Machinery for forestry - Portable brush-cutters and grass-trimmers - Vocabulary
1Key Takeaways
This document defines terms relating to portable hand-held brush-cutters and grass-trimmers, their cutting attachments and power sources. The brush-cutter position is shown in Annex A.
2Expert Interpretation
This article provides an in-depth interpretation of the ISO 7112:2018 international standard's terminology for portable brush cutters and lawn mowers, covering eight technical modules including working functions, machine types, cutting devices, and safety equipment. It also provides a comparison of professional terminology definitions and guidance on equipment selection.
Analysis of the core content of the standard
| Technical module | Number of key terms | Safety-related clauses | Changes in the 2017 version |
|---|---|---|---|
| Working function | 4 | Definition of cutting kickback | No change |
| Machine type | 5 | Energy limit of lawn mower | New lawn edge trimmer |
| Safety device | 9 | Quick Release Mechanism | Handle Reference Modification |
Detailed Explanation of Key Technical Terms
3.3.1 Cutting Attachments
The standard clearly defines three types of cutting devices: metal/plastic rotating blades (3.3.1.1), saw blades (3.3.1.2), and flexible cutting devices (3.3.1.3). Flexible cutting devices use nylon wire or oscillating blades and are suitable for lawn mowing. Their kinetic energy must be controlled within 10 joules (3.2.4).
Safety Design Evolution
The 2018 version strengthens the definition system of safety devices:
1. Cutting guard (3.4.2) must protect the operator from both contact and splashing
2. A new Throttle lock device (3.4.9) is added to prevent accidental triggering
3. Suspension point (3.4.8) design specifications are shown in the figure in Appendix A
Implementation Recommendations
- When selecting equipment, refer to Section 3.2 to determine the machine type (brush saw/lawn trimmer)
- Safety training should focus on 3.1.4 Cutting kickback phenomenon and protective measures
- For maintenance, refer to 3.6 Carburetor adjustment parameters (idle/high speed mixture ratio)