1、BRITISH STANDARD BS 2483:1977 Incorporating Amendment No. 1 Specification for Overbed tables UDC 615.478.24:615.435 CONFIRMED DECEMBER 2007BS2483:1977 This British Standard, having been prepared under the directionof the Surgical Instruments and Medical Equipment Standards Committee,was published un
2、derthe authority of the Executive Board on 29July1977 BSI 09-1999 First published June 1954 First revision July 1977 The following BSI references relate to the work on this standard: Committee reference SGC/33 Draft for comment 76/62923 DC ISBN 0 580 09545 2 Cooperating organizations The Surgical In
3、struments and Medical Equipment Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Anaesthetists of Great Britain and Ireland* Association of
4、British Sterilizer Manufacturers British Dental Association British Institute of Surgical Technicians British Medical Association British Paediatrics Society British Rubber Manufacturers Association* British Surgical Trades Association Incorporated* Department of Health and Social Security* Disposab
5、le Hypodermic and Allied Equipment Manufacturers Association Medical and Dental Defence Union of Scotland Medical Defence Union Medical Protection Society Medical Sterile Products Association Ministry of Agriculture, Fisheries and Food Ministry of Defence Queens Institute of District Nursing Royal C
6、ollege of Midwives* Royal College of Obstetricians and Gynaecologists Royal College of Surgeons of Edinburgh Royal College of Veterinary Surgeons Royal Institute of Public Health and Hygiene Scientific Instrument Manufacturers Association The organizations marked with an asterisk in the above list,
7、together with the following, were directly represented on the committee entrusted with the preparation of this British Standard. Department of the Environment (PSA) King Edwards Hospital Fund for London Royal College of Nursing and National Council for Nurses of the UK Royal College of Physicians of
8、 London Amendments issued since publication Amd. No. Date of issue Comments 4273 November 1983 Indicated by a sideline in the marginBS2483:1977 BSI 09-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii Section 1. General 1 Scope 1 2 References 1 Section 2. Cantilever type
9、overbed tables 3 Dimensions 1 4 Materials 1 5 Construction 1 6 Finish 2 7 Marking 2 8 Test requirements 3 9 Methods of test 3 Section 3. Bridge type overbed tables 10 Dimensions 4 11 Materials 4 12 Construction 4 13 Finish 5 14 Marking 5 15 Test requirements 5 Appendix A Requirements and test method
10、s for stoving paint and plasticscoating finishes 6 Publications referred to Inside back coverBS2483:1977 ii BSI 09-1999 Foreword This British Standard, prepared under the direction of the Surgical Instrument and Medical Equipment Standards Committee, was first published in1954 and specified requirem
11、ents for overbed tables of fixed height intended for use with beds complying with the requirements of BS1682. At that time tables mounted on a single cantilever support were considered to be for special applications outside the scope of BS2483. The cantilever type of table has become more popular fo
12、r use over beds and chairs and in this first revision cantilever types of tables are included. The title of this standard has been modified to accommodate its wider scope. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respon
13、sible 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 andii, pages1 to6, an inside back cover and a back cover. This standard has been up
14、dated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS2483:1977 BSI 09-1999 1 Section 1. General 1 Scope This British Standard specifies the basic requirements and performance tests for overbed tables of the can
15、tilever and bridge types, the former capable of adjustment in height and the latter of fixed height. Section2 covers overbed tables of the cantilever type and section3 covers overbed tables of the bridge type. Adjustable height tables may be used as overchair tables. Tables with tilting tops are not
16、 included in the scope of this standard. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. Section 2. Cantilever type overbed tables 3 Dimensions The dimensions of cantilever type overbed tables shall be as specified in3.1 to3.6. 3.1 Vertic
17、al height and adjustments. The vertical height measured from the floor to the working surface of the top shall be adjustable between700mm minimum to1100mm maximum. 3.2 Thickness of top structure. The overall thickness of the top and its supporting structure shall not exceed70mm, excluding upstands,
18、for a minimum length of550mm from the unsupported end of the top. 3.3 Size of top 3.3.2 To ensure stability every part of the top shall lie on or within the minimum plan area formed by the contact points of the castors and/or feet with the floor. 3.4 Base 3.4.1 The height of the base shall not excee
