Cranes 101: Overhead Crane Hoist Suspension Types
Continuing out series of the basics of cranes, today we’re covering the suspension types of overhead cranes hoists. Afterall,
Hook Mounted Crane Hoists
With a top hook on the crane hoist frame/body, the hook mounted crane hoist can be suspended hoist from the clevis or suspension pin of a trolley; or a fixed suspension device that is mounted on a beam or the structural framework of a building. Hook mounted crane hoists typically have welded link load chain or roller load chain as the lifting medium.
Lug Mounted Crane Hoists
Lug mounted crane hoists are characterized by a lug mounting attached to the top of the hoist frame or sometimes a lug mounting attached as an integral part of the hoist frame. These mountings are used to suspend the hoist from a trolley, a fixed suspension device mounted on a beam, or the actual structure of a building.
Trolley Mounted Crane Hoists
Trolley mounted crane hoists are hook mounted, clevis mounted or lug mounted crane hoists suspended from a trolley or trolleys. Sometimes the crane hoist has an integral trolley as part of the hoist frame, that allows travel motion on the lower flange of a monorail beam, or the lower flange of the bridge beam of an overhead crane.
Hand Chain Operated Trolleys
Hand chain manually operated trolleys work as the operator grasps and pulls a continuous hand chain suspended from the trolley. Hand chain consists of a series of interwoven formed welded or unwelded links according to the design specifications of the hand chain. As the operator pulls the hand chain, the hand chain wheel turns and transmits power through gearing to the trolley wheels.
Trolley Crane Hoists
Trolleys allow traverse motion of the hoist unit and load being handled, by traveling: on the lower flange of a monorail beam; on the lower flange of a bridge beam of an overhead crane; or on top of the bridge beams of an overhead crane.
Plain Trolley Crane Hoists
The travel motion of plain type trolleys is obtained by pulling or pushing the load or by some other means, such as the strain relief of a pendant control, suspended from the trolley or hoist. Plain type trolleys are recommended where trolley motion is infrequent or relatively short.