CELEX: 51977PC0317
Language: en
Date: 1977-07-13
Title: PROPOSAL FOR A COUNCIL DIRECTIVE ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO THE DRIVER'S SEAT ON WHEELED AGRICULTURAL OR FORESTRY TRACTORS (submitted to the Council by the Commission)

ARCHIVES HISTORIQUES
DE LA COMMISSION
COLLECTION RELIEE DES
DOCUMENTS "COM"
COM (77) 317
Vol. 1977/0106
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 ---pagebreak---   COMMISSION OF THE EUROPEAN COMMUNITIES
                                                               COM(77)317 final.
                                                          Brussels , 13 July 1977
                          PROPOSAL FOR A COUNCIL DIRECTIVE
          ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES
                        RELATING TO THE DRIVER 'S SEAT
              ON WHEELED AGRICULTURAL OR FORESTRY TRACTORS
                     ( submitted to the Council "by the Commission)
                                   i'P
                                     V  ^
                                         C         H
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COK(77 ) 317 final .
 ---pagebreak---                        EXPLANATORY MEMORANDUM
  GENERAL REMARKS
 The Community type-approval procedure for wheeled agricultural and fore­
  stry tractors , which was the subject of Council Directive 7^/150/EEC of
 k March 197^ O ), provides the general frame of reference for the chapter
 on seats , including the driver 's seat .
 On 23 July 1968 (2 ), the Commission forwarded to the Council a proposal
 for a directive, on certain components and characteristics of wheeled
 agricultural tractors , in which the requirements relating to the dri­
 ver 's seat were laid down in Section XIII of the technical annex .
 The Council felt that it whould not be expedient to examine these re­
 quirements prior to the adoption of the Directive on type-approval ,
 since the latter would introduce the administrative procedure to be fol­
 lowed in the various directives on technical aspects . The Directive on
 type-approval , which was proposed by the Commission in July 19&8 , was
 not adopted by the Council until March 197^. Hence the requirements
 under Section XIII of the July 1968 proposal for a directive on certain
 components and characteristics are now completely outdated on account
 of the importance which has been assumed in the meanwhile by the ques­
 tion of protection for the tractor driver when he is driving on the
road or , operating the tractor on the land .
With the aim of following up and , if possible , carrying further the
progress that has been made towards protecting the tractor driver , the
Commission decided to revise its original proposal . The amendments
were so considerable that it wa6 necessary to draw up a new proposal
for a directive .
                                                        • • •/ • • •
( 1 ) OJ No L ok of 28 March 197**
( 2 ) OJ No C 125 of 28 November 1968
 ---pagebreak---                                   - 2 -
     In August 197^ t the Danish Government notified the Commission , in ac­
     cordance with the Agreement of the Governments of the Member States
     meeting in Council of 28 May 19&9       amended on 5 March 1973 ) concer­
     ning standstill and information for the Commission ( 1 ), of its inten­
     tion to legislate on this matter .   The Commission informed that Govern­
     ment of its intention of forwarding to the Council a new proposal for
     a directive and expedited its work in this field . However , the techni­
     cal complexity of the new requirements relating to the driver 's seat
     prevented the Commission from completing its work within the time li­
     mit laid down in the "Standstill Agreement ".   The Danish Government ,
     aware of the difficulties encountered by the Commission in drawing up
     this proposal , has deferred putting into force of the national require­
     ments envisaged , at the same time stressing the urgent necessity for
     the Community to arrive at a common solution as soon as possible .
II . TECHNICAL CONSIDERATIONS
     This proposal for a directive lays down the construction and testing
     specifications necessary for EEC type-approval of driver 's seats as
     components of wheeled agricultural or forestry tractors , together with
     the requirements for fitting a driver 's seat to the tractor for EEC
     type-approval of the latter .   The seat construction specifications con­
     cern in particular the dimensions of the seat surface , the position
     and inclination of the backrest , the adjustment of the seat and the vi­
     bratory movement of the seat . The specifications in respect of the
     tests to be carried out concern in particular the important aspect of
     the vibrations to which the human body as a whole is exposed . Although
     the data on the endurance of vibrations by the human body and on the
     body 's reactions are not yet quite complete , present scientific know­
     ledge can be considered reliable enough to enable tests to be proposed
                                                            • • •/ • • •
     ( 1 ) OJ No C 76 of 17 June 1969
           OJ No C  9 of 15 March 1973
 ---pagebreak---                                        - 3 -
        to which the driver 's seats must be subjected in order that the jol­
        ting and the vibrations can be reduced as much as possible . The ob­
        ject of the tests proposed is to determine ( a) the characteristics of
        the suspension system and of the adjustment range as a function of the
       driver 's weight , ( b ) the lateral stability and ( c ) the vertical vibra­
       tory movement . The vibratory movement of the seat is to be determined ,
       according to the type of tractor for which the seat is intended , by
       means of tests on a standardized track and/or on a test bench .
       EEC type-approval will be granted for any type of driver 's seat which ,
       after verification , satisfies the requirements laid down by the direo-
       tive , and a type-approval number will be assigned to the entire series
       of this type of seat .
       EEC type-approval of a tractor type in respect of the driver 's seat
       will be granted if the seat bears the EEC type-approval mark and if it
       is fitted to the tractor in accordance with the requirements laid down
       therefor .
III .  COMMENTS ON THE ARTICLES
       Articles 1 to 6 establish the EEC type-approval procedure for driver 's
       seats .  The purpose of thi6 procedure is to permit the free movement
       of these seats within the Community by prohibiting the Member States
       from preventing their marketing when they comply with the construction
      and test specifications laid down in the annexes and when they bear
      the EEC type-approval mark the model of which is shown in Appendix 11
      to Annex II . This procedure provides for a reciprocal information sys­
       tem in respect of every case of granting , refusing or withdrawing an
      EEC type-approval .
      Article 7 integrates this Directive into the EEC type-approval proce­
      dure .
      As certain new Member States have no national type-approval procedure
      at present , it is necessary to lay down provisions to guarantee the
      use in these Member States of wheeled agricultural or forestry tractors
                                                                • • •/ • • •
 ---pagebreak---                                     - 4 -
     conforming to the requirements of the Directive ( Article 8 ) ( 1 ).
     The scope of this Directive is laid down in Article 9 .
     Article 10 lays dovm the procedure for adapting the directive to tech­
     nical progress .   This procedure is set out in Article 13 of the Council
     Directive of 4 March 1974 on the type-approval of wheeled agricultural
     or forestry tractors .
     Article 11(1 ) lays down two time limits . Before expiry of the first
     time limit , the Member States are obliged to adopt and publish the mea­
     sures necessary for compliance with the Directive . The second time
     limit determines the date on which all the Member States must simulta­
     neously apply the common rules .
     Finally , the Commission must be informed within a reasonable time of
     any draft provisions drawn up by the Member States in the field cove­
     red by the Directive , so that it can formulate any comments it may
     wish to make on the relevant text or texts ( Article 11(2 )).
IV . CONSULTATION OF THE EUROPEAN PARLIAMENT AND THE ECONOMIC AND SOCIAL
     COMMITTEE
     The opinions of these two bodies must be obtained in accordance with
     the provisions of the second paragraph of Article 100 .
      ( 1 ) OJ No L 73 of 27 March 1972 : "Documents concerning the accession
            to the European Communities of the Kingdom of Denmark , Ireland ,
            the Kingdom of Norway and the United Kingdom of Great Britain and
            Northern Ireland". Act concerning the conditions of accession
            and the adjustments to the treaties - Annex I , Section X.
