1、BRITISH STANDARDBS ISO 4252:2007Agricultural tractors Operators workplace, access and exit DimensionsICS 65.060.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43
2、g55g3g47g36g58BS ISO 4252:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007ISBN 978 0 580 55580 0National forewordThis British Standard is the UK implementation of ISO 4252:2007.The UK participation in its preparat
3、ion was entrusted to Technical Committee AGE/6, Agricultural tractors and forestry machinery.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsibl
4、e for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsINTERNATIONALSTANDARDISO4252Third edition2007-11-01Reference numberISO 4252:2007(E)Agricultural tractors Operators workplace, access
5、 and exit DimensionsTracteurs agricoles Poste de travail de loprateur, accs et sortie DimensionsBS ISO 4252:2007ii iiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standa
6、rds is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take p
7、art in the work. ISO collaborates closely with the InternationalElectrotechnical 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 pr
8、epare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that so
9、me of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 4252 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture andforestry, Subcommittee SC 4, Tractors.This third e
10、dition cancels and replaces the second edition (ISO 4252:1992), which has been technically revised.BS ISO 4252:2007blank1Agricultural tractors Operators workplace, access and exit Dimensions1ScopeThis International Standard specifies the design dimensions of agricultural tractors having a minimum tr
11、ackwidth exceeding in respect of a) the minimum dimensions of their access doorways,b) the number, location and minimum dimensions of their emergency exits, andc) their minimum internal clearance dimensions.2 Normative referencesThe following referenced documents are indispensable for the applicatio
12、n of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 789-6, Agricultural tractors Test procedures Part 6: Centre of gravityISO 5353, Earth-moving machinery, and tractors an
13、d machinery for agriculture and forestry Seat index point3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1 emergency exitmeans of exit that can be opened from the inside of the cabinNOTE It can be a normal access door.3.2 access doordoorwaymeans
14、of entry to, and exit from, the workplace or cabin3.3 mountain tractorfour-wheel drive agricultural or forestry tractor whose interchangeable equipment is intended for agricultural orforestry use and which is characterized by a supporting frame, one or more power take-offs, a technicallypermissible
15、mass not greater than at a ratio to the maximum unladen mass in running order of less than2,5, and which has a centre of gravity less than , determined in accordance with ISO 789-6 andmeasured in relation to the ground using the tyres that are normally fitted1 150 mm10 t850 mmBS ISO 4252:200724 Acce
16、ss doorway(s)The minimum dimensions of the access doorway aperture, both for the frame and with the door open, shall beas shown in Figures 1 and 2. For tractors where the seat can be reached straight from the footstep, the heightsat which the widths are measured may be decreased.Dimensions in millim
17、etresFigure 1 Access doorway dimensionsKey1 wheel or other tractor partMinimum dimension according to Figure 1.Figure 2 Example of limitation of dimensions with door openMBS ISO 4252:200735 Emergency exits5.1 Number and locationThere shall be a minimum of two emergency exits, each of which shall be
18、on a different side of the cabin: thefront, rear and roof of the cabin may be considered as sides for this purpose.NOTE In order to meet market needs and/or national regulations, two emergency exits can be necessary in addition to anaccess door.Any window of sufficient size may be designated as an e
19、mergency exit if it is made of breakable glass that canbe broken with a tool provided in the cab for that purpose. Laminated glass, plastic or double glass are notconsidered breakable for the purposes of this International Standard.5.2 DimensionsThe cross-sectional dimensions of each emergency exit
20、shall be large enough to enclose an ellipse withprincipal axes of and .6 Internal clearance dimensionsThe minimum clearance dimensions inside the cab shall be as shown in Figure 3 and in accordance withTable 1. The clearance dimensions for the hand controls (see Figure 3) shall be in accordance with
21、 Table 2.These dimensions are defined in relation to the vertical reference plane, which is generally longitudinal to thetractor and passes through the seat index point (SIP) and the steering-wheel centre. The SIP shall bedetermined in accordance with ISO 5353.These dimensions are valid for tractors
22、 with only one operator position.For verification purposes, the seat shall be set in the rearmost longitudinal position and at the mid-point of theheight adjustment range. Seats having a suspension system whether or not adjustable according to thedrivers weight shall be set to the mid-point of the s
23、uspension travel.640 mm 440 mmBS ISO 4252:20074Dimensions in millimetresFigure 3 Minimum internal clearance dimensionsBS ISO 4252:20075Key1 left cab wall2 right cab wall3 hand controls4SIPequal to half the horizontal seat adjustmentaValid for tractors with only one operator position. Not applicable
24、for mountain tractors when the drivers seat SIP is morethan from the median longitudinal plane of the tractor. For other mountain tractors, the dimension may bereduced to at a height of above SIP and to at a height of above SIP.bSee Table 2.cThe clearance zone, as defined in this region by the radiu
25、s, may be reduced for cabins where the limitingoverall tractor maximum dimensions are of prime importance and/or for the accommodation of specific roof-mountedequipment.Table 1 Minimum internal clearance dimensionsDistanceDimensionmin./mmDistance from a point below and behind the SIP to any part of
26、the cabceiling surface, above, forward and to either side of the operators heada1050Distance from SIP to the cab back wall at a height between above the SIP and the roofcontour defined by the radius and the blend radiusLateral clearance at any distance between above the SIP and the roof contour asde
27、fined by the radius, perpendicular to the vertical reference plane for a distance offorward and rearward from the SIP450Distance from the outer side of the steering-wheel rim to the cab surface or other hand controlsb80is equal to half the horizontal seat adjustment.aSoft materials such as padding m
28、ay penetrate into the free space up to a maximum of .bExcluding hand controls mounted on the steering-column.Table 2 Clearance dimensions for hand controlsControl/type of controlDimensionamin./mmControls that require an operating force of and engine controls 50Controls that require an operating forc
29、e of to (other than engine controls) 25For controls that require an operating force of less than , maintain adequate clearance for operation.aThese minimum distances shall be valid for all control positions.Figure 3 Minimum internal clearance dimensions (continued)ah100 mm 450 mm350 mm 310 mm 300 mm
30、 810 mm1 150 mm90 mm (140 + ah)mm210 mm1 050 mm 150 mm290 + ah310 mm1 050 mm(310 ah)mm (140 + ah)mmah50 mm 150 N80 N 150 N80 NBS ISO 4252:20076Bibliography1 ISO 4253, Agricultural tractors Operators seating accommodation DimensionsBS ISO 4252:2007blankBS ISO 4252:2007BSI389 Chiswick High RoadLondonW
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