Locking Pliers Toggle Link Mechanism Reduces Jaw Clamping Force
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Solution Overview
Problem
Existing locking pliers require excessive effort to operate, which is inefficient and cumbersome.
Innovation Solution
The design incorporates a fixed jaw, moveable jaw, fixed handle, adjusting screw, toggle link, power links, and a moveable handle with a biasing spring, optimized with a toggle link and power links to reduce operational effort, utilizing components from Irwin item no. 502L3 vise grips, and alternative configurations for improved ergonomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional locking pliers design is used, then structural simplicity is maintained, but excessive effort is required to operate
Solution Approach 1:
The patent introduces a movable handle that transitions between locked and unlocked positions, creating a dynamic system. The movable handle pivots about a pin to engage or disengage the toggle link mechanism, allowing the user to switch between high-mechanical-advantage (locked) and low-mechanical-advantage (unlocked) states. This dynamic configuration enables easy operation during locking while maintaining structural simplicity.
Solution Approach 2:
The patent divides the handling mechanism into separate functional components: a fixed handle, a movable handle, a toggle link, and power links. This segmentation allows each component to perform its specific function independently - the fixed handle provides structural support, the movable handle enables operation, the toggle link provides mechanical advantage, and the power links transmit force. This modular approach reduces operational effort while controlling overall complexity.
2Ease of operation
If toggle link and power links are added to reduce operational effort, then ease of operation improves, but device complexity increases
Solution Approach 1:
The patent combines the toggle link mechanism with the handle assembly to create an integrated locking system. The toggle link connects the movable handle to the power links, merging the handling function with the mechanical advantage function. This integration allows the system to achieve high mechanical advantage (reducing operational force) while minimizing the number of separate components compared to traditional designs.
Solution Approach 2:
The power links serve as intermediary elements between the movable handle and the jaws. Instead of directly connecting the handle to the jaws, the power links transmit and amplify the force applied by the user through the toggle link mechanism. This intermediary approach enables significant force reduction while maintaining a relatively simple component structure, as the power links are essentially elongated connecting 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
The locking pliers require less effort to operate, enhancing user convenience and efficiency by leveraging the mechanical advantages of the toggle link and power links to reduce the force needed for jaw movement.
Implementation Method 1
leveraging the mechanical advantages of the toggle link and power links to reduce the force needed for jaw movement
Implementation Method 2
a biasing spring
Data Source
AI summary
A locking pliers preferably includes a fixed jaw, a moveable jaw, a fixed handle, a toggle link, a power link and a moveable handle. The fixed jaw is retained in a first end of the fixed handle. The moveable jaw is pivotally retained in substantially the first end of the fixed handle. An adjustment screw is retained in a second end of the fixed handle. An end of the adjustment screw engages a first end of the toggle link. The moveable handle is pivotally engaged with the toggle link. A first end of the power link is pivotally engaged with a second end of the toggle link. The power link is also slidably engaged with the moveable handle. The moveable jaw is pivotally engaged with a second end of the power link.