Scissor Lifts (Download)
SCISSOR LIFTS Source : http://www.aerialift.com/scissor_lifts.htm 1 What i s a Scissor Lift? An aerial device or elevating work platform used to provide temporary access for people or equipment to inaccessible areas, usually at height Source : http://www.mecaniquetechnipro.com/equipements/nacelles/index.html 2 What is a Scissor Lift? Fueled by either electricity, gasoline, diesel, or propane May be equipped with outriggers for supplementary stabilization Equipped with a platform extension for a larger walking and working space Source : http:// www.diamondtool.net/assets/product_images/pg_2493/pg_2493_0_md.jpg 3 How it Works Pressure is applied to the outside of the lowest set of supports, which then returns an upward force to the rest of the supports. Source: http ://www.locostusa.com/forums/viewtopic.php?f=1&t=11963 4 Scissor Lift Applications Elevates workers to reach heights that would not be practical with extension ladders (from 8’ to 55’) Able to provide multiple workers with a mobile platform and working surface that is easier to move than scaffolding Source: http ://abccreditapplication.info/scissor%20lifts009001.jpg 5 Scissor Lift Applications Can work on either rough terrain such as gravel or dirt, or on finished floors such as concrete. Source: http:// www.billstoolrental.com/tools Source: http://www.graysonline.com/lot/0035-55454/earth-moving-and-mobile-plant/all-terrain-scissor-lift-upright-4wd-model-l-x-41-s-n-1208-mfd-1996-swl 6 Safety Concerns Operating on an uneven surface Encountering holes, debris, and drop-offs while operating at elevation Climbing above or leaning over the 42-inch minimum top rail Overloading and collapsing the boom (using a man-lift as a material crane) Making contact with electrical conductors with an un-insulated portion of the lift 7 Safety Concerns Neglecting to deploy outriggers or brace sufficiently against tip-over Making body contact with electrical conductors or entering the induction field Operating the lift in inclement weather or low visibility conditions Inexperienced or untrained operators Unobserved , uncorrected mechanical or structural defects in equipment 8 Fatalities ( 1990 thru 2007 ) There were 95 construction worker deaths involving scissor lifts that were investigated by OSHA from 1990 thru 2007 There are 26 deaths per year on average involving aerial lifts in industry work Source: Extracted from OSHA Accident Investigation Data 1990-2009 9 Fatality Example A worker was installing a sprinkler system in the auditorium of a movie theater under construction. He was using a self-propelled scissor lift which he was driving with the lift raised to its maximum height of 20 ft. He apparently drove the scissor lift off a 4 in. high ledge. It overturned and the employee fell approximately 25 feet. He was killed. Source: Extracted from OSHA Accident Investigation Data 1990-2009 10 Fatalities in Construction 44 OSHA recorded accidents resulted from : Being caught between scissor lift and building structure Falls from scissor lift platform or guardrail Scissor lift tip-over Electrocution Of these accidents, 33 resulted in fatalities. It is not explicitly stated in the accident details whether or not the remaining 11 were fatal. Source: Extracted from OSHA Accident Investigation Data 1990-2009 11 Applicable OSHA Regulations Scissor lifts are classified by OSHA as scaffolding §1926.452(w ) – Mobile Scaffolds This regulation describes the requirements for bracing members, wheel locks, height limit for manually applied forces, use of outriggers, appropriate power systems, maximum speeds, stabilization measures, and ground leveling requirements 12 Scissor Lift Safety Workers must wear a personal fall-arrest system at all times while in the basket Workers must not ride in the basket unless the scissor lift is travelling on a surface that is within three degrees of level Source : http://www.safetysupplies.com.au 13 Scissor Lift Safety Employees shall always stand on the floor of the basket and shall not sit or climb on the edge of the basket or use planks, rails or other devices for a work position Source : http://safetyrealworldchallenges.blogspot.com/ 14 Scissor Lift Safety Do not overload the lift or use the basket as a material transportation device Exercise extreme caution in the vicinity of overhead power lines or other sources of energy Inspect the machine and its corresponding parts before every use When renting a scissor lift, it is best to first obtain and review all rental and repair records 15 Scissor Lift Safety Source : http://www.rentrain.com/allrental/product.php?id=57942&type=safety 16 Accident Prevention Develop maintenance and documentation procedures for rental yard clients Emphasize the need to document pre-delivery and return inspections Training Only allow licensed and authorized employees to operate the scissor lift Allow time to instruct for safe operation of machinery 17 Think Safety Work Safely 18