A guide to selecting non powered hand tools
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A Guide to Selecting Non-Powered Hand Tools. Ergonomics Design Guidelines to prevent WMSDs. Credits . The technical contents of this slide show come from: “ Easy Ergonomics: A Guide to Selecting Non-Powered Hand Tools” Cal/OSHA and DHHS (NIOSH) Publication 2004-164.

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A guide to selecting non powered hand tools

A Guide to Selecting Non-Powered Hand Tools

Ergonomics Design Guidelines to prevent WMSDs


Credits

Credits

The technical contents of this slide show come from:

“Easy Ergonomics: A Guide to Selecting Non-Powered Hand Tools” Cal/OSHA and DHHS (NIOSH) Publication 2004-164.

http://www.cdc.gov/niosh/docs/2004-164/default.html


Purpose

Purpose:

To help you find non-powered hand tools that are less likely to cause injury.

These tools require less force, less repeated movement and less awkward positioning of the body.


A guide to selecting non powered hand tools

Non-powered hand tools are widely used in many industries including: construction, manufacturing and agriculture.


Problem

Problem?

Musculoskeletal disorders (MSDs) can be related to using hand tools at work. These injuries can be costly and result in unnecessary suffering and lost workdays.


The best tool is one that

The best tool is one that…

  • Fits the job you are doing

  • Fits the work space available

  • Reduces the force you need to apply

  • Fits your hand

  • Can be used in a comfortable work position

  • Is safe to use


Be aware of msd risk factors

Be aware of MSD risk factors

Awkward postures

of the back, shoulders, elbows or wrists.

Awkward postures may involve: bending, stooping, twisting and reaching.


Be aware of msd risk factors1

Be aware of MSD risk factors

Contact pressure

Pressure from a hard surface, point, or edge on any part of the body.


Be aware of msd risk factors2

Be aware of MSD risk factors

Power Grip

The hand grip that allows maximum hand power for high force tasks.

All the fingers wrap around the handle.


Be aware of msd risk factors3

Be aware of MSD risk factors

Pinch Grip

The hand grip that provides control for precision and accuracy.

You can’t exert high forces with a pinch grip.

The tool is gripped between the thumb and the fingertips.


Risk factors increase your risk for injury

Risk factors increase your risk for injury

These matter:

  • Exposure duration time (how long)

  • Exposure frequency (how often)

  • Intensity or severity of the exposure


Guidelines to reduce your injury risk

Guidelines to reduce your injury risk :

A.

  • Know your job

  • Look at your work space

  • Improve your posture

  • Tips for Selecting Hand Tools

B.

C.

D.


Know your job

Know your job

A.

Pick the right tool for the job:

  • Use a tool for its intended

    purpose


Know your job1

Know your job

A.

Pick the right tool for the job:

  • Do you need to a tool for power?

  • Do you need a tool for precision?


Know your job2

Know your job

A.

Cutting, pinching gripping tools:

  • pliers

  • snips

  • cutters


Know your job3

Know your job

A.

Striking tools

  • Hammers

  • Mallets


Know your job4

Know your job

A.

Driving tools

  • Screwdrivers

  • Hand wrenches

  • Nut drivers

  • T-handle wrenches


Know your job5

Know your job

A.

Struck or hammered tools

  • Punches

  • Chisels

  • Nail sets


Look at your work space

Look at your work space

B.

Pick a tool that works best with the available space.

You can apply more force using a power grip than a pinch. Try to use a power grip when you need more force.


Look at your work space1

Look at your work space

B.

Awkward postures may cause you to use more force.

If you work in a cramped space it is better to use a shorter tool that fits within the work space.


A guide to selecting non powered hand tools

Improve your posture

C.

Awkward postures can make your body work harder.


A guide to selecting non powered hand tools

Improve your posture

C.

By:

  • Changing the position of

    the workpiece

    OR

  • Changing Your position

    • Sit down

    • Stand up

Bad posture Better posture


A guide to selecting non powered hand tools

Improve your posture

C

Choose a tool that doesn’t require high continuous force or awkward postures.

The right tool won’t cause pain and fatigue because your body parts will be relaxed.


Design guidelines

Design guidelines

These guidelines were developed by Cal/OSHA and DHHS-NIOSH.

The more guidelines you apply to hand tool selection, the safer and healthier for you and your employees.


Select the tool

D.

Select the tool

  • For single-handle tools using a POWER grip:

    A comfortable handle diameter is 1¼” - 2”.

  • You may increase the diameter by adding a sleeve to the handle


Select the tool1

D.

Select the tool

  • For single-handle tools used in PRECISION tasks:

    A comfortable handle diameter is ¼” - ½”..


Select the tool2

D.

Select the tool

  • For tools with 2 handles used with a power grip:

    • OPEN GRIP SPAN no wider than 3½” when fully open

    • CLOSED GRIP SPAN no smaller than 2” when fully closed

When continuous force is required, consider using a clamp, a grip or locking pliers.


Select the tool3

D.

Select the tool

  • For tools with 2 handles used for PRECISION tasks:

    • OPEN GRIP SPAN no wider than 3”

    • CLOSED GRIP SPAN

      no smaller than 1”


Select the tool4

D.

Select the tool

  • For pinching, gripping or cutting tools with 2 handles:

    Look for spring-loaded handles that return to the open position.


Select the tool5

D.

Select the tool

  • Pick a tool without sharp edges or finger grooves on the handle.


Select the tool6

D.

Select the tool

  • Pick a tool that is coated with soft material.

Adding a sleeve to the tool handle pads the surface but also increases the diameter of the handle.


Select the tool7

D.

Select the tool

  • Pick a tool that allows you to work with a straight wrist.

    Straight tool? Or bent tool?


Select the tool8

D.

Select the tool

  • Pick a tool that allows you to work with a straight wrist.

    Straight tool? Or bent tool?


Select the tool9

D.

Select the tool

  • Pick a tool that can be used with your dominant hand or one that can be used with either hand.


Select the tool10

D.

Select the tool

  • For HIGH FORCE tasks:

    The handle length should be longer than the widest part of your hand.

Bad

Make sure the end of the handle doesn’t press into your palm.

Good


Select the tool11

D.

Select the tool

  • Pick a tool with handles that have a non-slip surface for a better grip.

Adding a sleeve can improve the surface texture of the handle. Make sure the sleeve fits snugly during use.


The checklist

The Checklist

  • You can use a checklist to compare similar tools.

    http://www.dir.ca.gov/DOSH/dosh_publications/handtools7.html

  • The more “Yes” answers the tool has, the better the tool.


Be aware of these signs and symptoms

Be aware of these signs and symptoms:

  • Continual muscle fatigue

  • Sore muscles

  • Numbness

  • Change in the skin color of your hands and fingertips

  • Tingling

  • Swelling in the joints

  • Decreased ability to move

  • Decreased grip strength

  • Pain from movement, pressure or exposure to cold or vibration


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