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US 4,173,055 AGranted
Windshield washer pump drive mechanism
AssigneeAuto Components, Inc.
InventorsJohn Izumi, Angelo D'Orio
Life of this patent
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AssigneeAuto Components, Inc.
InventorsJohn Izumi, Angelo D'Orio
Estimating the term…
The pump drive mechanism is driven by a wiper drive motor having a drive pin adapted to revolve in a circular path, while driving the wipers, and which is displaced along a generally radially directed path outwardly of the circular path, at a prescribed point thereon, when the wipers are moved to the park position. The mechanism has a rotatable drive cam, which is connected, via a cam follower, to reciprocate the piston rod of the pump. To facilitate installation, the drive cam carries a drive pin engaging portion designed to automatically engage the drive pin, after the first actuation of the wiper motor, regardless of the initial relative positions of the drive pin and drive cam. As a result, the necessity for positioning the drive cam with respect to the drive pin in a prescribed position during installation is eliminated. A second aspect of the invention relates to the pump action termination portion of the mechamism which includes an indexable rachet wheel having evenly spaced, uniformly shaped teeth, provided to count a given number of strokes. After the given number of strokes, a substantially wedge shaped cam, carried on the rachet wheel, is moved into position as the wheel is indexed, to engage a lip on the reciprocating piston rod to prevent further pump actuation. The structure of the cam and lateral movement of the piston rod permit same to cooperate in a manner which facilitates positioning of the lip relative to the cam, thereby eliminating the necessity for the presence of a flexible tooth on the rachet wheel, heretofore required to permit sufficient "yield" in the mechanism to prevent binding of the cam and lip.
A windshield washer pump drive mechanism for use in conjunction with a windshield wiper drive motor of the type having a drive pin adapted to revolve in a circular path when the motor is actuated, and movable to a prescribed point along said circular path and then in a generally radial direction, outwardly thereof, to a park position as said motor is deactuated, said mechanism comprising a pump, a reciprocatable rod for driving said pump, movable cam means, means operably connected to said rod and said cam, to reciprocate said rod between intake and discharge positions, respectively, in accordance with the movement of said cam, and means for automatically causing engagement between said cam and said drive pin after installation of said mechanism adjacent said motor, said engaging means comprising:
A windshield washer pump drive mechanism for use in conjunction with a windshield wiper drive motor having movable output drive means, said mechanism comprising a pump, a pump housing, a reciprocatable rod extending through an opening in said housing and being operably connected to actuate said pump as said rod is reciprocated, means normally operably connecting said rod with said output drive means for reciprocating said rod in a given direction in accordance with the movement of said output drive means, and means for preventing reciprocation of said rod after a given number of pump actuations, said reciprocation preventing means comprising:
Dependencies are inferred from the claim text.