Door Latch Guard with Locking Clasp for External Security
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Solution Overview
Problem
Existing door latches are not secure as devices can be used to unlock them from outside, despite designs intended to prevent complete opening.
Innovation Solution
A locking guard with a notch and plate is placed over the door latch, incorporating a locking clasp that prevents the latch from being opened from the outside while allowing partial opening, and is easy to install and remove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical door latch is used, then the door can be locked and partially opened, but the latch can be unlocked from outside by inserting devices through the door crack
Solution Approach 1:
A locking guard is introduced as an intermediary component between the door latch and the external environment. The locking guard includes a plate that passes through the swinging arm and a locking clasp that prevents external devices from inserting through the door crack to unlock the latch, thereby eliminating the harmful external unlocking capability while maintaining the latch's primary locking function
Solution Approach 2:
The locking guard is divided into separate functional components: a plate that interfaces with the swinging arm, a locking clasp that prevents external insertion, and a notch that engages with the latch arm. This segmentation allows each component to perform its specific function independently, ensuring comprehensive security while maintaining ease of installation and operation
2Reliability
If a locking guard is added to prevent external opening, then security is improved, but the device complexity increases
Solution Approach 1:
The locking guard is designed to perform multiple functions within a single component structure: the plate passes through the swinging arm to provide a mounting surface, the locking clasp prevents external insertion through the door crack, and the notch engages with the latch arm to maintain positioning. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving comprehensive security
3Reliability
If a locking guard with plate and clasp is used, then external opening is prevented, but the installation and removal process becomes more complex
Solution Approach 1:
The locking guard is designed to be self-aligning and self-securing. The plate passes through the swinging arm with natural alignment, the locking clasp automatically engages with the latch arm through the notch, and the entire assembly can be installed and removed without requiring additional tools or complex procedures. This self-service design minimizes the operational complexity of installation and removal while maintaining secure locking
Data Source
AI summary
A door latch locking guard 30 is provided for maintaining a door in a locked position. A door latch 10 has an existing stationary latch arm 12 and the door jam has an existing swinging arm 14 for engaging the latch arm 12 to lock the door. The present invention provides a protective locking guard 30 having a notch 38 formed therein for placing over the stationary latch arm 12, and the protective locking guard 30 also has a plate 32 for moving the existing swinging arm 14 over the plate 32. A locking clasp 40 is provided for inserting through an opening 36 in plate 32 in order to prevent the door latch 10 from being opened from the opposite side of the door.