Hydraulic Chisel Removal Tool with Pivotable Base

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Solution Overview

Problem

Existing tools for dismantling chisels from chisel holders are difficult to use, require additional support structures, and are inefficient, especially in cramped spaces and when chisel heads are worn or broken, leading to system failures and increased assembly complexity.

Innovation Solution

A tool with an actuator coupled to a fluid-acted cylinder-piston system or an electromotive unit, allowing for high-pressure force transmission, featuring a pivotable base part with a support section for stable attachment to the chisel holder, and an expulsion mandrel that moves along an arcuate path to overcome static friction and reduce torque requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a double lever tool is used for chisel dismantling, then the chisel can be pushed out of the chisel holder, but the tool is difficult to handle and time-consuming in cramped assembly space

Engineering Contradiction:

Improveease of chisel dismantlingVSAvoidtime for chisel removal

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent replaces the manual double lever mechanical system with a hydraulic actuator system. The hydraulic cylinder provides automated actuation that drives the expulsion mandrel to push the chisel out, eliminating the need for manual lever manipulation and significantly reducing operation time while improving ease of use in cramped spaces.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs a hydraulic cylinder to provide the necessary force for chisel expulsion. The hydraulic system delivers controlled high force through the expulsion mandrel, enabling easy and quick chisel removal without requiring manual lever operation, thus resolving the contradiction between ease of operation and time loss.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Adaptability or versatility

If a tool with extraction claws is used, then chisels can be dismantled, but the tool cannot be used when chisel heads are worn or broken

Engineering Contradiction:

Improveadaptability to different chisel conditionsVSAvoidreliability of chisel dismantling

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent designs a universal expulsion mandrel system that can handle various chisel conditions including worn or broken chisel heads. The hydraulic actuated mandrel provides consistent expulsion force regardless of chisel head condition, making the tool adaptable to different scenarios and maintaining reliable operation where extraction claw-based tools fail.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If a support arm is attached to the chisel holder, then the chisel can be pushed out, but additional parts and assembly work are required

Engineering Contradiction:

Improveease of chisel removalVSAvoidcomplexity of tool assembly

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent merges the support function and expulsion function into a single integrated tool body. The expulsion mandrel is directly coupled to the hydraulic cylinder within the tool housing, eliminating the need for separate support arms and multiple assembly steps. This integration maintains ease of operation while significantly reducing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

4Ease of operation

If the ram is adjusted to push out the chisel, then the chisel can be removed, but the installation space on the chisel holder must be increased

Engineering Contradiction:

Improveease of chisel removalVSAvoidinstallation space on chisel holder

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent nests the hydraulic cylinder and actuation mechanism within the existing chisel holder structure. The expulsion mandrel is housed inside the chisel holder bore, allowing the chisel to be pushed out through the existing opening without requiring additional installation space on the chisel holder body.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 easy and quick chisel removal without excessive effort, eliminating the need for additional support structures and allowing for compact arrangement on milling drum tubes, while maintaining reliability and simplicity in operation.

Implementation Method 1

The actuator is coupled directly or indirectly to a fluid-acted cylinder-piston system... a high pressure can be built up on the piston and correspondingly high forces can be transmitted to the actuator

Methodology Applied

Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

the expulsion mandrel moves along an arcuate path with the adjustment movement of the actuator, then a varying torque curve can be realized... the static friction between the chisel and the chisel holder must first be overcome

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP2128381B1Tool for removing a cutting tool

Publication Date: 2017.02.22 WIRTGEN GMBH

AI summary

The tool (10) has a base section (20.1) for accommodating an actuator (60), where the actuator has a sprouting thorn (65). The actuator is directly or indirectly coupled to a cylinder-piston system or at an electro-motor unit. The actuator is mounted at the base section around a pivoted bearing.