1、BRITISH STANDARD BS 2838-1: 1988 Examination and general treatment couches Part 1: Specification for fixed height couches UDC 615.478.6BS2838-1:1988 This British Standard, having been prepared under the directionof the Health Care Standards Committee, was published under the authorityofthe Board of
2、BSIandcomes intoeffect on 30November1988 BSI 12-1999 First published as BS 2838 March1957 First revision March 1972 Second revision as BS 2838-1 The following BSI references relate to the work on this standard: Committee reference HCC/31 Draft for comment 86/52185 DC ISBN 0 580 16598 1 Committees re
3、sponsible for this British Standard The preparation of this British Standard was entrusted by the Health Care Standards Committee (HCC/-) to Technical Committee HCC/31, upon which the following bodies were represented: Associated Offices Technical Committee Association of British Paediatric Nurses A
4、ssociation of National Health Service Supplies Officers British Paediatric Association British Surgical Trades Association Incorporated Chartered Society of Physiotherapy Department of Health and Social Security Health Service Supply Council Independent Engineering Insurers Committee King Edwards Ho
5、spital Fund for London Royal College of Midwives Royal College of Nursing and National Council for the Nurses of the UnitedKingdom Stainless Steel Fabricators Association of Great Britain Amendments issued since publication Amd. No. Date of issue CommentsBS2838-1:1988 BSI 12-1999 i Contents Page Com
6、mittees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Design 1 4 Performance 4 5 Marking 5 Appendix A Recommendations for the information to be provided by a purchaser to a manufacturer or supplier 6 Appendix B Static load test 6 Appendix C Impact energy test 6 Appendix D Cy
7、clic loading test 8 Appendix E Static load test for the head section 9 Appendix F Durability test for the head section 9 Appendix G Durability test for the frame 9 Appendix H Static load test for the body section 10 Appendix J Durability test for the body section 10 Figure 1 Locations for load tests
8、 7 Figure 2 Views of carrier 8 Figure 3 Positioning of carrier on head section 9 Table 1 Test methods and requirements for the durability of the finish on wood 2 Table 2 Test methods and requirements for the durability of the paint coatings on metal 3 Publications referred to 12BS2838-1:1988 ii BSI
9、12-1999 Foreword This Part of BS2838 has been prepared under the direction of the Health Care Standards Committee. It supersedes BS2838:1972 which is withdrawn. BS 2838 was originally published in1957 following a request by the Hospitals Standards Advisory Committee. The first revision, which was co
10、mpleted in1972, introduced performance requirements to support the design criteria that had been specified earlier. In order to assess the performance of products, tests were designed so that the applied loads and forces induced stresses in the main members and joints that exceeded those to be expec
11、ted in common use. Products complying with these performance requirements have been found to be generally satisfactory but, in preparing this revision it was considered necessary to make a number of amendments both to the requirements and to the test methods. Principally these are: a) the introducti
12、on of a test for the ignitability of the upholstery; b) the introduction of chipboard as a construction material; c) the introduction of tests for paint coatings applied to metal and wood components; d) the head section is now required to be adjustable through angles up to65 from the horizontal. Req
13、uirements are also specified for the following features which are included only when requested by the purchaser: 1) an adjustable body section, capable of adjustment up to40 from the horizontal; 2) a mounting step for metal-framed couches; 3) a breathing hole in the head section of the couch. Recomm
14、endations for the information to be provided by a purchaser to a manufacturer or supplier are given inAppendix A. A product complying with this Part of BS2838 is suitable for normal usage but not necessarily when a patient is to be subjected to short wave diathermy or other high frequency electrical
15、 treatment. The purchaser should advise the supplier if the couch is likely to be used in connection with this treatment so that any necessary modifications can be included in the design (see clause1 and Appendix A). This Part of BS2838 calls for the use of substances and/or procedures that may be i
16、njurious to health if adequate precautions are not taken. The standard refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. In particular, attention is drawn to the procedure for testing the ignitability of the upholste
17、ry of the couch. This procedure should be carried out by trained personnel under adequate supervision, and precautions should be taken to safeguard the health of personnel against the risk of fire or the inhalation of smoke and toxic products of combustion. Product certification. Users of this Part
18、of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against BS5750-2. (A guide to the use of B
19、S5750-2 is given in BS5750-5.) Enquiries as to the availability of third party certification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list
20、of Association members. During the preparation of this revision it was decided that, in addition to a specification for fixed height couches, there was a need for a specification for couches of variable height. Such a specification, to be published as BS2838-2, is in preparation.BS2838-1:1988 BSI 12
