Crane Hook Block Weight Mounting for Stable Rope Operation

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Solution Overview

Problem

Existing methods for attaching additional weights to crane hook blocks are complex, requiring additional securing devices and stringent manufacturing processes, and do not effectively distribute weight forces during operation and transport.

Innovation Solution

A hook block design utilizing a retaining bolt with a specific tolerance to a retaining bore and a support bolt with a larger tolerance to a support bore, allowing reversible attachment of additional weights, ensuring defined load distribution and preventing unwanted movement during operation and transport.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional weights are attached using hooks or cams welded to the hook block, then the additional weights can be securely attached, but an additional securing device is required and welded assemblies are subject to stringent qualification requirements

Engineering Contradiction:

Improvesecure attachment of additional weightsVSAvoidadditional securing device and welding requirements

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The retaining bolt and support bolt are integrated into the hook block structure, combining the attachment function with the existing structural elements. The additional weight is secured through a integrated bolt system rather than separate welded components, eliminating the need for additional securing devices while maintaining secure attachment

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The bolt and bore connection system replaces permanent welded assemblies with removable, replaceable components. This allows for easier maintenance and replacement without requiring complex welding qualifications, while still providing reliable secure attachment during use

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Adaptability or versatility

If additional weights are attached laterally using cams inserted into recesses, then the attachment is perpendicular to the lifting axis, but additional securing is required and complex geometry is unavoidable

Engineering Contradiction:

Improvelateral attachment perpendicular to lifting axisVSAvoidcomplex geometry of additional weight

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The attachment system is segmented into two functional components: a retaining bolt for securing the additional weight and a support bolt for positioning. This segmentation allows each component to have a simple, optimized geometry rather than requiring the entire additional weight to have complex geometry for both functions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support bolt acts as an intermediary element that provides positioning and stability without requiring complex geometry on the additional weight itself. The retaining bore and support bore provide simple cylindrical interfaces that facilitate easy attachment while maintaining lateral positioning

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If additional weights are pushed onto bolts and fixed by screwing, then the attachment is reversible, but the tolerance distribution does not optimize force distribution during operation

Engineering Contradiction:

Improvereversible attachment of additional weightsVSAvoidtolerance distribution for force distribution

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

Different tolerance levels are applied locally to different connection points: the retaining bore has tighter tolerances to ensure proper force distribution and secure attachment, while the support bore has larger tolerances to facilitate easy assembly and positioning. This local differentiation optimizes both force distribution and ease of operation

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention specifies particular tolerance ranges for the retaining bolt and support bolt connections to optimize force distribution. By controlling the dimensional parameters within specific ranges, the system achieves both reversible attachment and optimal mechanical performance during crane operation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4671183A1Hook bottle for a crane, additional weight for a hook bottle, lifting harness and crane

Publication Date: 2025.12.31 MOHR-HEBETECHNIK GMBH

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Figure 3a~3b
Figure 4~5

AI summary

The invention relates to a hook block for a crane for lifting a load by means of a crane rope, comprising a base body and a crane hook, wherein the crane rope is force-conductingly received on the base body and the hook block is suspended in an operating position along a lifting axis on the crane rope, the crane hook is force-conductingly received on the base body at a hook position for receiving the load, and an operating weight of the hook block for stabilizing the crane rope in the operating position is variably adjustable by means of a first additional weight that can be reversibly fixed to the hook block.wherein a retaining bolt is received in the base body along a retaining bolt axis arranged substantially orthogonally to the lifting axis and forms a first receiving device for force-conducting receipt of the first additional weight on the first receiving device by means of a retaining bore arranged in the first additional weight, with a first retaining length projecting substantially orthogonally to the base body on a first side of the base body.