WINDSHIELD WIPER MECHANISM

• US 3,604,048 A
• Filed: 04/08/1970
• Issued: 09/14/1971
• Est. Priority Date: 04/15/1969
• Status: Expired due to Term

• Current Assignee: Hubert Mainka
• Original Assignee: Hubert Mainka
• Inventors: Mainka, Hubert
• Primary Examiner(s): Feldman, Peter
• Application Number:
  US05/029,374
• Time in Patent Office: 524 Days
• Field of Search: 15/250.15,250.16,250.17,250.19,250.2,250.3,250.34
• US Class Current: 15/250.19
• CPC Class Codes: B60S 1/3411 with means for varying wiper-blade pressure on windshield during operation

Abstract

A stationary pin is mounted on a motor vehicle adjacent the windshield thereof. A sleeve is journaled for turning movement on the pin and has limited freedom of axial displacement relative to the same. A pair of arms project from this sleeve at opposite radial sides. A windshield wiper assembly is mounted on one of the arms and biassed into engagement with the windshield. Drive means is coupled with the second arm for imparting to the same and thereby to the sleeve an oscillatory movement about the pin which, at the will of an operator, may be varied from effecting displacement of the wiper assembly between two operating positions to effecting displacement of the wiper assembly from one of the operating positions to a rest position. Guide means in form of cooperating cam and follower means is provided for imparting to the sleeve in automatic response to movement of the assembly to its rest position, an axial movement with reference to the pin in a sense exerting upon the wiper assembly a second biassing force counter to the first biassing force so that the same is either partially negated or completely negated, with the wiper assembly in the latter case being lifted off the windshield.

Claims

1. A windshield wiper mechanism, particularly for use in motor vehicles, comprising a support;

a stationary pin mounted on said support;

a sleeve journaled for turning movement on said pin and having limited freedom of axial displacement relative to the same;

a first arm projecting from said sleeve at one radial side and a second arm projecting from said sleeve at another radial side;

a wiper assembly mounted on said first arm under the influence of a first biassing force tending to move it into engagement with a proximal windshield;

drive means coupled with said second arm for imparting to the same and thereby said sleeve an oscillatory movement about said pin in a sense effecting displacement of said wiper assembly between two operating positions, and at the will of an operator from one of said operating positions to a rest position; and

guide means operative for imparting to said sleeve in automatic response to displacement of said assembly to said rest position, an axial movement relative to said pin in a sense exerting upon said wiper assembly a second biassing force counter to said first biassing force.

2. A mechanism as defined in claim 1, said guide means comprising cam means and cam follower means one of which is provided on said support and the other of which is provided on said second arm.

3. A mechanism as defined in claim 2, said cam means being provided on said second arm, and said cam follower means being provided on said support.

4. A mechanism as defined in claim 3, said cam means comprising an elongated cam track provided on said second arm, and said cam follower means comprising a roller cooperating with said cam track and mounted on said support for turning movement about an axis transverse to the elongation of said cam track.

5. A mechanism as defined in claim 1;

further comprising biassing means engaging said wiper assembly and exerting upon the same said first biassing force.

6. A mechanism as defined in claim 2, said cam means comprising a cam track provided on said support and being elongated in direction normal to the axis of said pin, and said cam follower means comprising a roller mounted on said second arm for turning movement about a rolling axis normal to the axis of said pin and to the elongation of said cam track.

7. A mechanism as defined in claim 6;

further comprising a biassing spring engaging said sleeve and tending to displace the same axially of said pin in a sense effecting engagement of said roller with said cam track.

8. A mechanism as defined in claim 4, said cam track being in form of a channel having an open side through which said roller extends into said chanNel.

9. A mechanism as defined in claim 4, said cam track having a first track portion along which said roller moves during displacement of said wiper assembly between said operating positions, and a second track portion offset with reference to said first track portion and into engagement with which said roller moves in response to displacement of said wiper assembly to said rest position.

10. A mechanism as defined in claim 7, said pin having an axial length greater than that of said sleeve and being provided with a free end;

further comprising a circlip encircling and connected with said free end; and

wherein said biassing spring is helical and surrounds said pin intermediate said circlip and said sleeve bearing against both with opposite ends.