Windshield wiper drive linkage arm with grooves

Details Windshield wiper drive linkage arm with grooves Windshield wiper drive linkage arm with grooves

2006-06-13

2006-06-13

Graham, Gary K. (Department: 1744)

Brushing, scrubbing, and general cleaning

Attachments

Optical-member-attachable cleaner

C015S250310, C015S250270, C403S122000, C403S133000, C074S57900F, C074S581000, C074S042000, C074S043000, C074S584000

Reexamination Certificate

active

07059009

ABSTRACT:
This invention relates to windshield wiper system and method which utilizes a flexible member to account for compression loads in excess of a predetermined load, such as 30 percent greater than a maximum load for the flexible member. The system utilizes a flexible pultruded composite material having a relatively low modulus of elasticity, yet relatively high elongation characteristics. The flexible arm bends to facilitate preventing damage to components in the wiper system when a compressive load applied to the flexible member reaches a predetermined load as a result of a fatigue condition, such as snow or ice build up on the windshield. In one embodiment, the predetermined load is defined as:in-line-formulae description="In-line Formulae" end="lead"?PCR=KE=1.3Plink;in-line-formulae description="In-line Formulae" end="tail"?where:PCR=the predetermined load;Plink=a maximum normal running load for a comparably-sized steel or rigid link which does not flex;K⁢⁢is⁢⁢a⁢⁢coefficient=π2⁢IL2;E is the flexural modulus (MPa)and I is a moment of inertia in mm4and L is a length (mm) of flexible arm28.

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