Roller Blind Shaft Coupling Assembly with Locking Ring
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Solution Overview
Problem
Existing coupling assemblies for moving blind shafts to their housings fail to prevent uncontrolled movement during transport and assembly, leading to potential damage, especially in flush-mounted shutters with limited space.
Innovation Solution
A coupling assembly comprising a movable sleeve and an intermediate sleeve with a ring mechanism that locks and unlocks axial movement, allowing the movable sleeve to be partially inserted or fully seated within the intermediate sleeve, utilizing a ring with arms and notches to transition between assembly and working positions, and optionally including a spring for return force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable sleeve is allowed to move axially freely for easy assembly, then the assembly process is simplified, but uncontrolled movement during transport causes damage
Solution Approach 1:
The coupling assembly employs a dynamic locking mechanism that transitions between locked and unlocked states. The movable ring can rotate to engage or disengage from the stop face, dynamically changing the axial movement constraint of the movable sleeve. This allows the system to be protective during transport (locked state) and easy to assemble when needed (unlocked state), resolving the contradiction between protection and assembly ease.
2Reliability
If the movable sleeve is locked axially to prevent movement, then protection against damage is improved, but assembly and disassembly becomes difficult
Solution Approach 1:
The locking mechanism is designed to be self-operating through simple ring rotation. The movable ring, when rotated, automatically engages or disengages from the stop face, causing the locking action without requiring additional tools or complex operations. This self-service characteristic maintains reliability while preserving ease of assembly and disassembly.
3Reliability
If a complex locking mechanism is used to secure the sleeve, then reliability is improved, but the device complexity increases
Solution Approach 1:
The invention extracts the locking function from a complex mechanism and implements it through a simple movable ring that rotates to engage or disengage from a stop face. This minimalistic approach achieves reliable locking without adding device complexity, as the ring and stop face are integral or simple add-on components rather than complex mechanical systems.
Data Source
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AI summary
The invention relates to an assembly coupling the shaft of a roller blind to its housing, comprising a movable sleeve (1) and an intermediate sleeve (2) which move relative to each other so that the movable sleeve (1) is partially inside intermediate sleeve (2) and the coupling assembly is in its operating position when axial movement of the movable (1) sleeve inside intermediate sleeve (2) is locked and in an assembly position, when axial movement of the movable sleeve (1) inside intermediate sleeve (2) is unlocked, wherein a ring (3) is seated on the movable sleeve (11) locking axial movement of movable sleeve in the working position of the coupling assembly.