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BEST PRACTICES FOR GLOVEBOX ERGONOMICS
Scott Hinds, PECindy Lawton, PT, OCS
Cameron Van [email protected] (505)663-4162
[email protected] (505)667-0252
UNCLASSIFIED
LA-UR 12-22787
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LEARNING OBJECTIVE:
Practices to keep our glovebox workers comfortable and safe while working
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OUTLINE
• Background
• Glovebox Design
• Worker Best Practices and Exercises
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WHY ERGONOMICS?
• Proper work environment Lower stress Less fatigue Improved productivity Decrease risk of Injury
• Decrease risk of a BREACH
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GLOVEBOX INJURY DATA54 people
2006 2007 2008 2009 2010 Jan-June 2011
July-Dec 2011
Jan-June 2012
First Aide 0 0 2 3 3 10 4 0
Recordable 7 10 8 2 6 6 0 1
Shoulder Elbow Wrist Hand/fingers Thumb Spine/other
17 26 5 5 3 5/2
2006-2010 2011- June 2012
Repetitive 88% 58%
Single Occurence 12% 42%
Survey Project for GB workers - Oct 2010 through March 2011
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PERCENTAGE OF WORKERS REPORTING SYMPTOMS VS. YEARS AS A GLOVEBOX WORKER
0
10
20
30
40
50
60
70
80
90
100
Years As a Glovebox Worker
Perc
enta
ge o
f Wor
kers
Rep
ortin
g Sy
mpt
oms
<3 3-5 >5-10 >10-15 >15-20 >20-25 >25
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AVERAGE YEARS AS A GLOVEBOXWORKER VS. NUMBER OF SYMPTOMS PER PERSON
0
5
10
15
20
25
30
Number of Symptoms Per Person
Avera
ge Y
ears
as a
GB
Work
er
0 1 2 3 4 5 6 7
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KEY ERGONOMIC GLOVEBOX DESIGN CONSIDERATIONS
• Depth of glovebox and Width of glovebox• Gloveport height• Windows• Transfer devices, airlocks, and doors• Use of computer simulation
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- Engineering Controls - Design and make engineering changes to improve the situation
- Administrative controls such as task rotation, decreasing duration, training, and exercises can help to buy time until you can do the appropriate engineering change but are NOT the solution
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DEPTH AND WIDTH OF GLOVEBOXTasks should determine size
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GLOVEPORT HEIGHT, SHAPE, AND ORIENTATION
• The ideal height is at operator’s elbows, but that limits reaching distance.
• Ovular ports allow for a greater range of motion.• Depending on the task, gloveports can be horizontal,
vertical, or angled.
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REACH DISTANCE
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Correct
Incorrect
•Using tools helps keep your body in a more neutral position.
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EXTENSION HANDLES
• Extension poles for cleaning windows and paint brushes helps with reach. An angled paint brush helps reaching in corners
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SHOULDER BEST PRACTICES
• Using a platformImproves alignment
of the spine
• Shoulder angle must be below 70 degrees
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SHOULDER BEST PRACTICES CONT’D
Recommended Platform Height (in) Height (in) Shoulder Height (in)
2 68-67 57-55
4 66-63 54-52
6 62 - 58 51 - 47
Platform Height Recommendations(52 in centerline)
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PLATFORMS
• Platforms help decrease stress on the neck and shoulders.
• Important that size fits just between two ports, easily portable (wheels)
• Shoulder below 70 degrees
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SHOULDER STRESS
Crease
Wear
Breach
Poor Ergonomics
Injury Risk
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SOLUTION
Retractable shelf for airlock
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WINDOWS• When the
visual field is impaired, so is productivity and dexterity.
• Full view windows are ideal
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Shielding on windows decreases clarity.
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COMPUTER SIMULATION
• Use early on in the design process
• Identifies ergonomic stressors
• Reassess/validate changes
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COMPUTER SIMULATION CONT’D
• Graded approach to ergonomic stressors
(red, orange, yellow, green)
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COMPUTER SIMULATION
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Identifies clearly the viewing by the operator
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WORKER BEST PRACTICES
• Shoulder• Elbow• Lower back and neck
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SHOULDER BEST PRACTICES
• Pull fingers free• Extract with
elbow angled down -improves muscle imbalances
UNCLASSIFIED
Removing arms from glovebox gloves
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SHOULDER BEST PRACTICES CONT’D
• Ideally - Use reach assist tools
• Place hand to inner surface of front panel to reduce stress on reaching shoulder and improve reach distance
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ELBOW BEST PRACTICES CONT’D
• Proper grasping techniques
• Do not reach over the top and grab/move items – a lot of stress on elbow
Improper technique Proper techniques
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ELBOW BEST PRACTICES CONT’D
Power Grip vs. Pinch Grip
• Avoid pinch grip/ use a more open hand power grip
• Design tooling to reduce pinching
• Use foot controls vs. hand controls.
Improper technique Proper technique
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ALLEN WRENCHES
Enlarged handles…• make wrenches easier to
grab and hold.
• help avoid Pinch grip.
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REVERSE LOCKING TWEEZERS
• The fatigue from holding tweezers closed is eliminated.
• The length reduces the need to reach.
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LOWER BACK AND NECK BEST PRACTICES
• Anti-fatigue mats
• Help reduce lower back and leg fatigue
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LOWER BACK
• Move items closer prior to lifting
• Reduce lifting by improved housekeeping
• Items that weigh over 15 lbs in a glovebox need an assistive device to move
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EXERCISES
• Traffic cop:
Helps with upper back stress and shoulders
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SHOULDER EXERCISES
• Strengthening exercises
• Rotator cuff• Internal
Rotation• External
Rotation• Rhomboids
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ELBOW EXERCISES
• Stretching exercises
• Should be done throughout the day
10 – 15 second holds
Stretching forearm flexors Stretching forearm extensors
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Summary
• Improve Designs
• Use appropriate tooling.
• Improve techniques.
• Strengthen Rotator Cuff and stretch forearms
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Thank you.
Questions
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