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Copyright EASE Inc Tutorials© 1986-2002
Basic Industrial Basic Industrial ErgonomicsErgonomics
Basic Industrial Basic Industrial ErgonomicsErgonomics
An EASEworks® Manufacturing TutorialAn EASEworks® Manufacturing TutorialAn EASEworks® Manufacturing TutorialAn EASEworks® Manufacturing Tutorial
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Scope of this TutorialScope of this TutorialScope of this TutorialScope of this Tutorial
This tutorial will give Industrial and Manufacturing Engineers an understanding of the basic concepts of ergonomics, known risk factors, methods of analyzing tasks, and suggested ways of reducing risk in an industrial or warehousing environment.
Ergonomics is an ‘inexact science’ and the results of some method analyses can be open to interpretation. However ‘a little common sense’ goes a long way.
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ContentsContentsContentsContents
What is Ergonomics Understanding Ergonomic Risk Analyzing & Recognizing Ergonomic Problems Reducing the Risk Work Station & Tool Check Lists New Product Design
EASE Contact Information
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What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
A study of the relation between people and their work environment.
Is used to prevent injuries and illnesses associated with the design of physical work.
Is used to increase employee safety and comfort and to optimize work performance and quality.
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What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
The term ‘ergonomics’ comes from the Greek words ergon (work) and nomos (law).
Too often ergonomics is only applied because of the ‘Law’.
Ergonomics should be seen as a ‘win/win’ opportunity to improve productivity and quality while increasing employee safety and morale.
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What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics? Reactive Ergonomics – is where you respond to a
work place complaint or injury.
Reactive Ergonomics – is where you respond to a work place complaint or injury.
Proactive Ergonomics – is where you analyze a proposed task at design time to prevent an injury.
A real world ergonomics program should include both analyses. But due to constraints of time and staffing not every task can or indeed needs to be analyzed.
Good work station & tool design will prevent a lot of problems whatever the task.
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Stretching to reach Repeated heavy lifting High pinch forces Handling objects that are sharp, very hot, or very cold. Working with hands above shoulders Long periods of work without a change in body posture.
Examples of work requirements that can cause discomfort, fatigue, injury, and illness are:
What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
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Is to make the work fit the operator, not make the operator fit the work.
The Goal of ErgonomicsThe Goal of ErgonomicsThe Goal of ErgonomicsThe Goal of Ergonomics
What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
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Fatigue Pain Illness – sprains, back ache, etc Low morale Frustration & Irritation
Poor Quality Absenteeism Higher costs Higher employee turnover &
training
Effects on the OperatorEffects on the OperatorEffects on the OperatorEffects on the Operator Effects on the CompanyEffects on the CompanyEffects on the CompanyEffects on the Company
And why do we need it?And why do we need it?And why do we need it?And why do we need it?What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
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Higher productivity Higher Quality Reduced operator injury Increased morale Greater job satisfaction Lower medical & insurance costs Reduced lost time Lower absenteeism Less employee turnover
And what is the benefit?And what is the benefit?And what is the benefit?And what is the benefit?What is Ergonomics?What is Ergonomics?What is Ergonomics?What is Ergonomics?
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Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
Physical Activity Fatigue Physical Exertion Fatigue & Recovery Overexertion & Cumulative Trauma Body Type
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Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
It is important to note that occasional exposure to a risk factor is not usually harmful.
Significant exposure to a risk factor may be harmful to sections of the population.
You can’t specify the physique, age, sex of the operator.
Ergonomic analysis tools are going to be based on 95% of the working population being able to do the work.
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Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
Our bodies use energy from the food we eat to meet two kinds of physical demands.
Internal demands are the processes which maintain life and growth within our bodies.
External demands are the physical activities which we perform during our waking hours
Internal:Internal: Cell Growth: Digestion: Circulation: Respiration etc.
