Fish Tape Drum Torque Control for Tangle and Damage Prevention
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Solution Overview
Problem
Existing fish tape tools lack efficient mechanisms for detecting and adapting to different types of fish tape, leading to potential entanglement and damage during dispensing and retracting operations.
Innovation Solution
A fish tape assembly with a sensor to identify the type of fish tape in the drum, allowing the motor to set the appropriate torque level and include features like clutch mechanisms and manual operation to prevent damage, along with designs that minimize tangling through frame and drum configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a motor is used to rotate the fish tape drum, then the dispensing and retracting operations are automated and more efficient, but different types of fish tape require different torque levels which may cause entanglement or damage if not properly adjusted
Solution Approach 1:
A sensor detects the type of fish tape in the drum and provides feedback to a controller, which then adjusts the motor torque accordingly. This closed-loop feedback system ensures the motor applies the appropriate torque for each fish tape type, preventing entanglement and damage while maintaining automated operation efficiency.
Solution Approach 2:
The motor torque is made dynamically adjustable based on the detected fish tape type. The system transitions from fixed torque to variable torque operation, allowing the motor to adapt its output characteristics to match the specific requirements of different fish tape types, thereby preventing damage while maintaining productivity.
2Reliability
If a sensor is added to detect fish tape type, then the system can adapt torque levels to prevent damage, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical torque adjustment mechanisms with an electronic sensor-based detection and control system. The sensor identifies fish tape type and the controller electronically adjusts motor torque, which is simpler and more reliable than mechanical torque adjustment mechanisms while achieving the same damage prevention goal.
3Ease of operation
If the lead channel is offset from the central plane, then fish tape dispensing is improved, but the drum structure becomes more complex
Solution Approach 1:
The lead channel is deliberately positioned asymmetrically, offset from the central plane of the drum. This asymmetric configuration optimizes fish tape dispensing by creating a more effective feeding path, while the overall drum structure remains relatively simple, minimizing the increase in device complexity.
Data Source
AI summary
A fish tape drum may include a frame. A fish tape drum may include a drum portion rotatable relative to the frame, the drum portion having an outer wall, an inner wall, and a slot arranged between the outer wall and the inner wall. A fish tape drum may include an anchor member moveable within the slot between the outer wall and the inner wall. A fish tape drum may include a fish tape having an anchor end secured to the anchor member and a moving end opposite the anchor end, the moving end configured to move relative to the drum portion as the drum portion rotates relative to the frame.