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1、BRITISH STANDARD BS 4951:1973 Specification for Builders hardware: lock and latch furniture (doors) UDC 691.8:681.31/.33 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4951:1973 This British Standard, having been approved by the Hardware
2、 and Ironmongery Industry Standards Committee, was published under the authority of the Executive Board on 15 October 1973 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference HIB/9 and HIB/9/7 Draft for comment 71/12131 ISBN 0 580 07747 0 Co-operating or
3、ganizations The Hardware and Ironmongery Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific, industrial and professional organizations: The Government department and scientific
4、, industrial and professional organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Builders HardwareGuild of Architectural Ironmongers* Manufacturers*In
5、stitution of Municipal Engineers* British Lock Manufacturers Association*Metal Window Federation of Great Britain* British Plastics Federation*Metropolitan Police British Steel IndustryNational Federation of Building Trades Copper Development Association*Employers* Department of the Environment*Nati
6、onal Federation of Ironmongers* Department of the Environment BuildingRoyal Institute of British Architects* Research EstablishmentRoyal Institution of Chartered Surveyors Greater London Council*Zinc Development Association Aluminium FederationIncorporated Association of Architects Association of Bu
7、rglary Insurance Surveyorsand Surveyors British Woodwork Manufacturers AssociationIncorporated British Institute of City of London PoliceCertified Carpenters Department of the Environment BuildingNational Federation of Builders and Research Establishment, PrincesPlumbers Merchants Risborough Laborat
8、oryZinc Alloy Die-Casters Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4951:1973 BSI 03-2000i Contents Page Co-operating organizationsInside front cover Fore
9、wordii 1Scope1 2Definitions1 3Selection of test samples1 4Workmanship1 5Dimensions and fixing systems1 6Materials2 7Finishes2 8Tests2 9Conditions of test2 10Marking2 Appendix A Fitting of specimens to test blocks3 Appendix B Mechanical tests3 Figure 1 Mortice lock or latch pierced or shaped to allow
10、 passage of bolts4 Figure 2 Keyhole dimensions and centres for mortice lock furniture (with recommended spindle hole dimensions)5 Figure 3 Levers and knobs5 Figure 4 Projection of levers and knobs6 Figure 5 Length and width of plates6 Figure 6 Torque test rig6 Figure 7 Tensile test rig7 Figure 8 Dur
11、ability test rig8 Figure 9 Lever attachment to knob furniture9 Publications referred to10 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4951:1973 ii BSI 03-2000 Foreword BS 1331, “Builders hardware for housing” was published in 1946 to
12、provide a range of standardized builders hardware for use in the post war housing programme. It was revised in 1954 and took into account the development of alternative materials for a number of the items specified. In due course BS 1331 will be replaced completely by a number of new British Standar
13、ds which will be expressed in metric units. This British Standard, the first of the new standards, specifies performance criteria for lever and knob furniture for use with locks and latches on doors. Because of the complexity of the subject, the material cannot be specified in detail for each piece
14、of every component. Likewise dimensions of those pieces cannot be given to suit all materials. This British Standard does not aim to specify metric design. It is expressed wholly in metric terms but these are based on British practice. Thus, the tolerances which are given enable existing practice ba
15、sed on imperial measurements to conform to the requirements of the new standard. Equivalent imperial measurements if required may be determined from BS 350, “Conversion factors and tables” Part 1, “Basis of tables. Conversion factors” and Part 2, “Detailed conversion tables”. A British Standard does
16、 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 comprises a front cover, an insid
17、e front cover, pages i and ii, pages 1 to 10, 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: sheffieldun sheffieldun, na, Fri
18、Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4951:1973 BSI 03-20001 1 Scope This British Standard covers the dimensions and performance tests for lever and knob furniture for use with locks and latches for doors, and defines test requirements. The dimensional requirements of this st
19、andard only apply to furniture designed for use with mortice locks and latches complying with BS 455. NOTEThe titles of the British Standards referred to in this standard are listed on page 10. 2 Definitions For the purposes of this British Standard the following definitions shall apply: 2.1 lock fu
20、rniture any items of door furniture particularly adapted for use in conjunction with a lock 2.2 latch furniture any items of door furniture particularly adapted for use in conjunction with a latch 2.3 spindling system the various features of design and manufacture of door furniture and, to some exte
