ISO 6533:2020 pdf download

ISO 6533:2020 pdf download.Forestry machinery — Portable chain-saw front hand- guard — Dimensions and clearances
1 Scope
This document specifies the dimensions and clearances for front hand-guards and their openings on portable hand-held chain-saws. These dimensions and clearances ensure the necessary safety provided by the hand-guard, which serves as both a shield between the operator’s hand and the saw-chain and as an actuator for manually operated chain brakes. For chain-saws with wrap around handles (see Figure 1), this document is not applicable to the portion of the front handle to the right (when viewed from the rear) of the top brace.
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
IEC 61032, Protection of persons and equipment by enclosures — Probes for verification
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 General
The dimensions of the front hand-guard and the clearances shall be in relation to the intended position of the left hand on the front handle during vertical cutting (bucking), determined using defined gauges (see Clause 5).
Unless otherwise specified, the following is applicable when determining the dimensions and clearances.
a) The chain-saw shall be kept in the upright position with guide bar centreline horizontal; and the total forces when applying the gauges (force on gauge plus gauge gravity force in probing direction) shall be 10 N −1 0 N.
b) If the front hand-guard also activates the chain brake, the measurements shall be made
1) with the front hand-guard in the position for non-activated chain brake, and
2) with a force of 10 N 0 N applied at the top edge of the guard, at 45° in a forward and downward direction relative to the guide bar centreline and 50 mm to the left of the reference point X 0 (see Clause 6 and Figure 5), when viewed from the rear (to eliminate any free play in the hand-guard mounting).
5 Gauge dimensions
Rigid gauges of the types and sizes specified in Table 1 shall be used to determine the dimensions and clearances.