Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1997-06-05
1999-09-07
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525046, 1525032, 1525033, B60S 138, B60S 140
Patent
active
059467649
ABSTRACT:
A windshield wiper blade assembly equipped with a combination of tilting secondary yokes (38) and airflow deflectors (44) articulated thereon, to provide smooth operation and wind lift resistance at a broad range of driving speeds. Wiper blade assembly (24) is mounted on a distal end of a wiper arm (22) and is driven in a reciprocating motion across a windshield (20). The wiper blade assembly has a wiping element (46) attached to a supporting structure that includes a main yoke (34), two secondary yokes (38) and possibly tertiary yokes (40). Dual-pivot hinges (42) are introduced between main yoke (34) and secondary yokes (36) of the wiper blade. As wiper blade (24) sweeps across windshield (20), the friction force causes limited tilting or canting of the tilting substructure, which includes secondary yokes (38), tertiary yokes (40) and wiping element (46). The tilting produces desirable chatter-resistant angle of attack and reduces squeak. The tilt angle is generally different for each sweep direction. Airflow deflectors (44) are attached to the tilting substructure, generally on the opposite side of the longitudinal pivot axis than wiping element (46). The airflow deflectors produce aerodynamic forces that counterbalance the airflow pressure on wiping element (46), thereby preventing the wiper from being flipped to the undesirable angle of attack by the airflow. Thus, chatter and squeak is prevented at a broad range of driving speeds. Additionally, the airflow deflectors prevent wiper blade liftoff. In an alternative embodiment, one longitudinal pivot hinge (200) is introduced at the connection between main yoke (34) and wiper arm (22). The longitudinal pivot hinge is combined with main yoke airflow deflector (204) and secondary yoke airflow deflectors (206), to accomplish the same results as the primary embodiment.
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