 ---pagebreak---                                         - 1 -
  Draft proposal for a Directive relating -to the driver 's seat on wheeled
  agricultural or forestry tractors ,
  THE COUNCIL OP THE EUROPEAN COMMUNITIES ,
  Having regard to the Treaty establishing the European Economic Community ,,
  and in particular Article 100 thereof ,
  Having re&ard to the proposal from the Commission ,
  Having regard to the Opinion of the European Parliament ,
 Having regard to the Opinion of the Economio and Sooial Committee ,
 Whereas the technical requirements which tractors must satisfy pursuant to
 national laws relate , inter alia , to driver 's seats ;
 Whereas these requirements differ from one Member State to another ,
 whereas it is therefore neoessaxy that all Member States adopt the same
 requirements either in addition to or in place of their existing regul­
 ations , in order to allow the" EEC type-approval procedure which was
 the subject of Council Directive 74/15 O/EEC of 4 March i974 on the
 approximation of the laws of the Member States relating to the type-approval
 of wheeled agricultural or forestry tractors (l ) to be applied in respect
 of each type of tractor;
 Whereas a regulation on driver 's      seats includes not only the requirements
 for their installation on the tractors but also for the construction of
 these seat s ; whereas a harmonized type-approval procedure would enable
 for each Member State to oheck compliance with the common construction and
 testing requirements and to inform the other Member States of its findings
 by sending a copy of the type-approval certificate completed for each type
 of driver* s asat ; whereas the placing of an EEC type-approval mark on all
 driver^seats manufactured in conformity with the approved type obviates
 any need for technical cheoks on these driverfe seats in the other Member
 States ;
Whereas , in order that the reciprocal recognition system by Member States of
the tests carried out by them individually on the basis of the common
   requirements may function properly , these requirements must be
applied by all Member States with effect from the same date ,
HAS ADOPTED THIS DIRECTIVE i
( 1 ) OJ No L 84 , 28. 3.1974 , p. 10
 ---pagebreak---                                      Article 1
1 , Each Member State shall grant EEC component type-approval in respect of
     any type of driver 's seat which satisfies the construction and testing
     requirements laid down in Anrexes I and II.
 2. The Member State which has granted EEC component type-approval shall
    take the measures required in order to verify that production models
    conform to the approved type , in so far as is necessary and if need
    he in cooperation with the competent authorities in the other Member
     States * Such verification shall be effected by means of spot oheoks.
                                     Article 2
Member States shall for each type of driver 's seat which they approve
pursuant to Article 1 , issue to the manufacturer , or to his authorized repre­
sentative , an EEC component type-approval mark conforming to the
model shown in item 3»5 « of Annex II for each type of driver 's seat .
Member States shall take all appropriate measures to prevent the use of
marks liable to create confusion between driver 's seats which have been
type-approved pursuant to Article 1 and other devices.
                                     Article 3
1 . No Member State may prohibit the placing on the market of driver 's
    seats on grounds relating to their construction if they bear the
    EEC oomponent type-approval mark.
2. Nevertheless , a Member State may prohibit the placing on the market
    of driver 's seats hearing the EEC oomponent type-approval mark which
    consistently fail to conform to the approved prototype .
    That State shall forthwith inform the other Member States and the
    Commission of the measures taken, specifying the reasons for its
    decision.
 ---pagebreak---                                       - 3 -
                                    Ai-tiole 4
 The oompetent authorities of each Member State shall within one month
  send to the oompetent authorities of the other Member States a copy of
 the oomponent type–approval certificates , an example of which is given in
 Annex III , completed for each type of driver 's seat which they approve or
 refuse to approve .
                                    Article 5
 1 . If the Member State which has granted EEC component type-approval finds
     that a number of driver 's seats bearing the same EEC component type-
     approval mark do not conform to the type which it has approved , it shall
     take the necessary measures to ensure that production models conform to
     the approved type . The competent authorities of that State shall advise
     those of the other Member States of the measures taken , which may , where
     necessary , and in the event of systematic failure to conform , extend to
     withdrawal of EEC component type-approval . The said authorities shall
     take the same measures if they are informed by the competent authorities
     of another Member State of such failure to oonform .
 2 . The competent authorities of the Member States shall inform each other
     within one month of any withdrawal of EEC component type-approval , and
     of the reasons for suoh a measure .
                                   Article 6
All decisions taken pursuant to the provisions adopted in implementation
of this Directive to refuse or withdraw EEC oomponent type-approval for a
driver * s seat or prohibit the placing on the market or use thereof shall
set out in detail the reasons on which it is based. Such decisions shall
be notified to the party concerned , who shall at the same time be informed
of the remedies available to him under the laws in foroe in the Member
States and of the time limits allowed for the exercise of such remedies .
                                  Article 7
Ko Member State may refuse to grant EEC type-approval or national type-
approval of a tractor on grounds relating to its driver 's seat if this
bears the EEC component type–approval mark and is fitted in accordance
with the requirements laid down in Annex IV.
 ---pagebreak---                                      - 4 -
                                   Article 8
 No Member State may refuse or prohibit the sale , the registration , entry
 into service or use of a tractor on grounds relating to its driver 's seat
 if this bears the EEC component type-approval mark and if it is fitted in
 aocordanoe with the requirements set out in Annex IV.
                                   Article 9
1 , For the purpose of this Direotive , "agricultural or forestry tractors'1
    means any motor vehicle , fitted with wheels or endless tracks , having
    at least two axles , the main function of which lies in its tractive
    power and which is speoially designed to tow , push , oarry or power
    certain tools , machinery or trailers intended for agricultural or fo­
    restry use . It may be equipped to carry a load and passengers .
2. This Directive shall only    apply to tractorB as defined in paragraph 1
    above which are fitted with pneumatic tyres and whioh have two axles
    and a maximum design speed between 6 and 25 km/h.
                                   Artide 10
Any amendments neoessary to adjust the requirements of the Annexes to
take account of technical progress shall be adopted in accordance with
the prooedure laid down in Article 13 of           ■' Directive 74/150/ehX3 »
                                   Article 11
1 . Member States shall bring into force    the provisions necessary m
    order to comply with this Direotive within 18 months of its noti­
    fication and shall forthwith inform the Commission thereof.
                                                           • • •/ • • •
 ---pagebreak---                                      - 5 -
2 * Onoe this Directive has 'been notified , Member States shall also ensure that
    the Commission is informed, in sufficient time for it to submit its
    comments , of any draft laws , regulations or administrative provisions
    whioh they propose to adopt in the field covered by this Directive .
                                  Article 12
This Directive is addressed to the Member States .
 ---pagebreak---                         LIST OF ANNEXES
ANNEX I   DEFINITIONS
ANNEX II  CONSTRUCTION AND TEST SPECIFICATIONS - CONDITIONS FOR EEC
          TYPE-APPROVAL AND MARKING
          1.  General spécifications
          2.  Special requirements
              2.1 . Seat surface dimensions
              2.2 . Position and inclination of the backrest
              2.3 - Inclination of the seat surface
              2.4 . Seat adjustment
              2.5 . Seat testing
          3.  Condition for EEC type-approval and marking
              3.1 . Conditions for EEC type–approval of a seat
              3-2 . Application for EEC type-approval
              3.3 . Inscriptions
              3.4 . EEC type-approval
              3»5 * Marking
              Appendices 1-11
ANNEX III MODEL OF EEC TYPE-APPROVAL CERTIFICATE
ANNEX IV  SEAT INSTALLATION REQUIREMENTS FOR EEC TYPE-APPROVAL OF A
          TRACTOR
ANNEX V   ANNEX TO THE EEC TYPE-APPROVAL CERTIFICATE FOR A TRACTOR *
          THE DRIVER 'S SEAT
 ---pagebreak---                                        1 -               Annex I , p. 1
                                   ANNEX I
                          »
                                 DEFINITIONS
 For the purposes of this Directive :
 1.     "Driver 's seat " means the seating provision for the person
        driving the tractor .
