1、BS ISO3776-3:2009ICS 65.060.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDTractors andmachinery foragriculture SeatbeltsPart 3: Requirements for assembliesThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 3
2、0 June2009. BSI 2009ISBN 978 0 580 59019 1Amendments/corrigenda issued since publicationDate CommentsBS ISO 3776-3:2009National forewordThis British Standard is the UK implementation of ISO 3776-3:2009.The UK participation in its preparation was entrusted to TechnicalCommittee AGE/6, Agricultural tr
3、actors and forestry machinery.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard
4、cannot confer immunityfrom legal obligations.BS ISO 3776-3:2009Reference numberISO 3776-3:2009(E)ISO 2009INTERNATIONAL STANDARD ISO3776-3First edition2009-06-15Tractors and machinery for agriculture Seat belts Part 3: Requirements for assemblies Tracteurs et matriels agricoles Ceintures de scurit Pa
5、rtie 3: Exigences relatives aux assemblages BS ISO 3776-3:2009ISO 3776-3:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to
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8、s found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 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 an
9、d microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii
10、 ISO 2009 All rights reservedBS ISO 3776-3:2009ISO 3776-3:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Requirements 2 4.1 General. 2 4.2 Strap material requirements 6 4.3 Hardware requirements 8 4.4 Additional r
11、equirements for buckles 9 Bibliography . 13 BS ISO 3776-3:2009ISO 3776-3:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
12、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 pa
13、rt 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/IEC Directives, Part 2. The main task of technical committees is to
14、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 member bodies casting a vote. Attention is drawn to the possibility th
15、at some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3776-3 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 2, Common test
16、s. ISO 3776 consists of the following parts, under the general title Tractors and machinery for agriculture Seat belts: Part 1: Anchorage location requirements Part 2: Anchorage strength requirements Part 3: Requirements for assemblies BS ISO 3776-3:2009INTERNATIONAL STANDARD ISO 3776-3:2009(E) ISO
17、2009 All rights reserved 1Tractors and machinery for agriculture Seat belts Part 3: Requirements for assemblies 1 Scope This part of ISO 3776 specifies the requirements for pelvic restraint (seat) belt assemblies intended to be used by the operators of agricultural tractors and self-propelled machin
18、ery. NOTE Seat belt assemblies that meet the requirements of UNECE R16:2000, Clause 6, but excluding 6.4 of that regulation, or seat belt assemblies complying with the requirements of SAE J386 are deemed to comply with the requirements of this part of ISO 3776. 2 Normative references The following r
19、eferenced documents are indispensable 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 3411, Earth-moving machinery Physical dimensions of operator
20、s and minimum operator space envelope ISO 3776-1, Tractors and machinery for agriculture Seat belts Part 1: Anchorage location requirements ISO 3776-2:2007, Tractors and machinery for agriculture Seat belts Part 2: Anchorage strength requirements ASTM B117, Standard Practice for Operating Salt Spray
21、 (Fog) Apparatus ASTM D756:1993, Practice for Determination of Weight and Shape Changes of Plastics Under Accelerated Service Conditions 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 anchorage provision to transfer forces applied to the sea
22、t belt assembly to the structure of the tractor or the machine ISO 3776-2 3.2 creep amount of unintentional lengthening of the seat belt assembly loop during use caused by motion of the machine, seat and seat-belted occupant BS ISO 3776-3:2009ISO 3776-3:2009(E) 2 ISO 2009 All rights reserved3.3 hard
23、ware any metal or rigid plastic part of the restraint system 3.3.1 buckle and latch plate quick release connector which fastens the belt assembly into a loop 3.3.2 attachment hardware all load-bearing devices designed for securing the webbing portion of a seat belt assembly to a tractor or agricultu
24、ral machine structure or intermediate structural component including but not limited to retractors, end fittings, bolts, studs, nuts or other attachment means, but not including those components permanently fixed to the tractor or agricultural machine NOTE If the seat belt is attached to the seat, t
25、he seat is not considered to be attachment hardware. 3.3.3 adjustment hardware mechanisms designed for adjusting the belt assembly to fit the user, including such devices that may be integral with a buckle, attachment mechanism, or retractor 3.4 loop complete seat belt assembly as it would be instal
26、led around the seat occupant 3.5 polyester yarn yarn spun from polyethylene terephthalate 3.6 retractor device for storing all or part of the strap material of a seat belt assembly 3.7 roping tendency of a piece of material to twist upon itself or roll up transversely, remaining in the form of a rop
27、e instead of staying in its original strap form 3.8 seat belt assembly belt, including any buckle, length adjustor, retractor, and means for securing to an anchorage, that fastens across the pelvic area to provide pelvic restraint during operation and roll-over conditions ISO 3776-2 4 Requirements 4
28、.1 General 4.1.1 Single occupancy A seat belt assembly shall be designed for use by only one person and at any one time. 4.1.2 Release A seat belt assembly shall be provided with a buckle or latch readily accessible to the occupant, and designed to provide easy and rapid release of the assembly with
29、 a single motion. It shall also be capable of being BS ISO 3776-3:2009ISO 3776-3:2009(E) ISO 2009 All rights reserved 3released with either hand, bare or gloved. The buckle shall be designed to minimize the possibility of accidental release due to operator movement, inertia or external forces. Addit
30、ionally, the buckle shall be in accordance with 4.3 and 4.4. 4.1.3 Adjustment The seat belt shall be self-adjusting or readily adjustable by a means within easy reach of the seat occupant. Adjustment to a snug condition shall accommodate in all operating positions an operator in at least the 5thto 9
31、5thpercentile as defined in ISO 3411. 4.1.4 Creep 4.1.4.1 General Two seat belt assemblies of the same part number with adjusting devices shall be tested in accordance with 4.1.4.2 and 4.1.4.3. The creep shall not exceed 25 mm for each adjusting device in the assembly. The sum of creep amounts for a
32、ll adjusting devices in the belt assembly shall not exceed 40 mm. 4.1.4.2 Conditions Two seat belt assemblies of the same part number shall be conditioned for 24 h at a temperature of (20 5) C and (65 5) % relative humidity. The test shall be conducted at a temperature between 15 C and 30 C. The tes
33、t apparatus shall conform to that shown in Figure 1 for tests 1 and 2. 4.1.4.3 Test procedure Before starting the tests, complete 20 cycles of the reciprocating motion described in c) to remove initial slack. Mark the force-bearing strap material at each adjuster in preparation for measuring creep.
