Adjustable Dumbbell Micro-Weight Adjustment Mechanism
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Solution Overview
Problem
Conventional adjustable dumbbells lack the ability to micro-adjust the total weight, requiring weight members to be attached in pairs and not allowing for selective attachment of weights such as 1 kg or 0.5 kg to the central handle bar.
Innovation Solution
An adjustable dumbbell assembly with additional weight elements, each weighing half of the standard weight member, and a mechanism involving plates, beams, latches, and rods that allow for precise adjustment by engaging with the weight members and securing them to the handle bar through a system of grooves, passages, and slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If weight members are attached in pairs to the end portions of the central handle bar for balancing purposes, then the structural stability and balance of the dumbbell is improved, but the ability to micro-adjust the total weight is lost and weight cannot be selectively adjusted in small increments
Solution Approach 1:
The weight system is segmented into two distinct components: standard weight members (e.g., 1 kg each) that attach in pairs to the handle bar ends for balance, and additional weight elements (e.g., 0.5 kg each) that attach to blocks on the handle bar. This segmentation allows the balanced weight members to maintain stability while the additional weight elements provide fine-tuning capability, resolving the contradiction between balance and weight adjustment flexibility.
2Adaptability or versatility
If multiple weight members are provided for attaching to the end portions of the central handle bar, then the range of weight selection is improved, but the precision of weight adjustment is reduced due to the requirement of attaching in pairs
Solution Approach 1:
The weight adjustment system is divided into two levels: coarse adjustment using standard weight members (1 kg increments) that attach in pairs, and fine adjustment using additional weight elements (0.5 kg increments) that attach individually to blocks. This segmentation enables both a wide weight selection range and precise weight adjustment, as users can combine different numbers of standard weight members with additional weight elements to achieve exact desired weights.
Solution Approach 2:
The invention adds a new dimension to the weight adjustment system by introducing additional weight elements that attach to blocks along the handle bar, rather than only at the ends. This creates a third spatial dimension for weight configuration, allowing independent adjustment of weight distribution and total weight with half-kilogram precision, thereby enhancing both weight selection range and adjustment precision.
3Stability of the object's composition
If weight members are required to be attached in pair to the end portions of the central handle bar, then the balancing function is improved, but the ease of operation for selective weight adjustment is reduced
Solution Approach 1:
The weight adjustment operation is segmented into two independent tasks: attaching standard weight members in pairs to the handle bar ends for balanced weight selection, and attaching or removing additional weight elements to blocks for fine-tuning. This segmentation simplifies operation by allowing users to first select the base weight using standard members, then easily adjust by half-kilogram increments using additional weight elements, improving overall ease of operation while maintaining balance.
Data Source
AI summary
An adjustable dumbbell device includes a handle bar having two plates extended from end portions and two extensions, a number of weight members each having a groove and a passage, two blocks are secured to the extensions, two pairs of beams are secured between the plates and the blocks and engageable into the groove of the weight member, two latches are slidably engaged onto the extensions, two rods are secured to the latches for moving the latches relative to the beams, two catches are engaged onto the rods and biased to engage with the beams, and two weight elements are detachably attached to the blocks, the weight elements each has a weight of one half (½) of that of the weight member.