Crane Hook Block Weight Mounting With Vibration Damping

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Solution Overview

Problem

Existing crane hook blocks with additional weights are prone to damage due to resonance and stress peaks, especially when used with vibrating equipment, leading to safety hazards and costly repairs.

Innovation Solution

Incorporating a damping device between the additional weight and the hook block to mitigate forces and relative movements, using elastomer or fluid dampers to adjust damping strength and prevent resonance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional weights are fixed to the hook block to stabilize the crane rope, then the operating weight is increased and the crane rope is stabilized, but the additional weights and receiving device are subjected to significant stress and resonance forces that can cause them to break off or fall off

Engineering Contradiction:

Improvestability of crane ropeVSAvoidstrength of additional weight connection

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies beforehand cushioning by introducing a damping device (such as a spring element or elastomer) between the additional weight and the receiving device on the hook block. This damping device is pre-installed to absorb and mitigate resonance forces and stress peaks before they can damage the connection, thereby maintaining the stability function of the additional weight while protecting the connection from failure

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The damping device serves as an intermediary element between the additional weight and the receiving device. It mediates the force transmission by filtering out harmful resonance forces while allowing the necessary stabilizing function to occur, thus protecting the connection without compromising the stability purpose

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If additional weights are used to compensate for tension-related behavior of the crane rope, then the crane rope stabilization is improved, but the mounting devices for additional weights are subjected to overload due to vibrations from vibrating equipment

Engineering Contradiction:

Improvecrane rope stabilizationVSAvoidvibration stress on mounting device

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful vibration forces into a beneficial damping effect by using the damping device to absorb and dissipate the vibration energy. The damping device transforms the harmful resonance forces into harmless heat energy through internal friction, thereby protecting the mounting device while maintaining the stabilizing function of the additional weight

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Adaptability or versatility

If additional weights are reversibly fixed to the hook block for different operating conditions, then the adaptability is improved, but the additional weights may break off or fall off due to resonance or stress peaks

Engineering Contradiction:

Improveadjustability of operating weightVSAvoidsecurity of additional weight attachment

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The damping device is pre-installed on the hook block before the additional weights are attached. This beforehand cushioning ensures that when additional weights are reversibly mounted for different operating conditions, the damping protection is already in place to prevent breakage from resonance forces, thus enabling safe adaptability

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

Prevents damage to additional weights and the hook block by damping vibrations, ensuring stable operation and reducing maintenance costs.

Implementation Method 1

a damping device for damping forces and/or relative movements occurring between the additional weight and the receiving device is arranged between the receiving device and the additional weight

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentEP4678584A1Hook block for a crane, cheek weight, and crane

Publication Date: 2026.01.14 MOHR-HEBETECHNIK GMBH

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AI summary

The invention relates to a hook block (101) for a crane for lifting a load by means of a crane rope, comprising a base body (103, 105), a crane hook (125), and an additional weight (201), wherein the crane rope is forcefully received on the base body (103, 105) in an operating position, and the hook block is suspended on the crane rope along a lifting axis (181), wherein the crane hook (125) is forcefully received on the base body (103, 105) 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 the additional weight (201), which is fixed, in particular reversibly, to a receiving device (131, 141) of the hook block. The invention further relates to an additional weight (201) for a hook block and a crane.