In a spur-gear chain hoist with a two-chain system, what is the endless chain primarily used for?

In a spur-gear chain hoist with a two-chain system, the endless chain is primarily used to raise and lower the load. This function is fundamental to the operation of the hoist mechanism, as the endless chain loops around the sprockets and engages with the drive system to lift the load effectively. The design allows for smooth vertical movement, enabling the operator to control heavy loads with precision and ease.

The endless chain engages with the hoist's gearing system, allowing mechanical advantages that help lift heavy objects without significant manual effort. This capability is essential in various lifting applications in construction, rigging, and other industrial tasks.

The other options pertain to different aspects of the hoist's operation but do not reflect the primary purpose of the endless chain. For instance, while the hoist might be attached to an anchorage point using other means, and although you might use it in relation to bulky loads or for attachment, the primary function of the endless chain revolves around its role in the lifting process itself.