Adjustable Resistance Weight Sled with Bias Correction
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Solution Overview
Problem
Existing weight sleds for fitness training lack control over resistance, direction, and feedback, and fail to prevent wheel skid or slippage during use.
Innovation Solution
A weight sled with multiple resistance mechanisms, including permanent magnets and electromagnetic coils, that provide adjustable resistance electronically, allowing for fine-grained control over resistance and direction, and includes sensors to monitor angular velocity and adjust resistance to prevent wheel skid, using a control unit to calculate performance metrics and display feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic resistance mechanisms are used, then resistance control precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical friction-based resistance mechanisms with electromagnetic resistance mechanisms. The electromagnetic mechanism uses a magnetic field generated by an electromagnetic coil to provide resistance force, enabling precise electronic control of resistance levels without the complexity of mechanical adjustment mechanisms. This substitution achieves fine-grained resistance control while maintaining relatively simple device structure.
2Reliability
If wheel skid control through electronic monitoring is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements wheel skid control through electronic monitoring of wheel angular velocity. Sensors detect the rotational speed of each wheel, and this information is fed back to a control system that adjusts the electromagnetic resistance on individual wheels to prevent skidding. This feedback mechanism ensures reliable wheel traction while using simple sensor and control circuitry.
3Ease of operation
If bias correction through differential resistance adjustment is used, then directional control is improved, but device complexity increases
Solution Approach 1:
The patent applies differential resistance adjustment by independently controlling the electromagnetic resistance on each wheel based on its local conditions. The control system monitors the motion state of each wheel and applies different resistance levels to different wheels to correct directional bias and maintain straight-line motion. This localized control approach achieves precise directional control while keeping the overall device structure simple.
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 weight sled provides precise control over resistance and direction, reduces wheel skid, and offers quantitative feedback on user performance, enhancing the effectiveness of fitness training by allowing for variable resistance and directional adjustments.
Implementation Method 1
at least one of the plurality of resistance mechanisms comprises a permanent magnet and an electromagnetic coil, and provides resistance via back electromotive force when operated with a completed circuit in the electromagnetic coil
Data Source
AI summary
A weight sled for fitness training that uses a plurality of resistance mechanisms to allow for adjustment of resistance. Depending on the configuration, wheel skid or slippage control may be provided by electronic monitoring of the angular velocity of one or more wheels and electronic adjustment of the resistance of any skidding or slipping wheels, bias correction and directional control may be provided by using a plurality of resistance mechanisms via differential adjustment of the resistance of the plurality of resistance mechanisms, and differential adjustment of the resistance mechanisms may be used to manually or automatically offset a directional bias in the sled, ground surface, or the athlete's abilities to keep the sled moving in a linear motion, and to prevent wheel skid on surfaces with differing friction coefficients.