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INTERNATIONAL
4252
STANDARD
Second edi tion
1992-12-15
- Operator’s workplace,
Agricultural tractors
access and exit - Dimensions
Tracteurs agricoles - Poste de travail de I’operateur, acc& et sortie -
Dimensions
Reference number
ISO 4252: 1992(E)
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ISO 4252:1992(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the
work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
DrafI International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 4252 was prepared by Technical Committee
ISO/TC 23, Trattors and machinery for agriculture and forestry, Sub-
Committee SC 3, Safety and comforf of the Operator.
This second edition cancels and replaces the first edition
(ISO 4252:1983). The changes are noted in the introduction.
0 ISO 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, eiectronic 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
Printed in Switzerland
ii
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ISO 4252:1992(E)
Introduction
In the revision of this International Standard to adopt “Seat Index
Point” (SIP) in place of “Seat Reference Point” (SRP), the mean seat
Position is used in accordance with ISO 5353. The seating Position is
therefore moved to the mean horizontal from the rearmost Position used
in previous editions. Half the minimum horizontal adjustment as stated
in ISO 4253 is the adjustment figure used.
To adopt the seat index Point (SIP) in place of the seat reference Point
(SRP), the relationship of SIP 90 mm above and 140 mm in front of the
SRP has been used. This relationship should be used when converting
from SRP to SIP or vice versa.
This International Standard is now in conformity with the 1992 Amend-
ment (ISO 3462:1980/Amd. 1:1992) to the 1980 edition of ISO 3462, Trac-
tors and machinery for agriculture and forestry - Seat reference
point - Method of determination.
The 1983 edition of this International Standard included a clause 6,
which dealt with the Iimiting dimensions for Steps: this has been deleted
from this edition as the subject is covered in ISO 4254-1.
. . .
Ill
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INTERNATIONAL STANDARD ISO 4252:1992(E)
- Operator’s workplace, access and
Agricultural tractors
- Dimensions
exit
3 Definitions
1 Scope
For the purposes of this International Standard, the
This International Standard specifies design dimen-
following definitions apply.
sions of a tractor for agriculture concerning
a) minimum dimensions of access doorways; 3.1 emergency exit: Means of exit which is capable
of being opened from the inside of the cab: it may
b) number, location and minimum dimensions of be a normal access door.
emergency exits;
3.2 access door [doorway]: Means of entry to and
c) minimum internal clearance dimensions.
exit from the workplace or cab.
lt applies to tractors for agriculture having a mini-
mum track width exceeding 1 150 mm.
4 Access doorway(s)
The minimum dimensions of the access doorway
aperture, both for the frame and with the door open
shall be as shown in figures 1 and 2.
2 Normative references
The following Standards contain provisions which,
through reference in this text, constitute provisions
5 Emergency exits
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All stan-
5.1 Number and location
dards are subject to revision, and Parties to
agreements based on this International Standard
are encouraged to investigate the possibility of ap- There shall be a minimum of three emergency exits,
each of which shall be on a different side of the cab:
plying the most recent editions of the Standards in-
dicated below. Members of IEC and ISO maintain the front, rear
...