Fabric Roller Blind Locking Mechanism for Uneven Tension
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Solution Overview
Problem
Existing fabric roller blinds require wider lateral guideways and larger coupling levers to accommodate the locking mechanism, increasing production costs and being unsuitable for installations with floor elevation differences, where one guideway is longer than the other, leading to uneven fabric tension.
Innovation Solution
The design features compact lateral guideways with slider elements and locking elements that allow the bottom bar to be locked without relying on large coupling levers, enabling correct traction and sliding even in non-parallel guideways, and adjustable locking element placement to maintain equal fabric tension across the blind.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling levers and locking mechanism are added to lock the bottom bar at base ends, then the blind can be locked in extended position, but the lateral guideways must be wider and production costs increase
Solution Approach 1:
The locking mechanism is segmented into separate components: a locking element with a shaped channel and an abutment portion, rather than using a single integrated coupling lever. This segmentation allows the locking function to be achieved with more compact dimensions.
Solution Approach 2:
The locking function is extracted from the lateral guideway structure itself and implemented as a separate locking element that can be independently positioned and adjusted, removing the requirement for wider guideways to accommodate integrated locking mechanisms.
2Reliability
If coupling levers are used for locking, then the bottom bar can be locked, but the coupling levers must be large to sustain traction force
Solution Approach 1:
The force transmission path is segmented by separating the guiding function from the locking function. The engagement portion handles force transmission while the guiding portion provides precise positioning, allowing each component to be optimized for its specific function rather than requiring oversized levers to handle all forces.
Solution Approach 2:
The locking element introduces a new dimensional aspect to the locking mechanism by using a shaped channel that guides the engagement portion through a specific path, allowing locking to occur through geometric constraint rather than relying solely on the size and strength of the coupling lever.
3Adaptability or versatility
If base ends are fixed at different distances due to floor elevation differences, then installation is possible on non-level floors, but fabric tension becomes uneven
Solution Approach 1:
The locking element is made adjustable in position along the lateral guideway, transforming a static fixed-position system into a dynamic adjustable one. This allows the locking elements to be positioned at different heights or locations to compensate for floor elevation differences and maintain even fabric tension.
Solution Approach 2:
Each locking element can be independently positioned at its optimal location along the lateral guideway, allowing local adjustment to compensate for non-uniform conditions such as floor elevation differences, rather than requiring uniform positioning throughout the entire system.
4Ease of manufacture
If standard size lateral guideways are used, then production costs are reduced, but the locking mechanism cannot be accommodated
Solution Approach 1:
The locking mechanism is extracted from the lateral guideway structure and implemented as a separate, independently mounted locking element. This allows standard-size guideways to be used while still providing locking functionality through the separate locking element that attaches to the bottom bar.
Solution Approach 2:
The locking element serves multiple functions: it provides locking capability, guides the engagement portion during operation, and can be adjusted to accommodate different installation conditions. This multi-functionality is achieved in a compact form that fits within standard guideway dimensions.
Data Source
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AI summary
A fabric roller blind, which comprises: a take-up roller (4) around which a fabric (5) can be wound; two lateral guideways (7) parallel and alongside each other; a bottom bar (6) fixed to the lower edge of the fabric (5) and provided with two lateral ends (14) slidably engaged with the respective lateral guideways (7); two slider elements (19), each of which slidably constrained to the bottom bar (6) and provided with an engagement portion (20), slidably engaged with the corresponding lateral guideway (7), and with a separate guiding portion (21) fixed to the engagement portion (20); two locking elements (22), each of which fixed to the respective lateral guideway (7) and provided with a shaped channel (23) within which the guiding portion (21) of the corresponding slider element (19) is slidably inserted when the fabric (5) is in the extended position, and with an abutment portion (24) susceptible of receiving in abutment the engagement portion (20) of the corresponding slider element (19) in order to lock the bottom bar (6) to the locking elements (22).