19、d100mm to ensure passage under beds conforming to the requirements of BS4886-1 and BS4886-2. 3.4.2 The overall dimensions of the base, excluding the castors, shall not exceed the overall dimensions of the top by more than35mm at any point. 3.5 Castors or feet. The table may be fitted with either cas
20、tors or feet or a combination of both. Ifcastors are fitted the minimum wheel diameter shall be35mm. 3.6 Height adjustment control. The height adjustment control or handle shall not protrude above the surface of the table top and shall not project more than65mm outside the periphery of the table top
21、. 4 Materials 4.1 Materials shall be non-toxic. 4.2 Where ferrous or non-ferrous metals are used they shall conform to the relevant British Standard specification. 4.3 Blockboard and laminboard shall conform to the requirements for grade2-2 interior bonded3-ply construction of BS3444. 4.4 Chipboard
22、shall conform to the higher quality chipboard recommended in Table 6 of BS5669:1979. 4.5 Plywood shall conform to grade2-2 or birch BB of BS1455. 4.6 Laminated plastics sheet for the working surface of the top shall conform to class1, FR grade of BS3794. The underside balancing plastics laminate sha
23、ll be a minimum of0.8mm in thickness. 4.7 Castor tread or feet shall be of a composition that does not permanently stain the floor. 5 Construction 5.1 General 5.1.1 The table shall be constructed to conform to the performance test requirements specified in clause8. 5.1.2 Sharp projections and edges
24、shall be avoided and the table shall be designed to prevent injury such as finger and limb trapping. 5.1.3 Welding shall be in accordance with the appropriate British Standard for the type of material used. For steel, BS693 and BS5135 are appropriate. For stainless steel, BS3019-2 is appropriate. Fo
25、r aluminium alloys, BS3019-1 is appropriate. Exposed welds shall be dressed without significant weakening of the strength of the joint. 5.1.4 There shall be no crevices which may harbour dirt or foreign matter. 5.2 Table top 5.2.1 The four corners of the table top shall have a minimum radius of25mm.
26、 3.3.1 Length (from side to side) 800mm minimum 900mm maximum Width (from front to back) 350mm minimum 450mm maximumBS2483:1977 2 BSI 09-1999 5.2.2 All table tops shall be flat and may additionally have either of the following upstand arrangements. a) A continuous upstand (or preformed edge) on the
27、back and two sides with radiused corners. b) Upstands on the back and two sides with clear gaps of not less than40mm at the corners to facilitate cleaning. All upstands should have a minimum height of5mm and radiused edges and ends. If constructed by the method specified in a) or b) the height adjus
28、tment mechanism shall be on the patients right-hand side. 5.2.3 The working surface shall be covered with laminated plastics sheet conforming to the requirements specified in4.6. Alternatively, where the working surface is not so covered, it shall be capable of meeting the functional requirements fo
29、r laminated plastics sheet conforming to the requirements for class1 of BS3794. 5.2.4 Any laminated plastics sheet or similar material shall be adequately bonded to the top and underside of the substrate which shall remain free from twist and warp. 5.2.5 All upstands, lippings, surfaces and edges sh
30、all be treated in accordance with the appropriate finish specified in clause6 and where applicable shall conform to the requirements of5.4. 5.3 Height adjustment control 5.3.1 The height adjustment shall be easy to operate and shall not jam during operation. The shape and size of any handle or knob
31、etc, shall be suitable for users having a weak grip. 5.3.2 If a mechanism incorporating a thread is used, the thread shall be of a suitable form and not more than90 revolutions of the handle shall be necessary to raise the table top from the minimum to the maximum height. 5.3.3 The height adjustment
32、 mechanism shall be self-lubricating. 5.3.4 The table top shall remain at the height selected until further adjustment is required. It shall not be possible for any use or misuse of the height adjustment control to result in a sudden or uncontrolled movement of the table top. 5.4 Surface spread of f
33、lame. The composite overbed table top shall conform to the requirements for class1 of BS476-7. 6 Finish 6.1 Steel 6.1.1 Steel shall be finished with stoving paint, plastics coating or chromium plating. 6.1.2 The finish shall be applied strictly in accordance with the manufacturers instructions. The
34、finish shall present a smooth surface free from any defects and, where of stoving paint or plastics coating, it shall be non-toxic and conform to the requirements of the tests in Appendix A of this standard. 6.1.3 Where chromium plated, it shall conform to service condition no.3 of BS1224. 6.2 Stain
