Angled End Rod With Removable Stop Profile
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Solution Overview
Problem
Conventional angled end rods for roller shutter curtains are difficult to assemble due to the need for materials with high flexibility or complex structures, and they often require significant bending stresses that can lead to material deformation or breakage, especially when made from materials like PVC or aluminum.
Innovation Solution
An angled end rod design featuring a removable stop profile with a carrier section that hooks into an undercut side wall recess, allowing for easy assembly without severe deformation, using a latching connection or rubber-elastic material for secure fastening and sealing, eliminating the need for flexible materials and complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop bar is inserted through a side wall opening and hooked in an inner body, then the stop can be securely fastened, but the structure becomes complex and weighty
Solution Approach 1:
The patent removes the complex elastic inner body from the structure. Instead of hooking the stop bar into an inner body, the stop bar is directly inserted through a side wall opening and secured by a simple undercut recess in the end rod profile itself, eliminating unnecessary structural complexity while maintaining secure fastening
Solution Approach 2:
Instead of using an elastic inner body that deforms to capture the stop bar, the patent inverts the approach by creating an undercut recess that mechanically interlocks with the stop bar's projection. The rigid structure with undercut geometry replaces the flexible elastic body, achieving secure fastening through geometric constraint rather than material elasticity
2Ease of operation
If the stop bar is clipped into the end bar from the front side, then assembly is simplified, but the end bar material must have high flexibility
Solution Approach 1:
The patent changes the material parameter from flexible to rigid by introducing an undercut recess in the rigid end rod profile. This undercut geometry allows the stop bar projection to be mechanically captured without requiring the end bar material to deform elastically, enabling the use of rigid materials like aluminum or hard plastics while maintaining ease of assembly
Solution Approach 2:
The undercut recess acts as an intermediary mechanical feature that mediates between the rigid end rod profile and the stop bar. It provides the necessary retention force through its geometric shape rather than through material flexibility, allowing rigid materials to be used while still enabling simple clipping assembly from the front side
3Ease of operation
If significant bending stresses are applied during assembly, then the stop bar can be inserted into the recess, but the end bar material may deform or break
Solution Approach 1:
The undercut recess is pre-formed in the end rod profile during manufacturing, eliminating the need to apply bending stresses during assembly. The stop bar projection simply needs to be inserted into the pre-prepared undercut geometry, which naturally captures the projection without requiring forceful deformation of the end bar material
Solution Approach 2:
The patent converts the potential harm of bending stresses into a benefit by using the undercut recess geometry. Instead of applying harmful bending forces to insert the stop bar, the undercut shape itself provides the retention mechanism, turning what would be a harmful deformation process into a simple geometric interlocking solution that protects material integrity
Data Source
Figure 1~3
AI summary
The angle end rod has a removable stop profile (2) with stop section (3) to restrict the winding up of the shutter. An end rod profile (1) has a recess (6) cut into the side wall at the top to engage with an upper projection (5) on a support section (4) of the stop profile. A detent section on a vertical connecting face of the end rod profile connects with another detent section on the connecting face of the support section underneath the side wall recess for extra security. Independent claims describe end profile for angle end rod, stop profile for angle end rod and a rubber profile for an angle end rod.