ISO 21876:2020

Name: ISO 21876:2020 — Machinery for forestry — Saw chain shot protective windows — Test method and performance criteria
SKU: ISO 21876:2020
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Machinery for forestry — Saw chain shot protective windows — Test method and performance criteria

Название (английский):

ISO 21876:2020

Machinery for forestry — Saw chain shot protective windows — Test method and performance criteria

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 12
Дата публикации:: 25 сентября 2020 г.
Издание:: ISO IS 21876 edition 1 version 1
ICS:: 65.060.80

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Описание (английский):

This document 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. It also applies to machines that have been modified to perform cutting, harvesting or processing (such as excavator) with a chain saw cutting attachment.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21876:2020 - Machinery for forestry: Saw chain shot protective windows - specifies a test method and performance criteria for protective windows fitted to forestry machines that use a chain saw (including modified machines with chain saw attachments). The standard defines how to simulate a saw chain break and measure whether a protective window prevents high‑speed saw chain shots from passing through to protect operators and bystanders.

Key topics and requirements

Test apparatus and setup: Uses a rig (per ISO 11837 or equivalent) to generate saw chain shots with the saw casing removed; includes a drive unit capable of maintaining saw chain speed and a protective enclosure for safety.

Cutting attachment parameters: Defines guide bar selection (longest recommended bar), saw chain pitch, number of drive links and a test saw chain speed equal to 1.2× the maximum no‑load speed recommended by the cutting attachment manufacturer.

Measurement and instrumentation:

Two shot measurement panels (200 mm ± 2 mm apart) to calculate shot speed and vector.
Shot indication panel positioned 75 mm ± 2 mm behind the window sample.
Angle and speed measurement tolerances (shot angle measured to ±1°, speed control ±2 m/s, drive shaft speed uncertainty ±1%).

Test samples and conditioning:

Window test sample dimensions: 360 mm ± 20 mm by 1 000 mm ± 20 mm, flat and mounted to limit deflection.
Test temperature: 20 °C ± 2 °C measured at mid‑thickness; samples preconditioned to homogenous temperature.

Procedure controls: Pre‑calibration (10 runs without sample), saw chain stopping device positioning, repeatability criteria (shot occurrence and angle consistency) and a specified number of test runs.

Ancillary requirements: Labelling, test reporting and use of a saw chain stopping device (Annex A). Protective enclosure and safety warnings are mandated.

Applications and practical value

ISO 21876:2020 is used to:

Validate and certify protective windows for harvester heads, grip saws, carriers and retrofitted machines (e.g., excavators with chain saw attachments).

Support product development and design verification for manufacturers of forestry machinery glass, polymer windows and guarding systems.

Provide testing protocols for independent laboratories and compliance bodies to assess operator safety against saw chain shots.

Inform risk assessments and procurement specifications for forestry operators, fleet managers and safety engineers.

Related standards

ISO 11837 - Saw chain shot guarding systems (test method)

ISO 6814 - Definitions for chain saw‑equipped forestry machines

ISO 536 - Paper grammage (referenced for indication panels)

EN 13984 - Plastic/rubber vapour control layers (materials reference)

Keywords: ISO 21876:2020, saw chain shot protective windows, forestry machinery safety, test method, performance criteria, saw chain shot, guide bar, cutting attachment, protective window testing.

ISO 21876:2020

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and practical value

Who should use this standard

Related standards

Технические детали

ISO 11837:2011

Machinery for forestry — Saw chain shot guarding systems — Test method and performance criteria

ISO 6814:2009

Machinery for forestry — Mobile and self-propelled machinery — Terms, definitions and classification

ISO 5365:2024

Dentistry — Designation system for tooth developmental stages