Two-Stage Valve Actuation Safety Latch for Foot Pedals
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Solution Overview
Problem
Operators of foot-operated waterblasting devices often lose balance and inadvertently actuate the valve, leading to accidental high-pressure fluid buildup due to the lack of support structures for grasping or leaning during operation.
Innovation Solution
A two-stage valve actuation system featuring a safety latch that covers the actuation lever, requiring a deliberate two-step process to prevent accidental operation, including a first stage where the safety latch is lifted to expose the actuation lever and a second stage where the lever is operated to actuate the valve assembly, with a biasing member returning the system to the initial position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a foot-operated valve assembly is used for waterblasting devices, then the valve can be easily actuated by simply depressing the pedal, but operators can inadvertently step on the foot pedal and accidentally actuate the valve, leading to high-pressure fluid buildup
Solution Approach 1:
The valve actuation process is segmented into two distinct stages: first lifting the safety latch, then depressing the actuation lever. This segmentation prevents accidental single-stage activation while maintaining operational simplicity when the two-stage process is deliberately followed
Solution Approach 2:
The safety latch must be lifted in advance before the actuation lever can be depressed. This preliminary action ensures that operators consciously prepare for valve activation, preventing inadvertent triggering while maintaining ease of operation through the structured two-step process
2Reliability
If a safety latch is added to cover the actuation lever and prevent inadvertent operation, then accidental valve activation is prevented, but the device complexity increases with additional components
Solution Approach 1:
The safety latch and actuation lever are merged into a single integrated assembly where the latch is pivotally connected to the lever itself. This combining reduces the number of separate components and simplifies the overall structure while maintaining the two-stage safety mechanism
Solution Approach 2:
The actuation lever serves multiple functions: it acts as both the safety latch (when in the upper position) and the valve actuator (when depressed). This multi-functionality eliminates the need for separate safety and actuation components, reducing device complexity while maintaining reliability
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 accidental activation of the valve, ensuring operators can safely operate the device by requiring intentional action to engage the valve, thereby reducing the risk of accidental high-pressure fluid buildup and improving operational safety.
Implementation Method 1
The biasing member is engaged between the actuation lever and the safety latch and configured to bias the actuation lever to the first lever position and the safety latch to the first latch position
Data Source
AI summary
A two-stage valve system includes a safety latch configured to at least partially cover an actuation lever, such as a foot pedal, to prevent inadvertent operation of the actuation lever. The safety latch needs to be lifted to a certain level to gain access to the actuation lever in a first stage, and then the actuation lever is operated to actuate a valve assembly in a second stage.