What is a choker hook used for?
A choker hitch is used to tighten or snug a sling down securely to provide greater load control. When using a choker hitch, one eye of the hitch is wrapped around the load and then passed through itself and then attached to the crane or hoist hook.
What is a logging choker?
A choker setter or choke setter is a logger who attaches cables to logs for retrieval by skidders or skylines. The work process involves the choker setter wrapping a special cable end (choker) around a log and then moving clear so the yarding engineer (e.g. skidder operator) can pull the log to a central area.
What percentage does a choke weaken a sling?
Choker – Due to the stress created at the choke point, slings rigged with this hitch achieve only about 75% of their potential capacity.
How do you use a cat choker?
Property owners, farmers, contractors, and loggers all utilize cat chokers. To use a cat choker, you must place the nub into the choker bell. This creates a choking pressure around the log. It is perfect for skidding or moving logs.
What is the proper included angle of a choker?
As the horizontal sling angle increases you will be putting more pulling stress on the choke. It’s best to keep your sling angle above 60° off the horizontal. Do not go below 45°!
What does EWL mean on a sling?
Effective Working Length (EWL) is the length between the load bearing points of an unloaded lifting sling or chain sling. Effective length of a one-legged lifting sling with two components.
Why is a double wrap choker hitch better than a single wrap choker hitch?
As can be seen, a standard choker hitch compresses the load from three sides only. A better way to do the same lift: use a double wrap choker hitch and for long loads use 2 slings. The double wrap compresses the load on all 4 sides and provides far better load control.
What are slip hooks?
Slip hooks feature a wide throat that allows the chain or rope to flow freely through the hook. This allows the hook to be easily centered along a length of chain or to quickly remove slack when lashing or securing a load. Slip chain hooks are designed to receive a specific size of chain.
What is reduction factor in lifting?
Reduction Factor [RF] x the sling’s rated capacity for the type hitch that will be used = Sling’s Reduced Rating. * Measured from a common horizontal plane to the hoisting hook. What capacity sling do I need? 1. Determine the weight that the sling will be lifting [LW].