Adjustable Kettlebell Safety Mechanism
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Solution Overview
Problem
Individuals and small gyms face challenges in owning and storing multiple kettlebells due to cost and space constraints, making it difficult to access a variety of weights for exercise programs.
Innovation Solution
An adjustable kettlebell system that includes a cradle with a drive shaft rotated by a motor, a sensor toggle, and a position sensor to determine if the kettlebell is in the cradle, allowing for weight adjustments only when the kettlebell is docked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adjustable kettlebell system is implemented, then weight variety and space efficiency are improved, but the risk of inadvertent weight changes and safety issues increases
Solution Approach 1:
The dial key protrudes into the opening key to preemptively prevent rotation of the selection mechanism. This preliminary blocking action stops inadvertent weight changes before they can occur, addressing the safety concern while maintaining the adjustable weight capability.
Solution Approach 2:
The dial key acts as an intermediary element between the dial and the selection mechanism. When retracted, it allows weight adjustment; when extended, it mediates by blocking the opening key to prevent unauthorized changes, thus controlling the transition between adjustable and fixed states.
2Ease of operation
If the dial is always extended to allow weight adjustment, then ease of operation is improved, but the risk of inadvertent changes increases
Solution Approach 1:
The dial key is designed to be dynamically positionable between an extended state (blocking weight changes) and a retracted state (allowing weight changes). This dynamic positioning is controlled by the sensor toggle that detects whether the kettlebell is in the cradle, making the system adaptive to usage context.
Solution Approach 2:
The sensor toggle provides feedback about the kettlebell's position in the cradle to the control system, which then actuates the dial key accordingly. This feedback loop ensures the dial key is only retracted when the kettlebell is properly positioned, preventing inadvertent changes during exercise while enabling adjustment when docked.
3Reliability
If a sensor toggle and position sensor system is added, then safety control is improved, but device complexity increases
Solution Approach 1:
The sensor toggle automatically detects whether the kettlebell is in the cradle and triggers the appropriate action (extending or retracting the dial key) without requiring user intervention. The system serves itself by using the kettlebell's own position to control the safety mechanism, reducing the need for complex external control systems.
Solution Approach 2:
The patent replaces complex mechanical interlocking systems with a sensor-based control mechanism. Instead of using multiple mechanical switches or complex linkages to control the dial key position, a position sensor and toggle system provides a cleaner, more reliable control method with fewer moving parts.
Data Source
AI summary
An adjustable kettlebell includes a cradle safety mechanism and a kettlebell safety mechanism. The cradle safety mechanism includes a position sensor that detects whether the kettlebell is in the cradled position and prevents a motor from rotating to change the weight of the kettlebell if the kettlebell is in the uncradled position. The kettlebell safety mechanism includes a dial retractable into the handle of the kettlebell. When the dial is retracted into the kettlebell, a selection mechanism cannot be rotated to change a weight of the kettlebell.