Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1992-02-28
1993-10-19
Hornsby, Harvey C.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525035, B60S 132
Patent
active
052533883
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to windshield wiper systems ensuring evacuation of the streams of water flowing over the windows or windscreens of vehicles, as well as cleaning of the surface through which one looks.
The windshield wiper systems are mounted on different types of vehicles and, in particular, on automobile vehicles of the car, lorry, coach type.
The present invention is applicable not only to the types of vehicles mentioned hereinabove, but also to any structure, mobile or not, presenting a windscreen of which at least a portion of the surface is covered by a wiper, such as boats or trains for example.
PRIOR ART
Conventional windshield wiper systems generally comprise a wiper arm on which is mounted a wiper and a support block connected, by one end, to the arm of the wiper and, by another end, to a driving member whose function is to give a reciprocating movement to the windshield wiper system assembly.
The wiper is maintained in contact against the surface to be wiped by means of a spring creating a return force applying the wiper against the surface to be wiped. The spring is generally mounted, by one end, on the wiper arm and, by its other end, on the support block.
The prior art windshield wiper systems employing this principle may be considered as satisfactorily performing the functions of wiping when the conditions of use do not involve a high speed of the vehicle on which the system is mounted, or when the general atmospheric conditions do not include high amplitudes of movement, wind and flowrate of water.
In fact, it has been observed that, in the case of a high speed of the vehicle, the windshield wiper arms were subjected to a force causing a detachment of the wiper with respect to the surface to be wiped, such force being all the greater as the speed of the vehicle is high. Such detachment is also all the more accentuated as the length of the wiper arm increases and as the flowrate of water grows. The generally convex shape of automobile windscreens also contributes to promoting detachment of the wiper arms. This phenomenon obviously reduces the efficiency of wiping effected by the wiper arms.
The problem thus identified is all the greater as the average speed of automobile vehicles tends to increase constantly and the use of windshield wiper systems employing one wiper arm is becoming general, whilst the search for greater driving safety in all weathers remains an essential preoccupation of professionals.
It has already been proposed to employ deflectors mounted on the wiper arm or wiper. Such deflectors have an aerodynamic shape especially designed to be able to create, by bearing with the relative wind created by the displacement of the vehicle in the air, an additional return force contributing to cancelling or reducing the force of detachment of the wipers. However, this solution remains of limited use, due to the necessarily reduced surface of the deflectors, since they must not reduce the field of vision of the driver. The effect of the additional contact force therefore remains limited. In addition, the inaesthetic appearance of such devices and their effect of drag should be taken into account.
The solution proposed by French Patent Application FR-A-2 516 461 is also known, which consists in mounting on the driving shaft of the wiper arm a tight chamber in which is mounted a piston sliding in a cylinder. The piston and the cylinder constitute a hydraulic assembly supplied by a fluid, the piston being applied, via a telescopic lever, on the arm of the wiper. This latter is, furthermore, conventionally subjected to a return force against the windscreen via a spring. Thanks to the thrust of the piston on the lever, this device thus makes it possible to furnish an additional return force of the arm towards the windscreen. The solution recommended necessitates the use of an additional energy supply, namely hydraulic energy, rendering the use of such a solution incompatible with the search for production costs which are as low as possible.
Further
REFERENCES:
patent: 4472854 (1984-09-01), Baver et al.
patent: 4736484 (1988-04-01), Baver et al.
Graham Gary K.
Hornsby Harvey C.
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