Child Resistant Pail Lid Locking Mechanism
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Solution Overview
Problem
Existing hinged lid pails lack child-resistant locking mechanisms, allowing children under four years old to easily open them, posing a safety risk.
Innovation Solution
A child-resistant locking mechanism is introduced, where a first locking mechanism on the lid cooperates with a second mechanism on the pail, requiring a downward push to disengage the lock, utilizing resilient members to bias the lid into a locked position, preventing children from opening the pail by pulling the lip or tab outwardly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple hinged lid is used, then the ease of operation is improved, but the child safety is worsened
Solution Approach 1:
The patent inverts the conventional lid opening mechanism by requiring a downward pushing motion rather than an upward pulling motion. The ramp structure converts the downward force on the tab into an outward motion that disengages the locking mechanism, making it intuitive for adults while preventing children from opening the lid by simple pulling.
Solution Approach 2:
The patent changes the operational parameter from a simple pull motion to a push-down motion that activates a ramp mechanism. This parameter change in the opening action creates a cognitive barrier for children while maintaining ease of use for adults who understand the push-to-open mechanism.
2Object-affected harmful factors
If a locking mechanism is added to prevent child access, then the child safety is improved, but the device complexity is worsened
Solution Approach 1:
The patent merges the locking mechanism with the hinge assembly, integrating the lock body, ramp, and tab into the existing lid structure. The locking function is combined with the hinge's natural movement, eliminating the need for separate locking components and reducing overall device complexity.
Solution Approach 2:
The hinge assembly serves multiple functions: it allows the lid to open and close, provides the locking mechanism through the ramp and tab interaction, and enables child-resistant operation. This multi-functionality reduces the need for additional components and simplifies the overall structure.
3Reliability
If a resilient member is used to bias the lid locked, then the reliability of locking is improved, but the device complexity is worsened
Solution Approach 1:
The resilient member automatically biases the lid into the locked position without requiring external intervention. The spring-loaded tab continuously exerts force to maintain engagement with the ramp, providing self-sustaining locking action that ensures reliable engagement while using a simple elastic component.
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 mechanism effectively prevents children from opening the pail by requiring an understanding of the need to push the lid down to disengage the lock, making it child-resistant and safe for use by those over four years old.
Implementation Method 1
a bottom surface of the lid can be provided with at least one resilient member which may contact an upper surface of the container (or a base of a lid assembly) (or visa versa) to resiliently bias the lid into locking the engagement with the pail
Data Source
AI summary
An improved lid and pail combination provides a child resistant connection for use with pails.