Adjustable Dumbbell Locking Mechanism for Fast Weight Changes
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Solution Overview
Problem
Existing dumbbells have fixed weights, requiring frequent disassembly and replacement of plates to adjust weight, which is cumbersome and inconvenient for users with varying strength needs.
Innovation Solution
An adjustable dumbbell design featuring a dumbbell plate fix seat with locking pieces, a grip with a connection mechanism, and a positioning mechanism to easily control the number of connected dumbbell plates by rotating the grip, ensuring secure attachment and easy assembly/disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dumbbell plates are fixed with a simple structure, then the device complexity is reduced, but the reliability of plate attachment decreases causing plates to fall off during use
Solution Approach 1:
The patent employs a dynamic locking mechanism where locking pieces can move between locked and unlocked positions. The locking pieces are spring-loaded to automatically engage with the dumbbell plate during insertion and can be disengaged by applying force, providing both secure attachment during use and easy adjustment when needed.
Solution Approach 2:
The patent introduces locking pieces as intermediary elements between the dumbbell plate fix seat and the dumbbell plates. These locking pieces act as mediators that secure the plates to the seat, preventing them from falling off while maintaining a relatively simple overall structure.
2Reliability
If multiple locking pieces are added to secure dumbbell plates, then the reliability of plate attachment is improved, but the device complexity increases
Solution Approach 1:
The patent divides the locking function into multiple independent locking pieces distributed around the dumbbell plate fix seat. Each locking piece operates independently but contributes to the overall security of plate attachment. This segmentation allows the system to achieve high reliability through redundancy without requiring a single complex locking mechanism.
3Adaptability or versatility
If frequent disassembly and replacement of dumbbell plates is required, then the adaptability to different weight needs is improved, but the loss of time increases
Solution Approach 1:
The dynamic locking mechanism allows for quick engagement and disengagement of dumbbell plates. The spring-loaded locking pieces automatically engage when a plate is inserted and can be quickly released by applying force, significantly reducing the time required for weight adjustments compared to traditional fixed mechanisms.
Solution Approach 2:
The locking mechanism is designed to be self-actuating during the plate attachment process. When a dumbbell plate is inserted into the fix seat, the locking pieces automatically move into the locked position without requiring separate manual locking actions, thereby reducing the time and steps needed for plate replacement.
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 design allows for easy weight adjustment without the need for frequent plate replacement, providing convenience and safety by preventing plates from falling off during use.
Implementation Method 1
an elastic member is provided between an upper of the moving piece and the base; the elastic member ensures that the moving piece is not subjected to an external force, and the third pin is located in the third pin hole
Implementation Method 2
the connection mechanism includes a lead screw and a moving rod slidably connected to the lead screw
Data Source
AI summary
The present disclosure discloses an adjustable dumbbell including a base, a grip, and dumbbell plates on the grip. The base is provided with a dumbbell plate fix groove, a bottom of the dumbbell plate fix groove is provided with several locking pieces; a through hole is provided on the grip, an interior of the through hole is provided with a connection mechanism. Each dumbbell plate includes a shell and a weight stack arranged in the shell. The shell is fixedly connected with a positioning mechanism, a connection rod in the connection mechanism is moved towards both ends of the grip by rotating the grip. A movement length of the connection rod and the number of dumbbell plates of the grip are controlled to control a weight of the dumbbell. The dumbbell plates are easy to disassemble and assemble and the positioning mechanism prevents the dumbbell plates from falling off.