 2.     "Seat surface " means the almost horizontal area of the seat
       which supports the driver when seated .
3.     "Backrest "   means the almost vertical area of the seat support­
       ing the driver 's back when seated .
k,     "Lateral seat supports " means the devices or forms of the seat
       surface that prevent the driver from sliding sideways .
4.1®   " Seat armrests " means the devices on either side of the seat
       which support the driver 's arms when he is seated .
5*     "Seat reference point " ( SRP ) means the point of intersection in
       the central longitudinal plane of the seat between the tangential
       plane at the base of the upholstered backrest and a horizontal
       place e This horizontal plane intersects the lower surface of
       the seat 150 mm in front of the seat reference point ( see Appen­
       dix 1 to Annex II ).
6.     "Depth of the seat surface " means the horizontal distance
      between the SPR and the front edge of the . seat surface .
7o     "Width of the seat surface " means the horizontal distance between
      the outside edges of the seat surface measured in a plane perpen­
      dicular to the central plane of the seat .
8.    "Load adjustment range " means the range between the two loads
      corresponding to the mean positions in the suspension system
      curves plotted for the heaviest and lightest driver .
                                                                   /.
 ---pagebreak---                                      - 2 -
                                                         Annex I , p. 2
9.   "Suspension travel " means the movement from the highest to the
     lowest position in the suspension system .
10 . "Vibration " means the vertical movement up and down of the driver 's
     seat .
11 . " Vibration acceleration   ( a )" means the second differential of the
     vibration displacement with respect to time .
12 . "R.m.s . value of the acceleration            means the square root of
     the meant square of the accelerations .
13 . "Spectral power density ( $ )" means the limiting value , when
       & b->o , of the square of the r.m.s . value measured after a
     filter of limited pass-band , divided by the band-width of the
     filter (6 b = width of filter ).
14 . "Weighted vibration acceleration (&w)" means the weighted vibration
     acceleration determined with the help of weighting filter in
     accordance with item 2.5.3.3.5.2 . of Annex II .
15 . " Vibration ratio " means the ratio of the weighted vibration
     acceleration measured on the driver 's seat to that measured at
     the point of seat attachment .
16 . " Vibration class " means the class or group of standard tractors
     which show the same vibration characteristics .
17 . " Standard tractors " means tractors whose characteristics enable
     them to be classified in one of the vibration classes because of
     similar constructional features .
                                                                   • •/ • •
 ---pagebreak---                                     - 3 -                 Annex I. P « 3
                                   V\
17.1 . The characteristics of these t>^ctors are as follows :
        Number of axles : two
                                           \Va,
                                                 'V
                                                   %.
        Load distribution :
        - front axle : 30 - 45 % of unladen weight y,
        - rear axle     : 70 - 55 % of unladen weight ;
                                                         \
                                                            Λ
        Tyres : front smaller than rear
                  ( ratio of tyre radii – 4:5 );
        Track width : smallest adjustable track width greater than
                         1150 mm ;
        Suspension : rear axle unsprung ;
        Horizontal position of seat : between rear axle and centre of
                                          gravity of tractor .
 17.2 . Tractors of standard design are subdivided into classes :
         Class I : 1,400 to 3»600 kg unladen weight
         Class II : 3*601 to 5t000 kg unladen weight .
 18 .    " Reference tractor " means a tractor whose vibration behaviour is
         specific for testing a seat for a vibration class .
 18.1 . The technical data for reference tractors must accord with the
        values shown in the table., below :
                                                           • •/ • •
 ---pagebreak---                                    - 4 -
                                                       Annex I , P. k
( *) These tolerances must not be exceeded unless it is shown that
     the spectral power density of the vertical acceleration at the
     point of seat attachment satisfies the conditions specified in
     Appendices 9 and 10 . of Annex II .
(*) These values are applicable to diagonal tyres ; if radials are
     used , the pressure must be increased by 15 % •
19 . " Non-standard tractor " means a tractor whose characteristics are such
       that it cannot be classified in any vibration class .
 ---pagebreak---                                    - 5 -                 Annex xl . P. 1
                                   ANNEX II
   CONSTRUCTION AND TEST SPECIFICATIONS - CONDITIONS FOR EEC TYPE
   APPROVAL AND MARKING
 1.      GENERAL SPECIFICATIONS
 1.1 .   The driver 's seat must be designed to ensure a comfortable
         position for the driver when controlling and manoeuvring the
          tractor , and to afford him the utmost protection as regards
         health and safety .
 1.2 .   The seat must be adjustable in the longitudinal direction and
         in the height without the use of a tool .
 1.3 .   The requirements under points 1.2 above do not however , apply
         if the seats are intended for installation in tractors with
         a minimum width between the rear wheel tracks of 1150 mm or
         less .
 1.4 .   The seat must be adjustable for persons of different weights .
         Where adjustment is necessary in order to comply with this
         requirement , it must be carried out without the use of tools .
 1.5 .   The seat must be designed to reduce shocks , and vibration .
         It must therefore be well sprung , have good vibration absorption
         and provide adequate support at the rear and sides .
        The lateral support is considered adequate if the seat is
        designed to prevent the driver 's body from slopping sideways .
1.6 .   The seat surface , the backrest , the lateral supports and the
        removable , folding or fixed armrests must be upholstered .
1.7 .   The seat reference point ( SRP ) must be determined in the
        manner specified in Appendix 1 of Annex II .
 ---pagebreak---                      - 6 -
                                           Annex II , P. 2
Save as otherwise provided , the measurements and tolerances
must comply with the following requirements :
The measurements given must be expressed in full units and
rounded off to the nearest whole number .
The instruments used for making measurements      must be enable
the measured value to be rounded off to the nearest whole
unit and must be accurate within the following tolerance
limits :
   for length                            : +  5 %
   for angle measurements                : +  1"
   for determination of tractor weight   : +  20 kg
   for measurement of tyre pressure      : +  0.1 bar
For all data relating to dimensions , a tolerance of + 5 %
is allowed .
Th« seat must undergo the following tests :
Determination of the suspension characteristics and the
range of adjustment to the driver 's weight .
Determination of lateral stability .
Determination of vibration .
The seat undergoing the above-mentioned tests must possess
the same characteristics with respect to construction and
fittings as the seats in series production .
All the tests must be carried out on the same seat in the
order specified in point 1*9 *
Before the tests are carried out , the seat must have been
run in by the manufacturer .
If the requirements specified for . one phase of the test are
not fulfilled , or if the test seat shows damage that might
affect its characteristics , the test must be terminated and
 the test report must state the test results obtained so iar
 and the reason for termination of the test .                 /
                                                         • • •/ • • •
 ---pagebreak---                                                            Annex II , p. 3
   1 . 14.  S «ats tested for Class I tractors are suitable only for
             tractors of that class , whereas seats tested for Class II
             tractors are suitable for Class I or Class II traotors .