External:External: Walking: Lifting: Standing: Exercising: etc
How the Body uses EnergyHow the Body uses EnergyHow the Body uses EnergyHow the Body uses EnergyPhysical ActivityPhysical ActivityPhysical ActivityPhysical Activity
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Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
If activities exceed our personal limits of stamina or strength (and this varies from person to person), then two kinds of fatigue may result
Localized fatigue:- effects the particular part of the body that is working, for example the arms.
Whole – body fatigue occurs when several body parts are over exerted.
FatigueFatigueFatigueFatigue
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Is either dynamic or static.
Dynamic exertion is where there is visible movement of the body.
Static exertion is where the body or part of the body is held in place.
Static exertion is often more tiring because the muscles have no chance to recover.
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
Physical ExertionPhysical ExertionPhysical ExertionPhysical Exertion
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The amount of force you use in an exertion and the length of the exertion both effect how soon and how much fatigue will set in.
Localized fatigue is best relieved by changing activities to rest working muscle groups or by resting the working limb.
Whole body fatigue is best reduced by reducing the level of body activity or by resting the body.
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
Fatigue and RecoveryFatigue and RecoveryFatigue and RecoveryFatigue and Recovery
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If an operator works in an activity that exceeds their strength or stamina, then overexertion injuries and cumulative trauma injuries are possible.
Overexertion can cause immediate injuries to muscles, tendons and ligaments. Such as sprains, strains and tears.
Cumulative Trauma injuries are of the ‘wear and tear’ type and include damage to hands, wrists, shoulders, elbow and some back disorders
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
OverexertionOverexertionOverexertionOverexertion
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Stamina Strength Height Weight
The working population varies in age, sex, health and size.
In most western countries you can’t specify the age, sex, fitness or size of the operator.
Proportions Vision Hearing
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
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Frequent Hand Use Arms Extended Bending & Twisting Static Body Posture Using Force Vibration Contact Stress Temperature Noise Fatigue
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
Risk FactorsRisk FactorsRisk FactorsRisk Factors
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Risk Activities may occur at work, and may occur at home. Consider the body posture, force requirement and hand grip when bowling or hanging washing on a line.
When walking a factory, you can often tell the physically demanding tasks by the operators performing them. Big, buff, men! But consider who will get the blame (and cost) for operator injury if ‘Big Bill’ hurt his back at home, and now has to do his physically demanding tasks?
The work has to fit the operator, not the operator the work!
Things to considerThings to considerThings to considerThings to consider
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
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Tasks often have multiple Risk Factors
To analyze the task, multiple assessments have to be done to cover Force, Repetition, Posture, Fatigue
The task time is important. If risk is found, any proposed solutions must take into account manufacturing cycle time requirements, and of course
COSTCOST.
Things to considerThings to considerThings to considerThings to consider
Understanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic RiskUnderstanding Ergonomic Risk
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Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
Posture Force Repetition
We need to know how much force is involved for each body posture, how often is it repeated, for how long is it held, how often is the total task repeated and for how long the task is worked.
Ergonomic Analysis MethodsErgonomic Analysis MethodsErgonomic Analysis MethodsErgonomic Analysis Methods
Fatigue & Recovery Employee Survey
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
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Analyzing a video of the task is the best way to make ergonomic analyses of a task
Analyzing a video of the task is the best way to make ergonomic analyses of a task
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
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Since you obviously can’t assemble anything without the use of hands and fingers we have to be concerned with the position of the hands, the type of grip forces involved, vibration, pressure, temperature and the number of repetitions.
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and Fingers
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing ProblemsAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Pronation – thumb down, turning the wrist over 45 degrees
Supination – thumb out, palm up. Turning the hand palm up over 20 degrees
Ulnar Deviation – twisting hand outwards over 15 degrees
Exceeding these angles may cause problems when used in conjunction with high repetition and/or force.
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and Fingers
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing ProblemsAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Radial Deviation – twisting the hand inwards over 10 degrees
Flexation – bending hand forward over 45 degrees
Extension – raising hand backward over 40 degrees
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and Fingers
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing ProblemsAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Keep the hand in a neutral posture.
Minimize forces required to operate.
