ISO/DIS 7112

ISO/TC 23/SC 17

Secretariat: SIS

Date: 2025-12-19

Machinery for forestry — Portable brush-cutters and grass-trimmers — Vocabulary

Matériel forestier — Débroussailleuses et coupe-herbe portatifs — Vocabulaire

DIS stage

© ISO 2025

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Contents

Foreword iv

1 Scope 1

2 Normative references 1

3 Terms and definitions 1

3.1 Work functions 1

3.2 Machine types 1

3.3 Cutting equipment 2

3.4 Safety devices 2

3.5 Control system 3

3.6 Carburettor setting 4

3.7 Handles 4

3.8 Exhaust system 4

3.9 Miscellaneous 4

Bibliography 6

Index 7

Foreword

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This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually portable (hand-held) powered lawn and garden equipment and forest machinery.

This sixth edition cancels and replaces the fifth edition (ISO 7112:2018), which has been technically revised. The changes compared to the previous edition are as follows:

• The scope has been modified, and the Annex A has been deleted.
• The term “cutting means thrust ” (former 3.1.4) has been changed to “blade thrust” (3.9.1), with its definition revised; subsequent entries have been renumbered accordingly.
• The term “brush-cutter”, “brush saw”, “grass-trimmer” and “lawn edge-trimmer” (3.2.1~3.2.4, respectively ) have been revised.
• The term "clearing saw" (3.2.2) has been added.
• The term “lawn-trimme"(former 3.2.4) has been removed and subsequent entries have been renumbered accordingly.
• The term “cutting means”, “saw blade” and “flexible cutting means”(3.3.1.1~3.3.1.3, respectively) have been revised.
• The term “quick-release mechanism” and “handgrip”(3.4.4 and 3.7.2, respectively) have been modified for better understanding.
• The term “dry mass/weight” (3.9.12) has been revised.
• Editorial corrections.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Machinery for forestry — Portable brush-cutters and grass-trimmers — Vocabulary

This document defines terms relating to portable hand-held brush-cutters and grass-trimmers, their cutting attachments and power sources.

There are no normative references in this document.

For the purposes of this document, the following terms and definitions 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 https://www.electropedia.org/

felling

separation of a standing tree from its root system

shredding

reduction of bushes, small trees and other growing organic materials to smaller pieces

trimming

cutting of weeds, grass and other similar soft vegetation

brush-cutter

unit using a rotating cutting means (3.3.1.1), intended to cut weeds, scrub, brush-wood, and similar vegetation

brush saw

clearing saw

unit using a rotating saw blade (3.3.1.2), intended to cut small trees and saplings

grass-trimmer

unit using a rotating flexible cutting means (3.3.1.3), intended to cut weeds, grass or similar soft vegetation

lawn edge-trimmer

powered grass-trimming machine where the cutting attachment (3.3.1) operates in a plane approximately perpendicular to the ground, intended to cut weeds, grass or similar soft vegetation

cutting attachment

cutting device such as a cutting means, saw blade or a flexible cutting means

cutting means

device made of metal or plastics with cutting edges, designed to cut weeds, brush, scrub and similar vegetation

saw blade

circular metal blade with peripheral cutting teeth, designed to cut wood, such as small trees and saplings, by continuously removing material

flexible cutting means

non-metallic device using flexible line(s), string(s) or similar non-rigid cutting elements, such as pivoting cutters, designed to cut weeds, grass or similar soft vegetation

cutting means retainer

saw blade retainer

retainer

mechanism which holds the cutting means (3.3.1.1) or saw blade (3.3.1.2) to the driving member

cutting attachment guard

device intended to protect the operator from unintentional contact with the cutting attachment (3.3.1) and from thrown objects

cutting means cover

transport cover

manually removable device covering the cutting edges of the cutting means (3.3.1.1) or saw blade (3.3.1.2) during transportation or storage

quick-release mechanism

device enabled by the operator to free themself quickly from the unit in case of emergency

barrier

device attached to the unit, designed to maintain a minimum distance between the operator and the cutting attachment (3.3.1) when the unit is being operated

harness

adjustable equipment by which the unit is suspended from the operator

hip pad

flexible material attached to the unit or the harness (3.4.6), to cushion the operator from impact from the unit and to reduce the transmission of vibrations

suspension point

part of the machine to which the harness (3.4.6) can be attached

throttle trigger lockout

device that prevents operation of the throttle trigger (3.5.6) without intentional manual intervention

choke

device for enriching the fuel/air mixture in the carburettor to aid starting

stop switch

device which initiates the stopping of the power source

starter

device that rotates the engine crank shaft for starting

recoil starter

device for starting the engine by pulling a rewind rope which automatically rewinds when released

electric starter

device that rotates the engine crank shaft using external power, such as battery or mains, for starting

