Fire Door Hinge Structure for Lateral Stability and Sealed Rolling
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Solution Overview
Problem
Existing fire door hinges face instability under major lateral forces, leading to potential disengagement and contamination risks due to open spaces between rotating elements, which compromises their operational reliability and integrity.
Innovation Solution
A hinge design featuring a cup-shaped extension on one element to house the rolling elements, along with a cylindrical shank and frusto-conical adjustment mechanism, and a stable circular support for the rolling elements, enhances stability and seals the mechanism from contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rolling elements are used in the rotation mechanism, then the hinge achieves smooth rotation, but the open space between elements allows dirt and moisture to enter
Solution Approach 1:
The patent implements a nested structure where the cup-shaped extension contains the rolling elements within its internal cavity. The rolling elements are positioned between the first and second elements, with the cup-shaped extension's inner surface forming a containment space that prevents contaminants from reaching the rolling elements while allowing rotation to occur.
2Ease of manufacture
If the hinge uses a simple open structure, then manufacturing is easier, but lateral forces can offset the longitudinal axes and cause disengagement
Solution Approach 1:
The hinge is divided into distinct functional segments: the cup-shaped extension as a separate housing component, the rolling elements as independent rotating components, and the first and second elements as separate mounting components. This segmentation allows each part to be manufactured independently with standard processes while the assembled structure provides enhanced lateral force resistance through the interlocking geometry of the cup-shaped extension and rolling elements.
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 design improves the hinge's resistance to lateral forces, preventing disengagement and protects the rotation mechanism from dirt and moisture, ensuring reliable and durable operation.
Implementation Method 1
a rotation mechanism which comprises rolling elements (such as spheres) interposed between annular races obtained one on the first element and one on the second element
Data Source
Figure 1
Figure 2~3
Figure 4a~4c
AI summary
Hinge for fire doors which is mounted on a wall (12) within a frame (13) provided with jamb, in which a shutter (14) is provided. Said hinge comprises a frame side portion (15) and a shutter side portion (16), the frame side portion comprising a first fixing plate (151) extending into a first pair of tubular pieces (152), provided at the ends of the fixing plate, the shutter side portion comprising a second fixing plate (161) extending into a second tubular piece (162). The first pair of tubular pieces and the second tubular piece are aligned with respect to each other along a longitudinal axis (Y) when said hinge is assembled. The pair of tubular pieces inside comprises a first substantially cylindrical elongated element (2) and, on both the opposite ends of the second tubular piece, a second elongated element (3) is included, also substantially cylindrical, the first and the second element being couplable to each other and rotating with respect to each other around said longitudinal axis (Y) by means of a rotation mechanism obtained on the respective ends of said elements (2,3).