting the demands made of the wiper strip.
Further advantages for the wiper blade of the invention can be attained if
the mass body comprises a different material from the wiper strip, the latter being
fabricated jointly with it and solidly joined to it.
As already noted, for a prescribed distribution of the contact pressure of the
wiper blade or the wiper arm, it is a basic prerequisite that the unstressed support
element is curved in the longitudinal direction, with the connection device for
the wiper arm located on the convex outer side of the support element and the wiper
strip disposed on the concave inner side of the support element.
Other advantageous refinements and features of the invention are disclosed
in the ensuing description of exemplary embodiments shown in the associated drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawing,
FIG. 1 is a basic illustration of a pendulum wiper system for windows of motor
vehicles, with a wiper blade pivotably connected to the wiper arm and showing the
field swept by the wiper blade;
FIG. 2 is a side view of a wiper blade of the invention;
FIG. 3 is a top view on the wiper blade of FIG. 2, with the wiper arm indicated
by dot-dash lines;
FIG. 4 is an enlarged sectional view through the wiper blade of FIG. 2, taken
along the line IV—IV;
FIG. 5 shows the arrangement of FIG. 4, with the terminal vibration positions
of a mass body disposed on the wiper blade shown in dot-dash lines;
FIG. 6 shows a different design of the mass body located on the wiper blade;
FIG. 7 shows the arrangement of FIG. 4, with a further design of the mass body
located on the wiper blade;
FIG. 8 shows the arrangement of FIG. 4 with a wiper strip made of two materials;
FIG. 9 shows the arrangement of FIG. 4 with a multiple-material wiper strip;
FIG. 10 shows the arrangement of FIG. 4, in which the mass body is accommodated
in a spoiler provided with a cavity;
FIG. 11 shows the arrangement of FIG. 10, with the terminal vibration positions
of the mass body of FIG. 10 shown in dot-dash lines;
FIG. 12 shows the arrangement of FIG. 10, in which the spoiler is made of a
different material from the wiper strip; and
FIG. 13 shows the arrangement of FIG. 12, in which the mass body is also made
of a different material from the wiper strip.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A wiper blade
40, shown in FIGS. 2 and 3, of a first embodiment of the
invention
has a bandlike-elongated, spring-elastic support element
42 with two spaced-apart,
parallel spring rails
41 extending in the same plane. In the middle portion
of the support element
42 (FIG. 4), on the top side
43 remote from
the window
54 to be wiped, a connection device
44 is disposed, with
the aid of which the wiper blade
40 can be connected releasably to a wiper
arm
48 (FIGS. 2 and 3) driven in pendulum fashion about a pendulum axis
45 and guided on the body of a motor vehicle. An elongated, rubber-elastic
wiper strip
46 is retained, longitudinally axially parallel, on the underside
49 of the support element
42, oriented toward the window
54.
As a counterpart connection means, a pivot bolt
50 belonging to the connection
device
44 of the wiper blade
40 is provided on the free end
47
of the wiper arm
48; it cooperates in the manner of a joint with a support
point that is present in the connection device
44. The wiper arm
48
and thus the wiper blade
40 as well are urged in the direction of the arrow
52 toward the window
43 to be wiped, whose surface to be wiped is
represented in FIG. 2 by the dot-dash line
54. Since the dot-dash line
54
is meant to represent the greatest curvature of the window surface, it is quite
clear that the longitudinal curvature of the still-unloaded wiper blade, resting
with its ends on the window, is greater than the maximum window curvature. That
is—unloaded—it has a concave course facing the window. On the convex
outer top side
43 of the support element
42, the connection device
44 is seated, while on the concave inner underside
49 of the support
element
42, the wiper strip
46 is disposed, with its wiper lip
56
that performs the wiping work. In response to the contact pressure (arrow
52),
the wiper blade
40, with its wiper lip
56, presses over its entire
length against the window surface
50 and changes over into a working position
that approximates the extended position. In this process a tension builds up in
the bandlike, spring-elastic support element
42, and this tension provides
for a proper contact between the wiper strip
46, or its wiper lip
56,
over its entire length with the motor vehicle window
54 and thus assures
a prescribed distribution of the contact pressure.
