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Safety and Health Topics > Multimedia > Logging Slide Presentation > Slide 80

Logging Slide Presentation   80 of 82  Back    Next    Index    Top Lock: Twisting of trees and butts off the ground create pressure on the stem that can be handled with a top lock. If the stem of the tree is under stress, a top lock can be used to prevent the top from kicking up and striking the logger. The first cut of a top lock is made on the side of the tree that is under compression, in the top or bottom of the stem. The second cut is made on the side of the tree which is under tension. This prevents pinching the saw. The top cut is always made closer to the top of the tree and the bottom cut is made closer to the bottom of the tree (the reverse order of the limb lock). Both cuts must by-pass so that all fiber is severed.

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