Screen wiper including means for adjusting the wiping torque
AssigneePaul Journee S.A.
InventorMaurice Journee
Life of this patent
Estimating the term…
Abstract
A screen wiper for a motor vehicle windshield comprises a screen wiper arm which is articulated about an articulation axis (X--X) on a drive head for driving the wiper arm. The wiper includes a cam connected to the drive head and a cam follower element which is connected to the screen wiper arm and which is displaced along the cam profile as a function of the relative angular displacements between the wiper arm and the drive head about the articulation axis (X--X), so as to apply to the arm a complementary torque such as to cause the value of the wiping torque to vary.
Claims8
A screen wiper that has a wiper blade for wiping a screen, said screen wiper comprising:
- a wiper arm carrying the wiper blade;
- a drive head;
- articulating means defining an articulation axis and articulating said wiper arm and the wiper blade on the drive head about said axis;
- torque applying means coupled between and to said drive head and said wiper arm with the wiper blade for applying a wiping torque to said wiper arm and the wiper blade, said torque applying means including at least one spring for applying to said wiper arm and the wiper blade a wiping torque having a value which is substantially constant for a pre-determined angular position of said wiper arm with respect to said drive head;
- and torque adjusting means coupled between and to said drive head and said wiper arm for automatically adjusting the value of said wiping torque as a function of variation in said angular position, said torque adjusting means having a cam connected to said drive head and a cam follower element connected to said wiper arm and cooperating with said cam, such that said follower is displaced along said cam as a function of relative angular displacements between said wiper arm and said drive head, so as to apply a complementary torque to said wiper arm such as to vary the value of said wiping torque, said screen wiper further including a transmission member connecting said cam follower element to said wiper arm, and loading means for applying a resilient loading force to said transmission member such that said transmission member can be displaced with respect to said wiper arm against said loading force, and means defining a pivot axis parallel to said articulation axis and mounting said transmission member on said wiper arm for pivoting movement about said pivot axis, said loading means having a resilient loading member urging said transmission member into rotation about said pivot axis in a direction to maintain said cam follower element in contact with said cam.
Dependencies are inferred from the claim text.