1、BRITISH STANDARD BS ISO 5057:1993 Industrial trucks Inspection and repair of fork arms in service on fork-lift trucks ICS 53.060BSISO 5057:1993 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and c
2、omes intoeffect on 15 October1998 BSI 05-1999 ISBN 0 580 30457 4 National foreword This British Standard reproduces verbatim ISO5057:1993 and implements it as the UK national standard. It supersedes BS5639-5:1978 which is withdrawn. The UK participation in its preparation was entrusted to Technical
3、Committee MHE/7, Industrial trucks, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and E
4、uropean developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI St
5、andards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsibl
6、e for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, theISO title page, page ii, pages1 and2 and a back cover. This standard has bee
7、n updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO5057:1993 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword ii 1 Sc
8、ope 1 2 Normative references 1 3 Definitions 1 4 Inspection intervals 1 5 Inspection 1 6 Repair and testing 1 Table 1 Test load for yield test 2ii blankBSISO5057:1993 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodi
9、es (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
10、, 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
11、 to the member bodies for voting. Publication as an International Standard requires approval by at least75%of the member bodies casting a vote. International Standard ISO5057 was prepared by Technical Committee ISO/TC110, Industrial trucks, Sub-Committee SC2, Safety of powered industrial trucks. Thi
12、s first edition of ISO5057 cancels and replaces the first edition of ISO/TR5057 published in1977, of which it constitutes a technical revision. Descriptors: Handling equipment, industrial trucks, lift trucks, fork trucks, fork arms, inspection, repairs, tests.BSISO5057:1993 BSI 05-1999 1 1 Scope Thi
13、s International Standard specifies methods for inspection and repair of solid-section fork arms in use on all types of fork-lift trucks. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At t
14、he 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 IEC and ISO
15、 maintain registers of currently valid International Standards. ISO 2330:1974, Fork lift trucks Fork arms Technical characteristics and testing. ISO 2331:1974, Fork lift trucks Hook-on type fork arms Vocabulary. 3 Definitions For the purposes of this International Standard, the definitions given in
16、ISO2331 apply. 4 Inspection intervals Fork arms in service shall be inspected in accordance with clause5 at intervals of not more than12 months and whenever any defect or permanent deformation is detected. Severe applications may require more frequent inspections. 5 Inspection 5.1 General The inspec
17、tion of a fork arm shall be carried out carefully by trained personnel with the aim of detecting any damage, failure, deformation,etc., which may impair safe use. Any fork arm which shows such a defect shall be withdrawn from service, and not be returned to service unless it has been satisfactorily
18、repaired and tested in accordance with6.2 if applicable. 5.2 Surface cracks The fork arm shall be thoroughly examined visually for cracks and, if considered necessary, subjected to a non-destructive crack detection process. Special attention shall be paid to the heel and the top and bottom hooks inc
19、luding their attachment to the shank. The fork arm shall be withdrawn from service if surface cracks are detected. 5.3 Difference in height of fork tips A set of fork arms shall be checked for any difference in height when mounted on the fork carrier. If the difference in tip heights exceeds3%of the
20、 blade length or that recommended by the truck manufacturer, the set of fork arms shall be withdrawn from service. The set of fork arms shall not be returned to service until they have been re-set as necessary (see6.1) and tested in accordance with6.2. 5.4 Positioning lock It shall be confirmed that
21、 the positioning lock, where originally provided, is in good repair and correct working order. If any fault is found, the fork arm shall be withdrawn from service until satisfactory repairs have been effected. 5.5 Legibility of marking If the fork arm marking in accordance with ISO2330 is not clearl
22、y legible, the fork arm shall be removed from service. 5.6 Wear 5.6.1 Fork arm blade and shank The fork arm blade and shank shall be thoroughly checked for wear, special attention being paid to the vicinity of the heel. If the thickness of the blade or shank is reduced to90%of the original thickness
23、, or to the minimum thickness specified by the fork arm or truck manufacturer, the fork arm shall be withdrawn from service. 5.6.2 Fork arm mountings The support face of the top hook and the retaining faces of both hooks shall be checked for wear, crushing and other local deformations. If these defe
24、cts are apparent to such an extent that the clearance between the fork arm and the fork carrier becomes excessive, the fork arm shall be withdrawn from service. For other types of mounting, similar checks shall be carried out. 6 Repair and testing 6.1 Repair Only the manufacturer of the fork arm or
25、an expert of equal competence shall decide if a fork arm may be repaired for return to service. The repairs shall only be carried out in accordance with the recommendations of the fork arm manufacturer. It is not recommended that surface cracks or wear be repaired by welding.BSISO 5057:1993 2 BSI 05
26、-1999 When repairs necessitating re-setting are required, the fork arm shall subsequently be subjected to an appropriate heat-treatment, as necessary. 6.2 Yield test A fork arm that has undergone repairs other than repair or replacement of the positioning lock and/or the marking shall only be return
27、ed to service after being submitted to, and passing, the yield test described in ISO2330, except that the test load shall be in accordance withTable 1. Table 1 Test load for yield test Values in kilograms Fork arm specified capacity, m Test load, F t m 5000 2,1mblankBS ISO 5057:1993 BSI 389 Chiswick
28、 High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amend
29、ment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard woul
30、d inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of sta
31、ndards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been publi
32、shed as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available wh
33、ich give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefit
34、s contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988
35、 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details suc
36、h as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
