Hook Block Base Body Projection Element for Reeving Coordination

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Solution Overview

Problem

The existing hook block systems in cranes often experience unwanted overload due to non-coordinated reeving of the hoist rope, which can lead to inefficiencies and potential damage, especially when switching between different load capacities.

Innovation Solution

A hook block base body with projection elements that ensure proper reeving coordination by only allowing installation when the deflection pulleys are rope-free, preventing the hook block from being overloaded by ensuring the reeving matches the designed capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a small hook block is used to increase travel speed, then productivity is improved, but the hook block may be overloaded if the reeving is not coordinated

Engineering Contradiction:

Improvetravel speedVSAvoidoverload prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The projection element engages with the deflection pulley before the hoist rope is reeved, performing a preliminary check to ensure the pulley is rope-free. This preliminary action prevents subsequent overload by ensuring the reeving is coordinated with the hook block's capacity before operation begins.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The projection element acts as an intermediary mechanism between the hook block base body and the deflection pulley. It mediates the connection by physically blocking installation unless the pulley is in the correct rope-free state, thereby coordinating the reeving with the hook block's designed capacity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the number of strands is reduced to use a small hook, then productivity is improved, but the hook block becomes vulnerable to overload from high-capacity winches

Engineering Contradiction:

Improvehoist movement speedVSAvoidoverload from winch

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The projection element provides preliminary anti-action by preventing installation of the hook block if the deflection pulley is already reeved with the hoist rope. This counteracts the potential harmful effect of overload by ensuring the reeving configuration matches the hook block's reduced capacity before the winch can apply excessive force.

Inventive Principle:

Principle #9Preliminary anti-action

3Reliability

If projection elements are added to ensure coordinated reeving, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvereeving coordinationVSAvoidhook block structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The hook block base body is segmented into functional elements, including the projection element that specifically addresses reeving coordination. This segmentation allows the complexity to be localized to a specific functional component rather than the entire hook block system, making the added reliability feature more manageable.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10662041B2Hook block base body

Publication Date: 2020.05.26 LIEBHERR WERK EHINGEN

AI summary

The invention relates to a hook block base body for fastening to a pulley set of a hoisting apparatus having a plurality of deflection pulleys comprising a means for installing the hook block base body at the pulley set and a load suspension means for suspending a load, characterized by at least one projection element that is configured to cooperate with a deflection pulley on an installation of the hook block base body at the pulley set and only to permit an installation of the hook block base body at the pulley set when the deflection pulley cooperating with the projection element is rope-free.