Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1989-06-08
1990-12-25
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525023, B60S 126
Patent
active
049792598
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a windshield wiper system according to the features of the preamble of claim 1.
A windshield wiper system of this kind is known from the DE-OS No. 33 24 634. The wiper arm-and-blade assembly of a windshield wiper system of this kind is, if required, several times retracted and extracted in the radial direction during its swivelling motion, so that also the corner areas of the windshield are cleaned. The radial displacement of the wiper arm-and-blade assembly or of the piston connected with the form and displaceably mounted in a guide housing moving in pendulum fashion is in the known embodiment derived from the rotation of a shaft supported on the guide housing, which shaft carries a pinion outside the guide housing, which pinion meshes with a stationarily arranged toothed segment. The guide housing itself is driven via a shaft which is movable guided in a bearing bush of a supporting frame. Looking in the direction of displacement of the piston the drive shaft acts upon the guide housing approximately in the center of the latter. If a windshield wiper system is fitted in a motor vehicle in such a way that the drive shaft is arranged closely to the lower rim of the windshield, the front housing portion moves in front of the pane, whereas the rear housing portion moves in pendulum fashion in the engine compartment. It is thereby of advantage that only about half of the guide housing is positioned in front of the pane to be cleaned and, as a matter of fact, the view through the windshield is only impeded in exceptional cases. It is however a disadvantage that the other half of the housing dips relatively deep into the engine compartment, so that sufficient space has to be created there. However this space is not available in all vehicle models.
The guide housing of the known embodiment is constructed to be substantially symmetrical to the direction of displacement of the piston, which thus is displaceably guided in the center of the said guide housing and intersects the axis of rotation of the guide housing. The wiper arm-and-blade assembly is centrically fixed to the free end of the piston, with the wiper blade adjusted extactly in the longitudinal direction of the piston. The wiper blade ends at a spacing from the free end of the piston, so that between the axis of rotation of the guide housing and the adjacent end of the wiper blade there is left a relatively large area which is not wiped. This substantially symmetrical shape of the guide housing and the wiper arm-and-blade assembly can for some vehicles mean that the wiper blade projects relatively far into the windshield to be cleaned even in its parking position which fact is not accepted by some vehicle manufacturers predominantly on grounds of style.
On the whole it has to be stated that the known version cannot be used for all vehicle models.
Thus the object of the invention is to develop a windshield wiper system of this kind in such a way that it can also be used when there is only little space available for mounting purposes in the engine compartment. The wiping area is of course expected to meet the present standard or is even to be enlarged, if possible.
This problem is solved according to the invention with the characterizing features of claim 1.
The present invention is thereby based on the idea of being able to make the volume of the guide housing rear portion considerably smaller, when the shaft from which the direction of displacement of the piston is derived is arranged between the axis of rotation of the guide housing and the front end of the guide housing. Normally this measure makes the front portion of the housing larger, however its rear portion is so much diminished that it can be fitted in a motor vehicle even if there are narrow space conditions.
It is true that a wiper system has been known from the DE-AS No. 1 066 890 in which the windshield wiper is also radially retracted and extracted during the swivelling motion with the radial direction of displacement being derived from the rotation of a shaft whi
REFERENCES:
patent: 4625359 (1986-12-01), Egner-Walter et al.
patent: 4648148 (1987-03-01), Egner-Walter et al.
patent: 4698873 (1987-10-01), Aoki et al.
Egner-Walter Bruno
Schmid Eckhardt
Scholl Wolfgang
Hornsby Harvey C.
Machuga Joseph S.
Seitter Robert P.
SWF Auto-Electric GmbH
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