Windscreen Wiper Pin Positioning Mechanism
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Solution Overview
Problem
Existing windscreen wiper devices with 'flat blade' or 'yokeless blade' designs face challenges in maintaining the precise position of the wiper blade between end caps due to tolerance in rubber material and design gaps, leading to inconsistent performance.
Innovation Solution
Incorporating pins that extend perpendicular to the windscreen to engage with the wiper blade at specific locations on the longitudinal strips, blocking longitudinal movement relative to the connecting piece, thereby ensuring a durable and controlled position of the wiper blade through a snap connection mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wiper blade is connected to the connecting piece with a snap connection allowing some movement, then the connection is durable and solid, but the position of the wiper blade cannot be precisely controlled
Solution Approach 1:
The connection system is divided into two functional segments: the snap connection provides durable attachment while the pin provides precise positioning. This segmentation allows each component to fulfill its specific function without compromising the other.
Solution Approach 2:
The pin acts as an intermediary element between the wiper blade and the connecting piece. It mediates the relationship by providing precise longitudinal positioning while allowing the snap connection to maintain durability through controlled movement.
2Ease of manufacture
If the wiper blade material has tolerance of a few millimeters, then the manufacturing is simple and cost-effective, but the position control between end caps deteriorates
Solution Approach 1:
The pin system provides self-positioning functionality within the tolerances of the rubber material. The pin automatically ensures correct longitudinal positioning of the wiper blade relative to the connecting piece, compensating for material variations without requiring precision manufacturing.
Solution Approach 2:
The invention changes the critical parameter for position control from the rubber material dimensions to the pin position. By fixing the pin's location in the connecting piece and its engagement point on the wiper blade, the system achieves precision independent of the rubber material's dimensional tolerances.
Data Source
AI summary
A windscreen wiper device 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, which wiper blade includes opposing longitudinal grooves on its longitudinal sides, in which grooves spaced-apart longitudinal strips of the carrier element are disposed. Neighboring ends of the longitudinal strips are interconnected respective connecting pieces. The connecting piece comprises engaging members engaging around the longitudinal strips, wherein the strips and the connecting piece are slidably connected by means of a snap connection. At least one pin extending in a direction perpendicular to the windscreen to be wiped engages the wiper blade at a location of a hole in one of the longitudinal strips to block longitudinal movement of the wiper blade relative to the strip in a longitudinal direction thereof away from the connecting piece.