1、 ANSI/ASAE S338.5 MAY2006 (R2016) Field Equipment for Agriculture Safety Chain for Towed Equipment American Society of Agricultural and Biological Engineers ASABE is a professional and technical organization, of members worldwide, who are dedicated to advancement of engineering applicable to agricul
2、tural, 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 equipment, structures
3、, 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 advisory only. Their use
4、 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 regulations. Prospective user
5、s 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. Newly developed Standard
6、s, 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 requirements for due p
7、rocess, 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 more than a simple m
8、ajority, 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 CAUTION NOTICE: ASABE and ANSI standards may be revised or withdrawn at any time.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 ASABE require that action
9、 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/ASAE S338.5 MAY2006 (R2016)
10、Copyright American Society of Agricultural and Biological Engineers 1 ANSI/ASAE S338.5 MAY2006 (R2016) Revision approved MAY 2006; reaffirmed January 2016 as an American National Standard Field Equipment for Agriculture Safety Chain for Towed Equipment Proposed by the Engineering Policy Committee of
11、 Farm and Industrial Equipment Institute; approved by ASAE Power and Machinery Division Standards Committee; adopted by ASAE as a Recommendation December 1970; reaffirmed December 1975; reclassified as a Standard March 1978; reaffirmed December 1980; approved as an American National Standard Decembe
12、r 1982; revised June 1984, October 1988; revised editorially January 1990; reaffirmed July 1993; revised May 1996, November 1997, May 2006; reaffirmed February 2011, January 2016. Keywords: Chain, Drawbar, Hitch, Safety 1 Scope 1.1 This Standard covers the specifications for an auxiliary attaching s
13、ystem to retain a connection between towing and towed agricultural field equipment in the event of separation of the primary attaching system long enough to bring the machines to a stop. It should not be construed that this auxiliary system can ensure that control or connection will be maintained in
14、 the event of incidents such as loss of control, rollover, jackknife, or collision. 1.2 This Standard applies to all combinations of towing and towed agricultural field equipment when traveling on highways. Requirements for braking of towed equipment and recommendations for maximum travel speeds are
15、 given in ASAE S365.6. 2 Normative References 2.1 The following standard contains provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the edition was valid. All standards are subject to revision, and parties to agreements based on thi
16、s Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Standards organizations maintain registers of currently valid standards. 2.1.1 ANSI/ASAE S365.6 APR2000, Braking System Test Procedures and Braking Performance Criteria for A
17、gricultural Field Equipment. 2.1.2 ASAE S390.4 JAN2005, Definitions and Classifications of Agricultural Field Equipment. 3 Definitions 3.1 highway: the entire width between the boundary lines of every way publicly maintained when any part thereof is open to use of the public for purposes of vehicula
18、r travel (Uniform Vehicle Code) 3.2 agricultural field equipment: agricultural tractors, self propelled machines, implements, and combinations thereof designed primarily for agricultural field operations. ASAE S390.4 provides definitions for types of agricultural field equipment. In this standard, m
19、achine refers to agricultural field equipment. ANSI/ASAE S338.5 MAY2006 (R2016) Copyright American Society of Agricultural and Biological Engineers 2 3.3 towing machine: any unit of agricultural field equipment that furnishes the forces necessary to move and control a towed machine 3.4 towed machine
20、: any unit of agricultural field equipment whose motive force and directional control is derived from one point of attachment to a towing machine. In a series of more than two machines, the same unit may be both a towed and a towing machine. 3.5 primary attaching system: the means by which the motiv
21、e and controlling forces are transferred from the towing to the towed machine under ordinary operating circumstances. The primary attaching point is the principal location of articulation in the system. 3.6 auxiliary attaching system: a supplementary attaching means intended to retain a connection b
22、etween the towing and towed machines in the event of failure of the primary attaching system. A safety chain is the preferred means for providing an auxiliary attaching system function. While the use of chain is preferred, nothing in this standard shall require the use of a chain, or preclude the us
