A trolley for moving a load on one or more lines. The trolley has two side plates 10, 12 and multiple sheave assemblies. Each sheave assembly includes an axle that projects from the first plate 10 and a cartridge 20 carried on the axle shaft 34 between the plates. Each sheave cartridge 20 includes a pulley wheel 22 that can rotate on a bearing (24, figure 3) around the axle shaft. The axes of the sheave shafts are parallel to one another. Retention fasteners 42 extend through the second plate 12 to secure the second plate to the first plate 10 through the axle shafts 34. There may be a sheave boss surrounding the axle and the boss may be fixed against rotation relative to the plates. The sheave axle may be secured to a plate by a releasable fastener. There may be two interconnected trolleys where the plates are parallel to each other. Also disclosed is an installation comprising the trolley and a main line that extends between two fixed anchorages. In use, the main line passes between the plates 10, 12 of the trolley and contacts one or more pulley wheels 22 to travel along the line.
System and apparatus for moving objects
2020-09-09
Patent
Elektronische Ressource
Englisch