Weight-Adjustable Kettlebell Selector Mechanism
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Solution Overview
Problem
Conventional dumbbells have fixed weights, leading to waste and increased space and cost for users and manufacturers due to the need for multiple weights to accommodate varying user abilities, and they cannot be easily adjusted for different users.
Innovation Solution
A weight-adjustable kettle-shaped dumbbell design featuring a selector unit that allows for the attachment or detachment of weight pieces via a cable system, enabling users to adjust the weight by rotating an operating member to move cable terminals along tracks, engaging or disengaging selection boards to secure the desired weight pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple fixed-weight dumbbells are provided to accommodate different user needs, then user adaptability is improved, but storage space and cost increase
Solution Approach 1:
The dumbbell is divided into a fixed body and detachable weight pieces. The weight pieces can be selectively attached or detached to change the total weight, allowing one dumbbell to serve multiple weight requirements instead of needing multiple separate dumbbells.
Solution Approach 2:
The dumbbell weight is made dynamic and adjustable rather than fixed. The selector unit with cable members enables the weight configuration to be changed on demand, transforming a static object into a dynamically adaptable one that can adjust to different user needs.
2Adaptability or versatility
If multiple fixed-weight dumbbells are provided for different users, then user-specific weight requirements are met, but device quantity and cost increase
Solution Approach 1:
A single dumbbell body is designed to perform multiple functions by accommodating different combinations of weight pieces. This universal design allows one dumbbell to replace multiple fixed-weight dumbbells, serving different users with different weight requirements without needing to manufacture or store multiple separate devices.
Solution Approach 2:
The weight parameter of the dumbbell is made changeable through the selector unit mechanism. By adjusting which weight pieces are attached, the total weight parameter can be modified to match different user requirements, eliminating the need for multiple dumbbells with fixed different weight parameters.
3Ease of manufacture
If conventional fixed-weight dumbbells are used, then manufacturing and structure are simple, but weight adjustability is lost
Solution Approach 1:
The dumbbell is segmented into a main body and separate weight pieces connected through a selector unit. This segmentation allows the weight components to be manufactured independently and assembled later, maintaining manufacturing simplicity while enabling weight adjustability through the modular design.
4Adaptability or versatility
If weight pieces are made detachable for adjustment, then weight adaptability is improved, but device complexity increases
Solution Approach 1:
The cable members act as intermediaries between the selector unit and the weight pieces. They transmit the selecting force from the operating member to the selection boards, which then engage or disengage the weight pieces. This intermediary mechanism enables weight adjustment while keeping the overall structure manageable through functional decomposition.
Data Source
AI summary
A weight-adjustable kettle-shaped dumbbell includes a body. The inner bottom of the body is hollow. With a selector unit, the body is able to hang a desired number of weight pieces for changing the weight of the dumbbell. The selector unit links a cable member to move upward or downward with an operating member for changing the inner and outer positions of specific selection boards in the body so as to attach relative weight pieces to the body. The kettle-shaped dumbbell of the present invention is adjustable in weight for the user's demand.