Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1983-05-23
1985-07-02
Feldman, Peter
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525032, 1525035, B60S 134, B60S 140, B60S 144
Patent
active
045258910
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a windscreen wiper system designed for vehicles, in particular for road vehicles. This system is characterised by a non-circular path of any one of the points of the windscreen wiper(s) associated therewith. A path of this type is designed to improve visibility and cleaning quality with respect to conventional systems having a circular path.
A number of systems having a non-circular path have been proposed. These include in particular the systems described in the French Patent Specification Nos. 2 239 873, 2 194 173, 2 178 682 and 1 178 683. These systems are characterised in particular by the presence of a single blade articulated on a single blade-holder arm whose axis of rotation is displaced.
Other windscreen wiper systems designed to provide a wiping area of rectangular shape have been proposed. These basically involve the systems defined in the patent Nos. 2 131 446 and 2 144 269. The organisation of these systems is substantially different from that described in the patents mentioned in the preceding paragraph. These systems basically contain a guide arm, in addition to a blade and a blade-holder arm. The mechanical arrangement of these elements is such that the articulation of the blade on the blade-holder arm describes a rectilinear path and the guide arm maintains the axis of the blade in fixed direction perpendicular to this path.
None of the systems mentioned above have as yet been put into practice, basically because their construction has proved to be uneconomical, their size prohibitive or their service life problematical.
The invention proposed uses a mechanical arrangement which associates two closed kinematic chains having certain elements in common which constitutes a mechanism having two input movements.
A first kinematic chain is constituted by a shaft rotating with respect to the bodywork, a main guide arm articulated on this shaft via a pivot joint, a rocker articulated on one hand on the guide arm and, on the other hand, on the blade--possibly divided--by means of pivot joints. All the elements of this chain are contained in a plane containing the axis of the shaft or parallel to this shaft. This plane is provided with an oscillating movement by means of the shaft which constitutes the input element of this first kinematic chain.
The second kinematic chain comprises at least one element common to the first chain--the rocker--as well as its own elements--a secondary guide arm articulated at two points thereon, each articulation comprising at least two pivot joints, one of the above-mentioned articulations connecting it to the rocker.
In a first variant, the articulation of the secondary guide arm which does not provide the connection of the said arm with the rocker may connect the said arm to a crankshaft mounted pivotably with respect to the bodywork. The crankshaft then constitutes the second input element of the mechanism. The arrangement of the crankshaft is generally of any type with respect to the axis of the input shaft of the first chain. Consequently, the movement of the secondary guide arm is spatial and takes place outside of the oscillating plane containing the blade.
In the case referred to, in which the blade wipes a plane window screen, perpendicular to the input shaft and parallel to the main guide arm, the function of the first kinematic chain is to set at all times the angular position of the blade, and the function of the second chain is to compel a given point of the blade to describe a path which diverges from a circumference. This spacing is defined by the excentricity of the crankshaft, by the arrangement of the articulations of the rocker and by the articulation of the axes of the shafts of the two kinematic chains.
This provides a first advantage of the invention. As a result of a suitable arrangement of these articulations, an amplification of the movement of the crankshaft is produced which sets the spacing of the circular path. A considerable spacing may be obtained by a low degree of excentricity and the mechanism may be r
REFERENCES:
patent: 1660971 (1928-02-01), Lindner
patent: 2286449 (1942-06-01), Wahlberg
patent: 2642612 (1953-06-01), Smulski
patent: 3831219 (1974-08-01), Deutscher et al.
patent: 3852845 (1974-12-01), Quinlan et al.
patent: 3893204 (1975-07-01), Kolb
Flamme Jean-Marie G.
Leroy Andre R.
LandOfFree
Windscreen wiper system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Windscreen wiper system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Windscreen wiper system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-374475