Multi-component wiper arm

• US 8,745,812 B2
• Filed: 10/29/2010
• Issued: 06/10/2014
• Est. Priority Date: 10/29/2009
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Kruse, Michael, Geise, Stephan
• Primary Examiner(s): Lee, Edmund H.
• Application Number:
  US12/915,748
• Publication Number:
  US 20110113582A1
• Time in Patent Office: 1,320 Days
• Field of Search: None
• US Class Current: 15/250.32
• CPC Class Codes: B60S 1/34 Wiper arms; Mountings therefor wiper arms provided with liquid spreading means B60S1/522; with gas spreading means B60S1/544
• CPC Class Codes: B60S 1/3801 characterised by a blade support harness consisting of several articulated elements B60S1/3803, B60S1/3806 take precedence
• CPC Class Codes: B60S 1/4064 the channel-shaped end being provided with protrusions on, or holes in, the side walls to create a pivot
• CPC Class Codes: B60S 2001/3898 method for manufacturing wiper blades

Abstract

The present invention relates to a process for producing a wiper arm for a window wiper device for a motor vehicle, with an upper arm portion, on which a mount is provided, in order to fix the wiper arm detachably to a wiper drive of the window wiper device, and a lower arm portion, which is pivotably connected to the upper arm portion, as well as at least one wiper blade holder which is pivotably connected to the lower arm portion, characterized by producing the wiper arm in a multi-component injection-molding process in which, in a first process step, the upper arm portion is injection-molded along with at least one first pivot pin formed on it by means of a first material component in a partial portion of a cavity, in a second process step the lower arm portion, pivotably connected to the upper arm portion, is injection-molded along with at least one second pivot pin formed on it by means of a second material component in a second partial portion of the cavity by encapsulation of the first pivot pin, and in a further process step at least one wiper blade holder is injection-molded by means of a third material component in a further partial portion of the cavity by encapsulation of the second pivot pin.

Claims

1. A wiper arm (1) for a window wiper device of a motor vehicle, with an upper arm portion (2), a lower arm portion (3) and at least one wiper blade holder (5), the upper arm portion (2) being pivotably connected to the lower arm portion (3) and the lower arm portion (3) being pivotably connected to the wiper blade holder (5), and with at least one mount (7), formed on the upper arm portion (2), for the detachable fixing of the wiper arm (1) to the window wiper device, characterized in that the upper arm portion (2) and the lower arm portion (3) as well as the wiper blade holder (5) are produced by means of a multi-component assembly injection-molding process, wherein the lower arm portion (3) and one of the upper arm portion (2) and the wiper blade holder (5) are formed from different types of thermoplastic materials that do not bond to each other during injection molding.

2. A wiper arm (1) according to claim 1, characterized in that the materials have different shrinkage properties such that a previously specified clearance of a fit and/or a width of a gap is/are obtained in pivoted connections between the upper arm portion (2) and the lower arm portion (3) and/or the lower arm portion (3) and the wiper blade holder (5).

3. A wiper arm according to claim 1 wherein the lower arm portion (3) and the upper arm portion (2) are formed from different types of thermoplastic materials that do not bond to each other during injection molding.

4. A wiper arm according to claim 3 wherein the lower arm portion (3) and the wiper blade holder (5) are formed from different types of thermoplastic materials that do not bond to each other during injection molding.

5. A wiper arm (1) for a window wiper device of a motor vehicle, with an upper arm portion (2), a lower arm portion (3) and at least one wiper blade holder (5), the upper arm portion (2) being pivotably connected to the lower arm portion (3) and the lower arm portion (3) being pivotably connected to the wiper blade holder (5), and with at least one mount (7), formed on the upper arm portion (2), for the detachable fixing of the wiper arm (1) to the window wiper device, characterized in that the upper arm portion (2) and the lower arm portion (3) as well as the wiper blade holder (5) are made of plastic and are produced by means of a multi-component assembly injection-molding process, wherein the lower arm portion (3) and one of the upper arm portion (2) and the wiper blade holder (5) are formed from different types of thermoplastic materials, the materials having different shrinkage properties such that a previously specified clearance of a fit and/or a width of a gap is/are obtained in pivoted connections between the upper arm portion (2) and the lower arm portion (3) and/or the lower arm portion (3) and the wiper blade holder (5).

6. A wiper arm according to claim 5 wherein the lower arm portion (3) and the upper arm portion (2) are formed from different types of thermoplastic materials, the materials having different shrinkage properties.

7. A wiper arm according to claim 6 wherein the lower arm portion (3) and the wiper blade holder (5) are formed from different types of thermoplastic materials, the materials having different shrinkage properties.