Adjustable Dumbbell Telescopic Bar and Gear Mechanism
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Solution Overview
Problem
Existing dumbbells either have unadjustable weights, requiring multiple purchases as strength increases, or have cumbersome adjustment mechanisms that are troublesome to operate.
Innovation Solution
An adjustable dumbbell design featuring a telescopic dumbbell bar with linear adjusting mechanisms and counterweight mechanisms, allowing for rapid and secure length and weight adjustments using a gear adjusting assembly and limiting assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dumbbells use detachable weight plates connected by bolts, then weight adjustability is improved, but operation complexity increases
Solution Approach 1:
The patent combines the weight plates and adjustment mechanism into an integrated counterweight mechanism that rotates directly on the dumbbell bar axis. This merging eliminates the need for separate bolt connections and multiple weight plate handling operations, allowing users to adjust weight by simply rotating a single mechanism while maintaining both adjustability and ease of operation.
Solution Approach 2:
The counterweight mechanism serves multiple functions: it provides adjustable weight, maintains counterbalancing, and enables rapid weight changes through a single rotational operation. This multi-functionality consolidates what would otherwise require separate components (weight plates, bolts, adjustment mechanisms) into one unified system that improves both adaptability and ease of operation.
2Adaptability or versatility
If multiple sets of dumbbells are purchased for different weight levels, then weight coverage is improved, but cost and occupied space increase
Solution Approach 1:
The patent implements a dynamic weight adjustment system where the counterweight mechanism can be rotated to change the effective weight of the dumbbell during use. This dynamic adjustability allows a single dumbbell to provide multiple weight levels (e.g., 5kg, 10kg, 15kg) by rotating the counterweight, eliminating the need to purchase and store multiple static dumbbell sets for different weight levels.
Solution Approach 2:
The counterweight mechanism is segmented into adjustable weight components that can be independently positioned along the rotation axis. This segmentation allows the weight to be divided into discrete adjustable levels while maintaining a single integrated structure, providing the functionality of multiple dumbbell sets within one device.
3Length of moving object
If dumbbell bar length is adjusted by moving weight plates, then length adjustability is improved, but operational trouble increases
Solution Approach 1:
The patent merges the length adjustment function with the weight adjustment function by using the same rotational counterweight mechanism. When the counterweight is rotated, it simultaneously adjusts both the effective weight and the position of the counterweight along the bar, providing a single operational action that accomplishes both length and weight adjustment without the operational troubles of separate adjustment mechanisms.
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 adjustable dumbbell enables convenient and efficient adjustment of both length and weight, reducing the need for multiple dumbbell sets and simplifying the adjustment process, thus improving user experience and reducing costs and space requirements.
Implementation Method 1
said planetary gear structure comprises two planetary gear carriers, a planetary gear and an internal helical gear, and the planetary gear and the internal helical gear are disposed between the two planetary gear carriers
Implementation Method 2
an outside of each of said telescopic mandrels is provided with an external thread extending along an axial direction of the telescopic mandrel
Implementation Method 3
The limiting assembly is configured to limit the gear adjusting assembly. Said limiting assembly includes a U-shaped fixed block and a locking pin
Implementation Method 4
two telescopic mandrels disposed in the sleeve and in sliding fit with each other
Data Source
AI summary
An adjustable dumbbell includes a dumbbell bar, linear adjusting mechanisms and counterweight mechanisms disposed at both ends of the dumbbell bar. The dumbbell bar includes a sleeve and two telescopic mandrels disposed in the sleeve and in sliding fit with each other, the counterweight mechanisms are coaxially disposed at both ends of the dumbbell bar, and configured to provide the overall weight of the adjustable dumbbell. Each linear adjusting mechanism includes a limiting assembly and a gear adjusting assembly. The gear adjusting assembly is configured to allow the two telescopic mandrels to be close to or away from each other, so as to control the overall combination length of the two telescopic mandrels. The limiting assembly is configured to limit the gear adjusting assembly.