Screen Roller Blind Oscillating Blocking Mechanism
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Solution Overview
Problem
Existing screen roller blinds and shutters have complex blocking devices that are prone to malfunction and require expert installation, and their blocking mechanisms are unreliable and easily affected by the movement of the crosspiece along the rails.
Innovation Solution
A screen roller blind with a blocking device comprising a blocking element oscillating around an axis parallel to the crosspiece's development direction, engaging with a stopping block to lock or unlock the crosspiece's position, ensuring stable and reliable blocking and release mechanisms without interference from crosspiece movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex cam device is used to block the crosspiece, then the blocking function is achieved, but the device complexity increases and reliability decreases
Solution Approach 1:
The blocking device is divided into separate functional elements: a blocking element with extensions that can rotate, and a stopping block with a locking seat. This segmentation allows each component to perform its specific function independently, reducing overall complexity while maintaining reliability.
Solution Approach 2:
Instead of using a complex cam mechanism that actively controls the blocking, the invention uses a simpler approach where the blocking element can freely rotate and the stopping block provides a passive locking position. This inversion of the control mechanism reduces complexity while achieving the same blocking function.
2Device complexity
If a blocking element with extensions rotating around an axis is used, then the blocking mechanism becomes simpler, but the reliability may be affected by crosspiece movement
Solution Approach 1:
The blocking element has extensions with specific geometric characteristics (width greater than the rail passage width) that create a local locking condition. This local quality ensures that when the extension engages with the locking seat, it provides reliable blocking regardless of minor crosspiece movements.
Solution Approach 2:
The blocking element is designed to automatically rotate into the locking position when the crosspiece reaches the stopping block. This preliminary action ensures that the blocking is established before any potential interference from crosspiece movement can occur, maintaining reliability.
3Reliability
If hooking elements are used to prevent crosspiece sliding, then the blocking function is achieved, but the device complexity and installation difficulty increase
Solution Approach 1:
The invention extracts the essential blocking function from the complex hooking element system and implements it through a simpler blocking element with extensions that engage a stopping block. This extraction removes unnecessary complexity while preserving the core blocking capability.
Solution Approach 2:
The blocking element is designed to automatically engage with the stopping block and rotate into the locking position without requiring external actuation or complex installation procedures. This self-service characteristic simplifies both manufacture and installation while maintaining reliable blocking function.
Data Source
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AI summary
Screen roller blind (12) provided with a frame (10a) comprising: a roller (11) on which said screen (12) can be wound and unwound (12); rails (13) extending from the roller (11) along an extension direction (A); a crosspiece (14) developing along a development direction (B) perpendicular to the extension direction (A) of the rails (13), and selectively sliding along the extension direction (A) of the rails (13) according to an unwinding direction (C) of the screen (12), or according to a winding direction (D) of the screen (12). Moreover, the screen roller blind (10) comprises a blocking device (100) which comprises a blocking element (15) mechanically connected to an end (14a, 14b) of the crosspiece (14) and provided with at least an extension (15a) elongated in a projecting direction (F) substantially perpendicular to the development direction (B) of the crosspiece (14), the blocking element (15) being able to oscillate with respect to the crosspiece (14), according to an axis of oscillation (E) substantially parallel to the development direction (B) of the crosspiece (14), between a locking position in which the extension (15a) is partially facing towards the winding direction (D) of the screen (12), and an unlocking position in which the extension (15a) is partially facing towards the unwinding direction (C) of the screen (12). This blocking device (100) also comprises at least a stopping block (16) fastened to one of the rails (13), susceptible of being engaged by the blocking element (15) to prevent the crosspiece (14) from sliding in the winding direction (D) of the screen (12), and a counter-thrust portion (17) mechanically connected to the crosspiece (14) and susceptible of abutting on the guide (13), upon the engagement of the blocking element (15) with the stopping block (16), to keep the blocking element (15) interfering with the stopping block (16).