Draper CSP2625, Инструкция по эксплуатации, Страница: 22 / 36

9.6 KICKBACK (FIG.24)
Kickback – Definition:
– Rapid upward and/or backward motion of the
chain saw which can occur when the moving
saw chain near the tip of the guide bar
contacts an object such as a log or a branch.
Kickback is the most common hazard associated
with chain saws and can result in serious injuries,
and even fatalities.
– This chain saw features an inertia activated
chain brake and a manually triggered chain
brake. In the event of a particularly strong
kickback inertia generated releases the brake lever triggering the chain brake. If the
kickback is less the chain brake lever will activate on the operator‘s left hand (hence the
necessity to always operate the saw two handed). There are different types of kickback
and a couple of other associated risks.
– Because the saw chain is driven along the top of the guide bar away from the power
head, contact with the kickback zone can translate the chain movement in the opposing
direction on the guide bar. This is particularly the case if the chain becomes pinched or
snags in the kickback zone of the guide bar.
– Another kickback danger can result in the chain saw being forced horizontally back
towards the user. Kickback of this nature is the result of the chain along the top of the
guide bar being pinched, translating the force backwards through the guide bar.
– The opposite of kickback is having the chain saw pulled away. Pull-in can be a result of
the chain pinching along the bottom of the guide bar. As the chain along the bottom of
the guide bar is returning to the power head the translating force pulls the chain saw
from the operator‘s hands.
– In addition to kickback, risks such as skating and bouncing can lead to a loss of control of
the chain saw. If the chain fails to make an initial incision it can move sideways along the
timber `skating´ or `bouncing´. This sideways movement can result in off balancing,
overstretch, further loss of control or contact with the guide bar tip on another limb
causing a kickback.
– To avoid kickback occurring, do not use the tip of the guide bar. Take note of foreign
objects and other branches/limbs close to the area being cut.
Note: They may not be in your line of sight. Always make the initial cut on the tension
surface of the timber and use non metal spreading wedges to avoid the timber pinching
the chain. Always begin cutting at full speed and ensure the body of the saw, in particular
the spiked bumper, is against the timber.
– Cut only one piece of timber at any time and observe the timber while making the cut to
ensure the tension was assessed correctly. Hold the chain saw firmly as described.
Maintain a good firm stance and do not over reach. Do not cut above shoulder height.
The use of a low kick back saw chain is also advised. These are designed specifically to
help reduce the factors leading to kick back. Do not solely rely on the chain brake to stop
an accident occurring or chain saw ppe to avoid injury. They are a deterrent.
9 OPERATION & USE
22
FIG.24