Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Reexamination Certificate
1999-02-25
2001-05-08
Graham, Gary K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
C015S250430
Reexamination Certificate
active
06226829
ABSTRACT:
BACKGROUND OF THE INVENTION
With wiper blades of this type, the support element is intended to assure the most even distribution of the contact pressure on the window issuing from the wiper arm for the entire wiped field swept by the wiper blade. By means of an appropriate curvature of the unloaded support element—i.e. when the wiper blade does not rest against the window—the ends of the wiping strip, which are completely placed against the window when the wiper blade is operated, are then stressed in the direction toward the window, even if the radii of curvature of spherically curved vehicle windows change with every wiper blade position. The curvature of the wiper blade therefore must be slightly greater than the greatest curvature measured in the wiping field of the window to be wiped. Thus, the support element replaces the expensive support bow construction with two spring rails arranged in the wiping strip, such as is used in conventional wiper blades.
With a known wiper blade of this type (DE-OS 23 44 876), the support element, which is made of plastic and is therefore comparatively thick, is provided with lateral pivot pins, whose common pivot axis lies closer to the window than the strip surface of the support element facing away from the window. This pivot axis is intended to make possible a relative movement between the wiper arm and the wiper blade, which in all operating positions is required for matching the wiping strip to the course of the window, which is overwhelmingly spherically curved, but does not correspond to a section of the surface of a sphere. The thickness of the support element, which is required for reasons of the desired even distribution of the contact pressure, results in a large structural height, which is undesirable because of the air flow conditions present in front of the vehicle window, since the wiping quality is diminished by it, in particular at high driving speeds.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a wiper blade for windows of motor vehicles, which eliminates the disadvantages of the prior art.
In keeping with these objects, one feature of present invention resides, briefly stated, in a wiper blade, in which the support element is made of metal, and the distance of a plane of displacement of the pivotaxis of the wiper blade from the surface of the window to be wiped is at most as a great as the distance between this surface and a strip surface of the support element facing away from the window.
When using a support element made of a metal for the wiper blade in accordance with the invention, its thickness can be considerably reduced. Moreover, because of the arrangement in accordance with the invention of the pivot axis in relation to the strip surface of the support element facing away from the window, the guidance of the wiper blade on the window is improved, because tilting forces based on the friction between the wiping strip and the window and acting on the wiper blade are reduced by means of the shortening of the lever arm which is effective in this respect. In this case the support element can also be made in several parts and can have two or more parallel sheet metal strips, for example.
An embodiment of the pivot axis which is easy in actual use results, if the pivot axis is constituted by the common longitudinal axis of two pins, which are arranged opposite each other on the support element and project past its longitudinal edges.
A cost-effective arrangement of the pins on the metallic support element is achieved if they are arranged on a separate component, which is a part of the support element and is fixedly connected with the support element.
The requirement for the lowest possible structural height of the wiper blade is met in a particularly advantageous manner if, in a further development of the invention, the component is designed to be U-shaped in cross section, if the base of its U rests with its inside against the strip surface of the support element facing away from the window, wherein the legs of the U respectively extend around a longitudinal edge of the support element, and if finally a pin is arranged on the exteriors of each U-shaped leg which face away from each other. Such a structure also leads to a cost-effective and permanent connection between the support element and the component.
The component can be produced simply and cost-effectively from a plastic material, wherein the pins have been formed on it in one piece.
A bearing receptacle provided on the wiper arm is assigned to each one of the two pins for providing the required pivot seating.
Further advantageous developments and embodiments of the invention are recited in the following description of an exemplary embodiment represented in the associated drawings.
REFERENCES:
patent: 1573618 (1926-02-01), Laganke
patent: 2056777 (1936-10-01), Evans
patent: 2276556 (1942-03-01), Zaiger
patent: 3132367 (1964-05-01), Wise
patent: 3192551 (1965-07-01), Appel
patent: 3838475 (1974-10-01), Quinlan et al.
patent: 3872537 (1975-03-01), Bianchi
patent: 4120069 (1978-10-01), Sharp et al.
patent: 966610 (1975-04-01), None
patent: 2 344 876 (1974-03-01), None
patent: 1416851 (1965-09-01), None
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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