SAFETY | TECHNOLOGY REPORT


of a hoist. They prevent it and its load approaching too close to a wall or internal structure or building, or to walkway routes which pedestrians may be using. Columbus McKinnon’s Magnetek LaserGuard Mini collision avoidance system, for example, allows distances - such as the layout of the factory walls - to be programmed directly via a PC or tablet into the software, where it is combined


with distance data from the laser sensor device. A dual set-point sensor gives an initial slowdown point, and then a stopping point if the hoist is on a collision course. More advanced options such as their LaserGuard 2 have self-monitoring optical lasers that automatically relay required adjustment information to cranes to prevent crane-to-crane and crane-to-walls collisions.


Since the system is wireless, parameters and active zones can be changed in real time from the plant floor as changing process, plant, or crane conditions require. Where two or more gantry cranes use the same runway sensing systems can detect near approaches and automatically bring one or both cranes to a stop. Demag’s Smart Safety Control system


At 11:30am on July 10, 2021, an employee was using a North American Industrial, 7.5-ton bridge crane to move two stone slabs weighing 800-1000 pounds (360 – 450kg) each across an aisle to consolidate similar product together. The employee was operating the crane using the crane controls. The load was moved into position at the storage rack and lowered. When the load was fully lowered, the Little Giant Lifter, model ALG75, clamp opened as designed. The slabs were still in the upright position when they slipped out of the clamp and fell toward the employee. The slabs struck the employee and killed him.


OSHA accident report number 137102.015 Employee Is Killed When Struck By Stone Slabs


42 | October 2022 | www.hoistmagazine.com


gives independent and continuous monitoring of a crane; it uses a ‘largely redundant’ control concept to bring both cranes to a standstill independently if any irregularities occur. Potentially dangerous conditions can be identified and prevented in advance. The cranes can


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