Manual Pump Button Locking Mechanism Against Accidental Pressing
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Solution Overview
Problem
Manual pumps in household appliances like irons are prone to involuntary activation due to exposed buttons, leading to unintended fluid ejection and staining during use.
Innovation Solution
A stopping mechanism that requires greater force to activate the button when it is in the resting position, utilizing an elastic ring or spiral spring to immobilize the piston, creating a 'hard point' that prevents accidental activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the activation button is positioned close to the handle for ergonomic use, then ease of operation is improved, but the button becomes exposed and prone to involuntary activation
Solution Approach 1:
The stopping mechanism applies a preliminary counteracting force to the button in its resting position, creating a force barrier that prevents involuntary activation. The elastic ring exerts a stopping force that must be overcome before the button can activate the pump, thereby preemptively blocking accidental operations while preserving intentional ones.
Solution Approach 2:
The force required to activate the button is changed dynamically based on its position. The stopping mechanism modifies the activation threshold by applying additional force at the resting position, creating a variable resistance profile that distinguishes between accidental touches and deliberate activation attempts.
2Reliability
If a stopping mechanism is added to prevent involuntary activation, then reliability is improved, but device complexity increases
Solution Approach 1:
The stopping mechanism is merged with the existing pump structure by integrating the elastic ring into the button assembly. The locking component utilizes the existing groove in the piston shaft, and the support mechanism is incorporated into the pump body, thereby adding the stopping function without requiring entirely separate components.
Solution Approach 2:
The elastic ring provides self-regulating stopping force that automatically engages and disengages based on button position. The mechanism requires no external control or additional energy input, as the elastic properties of the ring naturally create the stopping force needed to prevent involuntary activation while allowing intentional activation.
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
Prevents involuntary activation of the pump, reducing the likelihood of fluid ejection and fabric staining by ensuring the button is more difficult to depress unintentionally.
Implementation Method 1
the locking component consists of an elastic ring, the ring being immobilized along the longitudinal axis of the piston by a support mechanism
Implementation Method 2
the spring is a spiral spring with one folded end that slides into the groove when the piston is in the resting position
Data Source
AI summary
Manual pump for a household appliance such as an iron, with an activation button that moves between a resting position, to which it is returned by a return mechanism, and a depressed position, into which it is moved by pressing the button to produce a pumping effect, characterized in that said pump has a stopping mechanism exerting a force against the movement of the button toward the depressed position when said button is in the resting position, said stopping mechanism being adjusted so that the force necessary to move the button into the depressed position is greater when the button is in the resting position than when it is not in said resting position.