Eyebolts Overview

Questions and Answers

What is a primary advantage of powered lifting machines over manually operated chain hoists?

Increased maintenance requirements

Lower operational costs

Higher manual effort required

Speed of operation (correct)

In what situation are powered lifting machines especially beneficial?

For occasional and light lifting tasks

For manual operations requiring intensive training

For heavier or repetitive lifting applications (correct)

For tasks requiring a significant amount of operator presence

What type of operation is most commonly found in powered lifting machines?

Manual operation

Hydraulic operation

Mechanical lever operation

Electric operation (correct)

How do powered lifting machines help reduce fatigue for operatives?

By enabling remote operation away from the load Signup and view all the answers

What scenario might require the use of a permanent lifting facility?

Frequent heavy lifting operations at fixed positions Signup and view all the answers

What is a significant advantage of the eyebolt with link compared to collared eyebolts?

It allows loading at angles up to 15° from the axis. Signup and view all the answers

Which of the following statements about the SWL ratings is true?

Eyebolts with link have lower SWL for axial load compared to collared eyebolts. Signup and view all the answers

What is a key feature of the collared eyebolt's design?

The eye blends to the collar in one plane. Signup and view all the answers

What is the primary limitation when using a collared eyebolt?

It cannot accept a hook directly without additional components. Signup and view all the answers

Which measurement range is typical for thread sizes of eyebolts with link?

20mm to 48mm or ¾” to 1¾” Signup and view all the answers

What is a defining characteristic of the eyebolt with link regarding its load application?

It can support loads applied at an angle to the axis. Signup and view all the answers

Why is the correct fitting of an eyebolt with link considered easier?

It has uniform strength in all directions. Signup and view all the answers

What is the main function of the link in the eyebolt with link?

To allow articulation and connection with other components. Signup and view all the answers

What mechanism does a journal jack use to raise or lower the load?

Ratchet lever and gears Signup and view all the answers

Which type of load is crane forks specifically used to lift?

Palletised loads Signup and view all the answers

What distinguishes C-hooks from crane forks?

Type of loads lifted Signup and view all the answers

Which of the following statements about powered lifting machines is true?

They are often part of larger lifting installations. Signup and view all the answers

What construction material is typically used for C-hooks?

Profiled plate or rolled beam sections Signup and view all the answers

What is the primary function of a journal jack?

To raise or lower a load precisely Signup and view all the answers

What type of loads are generally lifted by both crane forks and C-hooks?

Industrial materials Signup and view all the answers

How do crane forks differ in design compared to C-hooks?

C-hooks are designed for specific loads, unlike crane forks. Signup and view all the answers

What mechanism specifically allows a load to be lowered in a hydraulic system?

Opening a valve Signup and view all the answers

Which type of jack uses pawls that engage with a rack?

Ratchet jack Signup and view all the answers

What supports the load in a screw jack?

A swivel head Signup and view all the answers

During the operation of a ratchet jack, what sustains the load at the end of each stroke?

A pawl Signup and view all the answers

What function does the male screwed shank perform in a screw jack?

It raises or lowers the load Signup and view all the answers

What is the primary purpose of the operating lever in a ratchet jack?

To raise or lower the rack Signup and view all the answers

What is a common characteristic of a journal jack?

Heavy-duty operation Signup and view all the answers

How does a ratchet jack maintain load during its operation?

Through engagement of pawls Signup and view all the answers

What distinguishes lever hoists from other types of hoists?

They have a hand chain and screw brake mechanism. Signup and view all the answers

What feature allows the lever hoist to be adjusted to the correct chain length?

Change-over lever Signup and view all the answers

What type of chain is typically used in lever hoists with fine tolerance?

Calibrated short link steel chain Signup and view all the answers

Which of the following best describes the operational principle of jaw winches?

They use a gripping action on wire ropes. Signup and view all the answers

What effect does using a winch for pulling have on the factor of safety?

It permits a lower factor of safety. Signup and view all the answers

What is the purpose of the chain end stop in a lever hoist?

To prevent the load chain from passing through completely Signup and view all the answers

Which type of applications are jaw winches commonly used for?

Both permanent and temporary applications Signup and view all the answers

What advancement has contributed to the development of more efficient lever hoists?

Improved material and manufacturing technologies Signup and view all the answers

Study Notes

Three main types of eyebolts: Eyebolt with link, Collared, Dynamo.

Eyebolt with Link

Suitable for loads applied at angles, effective when angle does not exceed 15°.
Thread sizes range from 20mm to 48mm (metric) and ¾” to 1¾” (imperial).
Small, blended eye design enhances strength and ease of fitting.
Equipped with a link for articulation and connection to other components.
Lower Safe Working Load (SWL) for axial loads compared to Collared Eyebolts, but higher in other configurations.

Collared Eyebolt

Designed for both axial and angular loading with one-plane blended eye.
Requires a shackle for hook connection due to insufficient eye size.
Available in calibrated short link steel chain and roller chain versions.

Lifting and Pulling Machines

Often called ‘jaw’ or ‘creeper’ winches; utilized for lifting and pulling applications.
Can achieve higher working load limits when used for pulling due to lower safety factors.
Common operation method involves oil valve control for descent via load pressure.

Mechanical Jacks

Types include Ratchet Jacks, Screw Jacks, and Journal Jacks.

Ratchet Jacks

Contains pawls engaging with a rack, allowing for load elevation.
Full load capacity supported by head or toe during operation.

Screw Jacks

Features a male screwed shank fitted into a hollow square thread for raising/lowering loads.

Journal Jacks

Utilizes a bevel gear and screw mechanism operated via a ratchet lever.

Crane Forks and C-Hooks

Directly lift loads from crane hooks without extra accessories.
Crane Forks are versatile for palletized loads; C-Hooks typically lift hollow items like pipes or rolls.

Powered Lifting Machines

Commonly used in fixed installations like overhead cranes or temporary lifting setups.
Operate via electric or pneumatic means, primarily electrically powered.
Ideal for heavier and repetitive lifts due to increased speed and reduced operator fatigue.

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Description

This quiz covers the main types of eyebolts used in various applications, with a focus on their specific advantages and loading capabilities. Learn about the Eyebolt with Link, Collared, and Dynamo types, and understand their differences. The quiz will help you understand when to utilize each type effectively.