CSA Z62.3-11 pdf download – Chain saw kickback.
1 Scope 1.1 This Standard specifies kickback performance requirements for gasoline-powered chain saws, 80 cm 3 (4.88 in 3 ) engine displacement and smaller, Classes 1 A, 1 B, and 1 C, and electric chain saws, Classes 2A, 2B, and 2C, intended for forestry and other wood-cutting applications, as defined in CSA Z62.1 . 1.2 This Standard also specifies kickback performance requirements for replacement saw chains. 1.3 This Standard also specifies kickback marking requirements. 1.4 In 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. 1.5 The 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. 2 Reference publications This Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto. CSA (Canadian Standards Association) Z62.1 -1 1 Chain saws ANSI (American National Standards Institute) B1 75.1 -201 1 Safety Requirements for Gasoline Powered Chain Saws ISO (International Organization for Standardization) 6535:2008 Portable chain-saws — Chain brake performance
3 Definitions and abbreviations 3.1 Definitions The following definitions shall apply in this Standard: Bar nose radius — a continuous radius formed on the top portion of the bar from the centreline of the bar to an angle 35° above the centreline, as shown in Figure 1 . Chain brake — a device for stopping or locking the saw chain, activated manually or non-manually when kickback occurs. A manually activated chain brake is a chain brake operated by the hand of the operator. A non-manually activated chain brake is a chain brake actuated by kickback energy without manual activation. Clutch — a device for connecting and disconnecting a driven member to and from a rotating source of power. Computed kickback angle (CKA) — a computer-derived angle used as a measure of the reaction of a hand-held chain saw when subjected, under simulated conditions, to a rotational kickback impulse (see Figure 2). The angles calculated by the mathematical simulation of kickback are as follows: Computed kickback bar stopping angle with actuated chain brake (CKAwb) — a computer-derived value representative of the resultant CKA with chain brake engaged that describes the point when the angle to the bar tip has reached its peak. Computed kickback bar stopping angle without actuated chain brake (CKAwob) — a computer-derived value representative of the resultant CKA without chain brake engaged that describes the point when the angle to the bar tip has reached its peak. Computed kickback chain stopping angle (CKAcs) — a computer-derived value representative of the resultant CKA with chain brake engaged that describes the point when the motion of the saw chain has stopped. Drive sprocket — the chain drive wheel with teeth.
Kickback — the rapid upward motion of the guide bar that can occur when the saw chain, near the nose (tip) or the top area of the guide bar, contacts an object such as a log or branch (rotational kickback), or the backward motion that can occur when the wood closes in and pinches the saw chain in the cut (pinch kickback). Low-kickback saw chain — a saw chain that has been demonstrated to meet the requirements of Clause 4.1 .3. Powerhead — a chainsaw without the guide bar and chain. Rear handle — the support handle located on the housing or towards the rear of the powerhead housing and intended to be gripped by the right hand. Reduced-kickback guide bar — a guide bar with a maximum bar nose radius as described in Clause 4.2.5. Saw chain — a loop of chain for cutting wood, consisting of drive links, cutters, and side links, that is driven by the powerhead and supported by the guide bar.CSA Z62.3-11 pdf download.
