Fabric Roller Blind Locking Mechanism with Segmented Retention
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Solution Overview
Problem
Existing fabric roller blinds require complex and costly motors, result in wide slits between the bottom bar and the opening, and are prone to damage due to the locking mechanism's design, increasing production costs and risk of breakage.
Innovation Solution
A fabric roller blind design featuring engagement elements and locking elements with a rotational-translation travel mechanism, using elastic elements to maintain tension and simplify the motor's operation, allowing the bottom bar to be closely aligned with the opening and reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling levers are used to lock the bottom bar to the base terminals, then the blind can be locked in the extended position, but the lateral guideways must be of increased width and the coupling levers must be of large sizes, increasing production costs
Solution Approach 1:
The locking mechanism is segmented into separate functional elements: the retention seat in the base terminal and the coupling lever in the lateral termination. This segmentation allows each component to be optimized independently, reducing the overall size and complexity while maintaining locking capability.
Solution Approach 2:
Instead of having the coupling lever rotate within the base terminal as in prior art, the invention inverts the arrangement by placing the retention seat in the base terminal and having the coupling lever slide within it. This inversion reduces the required width of the lateral guideways and the size of the coupling levers.
2Reliability
If the bottom bar is kept away from the base of the opening, then the locking mechanism can operate, but wide slits are formed between the bottom bar and the opening
Solution Approach 1:
The retention seat is preliminarily positioned in the base terminal at a lower position, allowing the coupling lever to engage it when the bottom bar descends. This preliminary positioning enables the locking mechanism to operate effectively while allowing the bottom bar to be closer to the base of the opening, minimizing slit width.
3Strength
If the coupling lever is made large to sustain traction force, then the locking mechanism is stronger, but the lateral guideways must be of increased size
Solution Approach 1:
The force transmission path is segmented through the retention seat and coupling lever arrangement, allowing the coupling lever to be smaller while still sustaining the required traction force through efficient force distribution.
Solution Approach 2:
The retention seat provides a stable, fixed structure in the base terminal that copies and distributes the load, allowing the coupling lever to be smaller while maintaining overall strength through the combined structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a structurally simple, cost-effective, and reliable blind that minimizes the risk of damage and eliminates the need for bulky seals, ensuring efficient operation and reduced production costs while maintaining fabric tension.
Implementation Method 1
a fabric roller blind... provided with an elastic element... adapted to move the retention element towards the non-interference position
Data Source
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AI summary
Fabric roller blind, which comprises: a take-up roller (4) around which a fabric (5) is windable; two lateral guideways (7) parallel to one another and side-by-side each other; a bottom bar (6) fixed to the lower edge of the fabric (5) and provided with two lateral terminations (14) slidably engaged with the respective lateral guideways (7) and provided with two corresponding engagement elements (15); two locking elements (18), each of which is fixed to a corresponding lateral guideway (7) and is arranged for constraining the corresponding engagement element (15) when the fabric (5) in extended position. More in detail, each locking element (18) comprises a support body (19) provided with a cam guide profile (21), and a retention element (20) provided with a follower portion (22) engaged with the guide profile (21) of the support body (19), in a manner such to allow at least one operating rotational-translation travel of the retention element (20) between a non-interference position and an interference position wherein the retention element (20) acts against the corresponding engagement element (15) in order to lock the bottom bar (6), maintaining the fabric (5) under tension in extended position.