Internal Ladder Assembly for a Wind Turbine Rotor Hub

An internal ladder assembly for a rotor hub of a wind turbine, the ladder assembly comprising:

• a plurality of platforms spaced apart circumferentially from one another, each platform defining a planar surface extending lengthwise between a first end and a second end, the plurality of platforms including a first platform, a second platform and a third platform;
• at least one first frame member extending outwardly from the first platform;
• at least one second frame member extending outwardly from the second platform;
• and
• at least one third frame member extending outwardly from the third platform,
• wherein each of the at least one first, second and third frame members is oriented at a non-perpendicular angle relative to the planar surface defined by the respective platform from which each of the at least one first, second and third frame members extends.

A rotor hub for a wind turbine, the rotor hub comprising:

• a hub body extending between a forward end and an aft end, the hub body defining a plurality of blade flanges between the forward and aft ends, the hub body further defining a plurality of access ports spaced apart from the blade flanges;
• and
• a ladder assembly extending within an interior of the hub body, the adder assembly comprising:
• a plurality of ladder sub-assemblies, each ladder sub-assembly being positioned at least partially within the interior of the rotor hub so as to be circumferentially aligned with a respective one of the plurality of access ports, each ladder sub-assembly including a first ladder support, a second ladder support and at least one ladder rung extending between the first and second ladder supports;
• a connecting frame extending between each pair of adjacent ladder sub-assemblies so as to couple the adjacent ladder sub-assemblies to one another, the connecting frame extending lengthwise along a reference line defined between the adjacent ladder sub-assemblies;
• and
• at least one foot support member extending from the connecting frame.