Wiper Blade Protrusion Recess Attachment Curvature Adaptation
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Solution Overview
Problem
Existing windscreen wiper devices with 'flat blade' or 'yokeless' designs fail to securely attach the wiper blade to the carrier element, leading to movement issues and inadequate curvature adaptation on windscreen surfaces, affecting wiping efficiency.
Innovation Solution
The wiper blade and longitudinal strip are mutually fixed using protrusion/recess means, allowing for secure attachment and slight movement along the blade's curvature, with a U-shaped connecting device and joint parts providing a locking mechanism that engages the elastomeric and steel materials, enabling effective curvature adaptation without compromising wiping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper blade is securely attached to the carrier element using protrusion/recess means, then the attachment security is improved, but the ability to follow windscreen curvature is worsened
Solution Approach 1:
The connection system is segmented into multiple protrusions and corresponding recesses distributed along the wiper blade and carrier element. This segmentation allows localized secure attachment at discrete points while maintaining flexibility between these points, enabling the blade to follow windscreen curvature without compromising overall attachment security.
Solution Approach 2:
The protrusion/recess means are positioned specifically at locations where secure attachment is most critical, while other areas of the wiper blade maintain greater flexibility. This local quality approach ensures strong attachment where needed while preserving the ability to adapt to curved surfaces in other regions.
2Reliability
If the connecting device deforms the wiper blade to achieve tight fixation, then the attachment security is improved, but the wiping properties are worsened
Solution Approach 1:
The connecting device is designed to deform the wiper blade preliminarily during the assembly process, creating a tight fixation between the blade and carrier element. This preliminary deformation occurs at the connection stage rather than during operation, ensuring that wiping properties are not adversely affected during actual use.
Solution Approach 2:
The material properties of the wiper blade and connecting device are selected and configured to allow controlled deformation during assembly that achieves tight fixation, while the operational parameters during wiping remain unaffected. The deformation is localized and reversible or accommodated in a way that preserves wiping effectiveness.
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
The solution ensures a secure and flexible attachment of the wiper blade to the carrier element, allowing it to follow the windscreen's curvature while maintaining effective wiping properties, enhancing the overall performance and durability of the windscreen wiper device.
Implementation Method 1
elastomeric material (i. e. usually rubber) of said wiper blade and material of the longitudinal strip (i.e. usually steel) are forced to engage with each other in a locking manner
Implementation Method 2
The protrusion is slightly deforming said wiper blade in the form of a C at the location of the recess
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A windscreen wiper device (1) comprising an elastic, elongated carrier element, as well as an elongated wiper blade (2) of a flexible material, which includes at least one longitudinal groove (3), in which groove (3) at least one longitudinal strip (4) of the carrier element is disposed, which windscreen wiper device comprises a connecting device (6) for an oscillating arm (7), said wiper blade (2) and said longitudinal strip (4) are mutually fixated by mutually cooperating protrusion/recess means of said longitudinal strip (4) and said connecting device (6) at the location of the interconnection of said connecting device (6) and said wiper blade (2), and wherein said wiper blade (2) is allowed to move in longitudinal direction relative to said longitudinal strip (4) outside the location of the interconnection of said connecting device (6) and said wiper blade (2).