US 4,438,543 AGranted

Windshield wiper device

AssigneeNippon Soken, Inc.

InventorsHiroki Noguchi, Akira Fukami, Naomi Miyazaki

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Abstract

A windshield wiper device including a blade rubber, a backing holding the blade rubber in place, a support metal fixture including support claws for supporting the backing, an arm supporting the metal fixture, a spring loading the arm such that the blade rubber is forced against the windshield of a vehicle, and drive means connected to the arm for moving the arm, the metal fixture, the backing and the blade rubber in oscillating movement. The spacing interval between the adjacent two support claws is maximized at opposite end portions of the blade rubber and becomes smaller in going toward the center thereof, and a higher load is applied to the support claws near the central portion of the blade rubber than to the support claws near the opposite ends thereof, to thereby effectively avoid separation of the blade rubber from the surface of the windshield.

Claims1

Dependent claims

A windshield wiper device comprising:

a blade rubber formed of a resilient material;
a backing holding said blade rubber in place;
an arm;
drive means for driving said arm;
a primary lever pivotally attached at its central portion to an end of said arm;
a pair of secondary levers pivotally attached to opposite ends of said primary lever, each of said secondary levers having a third support claw at one end for supporting said backing;
a pair of yokes, one pivotally attached to the other end of each of said secondary levers, respectively, each of said yokes having at opposite ends first and second support claws for supporting said backing, each said first support claw being disposed outwardly from the center of said blade rubber with respect to said second support claw;
and
a spring for loading said arm to force said blade rubber against the surface of a windshield of a vehicle,
wherein said primary lever, said pair of secondary levers and said pair of yokes are arranged such that the load applied to said blade rubber is selected to satisfy the following relations (1) and (2):
L.sub.1 >L.sub.2 >L.sub.3 ( 1) and
W.sub.1 <W.sub.2 <W.sub.3 >W.sub.4 >W.sub.5 ( 2)
where ##EQU5## L.sub.1 :
spacing interval between said first and second support claws of each of said yokes;
L.sub.2 :
spacing interval between each of said second support claws and a closest one of said third support claws,
L.sub.3 :
spacing interval between said third support claws,
P.sub.1 :
load applied to said first support claws,
P.sub.2 :
load applied to said second support claws,
P.sub.3 :
load applied to the third support claws, and
f.sub.1 -f.sub.6 :
reactions applied by said backing.

23 more elements

Dependencies are inferred from the claim text.