Minimize vibration
Have padded handles
Tool design is crucial. Tools need to be designed to:
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and Fingers
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing ProblemsAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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A wrap or power grip is best.
Pinch forces over 7lbs can cause injury.
Hook and contact grasps expose the operator to the potential of contact stress with sharp, or hard objects.
Using the hand(or any body part) to strike objects obviously isn’t recommended, but you do see it, as an operator ‘slaps’ something into place.
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Twisting or Bending of the Wrists – effects the median nerve passing through the carpal tunnel which can lead to carpal tunnel syndrome.
Repetitive Hand & Wrist Motions – effects the tendons passing through the carpal tunnel which can lead to tendinitis/tenosynovitis.
Vibration – effects the blood vessels in the fingers which can lead to Raynaud’s Phenomenon.
Pinch grips can lead to contact stress and overexertion of the hands.
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Posture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersPosture - Constant Use of Hands and FingersAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Arms ExtendedWorking with the arms above the shoulder can lead to the compression and entrapment of nerve in the shoulder. It also causes fatigue to the muscles of the shoulder and arm.
Arms ExtendedWorking with the arms above the shoulder can lead to the compression and entrapment of nerve in the shoulder. It also causes fatigue to the muscles of the shoulder and arm.
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Arms and ShouldersArms and ShouldersArms and ShouldersArms and ShouldersAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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ARM AND SHOULDERWorking with the elbows abducted at an angle of 25 degrees or more can lead to the compression and entrapment of nerves in the shoulder. It is also causes fatigue to the muscles of the shoulder and arm.
ARM AND SHOULDERWorking with the elbows abducted at an angle of 25 degrees or more can lead to the compression and entrapment of nerves in the shoulder. It is also causes fatigue to the muscles of the shoulder and arm.
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Arms and ShouldersArms and ShouldersArms and ShouldersArms and ShouldersAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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Horizontal reach over 25 inches (62.5cm) is greater than the reach of 5% of the female population without bending. A vertical reach of over 70 inches(175cm) is above the reach of 5% of the female population
The longer the reach, the greater effect of any weight involved. The more off center the reach, the greater effect of any weight involved.
Horizontal reach over 25 inches (62.5cm) is greater than the reach of 5% of the female population without bending. A vertical reach of over 70 inches(175cm) is above the reach of 5% of the female population
The longer the reach, the greater effect of any weight involved. The more off center the reach, the greater effect of any weight involved.
Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Arms and ShouldersArms and ShouldersArms and ShouldersArms and ShouldersAnalyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks
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The best position for assembly work is with the arms to the front, elbows close to the body, at a vertical height between the operators chest and thigh. Moving the arm across the midline of the body should be avoided.
The best position for assembly work is with the arms to the front, elbows close to the body, at a vertical height between the operators chest and thigh. Moving the arm across the midline of the body should be avoided.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Arms and ShouldersArms and ShouldersArms and ShouldersArms and Shoulders
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The lower the reach, the greater effect of any weight involved.
The more off center the reach, the greater effect of any weight involved.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Bending and TwistingBending and TwistingBending and TwistingBending and Twisting
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In general twisting, bending and leaning of the torso should be avoided. Repetition with weight in a poor body posture may cause injury in a significant percentage of the population.
In general twisting, bending and leaning of the torso should be avoided. Repetition with weight in a poor body posture may cause injury in a significant percentage of the population.
The risk angles are leaning more than 5 degrees, twisting more than 15, and bending more than 60.
The risk angles are leaning more than 5 degrees, twisting more than 15, and bending more than 60.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Bending and TwistingBending and TwistingBending and TwistingBending and Twisting
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Bending & Twisting also applies to the neck.In general neck side bending or held in a twisted position is to be avoided.
Bending & Twisting also applies to the neck.In general neck side bending or held in a twisted position is to be avoided.
Bending the neck back further than 5 degrees or forward further than 20 should also be avoided
Bending the neck back further than 5 degrees or forward further than 20 should also be avoided
Use of head protection such as a welding mask needs to be accounted for in any fatigue assessment
Use of head protection such as a welding mask needs to be accounted for in any fatigue assessment
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Bending and TwistingBending and TwistingBending and TwistingBending and Twisting
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The operator needs to be in a balanced posture.