21、-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document
22、comprises a front cover, an inside front cover, pages i to iv, pages1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS2838-1:1
23、988 BSI 12-1999 1 1 Scope This Part of BS2838 specifies requirements for materials and for the basic design and performance of examination and general treatment couches of fixed height and of metal and/or wood construction. It is applicable to couches with an adjustable head section that are suitabl
24、e for use in hospitals, clinics, consulting rooms, sick bays and for massage and similar physiotherapy treatment but are not necessarily suitable for use with high frequency electrical equipment (see note1). Recommendations for information to be supplied by the purchaser to the manufacturer or suppl
25、ier are given inAppendix A. Relevant methods of test are given inAppendix B toAppendix J. NOTE 1If it is known that a couch is likely to be used whilst carrying out treatment with high frequency electrical equipment, the purchaser should advise the supplier of the need for couches that have been des
26、igned to allow this use (seeAppendix A). NOTE 2The titles of the publications referred to in this standard are listed on page 12. 2 Definitions For the purposes of this Part of BS2838 the following definitions apply. NOTEDefinitions of paint and related terms are given in BS2015. 2.1 head section th
27、e shorter section of the upholstered couch top which is hinged so that it may be raised and adjusted from the horizontal 2.2 body section the larger section of the upholstered couch top which is usually fixed in the horizontal position but which may be adjustable from the horizontal 3 Design 3.1 Dim
28、ensions The overall dimensions of the couch shall be within the following limits: The dimensions of the head section shall be within the following limits: NOTE 1The width of the head section should equal the width of the couch. NOTE 2The purchaser should state whether the couch is to have any partic
29、ular dimensions within the specified ranges (seeAppendix A). 3.2 Materials 3.2.1 Timber. The timber shall be free from visible knots, sapwood, shakes and worm-holes with the exception that tight knots are permitted if the diameter does not exceed12mm or one-third of the width of the timber in which
30、they occur, whichever is the smaller. All timber, except tie rails, shall be of seasoned hardwood of density not lower than650kg/m 3 . This timber shall have a moisture content of not greater than12% (m/m) at the time of assembly of the frame, as determined by a calibrated moisture meter. NOTEProvid
31、ed that the moisture content of the timber is not greater than12% (m/m) at the time of assembly and the timber is protected as specified in3.4.1, there will be no significant change in the moisture content during use. 3.2.2 Plywood. The plywood shall be of hardwood, such as birch or beech, complying
32、 with either gradeIII or grade BB of BS6566-6. At the time of assembly the moisture content of the plywood shall be12 2% (m/m), as determined by a calibrated moisture meter. 3.2.3 Chipboard. All wood chipboard shall comply with type I chipboard specified in BS5669. 3.2.4 Tubular steel. Tubular steel
33、 shall be solid drawn or electric resistance welded tube complying with BS6323-5 or BS6323-6. 3.2.5 Mild steel. Mild steel shall comply with grades1, 3 or 37/23 specified in BS1449-1. 3.2.6 Stainless steel. Stainless steel shall comply with grades304S15,304S16 or304S31 specified in BS1449-2. 3.2.7 U
34、pholstery covering. All covering material shall be PVC coated knitted fabric complying with grade X of BS5790-1 and, in order to reduce slipping, the coated surface of the covering material shall be embossed. (See also4.8.) NOTEThe purchaser should state the pattern and/or colour of the upholstery c
35、overing (seeAppendix A). 3.2.8 Upholstery filling. The thickness of the upholstery filling shall be not less than50mm. The filling shall consist of either: a) latex foam rubber complying with BS3129 and with a minimum indentation hardness index of265N; or b) flexible polyether foam of minimum densit
36、y50kg/m 3and with a minimum indentation hardness index of135 N; or a) length: 1 830 mm to 1 980 mm; b) width: 610 mm to 840 mm; c) height: 460 mm to 840 mm. (1) length: 610 mm to 760 mm; (2) width: 610 mm to 840 mm.BS2838-1:1988 2 BSI 12-1999 c) bonded chipfoam of minimum density64kg/m 3and with a m
37、inimum indentation hardness index of245 N. For the purposes of this Part of BS2838 the indentation hardness index shall be determined at a thickness of50 2mm using procedure A described in BS4443-2. NOTEThe purchaser should state which type of filling is required (seeAppendix A). 3.3 Joints 3.3.1 Ad
38、hesives. The adhesives used for timber joints shall comply with BS745, BS1204 or BS4071. The adhesives used for plywood joints shall comply with BS1203. NOTEAttention is drawn to DD74 which is relevant to the use of adhesives. 3.3.2 Welding. All couches constructed from tubular steel, mild steel, st
39、ainless steel or any combination of these materials shall be properly and securely welded to comply with BS3019-2 or BS5135, as appropriate to the metal. After welding, all joints shall be dressed smooth. NOTEAttention is drawn to BS4870-1, BS4871-1 and BS4872-1 for assessment of welding procedures.
