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1、BRITISH STANDARD BS 4986:1990 Specification for Fixed height walking frames UDC 616 089.226 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 This British Standard, having been prepared under the direction of the Health Care Stand
2、ards Policy Committee was published under the authority of the Board of BSI and comes into effect on 30 November 1990 BSI 12-1999 First published November 1973 Second edition November 1990 The following BSI references relate to the work on this standard: Committee reference HCC/38 Draft for comment
3、89/53821 DC ISBN 0 580 18419 6 Committees 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/38, upon which the following bodies were represented: Association of National Health
4、 Service Supplies Officers British Investment Casting Trade Association British Medical Association British Surgical Trades Association Chartered Society of Physiotherapy College of Occupational Therapists Consumer Policy Committee of BSI Department of Health Disabled Living Foundation Disablement S
5、ervices Authority Royal Association for Disability and Rehabilitation Royal College of Nursing and National Council for Nurses of the United Kingdom Coopted members Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+0
6、0:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 BSI 12-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definition1 3Construction1 4Dimensions1 5Handles1 6Bolted and screwed connections3 7Foot rubbers3 8Mass3 9Finish3 10Performance requirements3 11Marking4 Appendix
7、 A Methods of test5 Figure 1 Fixed height frame2 Table 1 Dimensions1 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 ii BSI 12-1999 Foreword This British Standard has been prepared under
8、 the direction of the Health Care Standards Policy Committee and supersedes BS 4986:1973, which is withdrawn. BS 4986 was first published in 1973 and gave requirements for three sizes of fixed height walking frame. It was amended in 1985 by the publication of AMD 4708 which introduced a fourth, extr
9、a large, size of frame and made also, together with the second amendment, AMD 5380 in 1987, a number of minor changes. This edition of BS 4986 incorporates the published amendments and introduces technical changes to bring the standard up-to-date but it does not reflect a full review of the standard
10、, which will be undertaken in due course. This edition introduces a wider range of surface finishes for aluminium walking frames and components, and a requirement that the walking frame be marked with the batch number. Attention is drawn to the Manufacturers Registration Scheme administered by the D
11、epartment of Health. Product certification. Users 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
12、systems against the appropriate Part of BS 5750. 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 b
13、ody from the list of Association members. 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.
14、 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, 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 insi
15、de front cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 BSI 12-19991 1 Scope This British Standard specifies general requirements and performance tests for fixed height walking frames without wheels or castors. Four size
16、s are specified namely, extra large, large, medium and small. The heights of the frames, excluding foot rubbers, are 915 mm, 840 mm, 760 mm and 685 mm respectively. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definition For the purposes of t
17、his British Standard, the following definition applies. handle that part of the frame which is normally held in the hand when the frame is in use 3 Construction 3.1 General 3.1.1 Frames shall conform generally to the design illustrated in Figure 1. 3.1.2 The frame shall consist of a rigid tubular st
18、ructure having welded, bolted or brazed connections. 3.1.3 The design of the frame shall be such that the space between the front left and right legs of the frame is unimpeded, and any horizontal cross brace (see Figure 1) shall be as given in Table 1 (see dimension D). NOTEThe design of the frames
19、should be such that they may be stacked horizontally within each other without distortion. 3.2 Welding or brazing Where welding or brazing is used in the fabrication it shall be carried out in accordance with BS 1723, BS 1724, BS 3019 or BS 5135, as appropriate. 4 Dimensions Dimensions of the frames
20、 shall be as given in Table 1. 5 Handles 5.1 Two handle shafts shall be provided with handles at the top of the frame, or the handles shall be mounted directly on the side top members. Table 1 Dimensions Feature Reference in Figure 1 Size Extra largeLargeMediumSmall mmmmmmmm Height from base (exclud
21、ing foot rubbers) to major axis of handle, at the midway point of the handleA915840760685 Maximum width at base (excluding foot rubbers)B650650650650 Maximum depth at base (excluding foot rubbers)C530530530530 Height from base (excluding foot rubbers) to underside of any brace memberD150 to 165150 t
22、o 165150 to 165150 to 165 Minimum length of handleE100100100100 Minimum diameter of handle, if cylindricalF30303030 kgkgkgkg Maximum mass (including foot rubbers)2.92.72.52.3 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 2 BSI
23、 12-1999 Figure 1 Fixed height frame Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 BSI 12-19993 5.2 If separate handle shafts are provided they shall be firmly secured to, or integral with, the main structural members. 5.3 Han
24、dles shall have the length and, if cylindrical, the diameter given in Table 1 (see dimensions E and F). NOTE 1Handles may be of integral construction or may consist of a shaft fitted with a separate handgrip. NOTE 2Handles may be cylindrical or contoured. 6 Bolted and screwed connections 6.1 Where c
25、onnections are made between tubular members, shaped spacers of metal or durable non-brittle plastics materials shall be used to ensure distribution of load and to prevent distortion of the tubular members. NOTEWhere the end of a tubular member butts against the curved surface of a second tubular mem
26、ber, the former may be suitably contoured to avoid the use of a shaped spacer. 6.2 All threaded fastenings shall have a positive means of locking. 6.3 Threaded connections shall be such that there is no possibility of damage to clothing or discomfort to the user. 6.4 There shall be at least full thr
27、ead engagement on all screwed fastenings. 6.5 Self-tapping screws shall not be used. 7 Foot rubbers 7.1 The foot rubbers shall be pliable, and shall have a hardness between 45 IRHD and 60 IRHD when tested in accordance with the method described in BS 903-A26. 7.2 The foot rubbers shall be an interfe
