Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Reexamination Certificate
1999-02-25
2001-08-28
Graham, Gary K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
C015S250430, C015S250320, C015S250451
Reexamination Certificate
active
06279191
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a wiper blade for cleaning vehicle windows.
In wiper blades the support element is intended to assure the most uniform possible distribution of the wiper blade contact pressure, originating in the wiper arm, on the window over the entire field swept by the wiper blade.
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 placed completely against the window while the wiper blade is in operation are stressed by the support element, which is then tensed toward the window even if the radii of curvature of spherically curved vehicle windows change for every wiper blade position. The curvature of the wiper blade must accordingly be somewhat greater than the greatest curvature measured in the wiping field of the window to be wiped. The support element thus replaces the complicated support bracket construction with two spring rails disposed in the wiper strip, of the kind employed in conventional wiper blades (German Published, Non-Examined Patent Application DE-OS 15 05 397).
In a known wiper blade of this type (German Patent 10 28 896), the two spring rails, designated as longitudinal springs and belonging to the support element, are secured by one-piece spring clamps in the longitudinal grooves, designated as slits, in the rubber wiper strip. The clamps must be thrust onto the longitudinal springs in the longitudinal direction of the wiper blade, embracing the outer edges of the springs with claws. A rib connecting the claws must be curved to suit the thickness of the spine of the wiper strip, which leads to unfavorable assembly conditions. A middle clamp, disposed in the region of the connection device, must in fact cross this device in an aperture, which entails considerable expense for assembly, since at least one of the two claws cannot be formed until after that.
SUMMARY OF THE INVENTION
In accordance with the present invention in a wiper blade a holder is divided in a longitudinal direction of the wiper blade into holder parts, and the holder parts are joined together.
In the wiper blade of the invention, it is possible for the finished holder parts to be brought to the wiper blade crosswise to the longitudinal length of the support element and thus also of the wiper blade and then joined together. This kind of assembly is especially economical, because it can be performed as needed by assembly robots.
To improve the wiping performance and quality, a plurality of holders are expediently distributed over the longitudinal length of the support element and spaced apart from one another.
With relatively short wiper blades, it can suffice for that purpose to dispose one holder on each end portion of the elongated support element.
If the connection device is provided with fastening means that engage the two spring rails; and the connection device is divided in the longitudinal direction of the support element; and the device parts are joined together in their final assembled position, then efficient assembly on the support element for the connection device is obtained as well.
The design of a wiper blade that is highly effective, even at high vehicle speeds, is especially advantageous if the region of the wiper strip located on the band face remote from the window is embodied as a wind deflector strip extending essentially away from the window, and each holder is assigned one recess in the wind deflector strip.
With regard to the structural height of the wiper blade, it may be favorable if the connection device is assigned a recess in the wind deflector strip. Along with simple assembly, reliable securing of the spring rails in the longitudinal grooves of the wiper strip is attained if the holder parts, in clamplike fashion, grip an exposed portion of the outer edges of the spring rails.
This embodiment is advantageous, with the same advantages, for the disposition of the connection device as well. Moreover, the installed connection device can contribute to seating the spring rails, as prescribed, in their middle portion in the longitudinal grooves.
An especially simple, stable and easily installed connection device is obtained if the connection device has two device parts, and each device part has a flangelike protrusion, extending into the longitudinal direction of the support element and standing upright on the window and extending away from it, on which protrusion connection means for the wiper arm are seated.
Further simplifications in assembly both for the holders and for the connection device are obtained if the holder parts and/or the connection devices can be interlocked with one another.
REFERENCES:
patent: 3093856 (1963-06-01), Smithers
patent: 3116507 (1964-01-01), Scinta
patent: 3192551 (1965-07-01), Appel
patent: 3390416 (1968-07-01), Scinta
patent: 3408678 (1968-11-01), Linker
patent: 3430285 (1969-03-01), Rickett
patent: 4348782 (1982-09-01), Fournier
patent: 1028896 (1958-04-01), None
patent: 1 505 397 (1969-10-01), None
patent: 316114 (1989-05-01), None
patent: 1239780 (1960-07-01), None
patent: 2222855 (1974-10-01), None
patent: 2222853 (1974-10-01), None
Kotlarski Thomas
Lorenz Karlheinz
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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