1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58power transmission Guard opening without toolICS 65.060.01Agricultural machinery Guards for moving
2、parts of DRAFT FOR DEVELOPMENTDD ISO/TS 28924:2007DD ISO/TS 28924:2007This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 29 June 2007 BSI 2007ISBN 978 0 580 53014 2an international Standard, to extend the life of the Technical Specification
3、 or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery.A
4、 list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Amendments issued since publicationAmd. No. Date Commentsthat UK
5、 experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publication will be initiated not later than 3 years after its publication by the international organization so that a decision can be taken on its status. Noti
6、fication of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into National forewordThis Draft for
7、Development was published by BSI. It is the UK implementation of ISO/TS 28924:2007.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so th
8、at information and experience of its practical application can be obtained.Comments arising from the use of this Draft for Development are requested so Reference numberISO/TS 28924:2007(E)TECHNICAL SPECIFICATION ISO/TS28924First edition2007-02-15Agricultural machinery Guards for moving parts of powe
9、r transmission Guard opening without tool Matriel agricole Protecteurs pour lments mobiles de transmission de puissance Protecteur ouverture sans outil DD ISO/TS 28924:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (
10、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, go
11、vernmental 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. International Standards are drafted in accordance with the rules given in the ISO/IE
12、C Directives, Part 2. The main task of technical committees is to prepare International Standards. 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 memb
13、er bodies casting a vote. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical exp
14、erts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it i
15、s approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is revi
16、ewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying
17、any or all such patent rights. ISO/TS 28924 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 3, Safety and comfort. DD ISO/TS 28924:2007iv Introduction The structure of safety standards in the field of machinery is as follows. a) Typ
18、e-A standards (basis standards) give basic concepts, principles for design, and general aspects that can be applied to machinery. b) Type-B standards (generic safety standards) deal with one or more safety aspect(s) or one or more type(s) of safeguards that can be used across a wide range of machine
19、ry: type-B1 standards on particular safety aspects (e.g. safety distances, surface temperature, noise); type-B2 standards on safeguards (e.g. two-hands controls, interlocking devices, pressure sensitive devices, guards); c) Type-C standards (machinery safety standards) deal with detailed safety requ
20、irements for a particular machine or group of machines. This Technical Specification is a type-C standard as stated in ISO 12100-1. When provisions of this type-C standard are different from those which are stated in type-A or type-B standards, the provisions of this type-C standard take precedence
21、over the provisions of the other standards for machines that have been designed and built according to the provisions of this type-C standard. DD ISO/TS 28924:20071Agricultural machinery Guards for moving parts of power transmission Guard opening without tool 1 Scope This Technical Specification giv
22、es safety requirements, and the means of verifying them, for the design and construction of guards, able to be opened without a tool, which are used to guard the moving parts of the power transmission of self-propelled ride-on machines and mounted, semi-mounted or trailed machines used in agricultur
23、e. In addition, it specifies the type of information on safe working practices (including residual risks) to be provided by the manufacturer. It deals with the significant hazards (as listed in Annex A), hazardous situations and events relevant to guards of moving parts of power transmission used as
24、 intended and under the conditions foreseen by the manufacturer (see Clauses 4 and 5). It is not applicable to guards for moving parts of the power transmission of tractors, aircraft, air cushion vehicles, or lawn and garden equipment. 2 Normative references The following referenced documents are in
25、dispensable for the application 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 4254-1, Agricultural machinery Safety Part 1: General requirements ISO 13852:1996, Saf
26、ety of machinery Safety distances to prevent danger zones being reached by the upper limbs 3 Terms and definitions For the purpose of this document, the terms and definitions given in ISO 4254-1 apply. DD ISO/TS 28924:20072 4 Moving parts for power transmission 4.1 Power transmission moving parts wh
27、ich generate hazards shall be guarded by location, by safety distance or with fixed guarding. 4.2 The design of guards shall take into consideration the risk to the operator, the proper functioning of the machine and the generation of other hazards such as drainage, avoidance of debris accumulation
28、or blockages and the impediment of a machines material handling functions. 4.3 Guards shall be designed such that normal operation and service of the machine can be readily carried out. 4.4 Guards may be formed of a rigid mesh or grille. The size of the opening permitted depends on the distance betw
29、een the guard and the hazard/hazardous area (see ISO 13852:1996, Table 1, 3, 4 or 6). The design of the guard shall be such that it is not possible to distort the mesh or the grille during normal operation and use such that the opening size and distance relationship exceeds the limits in accordance
30、with ISO 13852. 4.5 If normal access is foreseen for example, for adjustment or maintenance guards shall be used and, where practical, shall be of a type which remains attached to the machine (e.g. by means of hinges or tethers). 4.6 Machines with access doors or guards which can be opened or remove
31、d to expose machine elements which continue to rotate or move after the power is disengaged shall have, in the immediate area, a readily visible evidence of rotation, or an audible indication of rotation, or a suitable safety sign (see 6.1. and 6.2). 4.7 The strength of the guards shall comply with
32、ISO 4254-1. 5 Verification of safety requirements or protective measures See Table 1. Table 1 List of safety requirements and/or protective measures and their verification Verification Clause/subclause Inspection Measurement Procedure/reference 4.5 X Shall be verified by carrying out adjustment or m
33、aintenance operations described in the operators manual. 6 Information for use 6.1 Operators manual The manual shall include warnings about the significant residual risks and how these are to be controlled, as well as any training requirements (see 4.6). 6.2 Safety and instructional signs A safety s
34、ign shall be provided on access doors or guards to indicate the rotation of parts, if applicable (see 4.6). DD ISO/TS 28924:20073Annex A (informative) List of significant hazards Table A.1 specifies the significant hazards, significant hazardous situations and significant hazardous events that have
35、been identified as being significant to the guards for moving parts of power transmissions covered by this Technical Specification and which require specific action by the designer or manufacturer to eliminate or reduce the risk. Table A.1 List of significant hazards Clause/ subclause of ISO 4254-1
36、Hazard Hazardous situation and event Clause(s)/subclause of ISO/TS 28924A.1 Mechanical hazards A.1.1 Crushing hazard Power transmission parts 4; 6 A.1.2 Shearing hazard Power transmission parts 4; 6 A.1.4 Entanglement hazard Power transmission parts 4; 6 A.1.5 Drawing-in or trapping hazard Power tra
37、nsmission parts 4; 6 A.14 Break-up during operation Guards 4.7 A.19.4 Mechanical hazards at the working position: a) contact with power transmission parts Guards 4; 6 DD ISO/TS 28924:20074 Bibliography 1 ISO 12100-1:2003, Safety of machinery Basic concepts, general principles for design Part 1: Basi
38、c terminology, methodology DD ISO/TS 28924:2007blankDD ISO/TS BSI389 Chiswick High RoadLondonW4 4AL28924:2007BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international leve
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