The particular features of the wiper blade
40 of the invention will now
be addressed in further detail. In a first embodiment (FIGS. 4 and 5), the wiper
blade
40 is provided with a striplike mass body
60, which extends
in the longitudinal direction of the support element
42. The mass body
60
is disposed in the region of the upper band face
43, remote from the window,
of the support element
42. In the exemplary embodiment, the support element
42 has two spaced-apart, parallel spring rails
41, extending in the
same plane, which rest in laterally peripherally open longitudinal grooves
62
of the wiper strip
46. The wiper strip
46 has a base body
64
of substantially square cross section, with the wiper lip
56 located on
its lower side, the side toward the window. The wiper lip
56 itself is connected
to the base body
64 via a narrow tilting rib
66. The base body
64
has the two longitudinal grooves
62, laterally open on the periphery, for
the spring rails
41 of the support element
42. The wiper strip, or
its base body
64, extends with an extension
68 through the gap between
the two spring rails
41, and this gap changes over, at the upper band face
43 of the support element
42, into a bandlike base strip
70.
On the top side, remote from the support element, of the base strip
70,
this strip changes over, because of the disposition of two laterally peripherally
open longitudinal grooves, into a narrow articulated strip
72, which likewise
extends longitudinally of the wiper blade
18. Thus the wiper strip
46
includes the base body
64, with its extension
68 and the base strip
70; the tilting rib
66; the wiper lip
56 that performs the
wiping work; the articulated strip
72; and the mass body
60. The
mass body
60 spaced apart from the base body
64, or from its base
strip
70, on the articulated strip
72, or else the mass body is integrally
joined to the base body
64 via the articulated strip
72. Since the
articulated strip
72 thus likewise comprises a rubber-elastic material,
the mass body
60 is disposed movably in the displacement direction of the
wiper blade (double arrow
74), so that it can oscillate over a certain angle
about the articulated strip
72. This oscillating motion is represented in
FIG. 5 by a double arrow
76. The mass body itself is represented in FIG.
5 in its two terminal vibration positions by dot-dash lines.
Now if during wiper operation—in which the wiper blade
18 is displaced
transversely to its length in the direction of the double arrow
74 (FIG.
4) over the window
54—and if for instance because of the aforementioned
circumstances the sliding motion of the wiper blade changes into a chattering motion,
then the mass body
60 is put into a vibrating motion (double arrow
76)
that is chronologically opposite the chattering motion, so that the chattering
vibrations are suppressed near their origin. This is true especially if the magnitude
of the mass of the mass body
60 and the dimensioning of the articulated
strip
72 are adapted to the criteria of the particular application of the
wiper blade. Hence the chattering vibrations cannot be propagated via the wiper
arm to the gear and to the drive motor of the wiper system, so that even these
drive components of the wiper system are not induced to vibrate and thus cause
noise. An especially advantageous feature of the invention is considered to be
that the mass body
60 is embodied as a spoiler. To that end, on its long
side that during wiper operation is oriented toward the primary air flow (arrow
78), the mass body has a hollow throat
80, which counteracts the
forces that seek to lift the wiper blade, especially at vehicle speeds. The length
of the mass body embodied as a spoiler depends on the particular vehicle-specific
conditions. It can be seen from FIGS. 2 and 3 that the mass body
60 has
two partial mass bodies
61, which are disposed one on each side of the connection
device
44.
The location of the center of gravity of the mass body relative to the longitudinal
axis of the center of gravity relative to the articulated strip
72 can also
contribute substantially to an effective elimination of the chattering vibrations.
Two examples of this are shown in FIGS. 6 and 7. Since the two exemplary embodiments
differ from the exemplary embodiment already described, shown in FIGS. 4 and 5,
only in terms of the cross-sectional shape, the reference numerals used for the
above exemplary embodiment are used here as well—where necessary. In the
compact cross-sectional shape of FIG. 6, the result is a center of gravity line
of the mass body
160, embodied as a spoiler, whose effective spacing
162
from the articulated strip
72 is relatively slight.
