Date post: | 12-Apr-2017 |
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Business |
Upload: | ergonomics-plus |
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Liberty Mutual MMH “Snook Tables”
Links:Ergonomics Plus Calculator Bernard’s Adapted Tables
• Vertical Location• Floor to Knuckle (below 29”) • Knuckle to Shoulder (29 - 54”)• Above Shoulder (above 54”)
• Frequency • 1 action/8 hours• 1 action/30 minutes• 1 action/5 minutes• 1 action/2 minutes• 1 action/ 1 minute• 1 action/14 seconds• 1 action/9 seconds• 1 action/5 seconds
• Horizontal Distance• 7”• 10”• 15”
• Distance of Lift• 10”• 20”• 30”
Task Variables determined by the assessment:• Vertical Location – floor to knuckle lift (below 29”)• Frequency - average of 1 lift every 2 minutes• Horizontal Distance – 10” (front of body to mid-line of hands)• Distance of Lift – 30” (lifts from height of 4” to 32”= 28”)• Weight of Object – 35 lbs.
Task Variables determined by the assessment:• Vertical Location – Above Shoulder (above 54”)• Frequency - 1 action every 5 minutes (12 actions/hour)• Horizontal Distance – 10” (front of body to mid-line of hands)• Distance of Lift – 30” (lifts from height of 28” to 60”= 32”)• Weight of Object – 28 lbs.
Task Variables determined by the assessment:• Vertical Location – Knuckle to Shoulder (29 - 54”)• Frequency - 1 action every 5 minutes (12 actions/hour)• Horizontal Distance – 15”• Distance of Lift – 20” (lowers from height of 49.5” to 31”= 18.5”)
Weight of Object – 25 lbs.
Task Variables determined by the assessment:• Vertical Location – Knuckle to Shoulder (29 - 54”)• Frequency - 1 action every 30 minutes (2 actions/hour)• Horizontal Distance – 7”• Distance of Lift – 10”• Weight of Object – 30 lbs.
• Carry Point (Vertical Location)• Waist height (elbows bent) • Below Waist Height (elbows straight)
• Frequency • 1 action/8 hours• 1 action/30 minutes• 1 action/5 minutes• 1 action/2 minutes• 1 action/ 1 minute• 1 action/20 seconds• 1 action/10 seconds
• Carry Distance• 7’• 14’• 27’
Task Variables determined by the assessment:• Carry Point –Waist Height• Frequency - 1 carry every 2 minutes (30 actions/hour)• Carry Distance – 27’• Weight of Object = 52 lbs.
Task Variables determined by the assessment:• Carry Point –Waist Height• Frequency - 1 carry every minute• Carry Distance – 27’• Weight of Object = 40 lbs.
• Push/Pull Distance• 7’• 24’• 48’• 97’• 145’• 194’
• Push/Pull Point (Vertical Location)• High (hands about 55”) • Middle (hands about 36”) • Low (hands about 24”)
• Frequency • 1 action/8 hours• 1 action/30 minutes• 1 action/5 minutes• 1 action/2 minutes• 1 action/1 minute• 1 action/30 seconds• 1 action/15 seconds• 1 action/12 seconds• 1 action/6 seconds
• Force Measurement• Initial Force• Sustained Force
Task Variables determined by the assessment:• Pull Point – Middle• Frequency - 1 pull per 5 minutes• Pull Distance – 97’• Initial Force = 53 lbs.• Sustained Force = 25 lbs.
Task Variables determined by the assessment:• Pull Point – Low• Frequency - 1 pull per 2 minutes• Pull Distance – 24’• Initial Force = 75 lbs.• Sustained Force = 34 lbs.
Task Variables determined by the assessment:• Push Point – Middle• Frequency - 1 pull per 1 minute• Push Distance – 97’• Initial Force = 24 lbs.• Sustained Force = 15 lbs.