What is ISO 21876 about?
ISO 21876 discusses machinery for forestry. ISO 21876 specifies a test method and corresponding performance requirements for saw chain shot protective windows on forestry machines equipped with a chain saw for cutting, harvesting or processing as defined in ISO 6814.
ISO 21876 also applies to machines that have been modified to perform cutting, harvesting or processing (such as excavator) with a chain saw cutting attachment.
Who is ISO 21876 for?
ISO 21876 on performance criteria for saw chain shot protective windows is applicable to:
- Manufacturers of forestry equipment
- Dealers and importers of forestry equipment
- Quality control personnel
- Safety inspection authorities
Why should you use ISO 21876?
Saw chain shot protective window provides protection against chainsaw breakage risks. Saw chain shots can be generated if the saw chain is broken on the upper or lower side of the guide bar as well as when broken at the nose sprocket. These breakages shoot out chain brackets at high speed and can be fatal if they hit the operator.
ISO 21876 provides you with a test method and performance criteria for windows intended to provide protection against saw chain shot which ensures the safety of the saw chain in case of mechanical failures.
ISO 21876 provides you test apparatus which simulates the situation in which the saw chain is broken. These situations include different saw chain speeds and combinations of distance to caw chain breakage, break force, guide bar geometry and saw chain preload that ensure a robust safety mechanism in case of chain breakage.
