ISO-11789-1999.pdf
A Reference number ISO 11789:1999(E) INTERNATIONAL STANDARD ISO 11789 First edition 1999-04-01 Powered edgers with rigid cutting means Definitions, safety requirements and test procedures Coupe-bordures à moteur avec organe de coupe rigide Définitions, exigences de sécurité et modes opératoires d'essai ISO 11789:1999(E) © ISO 1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genève 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Contents 1 Scope1 2 Normative references1 3 Definitions 2 4 General construction.4 4.1 Handling (hand-held machine)4 4.2 Power driven components.4 4.3 Heat protection4 4.4 Protection from exhaust fumes.5 4.5 Guard attachment.5 4.6 Electrical requirements5 4.7 Engine (motor) stopping6 4.8 Controls.6 4.9 Identification of controls6 4.10 Fuel tanks6 5 Marking.7 5.1 Machine and blade identification7 5.2 Warnings and symbols.7 5.3 Label requirements.7 6 Safety instructions.8 7 Enclosures and guards (cutting means).8 7.1 Cutting means contact protection Foot probe8 7.2 Thrown object protection.8 7.3 Thrown objects protection test.9 © ISOISO 11789:1999(E) iii 8 Structural integrity.9 8.1 Strength of cutting means.9 9 Sound levels.11 9.1 Test values 11 9.2 Test site .11 9.3 Unit conditions11 9.4 Instrumentation.11 9.5 Microphone position (operator's ear).12 9.6 Test procedure12 10 Vibration .12 10.1 Test conditions.12 10.2 Test procedure12 10.3 Unit operation .14 10.4 Mesurements.14 Annex A (normative) Safety instructions for edgers.31 Annex B (informative) Symbols and/or safety hazard pictorials34 ISO 11789:1999(E)© ISO iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 11789 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 13, Powered lawn and garden equipment. Annex A forms an integral part of this International Standard. Annex B is for information only. INTERNATIONAL STANDARD © ISOISO 11789:1999(E) 1 Powered edgers with rigid cutting means Definitions, safety requirements and test procedures 1 Scope This International Standard specifies mechanical safety requirements and test methods applicable to walk-behind powered edgers that employ rigid cutting means with a blade tip circle not more than 305 mm in diameter, and where the plane of the blade tip circle is designed to operate at not more than 15 from the vertical. This International Standard applies to hand-held portable and powered edgers employing a rigid cutting element with a blade tip circle not more than 305 mm in diameter. This International Standard also includes test methods for noise and vibration. This International Standard does not cover edgers with cutting means of non-metallic filament line or freely pivoting non-metallic cutters. This International Standard does not cover accessories or attachments that alter the function of the machine. The electrical aspects of electrically powered edgers are not covered by this International Standard. For the electrical requirements applicable to electrically driven machines, reference should be made to IEC 60335-1. NOTE For motion control requirements related to self-propelled machines, reference should be made to ISO 5395. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of the IEC and ISO maintain registers of currently valid International Standards. ISO 3304:1985, Plain end seamless precision steel tubes Technical conditions for delivery. ISO 3305:1985, Plain end welded precision steel tubes Technical conditions for delivery. ISO 3306:1985, Plain end as-welded and sized precision steel tubes Technical conditions for delivery. ISO 3767-1:1998, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Symbols for operator controls and other displays Part 1: Common symbols. ISO 3767-3:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Symbols for operator controls and other displays Part 3: Symbols for powered lawn and garden equipment. ISO 3767-5:1992, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Symbols for operator controls and other displays Part 5: Symbols for manual portable forestry machinery. ISO 11789:1999(E)© ISO 2 ISO 3789-1:1982, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Location and method of operation of operator controls Part 1: Common controls. ISO 3789-3:1989, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Location and method of operation of operator controls Part 3: Controls for powered lawn and garden equipment. ISO 4200:1991, Plain end steel tubes, welded and seamless General tables of dimensions and masses per unit length. ISO 5347-0:1987, Methods for the calibration of vibration and shock pick-ups Part 0: Basic concepts. ISO 5348:1998, Mechanical vibration and shock Mechanical mounting of accelerometers. ISO 5349:1986, Mechanical vibration Guidelines for the measurement and the assessment of human exposure to hand-transmitted vibration. ISO 5395:1990, Powered lawn-mowers, lawn tractors, lawn and garden tractors, professional mowers, and lawn and garden tractors with mowing attachments Definitions, safety requirements and test procedures. ISO 11684:1995, Tractors, machinery for agriculture and forestry, powered lawn and garden equipment Safety signs and hazard pictorials General principles. IEC 603351:1991, Safety of household and similar electrical appliances Part 1: General requirements. IEC 60651:1979, Sound level meters. 3 Definitions For the purposes of this International Standard, the following definitions apply: NOTE For different types of machines, see figures 1 and 2, showing a walk-behind and a hand-held edger. 3.1 blade cutting means mechanism used to provide the cutting action of an edger 3.2 blade retainer mechanism which holds the blade to the driving member 3.3 blade guard structure covering a portion of the blade arc 3.4 blade-tip circle path described by the outermost point of the cutting means cutting edge as it rotates about its shaft axis 3.5 clutch mechanism for connecting and disconnecting a driven member to and from a rotating source of power 3.6 debris deflector additional guarding made of flexible material fitted to the unit as an extension of the guard to protect the operator from thrown debris © ISOISO 11789:1999(E) 3 3.7 depth of cut vertical location of the blade-tip circle relative to the surface level NOTE See figure 9. 3.8 edger grass/soil trimming machine where the cutting means operates in a plane approximately perpendicular to the ground NOTE The cutting means is only adjustable within an angle of ± 15 from the vertical. 3.9 governor device that limits the maximum speed of the engine 3.10 guiding handle the front handle of a hand-held portable machine by which the operator supports the least percentage of machine weight NOTE See figure 2. 