Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1995-07-07
1996-11-26
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525034, 15250351, B60S 132, B60S 134
Patent
active
055772927
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to windscreen wiper systems, and in particular wiper systems that employ a means for forcing the wiper blade on the windscreen wherein the forcing means is variable through an adjusting mechanism.
BACKGROUND OF THE INVENTION
It is known in the art that especially at high vehicle speeds the slip stream strikes the windscreen of the vehicle so forcefully that, during bleed-off, an upward pressure is generated on the wiper blades and on the wiper arms moving across the windscreen, thereby reducing the contact between the windscreen and the wiper blade to such a degree that the cleaning effect of the entire system is markedly decreased. However, in particular, at high speeds perfect cleaning of the windscreen is required in order not to jeopardize the safety of the car passengers.
In the prior art designs according to DE-OS 28 24 014 and DE-PS 40 32 762 the contact force of the wiper arm is variable through a plunger means in that a movable plunger centrally passes through the wiper shaft to swivel an adjusting lever on which is fixed the end of the wiper arm spring facing the shaft in such a way that the line of operation of the spring is varied relative to the axis of the wiper arm, thereby varying the contact force exerted by the wiper arm on the windscreen. However, such arrangements involve the disadvantage that they are complex in design, providing hardly any protection against the ingress of dirt and moisture. Moreover, in view of the adjusting mechanism, the whole system is not sleek which effects not only the outward appearance but also the coefficient of the aerodynamic drag, thereby enhancing the danger of accident.
DE-OS 40 28 494 discloses another adjusting mechanism for windscreen wiper systems of the afore-described type wherein the line of operation of the wiper arm spring is also adjusted relative to the axis of the wiper arm. In that system, the end of the wiper arm spring facing the shaft side is hooked on an adjusting lever, with the latter moving across a sliding insert. The end of the wiper arm spring facing the shaft side is moved toward and away from the windscreen, respectively. A system of this type involves the advantage that it is of a relatively simple design and a low height of construction. However, it has been found to be disadvantageous that when adjusting the line of operation of the wiper arm spring it will be necessary to act against the force of the wiper arm spring involving additional load on the drive of the windscreen wiper system. Moreover, it will be necessary for the swivel bearing of the set lever to take up all of the tension force of the wiper arm spring. As it is especially the adjusting force for the wiper arm spring that is permanently changed, no uniform run (or consistent rate of movement) of the drive of the windscreen wiper system will be possible.
It is, therefore, the object of the invention to improve a windscreen wiper of the afore-mentioned type so as to insure a uniform run and a reduced load on the drive by the forces of the wiper arm spring.
This problem, in the practice of the invention, is solved in that the set element engages a support lever to which is fixed the end of the wiper arm spring facing the shaft side and which, with the end thereof facing away from the wiper shaft, is swivably journalled within a bearing on the mounting portion.
In the arrangement according to the invention, the wiper arm spring, on the one hand, is hooked on the wiper arm and, on the other hand, on the support lever which, in turn, is supported on the mounting portions, so that the whole of the tensile force of the wiper arm spring, in a simple way, is taken up and, through the support lever, is supported on the mounting portion. The adjusting lever of the set element engaging the support lever, hence, no longer is required to take up the tensile force of the wiper are spring, thereby allowing the bearing of the set lever to be designed in an essentially simpler and less rugged way thus enhancing the sensitivity and
REFERENCES:
patent: 2844839 (1958-07-01), Krohm
patent: 4698872 (1987-10-01), Watanabe
patent: 4777695 (1988-10-01), Okuda et al.
patent: 5056182 (1991-10-01), Fukumoto et al.
patent: 5129123 (1992-07-01), Shirato
patent: 5253388 (1993-10-01), Bacronnier
patent: 5309599 (1994-05-01), Leutsch et al.
patent: 5426815 (1995-06-01), DaDeppo et al.
Blachetta Thomas
Egner-Walter Bruno
Jaisle Klaus
Graham Gary K.
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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