Adjustable Dumbbell Clevis Pin Weight Mechanism
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Solution Overview
Problem
Existing weight adjustable dumbbells require complex and time-consuming processes for precise and balanced weight adjustments, often involving multiple steps and expensive positioning mechanisms, which limits their efficiency and convenience.
Innovation Solution
The use of a clevis pin and an ordinary screw simplifies the construction of the adjusting mechanism, allowing for simultaneous and precise adjustment of weight plates by utilizing a positioning pin that interacts with spline members and a positioning gear, enabling easy selection and locking of desired weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate adjusting mechanisms are used at both ends of the dumbbell handle, then weight adjustment is possible, but the adjustment process becomes complex and time-consuming
Solution Approach 1:
The patent combines the adjusting mechanisms of both dumbbell ends into a single integrated system. A single adjusting key with two bolts can simultaneously control weight plates at both ends, eliminating the need for separate adjustment operations and reducing overall mechanism complexity.
Solution Approach 2:
The adjusting key is designed as a universal component that performs multiple functions: it simultaneously adjusts weight plates at both ends of the handle, locks the selected weights, and provides a unified interface for the user. This multi-functional design simplifies the overall system while maintaining full adjustability.
2Ease of operation
If continuous threading is used on the thread rod for weight adjustment, then smooth weight selection is achieved, but precise weight location becomes difficult without complex positioning mechanisms
Solution Approach 1:
The patent introduces a positioning plate as an intermediary component between the continuous threading system and the weight selection requirement. The positioning plate features discrete positioning holes that guide the adjusting key to precise weight locations, while the continuous thread rod maintains smooth adjustment operation. This mediator resolves the conflict between continuous motion and discrete positioning.
3Adaptability or versatility
If separate adjustment operations are required for both ends of the dumbbell, then individual weight selection is possible, but the adjustment time increases substantially
Solution Approach 1:
The patent merges the adjustment operations for both dumbbell ends into a single simultaneous action. The adjusting key incorporates two bolts that engage with weight plates at both ends concurrently, allowing the user to select and lock weights at both ends in one motion, thereby eliminating the time loss associated with sequential adjustment.
4Ease of manufacture
If simple threading mechanisms are used for weight adjustment, then manufacturing cost is reduced, but precise and balanced weight location cannot be achieved
Solution Approach 1:
The positioning plate serves as a cost-effective intermediary that adds precision to the otherwise simple threading mechanism. By incorporating discrete positioning holes in the positioning plate, the system achieves precise weight location without requiring complex machined features on the thread rod or weight plates themselves, thus maintaining low manufacturing costs while improving precision.
Data Source
AI summary
A dumbbell apparatus which is adapted with a series of weight plates, the number of which can be safely and reliably adjusted with a single simple motion. The apparatus comprises a cradle for storing and deploying the apparatus, weight plates, and a handle apparatus which has two spline bolts which support the weight plates and are used to simultaneously be adjusted by means of an adjusting pin which moves the spline members together through a motion transmitting gear. The apparatus may be further enhance with permanent weights and gripping options.