Windscreen Wiper Pin Retention via Adhesive Bonding
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Solution Overview
Problem
The existing windscreen wiper devices experience stress fractures at the connecting device due to stress forces, which can lead to the pin becoming loose and affecting the retention of the wiper blade, especially after heat treatment.
Innovation Solution
The pin is glued or form-locked inside the hole of the connecting device to reduce stress forces, using snapping means, elongate webs with shoulders, or deformation to create rivets for a secure fit, ensuring the pin remains securely connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pin is force-locked inside the hole of the connecting device, then the pin is securely retained, but stress forces increase causing stress fractures and potential loosening
Solution Approach 1:
The patent replaces the mechanical force-locking system with a chemical bonding system by gluing the pin inside the hole. This substitution eliminates stress forces and prevents stress fractures while maintaining secure pin retention through adhesive bonding rather than mechanical interference.
2Reliability
If the pin is force-locked inside the hole, then the pin is retained, but stress forces cause the pin to become loose after heat treatment
Solution Approach 1:
The patent replaces mechanical force-locking with chemical adhesive bonding to eliminate stress forces that would otherwise cause the pin to loosen during heat treatment. The glue provides temperature-resistant bonding that maintains pin retention through thermal cycles without the detrimental stress effects of mechanical locking.
3Adaptability or versatility
If the pin allows movement of the wiper blade, then the wiper blade can follow windscreen curvature, but stress forces increase at the connecting device
Solution Approach 1:
The patent replaces mechanical force-locking with adhesive bonding to eliminate stress forces at the connecting device while preserving the wiper blade's ability to move and follow windscreen curvature. The glue provides a stress-free connection that allows necessary blade flexibility without compromising connecting device strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution significantly reduces stress fractures, enhances the retention of the pin, and prevents the 'fishtailing phenomenon, thereby improving the wiper blade's stability and wiping performance, especially at high speeds.
Implementation Method 1
the pin is glued to an inner wall of the hole or the pin is form-locked (German: "Formschluss") inside the hole
Implementation Method 2
using snapping means, elongate webs with shoulders, or deformation to create rivets for a secure fit
Data Source
AI summary
A windscreen wiper device (1) of the flat blade type, particularly for automobiles, includes an elastic, elongated carrier element, as well as an elongated wiper blade (2) of a flexible material, which can be placed in abutment with a windscreen to be wiped. The wiper blade includes at least one longitudinal groove (3), in which groove at least one longitudinal strip (4) of the carrier element is disposed. A connecting device (5) is connected to the flexible material of the wiper blade by at least one pin (14), that cooperates with a recess (21) provided along an exterior edge of the longitudinal strip in order to limit any movement of the wiper blade in longitudinal direction thereof relative to the longitudinal strip at the location of the interconnection of the connecting device and the wiper blade. The connecting device has a substantially U-shaped cross-section, wherein free ends of legs (8) of the U-shaped cross-section extend inwardly so as to form grooves for receiving longitudinal sides of the wiper blade. At least one of the legs is provided with a hole (13) for receiving the pin, with the special feature that the pin is glued to an inner wall (25) of the hole or the pin is form-locked inside the hole.