Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1990-12-20
1992-12-29
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
2392841, 239264, 285921, B60S 146
Patent
active
051739860
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a windshield cleaning system, in particular for motor vehicles.
BACKGROUND OF THE INVENTION
Modern motor vehicles have a windshield cleaning system which in addition to a windshield wiper system also includes a windshield washer system, via which washer system washing liquid is sprayed onto the window pane to be cleaned. Recently constructions have been successful in which the washing liquid is supplied from a bore in the wiper shaft to a nozzle above the wiper arm. A system of this kind is known from the German patent 3 523 441. In this construction a pipe for forming a washing liquid channel is put into the through-going bore of the wiper shaft. A pipe union is integrally formed onto one end of the pipe. A nozzle body is locked with the pipe at its other end projecting over the wiper shaft. The nozzle body has a locking recess cooperating with a crowned locking body formed onto the outer surface of the pipe. A construction of this kind has proven worthwhile in practice. However it has to be stated that a demounting of the nozzle body during a possibly necessary repair is very difficult, if the locking device is constructed in such way, that a satisfactory sealing is achieved in this passage between pipe and nozzle body even after a longer service time. If, however, dimensions and materials for the locking body and for the locking recess on the nozzle body are selected, which enable a locking without exerting a great amount of force, it has to be feared, that washing liquid flows out in this place, in particular if the supply pressure is increased. It is furthermore a disadvantage of the known construction that the pipe cannot be exchanged without difficulty, if a rear window wiper system is concerned in which the wiper shaft is directly integrated into the gear housing of the drive motor.
BRIEF DESCRIPTION OF THE INVENTION
The present invention is therefore based on the problem of developing a windshield cleaning system of the initially mentioned kind in such a way that the piece parts forming a washing liquid channel in a through-going bore of the wiper shaft can be easily mounted and can be exchanged when damaged, but in case of increased supply pressures a reliable sealing is nevertheless ensured, even after a long service time.
The invention is based on the idea of meeting the requirements much better than in the known construction by separating locking and sealing functions. In the known construction on the one hand the nozzle body is to be held by the locking body as well as by the locking recess and on the other hand a sealing between pipe and nozzle body has also to be achieved.
In a preferred embodiment--in addition to the locking body--a sealing bead is therefore provided to form a sealing means on the nozzle body, which sealing bead rests against the pipe with press fit.
A particularly reliable connection between nozzle body and pipe is achieved by a development, where the nozzle with its pipe-shaped stud projects into the pipe end, and thus is not slipped over the free end of the pipe as in the known construction. In contrast to the known construction the crowned locking body is arranged on the pipe-shaped stud, whereas the locking recess cooperating with the locking body is formed on the inner wall of the pipe. Between the locking body and the free end of the pipe-shaped stud the sealing bead is provided with a spacing from the locking body, which sealing bead rests against the inner pipe wall with press fit. By moving the locking device into an area within the pipe it is indeed achieved that the nozzle body is so-to-speak fixed in the area of the bore of the wiper shaft. This means on the other hand that the pipe wall can be selected relatively thin, because a giving way of the pipe normally made form plastic material is prevented by the wall at the rim of the wiper shaft bore. Only for regularity's sake it is emphasized that a fixation of a nozzle body within the bore of a wiper shaft is known in itself from the U.S. Pat. No. 2,609,561. There the nozzle body
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Bohmer Rainer
Reinhardt Hans-Peter
Walther Bernd
Graham Gary K.
Hornsby Harvey C.
Lewis J. Gordon
Seitter Robert P.
SWF Auto-Electric
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