21、nt, the followers of locks permitting one or more of the following functions to be performed satisfactorily: 1) rotating the follower of the lock or latch, and hence withdrawing the latch bolt 2) connecting the knob or lever handle to the spindle 3) allowing for different thicknesses of doors 4) tra
22、nsmitting the imposed loads. 3 Selection of test samples 3.1 Specimens submitted to test shall be random production samples of the product. 3.2 If any sample from the initial batch should fail, then a further six samples for each failed sample shall be submitted to test without further failure in or
23、der to comply with this standard. 4 Workmanship The furniture and its components shall be free from burrs and defects likely to affect adversely the appearance, performance, or safety aspects of the furniture during fixing and use. 5 Dimensions and fixing systems The dimensions of lever and knob fur
24、niture and their fixings shall be in accordance with the following clauses. 5.1 Bolt fixing systems 5.1.1 Bolt fixing systems in which the bolts pass through lock or latch case shall have centres at 38 0.25 mm equally disposed about the spindle on the horizontal or the vertical axis. The fixing bolt
25、s shall be not greater than 5 mm in diameter. Bolt fixing systems shall be in accordance with Figure 1. 5.1.2 Bolt fixing systems not obstructed by the lock or latch case shall have the following minimum dimensions. 1) For locks. Spindle centre to top bolt centre, 35 mm. Spindle centre to bottom bol
26、t centre, 85 mm. (See also Note 1 following 5.7 below.) 2) For latches. Spindle centre to top bolt centre, 29 mm. Spindle centre to bottom bolt centre, 29 mm. (See also Note 1 following 5.7 below.) 5.2 Screw fixing systems. Screw fixing systems shall have screws which shall not foul the lock or latc
27、h case as defined in BS 455. 5.3 Other fixing systems. Other fixing systems shall be deemed to comply with this standard provided they meet the performance requirements. 5.4 Keyhole centre dimensions. Keyhole centre dimensions shall be 57 mm 0.8 mm from centre of spindle as shown in Figure 2. 5.5 Ke
28、yhole dimensions. Keyhole dimensions shall be as shown in Figure 2. 5.6 Delineation of measurements 5.6.1 Lengths of levers and knobs shall be measured in accordance with Figure 3. 5.6.2 Projection of levers and knobs shall be measured in accordance with Figure 4. 5.6.3 Length and width of plates fo
29、r lock or latch shall be measured in accordance with Figure 5 and shall be overall sizes. 5.6.4 Diameter or square of roses shall be overall. 5.7 The spindle. The spindle used for interconnecting the levers or knobs through the lock shall be 7.6 0.05 mm square and shall be of such a length that in a
30、ll circumstances the engagement of the spindle into the levers or knobs is not less than 12.00 mm into each side simultaneously, when fitted to doors of 33 mm to 46 mm finished thickness (see BS 459-2). Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy
31、, (c) BSI BS 4951:1973 2 BSI 03-2000 NOTE 1The minimum dimensions in 5.1.2 1) and 5.1.2 2) are approximately 10 mm large than the corresponding dimensions of cases for locks and latches complying with BS 455, (patterns L4, L5 and L9). Locks and latches with larger cases are also available. Whenever
32、these are used, furniture with suitably increased bolt centres should be selected. NOTE 2Where requested by the purchaser, spindles of 8 mm square may be supplied. In such cases, provided the other requirements of the standard are met, the furniture shall be deemed to comply with the standard. NOTE
33、3In the event of the spindle system being fully floating it is essential that the spindle be of such length as will permit engagement to full depth of cored hole in one side and simultaneously permit of minimum 12.00 mm engagement in other side. NOTE 4When the door is of a finished thickness differe
34、nt from 33 mm to 46 mm finished thickness, the manufacturer requires to be advised of the thickness to enable him to supply a spindle of the appropriate length. 6 Materials All components shall be manufactured from materials complying with or equivalent to the appropriate British Standard where such
35、 standard is available. Metals likely to promote electrolytic action shall not be used in direct contact with each other unless suitably protected. 7 Finishes 7.1 Electroplated coatings of nickel or chromium shall be in accordance with the provisions of BS 1224 appropriate to the conditions of servi
36、ce specified. 7.2 Anodized aluminium alloys shall be in accordance with the provisions of BS 1615 appropriate to the conditions of service specified. 7.3 Any other finish shall be to the appropriate British Standard where available for that particular finish and service. Where no British Standard ex
37、ists, obligation is laid on the manufacturer to specify the finish used. 8 Tests 8.1 This standard recognizes two categories of performance of lock and latch furniture: Category 1 Suitable for heavy duty (public use generally) Category 2 Suitable for normal duty (residential dwellings generally). 8.
