Bent Sheet Metal Rolling Shutter Slat for Compact Retraction
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Solution Overview
Problem
Existing rolling shutter slats made of plastic or soft metals like aluminum are costly and prone to damage, while sheet metal, such as steel, is stronger and more economical but difficult to form into the complex profiles required for shutter slats.
Innovation Solution
A slat design using a single walled, continuous bent sheet of metal, with engaging and receiving tracks formed to minimize the profile and allow nesting, reducing the diameter of the rolled shutter when retracted, and incorporating a guard member and lip member to secure the slats without extrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shutter slats are made from sheet metal such as steel, then strength and cost-effectiveness are improved, but the difficulty of forming complex profiles increases
Solution Approach 1:
The receiving track is divided into separate functional elements: a guard member that prevents disengagement and a lip member that forms the engagement pocket. This segmentation allows each component to be formed independently through simpler bending operations rather than requiring complex monolithic extrusion.
Solution Approach 2:
Instead of forming the complex branched receiving track geometry through extrusion (traditional approach), the patent inverts the approach by creating the receiving track through bending and folding operations that work with the material grain and forming capabilities of sheet metal.
2Shape
If traditional extrusion methods are used to produce shutter slats, then complex geometry of engaging and receiving tracks is achieved, but manufacturing cost and material limitations increase
Solution Approach 1:
The patent employs dynamic forming processes including bending, folding, and creasing operations that can be applied to sheet metal to create complex three-dimensional geometries. These dynamic forming methods replace static extrusion processes, enabling the use of sheet metal while achieving the required track geometries.
Solution Approach 2:
The patent changes the manufacturing parameters from extrusion (high temperature, high pressure, continuous feed) to sheet metal forming (room temperature, localized pressure, batch processing). This parameter change enables the use of steel sheet metal while achieving complex track geometries through bending and folding operations.
3Ease of manufacture
If slats are made from plastic or aluminum, then ease of forming complex profiles is improved, but strength and durability decrease
Solution Approach 1:
The patent changes the material parameter from plastic or aluminum to sheet metal, and相应地 changes the forming method from extrusion to bending and folding. This parameter change enables the use of stronger, more durable sheet metal while still achieving the required complex geometries through appropriate forming processes.
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 design enables the use of cost-effective and durable sheet metal, such as steel, while minimizing the retracted shutter's profile and enhancing security and water resistance, thus reducing manufacturing costs and improving durability.
Implementation Method 1
A slat for a rolling shutter is disclosed, that comprises a single walled, continuous bent sheet that includes a curved body
Data Source
AI summary
A slat for a rolling shutter is provided that is formed as a single walled, continuous bent sheet. The slat includes a body having a hook-shaped engaging track at a first end, and a receiving track at the second end comprising a guard member and a hook-shaped lip member that form a pocket for receiving the engaging track of another slat. The guard member includes a portion of the sheet that is bent over on itself. The lip member extends from the guard member, and is spaced apart from the guard member to define an aperture that is sized and shaped to receive the engaging track of the other slat.