ISO 7915-2021 pdf free download
ISO 7915-2021-03 pdf free download.Forestry machinery一Portable chain- saws一Determination of handle strength.
This document specifies a test method and strength requirements for the handles of portable hand- held 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 forest ry — 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 .org/obp
— IEC Electropedia: available at http:J/www.e1ectropeiia.orgJ
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.. 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 fha is obtained, hold the load for a duration of (4 ± 1) s. The test shall be completed within I mm.
4.3 Load application
4.3.1 General
The chain-saw handles shall be subjected to static loads as specified in Tabic 1, separately applied at both handles grip, in each of the six directions illustrated in Figure 1 or Figure 2 and as described in 4I3.
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 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 load shall be applied to each handle over an area of (70 ± 5) mm in width. A means to apply the loads to the handles shall be designed in such a way as to maintain directional orientation to X1b Yp and Z through the handle midpoint.
4.3.3.2 Load application to the front handle
The load shall be centred on the normal handle grip area at (50 ± 5) mm to the left of X0 (see ISO 6533).
4.3.3.3 Load application to the rear handle
The load shall be centred on the grip area (25 ± 5) mm behind the point where the rear most end of the released throttle trigger enters the rear handle in the X direction, and centred on the handle profile in the Y and Z directions.
4.3.4 RelatIve load directions
The load shall be applied to each handle over an area of (70 ± 5) mm in width. A means to apply the loads to the handles shall be designed in such a way as to maintain directional orientation to X Y and Z, through the handle midpoint within ±50 relative to the guide bar mounting pad, while the load is applied. These directions shall be observed, irrespective of any deformation of the handles or the chain- saw body.
5 Test requirements
The chain-saw handles shall not break or crack when tested in accordance with Clause 4. After the test it shall be possible that the operator can hold the machine and stop the engine even In the case of full failure of the vibration isolation system. Before and after the test, the dimensional requirements of ISO 6533 and ISO 7914 shall be complied with.ISO 7915 pdf download.