The effects of repetition and force will be increased detrimentally due to poor posture!
The operator needs to be in a balanced posture.
The effects of repetition and force will be increased detrimentally due to poor posture!
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
PosturePosturePosturePosture
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Methods that analyze body posture include:-
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
PosturePosturePosturePosture
RULA – Rapid Upper Limb Assessment. REBA – Rapid Entire Body Assessment. NIOSH 91 – Takes Body Posture into Account.
There are other methodologies. The screens shown earlier are based on RULA.
NoteNote: This tutorial does not explain how to use RULA.
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Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
PosturePosturePosturePosture
.
The task shown here has two RULA action level 4’s, meaning that an immediate change in method is suggested
The task shown here has two RULA action level 4’s, meaning that an immediate change in method is suggested
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Lifting Pushing Pulling Carrying Pinch Force Holding in place
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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The most frequently used lifting analysis in the USA is the NIOSH91 guide.
This has a maximum weight of 51 lbs (23kg)
It mainly uses weight and body posture to determine a lifting index for the 5% female.
This screen shows input for NIOSH91, as well as for the Alpha analysis
This screen shows input for NIOSH91, as well as for the Alpha analysis
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
LiftingLiftingLiftingLifting
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An index of 1 or less is ideal, but may be unrealistic. What % of your workforce are 5% female
Some companies are OK with a 2 or below
This screen shows the results of a NIOSH91 analysis of a given lift
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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Whilst NIOSH91 focuses on the entire body, the analysis shown here gives results for strength, fatigue and recovery by back, shoulder, elbow and hand.
A 4 means that 95% of the working population can’t do the task without risk of injury.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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By using the tools available you can see areas of concern
Rule of thumb – as you increase the weight of a lift (50 lb max) the more neutral you must keep the body posture.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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Space constraints Available rest between lifts Capability of the employee
skill in handling loads past injuries
Note:Note: The affectivity of safe lifting techniques has been questioned. “Proper lifting’ is not a substitute for a well engineered work place. Loads that can be lifted by the legs from a squat can exceed the capacity of the lower back. Other variables that can effect the degree of difficulty in lifting loads safely are:
Size (bulk) of load Floor/shoe traction Stability of load Adequacy of grip Distance to carry
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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Pushing is better than pulling (less strain on back).
Pushing can be split into whole body or arms only.
Suggested standing force limits are 50lbf using 2 hands.
A 2 wheel manual cart should not be loaded with >250lb or 114 kg.
3 or 4 wheel manual cart should not be loaded with >500lb or 228kg
Pushing can be split into whole body or arms only
Suggested force limits are 24lbf using 2 hands.
PushingPushingPushingPushing PullingPullingPullingPulling
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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Pinch forces of over 2lbs (1 kilo) are generally considered to have injury potential
Carrying loads greater than 50 lbs is to be avoided.
The load should be kept close and near waist level
The load should have handles
Pinch ForcesPinch ForcesPinch ForcesPinch Forces CarryingCarryingCarryingCarrying
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForceForceForce
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Holding a force in place is very fatiguing as the muscles don’t get to rest and recover
Hold in PlaceHold in PlaceHold in PlaceHold in Place
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForce
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Causing fatigue if insufficient recovery time
Compounding the effects of force
Compounding the effects of poor body posture
A ‘no significant weight’ assembly task where all parts are under a pound canstill have risk if the repetitions are highenough.
In tasks with a less than 30 second cycletime, more than 1500-2000 similar handmotions per hour can lead to injury
RepetitionRepetitionRepetitionRepetitionAffects by:
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
ForceForce
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Localized fatigue can be analyzed as we have seen with tools like the Alpha analysis. Whole body fatigue can be analyzed by using a Kilo Calorie Analysis or an industrial engineering tool such as a PF&D (Personal Fatigue & Delay) analysis
Localized fatigue can be analyzed as we have seen with tools like the Alpha analysis. Whole body fatigue can be analyzed by using a Kilo Calorie Analysis or an industrial engineering tool such as a PF&D (Personal Fatigue & Delay) analysis
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Fatigue and RecoveryFatigue and RecoveryFatigue and RecoveryFatigue and Recovery
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Don’t ignore the operator. Not only will they tell you where a task causes discomfort, but often they have thought of ways of alleviating it.
