Windscreen Wiper Connector Base Snap-Fit Locking Arms
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Solution Overview
Problem
Existing windscreen wiper devices face challenges in securely connecting the connector base to the carrier element without the use of adhesives, welding, or separate locking means, particularly in beam-style constructions, which can lead to instability and inefficiency in distributing biasing force across the wiper blade.
Innovation Solution
A windscreen wiper device featuring a pre-curved carrier element with notched lateral edges and a connector base with long and short locking arms, where the connector base is made of injection molded plastic and includes projections that snap into notches, allowing for secure engagement without adhesives or welding, facilitating easy and cost-effective assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the connector base is connected to the carrier element using adhesives or welding, then the connection strength is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces adhesive bonding or welding mechanisms with a pure mechanical locking system. The locking arms with ramped surfaces engage with corresponding features on the carrier element, creating a secure mechanical connection that eliminates the need for adhesives or welding processes, thereby reducing manufacturing complexity while maintaining connection strength
Solution Approach 2:
The connector base integrates multiple functions into a single component: the locking arms provide both the locking mechanism and the mounting structure. The base itself serves as both the structural element and the attachment mechanism, merging what would traditionally be separate components into one unified piece that simplifies assembly
2Reliability
If traditional connecting methods are used, then the connection is secure, but the assembly time and manufacturing cost increase
Solution Approach 1:
The locking arms are pre-formed with ramped surfaces during manufacturing, and the connector base is designed with built-in alignment features. This preliminary preparation allows the connector to be quickly snap-fitted onto the carrier element without requiring additional assembly steps, tools, or adjustment operations, thereby increasing assembly speed while maintaining reliable connections
3Reliability
If separate locking means are used to connect the base to the carrier element, then the connection security is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The locking mechanism is integrated directly into the connector base structure. The locking arms are formed as part of the base itself rather than being separate components, eliminating the need for additional fasteners, clips, or locking mechanisms. This integration reduces the total component count while maintaining secure connection through the ramped surface engagement
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 enables a quick, simple, and firm connection of the connector base to the carrier element, ensuring a stable and efficient distribution of force across the wiper blade, enhancing the sealing performance and reducing manufacturing costs.
Implementation Method 1
The at least one short locking arm has a ramped lower surface for allowing the at least one short locking arm to snappingly engage the carrier element
Data Source
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AI summary
The windscreen wiper device includes a wiper blade that extends lengthwise in a longitudinal direction. A pre-curved carrier element with opposing lateral edges biases the wiper blade into a curved shape. At least one projection of a connector base is received in at least one notch of the carrier element for restricting relative longitudinal movement between the connector base and the carrier element. The connector base also at least one long locking arm and at least one short locking arm which engage around the lateral edges of the carrier element to lockingly connect the connector base with the carrier element. The at least one short locking arm has a lateral width which is less than the at least one long locking arm. The at least one short locking arm has a ramped lower surface for allowing the at least one short locking arm to snappingly engage the carrier element.