BS ISO 7915:2021 pdf download – Forestry machinery — Portable chain-saws — Determination of handle strength This document specifies a test method and strength requirements for the handles of portable handheld chain-saws for use primarily in forestry and tree-service. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6531, Machinery for forestry — Portable chain-saws — Vocabulary ISO 6533, Forestry machinery — Portable chain-saw front hand-guard — Dimensions and clearances ISO 7914, Forestry machinery — Portable chain-saws — Minimum handle clearance and sizes 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 6531 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https:// www .iso .org/ obp — IEC Electropedia: available at http:// www .electropedia .org/ 4 Test procedure 4.1 Test temperature The test temperature shall be (20 ± 5) °C. 4.2 Test performance The test shall be performed with the test loads specified in 4.3. The load shall be gradually applied until the test load is achieved in such a manner that there is no impact damage. When the load specified in 4.3 is obtained, hold the load for a duration of (4 ± 1) s. The test shall be completed within 1 min. 4.3 Load application 4.3.1 General The chain-saw handles shall be subjected to static loads as specified in Table 1, separately applied at both handles grip, in each of the six directions illustrated in Figure 1 or Figure 2 and as described in 4.3.3. 4.3.2 Fixation In each case, the chain-saw shall be fixed rigidly by the guide bar mounting pad and securely clamped to prevent flexing of the fixture greater than 2° when load is applied. The sprocket cover may be installed if needed. Direction X P shall be aligned parallel to the theoretical centreline of the guide bar. A minimum clearance shall be maintained to prevent contact between the fixture and any part of the body of the chain-saw, excluding the bar mounting pad, so that they do not touch each other during the test. 4.3.3 Load application 4.3.3.1 General The...

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