1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN ISO 7493:2006 has the status of a British StandardICS 11.060.20Dentistry O
2、perators stoolBRITISH STANDARDBS EN ISO 7493:2006BS EN ISO 7493:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2006 BSI 2006ISBN 0 580 49016 5Cross-referencesThe British Standards which implement international or European publica
3、tions referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necess
4、ary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page,
5、 the ISO title page, pages ii to iv, pages 1 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this subcommittee can be obtained on requ
6、est to its secretary. present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard
7、 is the official English language version of EN ISO 7493:2006. It is identical with ISO 7493:2006. It supersedes BS EN ISO 7493:2000 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee CH/106, Dentistry, to Subcommittee CH/106/6, Dental equipment, which ha
8、s the responsibility to: aid enquirers to understand the text;EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 7493May 2006ICS 11.060.20English VersionDentistry - Operators stool (ISO 7493:2006)Art dentaire - Sige doprateur (ISO 7493:2006) Zahnheilkunde - Arbeitsstuhl (ISO 7493:2006)This Europe
9、an Standard was approved by CEN on 13 April 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concern
10、ing such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own langu
11、age and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta
12、, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitat
13、ion in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 7493:2006: EForeword This document (EN ISO 7493:2006) has been prepared by Technical Committee ISO/TC 106 “Dentistry“ in collaboration with Technical Committee CEN/TC 55 “Dentistry“, the secretariat of which
14、is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. According to the CEN/CENELEC In
15、ternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Net
16、herlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 7493:2006 has been approved by CEN as EN ISO 7493:2006 without any modifications. EN ISO 7493:2006Reference numberISO 7493:2006(E)INTERNATIONAL STANDARD
17、ISO7493Third edition2006-05-01Dentistry Operators stool Art dentaire Sige doprateur EN ISO 7493:2006ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is nor
18、mally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in
19、the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepar
20、e International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that som
21、e of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7493 was prepared by Technical Committee ISO/TC 106, Dentistry, Subcommittee SC 6, Dental equipment. This third edition cancels and replaces th
22、e second edition (ISO 7493:1997) and its Technical Corrigendum 1:1999, which have been technically revised. The following changes were made: a) The requirements for seat height and range of adjustment (see 4.2 in this edition) have been changed to reflect ISO 7493:1997 Technical Corrigendum 1. b) A
23、requirement for sampling has been added (Clause 5). c) The test procedure for the stability of the stool has been revised (see 6.5). Figure 1 has been revised to reflect this change. d) The test procedure for cleaning and disinfection has been revised (see 6.8). e) References to ISO 6385 and ISO 112
24、26 have been added to Annex A. EN ISO 7493:2006iv Introduction The objectives of this International Standard are to ensure that the design and functioning of the operators stool in the dental office will be such as to enable the dental operator to perform his or her work effectively and safely, to m
25、inimize the muscular and skeletal stresses, particularly in shoulders and spine, that arise during the performance of the work, and to allow freedom of movement without undue muscular activity. EN ISO 7493:20061Dentistry Operators stool 1 Scope This International Standard specifies requirements, rec
26、ommendations and test methods for the operators stool in the dental office as well as requirements for the manufacturers instructions for use and for marking and packaging. It also covers recommendations to manufacturers on the design of operators stools. For purposes of this International Standard,
27、 the term “dental operator” includes dentists, dental assistants and dental hygienists. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition o
28、f the referenced document (including any amendments) applies. ISO 1942 1), Dentistry Vocabulary ISO 8191-1, Furniture Assessment of the ignitability of upholstered furniture Part 1: Ignition source: smouldering cigarette ISO 9687, Dental equipment Graphical symbols ISO 21530, Dentistry Materials use
29、d for dental equipment surfaces Determination of resistance to chemical disinfectants 3 Terms and definitions 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1942 and the following apply. 3.1.1 operators stool movable seat, adjustable in height, wh
30、ich satisfies the general requirements relevant to the performance of dentistry by a seated operator 3.1.2 anterio-posterior plane vertical plane which divides the operators stool into left and right halves 3.1.3 seat height vertical distance between the floor and the point of intersection of the sw
31、ivel axis with the plane of the loaded surface or the unloaded surface of the seat 1) To be published. Revision of ISO 1942 (all parts):1989. EN ISO 7493:20062 3.1.4 seat width horizontal dimension of the widest part of the seat between the upper edges of the sides of the seat, measured perpendicula