   2.       SPECIAL REQUIREMENTS
   2.1 ,    Seat surface dimensions
   2.1*1 *  The depth of the seat surface , measured parallel to the lon­
            gitudinal median of the seat at a distance of 150 mm , must
            be 400 + 50 mm ( see Fig .    below ).
. 2.1 *2>*  The width of the seat surface , measured perpendicular to the
            median of the seat , 150 mm in front of the SRP and 80 mm
            above that point , must be at least       mm ( see Fig . below ).
  2.1.3 *   The depth and the width of the surface of seats intended for
            tractors in which the distance between the rear wheels does
            not exceed 1 150 mm may be reduced if it is technically im­
            possible to comply with the specifications in items 2.1.1 .
            and 2.1.2 . above , namely , 300 mm for the depth and 400 mm
            for the width .
  2.2 *     Position and inclination of the backrest
  2.2.1 *   The upper edge of the backrest of the seat must be at least
            260 mm above the SRP ( see Fig . below ).
  2.2.2 *   The backrest must have an inclination of 10° + 5° ( see illus­
            tration below ).
  2.3 *     Inclination of the 6eat surface
  2.3*1 *  The inclination towards the rear 0t ( see figure below ) of
           the surface of the loaded cushion must be 3-12° in relation
           to the horizontal , measured with the loading device in ac­
           cordance with Appendix 1 .
 2.3.2 .   The choice of the angle of inclination within this category
           shall depend on the seated position .
 ---pagebreak---                                  - 8 -                        Annex II , P. L.
2.k .   Seat adjustment
        The seat must be adjustable in the longitudinal direction
        by a distance of 150 mm ( see figure below ).
2.^.2 . The seat must be adjustable in the vertical direction by a
        distance of 60 mm ( see figure below ).
                             - Figure -
                                    10 -t r-o
                                                  j min* adjustment of + 30 mm
                                                 SIîP
                                              min. adjustment of + 75     mm
                           • 150
               ^_r;j
             \- ^ n\
                o                , l\      I <5
                  '            J/ / *
                    400 ±50           \       «t
                                              SRP
2.5 .   Seat tests
2.5*1 * Test to determine the suspension characteristics and_the
        range of adjustment to the driver 's weight
 ---pagebreak---                                     - 9 -                Annex II , P. 5
 2.5.1.1 *     The suspension system characteristics shall be determined
                by a static test . This must be carried out with the seat
                adjusted to accomodate a driver weighing 50 kg and one
               weighing 120 kg .
               The maximum and minimum values limiting the range through
               which the seat is adjustable to the driver 's weight shall
                be calculated from the suspension system characteristics .
 2*5*1 * 2 .   The seat shall be mounted on a test stand and a load applied
                to it , either directly or by means of a special device ; the
               load applied to the seat shalil not differ by more than 5 N
               from the nominal load . The depression of the suspension
               system shall be measured with an accuracy of not less than
               + 1 mm *
 2.5*1 *5 *    A complete characteristic curve representing the deflection
               of the suspension systea shall be plotted from zero load
               to maximum load , and back to zero *
               The load graduations at which the depression of the sus­
               pension system is measured shall not be greater than 100 N ;
               at least eight measurements points shall be plotted at
               roughly equal intervals in the movement of the suspension
               system * The point taken as the maximum load shall be either
               that at which no further spring depression can be recorded *
               or load of 1,500 N * After the load has been applied or
               withdrawn , the vertical depression of the suspension sys­
               tem shall be measured 200 mm in front of the seat reference
              point ; sufficient time shall be allowed after the applica­
               tion or removal of the load to ensure that the seat is at
              rest *
2.5*1.4 *     In the case of seats without fixed weight adjustment limits ,
              the settings shall be so selected that :
2«5«1 . 4.1 * for the lightest driver , the seat returns to the top of the
              suspension travel when the load is removed ; and
                                                                      • 9 0/• • •
 ---pagebreak---                                         - 10-                Annex II , p. 6
 2.5*1 •^• 2 .    for the heaviest driver , the load of 1 500 N just depresses
                  the seat to the lowest limit of the suspension travel ,
                  the range of weights thus determined shall then be deemed
                  greater than the range measured .
             3 * if the seat is equipped with a progressive lower spring
                 stop , the lowest position of the suspension travel ( see
                 Annex I , item 9 ) ®ay he defined as the position which the
                 seat assumes under a load of 1 000 N , in the setting for
                 the lightest driver .
 2.5*1 • 5 »      The mean position of the suspension system is the position
                  which the seat assumes when it is depressed by half the
                  full travel of the suspension system .
 2.5 • 1.6 .      Since the characteristic curves of the suspension system
                  are generally hysteresis loops , the load must be determined
                  by drawing a centre line through the loop ( see Annex I , it^m 8
                  and items A and B in Appendix 2 of Annex II. )
2.5o1o7o         To determine the limits of the adjustment range as a func­
                 tion of the driver 's weight , the values of points A and B
                 ( see Appendix 2 ) established in accordance with item
                 2.5.1 . 6 . must be multiplied by 1 . 5 .
2.5.2 .          Test to determine_the_lateral_stabilitjr
2.5.2.1 .        The seat shall be set for the maximum permissible driver 's
                 weight and connected to the test stand in such a way that
                 its base plate rests on a fixed plate ( test 6tand ) not
                 smaller than the base plate itself .
2.5 . 2*2 .      A test load of 1 000 N shall be applied to the surface or
                 cushion of the seat . The point of application shall lie
                 200 mm in front of the seat reference point and alternately
                 on the two sides 150 mm from the plane of symetry through
                  the seat *
                                                                      • • •/ •••
 ---pagebreak---                                   - 11 -               Annex II - p. 7
2.5«2c3 «    During application of the load , the variation in the late­
             ral angle of inclination of the seat surface shall be
             measured and recorded in the end settings for horizontal
             and vertical seat adjustment . A permanent deformation close
             to the point of application of the load shall not be taken
             into consideration .
2.5.3 .      Test to determine the vibration_
             The seat vibration is determined by tests on a standard
             roadway and/or test stand depending on the type of tractor
             for which it is intended .
2.5          Testing on a standard roadway
             The roadway consists of two parallel strips spaced according
             to the wheeltrack of the tractor . The surface may be cast
             in smoolthly surfaced concrete , or it may be formed of wood
             or concrete blocks set in a basic structure .  The surface
             of each track strip i6 defined by the ordinates of eleva­
             tion in relation to a base line ; these ordinates are shown
             in the tables in Appendix 3 » With regard to the roadway ,
             the elevation is defined at intervals of 16 cm along each
             strip .
             The roadway must be firmly set in the ground and the dis­
             tance between the strips must deviate only slightly over
             its entire length ; the tractors wheels must be fully sup­
             ported at all times . Where the strips are formed of blocks ,
             these must be 6-8 cm thick and arranged at intervals of
             16 cm .
             The total length of the track shall be 100 m .
2*5<>3*1e2 « The vertical vibrations transmitted shall be determined at
             a speed of 12 + 0<>5 km/h . The prescribed speed must be
             maintained without the use of brakes .  The vibrations
             shall be me&sured on the seat ( with a light and a heavy
             driver ) and at the point where the seat is attached to
             the tractor .
 ---pagebreak---                                     - 12 -
                                                           Annex II . , p. 8
               Th « speed of 12 km/h must be reached after a run-up track
               has been traversed . The surface of this run-up track must
               be flat and must join the test track without any change in
               level .
 2.5.3.1 . 3 . The seat must be set for the driver 's weight in accordance
               with the maker 's instructions .
