Windscreen Wiper Connecting Device Pin Guide
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Solution Overview
Problem
Existing windscreen wiper devices with flat blade designs lack a robust and efficient mechanism for connecting the wiper blade to the oscillating arm, leading to potential lateral play and reduced effectiveness in wiping performance.
Innovation Solution
A connecting device with a U-shaped cross-section and movable pins that guide into holes on the longitudinal strips, ensuring secure interconnection without lateral play, and a pivotally connected oscillating arm without a joint part, utilizing a guiding channel for pin movement and a water channel for rainwater management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional connecting mechanism is used to connect the wiper blade to the oscillating arm, then the connection is simpler to manufacture, but lateral play occurs and wiping performance is reduced
Solution Approach 1:
The connecting device is divided into multiple functional components: a connecting element with guiding channels, movable pins, and a water channel. This segmentation allows each component to perform its specific function (guiding pin movement, providing water flow path, enabling lateral connection) efficiently, resolving the contradiction between connection stability and structural complexity.
Solution Approach 2:
The pin is nested within the guiding channel of the connecting device, and the longitudinal strip is nested within the U-shaped cross-section. This nesting arrangement allows the pin to move smoothly along the guiding channel during installation while being constrained laterally when mounted, providing stable connection without excessive structural complexity.
2Reliability
If pins are made movable from pre-mounted to mounted position through guiding channels, then lateral play is eliminated and connection is secured, but the installation process becomes more complex
Solution Approach 1:
The pin is pre-positioned in the connecting device at a first position that allows easy access during installation. The guiding channel is pre-formed to guide the pin along a specific path to the final mounted position, eliminating the need for complex alignment operations and reducing installation complexity while ensuring secure connection.
Solution Approach 2:
The guiding channel acts as an intermediary structure that mediates the movement of the pin from the pre-mounted position to the mounted position. It provides a controlled path that ensures proper positioning and secure connection while simplifying the installation process through guided movement rather than free-hand alignment.
3Stability of the object's composition
If the connecting device has a U-shaped cross-section with inwardly extending legs forming grooves, then longitudinal strips are securely retained, but manufacturing precision requirements increase
Solution Approach 1:
The U-shaped cross-section structure merges multiple functions into a single component: the legs form grooves for retaining longitudinal strips, the guiding channels are integrated into the leg structures, and the water channel runs through the connecting device. This merging reduces the number of separate parts and simplifies manufacturing while maintaining secure strip retention.
Data Source
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AI summary
A windscreen wiper device of the flat blade type, particularly for automobiles, includes an elastic, elongated carrier element, as well as an elongated wiper blade of a flexible material, which can be placed in abutment with a windscreen to be wiped. The wiper blade includes opposing longitudinal grooves on its longitudinal sides, in which grooves spaced-apart longitudinal strips of the carrier element are disposed. A connecting device for an oscillating arm is connected to at least one longitudinal strip by at least one pin cooperating with a hole provided in the longitudinal strip. The pin; is movable from a first position, wherein the pin in a pre-mounted position is fixed to the connecting device, into a second position, wherein the pin in a mounted position as a single constructional element is interconnecting the connecting device and the longitudinal strip.