28、rence fit (tight push) on the legs. 7.3 The foot rubbers shall be moulded with a suitable tread not less than 2 mm deep and shall afford adequate grip. 7.4 The foot rubbers shall have a tread diameter of at least 10 mm greater than the internal diameter of the foot rubber. 7.5 An insert shall be inc
29、orporated into each foot rubber to prevent the leg end piercing the foot rubber. The thickness of rubber, excluding the tread, below this insert shall be not less than 6 mm. 8 Mass The total mass of the frame, including the foot rubbers, shall not exceed that shown in Table 1. 9 Finish 9.1 General A
30、ll parts of the frame shall be free from sharp edges or projections that could cause damage to clothing or discomfort to the user. 9.2 Frame 9.2.1 Stainless steel. Stainless steel shall be of bright-drawn, matt or polished finish. 9.2.2 Mild steel. Mild steel shall be one of the following: a) chromi
31、um plated in accordance with service condition no. 2 of BS 1224; or b) stove enamelled in accordance with the process recommended by the manufacturer of the enamel; or c) plastics coated to a standard of durability at least equal to the finishes specified in a) or b). 9.2.3 Aluminium alloy. Aluminiu
32、m alloy shall have a surface coating. NOTEThe purpose of the coating is to prevent discoloration of the skin and clothes of the user that might otherwise occur owing to the transfer of aluminium compounds from the component. If the coating is an anodic oxidation coating, it shall be of thickness gra
33、de AA3 or greater, specified in accordance with BS 1615. 9.3 Fittings 9.3.1 All mild steel components shall be protectively plated to classification no. Zn3 or Cd3 of BS 1706 or to BS 1224 service condition no. 2. 9.3.2 Aluminium alloy components shall have a surface coating. NOTEThe purpose of the
34、coating is to prevent discoloration of the skin and clothes of the user that might otherwise occur owing to the transfer of aluminium compounds from the component. If the coating is an anodic oxidation coating, it shall be of thickness grade AA3 or greater, specified in accordance with BS 1615. 10 P
35、erformance requirements 10.1 Temperature/humidity cycling When tested by the method described in A.3 the frame shall not show evidence of serious deterioration. Particular attention shall be paid to any hygroscopic materials. 10.2 Stability When tested by the method described in A.4 the angle at whi
36、ch the frame becomes unstable shall be: a) not less than 25 with the line joining the base of the rear legs of the frame parallel to the axis of inclination; b) not less than 30 with this line perpendicular to the axis of inclination. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 G
37、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 4 BSI 12-1999 10.3 Static loading When the frame is tested by the method described in A.5 the maximum deflection of any part when under load shall not exceed 12 mm. Any permanent set remaining in any part of the frame after the load is removed s
38、hall not exceed 6 mm. When tested by the method described in A.7 none of the legs shall break, crack or show permanent deformation exceeding 15 mm when measured at the end of the leg. 10.4 Cyclic loading When tested by the method described in A.6 the frame shall not have suffered damage which would
39、render it unsafe to use. Wear on the handles and foot rubbers shall not be considered as damage for the purposes of this test. 11 Marking Frames complying with this British Standard shall be clearly and indelibly marked with the following: a) the size, i.e. XL for extra large, L for large, M for med
40、ium or S for small; b) the year of manufacture; c) the batch number; d) manufacturers name or other means of identification; e) the number of this British Standard, i.e. BS 4986 1). Direct punch marking on the frame shall not be used. 1) Marking BS 4986 on or in relation to a product represents a ma
41、nufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party
42、certification of conformity, which may also be desirable. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 30 08:12:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4986:1990 BSI 12-19995 Appendix A Methods of test A.1 General conditions of testing A.1.1 The accuracy of dimensional measurements s
43、hall be 2 mm. A.1.2 The accuracy of load measurements shall be 1 %. A.1.3 All tests except A.7 shall be carried out with the foot rubbers fitted. A.1.4 The rate of application of the load or loads shall be such that there is no significant risk of shock. A.1.5 All tests except A.3 shall be carried o
44、ut at an ambient temperature between 18 C and 24 C. A.2 Inspection before testing A.2.1 Immediately before testing, inspect each frame to check compliance with this standard and note any apparent defects so that they are not later recorded as having been caused by the tests. A.2.2 Record the mass of
45、 the frame, including the foot rubbers (see clause 8). A.3 Temperature/humidity cycling test A.3.1 Subject the frame to 28 days continuous storage under the following temperature/humidity cycling conditions: a) a 12 h period at a temperature of 35 C and relative humidity of not less than 95 %; b) a
46、3 h period during which the temperature is gradually lowered to 20 C; c) a 6 h period during which the temperature is maintained at 20 C. A.3.2 At the end of the 28 days continuous storage, subject the frame to storage for a period of 24 h at a temperature of 40 C and a relative humidity of not more
47、 than 30 %. A.4 Stability tests A.4.1 Place the frame upright on an inclinable plane and increase the angle of inclination to the horizontal until the point of instability of the frame is reached. Note the angle at which the frame becomes unstable. A.4.2 First carry out the test with the line joinin
48、g the base of the rear legs of the frame parallel to the axis of inclination and at the higher end of the plane. A.4.3 Repeat the test with each pair of legs in this position. A.5 Static loading test A.5.1 Place the frame upright on a flat surface and apply a vertical force of 1 560 N to the centre
49、of the handles. Arrange the force so that it is shared equally by the handles. Measure the maximum deflection of any part of the frame due to this loading. A.5.2 Measure the permanent set remaining in any part of the frame after the force is removed. A.6 Cyclic loading test A.6.1 Place the frame upright on a horizontal flat surface. A.6.2 Apply a force of 220 N vertically, at one and the same time, to each of the handles. Apply and remove these forces 500 000 times at a frequency of between 20 cycles/min and 40 cycles/min. A.7 Static test for strength
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