Pump dispenser head with increased unlocking torque
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Solution Overview
Problem
Pump dispenser locking mechanisms can become loosened during e-commerce shipments, leading to product leakage due to less rugged packaging, which existing designs fail to adequately prevent.
Innovation Solution
A dispenser assembly with a rotatable dispenser head featuring a locking rib and a flexible locking ramp that requires different torques to lock and unlock, increasing the unlocking torque to prevent accidental opening and minimize leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple locking mechanism is used, then the device complexity is reduced, but the reliability of preventing product leakage during shipment deteriorates
Solution Approach 1:
The locking ramp is designed with an asymmetric profile where one side is steep and the other is gradual. This asymmetry creates different torque requirements for locking versus unlocking, making it easier to lock during assembly but requiring significantly higher torque to accidentally unlock during shipment, thereby improving reliability without adding complex components
Solution Approach 2:
The locking ramp utilizes elastic deformation as a parameter change mechanism. When the dispenser head is rotated into the locked position, the ramp flexes elastically to engage the locking rib. This elastic parameter change allows the mechanism to maintain a secure locked state while requiring a specific torque threshold to overcome the elastic resistance and unlock, preventing accidental leakage
2Reliability
If the unlocking torque is increased to prevent accidental opening, then the reliability of preventing product leakage is improved, but the ease of operation deteriorates
Solution Approach 1:
The asymmetric locking ramp profile creates a torque differential between locking and unlocking operations. The gradual side of the ramp allows controlled unlocking when intentional force is applied, while the steep side provides high resistance to accidental unlocking, thus maintaining ease of operation for intended use while ensuring reliability during shipment
Solution Approach 2:
The locking mechanism transitions from a static engagement to a dynamic elastic engagement. The locking ramp flexes during both locking and unlocking operations, creating a dynamic system where the torque requirement varies based on the direction of rotation. This dynamic behavior allows for easier intentional unlocking while maintaining high security against accidental opening
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 increased unlocking torque effectively prevents product leakage during shipments by ensuring the dispenser head remains securely locked until intentionally unlocked, even in less rugged packaging conditions.
Implementation Method 1
a distal end extending above the top wall and free to flex with respect to the top wall
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A pump dispenser head has a lockdown feature to prevent unintended dispensing during shipment. Releasing the lockdown feature requires increased torque compared with typical dispensers, allowing the dispenser to be shipped with less packaging while still preventing leakage of the contents.