 2.5.3.1 .^. The tractor must be fitted with a protective frame and/or
               cab save where this equipment is not required . It must not
               carry any ancillary equipment . Moreover , there must be no
               ballast on the wheels ot framework , and no fluid in the ty­
               res *
2.5.3.1.5 . The tyres used during the test must have the standard
               dimensions and ply-rating , as specified in the manufacturer 's
               instructions . The depth of the tread must not be less than
               65 % of the depth of a new tread .
2«5*3*1«6 * The side-walls of the tyres must not be damaged * The inter*
               nal pressure of the tyre must correspond to the arithmeti­
               cal mean of the reference pressures recommended by the
               tyre manufacturer . The wheel track must correspond to that
               used under normal working conditions for the tractor model
               on which the seat is fitted .
2.5*3*1 * 7 * The measurements at the point of seat attachment and on the
               seat itself may be made during the same run or on separate
               runs .
               For measuring and recording the vibrations , an accelerometer ,
               a measuring amplifier and a magnetic tape recorder or direct-
               reading vibration meter shall be used . The specifications
               for these instruments are laid down in points 2*5*3«3.2 . to
               2 .5*3.3.6 .
2.5*3.2 .      Testing on the test stand
2.5.3.2.1 . The test stand must simulate the vertical       vibrations at
               th'3 point of attachment of the driver 's seat . The vibrations
               are generated by means of an electro-hydraulic device . The
                set values are either those specified in Appendices k and 5
                                                                  for the        /
                                                                             • •/ • •
 ---pagebreak---                                      - 13 -               Annex II , p. 9
              class of tractor in question , or the double-integrating acce­
              leration signals recorded at the seat attachment of a non­
              standard tractor moving at a speed of 12 + 0.5 km/h on a
              standard roadway as defined in point 2.5*3«1*1 *  The vibra­
              tions must be transmitted to a platform which roughly corres­
              ponds in its dimensions to the driver 's cab of a tractor .
              To generate the vibrations , an uninterrupted double run of the
              seat values or the double-integrating acceleration signals
             must be used , recorded at the seat attachment of a non-stan­
              dard tractor type moving on standard track . The measurements
             must not be made during the first run of the set values or of
              the acceleration signal .
2»5 »3*2.2 Besides an attachment for the test seat , the platform must
              contain a steering wheel and footrest . Its configuration must
              be as shown in Appendix 6 .
2.5 *3 * 2.3 The test stand must have a high degree of flexural and tor­
              sional rigidity , and its bearings and guides must have no
             more than the technically necessary clearance . If the plat­
              form is carried on a vibrating arm , the dimension R must be
             at least 2,000 mm ( see Appendix 6 ).
             The test stand must be able to simulate sinusoidal vibrations ,
             as shown in Appendix 7 » when a weight of 150 kg is applied .
2.5 « 3«3 -  Specifications for tests on roadway and test stand
2.5.3 . 3.1 Driver's weight
             The tests must be carried out with two drivers : one with a
             total weight of 55 kg + 10 # , of which not more than 5 kg
             may be carried in a weighting belt around the body ; the other
             weighing of 98 (+ 10 % ) , with a maximum weight of 8 kg in
             the belt .
                                                                    • • •/• • •
 ---pagebreak---                                                               Annex II , p. 10
-2.5*3o3 o2 »       Position of the accelerometer
                    To measure the vibrations transmitted to the driver , an
                    accelerometer shall be placed on a rigid and flat plate
                    with a diameter of 250 mm + 50 nui , the central part of
                    which must be rigid up to a diameter of 75 mm and must
                    include a rigid protective device to protect the accele­
                    rometer . This plate must be placed in the middle of the
                    seat surface between the seat and the driver and have a
                    foam rubber covering about 20 mm thick ,,
                    To measure the vibrations of the seat attachment , an ac­
                    celerometer must be placed on this attachment at a point
                    not more than 100 mm from the longitudinal median plane
                    of the tractor and not outside the vertical projection
                    of the seat surface on the tractor .
2.5.3.3.3 .         Measurement of vibration acceleration
                    The accelerometer and the associated amplifying and trans­
                    mitting equipment must respond to vibrations with an
                                              2    . .        ...
                    r.m.s . value of 0.05 n/s • and be capable of measuring
                                                                2
                    vibrations with an r.m.s . value of 5 m/s     and a crest
                     factor ( ratio of peak to r.m.s . value ) of 3 without
                     distorsion and with a maximum error of 2.5 • % over the
                     range 1-80 Hz .
 2.5 « 3-3 » 1**     Magnetic tape recorder
                     If a tape recorder is used , it must have a maximum repro­
                     duction error of + 3«5»% in frequency range of 1-80 Hz ,
                      including change of tape speed during replay for analysis .
  2 . 5*3«3*5 *       Vibration meter
  2.5 »3 »3 »5 *1 •   Vibrations of more than 10 Hz may be disregarded . It is
                      therefore permissible to connect upstream of the measu­
                      ring instrument a low-pass filter with a cut-out frequency
                      of about 10 Hz and an attenuation of 12 dB per octave .
                                                                         • • •/ • • •
 ---pagebreak---                                    - 15-               Annex II , p. 11
2.5.3.3.5.2 . This instrument must incorporate an electronic weighting
              filter between the sensor and the integrator stage .
              The filter must correspond to the curve shown in Appendix
              8 and the margin of error mu6t be + 0.5 dB in the 2-4 Hz
              frequency band and + 2 dB for the other frequencies .
2.5.3.3.5.3 . The integrator stage must be capable of indicating either
              - the integral of the square of the weighted vibration
                acceleration (a ) for a test time T
                             JL
                                aw 4 1
                           S
              - or the square root of that integral , except where it
                directly indicates the r.m.s . value of the weighted
                vibration acceleration (a
                      a
                        weff
                                  γΐ/ τ =
                                            /r
              The overall inaccuracy in the r.m.s . value of the weighted
              acceleration calculated in this way must be within + 5
2.5.3«3.6 .   Calibration
              All instruments must be regularly calibrated .
2.5.3*3*7 .   Evaluation of vibration tests
2.5»3*3*7*1 * During each test , the weighted vibration acceleration for
              the whole test time shall be determined with the direct-
              reading vibration meter specified in point 2.5*3*3.5 .
2.5.3.3.7.2 . In addition to the pairs of mean values relating to the
              vibration of the tractor or the seat , the test report
              shall also contain the ratio of the weighted vibration
              acceleration on the driver 's seat to that measured at the
              seat attachment .    This ratio shall be given to two deci­
              mal points .
                                                            • • •/ • • •
 ---pagebreak---                                 - 16 -                  Annex II , p. 12
2.5.3.3.7.3 . The range of ambient temperature during the tests shall
              be measured and shown in the report .
2.5.4®        Tests to be carried_out_on_tractor_seats_degervding_on_the
              intended_use
2.5 . 4.1 .   A seat intended for use on a standard tractor must be
              tested either on a standard roadway with the aid of a
              reference tractor appropriate to the class of the
              standard tractor in question or on a vibration test
              stand using the appropriate set value signals .
              If the test of a seat intended for use in a standard
              tractor is carried out on a standard roadway with a re­
              ference tractor , the test is valid for the entire tractor
              class . If , however , the test is carried out with the
              tractor for which the seat is intended , it is valid only
              for that particular combination of seat and tractor .
