Self-Locking End Cap for Beam Blade Wiper
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Solution Overview
Problem
Conventional windshield wiper assemblies with flexible end caps are prone to disengagement during operation, leading to potential scratching of the windshield and dislodgment of the airfoil, and are not secure against ice scrapers, while also being difficult to install and manufacture efficiently.
Innovation Solution
The design incorporates end caps with inwardly extending legs and retention tabs that bias towards a central channel, creating a self-locking mechanism with notches on the beam to prevent disengagement, combined with a contoured profile to resist inadvertent removal, ensuring secure attachment to the wiper assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end cap is made flexible to allow assembly around the beam or splines, then the ease of manufacture and assembly is improved, but the reliability and resistance to disengagement deteriorates
Solution Approach 1:
The end cap is divided into multiple legs that can independently flex during assembly, while the retention tab provides a separate locking function. This segmentation allows the cap to be both flexible during installation and secure during operation, resolving the contradiction between ease of assembly and resistance to disengagement.
Solution Approach 2:
The retention tab is designed to be flexible and movable, transitioning from a blocked position during assembly to an engaged position during operation. This dynamic behavior allows the end cap to be easy to assemble while automatically locking into place to prevent disengagement, addressing both requirements simultaneously.
2Reliability
If a separate latching mechanism is used to positively fix the end cap, then the reliability and resistance to disengagement is improved, but the device complexity and manufacturing cost increases
Solution Approach 1:
The retention tab merges the latching function into the end cap structure itself, eliminating the need for separate latching mechanisms. The tab is integrated with the cap body and works in conjunction with the beam's structural features to provide positive fixing, thereby maintaining reliability while reducing device complexity and manufacturing cost.
Solution Approach 2:
The end cap structure serves its own latching function through the retention tab, which automatically engages with the beam during assembly. This self-service approach eliminates the need for additional latching components, reducing structural complexity while ensuring reliable resistance to disengagement.
3Reliability
If the end cap is made rigid to prevent disengagement, then the reliability is improved, but the ease of assembly and installation deteriorates
Solution Approach 1:
The retention tab is designed to be flexible and movable, transitioning from a blocked position during assembly to an engaged position during operation. This dynamic behavior allows the end cap to be easy to assemble while automatically locking into place to prevent disengagement, addressing both requirements simultaneously.
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 provides a secure, easy-to-install, and cost-effective end cap design that prevents disengagement from the wiper assembly, reducing the risk of scratching and dislodgment, while being resistant to accidental removal by ice scrapers, thus enhancing the reliability and manufacturing efficiency of the windshield wiper system.
Implementation Method 1
The retention tab is biased away from the channel until the terminal end of the tab comes into abutting engagement with the notch
Data Source
AI summary
A beam blade windshield wiper assembly including a wiping element and at least one elongated beam. A pair of end caps are operatively mounted to the longitudinal ends of the beam. The end caps include a body and inwardly extending legs that together with the body define a central channel that is adapted to receive the longitudinal ends of the wiping element and the beam. The legs include a retention tab that extends in the direction of the longitudinal axis of the beam and defines a terminal end. The beam includes a notch that corresponds with the retention tab such that the beam is received in the central channel. The retention tab is biased away from the channel until the terminal end of the tab comes into abutting engagement with the notch such that removal of the end cap is prevented.