Page 13 — English
Bucking
The process of cross cutting a felled tree or log into
lengths.
Chain Brake
A device used to stop the saw chain.
Chain Saw Powerhead
A chain saw without the saw chain and guide bar.
Clutch
A mechanism for connecting and disconnecting a
driven member to and from a rotating source of power.
Drive Sprocket or Sprocket
The toothed part that drives the saw chain.
Felling
The process of cutting down a tree.
Felling Back Cut
The final cut in a tree felling operation made on the
opposite side of the tree from the notching undercut.
Front Hand Guard
A structural barrier between the front handle of a chain
saw and the guide bar, typically located close to the hand
position on the front handle, and sometimes employed
as an activating lever for a chain brake.
Front Handle
The support handle located at or toward the front of
the chain saw. This handle is for the left hand.
Guide Bar
A solid railed structure that supports and guides the
saw chain.
Kickback
The backward or upward motion, or both, of the guide
bar occurring when the saw chain near the nose of the
top area of the guide bar contacts any object such as a
log or branch, or when the wood closes in and pinches
the saw chain in the cut.
Kickback (Pinch)
The rapid pushback of the saw which can occur when
the wood closes in and pinches the moving saw chain
in the cut along the top of the guide bar.
Kickback (Rotational)
The rapid upward and backward motion of the saw
which can occur when the moving saw chain near the
upper portion of the tip of the guide bar contacts an
object, such as a log or branch.
Low-Kickback Chain
A chain that complies with the kickback performance
requirements of ANSI B175.1 when tested on a repre-
sentative sample of chain saws.
Normal Cutting Position
Those positions assumed in performing the bucking
and felling cuts.
Notching Undercut
A notch cut in a tree that directs the tree’s fall.
Rear Handle
The support handle located at or toward the rear of the
saw. It normally contains the switch trigger. This handle
is for the right hand.
Reduced Kickback Guide Bar
A guide bar which has been demonstrated to reduce
kickback significantly.
Replacement Saw Chain
A chain that complies with the kickback performance
requirements of ANSI B175.1 when tested with specific
chain saws. It may not meet the ANSI performance
requirements when used with other saws.
SAFE-T-TIP Anti-Kickback Nose Guard
An attachment that is provided on the end of the guide
bar to prevent the chain at the end of the guide bar
from contacting the wood.
Saw Chain
A loop of chain having cutting teeth that cut the wood,
and that is driven by the motor and is supported by
the guide bar.
Spiked Bumper (Spike)
The pointed tooth or teeth for use when felling or buck-
ing to pivot the saw and maintain position while sawing.
Springpole
A small tree (sapling) or limb that is bent or trapped
under tension. It may “spring back” rapidly when cut,
causing a dangerous situation.
Switch Trigger
A device that when operated will complete or interrupt
an electrical power circuit to the motor of the chain saw.
Switch Linkage
The mechanism that transmits motion from a trigger
to the switch.
Switch Lock-out
A movable stop that prevents the unintentional opera-
tion of the switch until manually actuated.
GLOSSARY OF TERMS
