Motorized Fish Tape Reel With Snag-Safe Retraction Control
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Solution Overview
Problem
Existing fish tape tools face challenges in efficiently dispensing and retracting fish tape through conduits without buckling or distortion, and in managing entanglement or snagging during the retraction process, which can damage the tool and cause operational inefficiencies.
Innovation Solution
A fish tape assembly with a motor-driven output reel and a rotatable drum that allows for bidirectional rotation, enabling controlled dispensing and retraction of fish tape, along with a clutch mechanism and hall effect sensor for monitoring and preventing excessive power application, and a manual cranking option for overcoming cogging torque and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor-driven fish tape tool is used to dispense and retract fish tape through conduits, then productivity and power are improved, but the fish tape may buckle or distort under varying resistance conditions
Solution Approach 1:
The system dynamically switches between motor-driven operation and manual cranking based on operational conditions. The motor provides high-speed dispensing and retraction when conditions permit, while the manual crank engages when excessive resistance is detected, allowing the system to adapt to varying conduit conditions and prevent fish tape buckling or distortion.
Solution Approach 2:
The system changes the driving parameter from motor power to manual mechanical input when resistance exceeds thresholds. This parameter change allows operators to maintain control over the force applied to the fish tape, preventing buckling under high resistance while achieving high productivity when conditions are favorable.
2Speed
If excessive power is applied during retraction, then retraction speed is improved, but the fish tape may become entangled or snagged
Solution Approach 1:
The system incorporates feedback mechanisms (Hall effect sensors, current monitoring) that detect conditions indicating potential entanglement or snagging. When abnormal conditions are detected, the system automatically reduces power or switches to manual operation, preventing damage while maintaining efficient retraction under normal conditions.
Solution Approach 2:
The system prepares for potential problems by implementing protective measures before damage occurs. The clutch mechanism and manual crank option serve as cushioning elements that engage before excessive force can cause entanglement or snagging, protecting the fish tape and tool.
3Reliability
If a clutch mechanism and sensors are added to prevent excessive power application, then reliability is improved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical protection mechanisms with simpler electronic control and sensing. Hall effect sensors and motor current monitoring provide feedback that triggers protective actions, reducing mechanical complexity while maintaining or improving reliability compared to purely mechanical solutions.
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 ensures smooth and efficient dispensing and retraction of fish tape, reduces the risk of damage during retraction, and enhances operational control, allowing for reliable use in various conduit conditions.
Implementation Method 1
hall effect sensor for monitoring and preventing excessive power application
Data Source
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AI summary
A fish tape tool includes a housing, a chamber defined in the housing, and a motor supported by the housing. The motor is configured to rotate in a first direction and a second direction that is opposite the first direction. An output reel is disposed in the chamber and is rotatable in response to receiving torque from the motor. A drum contains a fish tape and including a rotatable drum portion having an inner wall that is engaged by the output reel when the drum is inserted into the chamber of the housing. When the drum portion is rotated by the output reel in the first direction, fish tape is dispensed from the drum. When the drum portion is rotated by the output reel in the second direction, fish tape is retracted into the drum.