Measuring Gauge Irreversible Drag Pointer for Pressure Safety

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Solution Overview

Problem

Existing measuring gauges fail to irreversibly and reliably display the exceedance of a critical pressure limit, as customary drag pointers can be manipulated or are not resistant to vibrations, posing a risk to equipment safety.

Innovation Solution

A measuring gauge with a spring-loaded drag pointer that latches into a recess when the critical pressure is exceeded, ensuring the exceedance is displayed irreversibly, featuring a pivoting pointer shank and actuator system that moves the drag pointer from an idle to a fixed end position, preventing reset without manual intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a customary drag pointer is used to display pressure exceedance, then the display can be reset easily, but the display can be manipulated or is not resistant to vibrations, compromising reliability

Engineering Contradiction:

Improvereset capabilityVSAvoidresistance to manipulation and vibrations

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The pointer system is divided into two independent parts: a main pointer that moves with pressure changes and a separate drag pointer that remains stationary until triggered. The drag pointer is segmented from the main pointer mechanism, allowing it to be activated only when the main pointer reaches a specific position, thereby preventing manipulation while maintaining reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The drag pointer is pre-positioned at a specific location corresponding to the maximum admissible pressure value. Before the actual pressure exceedance occurs, the drag pointer is already in place to be triggered by the main pointer's movement, ensuring that the exceedance is captured and displayed irreversibly without requiring additional action during the critical moment.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the drag pointer is positioned to be triggered by the main pointer, then the exceedance can be displayed, but the pointer must not be resettable to ensure safety

Engineering Contradiction:

Improveirreversible display of exceedanceVSAvoidreset capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Instead of designing a resettable pointer that can be manually returned to its initial position, the invention inverts the approach by creating a pointer that automatically triggers and then remains permanently in its triggered position. The irreversibility is achieved by making the drag pointer stay engaged with the actuator after triggering, preventing any reset action.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The drag pointer functions as a single-use indicator that is designed to be triggered once and then remains in its final position permanently. Similar to a disposable element, it serves its purpose of indicating exceedance and then stays in that state, requiring complete replacement or manual intervention rather than simple resetting.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If the drag pointer is spring-loaded and latches into a recess, then the display becomes mechanically irreversible, but the device complexity increases

Engineering Contradiction:

Improvemechanically irreversible displayVSAvoidspring-loaded mechanism with latch

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The drag pointer is equipped with a spring-loaded mechanism that automatically engages and latches into a recess when triggered by the main pointer's movement. The spring provides the necessary force for the drag pointer to move and lock into position without requiring external assistance, making the irreversible indication self-acting and reducing the need for complex control systems.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention replaces complex electronic or software-based reset prevention mechanisms with a simple mechanical latching system. The drag pointer's spring-loaded design with a recess latch provides mechanical irreversibility through pure mechanical means, eliminating the need for electronic sensors, processors, or software controls to prevent resetting.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 solution provides a mechanically irreversible display of pressure exceedance, ensuring safety by preventing accidental resets and requiring manual intervention for restoration, thus ensuring continued safe operation of equipment.

Implementation Method 1

A drag pointer is spring-loaded and mounted in a pivoting manner in a bushing and can latch into a second recess when moved by the pointer.

Methodology Applied

Scientific EffectSpring mechanism: Spring

Data Source

PatentUS8800474B2Measuring gauge with additional indicator for overloads

Publication Date: 2014.08.12 WIKA ALEXANDER WIEGAND SE & CO KG

AI summary

A measuring gauge used for measuring and analyzing a physical value includes a measuring element for capturing the physical value, whereby the measuring element moves according to the physical value, a movement that moves a pointer in relation to the motion of the measuring element in a pointer plane around an axis of rotation of the pointer, whereby an additional indicator irreversibly displays the excess beyond a threshold value.