Hidden Finger Protection Roller for Heavy Doors
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Solution Overview
Problem
Existing door designs with finger protection devices fail to meet requirements for aesthetics, strength, and safety, particularly in public spaces like kindergartens and schools, as they are either visible and distracting or not robust enough to handle heavy doors.
Innovation Solution
A door design that incorporates a hidden finger protection roller with a spring-loaded protective strip, where the roller is integrated into the door frame and hinge area, ensuring the protection mechanism is concealed from view and robust enough for heavy use, while maintaining a harmonious appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a finger protection device is installed on the door, then finger safety is improved, but the aesthetic appearance of the door deteriorates due to visible protection mechanisms
Solution Approach 1:
The finger protection roller is extracted from the visible door surface and relocated to the hinge area, where it is concealed by the door frame and hinge structure. This allows the protective function to be maintained while removing the visual distraction from the door's aesthetic surface.
Solution Approach 2:
The door frame and hinge structure serve as intermediaries that conceal the protection roller. The roller is positioned in the hinge area where it is hidden by these structural elements, allowing the protective function to be provided without directly impacting the visual appearance of the door leaf.
2Strength
If the door dimensions are increased for public spaces, then the door strength requirement is improved, but the weight of the door increases
Solution Approach 1:
The hinge system is designed with dynamic characteristics, including a spring mechanism that provides progressive resistance during door closing. This allows the hinge to support heavy doors while maintaining smooth operation and reducing the perceived weight during operation.
Solution Approach 2:
The door and frame structures utilize composite construction methods and materials that provide high strength-to-weight ratios. This allows large doors to be constructed with sufficient strength while minimizing unnecessary weight, improving operational efficiency.
3Productivity
If the door and frame are designed to maximize clear width, then the productivity of space utilization is improved, but the structural strength may deteriorate
Solution Approach 1:
The hinge and frame structures are designed to utilize the third dimension (depth) more effectively. By optimizing the spatial arrangement of structural elements in the depth direction, the clear width in the horizontal direction is maximized while maintaining sufficient structural strength through vertical and depth-wise reinforcement.
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 effectively prevents finger injuries by hiding the protection mechanism, ensuring a safe and aesthetically pleasing door that meets the strength and safety demands for public spaces without compromising the door's appearance or functionality.
Implementation Method 1
A spring arranged in the finger protection roller 5 and not visible here has drawn in the protective strip 5.1.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a door comprising: - a frame; - a door leaf; - a hinge for connecting the frame and the door leaf; - a finger guard roller parallel to the door leaf, the protective strip of which covers the space between the frame and the door leaf. The door according to the invention is characterized by the following features: - the frame, viewed in a horizontal section, has a hollow profile that is at least approximately U-shaped, comprising a web and two legs; - the frame is a separate component that is connected to the door leaf in such a way that a cavity remains between the end face of the door leaf and the frame; - the finger guard roller is located in the cavity of the profile; - the web of the U has a slot for guiding the protective strip through it.