Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1997-06-02
1999-03-23
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525031, B60S 106, B60S 124, B60S 134
Patent
active
058843574
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a four-joint wiper arm for a windshield wiper system of a motor vehicle, with one joint formed between a primary shaft and a primary connecting rod, an additional joint formed between the primary lever and a coupling link, an additional joint formed between the coupling link and a supporting rod and an additional joint formed between the control lever and a supporting arbor.
Four-joint wiper arms of this type, for which the curved wiping movement of the wiper blade on the windshield is combined with an additional lifting movement in the longitudinal direction of the wiper blade, are known, e.g., from DE 4,214,679 A1 or EP 0,537,059 A1. In both cases, both the primary lever as well as the control lever are connected to the coupling link by means of a respective one arbor, with both arbors running parallel to each other and perpendicular to the pendulum plane of the coupling link. It is known that the wiper blade must be pressed against the windshield to be wiped with a force great enough to achieve a good wiping quality. The pressure force of the wiper blade is produced by means of a prestressed tension spring, the ends of which are secured to the wiper rod or joint section, on one hand, and to the coupling link, on the other hand, in such a way that the joint section with wiper arm, which is sealed on the coupling link so as to pivot, is moved relative to the coupling link in the direction of the windshield.
Upon contact of the wiper blade against the windshield, a tension produced by spring tension force is transmitted by the pivot bearing between joint section and coupling link into the four-joint assembly. This leads to distortion between the parts of the four-joint assembly, especially in the four pivot bearings. This stress leads, in turn, to an obstruction of the wiping movement, lessening the wiped quality. Distortion in the four-joint assembly also occurs, more specifically, if the four aforementioned joint locations are not mutually aligned with sufficient precision, which can be caused by manufacturing tolerances alone.
SUMMARY OF THE INVENTION
The purpose of the invention is to improve a four-joint wiper arm of the aforementioned type in such a way that the wiping movements can be carried out without obstruction.
In accordance with the invention, the problem is solved by means of a four-joint wiper arm for a windshield wiper system of a motor vehicle, for which a wiping movement on a wind shield is combined with an additional stroke movement in a longitudinal direction, for which one of the two joints between a coupling link and a primary lever or a control lever is in the form of a ball-and-socket joint and the other joint is in the form of a universal joint. This equips said joints with an additional degree of freedom of movement that, on one hand, enables the four-joint assembly wiper arm to be fastened in a statically defined way and, on the other hand, does not permit the distortion from occurring in the four-arm that has been described as a disadvantage. Henceforth, the wiping movement can be freed from the distortion of the four-joint assembly that has been described as a disadvantage and consequently carried out without obstruction, leading to a considerable improvement of the wiped quality.
A four-joint wiper arm is recommended as particularly advantageous, with respect to uniformity and ease of wiping movements, for which, the joint provided between the coupling link and primary lever is in the form of a ball-and-socket joint and the joint provided between the coupling link and control lever is in the form of a universal joint. This execution is distinguished by a precise guiding of the wiper arm during the wiping movements.
An embodiment in which the ball-and-socket joint is formed by a simple ball pin and associated ball cup, with the ball pin being fastened to the primary lever and the ball cup to the coupling link is regarded as a simple ball-and-socket joint between the coupling link and primary lever.
An advantageous config
REFERENCES:
patent: 4535500 (1985-08-01), Verton et al.
patent: 4546518 (1985-10-01), Harbison et al.
patent: 4720885 (1988-01-01), Leroy et al.
patent: 4912802 (1990-04-01), Raymond
patent: 4918780 (1990-04-01), Scorsiroli
Grossmann Michael
Schill Eduard
Graham Gary K.
ITT Manufacturing Enterprises Inc.
Lewis J. Gordon
Twomey Thomas N.
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