1、BRITISH STANDARD BS 2838-2: 1991 Examination and general treatment couches Part 2: Specification for variable height couchesBS2838-2:1991 This British Standard, having been prepared under the directionof the Health Care Standards Policy Committee, waspublished under the authorityof the Standards Boa
2、rdand comes into effect on 30April1991 BSI 12-1999 First published as BS2838 March1957 Second edition March1972 Third edition as BS2838-2 April1991 The following BSI references relate to the work on this standard: Committee reference HCC/31 Draft for comment 89/50659 DC ISBN 0 580 19315 2 Committees
3、 responsible for this British Standard The preparation of this British Standard was entrusted by the Health Care Standards Policy Committee (HCC/-) to Technical Committee HCC/31, upon which the following bodies were represented: Associated Offices Technical Committee Association of British Paediatri
4、c Nurses British Paediatric Association British Surgical Trades Association Chartered Society of Physiotherapy Consumer Policy Committee of BSI Crown Suppliers Department of Health Department of the Environment (Property Services Agency) Furniture Industry Research Association Health Service Supply
5、Council Independent Engineering Insurers Committee Joint Committee of Professional Nursing, Midwifery and Health Visiting Associations (England) King Edwards Hospital Fund for London Royal College of Nursing Amendments issued since publication Amd. No. Date CommentsBS2838-2:1991 BSI 12-1999 i Conten
6、ts Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Design 1 4 Performance and safety 5 5 Test report 7 6 Marking 7 Appendix A Recommendations for the information to be provided by a purchaser 8 Appendix B Static load test 8 Appendix C Impact energy test 8 Appen
7、dix D Cyclic loading test 9 Appendix E Static load test for the head section 9 Appendix F Durability test for the head section 10 Appendix G Durability test for the frame 10 Appendix H Determination of the reliability of tilt-adjustment mechanism 11 Appendix J Determination of structural strength an
8、d performance of height-adjustment mechanism 11 Appendix K Determination of reliability of height-adjustment mechanism 11 Appendix L Static load test for adjustable body section 11 Appendix M Durability test for adjustable body section 12 Figure 1 Locations for load tests 8 Figure 2 Views of carrier
9、 9 Figure 3 Positioning of carrier on head section 10 Table 1 Test methods and requirements for the durability of the finish on wood 3 Table 2 Test methods and requirements for the durability of the coatings 4 Publication(s) referred to 14BS2838-2:1991 ii BSI 12-1999 Foreword This Part of BS2838 has
10、 been prepared under the direction of the Health Care Standards Policy Committee. BS2838 was originally published in1957 following a request by the Hospitals Standards Advisory Committee and it was first revised in1972. During the preparation of the1972 edition, it was decided that, in addition to a
11、 specification for fixed height couches, there was a need for a specification for couches of variable height to be published as BS2838-2. This Part of BS2838 specifies most of the requirements for variable height couches. However, Appendix A allows individual purchasers to specify their own requirem
12、ents, the product then being subject to the performance tests given in Appendix B to Appendix M andTable 1 to ensure compliance with this Part of BS2838. This Part of BS2838 calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. The s
13、tandard 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 upholstery of the couch (see4.11). This procedure should be carried out
14、 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. This Part of BS2838 requires the purchaser to be advised by the supplier seeclause6 c) that the
15、 couch is not suitable for use with equipment for diathermy treatment or for high frequency electrical treatment. Product certification. Users of this Part of BS2838 are advised to consider the desirability of third party certification of product conformity with this British Standard based on testin
16、g and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification schemes will be fowarded by BSI to the Association of Certification Bodies. If a third party certif
17、ication scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. Alternatively, users of this British Standard may wish to consider the desirability of assessment and registration of a suppliers quality systems against the appropriate
18、 Part of BS5750 by a third party certification body. 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 o
19、bligations. Summary of pages This document comprises a front cover, an inside front cover, pagesiandii, pages1to14, 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 th
20、e inside front cover.BS2838-2:1991 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 variable height and of metal and/or wood construction. It is applicable to couches fitted with an
21、 adjustable head section that are suitable for use in hospitals, clinics, consulting rooms, sick bays and for massage and similar physiotherapy treatment. This Part of BS2838 is not applicable to couches for use with short-wave diathermy and high-frequency electrical equipment. This Part of BS2838 i
22、s not applicable to electrically operated examination and treatment couches. It is also not applicable to couches for use in conditions of high humidity and high temperature such as Turkish baths and swimming pools. Recommendations for information to be provided by the purchaser to the manufacturer
23、or supplier are given in Appendix A. Relevant methods of test are given in Appendix B to Appendix M. NOTEThe titles of the publications referred to in this standard are listed on page 14. 2 Definitions For the purposes of this Part of BS2838 the following definitions apply. NOTEDefinitions of paint
24、and related terms are given in BS2015. 2.1 head section the 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 but which may be adjustable 2.3
25、 one-way tilt the adjustment of the whole of the top section of the couch to provide Trendelenberg position 3 Design 3.1 Dimensions The overall dimensions of the couch shall be within the following limits: The height of the top of the couch shall be adjustable between458 25mm to863 25mm. The dimensi
26、ons of the head section shall be within the following limits: NOTEThe purchaser should state whether the couch is to have any particular dimensions within the specified ranges (seeAppendix A). 3.2 Materials 3.2.1 General The materials of construction shall be selected from those described in3.2.2 to
