Wiper Blade Connecting Device with Inclined Pin and Retainer
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Solution Overview
Problem
Existing wiper blade connection devices are prone to separation from wiper arms during operation, leading to potential accidents and corrosion issues, and pose safety hazards during manual washing.
Innovation Solution
A connecting device featuring a hinge unit on the wiper arm with transversely disposed retainers and an adapter on the wiper blade, where the pin is hingedly coupled into a coupling hole with an inclined plane, ensuring secure alignment and preventing rotation of the wiper blade after assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wiper arm ring is simply caught in the front arc part of the wiper blade connector, then the connection structure is simple, but the wiper blade frequently separates from the wiper arm during operation
Solution Approach 1:
The connection device is divided into multiple functional components: a connector with a hook structure, a retainer with a locking mechanism, and a guide structure. This segmentation allows each component to perform its specific function - the hook provides initial engagement, the guide ensures proper alignment, and the retainer secures the connection - resulting in a reliable connection that prevents separation while maintaining reasonable structural complexity
Solution Approach 2:
The guide structure performs preliminary action by guiding the wiper arm ring into the correct position within the connector before the retainer engages. This preliminary alignment ensures that the ring is properly positioned in the front arc part of the connector, preventing misalignment and ensuring stable connection from the outset, thereby preventing frequent separation during operation
2Ease of operation
If the metal hook is exposed outward for connection, then the connection function is achieved, but the hook is readily corroded and poses safety hazards during manual washing
Solution Approach 1:
The retainer acts as an intermediary component between the exposed metal hook and the external environment. It provides protective coverage over the hook structure while still allowing the connection function to operate. The retainer can be made of corrosion-resistant material and provides a safer surface that reduces direct contact hazards during manual washing, thus protecting against both corrosion and safety hazards while maintaining connection functionality
Solution Approach 2:
The retainer functions as a protective shell that covers the metal hook. This shell structure protects the underlying metal from direct exposure to corrosive elements like water and cleaning chemicals, while still allowing the mechanical connection function to proceed. The shell provides a barrier that prevents corrosion without interfering with the ease of operation
3Adaptability or versatility
If the wiper blade connector allows rotation during assembly, then assembly is flexible, but the back of the adapter may come into tight contact with the inside of the opening causing damage
Solution Approach 1:
The guide structure performs preliminary anti-action by preventing excessive rotation of the adapter during assembly. It guides the adapter into the correct orientation and stops further rotation before the back of the adapter can contact the inside of the opening. This preliminary restriction protects the structural integrity of both the adapter and the connector while still allowing sufficient rotation flexibility for proper assembly alignment
4Device complexity
If the pin and coupling hole are coupled without angle adjustment, then assembly is simple, but the wiper blade can be separated from the wiper arm
Solution Approach 1:
The pin is designed with an asymmetric inclined plane that matches a corresponding asymmetric feature in the coupling hole. This asymmetric design creates a unique angular relationship between the pin and coupling hole that must be achieved for proper engagement. The asymmetry prevents the blade from being separated once assembled, as the inclined planes only fit together in one specific orientation, thereby ensuring connection security while maintaining relatively simple assembly procedures
Data Source
AI summary
A connecting device for connecting a wiper blade to a wiper arm. The connecting device includes a hinge unit formed at one side of the wiper arm and an adapter provided at an upper end of the wiper blade so that the adapter is coupled to the hinge unit. The hinge unit includes retainers disposed opposite to each other about an opening formed at one side of the wiper arm. A pin is transversely disposed between the retainers. The adapter includes a guide for guiding the pin and a coupling hole connected to the guide so that the pin is hingedly coupled into the coupling hole. Connection between the wiper arm and the wiper blade is achieved by sliding a projecting jaw projecting downward from the coupling hole of the adapter along an inclined plane formed at the pin of the hinge unit and rotating the wiper blade so that one side of the adapter coincides with the inside of the opening.