3.11 handle structure that enables the operator to hold and control the unit during operation 3.12 hand-held supported by hand, possibly assisted by wheel(s) or skids 3.13 maximum engine speed engine speed at wide open throttle, using carburetor settings according to the manufacturer's recommendation or 133 % of the maximum power speed, whichever is less 3.14 maximum governed speed maximum speed an engine is capable of attaining, equal to the greater of the value of the speed when limited by a governor (3.9) or other means, and the value declared by the manufacturer. 3.15 normal operation use of the machine which is reasonably foreseeable, as seen by the ordinary user, and which is consistent with such activities as cutting grass, starting, stopping, fueling, or connecting to (or disconnecting from) a power source 3.16 operator control control requiring operator actuation to perform specific functions 3.17 starter mechanism that rotates the engine to start it ISO 11789:1999(E)© ISO 4 3.18 support handle handle of a hand-held portable machine by which the operator supports the greatest percentage of the product weight 3.19 throttle device that adjusts the volume of fuel and air mixture delivered to the combustion chamber of an internal combustion engine 3.20 unit machine complete edger 3.21 walk-behind normally controlled by an operator walking behind a ground-supported unit 4 General construction 4.1 Handling (hand-held machine) A hand-held edger shall be provided with two separate handles. The handles shall: a) be fixed in position, except that the guiding handle may be adjustable; b) be located so that the distance (D), measured in a horizontal plane, between the rearmost portion of the blade- tip circle and the foremost position (as defined by the manufacturer) of the guiding handle is at least 450 mm. See figure 3. 4.2 Power driven components All power driven components except any part of a component functioning in contact with the soil; any axle of a ground wheel; shall be guarded to prevent human contact with these parts during normal operation. The principles set out in ISO 5395:1990, annex A, shall be followed when developing a guarding system. 4.3 Heat protection 4.3.1 Requirements A guard shall be provided to prevent accidental contact with any exposed engine exhaust components with a hot surface area greater than 10 cm2 and with a temperature greater than 80 C at (20 C ± 3 C) ambient temperature during normal operation of the machine. For purposes of this requirement, the guard is considered part of the exposed engine exhaust components. 4.3.2 Test equipment The measuring equipment shall have an accuracy of ± 4 C. 4.3.3 Test method The test shall be conducted in the shade on a hard, flat and level surface. The engine shall be operated at its maximum engine or governed speed (whichever is appropriate) until the surface temperature stabilizes. © ISOISO 11789:1999(E) 5 Temperatures shall be determined by correcting the observed temperature by the difference between the specified ambient and the test ambient temperature. Identify the hot surface area(s) on the engine exhaust system. When the distance between the identified hot area and the nearest control is in excess of 100 mm, cone A in figure 4 shall be used. For a distance less than 100 mm between the identified hot area and the nearest control, cone B in figure 4 shall be used. Move cone A, with the axis of the cone anywhere between 0 and 180 to the horizontal with the nose or point of the cone in a downward to horizontal direction towards the hot surface. The cone shall not be moved upwards. When moving the cone, determine if contact is made with the hot surface area(s) with the cone tip or conical surface of the cone. Move cone B in any direction. 4.3.4 Test acceptance The tip or conical surface of cone A or B shall not be able to make contact with a hot surface area greater than 10 cm2 of the exhaust system. 4.4 Protection from exhaust fumes Engine exhaust shall not be directed toward the operator during normal operation. 4.5 Guard attachment All guards required under 4.2, 4.3 and 7 shall be permanently attached to the machine and shall not be detachable without the use of tools, or the construction of the machine shall be such that it cannot be used without the guard in its guarding position. 4.6 Electrical requirements For electrical requirements for electrically driven machines see IEC 60335-1. 4.6.1 Battery circuits The requirements in 4.6.1.1, 4.6.1.2, 4.6.1.3 and 4.6.1.4 apply only to battery circuits of less than 42 V. 4.6.1.1 Electrical cables Electrical cables shall be protected if located in potentially abrasive contact with the metal surfaces. The wiring assembly shall, where possible, be grouped together, be properly supported, and be located so that no portion is in contact with the carburetor, metallic fuel lines, the exhaust system, moving parts or sharp edges. Any edges of metal members likely to be in contact with the cables shall be rounded or protected to prevent possible damage to the cables by cutting or abrasion. 4.6.1.2 Battery installation The compartment for a vented storage battery shall have an opening to provide ventilation and drainage. When the battery is in the operating position, acid shall not leak onto parts that would be affected to the extent that a hazard would be created from corrosion. 4.6.1.3 Overload protection All circuits, except starter motor and high-tension ignition circuits, shall be provided with overload protection devices in the ungrounded line near the battery terminal or starter cable. The overload protection may be located in either wire of a two-wire system. This requirement need not apply to battery-powered machines capable of passing the following test. With the motor shaft locked to prevent rotation, connect it to its fully charged integral battery and leave it in that condition until the battery is discharged or failure of any component takes place. The machine shall not emit flames ISO 11789:1999(E)© ISO 6 or molten metal. Any internal explosion shall be contained so as not to cause any material to be ejected from the machine 4.6.1.4 Terminals and uninsulated electrical parts Terminals and uninsulated electrical parts and two-wire non-grounded systems shall be protected against short- circuiting by the fuel can, or tools, during normal refuelling and lubrication servicing. 4.6.2 Ignition circuits 4.6.2.1 Ignition interruption or short-circ
