Stable Lifting Hook for Drill Casing with Bolt Hole Engagement

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Solution Overview

Problem

Existing drill casing handling devices lack stability and secure attachment methods, particularly for pipes with bolt holes, leading to potential damage and unsafe lifting practices.

Innovation Solution

A stable lifting hook design featuring a hybrid C-L shape with a linear mid-section, curved sections of specific diameters and radii, a beveled toe, and a flattened eye for secure engagement with drill casing bolt holes, allowing balanced and secure lifting with a 45° orientation of hoist lines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional lifting hooks are used on drill casings, then lifting can be performed, but the hooks lack stability and may cause damage to the casing threads or result in unsafe lifting practices

Engineering Contradiction:

Improveattachment stabilityVSAvoidthread damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The lifting device is divided into distinct functional segments: a C-shaped body for engagement, a linear mid-section for structural integrity, and a flattened eye for secure attachment. This segmentation allows each part to perform its specific function optimally without compromising the casing threads.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The hook features localized geometric properties: curved sections with specific radii (R1 ≈ 0.875-1 inch) for smooth engagement, a beveled inner edge on the toe for precise insertion, and a flattened distal end defining an eye for secure shackle attachment. These local quality variations ensure stable attachment without thread damage.

Inventive Principle:

Principle #3Local quality

2Reliability

If conventional lifting methods are used, then lifting can be performed, but the attachment is not secure and may lead to unsafe lifting practices

Engineering Contradiction:

Improvelifting safetyVSAvoidattachment method complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The lifting hook combines multiple functions in a single device: the C-shaped body engages with the casing, the curved sections provide structural strength, and the flattened eye accommodates standard shackles. This universal design secures attachment to drill casings with bolt holes while maintaining compatibility with conventional lifting hardware.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If a stable attachment method is implemented, then secure lifting is achieved, but the device complexity increases

Engineering Contradiction:

Improveattachment securityVSAvoidhook structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the C-shaped engagement body, the linear mid-section, and the flattened eye into a single integrated hook structure. This combination achieves stable and secure attachment to drill casings while avoiding the need for multiple separate components, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11772939B2Stable lifting hook

Publication Date: 2023.10.03 EQUIP CORP OF AMERICA

AI summary

A lifting hook, comprising a linear mid-section; a first curved section extending from the mid-section and ending in a generally flat distal end or toe for inserting into an aperture in a drill casing; and a second curved section extending from the mid-section opposite the first curved section and having a flattened distal end defining an eye or hole.