Drain Cleaner Drum Sensor for Accurate Cable Length Counting
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Solution Overview
Problem
Conventional drain cleaners lack accurate and reliable methods for determining the length of cable paid out during cleaning operations, relying on manual tracking or externally mounted sensors that can introduce debris.
Innovation Solution
A drain cleaner with an inner and outer drum forming an annular channel for the cable, featuring a sensor to detect datum features on a rotating pick-up plate, such as openings or ferrous bars, to determine cable length, and a controller to calculate the expelled cable length based on these features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional manual tracking methods with markings on cable sheath are used, then the device complexity is reduced, but the measurement precision and reliability of cable length determination deteriorates
Solution Approach 1:
The patent replaces manual mechanical tracking methods with an automated sensor-based detection system. Optical sensors detect datum features (such as reflective markers or colored bands) on the cable sheath, and a controller automatically calculates cable length based on the number of features detected. This substitution of mechanical manual tracking with optical sensing and electronic processing significantly improves measurement precision while maintaining acceptable device complexity through integration.
2Measurement precision
If externally mounted sensors are used for cable counting, then the measurement precision improves, but the reliability deteriorates due to debris introduction into the drain cleaner
Solution Approach 1:
The patent nests the sensor system within the housing structure of the drain cleaner, specifically positioning sensors to detect datum features on the cable sheath as it passes through the cable dispensing mechanism. This nested configuration allows the sensors to be integrated into the existing structure rather than externally mounted, preventing debris from entering while maintaining measurement precision through internal detection of cable position.
3Ease of operation
If manual tracking methods are used, then the ease of operation is maintained, but the productivity deteriorates due to time-consuming manual tracking and zeroing
Solution Approach 1:
The patent implements a self-service cable length measurement system where the sensor automatically detects datum features on the cable and the controller autonomously calculates and displays the cable length. This eliminates the need for operators to manually track and zero measurements, significantly improving productivity while maintaining ease of operation through automatic digital display of results. The system serves itself by automatically performing functions that previously required manual intervention.
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
Provides accurate and debris-resistant cable length measurement, reducing errors and preventing debris entry into the drain cleaner.
Implementation Method 1
The drain cleaner includes a ferrous pick-up plate. The pick-up plate rotates with the inner drum. The drain cleaner includes a sensor for detecting rotation of the ferrous pick-up plate
Implementation Method 2
A plurality of datum features rotate with the inner drum. The drain cleaner includes a sensor for detecting the passage of the datum features relative to the sensor
Data Source
AI summary
A drain cleaner includes a housing and inner and outer drums disposed in the housing. The inner drum is rotatable relative to the housing. The inner drum and the outer drum form an annular drum channel for receiving a drain cleaning cable. The inner drum defines an inner drum chamber. A drain cleaning cable is disposed within the annular drum channel. The drain cleaner includes a ferrous pick-up plate. The pick-up plate rotates with the inner drum. A sensor detects rotation of the ferrous pick-up plate.