Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1990-10-09
1993-08-03
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525036, 1525031, B60S 140, B60S 138
Patent
active
052317307
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a wiper blade for wiper systems.
BACKGROUND OF THE INVENTION
Normally a wiper blade of a modern motor vehicle consists of a carrier yoke system with a primary yoke and several clawed yokes, of a rubber wiper strip as well as of reinforcing or resilient rails by way of which the pressure exerted only punctually onto the wiper strip via the claws of the carrier yoke system is distributed over the whole wiper strip as evenly as possible. Thereby the wiper strip has a carrier body comprising a first elongated groove each on both sides, in which elongated grooves these reinforcing rails are located in a depressed way. Furthermore the carrier body of the wiper strip has another elongated groove or an elongated channel each on both sides, into which the ends of the claws of the clawed yokes engage. Wiper blades of such a construction are also especially suitable for cleaning bent windshields of motor vehicles because due to the yoke system and to the movable guiding of the claws in the elongated channel the contour of the wiper lip can be adapted to the windshield to be cleaned, for these claws can be moved in the elongated channel and it has also been taken care that a relative movement is possible between the reinforcing rail and the wiper strip.
Wiper blades of this sort are known, in which the elongated groove for the resilient rail is running to the transverse face of the wiper strip only on one side, whereas on the other side this elongated groove is terminated by a cross web. At a distance of this cross web a securing cam is provided in the elongated groove, which securing cam cooperates with a recess in the reinforcing rail and serves as a securing means against a longitudinal movement of this reinforcing rail in relation to the wiper strip. Thus in this embodiment the reinforcing rail is form-fittingly connected with the wiper strip next to its one end. If such a wiper blade is moved over a bent windshield, the reinforcing rails and the wiper strip are bent respectively, whereby there must be a relative movement between the reinforcing rail and the wiper strip. Due to fixing the reinforcing rail stationarily at the one end more and more of these relative movements inevitably occur at the other end. This also occurs, when unavoidably the wiper strip shrinks because of variations in temperature. Due to fixing the reinforcing rail stationarily at the one end a relatively big relative movement is necessary at the other end. This causes problems especially in case of high wiping speed because the wiper strip is not deformed and adapted quickly enough to the windshield to be cleaned so that the wiping effect is decreased.
Correspondingly these explanations also apply to the way the wiper strip is fixed to the carrier yoke system. As to the known wiper blades the carrier yoke system is fixed at the same end of the wiper strip as the resilient rail and the claw at the other end of the carrier yoke system is relatively moved a lot in relation to the wiper strip, if this wiper strip is moved over a bent windshield.
SUMMARY OF THE INVENTION
The object of the present invention is to improve a wiper blade of this kind with respect to its wiping effect without causing higher manufacturing costs.
Thereby the basic idea of the invention is that by displacing the securing means preventing the resilient rail from moving in longitudinal direction in the elongated groove, from the edge to the centre of the wiper strip the necessary compensating movements between the resilient rail and the wiper strip are evenly distributed over both ends.
Considering that in the known embodiment only one end of the reinforcing rail is moved in relation to the wiper strip, whereby, however, it has to travel a relatively long way, in the embodiment according to the invention both ends of the resilient rail can be moved in relation to the wiper strip, whereby only half of the moving way is measured. This is achieved by fixing the resilient rail stationarily in the central area of the wiper
REFERENCES:
patent: 2983945 (1961-05-01), De Pew
patent: 3097734 (1963-06-01), Hoyler
patent: 3696497 (1972-10-01), Quinlan
patent: 3902216 (1975-09-01), Stratton
patent: 4389747 (1983-06-01), Riester
patent: 4543682 (1985-10-01), Kessler et al.
Schmid Eckhardt
Scholl Wolfgang
Graham Gary K.
Hornsby Harvey C.
Lewis J. Gordon
Seitter Robert P.
SWF Auto-Electric GmbH
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