Drive unit for a wiper system of motor vehicles and method of manufacturing same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 1, 1992
Issued Date -
N/A
app pub date -
Feb 5, 1992
filing date -
Nov 17, 1987
priority date (Note) -
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status (Latency Note)
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Abstract
A connection and two step method of manufacturing is disclosed for a drive unit for a wiper arm system which consists of a wiper shaft mounted in a bore through a crank arm. The wiper shaft is formed with a groove disposed within the thickness of the crank arm and material from one surface of the crank arm is displaced to form an annular recess which causes crank arm material adjacent the groove to be radially displaced into a groove formed in the wiper shaft to form an axial holding element. The radial distance R1 of the recess from the crank arm bore is substantially equal to the axial distance A1 of the groove below the one crank arm surface to facilitate the extruding process. Knurled areas on the shaft on either side of the groove are press fit into the crank arm bore as a first step in assembling the shaft to the crank arm, bringing a flange into abutment against the other surface of the crank arm.
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