23、e of an alternate attachment system which will effectively maintain connection between towing and towed machines in the event of separation of the primary attaching system as defined above and meet the system specifications outlined in section 5. 3.7 safety chain: a chain, of designated size and str
24、ength, equipped with a latching hook on one end and a suitable attachment link on the other end for permanent chain installations. Pass through links may be used for the attachment link for non permanent installations. 4 Safety Chain Specifications 4.1 The safety chain, its hook, and its end fitting
25、 including pins shall conform to the specifications given in Table 1 and illustrated in Figure 3. Other alternative configurations for end fittings and hooks are permissible as long as the chain can be securely retained by the latching mechanism regardless of chain tension. The hook must stay in con
26、tact with the same chain link as originally connected. Figure 1 Example auxiliary attaching system with intermediate support ANSI/ASAE S338.5 MAY2006 (R2016) Copyright American Society of Agricultural and Biological Engineers 3 Figure 2 Example auxiliary attaching system Table 1 Safety chain specifi
27、cations Intermediate chain sizes to those listed in the table are permissible as long as the chain can pass through nearest smaller opening listed in the table. Minimum ultimate strength as used in this standard refers to the minimum breaking strength of the chain. This is different than the working
28、 load limit of the chain as is commonly used for lifting devices. Minimum Ultimate System Strength kN (lbf) Maximum Chain Link Diameter (see Figure 3) mm (in.) Minimum Fitting Hole Size (see Figure 3) mm (in.) Dimensions A, B, C,1)(see Figures 1 b) located within 230 mm (9.0 in.) laterally and verti
29、cally from the projection along the line of travel of the primary attaching point; c) located so that no more than the minimum chain length ahead of the primary attaching point, as listed in Table 1, is required for fastening; d) preferably located to the left side of the primary hitch for operation
30、al convenience; 5.2.2 The towed machine attaching point shall be: a) located within 230 mm (9.0 in.) laterally and vertically from the projection along the line of travel of the primary attaching point; b) preferably located to the left side of the primary hitch for operational convenience and, if t
31、he chain is not permanently attached; c) of such form that it may be encompassed by the chain described in 4.2. 5.2.3 Intermediate support(s) shall be provided if the distance along the line of travel from the primary attaching point to the towed or towing machine attaching point exceeds dimension A
32、 in Table 1, and the support(s) shall be located within dimension A from the primary attaching point. Intermediate support(s) are to provide vertical and lateral support for the chain and to keep the chain in close proximity to the primary attaching system. 5.3 Auxiliary attaching system component s
33、trength 5.3.1 Safety chains including hooks, pass through links, end fittings, and pins when used as auxiliary attaching systems shall have a minimum strength sufficient to support the gross weight of the towed machine for towed machines weighing up to 36,300 kg (80,000 lbf). For towed machines weig
34、hing above 36,300 kg (80,000 lbf), the chain strength shall be limited to 356 kN (80,000 lbf). The requirements outlined above apply to the towed machine attaching point. Also, the requirements apply to other types of auxiliary attaching systems. 5.3.2 The towing machine attaching point strength sha
35、ll be of sufficient strength to support, along the line of travel, the gross weight of the towing machine. 5.3.3 Intermediate supports shall be of sufficient strength to support forces equal to one half of the minimum auxiliary attaching system strength, applied in any direction. ANSI/ASAE S338.5 MA
36、Y2006 (R2016) Copyright American Society of Agricultural and Biological Engineers 6 6 User Instructions 6.1 Instructions related to auxiliary attaching systems should be located in the section of the Operators Manual of towing and towed machines providing information for on-highway travel requiremen
37、ts including towed machine travel speed restrictions. Information provided should include: a) the intended attaching point and suggested attachment method; b) placement of intermediate support, if required; c) allowing no more slack than necessary for articulation; Note: In all cases, hydraulic line
38、s and/or electrical cables used to operate the towed machines braking system, if so equipped, shall have more slack than the auxiliary attaching system so that if a failure of the primary attaching system should occur, trailer braking shall still be possible. d) not using an intermediate support as the primary attaching point; e) storage of the safety chain when not in use; f) the need to replace the safety chain if one or more links or end fittings are broken, stretched or otherwise damaged or deformed.
