前言:这是CSA Z62的第四版。3、链锯回扣。它取代了2004年、1996年和1990年出版的之前版本。本标准源于减少链锯回扣事件导致的加拿大林业伤亡的需要。锯链的设计进行了修改，以生产能够降低反冲程度的链条。因此，评估这些链条的反冲性能并确定其有效程度变得非常重要。最初的目的是制定一个标准，只评估所谓的低反冲链条的性能，而不受安全特性（如链式制动器）的影响。然而，链锯通常作为成套设备出售，因此有必要开发一种双重方法。 因此，本标准规定了链作为完整链锯装置的一部分的性能，以及作为替换链单独购买的链的性能。本版本的主要修订包括以下内容:（a）增加了带制动器的计算反冲角、不带制动器的计算反冲角和链条停止角的定义。在本标准中，这些术语用于帮助理解各条款上下文中计算的反冲角。（b） 增加了减少反冲导杆的定义和要求；（c） 降低了A类和B类链锯回扣的验收限值；（d） 引入通用反冲装置（GKU）以鉴定低反冲更换链。链锯技术委员会的目的是让GKU取代表1中的链锯清单，尽管本版保留了表1，以便实验室有时间过渡到使用GKU。 GKU的设计旨在密切模拟表1中所列链锯在各个链系中的反冲性能，1/4链距（贸易尺寸）除外。实现这一目标需要四次设计迭代和五年多的开发。通过与北美几家经验丰富的实验室进行Rond robins验证，GKU已经证明，与制造商对3/8 mini、3/8 standard和0.325链系列的原始评估值相比，它能够再现等效的计算反冲角。新的第6条规定了更换锯链的试验方法，新的附录F提供了GKU的设置和操作说明；（e）为了进一步减少反冲试验中的可变性来源，针对介质硬度制定了新的试验程序和验收限值- 密度纤维板。附录E中规定了新的试验程序。预计新产品在发布后一年内（对于发布时存在的产品，两年内）符合本标准的要求。范围:1.1本标准规定了用于林业和其他木材切割应用的80 cm3（4.88 in3）发动机排量及以下1A、1B和1C级汽油动力链锯和2A、2B和2C级电动链锯的反冲性能要求，定义见CSA Z62。1.1.2本标准还规定了更换锯链的反冲性能要求。1.3本标准还规定了反冲标记要求。1.4在CSA标准中，“应”用于表示要求，即用户有义务满足的条款，以符合标准； “应该”用于表示建议或建议但不需要的建议；“可”用于表示一个选项或在标准范围内允许的选项。注释随附条款不包括要求或替代要求；随附条款的注释的目的是将解释性或信息性材料与文本分开。表和图的注释被视为表或图的一部分，可以作为要求编写。附件被指定为规范性（强制性）或信息性（非强制性）来定义其应用。1.5国际单位制给出的数值为本标准中的记录单位。括号中给出的值仅供参考和比较。

Preface:This is the fourth edition of CSA Z62.3,Chain saw kickback. It supersedes the previous editions, published in 2004, 1996, and 1990.This Standard arose from a need to reduce injuries and fatalities in the Canadian forest industry caused by incidents from chain saw kickback. Saw chain designs were modified to produce chains that would reduce the degree of kickback. It therefore became important to evaluate the kickback performance of these chains and to determine the extent of their effectiveness.The original intent was to prepare a Standard that would evaluate only the performance of so-called low-kickback chain without the influence of safety features such as chain brakes. Chain saws, however, are normally sold as complete units, so it became necessary to develop a dual approach. This Standard therefore addresses the performance of chain as part of a complete chain saw unit, as well as chain purchased separately as replacement chain.Major revisions to this edition include the following:(a) addition of definitions for computed kickback angle with brake, computed kickback angle without brake, and chain stopping angle. These terms are now used throughout this Standard to aid in the understanding of computed kickback angle within the context of each clause.(b) addition of a definition and requirements for a reduced-kickback guide bar;(c) lowered acceptance limits for kickback on Class A and B chain saws;(d) introduction of the generic kickback unit (GKU) to qualify low-kickback replacement chain. The intent of the Technical Committee on Chain Saws is for the GKU to replace the list of chain saws in Table 1, although Table 1 has been retained in this edition to allow laboratories time to transition to use of the GKU.The design of the GKU is intended to closely emulate the kickback performance of the chain saws listed in Table 1 for each respective chain family, except 1/4 chain pitch (trade size). Achieving this objective required four design iterations and over five years of development. Verified by conducting round robins with several experienced laboratories in North America, the GKU has shown itself to be capable of reproducing equivalent computed kickback angles compared to the manufacturer's original evaluated values for the 3/8 mini, 3/8 standard, and 0.325 chain families.New Clause 6 specifies the test methods for replacement saw chain and new Annex F provides set-up and operating instructions for the GKU; and(e) to further reduce sources of variability in kickback testing, a new test procedure and acceptance limits have been created for the hardness of medium-density fibreboard. The new test procedure is specified in Annex E.Compliance of new products with the requirements of this Standard is expected within one year after publication (two years for products existing at the time of publication).Scope:1.1This Standard specifies kickback performance requirements for gasoline-powered chain saws, 80 cm3(4.88 in3) engine displacement and smaller, Classes 1A, 1B, and 1C, and electric chain saws, Classes 2A, 2B, and 2C, intended for forestry and other wood-cutting applications, as defined in CSA Z62.1.1.2This Standard also specifies kickback performance requirements for replacement saw chains.1.3This Standard also specifies kickback marking requirements.1.4In CSA standards, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and "may" is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.1.5The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.