Adjustable Blade Resistance Structure for Compact Exercise Machines
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Solution Overview
Problem
Existing exercise machines, such as rowing machines, lack the ability to adjust blade resistance by varying the degree of opening and closing of the blades, limiting the range of resistance adjustment.
Innovation Solution
A blade resistance adjustment structure that includes a rotating shaft, blade seat, blades, sliding seat, and connecting members, allowing the blades to rotate synchronously and adjust their opening and closing angle by moving the sliding seat along the shaft, thereby changing the radius of rotation and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the number of blades is increased to increase resistance, then the resistance magnitude is improved, but the overall width and occupied space increase
Solution Approach 1:
The patent applies the dynamics principle by making the blade configuration dynamic rather than static. The adjustable blade mechanism allows the number of active blades to be changed during operation, enabling resistance adjustment without permanently increasing the device's physical footprint. This resolves the contradiction by allowing high resistance (when needed) without permanently occupying more space.
Solution Approach 2:
The patent changes the parameter of blade configuration from fixed to variable. By allowing the number of blades to be adjusted, the system can optimize resistance levels without permanently increasing the occupied space. This parameter change enables the same physical structure to provide different resistance levels.
2Adaptability or versatility
If the tilting angle of blades is made adjustable to change water resistance, then the resistance adjustment capability is improved, but the device complexity increases
Solution Approach 1:
The patent changes the adjustment parameter from blade tilting angle to blade number selection. This simplifies the mechanism by eliminating complex angular adjustment systems while maintaining resistance adjustment capability through discrete blade selection. The parameter change from continuous (angle) to discrete (number) reduces mechanical complexity.
3Force
If the number of blades is increased to increase resistance, then the resistance magnitude is improved, but the structural complexity increases
Solution Approach 1:
The patent makes the blade structure dynamic by allowing selective engagement of different numbers of blades. Instead of permanently installing multiple blades that increase structural complexity, the system dynamically configures the active blade count based on resistance requirements, reducing unnecessary structural complexity.
Solution Approach 2:
The patent segments the blade system into multiple independent blade units that can be selectively engaged. This segmentation allows the resistance mechanism to provide high resistance when needed without permanently increasing structural complexity, as only the necessary number of segmented blade units are activated at any given time.
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
Enables stepless adjustment of rotational resistance and reduces the overall size of the exercise machine by incorporating a sliding seat mechanism and elastic members for stable movement and reset functionality.
Implementation Method 1
the elastic member stores a first elastic potential energy. When the adjustment force is removed or reversely applied, the elastic member releases the first elastic potential energy, and the elastic member drives the sliding seat to move in the axial direction to reset
Data Source
AI summary
A blade resistance adjustment structure and an exercise machine having the same are disclosed. The blade resistance adjustment structure includes a rotating shaft, a blade seat, a plurality of blades, a sliding seat, and a plurality of connecting members. Through an adjustment force, the radius of rotation changes along with an opening and closing angle, thereby changing the magnitude of rotational resistance.