Electric Dumbbell Weight Adjustment via Rack and Pinion
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Solution Overview
Problem
Existing dumbbells with mechanical weight adjustment structures are not user-friendly or safe, lacking precise control and ease of use.
Innovation Solution
A weight adjustment device featuring a rack and pinion mechanism driven by an electric motor, coupled with photoelectric position detection and a control system, allowing for precise adjustment of weight plates through a user interface or external device, ensuring safe and easy weight modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical weight adjustment structure is used, then the dumbbell can adjust weights, but it is not user-friendly and unsafe
Solution Approach 1:
The patent replaces the traditional mechanical weight adjustment system with an electric motor-driven system. The electric motor receives control signals to automatically adjust the rack position, eliminating the need for manual mechanical manipulation. This substitution provides precise control through electronic means, enhancing both ease of operation and safety by removing the risks associated with manual mechanical adjustment.
Solution Approach 2:
The system incorporates a control device that can automatically adjust weights based on preset programs or user input. The electric motor autonomously performs the weight adjustment by rotating the rack to the desired position, reducing human intervention and improving safety. The system serves itself by automatically returning to initial positions and managing the weight selection process without requiring manual mechanical operation from the user.
2Measurement precision
If a mechanical weight adjustment structure is used, then the dumbbell can adjust weights, but it lacks precise control
Solution Approach 1:
The patent replaces manual mechanical adjustment with an electric motor-driven system controlled by electronic signals. The control device can precisely position the rack at specific angles corresponding to different weight plates, achieving accurate weight selection. This electronic control mechanism provides superior precision compared to manual mechanical systems while maintaining ease of operation through simple button presses or programmed sequences.
Solution Approach 2:
The system incorporates position detection devices such as encoders or sensors that monitor the rack position in real-time. This feedback mechanism allows the control device to accurately determine the current weight setting and make precise adjustments to reach the desired position. The feedback loop ensures accurate weight selection and prevents positioning errors, enhancing both precision and user-friendliness.
3Reliability
If an electric motor and control system are used, then precise and safe weight adjustment is achieved, but device complexity increases
Solution Approach 1:
The control device serves multiple functions: it controls the electric motor for weight adjustment, monitors position through detection devices, stores preset weight programs, and manages the overall operation of the weight adjustment system. By consolidating these functions into a single integrated control unit, the patent reduces the number of separate components needed, thereby managing complexity while maintaining safety and precision.
Solution Approach 2:
The patent combines the electric motor, position detection devices, control circuitry, and power management into an integrated assembly within the dumbbell structure. The control device merges multiple control functions into a unified system that manages weight adjustment, position monitoring, and safety features. This consolidation approach reduces the overall structural complexity compared to having separate independent systems for each function.
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 precise and safe weight adjustment of dumbbells, allowing users to easily select the desired number of weight plates to engage, enhancing user experience and safety.
Implementation Method 1
a position detection device configured to detect positions of the rack and pinion structure and to generate position signals
Implementation Method 2
a rack and pinion structure disposed at least partially within the interior channel of the mounting tube, including a first rack and a second rack coupled to each other by a coupling pinion
Data Source
AI summary
A dumbbell with a weight adjusting mechanism, which utilizes an electric motor, a rack and pinion gear linkage driven by the motor, and photoelectric position detection assemblies, to control the movement of two racks inside the handle bar of the dumbbell. The two racks move simultaneously in opposite directions by the same distance in a precisely controlled manner based on position signals provided by the position detection assemblies. The racks extend and retract within a center channel formed by center openings of a plurality of aligned and axially engaged weight plates, so that a desired number of the weight plates will be lifted by the dumbbell handle. A control system controls the motor and communicates with a user via a user interface panel on the handle bar or an external handheld device wireless connected to the control system.