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1、BRITISH STANDARD BS 7377:1994 Specification for Step stools Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 This British Standard, having been prepared under the direction of the Technical Sector B
2、oard for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 April 1994 BSI 07-1999 First published January 1991 Second edition April 1994 The following BSI references relate to the work on this standard: Committee reference B/512 Draf
3、t for comment 93/103211 DC ISBN 0 580 22730 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Technical Sector Board for Building and Civil Engineering (B/-) to Technical Committee B/512, upon which the following bodies were represented:
4、 Aluminium Federation British Hardware and Housewares Manufacturers Association British Ladder Manufacturers Association Consumer Policy Committee of BSI Consumers Association Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Association Health and Safety Executive Ins
5、titute of Trading Standards Administration National Federation of Master Steeplejacks and Lightning Conductor Engineers Refractory Contractors Association Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15
6、:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 BSI 07-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Definitions1 4Classification of duty rating1 5Materials1 6Manufacturing tolerances1 7Marking5 8Dimensions6 9Construction6 10Performance6
7、 Annex A (normative) General, apparatus and test report7 Annex B (normative) Dimensional test11 Annex C (normative) Accidental tipping test11 Annex D (normative) Stability test12 Annex E (normative) Vertical static load test13 Annex F (normative) Horizontal static load test14 Annex G (normative) Ver
8、tical fatigue test15 Annex H (normative) Horizontal fatigue test15 Annex J (normative) Vertical impact test17 Annex K (normative) Horizontal impact test17 Annex L (normative) Drop test18 Annex M (normative) Step assembly operation folding test19 Annex N (normative) Seat suitability test and determin
9、ation of height19 Annex P (normative) Handrail load test19 Annex R (informative) Recommendations for care and use of step stools20 Figure 1 Step stools with fixed or braced legs2 Figure 2 Step stools with fold-out and pull-out steps3 Figure 3 Step stool with handrail4 Figure 4 Rigid step stool5 Figu
10、re A.1 Loading pad8 Figure A.2 Suggested linkage arrangement constraining loading pad8 Figure A.3 Impactor9 Figure A.4 Impact hammer10 Figure C.1 Accidental tipping test11 Figure D.1 Stability test12 Figure E.1 Vertical static load test13 Figure F.1 Horizontal static load test15 Figure G.1 Vertical
11、fatigue test16 Figure H.1 Horizontal fatigue test16 Figure J.1 Vertical impact test17 Figure K.1 Horizontal impact test: deployed18 Figure K.2 Horizontal impact test: retracted18 Figure L.1 Drop test19 Figure P.1 Handrail test20 Table E.1 Summary of test parameters14 List of referencesInside back co
12、ver Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Technical Sector Board for Building and Civil Engineer
13、ing. This edition introduces technical changes but does not reflect a full review or revision of the standard. It replaces BS 7377:1991 which is withdrawn. The principal changes from the previous edition have been made following testing experience and involve changes to test criteria as well as clar
14、ification of certain definitions. Improved pictorial representation of different types of step stools have been added and improved tests incorporated where handrails feature. It is a performance standard for non-mobile step stools of a maximum height of 1 m. There are no tests included for the life
15、of materials as affected by corrosion or degradation by exposure to atmospheric conditions. The conditions of use are based on research carried out on existing step stools which are considered to be satisfactory. Because accidents associated with step stools may occur from misuse, the standard speci
16、fies marking which includes the recommended loading and warnings against common misuse. Annex R gives recommendations for the care and use of step stools which should be included by manufacturers in their literature. Annex A gives general information relating to the tests described in subsequent ann
17、exes which have been developed from the furniture standard BS 4875 and details the apparatus required. The UK participated in the preparation of a European standard for ladders, implemented as BS EN 131, which excludes step stools from its scope but other national standards have been considered in t
18、he preparation of this standard with a view to eventual preparation of a European standard for step stools. In particular, attention is drawn to Schedule 1, Part 1, Schedule 4, Part 1, and Schedule 5, Part 1, of the Furniture and Furnishings (Fire) (Safety) Regulations 1988. This edition of this Bri
19、tish Standard has been submitted for continued approval under the Approval of Safety Standards Regulations 1987 as a means of compliance with the general safety requirement imposed by Section 10 of the Consumer Protection Act 1987. A British Standard does not purport to include all the necessary pro
20、visions 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 comprises a front cover, an inside front cover, pages i and ii, pages 1 to 20,
21、 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. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:4
22、9 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 BSI 07-19991 1 Scope This British Standard specifies dimensional, fitness for purpose and performance requirements for portable step stools of two grades which have a maximum seat height of 1 000 mm. The standard covers step stools with padde
23、d and rigid top platforms suitable for standing on. The step stools are classified into two grades: a) grade G, for general domestic and light commercial use; b) grade H, for more severe domestic and commercial use. 2 References 2.1 Normative references This British Standard incorporates, by referen
24、ce provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only wh
25、en incorporated in it by updating or revision. 2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be
26、 made to the latest editions. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 step stool a folding or rigid set of non-mobile steps with a top platform which serves as a step and a seat. The steps may be fixed or retractable, and a back, handrail or suppo
