Windshield cleaning system, especially for motor vehicles

Details Windshield cleaning system, especially for motor vehicles Windshield cleaning system, especially for motor vehicles

1990-12-21

1993-03-23

Hornsby, Harvey C.

Brushing, scrubbing, and general cleaning

Attachments

Optical-member-attachable cleaner

2392841, 137580, 277 71, 285 98, 285275, B60S 146

Patent

active

051952068

DESCRIPTION:

BRIEF SUMMARY
INTRODUCTION

The invention relates to a windshield cleaning system, especially for motor vehicles.


BACKGROUND OF THE INVENTION

Windshield cleaning systems, in which the washing liquid is supplied to jets for the purpose of improving the effect of the washing system, which jets are arranged on the wiper arm-and-blade assembly and are moving to and fro with it, are already known. In a known embodiment of this kind the washing liquid is supplied through a pipe within a bore in a wiper shaft, whereby the end of the washing liquid pipe at the drive end of the wiper shaft axially engages into a pot-like connecting piece from which a tube stud for connecting a washing liquid supply tube is sticking out. In such a system the washing liquid pipe is moving to and fro like the wiper shaft, whereas the connecting piece is non-rotatably fixed because otherwise, the washing liquid supply tube would considerably be strained during operation of the cleaning system and there would be danger of tearing off after a longer time of operation. In an embodiment according to the DE-OS 36 43 476 or the DE-GM 81 00 709 the connecting piece is fixed onto a frame via an extension arm radially sticking out. In both cases not only a protection against twisting is realized by this extension arm, but also the connecting piece is rigidly fixed onto a stationary member.
Due to the necessary relative movement in such embodiments a seal between the end of the washing liquid pipe and the connecting piece is provided, which seal meets high requirements and still works reliably even after a longer time of operation. Because of fixing the connecting piece stable in form in a rigid manner this is not guaranteed in the known embodiments. Relatively big wear of the bearing surfaces between the end and the connecting piece is also disadvantageous.


BRIEF DESCRIPTION OF THE INVENTION

Thus the object of the present invention is to develop such a windshield cleaning system by using easy means in such a way that operation, especially perfect seal and bearing without play is guaranteed even after a longer time of operation.
One aspect of the invention is based on the idea that, when the connecting piece is resilently centered with respect to the end of the washing liquid pipe, the eccentric movement or the balance error of the wiper shaft, which cannot be excluded after some time of operation, does not negatively affect the seal between the connecting piece and the end because the connecting piece can also make this movement caused by balance error. Thus instead of fixing the connecting piece rigidly and in a way that is stable in form onto a stationary member as it is done in the known embodiments, according to the invention the connecting piece is flexibly mounted. The resilient centering can also be described in such a way that the connecting piece is held in a plane cross-wise to the axial direction of the shaft only by means of the end so that with respect to the stationary member only one security preventing the connecting piece from twisting is necessary. Thus in such an embodiment no radial forces are exerted onto the bearing point so that there is no danger of early wear.
According to another aspect of the invention, all these protections against twisting must be made in such a way that the connecting piece can radially freely be moved in each direction to a certain degree. So if for instance, the protection against twisting comprises a fork-like stud sticking out of the connecting piece, between the tines of which stud a stationary holding element engages, it should be possible to swivel this fork-like stud around the holding element to a certain extent. This can be achieved in a very simple way by forming this holding element as a round rod.
According to other aspects of the invention, different alternatives for resiliently pressing the connecting piece onto the end of the washing liquid pipe are described. In preferred embodiments the resilient element necessary for this purpose is fixed onto the stationary element which, as a part of t

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patent: 4313624 (1982-02-01), Zierden et al.
patent: 4439887 (1984-04-01), Fischer et al.
patent: 4893374 (1990-01-01), Bienert et al.

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