См.:
Unfortunately, there have been cases of caged ladders being misused and actually contributing to falls. One of the most common unsafe practices is for a climber to lean back against the cage to free up a hand and allow them to hold tools while climbing down. This technique is the reason ladder cages are often referred as “back scratchers”. During one occasion, a worker who was unaware of his exact location on the ladder attempted to lean back against the cage. He misgauged his position and attempted to lean at the bottom of the ladder where the cage no longer existed (cages end 7’-8’ from the ground or platform). As a result, the worker fell over the railing of the landing platform and suffered fatal injuries.
http://blog.protectionfall.com/category/fall-protection-equipment-2/+ см.:
back scratcher
http://www.divinglore.com/Offshore_Slang.html Еще на близкую тему поищите fall arrest / fall arrester / fall arrestor со словами system, equipment и др.
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