Double-Action Door with Nested Frames for Wide Opening
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Solution Overview
Problem
Conventional double-action doors have a limited door panel turning angle, restricting their ability to be opened widely in either direction, which is a safety concern for emergency escape routes and fire protection.
Innovation Solution
A double-action door design featuring a door-in-door structure with an outer and inner door frame and panel, utilizing reversed hinges to allow the door panel to be opened in either direction up to 180 degrees, combined with a bi-directional door closer for buffering and automatic closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional double-action door is used, then the door can be opened in either of two reversed directions, but the door panel turning angle is limited and cannot be widely opened
Solution Approach 1:
The door system is segmented into an outer door frame, an inner door frame, and a door panel. The inner door frame is hinged to the outer door frame, and the door panel is hinged to the inner door frame, creating a nested structure that allows independent movement of each component. This segmentation enables the door panel to achieve a wider turning angle while maintaining bi-directional opening capability.
Solution Approach 2:
The door panel is nested within the inner door frame, which itself is nested within the outer door frame. This nested arrangement allows the door panel to rotate through a larger angle (up to 180 degrees) relative to the outer door frame while still maintaining the bi-directional opening function. The inner door frame acts as an intermediate hinge mechanism that enables this nested rotation.
2Reliability
If the door panel is designed to open in a large angle for escape safety, then the escape route is improved, but the door structure becomes more complex
Solution Approach 1:
The door system performs multiple functions simultaneously: it provides bi-directional opening capability for escape safety, maintains fire protection through normal closure, and achieves a wide opening angle up to 180 degrees. The reversed hinge arrangement and bi-directional door closer work together to enable this multi-functionality within a unified structure, avoiding the need for separate mechanisms for each function.
Solution Approach 2:
The inner door frame serves as an intermediary element between the outer door frame and the door panel. It provides the necessary hinge mechanism that allows the door panel to rotate through a wide angle while maintaining connection to the outer frame. The bi-directional door closer also acts as an intermediary control mechanism that manages the closing action of both the inner door frame and door panel.
3Adaptability or versatility
If a door-in-door structure is used to achieve wide opening angle, then the door can open in large angle in either direction, but the manufacturing process becomes more complex
Solution Approach 1:
The door is divided into three main components: outer door frame, inner door frame, and door panel. Each component can be manufactured separately and then assembled together using standard hinge connections. This segmentation simplifies the manufacturing process by allowing independent production of each part before final assembly, reducing the complexity of manufacturing the entire door-in-door structure.
Data Source
AI summary
A double-action door based on two door frames and one door panel of a door-in-door architecture so arranged that the door panel is biasable relative to the inner door frame in a first direction and biasable with the inner door frame relative to the outer door frame in a second direction reversed to the first direction subject to the functioning of a bi-directional door closer.