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',/3!29/&4%2-3
"OUNCING3KATING
4HE SIDEWARD MOTION OF THE GUIDE BAR THAT CAN OCCUR
INCREASINGTHERISKOFKICKBACK
3KATING
7HENTHECHAINSAWFAILSTODIGINDURINGACUTTHEGUIDE
BAR CAN BEGIN HOPPING OR DANGEROUSLY SKIDDING ALONG THE
SURFACEOFTHELOGORBRANCHPOSSIBLYRESULTINGINTHELOSSOF
CONTROLOFTHECHAINSAW4OPREVENTORREDUCESKATINGHOLD
THECHAINSAWWITHTWOHANDSANDMAKESURETHESAWCHAIN
ESTABLISHESAGROOVEFORCUTTING
"UCKING
4HEPROCESSOFCROSSCUTTINGAFELLEDTREEORLOGINTOLENGTHS
#HAIN"RAKE
!DEVICEUSEDTOSTOPTHESAWCHAIN
#HAINSAW0OWERHEAD
!CHAINSAWWITHOUTTHESAWCHAINANDGUIDEBAR
#LUTCH
! MECHANISM FOR CONNECTING AND DISCONNECTING A DRIVEN
MEMBERTOANDFROMAROTATINGSOURCEOF
POWER
$RIVE3PROCKETOR3PROCKET
4HETOOTHEDPARTTHATDRIVESTHESAWCHAIN
&ELLING
4HEPROCESSOFCUTTINGDOWNATREE
&ELLING"ACK#UT
4HEFINALCUTINATREEFELLINGOPERATIONMADEONTHEOPPOSITE
SIDEOFTHETREEFROMTHENOTCHING
UNDERCUT
&RONT(AND'UARD
!STRUCTURALBARRIERBETWEENTHEFRONTHANDLEOFACHAINSAW
AND THE GUIDE BAR TYPICALLY LOCATED CLOSE TO THE HAND
POSITION ON THE FRONT HANDLE AND SOMETIMES EMPLOYED AS
ANACTIVATINGLEVERFORACHAINBRAKE
&RONT(ANDLE
4HE SUPPORT HANDLE LOCATED AT OR TOWARD THE FRONT OF THE
CHAINSAW4HISHANDLEISFORTHELEFTHAND
'UIDE"AR
! SOLID RAILED STRUCTURE THAT SUPPORTS AND GUIDES THE SAW
CHAIN
+ICKBACK
4HEBACKWARDORUPWARDMOTIONORBOTHOFTHEGUIDEBAR
OCCURRING WHEN THE SAW CHAIN NEAR THE NOSE OF THE TOP
AREAOFTHEGUIDEBARCONTACTSANYOBJECTSUCHASALOGOR
BRANCH OR WHEN THE WOOD CLOSES IN AND PINCHES THE SAW
CHAININTHECUT
+ICKBACK0INCH
4HERAPIDPUSHBACKOFTHESAWWHICHCANOCCURWHENTHE
WOOD CLOSES IN AND PINCHES THE MOVING SAW CHAIN IN THE
CUTALONGTHETOPOFTHEGUIDEBAR
+ICKBACK2OTATIONAL
4HE RAPID UPWARD AND BACKWARD MOTION OF THE SAW WHICH
CAN OCCUR WHEN THE MOVING SAW CHAIN NEAR THE UPPER
PORTIONOFTHETIPOFTHEGUIDEBARCONTACTSANOBJECTSUCH
ASALOGORBRANCH
,OW+ICKBACK#HAIN
! CHAIN THAT COMPLIES WITH THE KICKBACK PERFORMANCE
REQUIREMENTSOF)3/WHENTESTEDONAREPRESENTATIVE
SAMPLEOFCHAINSAWS
.ORMAL#UTTING0OSITION
4HOSE POSITIONS ASSUMED IN PERFORMING THE BUCKING AND
FELLINGCUTS
.OTCHING5NDERCUT
!NOTCHCUTINATREETHATDIRECTSTHETREE´SFALL
2EAR(ANDLE
4HE SUPPORT HANDLE LOCATED AT OR TOWARD THE REAR OF THE
SAW)TNORMALLYCONTAINSTHETHROTTLE4HISHANDLEISFORTHE
RIGHTHAND
ICKBACK'UIDE"AR
! GUIDE BAR WHICH HAS BEEN DEMONSTRATED TO REDUCE
KICKBACKSIGNIFICANTLY
2EPLACEMENT3AW#HAIN
! CHAIN THAT COMPLIES WITH THE KICKBACK PERFORMANCE
REQUIREMENTS OF )3/ WHEN TESTED WITH SPECIFIC
CHAINSAWS )T MAY NOT MEET THE !.3) PERFORMANCE
REQUIREMENTSWHENUSEDWITHOTHERSAWS
3AW#HAIN
!LOOPOFCHAINHAVINGCUTTINGTEETHTHATCUTTHEWOODAND
THAT IS DRIVEN BY THE MOTOR AND IS SUPPORTED BY THE GUIDE
BAR
3PRINGPOLE
!SMALLTREESAPLING ORLIMBTHATISBENTORTRAPPEDUNDER
TENSION )T MAY ±SPRING BACK² RAPIDLY WHEN CUT CAUSING A
DANGEROUSSITUATION