Don’t ignore the operator. Not only will they tell you where a task causes discomfort, but often they have thought of ways of alleviating it.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
Employee SurveyEmployee SurveyEmployee SurveyEmployee Survey
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Employee SurveyEmployee SurveyEmployee SurveyEmployee Survey
Compare the results of your ergonomic analyses with the survey.
Compare the results of your ergonomic analyses with the survey.
Analyzing TasksAnalyzing TasksAnalyzing TasksAnalyzing Tasks Recognizing ProblemsRecognizing ProblemsRecognizing ProblemsRecognizing Problems
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Design each work station – follow a checklist Use ergonomically designed tools – follow a checklist Have work instructions and ensure the operator follows them Do an analysis of the task
The BasicsThe BasicsThe BasicsThe Basics
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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Constant use of hands & fingers – rotate to jobs where hand use is lower.
Arms extended & unsupported – alter the design of the work station to bring the work closer. Don’t work above shoulders, don’t require elbow abduction (elbows up).
Bending & Twisting – reposition the objects to the front of the worker at an appropriate height
Using significant force – reduce the weight of the load if possible, keep the body in neutral postures, use assisted lifts, reduce pinch forces, use power grips, minimize lift distance.
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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Static body posture – alternate between standing and sitting, rest one foot on a support while standing
Vibration – isolate body from vibration source, rotate to non vibrating job, use better designed tools
Contact Stress – cushion exposed body parts (eg gloves), pad hard or sharp objects, round or smooth rough edges
Heat/cold – limit exposure to temperature extremes, provide heating/cooling systems, provide protective clothing
Noise – use hearing protection, reduce exposure to high noise levels.
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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Lifting – provide handles, allow large containers to tilt or have collapsible sides, raise tote bins to appropriate height
Holding in place – provide clamps or fixtures
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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Can you cost justify it? Have you made productivity improvements? Is the new cycle time better or worse? Is that acceptable?
But is management going to buy off on it?But is management going to buy off on it?But is management going to buy off on it?But is management going to buy off on it?
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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This solution using a lifting arm while greatly reducing the risk has added 8 seconds to the cycle time
Does it matter?
This solution using a lifting arm while greatly reducing the risk has added 8 seconds to the cycle time
Does it matter?
Reducing the RiskReducing the RiskReducing the RiskReducing the Risk
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Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists
The use of work station and tool design check lists will go a long way in alleviating ergonomic problems.
If your answers are negative, fix them if possible
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Does the work space accommodate the smallest employee reach to the largest employee clearance? (No=Bad)
Are work surfaces and chairs adjustable? (No=Bad)
Does the work keep the operator immobile? (Yes=Bad)
Requires handling of large bulky materials regardless of weight? (Yes=Bad)
Is the floor slippery? (Yes=Bad)
Is matting provided? (No=Bad)
Does the work space accommodate the smallest employee reach to the largest employee clearance? (No=Bad)
Are work surfaces and chairs adjustable? (No=Bad)
Does the work keep the operator immobile? (Yes=Bad)
Requires handling of large bulky materials regardless of weight? (Yes=Bad)
Is the floor slippery? (Yes=Bad)
Is matting provided? (No=Bad)
Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists
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Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists
Does the work require eye focus at differing distances? (yes=bad)
Is lighting adequate? (no=bad)
Are noise levels less than 85 dbA for ambient and less than 140 dbA for impact? (no=bad)
Is humidity in the range 20 to 85? (no=bad)
Is temperature in the range of 66-79F for light work, 64-74F for medium and 60-68F for heavy? (no=bad)
Does the work require eye focus at differing distances? (yes=bad)
Is lighting adequate? (no=bad)
Are noise levels less than 85 dbA for ambient and less than 140 dbA for impact? (no=bad)
Is humidity in the range 20 to 85? (no=bad)
Is temperature in the range of 66-79F for light work, 64-74F for medium and 60-68F for heavy? (no=bad)
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Are there peak loads of muscular effort? (yes=bad)
Frequent or extreme lifting requirements? (yes=bad)
Excessive pushing, pulling or carrying? (yes=bad)
Is material manually moved over long distances? (yes=bad)
Are there extended reaches? (yes=bad)
Are there peak loads of muscular effort? (yes=bad)
Frequent or extreme lifting requirements? (yes=bad)
Excessive pushing, pulling or carrying? (yes=bad)
Is material manually moved over long distances? (yes=bad)
Are there extended reaches? (yes=bad)
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Could loads be reduced by using more frequent, lighter loads?
