ANSI AD3776-3-2009 Tractors and machinery for agriculture - Seat belts - Part 3 Requirements for assemblies.pdf

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1、 ANSI/ASABE AD3776-3:2009 MAY2012 Tractors and machinery for agriculture Seat belts Part 3: Requirements for assemblies American Society of Agricultural and Biological Engineers ASABE is a professional and technical organization, of members worldwide, who are dedicated to advancement of engineering

2、applicable to agricultural, food, and biological systems. ASABE Standards are consensus documents developed and adopted by the American Society of Agricultural and Biological Engineers to meet standardization needs within the scope of the Society; principally agricultural field equipment, farmstead

3、equipment, structures, soil and water resource management, turf and landscape equipment, forest engineering, food and process engineering, electric power applications, plant and animal environment, and waste management. NOTE: ASABE Standards, Engineering Practices, and Data are informational and adv

4、isory only. Their use by anyone engaged in industry or trade is entirely voluntary. The ASABE assumes no responsibility for results attributable to the application of ASABE Standards, Engineering Practices, and Data. Conformity does not ensure compliance with applicable ordinances, laws and regulati

5、ons. Prospective users are responsible for protecting themselves against liability for infringement of patents. ASABE Standards, Engineering Practices, and Data initially approved prior to the society name change in July of 2005 are designated as “ASAE”, regardless of the revision approval date. New

6、ly developed Standards, Engineering Practices and Data approved after July of 2005 are designated as “ASABE”. Standards designated as “ANSI” are American National Standards as are all ISO adoptions published by ASABE. Adoption as an American National Standard requires verification by ANSI that the r

7、equirements for due process, consensus, and other criteria for approval have been met by ASABE. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much

8、 more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. CAUTION NOTICE: ASABE and ANSI standards may be revised or withdrawn at any time. Additionally, procedures of ASAB

9、E require that action be taken periodically to reaffirm, revise, or withdraw each standard. Copyright American Society of Agricultural and Biological Engineers. All rights reserved. ASABE, 2950 Niles Road, St. Joseph, Ml 49085-9659, USA, phone 269-429-0300, fax 269-429-3852, hqasabe.org ANSI/ASABE A

10、D3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 1 ANSI/ASABE AD3776-3:2009 MAY2012 Approved July 2012 as an American National Standard Tractors and machinery for agriculture Seat belts Part 3: Requirements for assemblies These materials are subject to copyrig

11、ht claims of ISO, ANSI, and ASABE. No part of this publication may be reproduced in any form, including an electronic retrieval system, without the prior written permission of ASABE. All requests pertaining to the ANSI/ASABE AD3776-3:2009 (MAY2012) standard should be submitted to ASABE. This standar

12、d was reviewed for adoption by the ASABE Agricultural Machinery Common Test Technical subcommittee, and has been formerly approved by the Power and Machinery Division. Adopted by ASABE May 2012; approved as an American National Standard July 2012. Keywords: Seat belts, Anchorage, Tractors, Self-prop

13、elled machinery 0 Foreword 0.1 ANSI/ASABE AD3776-3:2009, Agricultural Tractors and machinery for agricultureSeat beltsPart 3: Requirement for assemblies, is an adoption with deviations of the identically titled ISO standard ISO 3776-3:2009, Agricultural Tractors and machinery for agricultureSeat bel

14、tsPart 3: Requirement for assemblies. Deviations noted in the following Foreword sections pertain to those provisions where harmonization could not be achieved between ASABE and the International Standard. 0.2 ANSI/ASABE AD3776-3:2009 specifies the requirements for pelvic restraint (seat) belt assem

15、blies intended to be used by the operators of agricultural tractors and self-propelled machinery. 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

16、comply with the requirements of this part of ISO 3776. 0.3 Five normative references are listed in ISO 3776-3:2009. The responsible ASABE committee has reviewed these references and approved the following deviation: 0.3.1 Replace ISO 3776-1, Tractors and machinery for agriculture Seat belts Part 1:

17、Anchorage location requirements, with ASABE/ISO 3776-1:2006, Tractors and machinery for agriculture Seat belts Part 1: Anchorage location requirements. Any reference to ISO 3776-1 in the printed portion of ISO 3776-3 shall be replaced by ASABE/ISO 3776-1:2006. 0.4 This standard has been approved as

18、an American National standard by ANSI (American National Standards Institute). 0.5 This standard deviates from ISO 3776-3:2009 as follows: 0.5.1 See Section 0.3 for Normative reference deviations. Text of ISO 3776-3:2009, Agricultural Tractors and machinery for agricultureSeat beltsPart 3: Requireme

19、nt for assemblies, follows. ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 2 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 se

20、lf-propelled machinery. 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 referen

21、ces The following referenced 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 dim

22、ensions of operators 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 O

23、perating Salt Spray (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

24、 applied to the seat 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 3.3 hardware any metal or rigid plastic part of the rest

25、raint system 3.3.1 buckle and latch plate quick release connector which fastens the belt assembly into a loop ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 3 3.3.2 attachment hardware all load-bearing devices designed for securing the webbing po

26、rtion of a seat belt assembly to a tractor or agricultural 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 m

27、achine NOTE If the seat belt is attached to the seat, the 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

28、 loop complete seat belt assembly as it would be installed 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

29、or roll up transversely, remaining in the form of a rope 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 operati

30、on and roll-over conditions ISO 3776-2 4 Requirements 4.1 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

31、 to provide easy and rapid release of the assembly with a single motion. It shall also be capable of being released 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. Additionally, the

32、 buckle shall be in accordance with 4.3 and 4.4. ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 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

33、 condition shall accommodate in all operating positions an operator in at least the 5th to 95th percentile 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 sha

34、ll not exceed 25 mm for each adjusting device in the assembly. The sum of creep amounts for all 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) % r

35、elative humidity. The test shall be conducted at a temperature between 15 C and 30 C. The test 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

36、. Mark the force-bearing strap material at each adjuster in preparation for measuring creep. 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

37、to the section subjected to the 5 kg mass. c) Apply a reciprocating-motion total amplitude of (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

38、 so as to prevent swaying of the mass and twisting of the belt during testing. The attachment 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 shal

39、l be applied only during the time corresponding to a shift of (100 12) mm of each half cycle. See Figure 1. g) Measure the distance the strap material has moved at each adjusting device. ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 5 Figure 1 C

40、reep test apparatus 4.1.5 Breaking strength 4.1.5.1 Test procedure All the components of three 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

41、restraint does not permit its adjustment to this length. An automatic locking or emergency locking 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 loc

42、ked. b) Orientate the attachment hardware to the strapping as specified in e) below and as shown 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. d) Reduce the

43、tensile force. The buckle release force shall be in accordance with 4.4.3. ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 6 e) Attach the attachment hardware furnished with the seat belt assembly to the anchorage bar. The attaching bolt, with the

44、 listed exceptions, shall be parallel to or at an angle of 45 or 90 to the strapping, whichever results in the greatest angle between 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

45、be installed to produce the maximum angle in use indicated by the installation instructions. 4.1.5.2 Acceptance condition The complete 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

46、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. 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 legibly labell

47、ed 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. 4.1.7 Usage and maintenance instructions When packaged separately, seat belt assemblies shall be accompanied by written i

48、nstructions for ANSI/ASABE AD3776-3:2009 MAY2012 Copyright American Society of Agricultural and Biological Engineers 7 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,

49、and c) proper maintenance (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 Stiffness 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