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Chain Saw Nomenclature
1 Tubular handle
2 Hand guard (release for chain brake)
3 Spike bar
4 Sprocket guard quick tightener
5 Sprocket guard, chain brake
6 Carbon brush cover
7 Back hand guard
8 Power cord with plug
9 Guide bar
10 Oil tank cap
11 Identication plate
Bucking: The process of cross cutting a felled tree or log
into lengths.
Chain Brake: A device used to stop the chain saw.
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 toothead part that drives
the saw chain.
Felling - The process of cutting down a tree.
Felling Back Cut : The nal cut in a tree felling operation
made on the opposite side of the tree from the notching
undercut.
Front Handle: The support handle located at or toward the
front of the chain saw.
Front Handle 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.
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 mo-
tion 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 representative 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.
Oiler Control: A system for oiling the guide bar and saw
chain.
Rear Handle: The support handle located at or toward
the rear of the saw.
Reduced Kickback Guide Bar: A guide bar which has
been demonstrated to reduce kickback signicantIy.
Replacement Saw Chain: A chain that complies with the
kickback performance requirements of ANSI B175.1 when
tested with specic chain saws. It may not meet the ANSI
performance requirements when used with other saws.
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.
Spike Bar (Spike): The pointed tooth or teeth for use
when felling or bucking to pivot the saw and maintain
position while sawing.
Switch: A device that when operated will complete or
interrupt an electrical power circuit to the motor of the
chain saw.
Lock-Off Button: A movable stop that prevents the unin-
tentional operation of the switch until manually actuated.
12 Locking button
13 Rear handle
14 Power switch
15 Sightglass for oil level
16 Saw chain
17 Cord grip for electric cord (pull relief)
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11 12 13
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