Wiper and washing system, especially for window panes of motor v

Details Wiper and washing system, especially for window panes of motor v Wiper and washing system, especially for window panes of motor v

1993-01-22

1995-01-24

Scherbel, David A.

Fluid sprinkling, spraying, and diffusing

Liquid sprayer for transparent panel

239450, 239600, 1525004, 1525001, 285 28, 2851371, B60S 152, B60S 146

Patent

active

053836022

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND

The invention relates to a wiper and washing system especially used for window panes of motor vehicles.
Wiper and washing systems are already known in which a nozzle head with several washing nozzles is seated at the end of a wiper arm, on which the wiper blade is swivelably mounted. The nozzle head has two pipe unions, whereby at least one washing nozzle is connected to the one pipe union and at least one other washing nozzle is connected to the other pipe union. Thus the different washing nozzles can be supplied with washing liquid independently of each other and especially when the wiper arm moves forth and back, washing liquid can be sprayed before the wiper blade. The nozzle head can be supplied with washing liquid via a tube which comprises two separate channels, is put along the wiper arm and starts off from a connecting piece located in the drive end of the wiper arm. In order to be able to provide the washing nozzles with washing liquid in the desired manner, it is necessary to connect the tube both to the connecting piece and to the nozzle head properly. Mixing up the channels might lead to the fact that washing liquid is not sprayed before, but behind the wiper blade.


SUMMARY OF THE INVENTION

The object of the invention is to develop a wiper and washing system in such a way that a proper connection of the tube to the nozzle head and to the connecting piece is highly ensured.
This object is achieved according to the invention by providing the tube on the one hand and the nozzle head and the connecting piece on the other hand, with means for coding the connections between tube and nozzle head as well as between tube and connecting piece.
Thus an embodiment is preferred, in which the forms of the coding means for making the tube engage into or lie on the nozzle head or the connecting piece are adapted to each other. By such a coding it is difficult to incorrectly put the tube onto the nozzle head or onto the connecting piece.
It is possible to form the front face of the tube and respective means on the connecting piece or on the nozzle head in such a way that the tube, when taking it in the wrong way, cannot completely be pushed onto the pipe unions. For example, the front face of the tube could be inclined with respect to its longitudinal direction and on the connecting piece or nozzle head there could be a correspondingly inclined contact area for this front face. The front face could especially be inclined in such a way that the one channel of the tube is longer than the other, whereby the pipe unions, too would have to be displaced in longitudinal direction. However, a solution in which the cross-section of the tube has an outer contour which is without symmetry, especially without double-counting symmetry, seems to be more favorable. In this case the means on the connecting piece or on the nozzle head can easily be formed in such a way that when starting to put the tube onto the connecting piece or onto the nozzle head one realizes that it has been assembled in the wrong way.
Preferably the symmetry is disturbed by a groove running in longitudinal direction of the tube. Especially there is not only a groove at the ends of the tube, but it extends along the whole tube. With respect to the position of the groove the area of a separating web between the two channels of the tube is preferred because there such a groove can be provided without weakening the channel walls.
Of course, the tube can also lead to a nozzle head fixed onto the car body of the motor vehicle. If, however, the tube is put along a wiper arm, it is of an advantage, if the side of the tube on which the groove is located, faces the wiper arm so that the groove cannot be seen.
On the connecting piece or on the nozzle head the coding means are preferably formed by a lug extending along pipe unions on the connecting piece or on the nozzle head. If the tube is provided with a groove, the lug engages into this groove.
Normally pipe unions for tubes comprise a section in which they expand like a cone at the outside and

REFERENCES:
patent: 2798745 (1957-07-01), Nelson
patent: 3418676 (1968-12-01), Byczkowski et al.
patent: 3427675 (1969-02-01), Tibbet
patent: 3539106 (1970-11-01), Ramik
patent: 4103936 (1978-08-01), Sutcliffe et al.
patent: 4920602 (1990-05-01), Kuehbauch

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