Adjustable Door Latch Assembly with Dead Bolt Mechanism
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Solution Overview
Problem
Existing latch mechanisms struggle to accommodate varying backset settings, leading to improper installation and functionality issues, especially when the latch assembly is not configured to match the specific backset of a door.
Innovation Solution
A latch assembly that includes a cam, a latch link, a multiplier link, and a latch bar, allowing for adjustable backset settings between first and second positions, and incorporating a dead latch assembly with a displaceable dead latch link to enhance security and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch assembly is configured for a specific backset setting, then it functions properly for that backset, but it cannot accommodate different backset settings
Solution Approach 1:
The latch assembly incorporates adjustable components that allow the backset setting to be dynamically changed between different positions (2-3/8 inches and 2-3/4 inches). The adjustment mechanism enables the latch to adapt its configuration based on the required backset setting, transforming a static design into a dynamic, reconfigurable system.
Solution Approach 2:
The patent implements the ability to change the backset parameter by providing multiple adjustable positions for the latch components. The adjustment mechanism allows modification of the backset distance parameter, enabling the same latch assembly to function reliably across different backset specifications without requiring multiple dedicated assemblies.
2Adaptability or versatility
If the latch assembly is made adjustable for different backsets, then it can accommodate various door configurations, but the device complexity increases
Solution Approach 1:
The latch assembly is divided into separate adjustable components that can be independently positioned and configured. This segmentation allows each component to be adjusted to achieve the desired backset setting, simplifying the overall adjustment process compared to a monolithic redesign while maintaining versatility.
Solution Approach 2:
The adjustment mechanism serves multiple functions: it configures the backset setting, positions the latch bolt, and ensures proper engagement with the strike plate. By designing a single adjustment system that handles multiple configuration tasks, the patent reduces the need for separate adjustment mechanisms for each function, thereby limiting the increase in device complexity.
3Reliability
If a dead latch feature is added to prevent unauthorized retraction, then security is enhanced, but the ease of operation decreases
Solution Approach 1:
The dead latch feature operates periodically rather than continuously. It engages to provide security during normal operation but can be disengaged when proper authentication or operation is detected. This periodic engagement allows the system to maintain security while still permitting legitimate access, balancing security enhancement with operational ease.
Solution Approach 2:
The dead latch mechanism is designed to automatically engage and disengage based on the operational state of the latch assembly. When the latch is properly extended or retracted through legitimate operation, the dead latch feature self-adjusts its state, reducing the need for manual intervention and maintaining ease of operation while providing security enhancement.
Data Source
AI summary
A latch assembly that is adjustable between first and second backset settings. A cam is rotatable about a cam axis, and facilitates linear displacement of a latch link in a first direction. A multiplier link is rotatable about a multiplier link axis that is offset from the cam axis can be rotated in the first rotational direction by engagement with the latch link. A latch bar is coupled to the multiplier link and is linearly displaced in a second direction by rotation of the multiplier link in the first direction. The latch apparatus also includes a latch bolt that is coupled to the latch bar, the latch bolt being displaced toward a retracted position by the displacement of the latch bar in the second direction. The latch assembly can also include a dead latch link can block retraction of at least the latch bolt.