2®5 e 4.2 .   A seat intended for use on a non-standard tractor must
              be tested on a standard roadway with the tractor on which
               it is to be used . However , a simulation test may also
               be carried out using a set value signal corresponding
               to the acceleration curve which was determined during
               the test on standard roadway with the tractor for which
               the seat is intended .
 2.5.4.3 .     A seat intended for use only on a particular standard
               tractor may also be tested in accordance with the requi­
               rements under point 2.5.4.2 . above ; in this case , type
               approval will be granted only for the tractor for which
               the test seat is intended .
 2.5 .5 .      Special reguirement6 _for_seat _vibrat ion_tests_on_standard
               tractors
 2.5.5.1 .     The vibration behaviour of the reference tractor , which
               is the critical factor in the test on the driver 's seat ,
               is defined by the spectral power density of the vertical
               acceleration ( Appendices 9 and 1Q ) recorded at the
                                                                _    • • •/ • • •
 ---pagebreak---                                          - 17 -               Annex II , p. 13
            seat attachment of the reference tractor during a run on the
            standard roadway in accordance with the provisions of point
            2.5.3.1 .
2.5«5*2.The weighted acceleration measured at the seat attachment
            during the test run of the reference tractor must lie within
            the following ranges :
            For Class I reference tractors :
                    awB = 1*9           ..... 2.2 m/s
            For Class II reference tractors :
                    a wBn » 1.6               1.8 m/s
            The value awfi actually present at the seat attachment during the
           measurement         run must be determined .   In case of deviation
            from the reference value of :
                                      2
                    a*g = 2.05 m/s        for Class I
                    «* - 19 m /fi2 f0r Cla6S lr»
                    a^g   - 1 ." o/s
            the acceleration of a         measured on the driver 's seat must be
                                      ws
            corrected in accordance with the relation :
                                    a*
                                      wB
                           sa     x
                      ws       ws   a   _
                                      wB
2.5 *5 »3 * In each phase of the standard roadway test , at least two
            measurement runs must be carried out .       The measured values
            must not deviate from the arithmetic mean by more than + 5
2.5 >5 •^• In the case of the test carried out on the stand , the set value
            signals for the generation of the vertical movement of the seat
           attachment must have been determined by double integration of
            the acceleration signals recorded at the seat attachment of
           Class I or II reference tractors during a run on the standard
           roadway . They are given in Appendices k and 5-
           The test stand must be so adjusted that the seat attachment is
           subjected to a weighted acceleration of :
                      a - = 1.9                 2.2 m/s                           .
                                                                        „ . • • •/ • • •
 ---pagebreak---                                      - 18-
                                                          Annex II , p. 1 if
            for Class I standard tractors , and
             a^g = 1.6 . ........... 1.8 m/s^
            for Class II standard tractors
            The value a^g actually present at the seat attachment during
            measurement       must be determined .   In cast of deviation
            from the reference value of :
             a* g a 2.05 m/s^ for Class
             a* _ a 2.05 m/s            Class I standard tractors
                                2
                wB   = 1.7 m/s     for Class II standard tractors ,
             the acceleration of a        measured at the driver 's seat must
                                      ws
             be corrected in accordance with the following equation :
                           a*
                            wB
             a  _  a  a
               wB       ws
                            wB
2.5.5.5 .    For the test on the stand , the requiremeats under point
             2.5.3*2 . are applicable , and the vibration must be gene­
             rated in accordance with the requirements under point
             2.5.5.2 .
             For each of the two drivers referred to in points 2.5.3«3>1>t
             the weighted vibration acceleration must be measured at the
             seat over a period of 28 seconds .      At least two test runs
             must be carried out .      The measured values must not deviate
             from the arithmetic mean by more than + 5 % •
2.5.6 .      Sgecial requirements for vibration tests on seats o^_222l
             standard tractors
2.5-6.1 .    In accordance with the requirements under point 2.5*^.2 .,
             the seat vibration tests are not applicable to a group or
             class of tractors , but each tractor type for which the
             seat is intended .
2 . 5.6.2 .  The test on standard track must be carried out in accor­
             dance with the requirements under items 2.5»3«1 « and
             2.5.3.3 . In this case , the vibratory acceleration measured
             on the driver 's seat (a      ) need not be corrected and is
                                                                   *
             accordingly identical with the reference value a         «
 ---pagebreak---                                            19 -              Annex II , p. 15
 2.5.6.3.   The -testing on the test stand must be carried out in association
            with a test on standard track in accordance with the requirements
            of points 2.5 . 3 « 2« and 2.5 * 3 * 3 *
            The set points for vibration rig drive unit shall "be determined
            by double integration of the vibratory movement acceleration
            signal reoorded in accordance with point 2.5*3*2.1 .
 2.5«6.4 ,  In the determination of the set values obtained in accordance
            with the provisions of 2.5*6.3 . above , the weighted vibration
            acceleration (A        ) recorded on the test stand at the seat
                                wp
            attachment must not deviate by more than + 10 % from the
            value (&wp) recorded on the standard roadway in accordance
           with the requirements under 2.5.6.3 . above .       In the event of
            deviation from the value (A wFJ) measured at the seat attach-
           ment during the test run , the wexghted vibration accelera­
            tion recorded at the driver 's seat during the test on the
            test stand must be corrected as follows :
                         a*      »   a     x     awF -o
                          ws           ws
                                                 a
                                                   wp
           Each of the tests on the test stand must be carried out twice «
           The measured values must not deviate by more than + 5 % from
            the arithmetic mean .
3. '       PROVISIONS RELATING TO EEC TYPE-APPROVAL AND MARKING
3.1 *      Conditions for EEC type-approval of a seat
           In order to qualify for EEC type-approval , a seat must , in
           addition to fulfilling the requirements set out above , satisfy
           the following conditions :
3• 1 • 1 o The maximum range of adjustment for the driver 's weight must
           extend from at least 50 to 120 kg .
3 « 1«2 «  The change in the angle of inclination measured during the
           lateral stability test must not exceed 5° ,
                                                                         •/ •
 ---pagebreak---                                       - 20 -                 Annex II , p. 16
 3.1.3 *     The corrected measured value of the weighted vibration acce-
             leration (aW*6 x) must, not exceed. 1.25 o/s
                                                        .2
                                                           . None of the
             measurements must deviate from the arithmetic mean by more
             than + 5 % •
 3.2 .       Application for EEC type-approval
 3.2.1 .     The application for EEC type-approval shall be submitted by
             the owner of the trademark or by his authorized representative .
3.2.2 .     For each type of driver 's seat , the application shall be
             accompanied by :
3.2.2 0 1 . a brief technical description , stating in particular the
            tractor or tractors for which it is intended ,
3.2 0 2.2o  drawings in triplicate , sufficiently detailed to permit
            identification of the type of seat and showing in particular
            its dimensions , its weight , its suspension system and its
            means of attachment ,
3.2.2.3 .   at least one seat ,
3.2\ Zmk 0  one tractor ( if necessary ) representative of the type of
            tractor for which the seat is intended .
3»3o        Inscriptions
3*3*1 •     The seat submitted for EEC type-approval must bear the
            applicant 's trademark , clearly and indelibly inscribed .
3 . 3.2 .   On each seat /there must be an area large enough for the EEC
            type-approval mark ; this area must be shown on the drawings
            referred to in point 3*2.2.2 . above .
3.4 .       EEC type-approval
3.^.1 •     If the seat submitted in accordance with the provisions of
            point 3*2 . complies with the requirements of points 3*1 .
            and 3*3 * » EEC type-approval will be granted and a type-ap-
            proval number allocated .
