Bedienungsanleitung Stihl MS 461 R (Seite 16 von 140) (Englisch, Spanisch)

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MS 461 R

English

principles for handheld power

equipment, primarily due to insecure

footing.

WARNING

STIHL does not generally recommend

this practice due to the many variables

the fire / rescue service may encounter

in the field, e.g. steeply sloped roofs,

low-grip conditions such as ice / snow,

the close proximity of bystanders

(including other fire fighters), weakened

structural integrity, etc.

WARNING

Roof venting is extremely dangerous

and should be conducted only

byspecially trained personnel in

accordance with all local, state and

federal rules and regulations. In

addition, in order to reduce the risk of

serious or fatal injury, always observe

the following precautions. Never attempt

to operate any Rescue Saw when you

are not in a secure position, allowing you

to safely hold the saw with both hands.

Never use a Rescue Saw while standing

on an insecure and / or unstable ladder.

Such ladders may fall, slide or collapse.

Never use a Rewscue Saw on a roof

unless you are certain that it is (still)

structurally sound and secure footing is

provided. Avoid cutting through rafters

that will weaken the roof support and

standing on surfaces that will be

weakened by the cut. The frequently

used pre-fab roof trusses held together

by nail-plates are particularly subject to

rapid weakening when exposed to the

heat of a fire. Sometimes, a moveable

platform unattached to the structure,

such as the basket of an aerial truck,

may be the only means to provide the

necessary adequate footing and the

freedom to use both hands to operate

the saw.

Reactive Forces Including Kickback

WARNING

Reactive forces may occur any time the

chain is rotating. Reactive forces can

cause serious personal injury.

The powerful force used to cut wood can

be reversed and work against the

operator. If the rotating chain is suddenly

stopped by contact with any solid object

such as a log or branch or is pinched, the

reactive forces may occur instantly.

These reactive forces may result in loss

of control, which, in turn, may cause

serious or fatal injury. An understanding

of the causes of these reactive forces

may help you avoid the element of

surprise and loss of control. Sudden

surprise contributes to accidents.

The most common reactive forces are:

– kickback,

– pushback,

– pull-in.

Kickback:

The reaction of the cutting force of the

chain causes a rotational force on the

chain saw in the direction opposite to the

chain movement. This may fling the bar

up and back in a lightning fast reaction in

an uncontrolled arc mainly in the plane

of the bar. Under some cutting

circumstances the bar moves towards

the operator, who may suffer severe or

fatal injury.

Kickback may occur, for example, when

the chain near the upper quadrant of the

bar nose contacts the wood or is

pinched during limbing or when it is

incorrectly used to begin a plunge or

boring cut.

001BA093 LÄ

Kickback may occur

when the moving saw

chain near the upper

quadrant of the bar nose

contacts a solid object or

is pinched.

001BA035 KN

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Stihl MS 461 R Seite 16

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