Adjustable Dumbbell Selector Relocation to Base
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Solution Overview
Problem
Conventional adjustable dumbbells with weight-selection selectors mounted in the handle are prone to damage when accidentally hit or dropped during exercise or delivery.
Innovation Solution
The weight-selecting selector is relocated to the holder base, featuring a scissor hook mechanism with elastic members to secure weights to the handle and a selector knob for controlling the hook positions, ensuring the selector remains protected during use and transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the weight-selection selector is mounted in the handle of the dumbbell, then the selector is easily accessible during exercise, but the selector is prone to damage when the dumbbell is hit or dropped
Solution Approach 1:
The selector mechanism is extracted from the handle and relocated to the holder base. The control units remain in the holder base while actuation units are attached to the weights, separating the selector from the movable handle portion that is susceptible to impact damage during exercise or delivery.
2Reliability
If the selector is mounted in the holder base, then the selector is protected from damage, but the selector mechanism becomes more complex
Solution Approach 1:
The selector mechanism is segmented into two functional parts: control units remaining in the holder base and actuation units attached to individual weights. This segmentation allows the selector to remain protected in the base while maintaining operational simplicity through distributed control elements.
3Reliability
If the scissor hook mechanism with elastic members is used to secure weights, then the weight securing is more reliable, but the device complexity increases
Solution Approach 1:
The elastic members in the scissor hook mechanism provide automatic self-locking functionality. When the actuation unit is released, the elastic members automatically return the hook to the locked position, securing the weight without requiring additional active control or manual intervention.
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
This design protects the selector from accidental damage, maintains the dumbbell's appearance, and allows for easy weight adjustment without compromising functionality.
Implementation Method 1
at least one elastic member adapted to hold the hook unit in the close position
Data Source
AI summary
An adjustable dumbbell system includes a handle including a grip, two hanging rods at two ends of the grip and multiple through holes at each hanging rod, multiple weights, each weight defining an elongated top slot and a bottom opening and having a scissor hook mounted therein, the scissor hook including a hook unit, an actuation unit drivable by an external force to open or close the hook unit and elastic members adapted to hold the hook unit in the close position, a holder base for accommodating the weights, and a selector including multiple control units that are attached to the bottom openings of the weights when the weights are accommodated in the holder base and a selector rotatable to move the control units in driving the actuation units of the scissor hooks of the weight to open or close the hook units of the respective scissor hooks.