Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1986-10-30
1988-04-12
Feldman, Peter
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525016, 1525035, B60S 132
Patent
active
047364858
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a windshield wiper system according to the features of the preamble of claim 1.
In the usual windshield wiper systems the contact pressure, with which the wiper lip of a windshield wiper is pressed against the window pane to be cleaned, is produced by a tension spring, which is prestressed between the fastening member and the link of the wiper arm. Thus the contact pressure must be relatively great, so that the wiper blade is not lifted from the window pane even at high driving speed. However with a great contact pressure the wiper lip is constantly deformed in the parking position. This has an disadvantageous effect on the wiping performance.
Several solutions are known to cure this shortcoming. In one construction the suspension point of the tension spring is varied in the parking position and thus the contact pressure produced by this spring is reduced. In another solution, which is for example known from the German specification OS No. 1 680 194 the wiper arm hits an approach incline in the parking position, so that the wiper lip is relieved. Such an approach incline causes disturbing noises in particular, when the windshield wiper runs onto this approach incline in each wiping cycle. This disadvantage is cured in another embodiment of this printed specification in which in the parking position a tappet swivels the wiper against the force of the tension spring. During normal wiper operation this tappet is retracted by the force of a then excited electromagnet, however it is pressed towards the wiper arm by a spring when the wiper motor is switched off and the electromagnet is de-energized at the same time. In such a construction damages in the lacquer layer of the wiper arm and noises cannot be prevented, because the tappet abruptly hits the wiper arm. Finally a construction is known from the Austrian pat. No. 252 748 in which, for the production of the necessary contact pressure, a magnet arranged on the wiper arm co-operates with a segment-shaped armature, wherein the arc length of the armature is smaller than the wiping angle. Thus during the normal wiping angle the contact pressure is supported magnetically, whereby the contact pressure is favourably reduced in the reversing positions, however only to a value predetermined by the still effective tension spring. Thus a sufficient relief of the wiper lip can thereby not be achieved.
The present invention is based on the problem of creating a windshield wiper system in which a sufficient relief of the wiper lip in the parking position is provided.
This problem is solved according to the invention with the characterizing features of claim 1.
The invention is thereby based on the idea that with a transmission of the magnet force to the windshield wiper without contact disturbing noises cannot appear. Furthermore a damaging of the lacquer layer is prevented. Thus the basic idea of the present invention can also be realized when the windshield wiper system does not have a so-called concealed parking position and the windshield wipers are rather deposited in one of their reversing positions. Of course the invention is also applicable, when in the parking position the windshield wipers are deposited outside the normal wiping area.
Thus the principal feature of the present invention is to be seen in that in the parking position the magnet produces a force, which reacts opposite to the contact pressure produced by the tension spring. Thus in this point the present invention differs essentially from the prior art mentioned. In the construction according to the German specification OS No. 1 680 194 the magnet force is indeed effective in the same direction as the force of the tension spring. In the construction according to the Austrian pat. No. 252 748 the magnet is not at all effective in the parking position.
The basic idea of the present invention can be realized in various ways. In a first alternative the magnet co-operates with magnetizable, ferromagnetic parts. Thereby either a body member, e.g. the hood consisting of sheet meta
Egner-Walter Bruno
Schmid Eckhardt
Feldman Peter
Raden James B.
Seitter Robert P.
SWF Auto-Electric GmbH
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