Coffing hoist is a well-known chain hoist brand used as a generic term for similar lifting devices. Hoists can be manual or powered, and work by shortening or lengthening a chain link to lift or lower a block. Coffing hoists are reliable, safe, and require little maintenance. Manual hoists use a lever or continuous chain link to drive the mechanism, while motorized hoists use an electric or compressed air motor. Controls for motorized hoists are suspended from the hoist casing on a flexible cable for safe operation.
Coffing hoist is the trade name of a well-known group of chain hoists. The name, however, has been used by many as a generic description for all similar lifting devices. Hoists can be manually operated or powered by an external power source and all use a system of gears and ratchets that lift a block suspended on a chain. Hand hoist designs are usually operated by a lever or continuous link of chain which drives the lifting mechanism via a gear, while powered variants are usually operated by an electric or compressed air motor.
The coffing hoist family of chain hoists is one of the best known in a wide variety of industries. The name has become synonymous in many circles with chain hoists in general, with other brands generically referred to as coffing hoists. Available in a full range of load capacities and drive configurations, the coffing hoist is a simple, reliable and safe lifting solution that requires little maintenance and operator skill.
Most chain hoists work on the principle of shortening or lengthening a chain link on which a block is suspended. When the ring is stretched, the block and any cargo it carries will descend. As the ring is shortened, the block and load are lifted, achieved by having one end of the ring fixed to a static point within the tackle housing while the other end is attached to a guided furling spool. The exposed link of chain underneath the hoist housing passes around a loose spool gear located inside the block.
When the hoist is activated, the take-up reel, depending on which direction it is driven, will wind or unwind the chain around its pin. This has the effect of shortening or lengthening the exposed chain link. Thanks to the free spool gear in the block, it does not move along the chain in a fixed position, but rather moves up or down at the apex of the loop as it lengthens or shortens. This accordingly provides the lifting or lowering action of the hoist.
Both manual and motorized hoists are available, but they work in different ways. Hand-operated winch designs may use a lever to drive the take-up reel or a separate, continuous link of chain that drives the reel via a gear on one end. A selector is used to set the hitch to lower or raise the load. Motorized hoists work in a similar way and use an electric or compressed air reversible motor to drive the mechanism. The controls for the motor are typically suspended from the hoist casing on a flexible cable which allows the hoist operator to control operations from a safe position.
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