Elastic Cord Door Hinge Assembly for Toy Safety
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Solution Overview
Problem
Conventional door hinge assemblies in children's toys pose choking, aspiration, or ingestion hazards due to small parts that can detach during use, and lack durability against mechanical impact from children, violating safety regulations for toys intended for children under three years old.
Innovation Solution
A door hinge assembly utilizing an elastic cord that connects the door to the door frame through hinge passages and recesses, providing a secure and impact-resistant mechanism without small detachable parts, designed to withstand mechanical stress and comply with safety standards for children under three years old.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional door hinge assemblies are used in children's toys, then the door can function properly, but small parts may detach during use creating choking hazards
Solution Approach 1:
The patent removes the traditional hinge mechanism entirely and replaces it with an elastic cord system. The cord passes through passages in the door and frame, eliminating small detachable hinge parts that could pose choking hazards while maintaining door functionality through elastic tension rather than mechanical joints
Solution Approach 2:
The patent substitutes the mechanical hinge system with an elastic cord-based suspension system. Instead of mechanical joints and pins, the door is held and moved via elastic tension from the cord, replacing potentially hazardous mechanical small parts with a continuous flexible element
2Reliability
If conventional door hinge assemblies are used, then the door can be opened and closed, but the assembly lacks durability against mechanical impact from children
Solution Approach 1:
The elastic cord inherently provides cushioning against impact forces. When the door is struck or dropped, the elastic material absorbs and dissipates impact energy through deformation, preventing the rigid failure that would occur with conventional hinges under similar impact conditions
Solution Approach 2:
The patent changes the mechanical parameters of the door suspension system by using an elastic cord with specific tension and stretch characteristics. This allows the system to dynamically adjust to impact forces, providing both operational flexibility and impact durability that rigid hinge assemblies cannot achieve
3Object-affected harmful factors
If an elastic cord hinge assembly is implemented, then safety is improved by eliminating small parts, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the elastic cord itself: it serves as the suspension element, the hinge replacement, the impact absorber, and the door positioner. This consolidation reduces the number of separate components needed compared to traditional hinge assemblies with multiple small parts
Solution Approach 2:
The elastic cord performs multiple functions simultaneously: it allows door movement, provides impact protection, maintains door position, and eliminates choking hazards. This multi-functionality compensates for the increased complexity by reducing the total component count and assembly steps
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 elastic cord hinge assembly prevents disconnection during impact, ensures safety by eliminating small parts that can be ingested, and meets regulatory standards for safety, allowing the door to function reliably and securely in toys for young children.
Implementation Method 1
The elastic cord connects the door to the door frame through hinge passages and recesses, providing a secure and impact-resistant mechanism without small detachable parts
Implementation Method 2
The elastic cord facilitates a pivotal motion of the door about a hinge axis
Data Source
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AI summary
A door hinge assembly includes: a door frame defining a frame opening and a jamb at one side of the frame opening, the jamb including two frame corners protruding into the frame opening and a jamb brace connecting the two frame corners across the frame opening, the jamb brace defining two spaced-apart hinge holes therethrough; a door movable to selectively provide access through the frame opening, and an elastic cord connecting the door to the door frame, the cord extending sequentially through a first of the two hinge passages, through a first of two passage openings at the jamb edge, through a first of the two hinge holes, across the jamb brace, through a second of the two hinge holes, through a second of the two passage openings at the jamb edge, and through the second of the two hinge passages.