SIST EN ISO 7493:2000
(Main)Dental Operator's stool (ISO 7493:1997, including Technical Corrigendum 1:1999)
Dental Operator's stool (ISO 7493:1997, including Technical Corrigendum 1:1999)
Migrated from Progress Sheet (TC Comment) (2000-07-10): Email of 1998-03-13: UAP on ISO 7493:1997 (TA/980316) ++ ** ATTENTION** Email of 1998-03-17: ISO will issue a technical corrigendum--> ++ UAP to be launched on ISO 7493:1997 + Corrigendum (by the end of 1998) TA/980317 ++ -->Disregard Email of 1998-03-13!
Zahnärztlicher Arbeitsstuhl (ISO 7493:1997, einschließlich Technische Korrektur 1:1999)
Diese Internationale Norm legt Anforderungen, Empfehlungen und Prüfverfahren für zahnärztliche Arbeitsstühle sowie Anforderungen an die Gebrauchsanweisung des Herstellers, die Kennzeichnung und die Verpackung fest. Sie enthält ferner Empfehlungen an die Hersteller bezüglich der Konstruktion dieser Arbeitsstühle. ANMERKUNG: In dieser Internationalen Norm enthält der Begriff "zahnärztlicher Behandler" Zahnarzthelfer/innen und Dentalhygieniker.
Siege d'opérateur dentaire (ISO 7493:1997, Rectificatif technique 1:1999 inclus)
Dental Operator's stool (ISO 7493:1997, including Technical Corrigendum 1:1999)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7493:2000
01-november-2000
1DGRPHãþD
SIST EN 27493:2000
SIST EN 27493:2000/AC1:2000
Dental Operator's stool (ISO 7493:1997, including Technical Corrigendum 1:1999)
Dental Operator's stool (ISO 7493:1997, including Technical Corrigendum 1:1999)
Zahnärztlicher Arbeitsstuhl (ISO 7493:1997, einschließlich Technische Korrektur 1:1999)
Siege d'opérateur dentaire (ISO 7493:1997, Rectificatif technique 1:1999 inclus)
Ta slovenski standard je istoveten z: EN ISO 7493:2000
ICS:
11.060.20 =RERWHKQLþQDRSUHPD Dental equipment
SIST EN ISO 7493:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 7493:2000
INTERNATIONAL
STANDARD
Second edition
1997-05-O 1
Dental operator ’s stool
Si&ge d ’opbrateur dentaire
Reference number
IS0 7493:1997(E)
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SIST EN ISO 7493:2000
IS0 7493: 1997(E)
Foreword
lS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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 the work. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 7493 was prepared by Technical Committee
ISOflC 106, Dentistry, Sub-Committee SC 6, Dental equipment
This second edition cancels and replaces the first edition (IS0 7493:1985),
which has been technically revised.
Annex A of this International Standard is for information only.
0 IS0 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internetcentral@ isocs.iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
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SIST EN ISO 7493:2000
IS0 7493:1997(E)
@ IS0
Introduction
The objectives of this iinternational Standard are to ensure that the design
and functioning of dental operator ’s stools will be such as to enable the
dental operator to perform his or her work effectively and safely, to
minimize 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.
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SIST EN ISO 7493:2000
IS0 7493:1997(E)
INTERNATIONAL STANDARD @ IS0
Dental operator ’s stool
1 Scope
This International Standard specifies requirements, recommendations and methods of test for dental operator ’s
instructions, marking and packaging. It covers also
stools as well as requirements for manufacturer ’s
recommendations to manufacturers on the design of stools.
NOTE - For the purposes of this International Standard, “dental operator” includes dental assistants and dental hygienists.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 1942-4:1989, Dental vocabulary - Part 4: Dental equipment.
IS0 8191-I :I 987, Furniture - Assessment of the ignitability of upholstered furniture - Par? I: Ignition source:
smouldering cigarette.
IS0 9687:1993, Dental equipment - Graphical symbols.
Part 1: General requirements for safety.
IEC 601-I :I 988, Medical electrical equipment -
3 Definitions
For the purposes of this International Standard, the definitions in IS0 1942-4 and the following definitions apply.
3.1 dental operator ’s stool: Movable seat, adjustable in height, which satisfies the general requirements
relevant to the performance of dentistry by a seated operator. [ISO 1942-2:1989, 4.0211.
3.2 seat height, hl or h2 (see figure 1): Vertical distance between the floor and the point of intersection of the
swivel axis with the plane of the loaded surface (hl) or the unloaded surface (h2) of the seat.
3.3 seat width, b (see figure 1): Horizontal dimension of the widest part of the seat between the upper edges of
the sides of the seat, measured perpendicularly to the anteroposterior plane of the seat.
3.4 seat depth, cl or c2 (see figure 1): Horizontal dimension (cl) measured alongside the centre of width b in
the anteroposterior plane of the seat between the vertical projections of the front edge and the back edge of the
seat.
If the stool is provided with a backrest, the dimension (~2) is measured between the foremost projection of the
centreline of the backrest and the normal projection of the front edge of the seat.
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SIST EN ISO 7493:2000
IS0 7493: 1997(E) @ IS0
3.5 backrest height, h3 (see figure 1): Vertical distance between reference points A and B, measured with the
seat loaded and with an unloaded backrest (in free-standing position).
For this measurement the backrest shall be adjusted in its most forward position and, if it can be pivoted upon a
horizontal axis, it shall be put in the vertical position.
3.6 least favourable position of the stool: Position of the stool at which the load-bearing part of the seat
and two adjacent castors are placed in their least favourable position with regard to the seat-tipping stability.
In the design shown in figure I, this position is identified by e, which is the horizontal distance between the line
connecting the swivel axis and the axes of two adjacent castors in their least favourable position.
NOTE - This figure is not intended to specify the design of the dental operator ’s stool.
Test pad2
/-
Unloaded surface
TLoadedsurface 1
_-_-.----
\: ‘L
Testpadl
c”
Cl
-
Jc
\I1 \If
I
---- ----
D
Figure 1 - Dental operator ’s stool
2
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SIST EN ISO 7493:2000
@ IS0 IS0 7493: 1997(E)
4 Requirements and recommendations
4.1 General
Compliance shall be checked by visual inspection.
4.1.1 The seat of the dental operator ’s stool shall be adjustable in height and shall swivel freely around the vertical
axis.
4.1.2 The upper part of the dental operator ’s stool shall not be removable from the base without the use of a tool.
and
4.1.3 The dental operator ’s stool should be provided with a backrest which can be adjusted horizontally
vertically independent of the seat height.
4.1.4 The dental operator ’s stool should be provided with five castors arranged pentagonally on the base o the
stool.
4.2 Reference points used in figure 1
4.2.1 Reference point A: Point of intersection of the plane of the upper loaded surface of the seat with the vertical
axis of the stool.
4.2.2 Reference point B: Centre of the area on the backrest that provides lumbar support. Point of application of
the force for testing the deflection of the backrest.
4.2.3 Reference point C: Point on the vertical axis where the vertical force for testing the load-carrying capacity of
the stool is applied.
4.2.4 Reference point D: Point on the upper plane of the unloaded seat at a distance of 60 mm from the least
favourable edge of the seat where
...
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