Finger Guard Roller Blind Housing Flush Gap Design
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Solution Overview
Problem
Existing finger protection devices for wing doors and windows fail to minimize the gap between the frame and sash, leaving a risk of finger entrapment, especially for small children, due to their design which creates a wider gap than the door or window opening, and has a high overall height that prevents effective alignment with the lower edge.
Innovation Solution
A finger protection device with a roller blind housing that has a receiving profile flush with the lower edge, allowing for a narrow gap and an optically smooth design, featuring end caps that are latched laterally and equipped with fastening pins for secure attachment without additional space, enabling the device to be mounted easily and securely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roller blind housing is designed with a conventional structure, then it provides basic finger protection, but the gap width remains too large allowing children's fingers to be trapped
Solution Approach 1:
The patent changes the critical parameter of gap width by repositioning the roller blind housing lower on the frame and adjusting the web material tension, transforming the gap from a dangerous width that traps fingers to a safe narrow clearance that prevents entrapment while maintaining structural integrity
2Reliability
If the roller blind housing is positioned lower on the frame to reduce gap width, then finger protection improves, but the housing may interfere with floor clearance or require additional adjustment work
Solution Approach 1:
The receiving profile is designed with a flush lower edge specifically at the critical location where the web material terminates, creating a localized smooth transition that eliminates the need for additional adjustment work or floor depressions while enabling the housing to be positioned low enough for effective protection
3Stability of the object's composition
If additional fastening means are added to secure end caps, then attachment stability improves, but the device complexity and installation space requirements increase
Solution Approach 1:
The lateral latching feature and fastening pin system are merged into an integrated attachment mechanism where the end caps engage the receiving profile through both lateral latching and parallel fastening profiles, achieving enhanced stability without adding separate complex fastening systems
Solution Approach 2:
The fastening system utilizes a parallel profile arrangement where the fastening profile runs parallel to the receiving profile, moving the fastening action to a different spatial dimension (lateral area) rather than requiring additional space in the front area, thereby reducing overall device complexity
Data Source
Figure 1~3
AI summary
A finger protection device is provided on a secondary closing edge of a door or window sash, consisting of a material strip (4) that can be extended from a roller blind housing (3) attached to a frame (1) or a sash (2), a fastening profile of the free end of the material strip (4) arranged on a gap (5) opposite the roller blind housing (3), and the roller blind housing (3) equipped as a longitudinal profile with a receiving profile (7) for the material strip (4), and end caps (8) closing this, which makes it possible to minimize the width of a bottom-side gap of a stretched material strip very significantly, which is achieved by arranging the receiving profile (7) of the roller blind housing (3) with a lower end face so close to a floor surface on a frame (1) or on a sash (2),that when the sash (2) is open, the lower edge (14) of the material strip (4) extended from the roller blind housing (3) is at least flush with the lower edge (12) of a sash (2) and a gap-free lower door gap (15) is created.