Joints and connections – Member deformed in situ – Deformation occurs simultaneously with action of separate,...
Reexamination Certificate
1999-08-09
2001-03-06
Browne, Lynne H. (Department: 3629)
Joints and connections
Member deformed in situ
Deformation occurs simultaneously with action of separate,...
C403S274000, C015S250300, C015S250310
Reexamination Certificate
active
06196754
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is directed to a drive device for a wiper installation, in particular for windows of motor vehicles.
Drive devices of the generic type are known. They have a holding element, generally constructed as a hollow rod, which carries, at its free ends, bearings for receiving a wiper shaft. The bearings are normally produced as diecast parts or as plastic injection-molded parts. In order to connect the bearings with the holding element in a positive and frictional engagement, it is known to construct the bearings with a connection piece which engages in the holding element constructed as a hollow rod. Subsequently, the holding element which is generally a shaped sheet metal part is acted upon by a joining force which results in a plastic deformation of the holding element in some areas. In order to achieve a frictional and positive engagement, the connection piece of the bearing has recesses in the area of the plastic deformation of the holding element, wherein the material of the holding element can be forced into these recesses. It is disadvantageous in the known drive devices that this frictional and positive engagement between the bearing, which is constructed in particular as a plastic part, and the holding element cannot be produced with sufficient security because, due to the modulus of elasticity of the plastic, this plastic tends to flow during the pressing of the joining connection between the bearing and the holding element.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an actuating device which avoids the disadvantages of the prior art.
In keeping with these objects, one feature of present invention resides, briefly stated, in a drive device for a wiper installation, in which the bearing has a connection piece engaged by a bushing, the holding element engages in an annular space between the connection piece and the bushing and is partially plastically deformable inside the annular space, a positive engagement is provided between the holding element and the connection piece and a frictional engagement is provided between the holding element and the connection piece and between the holding element and the bushing.
In contrast to the prior art, the drive device according to the invention offers the advantage that a secure positive and frictional engagement is produced between the bearing and holding element in a simple manner. As an advantageous result of the fact that the bearing has a connection piece engaged by a bushing, wherein the holding element engages in an annular space formed between the connection piece and the bushing, the holding element is plastically deformable inside the annular space, and a positive engagement exists between the holding element and the connection piece and a frictional engagement exists between the holding element and the connection piece and between the holding element and the bushing, it is achieved that the holding element is essentially clamped in the annular space between the connection piece and the holding element of the bearing due to its plastic deformation. Therefore, added axial and/or radial force acting on the joining connection can be intercepted via the frictional engagement between the bushing and the holding element, so that the bearing is reliably fastened to the holding element. In particular, it is possible to compensate for manufacturing tolerances in a simple manner by the clamping of the holding element between the connection piece and the bushing. Manufacturing tolerances of the bearing, especially its connection piece which can be inserted into the holding element, as well as manufacturing tolerances of the holding element itself, can be compensated by the clamping in the annular space of the bearing between the connection piece and the bushing.
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Boos Tino
Bruemmer Dietmar
Mayer Juergen
Browne Lynne H.
Malcolm Tomlyne A.
Robert & Bosch GmbH
Striker Michael J.
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