38、2 The method used to secure the specimens to test blocks is defined in Appendix A. 8.3 Specimens shall be submitted to and comply with the test routine in the following sequence: 9 Conditions of test The specimens shall be tested in the “as received” condition using the fixing and spindling system r
39、ecommended by, or supplied by, the manufacturer. 10 Marking Lock and latch furniture manufactured in compliance with this British Standard shall be marked with the following particulars. 1) The name, trade mark or other means of identification of the manufacturer. 2) The number of this British Stand
40、ard, i.e. BS 4951. NOTE 1The mark BS 4951 on or in relation to the product is a claim by the manufacturer that it complies with the requirements of this standard. NOTE 2Attention is drawn to the certification facilities offered by BSI; see the inside back cover of this standard. Test number Nature o
41、f testSpecified in 1Examination of workmanship, materials and finishes Clauses 4, 6 and 7 2Strength of return mechanism (torque test) Appendix B 3Strength of furniture and methods of fixing (tensile test) Appendix B 4Durability of mechanism (wear test) Appendix B 5Test 3 repeatedAppendix B 6Test 2 r
42、epeatedAppendix B Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4951:1973 BSI 03-20003 Appendix A Fitting of specimens to test blocks A.1 After completion of test no. 1 (specified in 8.3) the specimens shall be mounted on test blocks. T
43、hese blocks shall be 33 mm finished thickness and shall be made of whitewood (European), straight grained and free from defects. The test pieces shall be prepared as follows: 1) The appropriate lock and latch shall be fitted to the blocks in the manner prescribed by BS 2088. The performance of the l
44、ock or latch shall be not less than that called for in BS 2088. In the case of non-spring loaded furniture, the lock or latch shall be of a type incorporating a sprung follower of adequate strength to support the levers. The two component halves of the specimen shall be fixed to opposite faces of th
45、e test block, inter-connected through the block and the lock follower by means of the spindling system supplied with the specimen by the manufacturer. 2) Spring-loaded furniture. For the purpose of conducting tests no. 2 and 6 (see B.2 and B.6 in Appendix B) spring-loaded furniture shall be mounted
46、as for 1) above, incorporating a spindling system but omitting the lock or latch. 3) Non-spring loaded furniture. For the purpose of conducting tests no. 2 and 6 (see B.2 and B.6 in Appendix B) non-spring loaded furniture shall be mounted as for 1) above. 4) The fixing screws, bolts or other devices
47、 used shall be those supplied by, or recommended by, the manufacturer. Appendix B Mechanical tests B.1 Definition The original rest position of the levers is defined as the position of the levers before commencing the test procedure. This position shall be measured and recorded. B.2 Strength of retu
48、rn mechanism (test no. 2) Figure 6 shows a suitable test rig. The specimens mounted on the test block in accordance with A.1 2) or A.1 3) of Appendix A shall be subjected to the following tests. 1) A torque of 0.25 N m shall be applied to one of the levers. This torque shall not produce any angular
49、movement of the lever from the original rest position. 2) A constant torque of 1.50 N m shall produce a movement of the lever of a minimum of 60. On removal of the torque, the lever shall return to its original rest position within a deviation of 4. 3) The lever shall now be rotated through intermediate angles from 0 to 60 at 10 intervals and shall always return to its original rest position within a deviation of 4. B.3 Strength of furniture and methods of fixing (test no. 3) The use of normal tensile testing procedure is preferred