34、a) Mount the belts as shown in Figure 1 for tests 1 and 2. b) Apply a 5 kg mass to the lower end of each belt assembly. If there is a free end serving as a reserve strap, it shall not be fastened or clipped to the section subjected to the 5 kg mass. c) Apply a reciprocating-motion total amplitude of
35、 (300 20) mm to the top end of each belt assembly. d) Ensure that the strap in the slack position maintains contact with the full length of the body block on the test bench. e) Guide the 5 kg mass vertically so as to prevent swaying of the mass and twisting of the belt during testing. The attachment
36、 shall be fixed to the 5 kg mass in the same manner as in the tractor or agricultural machine. f) Complete 1 000 cycles at a frequency of 0,5 Hz at the reciprocation motion of (300 20) mm. The 5 kg mass shall be applied only during the time corresponding to a shift of (100 12) mm of each half cycle.
37、 See Figure 1. g) Measure the distance the strap material has moved at each adjusting device. BS ISO 3776-3:2009ISO 3776-3:2009(E) 4 ISO 2009 All rights reservedDimensions in millimetres Test 1 Body block Test 2 Straight pull Key 1 start position 7 arc of travel 30 cycles minimum 2 mass guide 8 stee
38、l surface 3 maximum travel point 2 9 travel of point 1 4 taut position 10 point 1 (start position) 5 point 2 (start position) 11 attachment to oscillating device 6 buckle assembly 12 fixed surface Figure 1 Creep test apparatus 4.1.5 Breaking strength 4.1.5.1 Test procedure All the components of thre
39、e seat belt assemblies shall be tested. a) Adjust the pelvic restraint between seat belt anchorages to a length between 914 mm and 1 219 mm, or as near to this length as possible if the design of the pelvic restraint does not permit its adjustment to this length. An automatic locking or emergency lo
40、cking retractor, when included in a seat belt assembly, shall be locked at the start of the test with a tension in the strapping slightly in excess of the retractile force, in order to keep the retractor locked. b) Orientate the attachment hardware to the strapping as specified in e) below and as sh
41、own in Figure 2. c) Apply a tensile force of (11,1 0,1) kN to the components in any convenient manner: the extension between anchorages under this force shall not increase by more than 500 mm. BS ISO 3776-3:2009ISO 3776-3:2009(E) ISO 2009 All rights reserved 5d) Reduce the tensile force. The buckle
42、release force shall be in accordance with 4.4.3. e) Attach the attachment hardware furnished with the seat belt assembly to the anchorage bar. The attaching bolt, with the listed exceptions, shall be parallel to or at an angle of 45 or 90 to the strapping, whichever results in the greatest angle bet
43、ween strapping and attachment hardware. Eye bolts shall be vertical, and the attaching bolts of a seat belt assembly designed for use in specific models of machines shall be installed to produce the maximum angle in use indicated by the installation instructions. 4.1.5.2 Acceptance condition The com
44、plete seat belt assembly, including strapping, straps, buckles, adjustment and attachment hardware and retractors, shall withstand a tensile force of not less than 11,1 kN i.e. each structural component of the assembly shall withstand a force of 11,1 kN when tested by the procedure of 4.1.5.1. Key 1
45、 testing machine 6 swivel plate 2 webbing 7 buckle 3 anchorage bar 8 rigid adapter 4 example attachment 9 angle bracket 5 space washer Figure 2 Loop force testing machine 4.1.6 Marking (labelling) Each conformant seat belt assembly and/or section of the seat belt assembly shall be permanently and le
46、gibly labelled with the following: reference to this part of ISO 3776 (i.e. “ISO 3776-3:2009”); year of manufacture; model or style number; name or trademark of the manufacturer or importer. BS ISO 3776-3:2009ISO 3776-3:2009(E) 6 ISO 2009 All rights reserved4.1.7 Usage and maintenance instructions W
47、hen packaged separately, seat belt assemblies shall be accompanied by written instructions for a) installation, including the proper manner of threading the strap into the attachment hardware when threadable hardware is supplied, b) correct wearing of the installed assembly, and c) proper maintenanc
48、e (including cleaning procedures) and periodic inspection for wear or damage. 4.2 Strap material requirements 4.2.1 Material The strap material shall have resistance to mild acids, alkalies, mildew, aging, moisture and sunlight equal to or better than that of untreated polyester yarn. 4.2.2 Stiffnes
49、s In order to minimize roping, the strap material shall be woven and/or treated to produce stiffness in the transverse direction. The stiffness shall be effective for the usable life of the strap. The strap shall be flexible in the longitudinal direction to permit adjustment at 40 C. 4.2.3 Colour Preferred colours are those recommended by the strap material manufacturer as being less sensitive to ultraviolet rays. 4.2.4 Width The strap material shall not be less than 46 m
