Crank arm assembly for windshield wiper device

Details Crank arm assembly for windshield wiper device Crank arm assembly for windshield wiper device

1987-05-21

1989-01-17

Staab, Lawrence

Machine element or mechanism

Elements

Cranks and wrist pins

1525016, B60S 124

Patent

active

047981024

ABSTRACT:
A reverse-to-park windshield wiper crank arm assembly. The assembly includes a hub on the wiper motor shaft, a control member around and rotatable relative to the hub, an intermediate link having one end pivotally connected to a crank pin on the hub and including a slot which slidably receives a guide pin on the control member, a drive lug on the hub engageable on the side of the intermediate link and a coil torsion brake spring disposed in an annular space between the hub and a surrounding inner wall of the motor housing. When the hub rotates in one direction corresponding to normal windshield wiping, the intermediate link is captured in a folded position and rotates as a unit with the hub while a tang on the hub engages a first hook-like formation on one end of the brake spring and flexes the springs to flexed conditions. Whe the hub reverses direction, the tang releases the brake spring which thereupon unflexes against the inner wall to immobilize the spring and the control member so that the hub, during continued rotation in the reverse direction, strokes the intermediate link from the folded position to an unfolded position corresponding to a parked position of the windshield wiper arms.

REFERENCES:
patent: 3665772 (1972-05-01), Beard et al.
patent: 3716887 (1977-02-01), Bellware
patent: 3717048 (1973-02-01), Carpenter
patent: 4028950 (1977-06-01), Osterday
patent: 4400844 (1983-08-01), Hayakawa et al.
patent: 4454626 (1984-06-01), Schmidt et al.
patent: 4494421 (1985-01-01), Matuoka

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