Mortise Lock Reinforcing Plate for Pull-Force Resistance
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Solution Overview
Problem
Conventional mortise locks lack sufficient resistance against external pulling forces, as they rely solely on screw thread engagement for key lock retention, making them vulnerable to destructive removal by burglars.
Innovation Solution
The mortise lock design incorporates a reinforcing plate with a notch and engaging parts to interlock with the key lock, and a torsional returning unit with a cam member and transmission rod to enhance structural strength and resistance, including a securing plate that abuts against the door panel for increased rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the key lock is retained only by screw thread engagement with the threaded hole in the latch unit, then the structure is simple and easy to install, but the resistance against external pulling forces is insufficient and the key lock can be easily removed by destructive forces
Solution Approach 1:
The exterior cover is divided into multiple functional components: a base plate portion for mounting, a peripheral wall for structural support, and a reinforcing plate with engaging parts for enhanced security. This segmentation allows each component to perform its specific function while collectively providing high resistance against pulling forces without excessive overall complexity
Solution Approach 2:
The retaining mechanism is extended from a single-point screw thread engagement to a multi-point three-dimensional interlocking system. The reinforcing plate with its engaging parts creates additional retention points in different spatial dimensions, distributing the resistance against external pulling forces across multiple engagement points between the key lock and the exterior cover structure
2Reliability
If the key lock is retained only by screw thread engagement, then the installation process is simple and quick, but the reliability against destructive removal is low
Solution Approach 1:
The reinforcing plate and engaging parts are pre-integrated into the exterior cover structure during manufacturing. This preliminary action ensures that the enhanced retention mechanism is already in place before installation, maintaining ease of installation while significantly improving reliability against destructive removal attempts
Solution Approach 2:
The reinforcing plate is combined with the base plate portion to form an integrated exterior cover assembly. This merging of components ensures that the enhanced retention features work together seamlessly with the mounting structure, providing reliable protection without requiring separate installation steps that would complicate manufacturing
Data Source
AI summary
A mortise lock is provided with a reinforcing plate to enhance structural rigidity and robustness for resistance against external destructive pulling forces. The reinforcing plate is disposed in abutment with an exterior cover and a door panel, and is mounted on a mounting post of the exterior cover. The reinforcing plate has a notch to receive and engage a key lock. A securing plate may be disposed between and in abutment with the door panel and a main body of a torsional returning unit which is connected to an exterior handle to further increase structural rigidity.