Adjustable Door Latch With Rear Anti-Card Locking
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Solution Overview
Problem
Existing latches with anti-card systems face reliability issues due to reduced bolt length, weak drive systems, and complex configurations that compromise performance and security.
Innovation Solution
A latch design with an adjustable anti-card system and length regulation, featuring activation, locking, and displacement strips, allowing the bolt to be housed fully or partially within the body, and a pivoting locking surface to prevent unwanted opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anti-card system is located in the front part of the latch, then the anti-card function is achieved, but the bolt length is reduced weakening the attachment between the bolt and the door frame
Solution Approach 1:
The anti-card system is relocated from the front part (longitudinal dimension) to the rear part of the latch body, changing its spatial position to a different dimension along the same axis. This allows the bolt to maintain full length for strong attachment while the anti-card system operates from the rear, preventing manipulation without compromising bolt strength.
Solution Approach 2:
The invention uses a follower mechanism that copies the movement of the bolt to activate the anti-card system. Instead of directly coupling the anti-card system to the bolt at the front, a follower at the rear replicates the bolt's motion to trigger the anti-card locking action, thereby maintaining bolt length while achieving the same functional effect.
2Adaptability or versatility
If the system for adapting the length of the latch is located in the rear part, then the length adaptability is improved, but the drive system becomes weak reducing latch performance
Solution Approach 1:
The latch body is designed with adjustable length characteristics, allowing it to adapt to different door thicknesses. The anti-card system is configured to maintain effective engagement across different latch lengths, ensuring that the drive system remains strong regardless of the selected length configuration.
Solution Approach 2:
The anti-card system is positioned at a specific location in the rear part of the latch body where it can effectively engage with the strike plate recess. This localized positioning ensures that the anti-card function operates with sufficient mechanical advantage even when the overall latch length is reduced for thinner doors.
3Adaptability or versatility
If both the length adaptation system and anti-card system are located in the front part, then both functions are integrated, but the configuration becomes very complex and expensive
Solution Approach 1:
The length adaptation function is extracted from the front part of the latch and implemented through the adjustable latch body mechanism in the rear part. This separation allows the anti-card system to be positioned in the rear without requiring complex front-mounted mechanisms, thereby reducing overall configuration complexity while maintaining both functions.
Solution Approach 2:
The follower mechanism serves multiple functions: it transmits the bolt movement to activate the anti-card system and also accommodates the length adaptation requirements. This multi-functional design reduces the number of separate components needed, simplifying the overall configuration while achieving both length adaptability and anti-card protection.
Data Source
AI summary
The present disclosure relates to a latch including an adjustable anti-card system, as well as to a latch with a length that is also adjustable. Additionally, the present disclosure relates to a door including a latch such as the one mentioned.