Interchangeable Spring Child Safety Latch Mechanism
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Solution Overview
Problem
Current child safety door latch products are aesthetically undesirable and do not effectively differentiate between the thumb strengths of various age groups, failing to provide secure yet attractive solutions for home safety.
Innovation Solution
A built-in child safety door latch system featuring interchangeable compression springs with varying tensions proportional to thumb strengths, allowing for selection based on age groups, and incorporating a pair of handles, pushbuttons, connectors, and a latch mechanism that requires simultaneous force application to open the door, ensuring security while maintaining an attractive appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional door knob covers and locks are used, then child safety is improved, but aesthetic appearance deteriorates
Solution Approach 1:
The door handle is divided into separate components: a decorative outer handle and an inner shaft button mechanism. This segmentation allows the outer handle to maintain aesthetic appeal while the inner mechanism provides safety functionality, resolving the contradiction between appearance and safety.
Solution Approach 2:
The patent introduces an intermediary mechanism (the inner shaft button with compression spring) that mediates between the decorative outer handle and the latch mechanism. This intermediary provides the safety function without compromising the aesthetic appearance of the outer handle.
2Adaptability or versatility
If a fixed tension spring is used, then the device structure is simple, but adaptability to different age groups deteriorates
Solution Approach 1:
The patent implements a dynamic system where the compression spring tension can be adjusted or changed based on the user's age group. The inner shaft button is designed to accommodate different spring tensions, allowing the same basic mechanism to adapt to varying thumb strengths of different age groups.
Solution Approach 2:
The patent changes the physical parameter of spring tension to adapt to different age groups. By providing interchangeable compression springs with different tensions, the system can be customized for children of various ages, from toddlers with weaker thumb strength to older children with stronger thumbs.
3Reliability
If high tension spring is used, then security against younger children is improved, but ease of operation by adults deteriorates
Solution Approach 1:
The patent allows changing the spring tension parameter to match the user's age group. For adult use, a lower tension spring is selected that requires minimal force to operate, while for younger children, a higher tension spring provides adequate security. This parameter adjustment resolves the contradiction between security and ease of operation.
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 system effectively restricts access by younger children while allowing older children and adults to open the door, providing enhanced safety and aesthetic appeal by using interchangeable springs that adjust to increasing thumb strength with age.
Implementation Method 1
A child safety door latch system includes a set of interchangeable pushbutton compression springs, including compression springs of varying tensions
Data Source
AI summary
A child safety door latch system includes interchangeable pushbutton compression springs of varying tensions proportional to selected values of thumb opposition strength. A pair is selected for a predetermined age group. A pair of handles each contain one of the selected pair of compression springs and a pushbutton. A latch includes a latch compression spring and a latch slider. A master connector is coupled to the latch slider. In a locked mode, the selected pair of compression springs cooperate with the latch compression spring such that the latch protrudes from the latch sleeve, holding the door locked.