Child-Proof Latch With Secondary Locking Rod
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Solution Overview
Problem
Existing child-proof latches for cupboards are easily learned by children, require complex multi-piece assemblies, and may break or be difficult for adults to operate, failing to securely prevent access to hazardous contents.
Innovation Solution
A child-proof lock mechanism featuring a retractable rod with a gear rack system and secondary locking peg, requiring a two-step operation by adults to open the latch, while being significantly more difficult for children to manipulate, with intuitive design elements and secure attachment to the cupboard frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple latch mechanism is used, then ease of operation for adults is improved, but reliability in preventing child access deteriorates
Solution Approach 1:
The latch mechanism is divided into two distinct components: a hook member with a latch and a fixed member with protrusions. This segmentation allows the system to provide both ease of operation (single-component installation) and reliability (multi-point engagement through protrusions)
Solution Approach 2:
The hook member is pre-formed with a specific geometry that includes a latch portion and engagement surfaces. This preliminary shaping ensures that when installed, the mechanism automatically provides both easy adult operation and reliable child prevention without requiring additional adjustment or complex assembly
2Reliability
If a multi-piece assembly with alignment requirements is used, then reliability in preventing child access is improved, but ease of installation deteriorates
Solution Approach 1:
Multiple functional elements (hook, latch, biasing member, and engagement surfaces) are merged into a single hook member component. This consolidation eliminates the need for precise alignment between multiple pieces during installation, while maintaining reliable child prevention through the integrated latch mechanism
Solution Approach 2:
The hook member serves multiple functions simultaneously: it provides the latch mechanism for secure engagement, incorporates the biasing member for automatic latching, and includes the engagement geometry for multi-point contact with the fixed member. This multi-functionality achieves reliability without requiring multiple separate components
3Ease of manufacture
If adhesive attachment is used, then ease of installation is improved, but reliability in maintaining secure attachment deteriorates
Solution Approach 1:
A separate fixing component is introduced as an intermediary between the hook member and the cupboard surface. This fixing element provides a secure mechanical attachment point, while the hook member itself remains easily replaceable or adjustable, combining installation ease with attachment reliability
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 lock mechanism effectively prevents children from opening the cupboard while allowing easy operation for adults, ensuring secure storage and automatic resetting to the locked position, enhancing safety and durability by simplifying installation and reducing the risk of damage.
Implementation Method 1
a biasing member (springs, etc.) to bias the latch member against the hook member
Data Source
AI summary
A child safety locking mechanism has first and second movable doors, a fixed frame, first and second latching means and a catching means, the first and second latching means each comprising a retractable rod retractable by unlocking means having secondary locking means which must be unlocked before the unlocking means operates and is unlocked by a rotating, sliding or pressing-in action, the unlocking means may be released by a rotating, sliding or pressing in action, and movement direction to unlock the secondary locking means is different to the movement direction to release the unlocking means. The retractable rod includes a gear rack, and the unlocking means includes a user engaging surface and is connected by a shaft to a gear wheel engaging the gear rack to slidably move the retracting rod when the engaging surface is rotated by an adult.