Assessments - 3, GPA: 3
(
)
)
|
Facilidade de uso
To reduce risk of burns do not touch the muffler and other parts while they are hot. !Warning! Do not cut any material other than wood or wooden objects. Use your chainsaw for cutting only. It is not designed for prying or shoveling away limbs, roots or other objects. When sawing, make sure that the saw chain does not touch any foreign materials such as rocks, fences, nails and the like. Such objects may be flung off, damage the saw chain or cause the saw to kickback. Do not underbuck freely hanging limbs because the chain may get pinched and cause kickback and loss of control. Take special care when cutting shattered wood because of the risk of injury from slivers being caught and thrown in your direction. Don't put pressure on the saw when reaching the end of a cut. The pressure may cause the bar and rotating chain to pop out of the cut or kerf, go out of control and strike the operator or some other object. If the rotating chain strikes some other object, a reactive force may cause the moving chain to strike the operator. 12 MS 200 T 001BA034 KN001BA034 KN To reduce risk of falls, keep rotating saw chain well clear of harness and lifelines to avoid them being severed. It is essential to use a double lifeline. Check condition of harness, belts and ropes at regular frequent intervals. Always pull the saw out of the cut with the chain running. After finishing a cut, activate the chain brake to lock the chain or shut down the engine before moving the saw to another position in the tree. 001BA035 KN Reactive forces including kickback !Warning! Reactive forces may occur any time the chain is rotating. Reactive forces can be dangerous! In any chainsaw, 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 like a log or branch or is pinched, the reactive forces may occur instantly. These reactive forces may result in loss of control which may, in turn, cause serious or fatal injury. An understanding of the causes of these reactive forces may help you avoid loss of control. English / USA The most common reactive forces are – kickback, – pushback, – pull-in. Kickback .Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched. The reaction of the cutting force of the chain causes a rotational force on the chainsaw in the direction opposite to the chain movement. This may fling the bar up and back 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. MS 200 T 13 English / USA The greater the force of the kickback reaction, the more difficult it becomes for the operator to control the saw. Many factors influence the occurrence and force of the kickback reaction. These include chain speed, the speed at which the bar and chain contact the object, the angle of contact, the condition of the chain and other factors. The type of bar and saw chain you use is an important factor in the occurrence and force of the kickback reaction. Some STIHL bar and chain types are designed to reduce kickback forces. STIHL recommends the use of reduced kickback bars and low kickback chains. ANSI B 175.1-2000 chainsaw kickback standard Section 5.11 of ANSI standard B 175.1-2000 sets certain performance and design criteria related to chainsaw kickback. To comply with section 5.11 of ANSI B 175.1-2000: a) saws with a displacement of less than 3.8 cubic inches – must, in their original condition, meet a 45° computer derived kickback angle when equipped with certain cutting attachments. – and must be equipped with at least two devices to reduce the risk of kickback injury, such as a chainbrake, low kickback chain, reduced kickback bar, etc. b) saws with a displacement of 3.8 cubic inches and above – must be equipped with at least one device designed to reduce the risk of kickback injury such as a chain brake, low kickback chain, reduced kickback bar, etc. The computer derived angles for saws below 3.8 cubic inch displacement are measured by applying a computer program to test results from a kickback test machine. !Warning! The computer derived angles of § 5.11 of ANSI B 175.1-2000 may bear no relationship to actual kickback bar rotation angles that may occur in real life cutting situations. In addition, features designed to reduce kickback injuries may lose some of their effectiveness when they are no longer in their original condition, especially if they have been improperly maintained. Compliance with § 5.11 of ANSI B 175.12000 does not automatically mean that in a real life kickback the bar and chain will rotate at most 45°. !Warning! In order for powerheads below 3.8 cubi...