35、less steel. The finish of stainless steel shall conform to the requirements of Table1, finishno.4 of BS1449-2:1975. 6.3 Aluminium alloys. Aluminium alloys shall be anodized in accordance with the requirements for grade AA5 of BS1615. 6.4 Wood 6.4.1 Wood finish shall conform to the requirements of BS
36、3962-2, BS3962-3, BS3962-4, BS3962-5 and BS3962-6. 6.4.1.1 Resistance to wet heat (Part2) shall have a rating of5 at70 C. 6.4.1.2 Resistance to dry heat (Part3) shall have a rating of5 at140 C. 6.4.1.3 Resistance to cold liquids (Part4) shall have a rating of5. 6.4.1.4 Resistance to cold oils and fa
37、ts (Part5) shall have a rating of5. 6.4.1.5 Resistance to mechanical damage (Part6) shall have a rating of5 for impact, scratch resistance and cross-cut tests. 7 Marking Overbed tables conforming to the requirements of this standard shall be marked on the underside of the top with the following info
38、rmation. a) The number of this British Standard i.e.BS2483. b) Manufacturers name and trade mark. c) The month and year of manufacture.BS2483:1977 BSI 09-1999 3 8 Test requirements 8.1 Requirements for structural strength and structural stability. When tested by the method described in9.5 the table
39、shall not suffer permanent distortion or become unsafe for use. 8.2 Requirements for strength and stability under conditions of static loading 8.2.1 When tested by the method described in9.6.1 the deflection of the top of the overbed table at any point shall not exceed10mm after15min under load. Aft
40、er removal of the load the overbed table shall show no permanent deformation when measurements are taken at the same points as those taken when under load. 8.2.2 When tested by the method described in9.6.2 the maximum deflection of the top after the load has been in position for15min shall be10mm at
41、 either of the corners furthermost from the support column and there shall be no permanent set on removal of the load. 8.3 Requirements for reliability under a dynamic load. At the completion of the test described in9.7 the table shall not have suffered damage which would render it unsafe in use. 8.
42、4 Requirements for reliability of height adjusting mechanism. At the completion of the test described in9.8 the mechanism shall not have suffered damage which would render it unsafe or unable to operate correctly. 9 Methods of test 9.1 Principle. The principle of the tests is to apply forces that pr
43、oduce, in the main members and joints, the maximum stress to which the tables are likely to be subjected when used over beds and chairs. 9.2 General conditions of test. The accuracy of linear measurement shall be 1.5mm. The accuracy of load measurement shall be1%. The rate of application of the load
44、s shall be such that there is no risk of shock to the structure. Tests shall be carried out in an ambient temperature between18 C and24 C. All tests shall be carried out with the overbed table adjusted to the maximum height. 9.3 Inspection before testing. Immediately before being tested, the overbed
45、 table shall be inspected and any apparent defects noted so that they shall not later be recorded as having been caused by the tests. 9.4 Test procedure. Overbed tables shall be subjected to the tests described in9.5 to9.8. 9.5 Tests for structural stability and structural strength. A uniformly dist
46、ributed mass of65kg shall be applied to the table top and after a period of15min the mass shall be removed and the overbed table examined (see8.1). 9.6 Tests for structural stability and structural strength under conditions of static stress 9.6.1 The height of the table top above floor level shall b
47、e measured at the corners furthermost from the support column. A uniformly distributed mass of25kg shall be applied to the top and after a period of15min measurements shall be taken at the same points and the deflection due to the stress shall be calculated (see8.2.1). The mass shall be removed and
48、after5min measurement shall again be taken at the same points. 9.6.2 A 12 kg mass distributed over an area of155mm 2shall be applied to the table top so that the centre of the load is75mm from the unsupported end and centrally across the width. Measurement shall be taken at the above mentioned point
49、s. The mass shall be removed and after5min measurements shall be taken to establish any permanent set (see8.2.2). 9.7 Test for structural stability and structural strength under conditions of dynamic stress. A mass of12kg distributed over an area of155mm 2shall be applied to the table top so that the centre of the load is75mm from the unsupported end and centrally across the width. This mass shall be applied and removed50000 times at a frequency between20 and40 cycles per minute. On completion of50000 cycles the table shall be examined (see8.3). 9.8 Test for reliabili
