Explicação sobre rebote: Saiba como evitar o perigo

Visão geral

Rebote é o termo usado para descrever o repentino movimento para cima que as barras da motosserra fazem, sendo uma das causas mais comuns de acidentes com motosserra. Se as técnicas de corte apropriadas não forem seguidas, o rebote de uma motosserra pode ocorrer em velocidade relâmpago, com alto potencial de perigo e de graves ferimentos.

Tópicos

O que causa o rebote da motosserra?

Zona de perigo de rebote

Como reduzir o risco de rebote

Você não é um usuário experiente de motosserra? Use uma corrente de baixo rebote

O que causa o rebote da motosserra?

Duas circunstâncias podem causar rebote durante o uso de uma motosserra. A primeira ocorre quando a corrente em movimento na ponta da barra atinge um objeto. A segunda situação ocorre quando a madeira se aproxima e pinça a corrente da motosserra no meio do corte. Ambas as situações fazem com que a barra de motosserra projete (ou dê um “rebote”) para cima e para trás, o que pode fazer com que o usuário perca o controle da serra e resultar em ferimentos a ele ou a outras pessoas.

Os seguintes fatores (individualmente ou combinados) podem aumentar o risco de rebote da motosserra:

• Manutenção inadequada da serra
• Corrente em mau estado
• Corrente da motosserra com tensão frouxa
• Instalação incorreta de peças da corrente
• Rebites soltos
• Componentes da corrente da motosserra tortos, rachados ou quebrados
• Ângulos da corrente afiados incorretamente
• Ajustes excessivos do calibrador de profundidade da corrente
• Formatos incorretos do calibrador de profundidade da corrente

Além disso, quanto maior for o tamanho do sabre, maior será o risco de rebote.

The Kickback Danger Zone

The term “kickback danger zone” refers to the top of the tip of the chainsaw bar. This area has a high kickback risk. You should never saw using this part of the chain saw bar, since doing so will significantly increase the chances that you will experience kickback.

When this area of the bar touches an object like a branch or log, there is high likelihood that a sudden kickback reaction will occur. The larger the bar nose size, the higher the potential for chainsaw kickback.

How to Reduce the Risk of Kickback

Step 1: Before you use a new chainsaw, be sure to read through the operating instructions in their entirety.

Step 2: Stay alert at all times when using a chainsaw.

If you are tired, it’s not a good time to use a chainsaw.

Step 3: Be particularly cautious when removing tree branches.

Kickback can be caused during limbing if the nose of the bar strikes logs, stumps, hidden branches and the end of logs.

Step 4: When preparing a tree for felling, use the underside of the bar (aka pulling chain).

Never saw above shoulder height. Following these two practices will help reduce the risk of kickback while pruning trees and felling objects (bushes, small trees) blocking your way.

Step 5: If you are using your saw for felling or crosscutting, boring the chainsaw bar into the trunk may be the best way to cut.

The best way to avoid kickback, however, is to avoid putting the tip of the chain saw bar against the wood.

Step 6: Make sure the chain brake on your saw works prior to use.

Step 7: Pay attention to the nose of your chainsaw bar and how it is positioned.

Step 8: Choose low kickback chain saw chains.

When buying saw chain, choose the suitable for your needs which has the lowest kickback potential.

Step 9: Use narrow-nose bars, such as Oregon Double Guard bars, to ensure maximum kickback safety.

Step 10: Wear the right clothing and equipment to protect commonly injured areas:

• Chainsaw chaps
• Gloves
• Protective eyewear (either safety goggles or a face shield)
• A hard hat
• Hearing protection (either ear muffs or ear plugs)
• Heavy boots such as logging boots

Step 11: Avoid clothing that is too tight or too loose.

Step 12: When cutting, make sure your thumbs and fingers are completely wrapped around your chain saw handles.

Step 13: When performing maintenance, follow all of the instructions that came with your chain saw chain.

This helps minimize the risk of injury.

Not an Experienced Chain Saw User? Use Low Kickback Chain

Most of today’s chain saws incorporate features which reduce kickback and other sources of chainsaw-related injury. These built-in features include chain brakes, the front (left) hand guard, the bar tip guard and low or reduced kickback chain and guide bars. In order to guarantee the effectiveness of these safety features, you need to make sure that your chainsaw is properly assembled and that all the components are securely attached and functional.

Unless you have experience or training for responding to chainsaw kickback, you should use low kickback chain. In North America, low kickback chain is packaged with a green label from the American National Standards Institute (ANSI).

Note: Some older Oregon product packaging may use a blue label to identify low kickback chain.

Professional saw chain has a yellow label with a warning on it. This type of saw chain is not low kickback and is only intended for use by professional chain saw operators.