Composite Guide Pin for Venetian Blind Noise Reduction
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Solution Overview
Problem
Conventional guide elements in external venetian blinds suffer from noise issues due to the guide pins striking the guide rails, especially in windy conditions, and existing solutions like keder profiles are expensive and do not adequately address the problem of noise reduction.
Innovation Solution
A guide element with shape and material properties that vary based on the pivoting position of the slats, providing better sliding properties when the blind is opened or closed and improved noise damping when the slats are closed or pivoted, achieved through a guide pin with direction-dependent dimensions and materials with different properties for sliding and soundproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If homogeneous guide elements made from single material (zinc or plastic) are used, then good sliding properties are achieved, but noise is generated due to guide pins striking guide rails
Solution Approach 1:
The guide pin is designed with different materials at different locations: a plastic section at the end for noise reduction and damping when the pin strikes the guide rail, and a metal section for structural strength and sliding properties. This local differentiation allows the same component to provide both good sliding characteristics and effective noise insulation.
Solution Approach 2:
The guide pin combines two different materials (plastic and metal) into a single composite structure. The plastic portion provides noise damping and cushioning effects, while the metal portion maintains structural integrity and sliding performance, resolving the contradiction between operational smoothness and noise generation.
2Object-generated harmful factors
If keder profiles are attached to guide rails, then noise insulation is improved, but production cost increases significantly
Solution Approach 1:
The noise insulation function previously requiring separate keder profile attachments is merged directly into the guide pin itself. The plastic section of the guide pin serves as an integrated noise-damping element, eliminating the need for additional components and reducing production complexity and cost.
Solution Approach 2:
The noise insulation function is extracted from the guide rail system (removing the need for keder profiles) and transferred to the guide pin. This extraction simplifies the overall system by eliminating expensive auxiliary components while maintaining the desired noise reduction效果.
3Reliability
If sufficient play is provided between guide pins and guide rails, then fault prevention is improved, but noise from pin striking rail increases
Solution Approach 1:
The end section of the guide pin is designed with different material properties (plastic) that change the physical parameters of the pin-rail interaction. The plastic material provides both the necessary play for fault prevention and inherent damping characteristics that reduce noise, allowing simultaneous achievement of reliability and noise reduction.
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 guide element effectively reduces noise and maintains smooth operation by minimizing the gap between the guide pin and guide rail, reducing noise and vibrations when the slats are in closed or pivoted positions.
Implementation Method 1
one area (19) is made from a first material (21) having good sliding properties and another area (21) is made from a second material (22) having good soundproofing properties or is elastically resilient
Implementation Method 2
which rest on the contact surfaces of the guide rail and are elastically deformed in the process
Data Source
AI summary
The guide element (3) comprises a fixing portion (9) at one end and a guide pin (11) at another end. The fixing portion having a non-circular cross-sectional shape is provided for attaching with a narrow-side end of a slat. The guide pin is projected beyond the plate end through a guide slot (7) in guide rail (1) during assembled state. The guide slot is defined between two guide edges (5) of the guide rail that is in C-shaped cross section.