Adjustable Dumbbell Selector Locking Mechanism
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Solution Overview
Problem
Conventional adjustable weight dumbbell assemblies face issues with weight plates becoming disengaged when dropped, leading to potential damage due to inadequate selector and locking mechanisms.
Innovation Solution
A selectable weight set apparatus with a handle assembly, adjustment assembly, and locking mechanism that includes a first locking element and multiple second locking elements, allowing for secure engagement and selection of weight plates, with a gear assembly and locking assembly that ensures the selector is fixed in locked and unlocked configurations, preventing weight plate detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional selector and locking mechanisms are used in adjustable weight dumbbells, then the device allows weight plate selection and securing, but the weight plates become disengaged when the assembly is dropped
Solution Approach 1:
The locking mechanism is divided into multiple independent locking elements (first locking element and plurality of second locking elements) that can engage with the selector at different positions. This segmentation ensures that even if one locking element fails, other elements maintain the engaged state of weight plates during dropping, thereby improving reliability while preventing detachment.
Solution Approach 2:
The locking mechanism is designed with pre-positioned locking elements that are already engaged with the selector before dropping occurs. The first locking element is configured for releasable engagement with the selector and second locking elements on the selector, creating a pre-established secure connection that prevents weight plate detachment when the assembly is dropped, rather than attempting to react to the dropping event.
2Reliability
If multiple locking elements are implemented to prevent weight plate detachment, then reliability improves, but device complexity increases
Solution Approach 1:
The locking mechanism is designed so that the first locking element and plurality of second locking elements work together as an integrated system with the selector. The same locking elements that prevent weight plate detachment during dropping also enable the selection and adjustment of weight plates during normal use. This multi-functionality improves reliability while avoiding the need for separate complex locking and selection mechanisms.
Solution Approach 2:
The first locking element and second locking elements are combined with the selector into a unified locking mechanism assembly. Rather than using separate independent locking mechanisms, the patent merges these elements to work together in coordinating the engagement and disengagement of weight plates, reducing overall device complexity while maintaining high reliability through the distributed locking element design.
Data Source
AI summary
A selectable weight set apparatus includes a handle assembly including a handle having a first end portion and a second end portion opposite the first end portion. A first weight set is adapted to be supported on the first end portion of the handle and a second weight set is adapted to be supported on the second end portion of the handle. Each of the first and second weight sets includes a plurality of weight plates. An adjustment assembly selects a number of weight plates to be retained to the handle assembly. The adjustment assembly includes at least one selector for movement relative to at least one of the first and second weight sets to engage and select the weight plates in said at least one of the first and second weight sets. A locking assembly fixes the selector relative to said at least one of the first and second weight sets.