Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1997-08-07
1998-09-22
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525031, 74 96, 74 181, 74600, 74 42, 384192, 384255, B60S 134
Patent
active
058096108
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a screen wiper apparatus for a motor vehicle glass.
More particularly, the invention relates to screen wiper apparatus for a motor vehicle glass, of the type in which a screen wiper extends longitudinally in a direction parallel to the general plane of the glass to be swept, being of the type in which the screen wiper is mounted at the upper end of a spindle for driving it in alternating rotary wiping movement, the axis of the spindle being substantially at right angles to the general plane of the glass, being also of the type in which the drive spindle is mounted for rotation in a bearing which is fixed with respect to the vehicle, and being further of the type in which the drive spindle is driven in rotation by a crank which lies in a plane substantially at right angles to the axis of the spindle, and which is coupled through a linkage to a motorised reduction gear unit.
Such an apparatus enables the glass to be swept by a wiper blade strip of flexible elastomeric material which is held against the windscreen by a wiper blade carried by a screen wiper arm.
In this connection, motor vehicle glasses, and windscreens in particular, are generally curved, so that it is necessary for the screen wiper blade to have an articulated structure that forces the wiping strip into contact with the glass over its whole length.
The articulated structure of the blade also enables the contact pressure to be substantially homogeneous over the whole length of the wiping strip, and for this purpose it is deformable in a plane which is substantially at right angles to the glass to be swept, and the articulated structure holds the wiping strip in its plane of deformation by means of clips.
However, when the screen wiper blade travels over the glass in its alternating rotary wiping movement, the plane of deformation of its articulated structure does not remain strictly perpendicular to the plane of the glass being swept, due to the curvature of the glass, so that the wiping strip is in contact with the glass at an angle which varies according to the position of the screen wiper.
Now it has become apparent that such an inclination of the wiping strip is severely detrimental to the wiping quality of the screen wiper blade.
One particularly unfavourable case is the situation in which, where the glass is a motor vehicle windscreen, the screen wiper is so designed as to wipe over a rearwardly curved lateral end portion of the windscreen, finishing substantially parallel to the side support riser of the windscreen. The angle of inclination of the wiping strip with respect to the glass is then large, and can be detrimental to the effectiveness of the screen wiper in that zone.
BRIEF SUMMARY OF THE INVENTION
With a view to providing a solution to this problem, the invention proposes a screen wiper of the type defined above, characterised in that the drive spindle is mounted for rotation in the bearing by means of two spherical articulations, in that at least one of the spherical bearings is so arranged that its centre of rotation is eccentric with respect to the axis of the drive spindle, and in that the spindle is fixed to an internal spherical bush of the eccentric articulation for rotation with it, so as to cause the inclination of the axis of the drive spindle to vary with respect to the plane of the glass when the spindle is driven in rotation about its axis.
In accordance with other features of the invention: rotation is coincident with the axis of the drive spindle, so as to constitute the centre of the movement of inclination of the drive spindle; vehicle, through which the upper end portion of the drive spindle passes, and the spherical articulation the centre of which is coincident with the axis of the spindle is disposed axially on the spindle close to the bodywork panel, at an upper end of the bearing; transversely by an annular seal having a flexible membrane, the outer periphery of which is fixed on the axial end of the bearing with its inner periphery co-operating
REFERENCES:
patent: 2412319 (1946-12-01), Carey
patent: 2533963 (1950-12-01), Sacchini
patent: 2827653 (1958-03-01), Dyer et al.
patent: 2878506 (1959-03-01), Krohm
patent: 5186064 (1993-02-01), Matsumoto et al.
patent: 5647085 (1997-07-01), Edele et al.
Graham Gary K.
Valeo Systems d'Essuyage
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