One-Hand Locking Pliers Toggle Mechanism
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Solution Overview
Problem
Conventional pliers-type hand tools with toggle-locking mechanisms require two hands to adjust the clamping force and locking mechanism, limiting user flexibility when gripping a workpiece.
Innovation Solution
A one-hand locking tool mechanism that allows adjustment of jaw distance and clamping force using a single hand, featuring a rotatable adjustment screw accessible via a second actuating mechanism, enabling locking and unlocking with the same hand movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional adjustment screw mechanism is used to adjust clamping force, then the clamping force can be adjusted, but two hands are required for operation limiting user flexibility
Solution Approach 1:
The patent combines the adjustment screw mechanism with a release lever system into a single integrated actuating mechanism. The release lever engages with the toggle locking mechanism and simultaneously controls the adjustment screw, allowing both locking/unlocking and adjustment functions to be performed with one hand. This merging of functions resolves the contradiction by enabling one-handed operation without proportionally increasing device complexity.
Solution Approach 2:
The release lever serves multiple functions: it acts as both a locking/unlocking mechanism and an adjustment control. By making this single component universal, the patent eliminates the need for separate mechanisms for each function, thereby enabling one-handed operation while keeping the overall device complexity manageable.
2Ease of operation
If the adjustment screw is mounted in the fixed handle, then the mechanism is stable, but it cannot be manipulated by the same hand that grips the handles
Solution Approach 1:
The patent relocates the adjustment mechanism from the fixed handle to the movable handle, changing the spatial dimension of access. This allows the user to grip the fixed handle with one hand while manipulating the adjustment screw on the movable handle with the same hand, or to use the release lever on the movable handle for one-handed operation. This dimensional change in mechanism placement resolves the contradiction between accessibility and stability.
3Ease of operation
If a release lever is added to enable one-handed unlocking, then unlocking becomes easier, but the device complexity increases
Solution Approach 1:
Rather than adding a separate release lever as an independent component, the patent integrates the release function into the existing toggle locking mechanism. The release lever works in conjunction with the toggle linkage and adjustment screw, merging multiple functions into a coordinated system. This integration approach enables easy unlocking while minimizing the increase in overall device complexity compared to adding entirely separate mechanisms.
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
Enables one-handed operation for locking, unlocking, and adjusting the tool, freeing the other hand to hold a workpiece or perform other tasks, while maintaining secure clamping and adjustable force application.
Implementation Method 1
The adjusting screw is translated relative to the fixed handle to modify the physical dimensions of the toggle-locking mechanism to vary the effective length of the linkage of the toggle-locking mechanism
Implementation Method 2
The toggle-locking mechanism typically uses an over-center linkage to lock the jaws relative to one another
Implementation Method 3
A spring may bias the catch in a first direction
Implementation Method 4
A collar is adjustably mounted on an adjustment screw such that the collar moves when the adjustment screw is rotated
Data Source
AI summary
A locking tool is provided that comprises an adjustment mechanism that can adjust the distance between the jaws, and the clamping force exerted by the jaws on a workpiece, using the same hand that grips the handles of the tool. A locking tool is also provided where the tool can be locked by moving the handles toward one another. Once locked, the pliers can be unlocked and the jaws opened by squeezing the handles toward one another in the same manner, in the same direction and using the same hand as was done to lock the pliers. As a result the pliers can be locked and unlocked using one-hand and using the same hand movement to both lock and unlock the pliers.