Can Lifting Aids be used?
Can the lifting be replaced by sliding?
Are hand holds or handles available? (No=Bad)
Does the job exceed the capabilities of most employees? (Yes=Bad)
Could loads be reduced by using more frequent, lighter loads?
Can Lifting Aids be used?
Can the lifting be replaced by sliding?
Are hand holds or handles available? (No=Bad)
Does the job exceed the capabilities of most employees? (Yes=Bad)
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Is the operator working with the neck bent further than 15-20 degrees? (Yes=Bad)
Are the wrists bent or flexed? (Yes=Bad)
Are there twisting motions of the wrist? (Yes=Bad)
Are the arms outstretched? (Yes=Bad)
Is the work required above the shoulder? (Yes=Bad)
Are most reaches to the front of the operator? (No=Bad)
Is the operator working with the neck bent further than 15-20 degrees? (Yes=Bad)
Are the wrists bent or flexed? (Yes=Bad)
Are there twisting motions of the wrist? (Yes=Bad)
Are the arms outstretched? (Yes=Bad)
Is the work required above the shoulder? (Yes=Bad)
Are most reaches to the front of the operator? (No=Bad)
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Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists Is the body leaning
forward? (Yes=Bad) Is there excessive twisting
or stretching? (Yes=Bad) What are the cycle time
requirements of the task? Is this a high volume task? Is the operator sweating?
Having problems keeping up? (Yes=Bad)
Would you like to do this task? Every day? (No=Bad)
Could you do this task? Every day? (No=Bad)
Is the body leaning forward? (Yes=Bad)
Is there excessive twisting or stretching? (Yes=Bad)
What are the cycle time requirements of the task?
Is this a high volume task? Is the operator sweating?
Having problems keeping up? (Yes=Bad)
Would you like to do this task? Every day? (No=Bad)
Could you do this task? Every day? (No=Bad)
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Is this the right tool for the task? (no=bad)
Has wrist flexing been eliminated? (no=bad)
Can the tool be used in either hand? (no=bad)
Are operator’s elbows close to the body? (no=bad)
Are dual handles 120 degrees apart? (no=bad)
Does it permit a full grasp? (no=bad)
Is the handle long enough? (no=bad)
Is it easy to hold? (no=bad)
Is this the right tool for the task? (no=bad)
Has wrist flexing been eliminated? (no=bad)
Can the tool be used in either hand? (no=bad)
Are operator’s elbows close to the body? (no=bad)
Are dual handles 120 degrees apart? (no=bad)
Does it permit a full grasp? (no=bad)
Is the handle long enough? (no=bad)
Is it easy to hold? (no=bad)
Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists
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Copyright EASE Inc Tutorials© 1986-2002
Work Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check ListsWork Station & Tool Check Lists
Is the handle oval shaped? (no=bad)
Does it have plastic on it ? (no=bad)
Are all the fingers used to trigger it? (no=bad)
If not, is the thumb? (no=bad) Is it easy to trigger? (no=bad) Has vibration been minimized?
