.
...
..-
~
.
Many
factors influence the occurence
and
force of the
!kickback
reaction.
The
~
of
bar
and
saw chain you
~
~
is a factor in the force of
ttie-klCkback
reaction.
;
The
speed
of
~
~wh"
the
cutter
contacts
the
object.
.,'
_
~"
<.~,
),' -
'_'.
".
-
,Kickoaclfforces'Inereuewlth
the
raleOf
Impact·
il
>
\::..:
_"M~:
','
,'i-
~
''''-''f
~_ct~~
u.;
~ose
of
the
b,ar
and
the
~fo.~·{see-IIt-11).'.-
':
,.:
'
".'
KickbaCltVmosfproriOunc:ed
'"1M
upper
quadrant of the
~bar
ROSa,
,,'.'
SOme
STlHL
chain types are designed to reduce kickback
forces.
The.cJeptb.aauges:'
Improper
lowering
of
the
depth gauges also
Incre~
the
chanceofa~
:1
The
sharpening
condition:
warning!
Adun
orimproperty sharpen.ed
~
may Increase the
risk
of
kickback.
Always cut
with
a property sharpened chain .
",
Devices
for
reducing
the
risk
of
Idckback
Injury
STlHL
has
developed a chain stopping system to reduce
the
risk
of injury
In
certain kickback sItuations.Jt ~ called a
Quickstop.
""
.,
The,
,Quickstopis,
av-.i~
as
an
optiQn on most STIHL
chain.saws.
' .
Wti.
a~
oc:curs
the
guide.bar
may
iotate
around
the
front
handle. H
the
cutting position
Is
such that
the
operatOr's
left
hand
is
gripping
the
froI1t
hBrldle
behind
the
hand
guard,
and
if the left hand rotates around the front
handle and contacts the front:
hanef
guard, which is the
,Quickstop activating
lever,.
this contact
will
activate the
. Quickslop
and,~
the;chaln'(~
ill 13). '
\
The
~.brake
of
some
STlHL
chain
saws
is additional
.
self-activated
by
fnertia.·
see
appropriate.
ct1apler
"ChaIn
Brake"dt
yo~r
<?wner's
ManuaL
' , ,
,
Kickback
tendency increases as
the
radius or size
of
the
guide
bar,
noseAncreaseLSTIHL has
developed
guide
bars
with
small
nose
radius.
These
bars. are designed to
reduce
the
kfckback
tendency
and
are available, as
an
option.
STlHL
taas~
d~~
chains
whoseconftgu,r~
are
~ned.to
reduce.~
forces. These.
chains
are
available
as
an
option.
.
Warning!
Chain
saw
kickback
may cause serious or fatal
'injury.
To
reduce the
risk
of
kickback
injuries snHL'recommends
that
you
equip
your
saw·With
a narrow),ose
bal,
lOW
profile
chain
or
oth8r
chatn
deSIgned
to
reduce
'kickback
forces,
..
~aS11HL~.
Warning I
~o
Qulcksk;Jp
or
ch~
~
de~
.prev&n!SkIckback.
These
devices
are
designed only to stop the chain.
if
acti-
vated,
in.
certain kickback
situations.
In
~r
for the
Quickstep
to
reduce
the
riSk
of
'kiCkback
inj~,
it
mUst
be
P"'~
mai~
anei'ln
gOod
working
order.
In
addition,
there
must be
enough
distance between
the
bar
and
the operator to ensure that
the
Quickstop has
sufficient time to activate
and
stop the chain before poten-
tial contact
with
the
operator. '
11
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