Conversely, the effective spacing
262 from the articulated strip
72 in the embodiment, also in the form of a spoiler, of FIG. 7 is relatively
great. This is due to the fact that in the exemplary embodiment of FIG. 7, the
mass body
260, viewed in cross section, is provided with an enlargement
264 on its free end remote from the extension
68.
In a departure from the exemplary embodiments described above, in which the wiper
strip
46 has three striplike regions integrally joined to one another—that
is, the base body
64, wiper lip
56, and mass body strip
60,
160 and
260—in the embodiment of FIG. 8 the mass body strip
360 of the wind strip
346 is made of a different material from the
base body strip
364 with its wiper lip
56. The connecting seam between
the base body strip
364 and the mass body strip
360 is identified
in FIG. 8 by reference numeral
362. In this embodiment as well, the mass
body strip
360 is embodied as a spoiler. Because of this particular design,
it is possible to optimize the choice of materials in such a way that the mass
body strip
360, for instance, is stiffer than the base body strip
364
with its wiper lip
56.
In the embodiment of FIG. 9 as well, the mass body strip
460 embodied
as
a spoiler is made from a different material from the base body strip
464.
The connecting seam is identified there by reference numeral
462. Furthermore,
the wiper lip
456 is likewise of a different material from the base body
strip
464. The connecting seam between the base body strip
464 and
the wiper lip
456 is identified in FIG. 9 by reference numeral
463.
Along with the advantage, already mentioned, of the stiffening of the mass body
strip
460 relative to the base body strip
464, for instance, it is
also possible in this embodiment for the wiper lip strip
456 to be further
optimized in terms of the choice of material, with a view to the results of wiping sought.
A common feature of the embodiments of FIGS. 10,
11 and FIGS. 12 and 13
is that a spoiler embodied as an elongated hollow body is formed onto the extension
68, or onto the base strip
70 adjoining the extension of the wiper
strip, or of the base body
64, in the cavity of which hollow body, the mass
body is located—protected against the oncoming flow of air—the mass
body being joined to the extension or to the base strip and being movable in the
displacement direction of the wiper blade. From FIG. 10 it can be seen that the
spoiler
500 embodied as a hollow body surrounds the striplike mass body
560 with spacing. The spoiler has two legs
502,
503, diverging
from an apex line
501, and the ends of the legs change over, near the support
element
42, to the base strip
570. In FIG. 11, the two terminal positions
of the vibrating motion of the mass body
560 are indicated by dot-dash lines.
In dimensioning the mass body, or the spoiler
500 embodied as a hollow body,
care must be taken to assure that the mass body strip
560 is not restricted
in terms of its freedom of motion by the legs
502,
503 of the spoiler
500. If the mass body strip were to strike the inner walls of the legs,
the result would be further uncontrollable vibrations in the wiper blade.
In the embodiment of FIG. 12, the spoiler
600 is made from a different
material from the wiper strip, with its base body strip
64, wiper lip strip
56, and mass body strip
560. The resultant connecting seams are identified
in FIG. 12 by reference numeral
605.
The embodiment of FIG. 13 is substantially equivalent to that of FIG. 12; once
again, the spoiler
700 is of a different material from the base body strip
64 with its wiper lip strip
56. However, in the embodiment of FIG.
13, the mass body strip
760 is formed of a different material from the base
body strip
64 and/or from the spoiler
700. The resultant connecting
seam is identified in FIG. 13 by reference numeral
707.
It is a common feature of all the embodiments proposed here for the invention
that they can be produced by the economical extrusion process. For the embodiments
of FIGS. 8 and 12, so-called dual-substance extrusion is attractive, while for
the embodiment of FIGS. 9 and 13, so-called multiple-substance extrusion is advantageous.
Another substantial common feature of all the described embodiments of the
invention is considered to be that in the region of the upper band face
43,
remote from the window, of the support element
42, the wiper blade
40
is provided with a mass body
60,
160,
260,
360,
460,
560,
660, or
760, which is disposed movably at least in the
displacement direction (double arrow
74) of the wiper blade.
*
