Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Reexamination Certificate
1999-10-19
2001-12-11
Graham, Gary K. (Department: 1744)
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
Reexamination Certificate
active
06327739
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a wiper device. In a known wiper device of this type (DE- AS 19 05 352), the connecting device for the wiper blade is made of a sheet metal piece and provided with a plug-in bushing, into which the solid, prefabricated connecting rod must be inserted and fastened in a further process step. Besides the thickening expense needed for this, it is furthermore disadvantageous that this plug-in connection between the connecting device and the connecting rod unnecessarily increases the mass which needs to be accelerated and braked during the wiping process, something which needs to be taken into consideration by an appropriate layout of the drive components for the wiper device.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a wiper device which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, in the present invention the wiper arm connecting rod and the connecting device for the wiper blade are produced in one piece from a sheet metal plate which is folded in two layers in a region of the connecting rod.
With the wiper device in accordance with the invention, the connecting device for the wiper arm and the connecting rod can be produced in a single process step. The arrangement of a plug-in bushing is omitted. A weight reduction is the result of this—also in view of the omission of a solid connecting rod—which has space-saving and cost-effective results in the layout of the drive components.
With another known wiper device (DE 34 20 274 A1), the first hinge element of the tilt hinge is U-shaped in cross section and made of a sheet metal piece and is riveted in the area of an overlapping section between the hinge element and the solid prefabricated connecting rod to the latter. The production outlay required for this is considerable. Moreover, the overlapping section increases the mass which must be accelerated and braked in the course of the wiping action, which makes the layout of the drive components more expensive.
In accordance with another embodiment of the present invention, the wiper arm connecting rod and the first hinge element of the tilt hinge are produced in one piece from a sheet metal plate which is folded in two layers in a region of the connecting rod.
With the wiper device in accordance with this embodiment of the invention, the connecting rod of the wiper and the first hinge element of the tilt hinge can be produced in a cost-effective manner in a single production step. Special fastening means and an overlapping section can be omitted. The weight savings resulting from this and from the omission of a solid connecting rod allow a cost-effective layout of the drive components of the wiper device.
A particularly advanced further embodiment of the invention results if the wiper arm connecting rod, the connecting device for the wiper blade and the first hinge element of the tilt hinge are made from sheet metal in one piece, because in this case the advantages of the above mentioned individual steps are complemented in a logical manner.
To increase the stability of the wiper arm in the area of the wiper arm connecting rod, the latter is stiffened by deformations of the sheet metal. By means of these deformations it is possible to multiply the wiper stage and the bending moments over the entire wiper arm range.
Further advantageous developments and embodiments of the invention are recited in the following description and in the exemplary embodiments represented in the associated drawings.
REFERENCES:
patent: 1362175 (1920-12-01), Oishei
patent: 4133071 (1979-01-01), Jaske
patent: 5724699 (1998-03-01), Bexten
patent: 1 905 352 (1973-07-01), None
patent: 34 20 274 A1 (1985-01-01), None
patent: 4142163 (1992-07-01), None
patent: 1012968 (1952-07-01), None
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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