3*4.2o      This number must not be allocated to any other type of seat Q
                                                                         ./ .
 ---pagebreak---                                 - 21 -                 Annex II , p. 17
 3.5 «    Marking
 3*5«1 «  Every seat that conforms to a type approved m pursuance of
          this Directive must bear an EEC type-approval mark .
          The type-approval mark shall consist of a rectangle , within
          which shall be placed the letter " e " followed by the distin­
          guishing number or letter of the Member State which has
          granted type- approval :
         an EEC type-approval number corresponding to the number of
         the EEC approval certificate issued for the type of seat ,
         below and close to the rectangle and the mark , and , above
         and close to the rectangle ,- the type of tractor of standard
         model for which the seat is intended .    This mark shall be x
         For Category I standard model tractors : I
         For Category II standard model tractors : II
         For Categories I and II standard model tractors g I & II .
         If no mark is shown above the rectangle , this means that the
         seat is intended for a non-standard model tractor .
3»5*3 «  The EEC type-approval mark shall be affixed to the seat in
         such a way that it is indelible and clearly legible even
         when the seat is mounted on the tractor .
3*5 «^»  An example of the type-approval mark is given in Appendix 11 «
                                                                   •/O
 ---pagebreak---                      - 22 -               Annex 11 . p , 15
The dimensions of the various components of this mark shall
not be smaller than the minimum dimensions specified for
marking as illustrated in Appendix 11 .
 ---pagebreak---                                   - 23 -                   Annex II
                                                           Appendix 1 , p. 1
             METHOD OF DETERMINING THE SEAT REFERENCE POINT
1 . DEFINITION OF THE REFERENCE POINT
    The reference point is defined as the point in the median longitu­
    dinal plane of the seat where the plane tangential to the lower
    part of the padded backrest and a horizontal plane intersect . This
    horizontal plane cuts the lower surface of the seat-pan board
    150 mm in front of the seat reference point#
2 . DEVICE FOR DETERMINING THE SEAT REFERENCE POINT
    The device ( Figure 1 ) should consist of a seat-pan board and the
    components of a padded backrest .      The lower part of the padded
    backrest shall be jointed in the region of the ischium humps ( A)
    and the loin ( B ) f the joint ( B ) being adjustable in height .
3 . METHOD OF DETERMINING THE SEAT REFERENCE POINT
    The 6eat reference point shall be obtained by using the device il­
    lustrated in Figures 1 and 2 , which simulated loading by a human
    occupant . The device shall be positioned on the seat . It shall
    then be loaded with a force of 550 N at a point 50 mm in front of
    joint ( A ) and two parts of the padded backrest lightly pressed
    tangentially against the padded backrest .
    If it is not possible to determine definite tangents to each area
    of the padded backrest ( below and above the lumbar region ) the
    following procedure 6hall be adopted :
    a) No definite tangent to the lower area possible :
       The lower part of the padded backrest board in a vertical posi­
       tion shall be lightly pressed against the backrest .
 ---pagebreak---                           - 24 -                Annex II
                                                Appendix I. p. 2
No definite tangent to the upper area possible s
The Joint ( B ) shall be fixed at a height of 230 mm above the
seat reference point if the lower part of the padded backrest
board is vertical .   Then the two parts of the padded backrest
board in a vertical position shall be lightly pressed against
the padded backrest .
 ---pagebreak---                                                                                              k
                                    - 25 -                                 Annex XI
                                    FIGURE 1                               Appendix 1 , p. 3
        Devioe for determining the seat reference point
                                                        r
                                                         [o
                                                         –ΙΒB
                                                                 m
                                                                              10
                                                                              u
                                                                              φ
                                                                             4»
                                                                              α>
                                                                              3
»le.               •     '                     AS** M              ts
   *                                      A           X/ I
      I                                        200
                                                                              m
                                                                              G
                                                             , 20             o
                                                                             •H
 !                                   I                                        a
                                                                              C
                                                                              a>
                                                                              S              α.'
                                                                             δ
   in
   *     -1
                Q
                -1-H
                     I     "–- of–     \
                               £51 –1 I y
                                            L sAl |
                                            n
                                            II
                                                     I–       o o
                                                        1–I-ol ro
                     ^ rrr
        . I                460
                                                  150
                                    FIGURE 2
                             Device in position
                                                    Π8 Ί        Γ
                            " lj°j 150 ,                          Seat reference point
 ---pagebreak---                                     - 26 -                  Annex II
                                                            Appendix 2 , p. 1
                                 Annex II
TEST TO DETERMINE THE CHARACTERISTICS OF THE SUSPENSION SYSTEM
Hysteresis curves to determine the maximum adjustment range
( point 2.5.1 .)
          /
          ]
   140|-  j
          j                                                              Maximum
    j                                                                  /fdefleotion
   120 -                                                      /
   100                  ..
              /     load                                / /            '
     60f~ j        range                               / /
    4/ J.
        i                                          '             1 i
                                                                    s
                                                                     !
                            .//         ®    c                   i .
                           / ,/        "à    o
    2°f            //                  J S   ta                     i
                                       *d .. o
                A-                     S     P,
       Ι'7'
       J»   /
                                       "             '         ;
                                                                   :
                                                                   .
       j/             {         _ .                       _ M
                     20           40            60     80     100
                                     DEFLECTION . ma
 ---pagebreak---                                 - ?                 Annex II
                                                    Appendix 3 , p.
TEST ON STANDARD ROADWAY - TABLE OF ELEVATION ORDINATES IN RELATION
TO AN ARBITRARY BASIC LEVEL DEFINING THE SURFACE OF EACH STRIP OF
                 THE ROADWAY ( POINT 2.5.3.1.1 .)
D a distance from starting point ( metres )
L  a  ordinate of the left-hand strip ( mm )
H  a  ordinate of the right-hana strip ( mm )
 ---pagebreak---  ---pagebreak--- – 29 – Annex' II
       Appendix  3 , p. 3
 ---pagebreak---                                - 30 -                   Annex II
                                                        Appendix     p. 1
Set-value signals for the test-stand testing of driver 's seats for
Class I standard tractors ( point 2»5«3»2»1 «)
PS ■ set point
                                                   ..i+
a   * amplitude of the required value signal in 10      m,
t   ■ measurement time in seconds
These signals are shown in the table for 700 required points#
They can be stored numerically and , after passing through a low-pass
filter with a cut-off frequency of about 10 Hz and high-frequency
attenuation of 12 dB/octave , they show the amplitude of the set value
for the electro-hydraulically controlled test stand .      The set-value
signals must be repeated without interruption *
 ---pagebreak--- - 31 - Annex  II
       Appendix U , p. 2
 ---pagebreak---        Annex  II
- 52 -
       Appendix U , p. 3
 ---pagebreak--- *2 - Annex  II
     Appendix k , p. ^
 ---pagebreak---                                  - 3^ -                Annex II
                                                       Appendix 5 . p. 1
                                ANNEX II
Set-value signals for the test stand inspection of driver 's seats for
Class II standard tractors ( point 2.3*3*2 . 1 .).
PS   ■ set point
a    ■ amplitude of the required value signal in 10   m
t    ■ measurement time in seconds
These signals sure shown in the table for 700 set points .
They can be stored numerically and , after passing through a low-pass
filter with a cut-off frequency of abour 10 Hz and high-frequency
attenuation of 12 dB/ octave , they show the amplitude of the set value
for the electro-hydraulically controlled test stand .   The set-value
signals must be repeated without interruption .
