A roof hatch ladder with safety cage is a cage built around an workstation to protect the person in it.
In an automibile, the safety cage is that part of the body structure that surrounds and defines the passenger compartment and provides impact and crush protection for passengers during a collision or roll-over.
A safety cage might be built around the operator position of an industrial fork truck, for example, to protect the driver in case the fork truck topples off a loading dock. (Such things do happen).
Another example of a safety cage is the one used by divers who are filming the hunting or mating habits of sharks. The cage prevents any shark from reaching the diver.
Roof Hatches, sometimes called an access hatch, provide easy access to a roof or deck and allow the user to have a weather proof door for quick access to any roof. A Roof Hatch is typically designed to provide access to the roof of a building so equipment may be serviced or replaced and is often required to meet certain specifications or building codes. Roof hatches can be installed in both residential and commercial applications, even though they are most often seen in commercial applications.