(no=bad)
Is the handle oval shaped? (no=bad)
Does it have plastic on it ? (no=bad)
Are all the fingers used to trigger it? (no=bad)
If not, is the thumb? (no=bad) Is it easy to trigger? (no=bad) Has vibration been minimized?
(no=bad)
Tool DesignTool DesignTool DesignTool Design
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New Product DesignNew Product DesignNew Product DesignNew Product Design
New products should not be designed solely for function, but also for assembly.
Part of DFA (Design for Assembly) is accounting for ergonomics.
EASE, Inc has integrated software modules that reflect this belief.
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New Product DesignNew Product DesignNew Product DesignNew Product Design
New products are designed in a DFA module that uses standard touch labor data as part of the process.
When a beta design is ready, it can be transferred to a routing system, standards in place by operation for the addition of material handling data (where parts are in relation to the work station & operator, that may not be known at design time) and input of manufacturing engineers.
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Copyright EASE Inc Tutorials© 1986-2002
The process plan is then transferred to line balancing to ensure that different production schedules can be met.
Each station for a new process, should have an ergonomic review done proactively.
If problems surface at this stage, the beta design can be sent back for revision.
Once the design is acceptable, work instructions can be added to the routing, and we are ready for production.
New Product DesignNew Product DesignNew Product DesignNew Product Design
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Thank you for viewing this tutorial. Thank you for viewing this tutorial.
For further information about EASE For further information about EASE Inc, our clients, consulting services, Inc, our clients, consulting services, software products and software software products and software customization, or to end this tutorial, customization, or to end this tutorial, please select from the buttons at left.please select from the buttons at left.
Thank you for viewing this tutorial. Thank you for viewing this tutorial.
For further information about EASE For further information about EASE Inc, our clients, consulting services, Inc, our clients, consulting services, software products and software software products and software customization, or to end this tutorial, customization, or to end this tutorial, please select from the buttons at left.please select from the buttons at left.
EASE Inc.EASE Inc.
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Copyright EASE Inc Tutorials© 1986-2002
EASE IncorporatedEASE Incorporated is an international corporation, founded in 1986.
EASEEASE is headquartered in Southern California with satellite offices in Europe and the United States.
EASE IncorporatedEASE Incorporated provides productivity improvement services through the application of the EASEworks®EASEworks® Software, training, consulting services and implementation support.
Who is EASE Inc?Who is EASE Inc?Who is EASE Inc?Who is EASE Inc?
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EASE CustomersEASE CustomersEASE CustomersEASE Customers
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Copyright EASE Inc Tutorials© 1986-2002
The ServiceThe ServiceThe ServiceThe ServiceOur major focus is to offer sustainable productivity improvements and cost reductions for our clients. We can provide you with consulting assistance for. .
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Equipment Evaluation
Facility Layout
Establishing “Best Practices”
Competitive Benchmarking
Design Engineering
Process Engineering
Production Engineering
Implementing Ergonomic Improvements
Training and Training Support & Certification
Improving Labor Efficiency
Productivity Analysis
Implementing Lean Manufacturing
Manufacturing Engineering
ISO 9000 Implementation
Developing Work Standards
Process Mapping
EASE will provide engineers with extensive experience in YOURYOUR industry. Your engineers will have the ability to take over, with confidencewith confidence, where we leave off.
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Copyright EASE Inc Tutorials© 1986-2002
SoftwareSoftwareSoftwareSoftwareEASEworks® Software modules cover:
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Work Standards Product Cost Estimating Line Balancing
Work Instructions Ergonomics Design For Assembly
EASE Inc. provides full training, start up assistance and consulting services for all modules.
Software customization services are also available.
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Copyright EASE Inc Tutorials© 1986-2002
Phone:Phone:
Fax:Fax:
E-Mail:E-Mail:
Web:Web:
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(949) 348-7511
(949) 367-9906
www.easeinc.com
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Contact InformationContact InformationContact InformationContact Information
EASE IncEASE Inc.
27405 Puerta Real, #380
Mission Viejo, CA 92691
EASE IncEASE Inc.
27405 Puerta Real, #380
Mission Viejo, CA 92691