Demolition Shear Piercing Tip Assembly for Nose Wear Resistance

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Solution Overview

Problem

Demolition shears experience nose wear and retract force issues during jamming and snagging situations due to the piercing tip insert, leading to potential damage or failure.

Innovation Solution

The design incorporates a piercing tip with two halves and a nose seat configuration that includes a narrowed nose portion with a wear shoe and strategically aligned piercing tip halves, which are rotationally restrained and secured with threaded connectors, along with a jaw pivot shaft assembly and lateral stabilizing puck assemblies to resist lateral forces and minimize wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a piercing tip insert is used in demolition shears, then the piercing capability is improved, but nose wear increases and the piercing tip is susceptible to damage during jamming or snagging situations

Engineering Contradiction:

Improvepiercing capabilityVSAvoidnose wear and damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The piercing tip is divided into two separate halves that are inserted into corresponding recesses in the upper jaw, allowing each half to be independently retained and replaced while maintaining the overall piercing function

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The upper jaw is pre-configured with recesses and retention mechanisms (threaded connectors, bearing surfaces) that are designed in advance to secure the piercing tip halves and resist retract forces before any jamming or snagging situation occurs

Inventive Principle:

Principle #10Preliminary action

2Reliability

If the piercing tip insert is secured with threaded connectors, then retention is improved, but the complexity of assembly and disassembly increases

Engineering Contradiction:

Improvepiercing tip retentionVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The retention system is segmented into modular components (threaded connectors, bearing surfaces, recesses) that can be independently assembled and disassembled, simplifying the overall assembly process while maintaining secure retention

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bearing surfaces act as intermediaries between the piercing tip halves and the upper jaw, distributing loads and facilitating easier assembly and disassembly of the threaded connectors

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2983853B1Piercing tip and upper jaw for a demolition shear

Publication Date: 2021.10.13 GENESIS ATTACHMENTS LLC

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AI summary

A demolition shear and a piercing tip insert and nose configuration for a demolition shear which resists nose wear and resists retract forces exerted on the piercing tip insert in jamming situations and in the event of snagging of the piercing tip insert. There is a need for a demolition shear having a piercing tip insert and nose configuration to reduce nose wear and to resist retract forces exerted on the piercing tip insert in jamming situations and in the event of snagging of the piercing tip insert.