32、rly to the anteroposterior plane of the seat 3.1.5 seat depth horizontal dimension measured alongside the centre of the seat width in the anteroposterior plane of the seat between the vertical projections of the front edge and the back edge of the seat NOTE If the stool is provided with a backrest,
33、the dimension is measured between the foremost projection of the centreline of the backrest and the normal projection of the front edge of the seat. 3.1.6 backrest height vertical distance between reference Point A and reference Point B, measured with the seat loaded and with an unloaded backrest (i
34、n free-standing position) For this measurement, it is necessary to adjust the backrest to its most forward position and, if it can be pivoted upon a horizontal axis, to put it in the vertical position. 3.1.7 least favourable position of the operators stool position of the operators stool at which th
35、e load-bearing part of the seat and two adjacent castors are placed in their least favourable position with regard to the seat-tipping stability 3.2 Symbols Figure 1 shows the following symbols: h1seat height for loaded surface; h2seat height for unloaded surface; h3backrest height; c1seat depth; c2
36、seat depth, if a backrest is provided; c3seat width; e horizontal distance between the line connecting the swivel axis and the axis of two adjacent castors in their least favourable position; A reference Point A, the point of intersection of the plane of the upper-loaded surface of the seat with the
37、 vertical axis of the stool; B reference Point B, the centre of the area on the backrest that provides lumbar support and point of application of the force for testing the deflection of the backrest; C reference Point C, the point on the vertical axis where the vertical force for testing the load-ca
38、rrying capacity of the stool is applied; D reference Point D, the point on the upper plane of the unloaded seat at a distance of 60 mm from the least favourable edge of the seat where the vertical and horizontal forces for testing the stability of the stool are applied (the magnitude and direction o
39、f the forces to be applied in the stability test are depicted for clarity); E reference Point E, the point for the application of vertical force for testing the armrest; F reference Point F, the point for the application of horizontal force for testing the armrest; G reference Point G, the point for
40、 the application of horizontal force for testing the armrest. EN ISO 7493:20063Dimensions in millimetres Key 1 floor 2 test pad 1 3 test pad 2 4 stop NOTE 1 This figure is not intended to specify the design of the operators stool. The armrest depiction represents either an armrest or the torso suppo
41、rt, if provided. NOTE 2 The lower right drawing projection is rotated around axis Z by 45. Figure 1 Designation of dimensions and reference points for the operators stool EN ISO 7493:20064 4 Requirements 4.1 General 4.1.1 Compliance with the following requirements shall be checked by visual inspecti
42、on. 4.1.2 The seat of the operators stool shall be adjustable in height and shall swivel freely around the vertical axis. 4.1.3 The upper part of the operators stool shall not be removable from the base without the use of a tool. 4.1.4 The operators stool should be provided with a backrest which can
43、 be adjusted horizontally and vertically independent of the seat height. 4.1.5 The operators stool should be provided with five castors arranged pentagonally on the base of the stool. 4.2 Seat height and range of adjustment The minimum adjustable height of the loaded seat and the range of adjustment
44、 of the seat height shall be given by the manufacturer with the instructions for use. 4.3 Load-carrying capacity of operators stool The operators stool shall not have a change in height exceeding 10 mm when tested in accordance with 6.4. 4.4 Stability of operators stool The operators stool shall not
45、 tip during testing. Testing shall be carried out in accordance with 6.5. 4.5 Deflection of the backrest The backrest, if provided, shall not show a horizontal deflection at reference Point B that exceeds 30 mm, when tested in accordance with 6.6. 4.6 Armrest and torso support The armrests or torso
46、support, if provided, shall be capable of withstanding without failure or permanent deformation when tested in accordance with 6.7. 4.7 Cleaning and disinfection All exterior parts of the operators stool shall be capable of being cleaned and disinfected, using agents recommended by the stool manufac
47、turer, without deteriorating the stools surface and markings. Testing shall be carried out in accordance with 6.8. 4.8 Flammability The upholstery and padding of the operators stool shall not catch fire and resultant charring, if any, shall not be greater in length than 30 mm in any direction measur
48、ed from the nearest point of the test cigarette. Testing shall be carried out in accordance with 6.9. EN ISO 7493:200655 Sampling Use one representative sample of the operators stool. 6 Test procedures 6.1 General All tests described in this International Standard are type tests. 6.2 Visual inspecti
49、on Visual inspection shall be performed at normal visual acuity without magnification. 6.3 Apparatus For the tests the following apparatus shall be used. 6.3.1 Operators stool. 6.3.2 Test pad 1, having a 350 mm diameter and a radius of 15 mm at the edge (see Figure 1). 6.3.3 Test pad 2, having a 100 mm diameter and a radius of 15 mm at the edge (see Figure 1). 6.4 Load-carrying capacity of stool Adjust the seat height to its maximum value. Select and mark a suitable point on the seat,
