Liberty Mutual MMH “Snook Tables”

Links:Ergonomics Plus Calculator Bernard’s Adapted Tables

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• 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.

Task Variables determined by the assessment:• Pull Point – Middle• Frequency - 1 pull per 30 minutes• Pull Distance – 145’• Initial Force = 35 lbs.• Sustained Force = 14 lbs.