27、3.2.9. 3.2.2 Timber Timber shall be free from visible knots, sapwood, shakes and worm-holes with the exception that tight knots are permitted if their diameter does not exceed12mm or one-third of the width of the timber in which they occur, whichever is the smaller. All timber, except tie rails, sha
28、ll 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. NOTEProvided that the moisture content of the timber is not greater than12% (m/m)
29、 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. 3.2.3 Plywood Plywood shall be of hardwood, such as birch or beech, complying with either grade III or grade BB of BS6566-6. At the time of assembly, the
30、 moisture content of the plywood shall be12 2% (m/m), as determined by a calibrated moisture meter. 3.2.4 Wood chipboard Wood chipboard shall comply with type I chipboard specified in BS5669-2. 3.2.5 Steel tube This shall consist of mild steel solid drawn tube or electric resistance welded tube comp
31、lying with BS6323-5 or BS6323-6. 3.2.6 Mild steel Mild steel shall comply with grades1, 3or37/23 specified in BS1449-1. 3.2.7 Stainless steel This shall, comply with grades304S15, 304S16, or304S31 specified in BS1449-2. a) length: 1 830 mm to 1 980 mm; b) width: 610 mm to 840 mm. 1) length: 355 mm t
32、o 900 mm; 2) width: 610 mm to 840 mm (see note).BS2838-2:1991 2 BSI 12-1999 3.2.8 Upholstery 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 lightly embossed. (
33、Seealso4.11.) NOTE 1The purchaser should state the pattern and/or colour of the upholstery covering (see Appendix A). NOTE 2The fabric should be easily cleaned and disinfected. 3.2.9 Upholstery filling The thickness of the upholstery filling shall be not less than50mm. The filling shall consist of e
34、ither: a) combustion-modified high-resilience foam (CMHR) of a minimum density of50kg/m 3and with a minimum indentation hardness index of135N; or b) combustion-modified high-resilience chipfoam of minimum density64kg/m 3and with a minimum indentation hardness index of245N. The indentation hardness i
35、ndex shall be determined at a thickness of 502mm using procedure A described in BS4443-2:1972. NOTEThe purchaser should state which type of filling is required (see Appendix A). 3.3 Joints 3.3.1 Adhesives Adhesives used for any timber joint shall comply with BS745, BS1204 or BS4071. The adhesives us
36、ed for plywood joints shall comply with BS1203. NOTEAttention is drawn to DD74 which is relevant to the use of adhesives. 3.3.2 Welding Couches constructed from tubular steel, mild steel, stainless steel or any combination of these materials shall be welded to comply with BS3019-2 or BS5135, as appr
37、opriate to the metal. NOTE 1Welded joints should be smooth. NOTE 2Attention is drawn to BS4870-1, BS4871-1 and BS4872-1 for assessment of welding procedures. 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 f
38、inishing. The finish shall be either a pre-catalysed lacquer synthetic finish, consisting of at least one base coat rubbed down before applying a second coat, or a cellulose lacquer applied in accordance with the instructions of the manufacturer of the lacquer. The properties of the finish shall com
39、ply with the requirements given in Table 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 same manner and under the same conditions as the finish applied to the wood of the couch. NOTEThe purchaser should state whether
40、 staining is to be applied and the type of finish required (see Appendix A). 3.4.2 Stainless steel The finish of stainless steel shall either be bright polished or satin finished. If bright polished, the finish shall comply with finish No. 8 of Table1of BS1449-2:1983. 3.4.3 Mild steel 3.4.3.1 Prepar
41、ation All rust, grease, scale or other adhering matter shall be removed from mild steel. 3.4.3.2 Finish Mild steel shall be finished in one of the following ways: a) chromium plated in accordance with service condition number2of BS1224; b) pre-treated with a rust-inhibiting material (e.g. a zinc pho
42、sphate priming paint) and then coated with a stoving enamel paint or an acrylic or epoxy resin-based enamel paint; 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 resin-based) to a minimum thickne
43、ss of50m. The paint coatings detailed in b) and c) shall comply with the requirements given inTable 2 when tested by the appropriate methods. The coating of the test panels shall be applied in the same manner and under the same conditions as the coating applied to the mild steel of the couch. NOTETh
44、e purchaser should state the type of finish required (see Appendix A). 3.5 Construction 3.5.1 General The couch shall consist of a metal chassis fitted with castors complying with BS2099. The castors shall be not less than64mm diameter. The chassis shall be surmounted with a support frame and an uph
45、olstered top. Either all the castors, or the diagonally opposed castors, shall be capable of being immobilized either by braking or by retraction of the castors. NOTE 1When the castors have been immobilized, the couch should be stable.BS2838-2:1991 BSI 12-1999 3 NOTE 2The purchaser should state whet
46、her facilities for attaching accessories, such as lithotomy poles, drip poles and roll holders for paper towels, are to be fitted to the couch (seeAppendix A). Requirements for these facilities are not specified in this Part of BS2838. 3.5.2 Support frame The support frame shall be rigidly construct
47、ed from one or more of the materials described in3.2.2 to3.2.7. The support frame shall be secured to the chassis so that it can not be detached except by the use of tools. 3.5.3 Upholstered top The top of the couch shall comprise a body section and head section. The top shall be securely attached t
48、o the support frame in such a manner that the top can not be detached except by the use of tools. The couch top shall be upholstered with a filling complying with 3.2.9 and with a covering complying with3.2.8 to give flat, unwrinkled, unbroken surfaces and fold-free top surfaces and sides. 3.5.4 Hea
49、d section The head section shall be hinged and shall be adjustable using one hand, from either side through angles from0 up to at least65 to the horizontal. NOTE 1The head section may be adjustable either to any angle within the specified range or to a limited set of positions only. The mechanism for locking the head section in position shall ensure that the head section can not fall if it is knocked in any direction. NOTE 2The method of adjustment should be such as to prevent the risk of injury to the operators fingers when adjusting the head section, whet