40、 3.4 Finish 3.4.1 Wood. The surface of the wood shall be planed true and sanded smooth. Any staining shall be applied by a spirit stain before finishing. The finish shall be either a pre-catalysed lacquer synthetic finish, consisting of at least one base coat rubbed down before applying a second coa
41、t, or a cellulose lacquer applied in accordance with the instructions of the manufacturer of the lacquer. The finish shall comply with the requirements given inTable 1 when tested by the appropriate methods of test. The preparation of the test panels used in the tests shall be carried out in the sam
42、e manner and under the same conditions as the finish applied to the wood of the couch. NOTEThe purchaser should state whether staining is to be applied and the type of finish required (seeAppendix A). 3.4.2 Metal 3.4.2.1 Stainless steel shall either be bright polished or have a satin finish. If brig
43、ht polished, the steel shall comply with finish no.8 of Table 1 of BS1449-2:1983. Table 1 Test methods and requirements for the durability of the finish on wood Property Test method Test panel Number of test panels Requirement Resistance to impact BS 3962-6 Impact test Wooden, of same wood as the co
44、uch frame and not less than 10 mm thick 3 The rating shall be not less than 3 of BS 3962-6 Resistance to cross-cuts BS 3962-6 Cross-cut test Wooden, of same wood as the couch frame and not less than 10 mm thick 3 The rating shall be not less than 4 of BS 3962-6 Resistance to scrape BS 3962-6 Scrape
45、test with single cutting tool, mechanically operated, determining the forces to penetrate the coating surface and to penetrate to the substrate Wooden, not less than 10 mm thick 3 For surface penetration, the rating shall be not less than 3 of BS 3962-6 For penetration to the substrate, the rating s
46、hall be not less than 3 of BS 3962-6 Resistance to liquids BS 3962-4 Exposure time 60 min, using test liquids: a) ethanol (94% (V/V) industrial methylated spirits in water); b) acetone; c) glacial acetic acid, 50% (V/V) in water. Wooden, of same wood as the couch frame 3 The rating shall be not less
47、 than 4 of BS 3962-4BS2838-1:1988 BSI 12-1999 3 3.4.2.2 Prior to painting or coating mild steel, all rust, grease, scale or other adhering matter shall be removed. Mild steel shall be either: a) chromium plated in accordance with service condition number2 of BS1224; or b) pre-treated with a rust-inh
48、ibiting material (e.g.a zinc phosphate priming paint) and then coated with a stoving enamel paint or an acrylic or epoxy resin-based enamel paint; or c) pre-treated with a rust-inhibiting material (e.g.a zinc phosphate priming paint) and then coated with a powder coating material (e.g.nylon or epoxy
49、 resin-based) to a minimum thickness of504m. The paint coating detailed inb) andc) shall comply with the requirements given inTable 2 when tested by the appropriate methods of test. The preparation of the test panels used in the tests shall be carried out in the same manner and under the same conditions as the coating applied to the mild steel of the couch. NOTEThe purchaser should state the type of finish required (seeAppendix A). 3.5 Construction 3.5.1 General. The couch shall consist of a main frame and an upholstered top. 3.5.2 Main frame. The main frame
