Cleaning and liquid contact with solids – Processes – Using solid work treating agents
Reexamination Certificate
1999-12-02
2001-10-23
Graham, Gary K. (Department: 1744)
Cleaning and liquid contact with solids
Processes
Using solid work treating agents
C015S250170, C318SDIG002, C318S285000
Reexamination Certificate
active
06306220
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention is based on a wiper device for vehicle windows.
There are known wiper systems for vehicle windows on the market which have a drive motor for driving a wiper, which has a wiper blade with an elastically deformable wiper lip and a carrying arm for the wiper blade. The carrying arm is pivoted against the window by a spring and the wiper lip is thereby pressed against the window and deformed. If the wiper is disposed in the parking position, then the wiper lip is put under a lot of stress by the intensive effect of sunlight, heat, and cold so that a longer lasting or permanent deformation of the wiper lip occurs, which results in an insufficient cleaning of the window. Furthermore, noise problems arise due to the slip-stick effect when wiping since the deformed wiper blade no longer flexibly adapts to the wiping direction.
DE-AS 16 80 194 has disclosed a wiper system which, in order to prevent the deformation of the wiper lip, has an adjusting device that engages the carrying arm and in the parking position of the wiper, this adjusting device pivots the carrying arm in opposition to the force of the spring and thereby reduces or neutralizes the pressing force of the wiper lip against the window. The adjusting device has a ramp that protrudes into the movement path of the carrying arm and is supported in stationary fashion perpendicular to the window and the carrying arm travels onto this ramp when it reaches the parking position.
A disadvantage in this connection is that additional means are used, for example the ramp, which can lead to an increased cost of the wiper system.
It is also disadvantageous that the lifting of the carrying arm of the wiper results in an increased space requirement, in particular the structural height, of the wiper system so that the outer or inner design of the vehicle must be changed in order to accommodate the wiper system. This is undesirable to the vehicle manufacturer for optical and economical reasons.
SUMMARY OF THE INVENTION
In accordance with the present invention the control unit has a timer so that the parking position of the wiper lip in the parking location can be alternatingly triggered at time intervals e.g. daily, weekly or monthly, particularly when the wiper device has not been operated for a predetermined time span of a month, for example.
The wiper device according to the invention has the advantage of preventing a longer lasting or permanent deformation of the elastically deformable wiper lip formed onto the wiper blade in a parking location of the wiper by virtue of the fact that this wiper lip is stored in different parking positions in the parking location.
It is particularly advantageous that the parking positions of the wiper lip correspond to the drag positions of the wiper lip when wiping back and forth. The parking positions of the wiper lip are therefore simply produced by means of a control unit through the varying approaches to the parking position. In the parking location, the wiper lip is therefore disposed in parking positions that ensue directly from the drag position of the wiper lip when wiping and therefore can be obtained without additional means.
It is furthermore advantageous that the control unit detects and stores the most recently produced parking position of the wiper lip in the parking location and, depending on this and on presets stored in the control unit, the wiper lip is stored in the other parking position so that the parking positions alternate. This occurs particularly with the next arrival at the parking location or with the arrival at the parking location after a predetermined interval of time since the most recent alternation.
It is also advantageous that a rotary motor or a reversing motor can be used as the drive motor.
Another advantage is that when the wiper device is not operated over a longer predetermined span of time, e.g. a month, and when a reversing motor is used, the control unit changes the parking position of the wiper lip without the wiper operation having to be switched on for this purpose. The wiper lip is thus likewise protected from a permanent deformation during the low-rain summer months. With the use of a rotary motor, this is only possible with the transition from a first parking position into a second parking position. The transition in the reverse direction from the second parking position into the first parking position is thereby carried out by triggering a wiping cycle.
REFERENCES:
patent: 4559484 (1985-12-01), Hirano
patent: 4904908 (1990-02-01), Buschur
patent: 16 80 194 (1975-04-01), None
patent: 2 714 641 A (1995-07-01), None
Graham Gary K.
Robert & Bosch GmbH
Striker Michael J.
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