Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1989-05-11
1990-08-14
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
B60S 132
Patent
active
049475088
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
This invention relates to a windshield wiper arm which may be pivoted between a windshield engaging wiping position and a position in which the arm is titled away from the windshield, as for replacement of the wiper blade, and retained in either position by a spring whose line of action passes over center of the pivot axis during movement between the two positions.
Nowadays motor vehicles are sometimes constructed in such a way that a windshield wiper has to be fixed in a narrow slot positioned between the windshield and the hood or the trunk lid, because the windshield wiper is not to be seen in the parking position and is to occupy a so-called concealed parking position.
In order to be able to exchange the wiper blade of a windshield wiper without any problems it is desired that the link of the wiper arm, mostly holding a wiper blade through a wiper rod, may be titled from the window pane into a stable position, in which the front end of the wiper arm is as far away from the window pane as possible. The stable titled position can be achieved by so far swivelling the link with the spring element and, if required, the yoke relative to the fastening member about the swivelling axis between fastening member and link which is normally realized by a rivet pin formed as a bearing pin guided in a tube-shaped receiver formed by a bearing bush surrounded by fastening member material which normally is a casted material, so that the line of application of the spring element as is known extending between the two points of articulation crosses the swivelling axis between link and fastening member until the spring element has passed the dead center line relative to the swivelling axis which former as is known intersects the line through the center of the swivelling axis and the spring element or the yoke hits the area of the fastening member guiding the swivelling axis or until the link hits the upper side of the fastening member. A wiper arm of this kind is for example known from the German patent 2 105 101. Here a tension spring is on the one hand nested in an area of a wiper rod riveted with the link, wherein this area is positioned in front of the swivelling axis and the link and on the other hand in an area farther to the rear but still in front of the swivelling axis on an approximately C-shaped, downwardly curved yoke which is articulated on a holding pin arranged on the fastening member. This point of articulation is arranged behind and under the swivelling axis between fastening member and link in such a way that in the operating position of the link the line of application of the spring element is positioned with a spacing below the swivelling axis and the spring element draws the link downwardly in the direction of the window pane to be cleaned. The points of articulation of the spring element on the yoke and the point of articulation of the yoke on the fastening member are thereby positioned on a straight line below the swivelling axis. The link can be brought into a stable tilted position by swivelling about the swivelling axis, in which tilted position the link rests against the upper side of the fastening member by means of a lengthening bent therefrom. Here the tilting angle amounts to about 45 degrees. The points of articulation of the spring element and the point of articulation of the yoke on the link are thereby positioned on a straight line beyond the dead center of the spring element relative to the swivelling axis. Here this stable tilted position can only be achieved, because the yoke is curved in such a way that it does not hit the tube-shaped receiver before the line of application of the spring element has passed the dead center relative to the swivelling axis. Upon a premature stop motion of the yoke the link would again snap back in the direction of the window pane, if for example the link is let off in a wiper blade exchange, so that the window pane might be damaged thereby. However because of the relatively intensive curvature of the yoke the overall height of the wiper arm i
REFERENCES:
patent: 3378874 (1968-04-01), Scinta
patent: 3405420 (1968-10-01), Smithers et al.
patent: 4559663 (1985-12-01), Bauer et al.
patent: 4564971 (1986-01-01), Pethers et al.
Bauer Kurt
Prohaska Hans
Schmid Eckhardt
Hornsby Harvey C.
Machuga Joseph S.
Seitter Robert P.
SWF Auto-Electric GmbH
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