Adjustable Hinge for Fire Door Alignment
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Solution Overview
Problem
Existing door assemblies face challenges in meeting stringent clearance requirements due to inconsistencies in wall plumbness, frame squareness, and header level during real-world installations, which can lead to failure in fire and smoke door tests.
Innovation Solution
An adjustable door hinge with three adjustable components: a frame leaf with adjustment buttons for lateral movement, a door leaf with slotted screw holes for adjustment against the frame, and locking pins with adjustable bearings for height adjustment, allowing for plumb, square, and leveling adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the door is manufactured perfectly square in ideal factory conditions, then the door meets manufacturing precision requirements, but the door cannot accommodate real-world installation variations in wall plumbness and frame squareness
Solution Approach 1:
The hinge assembly is designed with adjustable components that allow dynamic repositioning of the door relative to the frame. The door leaf includes elongated adjustment slots and multiple mounting hole patterns, enabling the door to be repositioned in multiple dimensions to accommodate variations in wall plumbness and frame squareness while maintaining proper clearance and sealing.
Solution Approach 2:
The hinge assembly provides adjustable parameters including vertical position (via spacer thickness), horizontal position (via adjustment slots), and rotational alignment. By changing these parameters, the door can be precisely positioned to meet clearance requirements despite variations in the rough opening dimensions and frame installation accuracy.
2Manufacturing precision
If additional adjustment accessories are added to remedy clearance issues, then the door alignment can be corrected, but the installation cost and complexity increase significantly
Solution Approach 1:
The adjustment mechanisms are integrated directly into the hinge assembly itself rather than being separate accessories. The hinge combines the pivot function with adjustment capabilities through integrated features including adjustment slots, multiple mounting patterns, and repositionable components, eliminating the need for separate adjustment devices and reducing overall system complexity.
Solution Approach 2:
The hinge assembly serves multiple functions: it provides the primary pivot function for door operation, enables vertical and horizontal position adjustment, allows rotational alignment correction, and facilitates clearance adjustment. This multi-functionality consolidates what would traditionally require multiple separate components into a single integrated assembly.
3Reliability
If the door is adjusted to meet clearance requirements in non-plumb walls, then fire door test compliance is achieved, but the adjustment process becomes time-consuming and complex
Solution Approach 1:
The hinge assembly is pre-designed with adjustment capabilities built in, including elongated slots and multiple mounting patterns, so that adjustment can be performed during installation without requiring additional steps or components. The adjustment features are prepared in advance during manufacturing, allowing field installation personnel to simply select and configure the appropriate positions rather than performing complex adjustments.
Data Source
AI summary
An adjustable hinge is disclosed. The adjustable hinge includes a door jamb or frame leaf hinge plate and a door leaf hinge plate. The adjustable hinge includes at least one height adjustment spacer configured to a move a position of the door leaf hinge plate relative to the jamb hinge plate. The jamb or frame leaf incudes a set of holes for receiving spacers or shim buttons for adjusting a spacing of the jamb or frame leaf hinge plate relative to the door jamb. The door leaf hinge plate includes slots for receiving mounting hardware for adjusting a position of the door leaf hinge plate relative to the door's edge.