Compound Pliers Leverage Mechanism for High Grip Force

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Solution Overview

Problem

Conventional pliers lack sufficient gripping and cutting power, and existing compound pliers do not fully address the need for efficient adjustment and leverage ratios to prevent slippage during material handling.

Innovation Solution

The compound pliers design features a main joint connecting right and left jaws, with levers and handle joints forming a four-bar mechanism, and an auxiliary joint with protrusions that allow for layered construction and enhanced gripping capabilities, providing a 10:1 leverage ratio and preventing slippage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If conventional pliers design is used, then the device is simple to manufacture, but the gripping and cutting power is insufficient

Engineering Contradiction:

Improvegripping powerVSAvoidmechanism complexity

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The pliers are divided into multiple functional segments including a fixed jaw, a movable jaw, a fixed handle, a movable handle, and intermediate linkages. This segmentation allows each component to perform a specific function while collectively providing compound leverage action that amplifies gripping force.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple mechanical functions into a single integrated tool by merging the fixed jaw, movable jaw, fixed handle, movable handle, and intermediate linkages into one cohesive pliers structure. This integration enables the device to provide both gripping and cutting functions with amplified force through compound leverage.

Inventive Principle:

Principle #5Merging (Combining)

2Power

If compound pliers with leverage mechanism are used, then the gripping power is enhanced, but the device complexity increases

Engineering Contradiction:

Improvecutting powerVSAvoidmechanism complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The cutting function is segmented into a separate movable jaw with cutting edges, distinct from the gripping jaws. This allows the cutting mechanism to be optimized independently while working in conjunction with the leverage mechanism to deliver high cutting power.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent merges the cutting function into the existing compound leverage mechanism by incorporating cutting edges on the movable jaw, allowing the same mechanical advantage that amplifies gripping force to also amplify cutting force.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If adjustment mechanism is added to pliers, then the adaptability is improved, but the ease of operation deteriorates

Engineering Contradiction:

Improveadjustment capabilityVSAvoidoperation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The pliers incorporate a self-adjusting mechanism where the intermediate linkages automatically adjust the jaw positioning and leverage ratio based on the size and position of the workpiece, eliminating the need for manual adjustment by the operator.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs dynamic adjustment capabilities where the movable jaw and intermediate linkages can adapt their position and leverage ratio in real-time during operation, allowing the tool to maintain optimal mechanical advantage across different workpiece sizes and positions.

Inventive Principle:

Principle #15Dynamics

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

This design significantly enhances gripping and cutting power while ensuring secure grip retention, making it difficult for the operator to release the object without intent, and allows for versatile use in various applications like masonry tools and shears.

Implementation Method 1

a main joint pivotally connecting a right jaw to a left jaw

Methodology Applied

Scientific EffectPivotal connection: Hinge

Implementation Method 2

an auxiliary joint pivotally connecting a right handle joint lever to a left handle joint lever

Methodology Applied

Scientific EffectPivotal connection: Hinge

Implementation Method 3

The right handle indent receives an auxiliary joint protrusion. The auxiliary joint protrusion is formed around the auxiliary joint.

Methodology Applied

Scientific EffectMechanical interlocking: Mechanical Fastener

Implementation Method 4

The compound pliers design features a main joint connecting right and left jaws, with levers and handle joints forming a four-bar mechanism... providing a 10:1 leverage ratio

Methodology Applied

Scientific EffectMechanical advantage: Mechanical Advantage

Data Source

PatentUS10493601B2Compound pliers

Publication Date: 2019.12.03 RUQIAN ZHANG

AI summary

A compound pliers has a main joint pivotally connecting a right jaw to a left jaw; a right jaw lever extending from the left jaw and a left jaw lever extending from the right jaw; an auxiliary joint pivotally connecting a right handle joint lever to a left handle joint lever; a right handle joint connecting a right jaw lever to a right handle joint lever; a left handle joint connecting a left jaw lever to a left handle joint lever; and a right handle indent formed on the right jaw lever. The right handle indent receives an auxiliary joint protrusion. The auxiliary joint protrusion is formed around the auxiliary joint.