Ladder trolley and related method

A ladder trolley comprising:

• a trolley frame having an upper end longitudinally spaced apart from a lower end, the trolley frame having
• longitudinally extending first and second side flanges, the first side flange being laterally spaced apart from the second side flange;
• webbing connecting the first and second side flanges;
• and
• a ladder travel channel extending from the upper end to the lower end, the ladder travel channel defined by at least the first side flange, the second side flange, and the webbing, the ladder travel channel being open at the upper and lower ends;
• at least one pair of ladder side rollers moveably connected to the trolley frame, each pair of ladder side rollers having
• a first ladder side roller and a second ladder side roller, the first and second ladder side rollers being laterally moveable and resiliently biased laterally into the channel;
• and
• a payload support connected to the trolley frame, the payload support exterior to the ladder travel channel;
• wherein each pair of ladder side rollers further comprises a linkage assembly, the linkage assembly comprising:
• a first lever arm and a second lever arm, the first lever arm pivotably connecting the first ladder side roller to the trolley frame and the second lever arm pivotably connecting the second ladder side roller to the trolley frame, each lever arm rotatable about a respective pivot, and
• wherein the linkage assembly of each pair of ladder side rollers further comprises:
• a central link having a first link end and a second link end, the first link end connected to the first lever arm at a first longitudinal position and the second link end connected to the second lever arm at a second longitudinal position longitudinally spaced apart from the first longitudinal position, wherein each pivot is provided at a third longitudinal position intermediate the first and second longitudinal positions.