Muntin Clip Assembly for Pre-Notched Roll-Formed Grid Bars
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Solution Overview
Problem
The existing methods for manufacturing muntin bars for insulating glass units face challenges such as undesirable deformities and shadowing due to pre-notching, which require manual adjustment and handling, leading to inefficiencies and potential breakage in the fragile areas between notches.
Innovation Solution
A muntin clip with centrally linked lateral and longitudinal members, featuring bosses and arms that frictionally retain the clip in notches, allowing for precise coupling of muntin bars without shadowing, and a method involving pre-notching and roll forming to create contoured muntin bars with raised central sections, eliminating the need for manual cutting and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pre-notching is performed to create notches for clip insertion, then the clip can be positioned in the muntin bar, but the area between the notch and seam becomes fragile and prone to breaking
Solution Approach 1:
The notch is formed at a predetermined location away from the seam before the muntin bar is cut to final length. This preliminary positioning ensures the notch is created in a structurally sound area, preventing the formation of fragile zones that would occur if notching were performed after cutting.
Solution Approach 2:
The manufacturing process is segmented into distinct stages: first forming the notch in the continuous bar, then cutting to length, and finally assembling with the clip. This segmentation allows the notch to be created when the bar has full structural support, avoiding the creation of weak points.
2Manufacturing precision
If manual handling and adjustment are performed to correct shadowing and deformities, then aesthetic quality can be improved, but productivity decreases and breakage risk increases
Solution Approach 1:
The notch depth and position are predetermined and pre-formed during the roll-forming process, eliminating the need for subsequent manual adjustments to correct shadowing or deformities. This preliminary precision work prevents aesthetic defects before they occur.
Solution Approach 2:
The roll-forming machine automatically creates notches at the correct depth and position without requiring manual intervention. The process is self-regulating, with the forming rolls precisely controlling notch geometry, thereby eliminating manual handling and its associated risks.
3Manufacturing precision
If notching is performed after roll forming, then the seam location can be controlled, but the area between notch and seam becomes fragile
Solution Approach 1:
The notch is formed preliminarily during the roll-forming process itself, before the bar is cut to final length. This ensures the notch is created when the bar has full structural integrity, and the seam is subsequently positioned relative to the already-formed notch, not the other way around.
Solution Approach 2:
The conventional sequence is inverted: instead of cutting to length first then notching, the notch is formed first during roll-forming, and then the bar is cut to length. This inversion ensures the notch is created in a structurally sound bar, preventing the formation of fragile zones.
4Reliability
If deeper notches are used to improve clip retention, then the clip fits more securely, but shadowing and deformities increase
Solution Approach 1:
The notch depth is optimized to a specific parameter range that provides sufficient clip retention while avoiding excessive depth that would cause shadowing. The roll-forming process precisely controls the notch depth parameter to achieve this optimal balance.
Solution Approach 2:
The notch depth is predetermined and pre-formed to the exact required dimension during roll-forming, ensuring consistent depth that provides adequate clip retention without creating shadowing effects. This eliminates the need for manual deepening that would compromise aesthetics.
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 solution enables efficient assembly of muntin grids with improved aesthetics and stability, reducing manual handling and cutting costs while maintaining consistent bar heights, thus overcoming the limitations of prior art methods.
Implementation Method 1
The roll forming machine has a series of rolls configured to form sheet material into elongated tubular muntin bar stock
Implementation Method 2
first and second notches formed in first and second muntin bars, respectively. The method further includes inserting a lateral member of a clip into the first notch and coupling the clip to the first muntin bar
Data Source
AI summary
A clip for supporting a muntin grid, a muntin grid, and a method of assembly is disclosed herein. The clip includes coupled together lateral and longitudinal members, each supporting bosses, and first and second arms respectively. The clip for coupling to the first and second muntin bars via first and second notches in the respective muntin bars. The muntin bars are formed by pre-notching and then roll forming, wherein the bosses support the first and second muntin bars when the clip is coupling the first muntin bar to the second muntin bar.