Roller Tube Slit-Hook Attachment for Fast Screen Cloth Assembly
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Solution Overview
Problem
Conventional wind-up screen assemblies are cumbersome and time-consuming to assemble, and replacing the cloth in these systems is equally challenging.
Innovation Solution
A wind-up screen assembly with a roller tube featuring a slit that provides access to an internal chamber wider than the slit, allowing a hook-like fastening member on the cloth end to be inserted via the slit, thus facilitating easier assembly and attachment to the roller tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional plastic insert with hem is used to attach the cloth to the roller tube, then the cloth can be securely fastened, but the assembly process becomes cumbersome and time-consuming
Solution Approach 1:
The fastening system is divided into separate functional elements: a hook-shaped fastening member on the cloth and a corresponding slit with internal chamber in the roller tube sleeve. This segmentation allows the cloth to be attached through a simple insertion motion rather than complex assembly steps.
Solution Approach 2:
The hook-shaped fastening member acts as an intermediary element that simplifies the attachment process. Instead of directly inserting the cloth end into the sleeve, the hook mediates the connection by engaging with the slit and internal chamber, enabling quick attachment while maintaining secure fastening.
2Reliability
If a conventional plastic insert is used at the cloth end, then secure attachment is achieved, but the internal chamber must be deep to accommodate the insert, increasing the roller tube diameter
Solution Approach 1:
The fastening member's geometry is optimized by changing its parameters - specifically shaping it as a hook with a strip width that is smaller than the slit width. This parameter change allows the fastening member to be inserted through the slit into the internal chamber, significantly reducing the required chamber depth and thus the roller tube diameter.
Solution Approach 2:
The fastening member is designed with a specific three-dimensional hook geometry that allows it to be inserted through the slit from one dimension while engaging the internal chamber in another dimension. This dimensional approach enables secure attachment without requiring a deep chamber, as the hook engages the chamber walls laterally rather than requiring deep axial space.
3Reliability
If the internal chamber is made deeper to accommodate conventional inserts, then secure fastening is possible, but more material is required and production costs increase
Solution Approach 1:
By changing the parameter of the fastening member's dimensions relative to the slit, specifically making the strip width smaller than the slit width, the internal chamber can be made shallower. This reduces the volume of material required to manufacture the roller tube while maintaining secure fastening capability.
Data Source
Figure 1~11
AI summary
The invention relates to a wind-up screen assembly, comprising a cloth and a roller tube for winding the cloth around. A sleeve of the roller tube comprises a slit providing access to an internal chamber in the sleeve. The chamber is wider than the slit and extends beyond both edges of the slit. An end of the cloth comprises a hook for fastening the cloth to the roller tube. The hook comprises a strip defining a first leg for catching behind a first edge of the slit. The slit's width is smaller than the strip's width. A distance from a side wall of the chamber to the first edge of the slit is equal to or greater than the width of the strip to enable insertion of the strip into the chamber via the slit.