Tamper-Resistant Water Meter With Rotating Register Housing
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Solution Overview
Problem
Existing water meter systems face challenges in providing adjustable and tamper-resistant configurations, which can lead to inaccurate water flow measurements and potential unauthorized modifications, affecting billing accuracy.
Innovation Solution
A meter assembly with a rotating register housing and linkage arm mechanism, secured by a retaining fastener, allows for physical adjustments and incorporates a tamper-resistant design using engagement hooks and retaining rings to prevent unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the meter components are made fixed and non-adjustable, then the tamper resistance is improved, but the ease of operation and installation flexibility deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the register housing rotatable relative to the meter housing through a retaining fastener mechanism. This allows the system to transition between fixed (when locked) and adjustable (when rotated to release) states, resolving the contradiction between tamper resistance and ease of operation.
Solution Approach 2:
The retaining fastener acts as an intermediary mechanism between the fixed meter housing and the adjustable register housing. It provides a controlled interface that allows intentional adjustment while preventing unauthorized tampering, thus resolving the contradiction between fixed security and adjustable functionality.
2Ease of operation
If the register housing is made rotatable for adjustment, then the ease of operation is improved, but the reliability against tampering deteriorates
Solution Approach 1:
The retaining fastener mechanism creates a dynamic system where rotation is permitted only under controlled conditions (intentional adjustment by authorized personnel) while maintaining security against unauthorized tampering. The mechanism transitions between locked and unlocked states based on rotational input.
Solution Approach 2:
The retaining fastener mechanism employs asymmetric design where rotation in one direction releases the lock while rotation in the opposite direction or without proper rotational input maintains security. This asymmetric behavior allows adjustment functionality while preventing tampering.
3Reliability
If a retaining fastener mechanism is added for tamper detection, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The retaining fastener mechanism is designed to be self-indicating, where the state of the fastener (locked or released) automatically provides tamper detection information without requiring additional sensors or complex detection systems. The mechanism serves itself by providing both the locking function and the detection function.
Solution Approach 2:
The patent merges the retaining/fastening function with the tamper detection function into a single integrated mechanism. The retaining fastener simultaneously secures the register housing and provides visual indication of tamper status, reducing overall device complexity while maintaining reliability.
Data Source
AI summary
A meter assembly includes: a meter housing including a top portion, the top portion including a mounting boss, the mounting boss including an engagement hook and protruding axially from a top surface of the top portion of the first housing; a register housing connected to the top portion of the first housing and configured to rotate with respect to the first housing about a rotation axis; and a retaining fastener connecting the second housing to the first housing, the retaining fastener including a one of a hook and a flange configured to engage the mounting boss and a one of a hook and a flange configured to engage the second housing.