Rotating Weight Selector for Adjustable Dumbbell
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Solution Overview
Problem
Existing adjustable weight exercise devices for dumbbells lack an efficient method to select and combine different weight resistances, limiting user flexibility and effectiveness in workouts.
Innovation Solution
A dumbbell system with rotatably mounted weight selectors that engage with notched weight plates, allowing users to adjust weight resistance by rotating the selectors into different sectors of a cylindrical cavity, securely attaching desired amounts of mass to the handlebar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional adjustable weight devices are used, then weight adjustment capability is provided, but the complexity of selecting and combining different weight resistances increases
Solution Approach 1:
The weight selection mechanism is divided into multiple independent weight selectors (first weight selector, second weight selector, etc.), each responsible for selecting a specific weight increment. This segmentation allows users to independently control each weight component without complex interactions, simplifying the overall selection process while maintaining versatility.
Solution Approach 2:
The patent introduces a rotational dimension to weight selection by mounting weight selectors on rotatable shafts that rotate within cylindrical cavities defined by notched weights. This rotational movement transforms the traditional linear or manual selection process into a more intuitive rotational dial operation, reducing cognitive complexity while preserving adaptability.
2Adaptability or versatility
If multiple weight combinations are allowed, then user flexibility is improved, but the difficulty of securely attaching desired weights increases
Solution Approach 1:
The weight attachment system employs self-locking notches and selector mechanisms that automatically secure weights in place through rotational engagement. The notched cylindrical cavities and corresponding selector teeth create automatic mechanical interlocking, eliminating the need for manual fastening operations and reducing operational complexity while supporting multiple weight combinations.
Solution Approach 2:
The patent introduces intermediate selector components (weight selectors mounted on shafts) that mediate between the user's selection input and the actual weight attachment. These intermediaries translate rotational selector movement into precise weight engagement through the notched cavity system, simplifying the user interface while ensuring secure weight attachment.
3Measurement precision
If precise weight adjustment is enabled, then workout effectiveness is enhanced, but the device complexity increases
Solution Approach 1:
The precision weight adjustment is achieved by segmenting the total weight range into discrete, standardized increments (e.g., 5-pound increments). Each weight selector controls a specific increment, allowing precise weight configuration through simple additive combination of standardized segments, maintaining precision without requiring complex continuous adjustment mechanisms.
Solution Approach 2:
The patent uses rotational positioning within cylindrical cavities to achieve precise weight selection. The rotational shafts and notched cavities create precise angular positions corresponding to specific weight increments, transforming precision measurement into a rotational dimension that is both accurate and intuitively controllable.
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 adjustment of weight resistance, enhancing user flexibility and workout effectiveness by allowing various combinations of weights to be securely attached to the handlebar, improving the overall exercise experience.
Implementation Method 1
The present invention provides methods and apparatus involving the movement of mass subject to gravitational force
Data Source
AI summary
An exercise dumbbell includes a handle member and weight plates maintained in spaced relationship at opposite ends thereof. Weight selectors are rotatable into and out of engagement with different combinations of the weight plates to secure a desired amount of mass to the handle. The weight selectors occupy respective upwardly closed notches in the weights to secure the weights to the handle member. Different arrangements may be used to bias the weight selectors toward desired orientations relative to the weight plates, and/or to lock the weight selectors in desired orientations relative to the weight plates.