Toggle Link Locking Piers Handle Distance Reduction
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Solution Overview
Problem
Conventional one-hand operated locking pliers have a large distance between the fixed and movable handles when in an open position, making it difficult for users with smaller hands to operate effectively.
Innovation Solution
The design includes a first and second plier with specific length ratios and a toggle link mechanism, featuring a sliding pin and biasing member, which reduces the distance between handles by adjusting the angle change, allowing for one-hand operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the jaws are opened wider, then the gripping capability is improved, but the distance between the movable handle and the fixed handle increases making one-hand operation difficult
Solution Approach 1:
The patent applies a toggle locking mechanism that dynamically changes the geometric relationship between handles during operation. When the jaws open, the toggle linkages rotate to maintain a relatively constant distance between handle endpoints, allowing the jaws to spread while keeping handles within reachable distance for one-hand operation.
Solution Approach 2:
The invention uses a compound linkage system with multiple pivoting points that transforms the linear opening motion of jaws into a rotational motion of toggle links. This dimensional transformation allows the jaws to open in one dimension while the handle distance in another dimension remains constrained.
2Device complexity
If a conventional locking mechanism is used, then the structure is simple, but the handle distance cannot be controlled during jaw opening
Solution Approach 1:
The locking mechanism is segmented into multiple independent linkage components: a fixed linkage connected to the fixed jaw, a movable linkage connected to the movable jaw, and a toggle link connecting both linkages. Each segment pivots independently around specific points, allowing controlled motion transmission while maintaining manageable complexity through modular design.
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 solution enables users to comfortably operate the locking pliers with one hand by minimizing the distance between handles, enhancing usability for individuals with smaller hands.
Implementation Method 1
A first length is defined between the first pivoting portion and the second pivoting portion, and a second length is defined between the second pivoting portion and the third pivoting portion. The second length is greater than the first length.
Data Source
AI summary
A locking pliers includes a first plier and a second plier. The first plier includes a first handle, a first jaw, and an adjusting member. The second plier includes a second jaw, a first connecting member, a toggle link, and a second handle. The second jaw has a first pivoting portion and a second pivoting portion. The first pivoting portion is pivotally connected to the first handle. The first connecting member is pivotally connected to the second pivoting portion. The toggle link is abutted against the adjusting member and has a third pivoting portion pivotally connected to the first connecting member. The second handle is connected to the first connecting member. A first length defined between the first pivoting portion and the second pivoting portion is less than a second length defined between the second pivoting portion and the third pivoting portion.