Tubular Latch Multiplier Mechanism for Adjustable Backset Retraction
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Solution Overview
Problem
Existing latch mechanisms face challenges in consistently retracting the latchbolt in different backset settings, leading to inefficiencies and potential limitations in door retention.
Innovation Solution
A latch mechanism with a housing assembly, bolt bar, bolt, and multiplier, where the multiplier moves the bolt by a first displacement distance in response to a second displacement distance of the bolt bar, and includes a geared multiplier for enhanced retraction, allowing for adjustable backset settings and improved door retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional latch mechanism is used, then the structure is simple, but the latchbolt cannot be consistently retracted in different backset settings
Solution Approach 1:
The latch mechanism incorporates a movable multiplier component that can be positioned at different locations along the bolt bar. This dynamic positioning allows the same mechanism to adapt to different backset distances (e.g., 2-3/8 inches vs. 2-7/8 inches), enabling consistent latchbolt retraction across various door configurations without requiring multiple fixed mechanisms.
Solution Approach 2:
The mechanism changes the effective lever arm length parameter by moving the multiplier's pivot point along the bolt bar. This parameter adjustment modifies the mechanical advantage ratio, allowing the latch to accommodate different backset settings while maintaining reliable engagement and retraction performance.
2Adaptability or versatility
If the latch mechanism is made more complex to handle different backset settings, then adaptability improves, but device complexity increases
Solution Approach 1:
The latch mechanism achieves universality through the movable multiplier design, which can be repositioned to work with multiple backset distances (2-3/8 inches, 2-7/8 inches, and other configurations). This single mechanism performs multiple functions by adjusting component positions, eliminating the need for separate latch mechanisms for different door types.
Solution Approach 2:
The dynamic repositioning of the multiplier component allows the mechanism to adapt its mechanical characteristics for different backset settings. The multiplier can be moved along the bolt bar to different pivot locations, enabling the same physical structure to serve multiple door configuration requirements.
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 mechanism provides consistent and efficient door retention across varying backset settings, enhancing security and usability by ensuring reliable latchbolt retraction through adjustable backset adjustments.
Implementation Method 1
The multiplier is configured to move the bolt by a first displacement distance in response to movement of the bolt bar by a second displacement distance, and the first displacement distance is greater than the second displacement distance
Data Source
AI summary
Certain embodiments of the present disclosure relate to a latch mechanism, including a housing assembly, a bolt bar, a bolt, and a multiplier. The bolt bar is slidably mounted in the housing assembly, the bolt is slidably mounted in the housing assembly, and the multiplier is pivotably mounted to the bolt bar. The multiplier is configured to move the bolt by a first displacement distance in response to movement of the bolt bar by a second displacement distance, and the first displacement distance is greater than the second displacement distance.