Pliers Pivot Bolt Locking Mechanism

Solution Overview

Problem

Existing pliers designs with complex configurations for movement blocks are cumbersome and require special manipulation for adjusting the mouth opening width, making them difficult to handle effectively.

Innovation Solution

A pliers design where the movement block is integrated into one of the pliers legs, allowing for automatic engagement during displacement, eliminating the need for separate manipulation or additional components on the pivot bolt, and utilizing a recessed longitudinal slot and varying cylinder portions to control the pivot bolt's movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a complex configuration with separate manipulation components is used for the movement block, then the pivot bolt can be securely locked, but the device complexity increases and ease of operation deteriorates

Engineering Contradiction:

Improvelocking reliabilityVSAvoidmovement block configuration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The movement block function is merged directly into the pliers leg structure. The blocking surface is formed by the longitudinal slot's bottom surface and lateral walls, eliminating the need for separate blocking components. This integration reduces device complexity while maintaining secure locking of the pivot bolt during mouth width adjustment.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pliers leg's longitudinal slot structure automatically provides the blocking function during normal operation. When the pivot bolt is pressed into the longitudinal slot, the slot's geometry self-generates the blocking effect without requiring additional user manipulation or separate blocking mechanisms, achieving both simplicity and reliability.

Inventive Principle:

Principle #25Self-service

2Reliability

If a complex configuration with separate manipulation components is used for the movement block, then the pivot bolt can be securely locked, but the ease of operation deteriorates due to special manipulation requirements

Engineering Contradiction:

Improvelocking reliabilityVSAvoidadjustment operation simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The movement block function is merged directly into the pliers leg structure. The blocking surface is formed by the longitudinal slot's bottom surface and lateral walls, eliminating the need for separate blocking components. This integration reduces device complexity while maintaining secure locking of the pivot bolt during mouth width adjustment.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pliers leg's longitudinal slot structure automatically provides the blocking function during normal operation. When the pivot bolt is pressed into the longitudinal slot, the slot's geometry self-generates the blocking effect without requiring additional user manipulation or separate blocking mechanisms, achieving both simplicity and reliability.

Inventive Principle:

Principle #25Self-service

3Reliability

If additional components are added to the pivot bolt for movement blocking, then the locking function is enhanced, but the manufacturing complexity and device complexity increase

Engineering Contradiction:

Improvemovement blocking effectivenessVSAvoidmanufacturing simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The movement block function is merged directly into the pliers leg structure. The blocking surface is formed by the longitudinal slot's bottom surface and lateral walls, eliminating the need for separate blocking components. This integration reduces device complexity while maintaining secure locking of the pivot bolt during mouth width adjustment.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The blocking function is extracted from the pivot bolt and relocated to the pliers leg's longitudinal slot structure. This removes the need for additional components on the pivot bolt, simplifying both the pivot bolt design and the overall manufacturing process while maintaining effective movement blocking.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10744622B2Pliers

Publication Date: 2020.08.18 KNIPEX WERK C GUSTAV PUTSCH KG

AI summary

Pliers having two pliers legs that cross at a pivot bolt, of which pliers leg is fixed and the other is movable with respect thereto, wherein the pivot bolt is optionally fixable in a longitudinal slot in the fixed pliers leg by toothing engagement in order to set a mouth opening width, by means of engagement teeth formed on the longitudinal slot and one or more mating teeth formed on the pivot bolt. The toothing engagement is releasable by the pivot bolt being pressed down in a first direction of movement and subsequently the pliers legs being moved together, or by the pivot bolt automatically passing over one or more engagement teeth, wherein the pivot bolt moves in a second direction of movement on passing over an engagement tooth. A movement block is provided at least partially on one pliers leg and are effective for some of the engagement teeth, and the movement block comes into effect during a displacement of the pliers legs together, being effective for the second direction of movement of the pivot bolt.