One-Handed Locking Pliers Trigger Release Mechanism
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Solution Overview
Problem
Existing locking pliers require two hands to release the locked jaws, posing a safety risk due to the stored energy in the upper stationary assembly, which can cause accidental openings and injuries when releasing the jaws.
Innovation Solution
A thumb-actuated trigger release mechanism that allows for one-handed operation to safely release the locked jaws by pivoting the upper jaw relative to the stationary assembly, utilizing spring bias elements for relocking and an indicator for ready status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a release lever is used to unlock the jaws, then the jaws can be released, but the stored energy causes the lower movable handle to fling outward with significant force which can cause injuries
Solution Approach 1:
The release mechanism is segmented into two independent parts: the upper jaw release system and the lower handle system. When the release lever is actuated, it first releases the upper jaw from the workpiece, allowing the stored energy to be gradually dissipated through controlled jaw opening rather than immediate handle flinging. This segmentation prevents the harmful sudden release of energy that causes injuries.
Solution Approach 2:
The release lever performs a preliminary action by disengaging the upper jaw locking mechanism before the lower handle can fling outward. This preliminary release of the upper jaw creates a controlled sequence where the workpiece is first freed, then the lower handle returns to its neutral position, preventing accidental injuries from sudden handle movement.
2Device complexity
If the release lever is positioned on the inside of the lower movable handle, then the mechanism is compact, but accidental openings can occur with unintentional contact with the release lever
Solution Approach 1:
The release lever acts as an intermediary between the user's intentional action and the jaw release function. It is positioned and designed to require deliberate, two-handed operation, serving as a mediator that prevents accidental activation while maintaining compact device configuration. The lever's positioning and operational requirement create a safety buffer against unintentional contact.
Solution Approach 2:
The release lever mechanism incorporates preliminary anti-action by requiring intentional, deliberate engagement to activate the release function. The positioning and design of the lever create a protective effect that counteracts accidental contact, ensuring that only purposeful user action can release the jaws, thus preventing reliability issues from unintended activation.
3Device complexity
If the release lever requires two hands to operate, then the release mechanism is simple, but it is not appropriately or easily possible to release the locked jaws with one hand
Solution Approach 1:
The release mechanism transitions from a static two-handed operation requirement to a dynamic one-handed capability. The lever is designed with specific geometric relationships and pivot points that allow a single hand to apply sufficient force and control the release sequence, making the mechanism adaptable to different operational scenarios while maintaining structural simplicity.
Solution Approach 2:
The release lever's physical parameters (length, pivot position, engagement point) are optimized to enable one-handed operation. By changing these geometric parameters, the lever arm mechanics provide sufficient mechanical advantage for a single hand to control the release, transforming the operational requirement from two hands to one hand without increasing overall device complexity.
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 quick, safe, and easy one-handed release of locked jaws without the lower handle flinging outward, improving user safety and convenience by allowing single-handed operation of locking pliers.
Implementation Method 1
Spring bias elements are provided to urge the upper jaw and the trigger release mechanism to return after release
Data Source
AI summary
A jaw release mechanism for locking pliers which utilize an over-center toggle locking mechanism and wherein the normally stationary upper jaw of the pliers is pivotally fastened to the main body of the pliers. This normally stationary upper jaw is releaseably retained in a normally stationary position relative to the main body of the pliers by a thumb actuated trigger release mechanism whereby the locked pliers may be safely released with the same hand which grasps and manipulates the pliers.