Wiping device with variable contact force for windows of motor v

Details Wiping device with variable contact force for windows of motor v Wiping device with variable contact force for windows of motor v

1993-02-01

1995-02-21

Simone, Timothy F.

Brushing, scrubbing, and general cleaning

Attachments

Optical-member-attachable cleaner

1525034, B60S 132

Patent

active

053903919

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a wiping device for windows of motor vehicles.
More particularly, it relates to a wiping device which has a wiping blade movable in an oscillating manner over the window with a contact force applied to the latter, and provided with a wiping element tipping into a track position on each change of direction, a wiper shaft driven in an oscillating movement and connected to a wiping lever located with a hub part on the wiper shaft, and a pretensioning tension spring which brings about the contact force of the wiping blade.
A wiping device is already known (DE-OS 33 14 456), in which the contact force of the wiping blade on the window is modified depending upon-the driving speed of the motor vehicle, so that, for example, the lifting-off tendency of the wiping blade, which occurs at high driving speeds, is counteracted. It is also intended for the wiping blade to be relieved in its parking position in order that a permanent deformation of the wiping rubber can be effectively countered.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a wiping device for windows of motor vehicles, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a wiping device in which a two-armed lever is mounted oscillatably on a hub part of the wiping lever and having one lever arm holding one end of the tension spring and another lever arm interacting with the longitudinally displaceable tappet so that the tappet movable by control means in relation to the other lever arm pivots the lever and at the same time increases the spring tension, wherein the control means is formed by a cam track displaceable in direction of the tappet axis and at least partially surrounding an extension of an oscillation axis and by pick-off means which interact with the track and are arranged on a rocker connected in a rotationally fixed manner with the wiper shaft and extending transversely to the oscillation axis.
When the wiping device is designed in accordance with the present invention, it has on the other hand the advantage that, as a result of the reduced contact pressure in the oscillation reversal positions, a problem-free turning action of the wiping element is obtained and the necessary drag position is achieved quickly and quietly.
It can be considered a further advantage that the wiping blade contact pressure is reduced in the parking position also, so that the undesirable permanent deformation of the wiping rubber is at the same time avoided.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a diagrammatic illustration of a first wiping device for the windscreen of a motor vehicle,
FIG. 2 shows an enlarged partially sectional illustration of the wiping device according to FIG. 1,
FIG. 3 shows a section through the wiping device according to FIG. 2 along the line III--III,
FIG. 4 shows a diagrammatically illustrated developed view of a cam track belonging to the wiping device, with pick-off rollers assigned to this cam track,
FIG. 5 shows the resulting cross-sectional area of a section along the line V--V in FIG. 2 in an enlarged illustration, the wiping element being situated in a first operating position,
FIG. 6 shows the sectional area according to FIG. 5 with the wiping element situated in its other operating position,
FIG. 7 shows a basic illustration of a motor vehicle windscreen with a second wiping device with two wiper arms, one wiper arm of which is driven via a four-joint lever linkage,


REFERENCES:
patent: 4370774 (1993-02-01), Bienert et al.
patent: 5056182 (1991-10-01), Fukumoto et al.

Affiliated with

Also associated with

Rating

Wiping device with variable contact force for windows of motor v does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Wiping device with variable contact force for windows of motor v, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wiping device with variable contact force for windows of motor v will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1922034