primer

device for supplying fuel to the pump of the carburettor to aid starting

throttle control latch

device to temporarily set the throttle in a partially open position to aid in starting

throttle trigger

device, usually a lever, activated by the operator's hand or finger, for controlling the engine speed and/or power

throttle linkage

device that transmits motion from the throttle trigger (3.5.6) to the throttle

decompression valve

device for lowering the compression in the cylinder to aid starting

idle-speed adjuster

T

device, normally a screw, acting on the throttle, for adjusting the idling speed (3.9.9)

low-speed mixture adjuster

L

device, normally a screw, for adjusting the fuel delivery at idling/low speed

high-speed mixture adjuster

H

device, normally a screw, for adjusting the fuel delivery at full throttle

handle

support device fitted to the unit to enable the operator to hold and manoeuvre the unit

handgrip

surface or structure specifically designed for the operator's hand to grasp the backpack power unit (3.9.3) for handling and transport

exhaust system

part(s) used to contain and direct gas from the cylinder exhaust port to the atmosphere, including all directly attached shields for hot surface contact prevention

muffler

silencer

device for reducing engine exhaust noise and directing the exhaust gases

spark arrester

device through which the exhaust gases pass, intended to stop smouldering/burning particles

blade thrust

sudden sideways, forward or backward motion of the machine, which may occur when the rotating cutting means (3.3.1.1) or saw blade (3.3.1.2) comes in contact with a solid object

angle transmission

device for transmitting the power from the power transmission shaft (3.9.5) to the cutting attachment (3.3.1)

backpack power unit

power source which is designed to be carried on the operator's back by means of a supporting device

clutch

device for connecting and disconnecting a driven member to and from a rotating source of power

power transmission shaft

shaft inside the shaft tube (3.9.7) for transmitting power from the engine to the angle transmission (3.9.2) or cutting attachment (3.3.1)

output shaft

shaft to which the cutting attachment (3.3.1) is connected

shaft tube

part of the machine that provides a casing for the power transmission shaft (3.9.5)

governor

device that limits the maximum engine speed

idling speed

engine speed at which the cutting attachment (3.3.1) does not move

Note 1 to entry: A range of idling speeds is normally identified by the machine manufacturer and stated in the instruction handbook.

maximum power speed

full-load speed

engine speed at which maximum corrected brake power is obtained

Note 1 to entry: The maximum power speed is obtained in accordance with ISO 20599.

racing speed

maximum engine speed achieved at full open throttle or the engine speed at 133 % of the maximum power speed (3.9.10), whichever is less

dry mass/weight

total unit mass/weight with empty fuel/oil tank(s) and without cutting attachment (3.3.1), cutting attachment guard (3.4.2) and harness (3.4.6)

Bibliography

[1] ISO 20599, Manually portable (hand-held) powered lawn and garden equipment and forest machinery — Engine performance and fuel consumption

Index

A

angle transmission 3.9.2

B

backpack power unit 3.9.3

barrier 3.4.5

blade thrust 3.9.1

brush saw 3.2.2

brush-cutter 3.2.1

C

choke 3.5.1

clearing saw 3.2.2

clutch 3.9.4

cutting attachment 3.3.1

cutting attachment guard 3.4.2

cutting means 3.3.1.1

cutting means cover 3.4.3

cutting means retainer 3.4.1

D

decompression valve 3.5.8

dry mass/weight 3.9.12

E

electric starter 3.5.3.2

exhaust system 3.8.1

F

felling 3.1.1

flexible cutting means 3.3.1.3

full-load speed 3.9.10

G

governor 3.9.8

grass-trimmer 3.2.3

H

H 3.6.3

handgrip 3.7.2

handle 3.7.1

harness 3.4.6

high-speed mixture adjuster 3.6.3

hip pad 3.4.7

I

idle-speed adjuster 3.6.1

idling speed 3.9.9

L

L 3.6.2

lawn edge-trimmer 3.2.4

low-speed mixture adjuster 3.6.2

M

maximum power speed 3.9.10

muffler 3.8.1.1

O

output shaft 3.9.6

P

power transmission shaft 3.9.5

primer 3.5.4

Q

quick-release mechanism 3.4.4

R

racing speed 3.9.11

recoil starter 3.5.3.1

retainer 3.4.1

S

saw blade 3.3.1.2

saw blade retainer 3.4.1

shaft tube 3.9.7

shredding 3.1.2

silencer 3.8.1.1

spark arrester 3.8.1.2

starter 3.5.3

stop switch 3.5.2

suspension point 3.4.8

T

T 3.6.1

throttle control latch 3.5.5

throttle linkage 3.5.7

throttle trigger 3.5.6

throttle trigger lockout 3.4.9

transport cover 3.4.3

trimming 3.1.3