Concealed Four-Bolt Self-Locking Door Mechanism
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Solution Overview
Problem
Current man-made threat-resistant doors lack a DOS-certified, concealed four-point latching system with one-hand operation and adjustable locking mechanisms, which is essential for providing optimal ballistic and blast resistance while maintaining aesthetics and flexibility in construction.
Innovation Solution
The door features integral concealed mortised four-bolt-strike locking assemblies with biased bolts, a roller assembly for automatic locking, and an adjustable strike plate cover to ensure smooth operation and alignment, allowing for one-hand operation and enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional heavy duty steel frames and exposed hardware are used, then forced-entry and ballistic resistance is improved, but aesthetics and clean sight lines deteriorate
Solution Approach 1:
The hardware components (latches, bolts, strike plates) are extracted from visible surfaces and concealed within mortised recesses in the door and frame. The locking mechanism is hidden behind a decorative faceplate that matches the door's aesthetic, eliminating exposed rods and industrial-looking hardware while maintaining security functionality.
Solution Approach 2:
The locking mechanism is nested within the door structure itself. Bolts are recessed into the door edge, strike plates are set into the frame, and the entire hardware system is concealed within mortised cavities, creating a nested configuration that protects both aesthetics and structural integrity.
2Strength
If multiple latch points with exposed reinforcement plates and fasteners are used, then ballistic resistance is improved, but device complexity and aesthetics worsen
Solution Approach 1:
Multiple locking functions (latch, bolt, strike plate) are merged into integrated assemblies. The reinforcement plates are concealed within the mortised structures, and the faceplate unifies the appearance of multiple locking points. The system combines multiple security functions into cohesive concealed units rather than separate exposed components.
Solution Approach 2:
The concealed mortised structure serves multiple functions simultaneously: it provides structural reinforcement for ballistic resistance, conceals hardware for aesthetics, and creates precise alignment for multiple latch points. The faceplate serves both as a decorative element and as a protective cover for the locking mechanism.
3Adaptability or versatility
If adjustable locking mechanisms are added, then adaptability to different construction types is improved, but device complexity increases
Solution Approach 1:
The strike plate includes adjustable positioning features that allow the locking mechanism to adapt to variations in door frame alignment. The faceplate can be positioned at different locations along the door edge, and the strike plate can be adjusted vertically and horizontally to accommodate construction tolerances and different door types.
Solution Approach 2:
The system allows adjustment of key parameters including faceplate position, strike plate location, and bolt engagement depth. These parameter adjustments enable the same hardware design to work with different door thicknesses, frame configurations, and construction types without requiring completely different hardware systems.
4Ease of manufacture
If conventional latch mechanisms are used, then manufacturing simplicity is maintained, but ease of operation with one-hand deteriorates
Solution Approach 1:
The latch mechanism is designed to be actuated by a simple push or pull motion on the faceplate, which automatically engages or disengages the bolts and latches. The spring-loaded bolts automatically reset to the locked position when the door closes, eliminating the need for manual manipulation of multiple components and enabling easy one-handed operation.
Data Source
AI summary
An attack, ballistic and blast resistant door that includes integral concealed mortised four bolt-strike locking assemblies where the bolts are retracted with one hand operation for opening the door and are automatically extended for locking the door with closure of the door. The door has a door frame with four adjustable concealed striker receivers within the door frame. The door has four interconnected concealed mortised bolt lock assemblies, each with a biased bolt, wherein one of the bolt lock assemblies has an engageable brake to hold all four interconnected biased bolts in retraction when the door is opened after a handle interconnected with the four biased blots is moved to a door open position. A roller assembly is provided in the one bolt lock assembly biased to extend and move out from the door when the door is opened and releases the brake and allows the biased bolts to extend and move into the strike receivers when the extended roller assembly is moved inwardly toward the door. A manually adjustable ramp is on a strike plate cover over the strike receiver opposite of the one bolt lock assembly with the engageable brake. The ramp adjustably engages the roller assembly to further move away from or toward the door to adjustably release the brake.