27、rt pole may be included 3.2 mobile steps steps which are fitted with wheels or rollers to facilitate relocation 3.3 positive locking locking by a device which does not depend on friction or tension NOTEChains are not suitable. 3.4 duty rating maximum combined weight of user and load 3.5 handrail any
28、 member which extends above the seat or top platform including rails, poles or backs NOTESee dimension h in Figure 1 to Figure 4. 4 Classification of duty rating The step stools covered by this standard shall be classified by their suitability for use under a maximum loading as follows: a) grade G,
29、suitable for use under a loading of 100 kg duty rating; b) grade H, suitable for use under a loading of 120 kg duty rating. NOTEThe classification above is derived from research and the description of performance used for furniture in BS 4875. Because step stools are uniquely intended for joint use
30、as furniture and as steps neither BS 4875 or BS 2037 was considered totally applicable. 5 Materials The materials used shall be such as to enable the step stool to satisfactorily undergo the tests given in the Annex A to Annex P. NOTEThe tests do not check on the durability of materials which should
31、 be selected having regard to the stresses to which they may be subjected and their resistance to deterioration due to environmental conditions. 6 Manufacturing tolerances 6.1 Height The height of the step stool seat or platform when measured as described in Annex B shall not exceed 1 m and shall be
32、 within 10 mm of the height stated by the manufacturer. 6.2 Tread spacing The treads shall be uniformly spaced within a tolerance of 5 mm. This tolerance shall apply to the height of the first tread above the floor and the free surface of the top platform above the nearest tread. 6.3 Horizontal surf
33、aces When in use, the treads and top platform shall be horizontal to within 2. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 2 BSI 07-1999 hab1b2b3b5b6b7 Min.300b1+ 0.1h250250b5+ 0.1h806565 Max.1
34、 0002507075 NOTEAll linear dimensions are in millimetres. Figure 1 Step stool with fixed or braced legs Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 BSI 07-19993 hab1b2b4b5b6b7 Min.300b1+ 0.1h25
35、0250b5+ 0.1h8045 Max.1 0002507080 NOTEAll linear dimensions are in millimetres. Figure 2 Step stools with fold-out and pull-out steps Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 4 BSI 07-1999 h
36、ab1b2b3b5b6b7 Min.300b1+ 0.1h250250b5+ 0.1h806565 Max.1 0002507075 NOTEAll linear dimensions are in millimetres. Figure 3 Step stool with handrail Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 BS
37、I 07-19995 7 Marking NOTEAttention is drawn to the Furniture and Furnishings (Fire) (Safety) Regulations 1988. 7.1 Step stools shall be clearly and durably marked with the information specified in 7.2 and 7.3. Compliance shall be checked by inspection and by rubbing the marking lightly, first for 15
38、 s with a cloth soaked in water and then for 15 s with a cloth soaked in petroleum spirit. There shall be no reduction in legibility at the conclusion of the test. Adhesive labels where used shall not have worked loose or become curled at the edges. Tie-on labels shall not be used to provide the inf
39、ormation specified in 7.2 and 7.3. 7.2 Step stools shall be marked with the following particulars: a) the name, trade mark or other means of identification of the manufacturer or supplier; b) the number and date of this British Standard, i.e. BS 7377:19941); c) the grade and duty rating, e.g. grade
40、G 100 kg. 7.3 Step stools shall be provided with a separate firmly attached label displaying at least the following wording on a red background. a) According to the grade of step stool, either: 1) maximum loading 100 kg (15.7 stones); or 2) maximum loading 120 kg (18.8 stones). b) Inspect for damage
41、 before use. hab1b2b5b6b7 Min.300b1+ 0.1h250b5+ 0.1h80 Max.1 0002504580 NOTEAll linear dimensions are in millimetres. Figure 4 Rigid step stool 1) Marking BS 7377:1994 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacture
42、r that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable. Licensed Copy: London South Bank University, London South B
43、ank University, Fri Dec 08 15:00:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7377:1994 6 BSI 07-1999 c) Ensure that there is a firm, level base. d) Avoid over-reaching. In addition, the following wording shall be included when relevant. i) Check that locking devices have operated. ii) Do not cl
44、imb steps in the folded position. iii) Check self-assembly fittings. 8 Dimensions The dimensions of step stools shall be as shown in Figure 1 to Figure 4. The design of step stools is permitted to vary from those illustrated but the dimensional requirements shall be satisfied. 9 Construction 9.1 Sha
45、rp edges There shall be no burrs or sharp edges. All edges shall be folded or have a minimum radius of 0.7 mm. NOTEFolding mechanisms and frames should avoid finger traps. Whenever possible this should be achieved by having a clearance sufficient to admit a 15 mm diameter rod or if the clearance is
46、less than 15 mm the adjacent members should have dimensions of not less than 20 mm 20 mm. 9.2 Locking devices Step stools with folding frames or handrails shall be fitted with locking devices on both sides of the frame. The locking devices shall provide positive locking. 9.3 Treads Treads shall be u
47、niformly spaced and horizontal when in use and shall have a slip resistant surface. (See 6.2 and 6.3.) 9.4 Self-assembly Step stools for self-assembly shall be supplied with instructions for correct assembly which shall include a warning that fittings should be tightened regularly. 9.5 Handrails No
48、part of the inside facing surface of the top of any rail, pole or back shall project beyond the rear edge of the seat or platform. 9.6 Foam Foam for contract use shall be subjected to a control exercise by the Fire Officer (Public Buildings). NOTEFor domestic use, attention is drawn to Schedule 1, P
49、art 1, of the Furniture and Furnishings (Fire) (Safety) Regulations 1988 for foam, to Schedule 4, Part 1 (cigarette test), for covering fabric and filling composite and to Schedule 5, Part 1 (match test), for fabric. 9.7 Feet Feet shall be soled with a slip-resistant material. The feet shall provide a wearing surface and shall be securely held but removable for renewal. 10 Performance 10.1 When tested in accordance with Annex C the stool shall return to the upri