Adjustable Dumbbell Weight Sensor via Rotational Indexing
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Solution Overview
Problem
Traditional dumbbells require multiple weights for varied exercises, making them inconvenient to use as users need to frequently switch between different weights, and existing adjustable dumbbells have limitations in weight range and increment due to length and weight constraints.
Innovation Solution
An adjustable dumbbell system with a handle assembly, rotatable sleeve, indexing wheel, weight sensors, and a computing device that detects the rotational position of the indexing wheel to determine the combination of weights connected, allowing precise weight selection without physical weight changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional dumbbells are used with multiple weights, then weight variety is achieved, but convenience deteriorates due to frequent switching between different weights
Solution Approach 1:
Multiple weight options are merged into a single adjustable dumbbell unit. The system combines a handle assembly with a rotatable sleeve that can select different weight combinations from a shared weight pool, eliminating the need for multiple separate dumbbells while maintaining weight variety.
Solution Approach 2:
The adjustable dumbbell system provides multi-functionality by enabling a single device to perform the role of multiple fixed-weight dumbbells. The rotatable sleeve mechanism allows one dumbbell to universally provide various weight selections through different rotational positions, improving convenience while maintaining adaptability.
2Measurement precision
If adjustable dumbbells are designed for lighter weights, then weight increment precision is improved, but weight range deteriorates
Solution Approach 1:
The weight selection mechanism is segmented into multiple discrete rotational positions on the sleeve, each corresponding to a specific weight combination. This segmentation allows for precise weight increments while maintaining a broad weight range through the cumulative effect of multiple segmented positions.
Solution Approach 2:
The system transitions from a single-dimension weight selection (light vs. heavy) to a multi-dimensional selection space through the rotatable sleeve with multiple positional settings. This dimensional expansion enables both fine weight increments and broad weight range coverage within a single adjustable unit.
3Adaptability or versatility
If adjustable dumbbells are designed for heavier weights, then weight range is improved, but weight increment precision deteriorates
Solution Approach 1:
The weight selection system is made dynamic through the rotatable sleeve mechanism, which can be rotated to different positions to change weight combinations. This dynamic adjustment capability allows the system to provide both heavy weight range and precise increments by simply changing the rotational position rather than requiring separate dumbbells for each weight level.
4Measurement precision
If a sensor system is added to detect sleeve position, then weight determination accuracy is improved, but device complexity increases
Solution Approach 1:
The mechanical weight determination system is supplemented or replaced with a sensor-based detection system. Instead of relying solely on mechanical indicators, electronic sensors detect the rotational position of the sleeve to determine the selected weight combination, improving accuracy while the modular sensor integration minimizes added complexity.
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 users to easily select and adjust weights within a wide range without physically changing dumbbells, enhancing exercise flexibility and convenience by determining the weight combination based on the indexing wheel's position, thus overcoming traditional dumbbell limitations.
Implementation Method 1
The at least one sensor may include a magnetic sensing portion positioned adjacent to the magnet, the magnetic sensing portion configured to detect the direction of the magnetic field of the magnet. The at least one sensor may detect the rotational position of the indexing wheel based on the detected direction of the magnetic field of the magnet.
Data Source
AI summary
An adjustable dumbbell system having a weight sensor is provided. The adjustable dumbbell system may include a handle assembly, a plurality of weights selectively fixedly connectable to the handle assembly, a sleeve rotatably coupled to the handle assembly, an indexing wheel rotatably coupled to the handle assembly and arranged to rotate with the sleeve, at least one sensor configured to detect the rotational position of the indexing wheel, and a computing device in communication with the at least one sensor. The rotational position of the sleeve may correspond to a different combination of the plurality of weights fixedly connected to the handle assembly. The computing device may be configured to determine the different combination of the plurality of weights fixedly connected to the handle assembly based on the rotational position of the indexing wheel detected by the at least one sensor.