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Arborist Hardware
Published at Oct 19, 2015

Carabiners, screw links, delta links, rigging rings, ladder snaps and clevises should always be examined closely to insure they are being loaded correctly, are strong enough for the application, and interact favorably with whatever other parts of the system they are attached to. They are perfectly acceptable in static rigging systems such as knotless rigging or balancing, but their use should be minimized as much as possible in dynamic rigging systems. 

 

Connecting links
Carabiners, screw links, delta links, rigging rings, ladder snaps and clevises should always be examined closely to insure they are being loaded correctly, are strong enough for the application, and interact favorably with whatever other parts of the system they are attached to. They are perfectly acceptable in static rigging systems such as knotless rigging or balancing, but their use should be minimized as much as possible in dynamic rigging systems.



Block and pulleys
The mechanics to multiply your manpower.



Arborist rigging blocks
These are designed to better resist damage from the loads and abuse of dynamic rigging situations. They have a bushing, for sling attachment, and a sheave, for less friction on the running rope. Rigging blocks also have thick extended cheek plates for strength and to protect the running ropes from inadvertent friction. These cheek plates are capable of being opened through various locking mechanisms to easily allow for the changing of slings or rigging lines. Examples are ISC Spring Lock Aluminum Blocks and CMI Stainless Steel Blocks.



Pulleys
These come in many configurations, including double sheave, Prusik minding, and fixed side plates. The primary difference between pulleys and blocks is that the pulley lacks a bushing for sling attachment, which also should restrict its use to static rigging systems. Use of a pulley in a dynamic rigging situation will lead to failure. Examples are most ropes course pulleys like the Petzl Traverse, ISC Fixe, CMI Steel Pulley, and Petzl Minder Pulley.



Lowering/lifting devices
Get a handle on friction for consistent safety and productivity.

Lowering devices allow for the management of friction in a consistent and controlled manner, increasing safety and productivity. The traditional method of taking wraps around the tree's trunk for lowering results in varying amounts of friction is based on trunk size and tree species. The use of lowering devices insures that the amount of friction will always be the same and is easily controlled and managed by the device operator. Examples are the Port-a-Wrap, GRCS, and Hobbs.

 
 

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