Adjustable Dumbbell With Nested Engagement Members
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Solution Overview
Problem
Conventional adjustable dumbbells are often bulkier due to complex mechanisms, lack small weight increments, and compromise on ergonomics, making them inconvenient for users who need to adjust weights frequently for varying exercises.
Innovation Solution
An adjustable dumbbell system featuring a bar assembly with a rotatable actuator and extendable engagement members that allow selective connection and disconnection of weight elements, along with a stand for supporting idle weights, enabling precise weight adjustments without gaps between elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional adjustable dumbbell mechanisms are used, then weight adjustment capability is achieved, but the dumbbell becomes bulkier and less ergonomic
Solution Approach 1:
The engagement members are nested within the bar assembly, with each engagement member contained inside the bar structure. When retracted, they fit within the bar's internal cavity; when extended, they protrude to engage weight plates. This nesting approach allows the adjustment mechanism to be integrated into the bar without significantly increasing external dimensions, resolving the contradiction between adaptability and compact size.
Solution Approach 2:
The bar assembly is segmented into distinct functional components: the bar body, multiple extendable engagement members, and weight plates. Each engagement member operates independently to engage or disengage specific weight plates, allowing granular weight adjustment. This segmentation enables precise weight control while keeping each individual component compact, addressing both the adaptability requirement and the size constraint.
2Adaptability or versatility
If complex adjustment mechanisms are used, then weight selection flexibility is improved, but ease of operation deteriorates
Solution Approach 1:
The engagement members are designed to be dynamically extendable and retractable along the longitudinal axis of the bar. Users can easily extend an engagement member to engage a weight plate or retract it to disengage, allowing rapid weight changes without complex procedures. This dynamic design maintains operational simplicity while providing flexible weight selection across multiple plates.
3Ease of operation
If weight elements have gaps between them, then ease of loading is improved, but manufacturing precision deteriorates
Solution Approach 1:
The bar assembly features localized engagement zones at specific positions along its length, with each engagement member positioned to interact with corresponding features on weight plates. The notches and tabs are precisely positioned at these local zones to ensure accurate alignment. This localized precision approach maintains manufacturing accuracy at critical interfaces while allowing flexibility in the overall weight stacking arrangement.
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
The system provides a compact, ergonomic, and user-friendly way to adjust weights in small increments, reducing bulkiness and enhancing convenience for users by allowing precise control over the weight configuration.
Implementation Method 1
the rotatable actuator provided with internal threading configured for meshing with the external threading of the extendable engagement members such that rotation of the rotatable actuator in a first direction imparts a first linear directional movement to distally extend the extendable engagement members
Data Source
AI summary
An adjustable dumbbell comprising a bar assembly which can retain a user-selectable number of weight elements, user-selectable by actuation of sliding locking tabs. A base for supporting the bar assembly and weights while not in use is also disclosed. The bar assembly may possess notches into which the tabs of the weight plates may fit to retain weight plates in the lengthwise direction, and user-slideable tabs integral to the bar assembly which restrain selected plates to the notches by passing through the small notch and preventing transverse relative movement. With weight elements seated in the stand, and the bar assembly seated in an arrangement of weight plates, a user can select the number of weight plates connected to the bar assembly by extending or retracting the sliding lock tabs, and then lift the dumbbell from the stand carrying the desired number of plates, leaving the remaining plates in the stand.