Wiper Blade Coupling Member Inversion for Easy Attachment
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Solution Overview
Problem
Conventional wiper blades are inefficient for attaching and removing due to the design of the coupling device, which causes the projection to incline and become difficult to remove from the wiper arm.
Innovation Solution
A wiper blade with a coupling member featuring an elastic piece and a locking projection, supported by the elastic piece, which is pivotally coupled to the wiper arm, allowing the locking projection to be easily pushed down without inclining, facilitating attachment and removal by engaging and disengaging with a locking hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the projection of the tongue is pushed down to remove the wiper blade, then the wiper blade can be separated from the wiper arm, but the projection inclines about the hinge axis making it difficult to remove
Solution Approach 1:
The patent inverts the conventional tongue structure by positioning the hinge axis at the distal end instead of the proximal end. This inversion changes the pivot behavior: when the projection is pushed down, it moves linearly downward without inclining, allowing smooth engagement with and disengagement from the locking hole. The hinge axis rotation occurs in the opposite direction relative to the projection movement, resolving the inclination problem and improving removal efficiency.
2Reliability
If the hinge axis is positioned toward the removal direction of the wiper arm, then the wiper blade is not easily separated, but the projection cannot be easily removed from the hole
Solution Approach 1:
The patent applies inversion by relocating the hinge axis from the proximal end to the distal end of the tongue. This positional inversion fundamentally changes the mechanical behavior: the projection now moves vertically without lateral inclination when pushed down, enabling easy engagement with and release from the locking hole while maintaining stable coupling during normal operation.
Solution Approach 2:
The patent changes the geometric parameter of the tongue structure by repositioning the hinge axis. This parameter change transforms the motion trajectory of the projection from an inclined path to a vertical path, allowing the projection to be easily inserted into and removed from the locking hole while maintaining reliable coupling stability.
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
Improves working efficiency by allowing easy attachment and removal of the wiper blade, reducing the force required and preventing unintended separation, while reinforcing the coupling between the wiper arm and blade.
Implementation Method 1
The elastic piece includes a long piece, a reversed portion, a first flexing portion, and a second flexing portion. The first flexing portion and the second flexing portion extend so that the locking projection is located between the first flexing portion and the second flexing portion.
Data Source
AI summary
A wiper blade includes blade rubber, a holder body, and a clip. The clip is pivotally connected to the holder body. The clip has an elastic piece and an engagement protrusion. The engagement protrusion engages with an engagement hole provided in a wiper arm. The elastic piece section has a long piece section, a turned-back section, a first bending axis, and a second bending axis. The long piece section extends through a position to a side of the engagement protrusion. The turned-back section extends so as to change the direction of the long piece section in order to connect the front end of the long piece section to the engagement protrusion. The first bending axis and the second bending axis extend so that the engagement protrusion is located between the first bending axis and the second bending axis.