Door Lock Gauge Insert and Anti-Rotation Retention Mechanism
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Solution Overview
Problem
Cylindrical locksets face challenges in accurate alignment with doors of varying thicknesses, leading to potential functional failures and increased installation complexity due to difficulties in assessing door thickness and maintaining factory preset conditions during shipping or handling.
Innovation Solution
The door lock chassis incorporates a gauge insert with multiple dimensions corresponding to different door thicknesses, allowing for precise alignment, and a retention mechanism that secures the anti-rotation member without the need for screws or bolts, freeing the installer's hands for other assembly tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lock chassis is made adjustable to accommodate various door thicknesses, then adaptability is improved, but device complexity increases due to multiple adjustment mechanisms
Solution Approach 1:
The adjustment mechanism is segmented into discrete positions marked by positive stops on the gauge insert, allowing the adjustment plate to be positioned at specific intervals rather than continuously adjusted, simplifying the overall mechanism while maintaining adaptability
Solution Approach 2:
The gauge insert is pre-configured with multiple dimensions corresponding to different door thicknesses and positive stops are predetermined during manufacturing, eliminating the need for complex real-time calculations or adjustments during installation
2Reliability
If the installer holds the anti-rotation member in place during assembly, then reliability of component positioning is improved, but ease of operation deteriorates as hands are occupied
Solution Approach 1:
The retention mechanism automatically secures the anti-rotation member in the correct position through the resilient member's elastic force, eliminating the need for the installer to manually hold the component while maintaining reliable positioning
Solution Approach 2:
The resilient member acts as an intermediary between the anti-rotation member and the lock body, providing automatic retention force that ensures proper positioning without requiring manual intervention
3Reliability
If screws or bolts are used to secure the anti-rotation member, then reliability of component retention is improved, but device complexity and ease of manufacture worsen
Solution Approach 1:
The traditional screw or bolt fastening system is extracted and replaced with an integrated retention mechanism where the resilient member is embedded within the lock body structure, reducing the number of separate components while maintaining reliable retention
Solution Approach 2:
The retention function is merged with the lock body structure itself, where the resilient member is housed within the lock body and works in conjunction with the gauge insert, eliminating the need for separate fastening hardware
Data Source
AI summary
A door lock chassis has a gauge insert that defines different dimensions corresponding to different door thicknesses. The gauge insert is positionable in the lock chassis in different orientations corresponding to the different dimensions used to align the lock chassis for different door thicknesses. Additionally, a door lock may include an anti-rotation assembly for preventing rotation of the lock chassis. The anti-rotation assembly may include a retention member that is secured to an inside hub of a lock chassis. As an anti-rotation member is displaced in a first axial direction along the inside hub to a mount position, the anti-rotational member may deflect resilient members of the retention member. With the anti-rotation member at the mounted position, the anti-rotation member may be in a frictional engagement with the previously deflected resilient members so that anti-rotation member is retained at the mount position.