Adjustable Barbell Pinion Lock for Secure Weight Selection
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Solution Overview
Problem
Traditional free weights, such as dumbbells and barbells, require time-consuming and potentially hazardous manual adjustments to change weight, necessitating multiple weights and user decision-making for desired resistance levels.
Innovation Solution
An adjustable barbell system with a handle assembly, weight selector assembly, and selector knob that allows for easy weight adjustment by rotating the knob to select and couple removable weights based on predetermined positions, featuring a gear assembly to convert rotation to axial movement and a pawl to prevent extension beyond a weight face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional manual weight adjustment is used, then users can change weight by selecting different free weights, but the process is time-consuming and requires user decision-making for combining plates
Solution Approach 1:
The weight selector assembly automatically couples removable weights to the handle assembly based on the rotational position of the selector knob, eliminating the need for manual plate selection and combination decisions. The system self-adjusts by mechanically engaging weights corresponding to the selected position.
Solution Approach 2:
The patent replaces the manual mechanical assembly/disassembly process with an automated mechanical selection system. Rotating the selector knob drives a rod axially to engage or disengage weights through a gear assembly, substituting user decision-making and manual handling with a automated mechanical selection mechanism.
2Ease of operation
If manual handling of weight plates is required, then users can adjust weights, but there is risk of injury from pinching fingers or dropping plates
Solution Approach 1:
The weight selector assembly performs the weight adjustment function automatically without requiring users to manually handle weight plates. The system self-couples and self-uncouples weights through the selector mechanism, eliminating exposure to pinching hazards and dropping risks.
Solution Approach 2:
The rod and gear assembly act as intermediaries between the user's rotational input and the weight coupling action. This intermediary mechanism translates simple knob rotation into controlled axial movement that safely engages or disengages weights without direct user contact with moving parts or weight plates.
3Ease of operation
If a selector mechanism is added to enable automatic weight selection, then weight adjustment becomes easier and safer, but the device complexity increases
Solution Approach 1:
The weight selector assembly is divided into distinct functional segments: the selector knob for user input, the rod for axial movement, the gear assembly for motion conversion, and the weight coupling mechanism. This segmentation allows each component to perform a specific function with simple, well-defined interactions, reducing overall system complexity despite adding automation.
4Measurement precision
If the selector mechanism uses a gear assembly to convert rotation to axial movement, then precise weight selection is achieved, but manufacturing complexity increases
Solution Approach 1:
The gear assembly uses standard, locally-available gear components with conventional tooth profiles and dimensions. By employing common gear manufacturing standards and simple geometric relationships, the design achieves precise rotational-to-axial conversion while maintaining ease of manufacture through the use of well-established, off-the-shelf gear elements.
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
Facilitates quick and safe weight adjustments without manual handling, ensuring secure coupling and decoupling of weights, reducing injury risk and enhancing user convenience.
Implementation Method 1
The gear assembly may include a main bevel gear fixed to the selector ring, a rack provided on (e.g., extending along the length of) the rod, a pinion gear operatively associated with the rack, and a plurality of intermediate gears operatively engaged between the main bevel gear and the rack to drive the rod responsive to rotation of the main bevel gear.
Data Source
AI summary
An adjustable barbell including a handle assembly having a bar, a weight selector assembly comprising a rod movably coupled to the bar, and a gear assembly configured to cause axial movement of the rod relative to the bar. A lock mechanism is included that has a first configuration disengaged from the gear assembly wherein the weight selector assembly is operable to move the rod to selectively couple one or more of a plurality of removable weights to the handle assembly, and a second configuration in engagement with the gear assembly preventing the rotation of the weight selector assembly.