Trolley or Crab - The 'crab' is the 'cross travel unit' from which the hook is lowered and raised. A top-running trolley on a double girder crane runs on rails.
Sizes range from the smallest jib cranes, used inside workshops, to the tallest tower cranes, used for constructing high buildings. Mini-cranes are also
There are generally three levels of limit switches recommended for in electric chain hoists: • The hoist drive shall have a rotary limit switch driven from the