 ---pagebreak--- 25 -
     Annex  II
     Appendix  5 , p. 2
 ---pagebreak---       - 36 -
             Annex  II
             Appendix  5 > P« 3
  PS
 No .
 257
258
259
260
261
262
263
264
265
266
2G7
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289.
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
303
309
310
311
312
313
314
315
316
317
318
319
320
 ---pagebreak--- 37 - Annex  II
     Appendix 5 , Ρ· *
 ---pagebreak---                                                   - 38 -
                                                 A' 3752 X   II
                                                                          Annex     II
           TEST STAND
            (point 2.5»3«2 .)                                             Appendix 6
                                                                              Dimension in mm
                                                           625 ± 50
                                                                                                  <4
                                                                                                 t 20
             Profile                                                        |
                                *■             ,                          '0°Ï 5»                205
                                                                                                 235
                                                                                                 305      1 V
                                                                                                 32 'j    f
                                                                                                 315      f..5
                                                                                                 3G5       ? V­
                                /o                                       / L/\I                  38b
                                                                                                 405
                              /•                     •                  RM
                                                                                                          i . ,
                                                                                                 « 25      7 .-.:.
                                                                                                 4<5
                            A      J          ^.AZTCVTTZ^TTTXÆ.                        lif       < 65
                                                                                                 185
                                                                                       j adjustmènt"
          point                                  <                      • j ^- Seatref
                                                                                     Seat reference point
                                                                                                       ( SRP )
    Z-t                 ^
                •–––| • 1 "ï         1    i
                                                   ,,
                                                   y.––... i
                                                                        –Ij–t» âdjustment
                                                                                  +y 75 min.
    ^7*"            "                   •                  ■ *•.' ■ . . £?i–jj
             '           î                                                 | °|CNI
                          |               '°OO
                          t–                        –~–
                         j                                  S;;;;//;;/À
                                                                                 Seat referenoe point ( SRP )
      Plan               j                                                     ^Seat refera
                    ■1                                    \
                     si
                     " en W
                                 \\         Vvw/I //                      /il /
                                                                         /ii •/
1 ) The angle of the steering column in relation to the vertical depends on the position of the
    seat , the diameter of the steering wheel .
2) The rearward inclination of the surfaoe of the fitted seat cushion must "be 3® -12° in relatio-
    to the horizontal when measured with the loading device in accordance with Appendix 1 . The
    ohoice of the angle of inclination within this olass depends of the position when seated.
 ---pagebreak---             «. 39 -                    Annex II
                                       Appendix 7
    TRAVEL OF THE VIBRATION TEST STAND
              ( point
–r–
M
M         1
                                  -v-:-
                                 10                        100
                                                  Frvqoency, Hz
 ---pagebreak---                                         - ko -                   Annex II
                                                                 Appendix ô
                CHARACTERISTIC OF THE FILTER OF THE VIBRATION MEASURING
                INSTRUMENT ( Point 2 . 5.3.3.5 .)
 £
«A
        ® 24 1
         •
                       r                          ,
                                                    1
«•.M
 +*     M
  9     O
        g 21                                                             :
f °-1 !                                                                  /
f                            :     1         :
I                                .                                 /
           15                       1      !                   /7^
    «4                 Γ           Γ~Τ                    7
            0          !                –           ,    y;:
    "•4       r        i                                /
                                                      /
    i.o     o          1 .                     £      \––\
              1        2           4           8     16               64
                                                                           Frequencv , Hz
                                          \
            \
              \
                                                             f
 ---pagebreak---                                   - H1 -               Annex II
                                                       Appendix 9 . p. 1
Spectral power density of the vertical vibration acceleration at the
seat attachment of the Clasa I reference tractor ( point 2.5*5 *)
The speotral power density of the vertical vibration acceleration at
the seat attachment of the Class I reference tractor can be approxi­
mately expressed by the following relation t
               i                  (f "
              AT * ATmax expr -      -.2g
where the constants have the values t
              4       « 6.0 ( m/s ) /Hz
               1 max
              f       - 3*25 Hz
                 η
             b        - 0.33 Hz
The permitted tolerances are t
              h       m + 10 %
              [ max     -
              f       - +  5 %
                 m      »
The tolerance with respect to b is determined by the fact that , in
acoordance with point 2,5,5*2 , , the weighted vibration acceleration
at the seat attachment must be within the limits s
             a_     ■ 1.9 ••••• 2.2 m/s
                                h
 ---pagebreak---                                     - k2 -                     Annex II
                                                               Appendix 9 * P * 2
                           SPECTRAL POWER DENSITY è ( f )
        Approximate function for the spectral power density of the vertical vibration
        acceleration at the seat attachment of the reference tractor for olass !•
  χ 7Ι                     –ι              1        :   1        1
S     I                  .    !•
•β
•s      max. 6                ,
S ""
5
S
                              i
                              1
                                        7iT~ .
                                             / • \
                                           i/–i–A                                  i
    4                                    1            1
   j–i– y 1 1–_L
      0         1             2           3             4        5                 6
                                              3.25 fm
                                                                     Frequency f, Hz
         \
           \
             Λ
                                                          /
 ---pagebreak---                                        - 43 -          Annex II
                                                       Appendix 10 . p « 1
Spectral power density of the vertical vibration acceleration at the
seat attachment of the ClasB II reference tractor ( point 2.5«5 »)
The speotral power density of the vertical vibration acceleration at
the seat attachment of the Class II reference tractor can be approxi­
mately described by the following relation :
                                           (f - f ) 2
                   4 - 4mavexp                   -5–
where the constants have the values :
                   A1 S16LX =    5*5 ( m/s 2 N) 2/Hz
                   f         -  2.65 Ha
                      m
                  b          «  0.3 Hz
The permitted tolerances are :
                  iTmax      *  +- 10 %
                   f         «   +  5 %
                      m          -
The tolerance with respect to b is determined by the fact that , in
accordance with point 2.5*5*2 ., the weighted vibration acceleration
at the seat attachment must be within the limits :
                                                     p
                  a        ■   1*6          1.8 m/s
 ---pagebreak---                               - kk -                    Annex II
                                                        Appendix 10 , p. 2
                   SPECTRAL POWER DENSITY   è   ( f)
Approximate function for the apeotral power density of the vertical vibration
acceleration at the seat attaohment of the reference tractor for class 2.
                                                                  Frequency f, Hz
 ---pagebreak---                                 - k5 -
                                                     Annex   II
                                                     Appendix   11
               EXAMPLE OF AN EEC TYPE-APPROVAL MARK
                     ( see point 3-5 - )
                                             ! a ZTs. 15 Eim
                                             1    II
                        i'- 1              a
                        1                  ?
                      El_3.                i
      i
                 1                      I               ?
          <                             •>
                                  g"""T
                ' ffv\ if\k fl|
                              vy r*èJ
 The seat bearing the EEC type-approval mark above is a seat approved
in Germany under number 1005 .
 ---pagebreak---                                      - 4o -                   Annex III , page 1
                                    ANNEX III
                MODEL POR AN EEC COMPONENT TYPE-APPROVAL CERTIFICATE
                                                             Name of the
                                                         competent authority
 Notification concerning the grant , refusal , withdrawal or extension of EEC
 component type-approval for a type of driver 's seat for a wheeled agricultural
 or forestry tractor#
 EEC component type–approvai No •••••••••••••••••••••••••••
 1*  Trademark of seat ••••••••••••••••••••••••••••••••••••••••••••••••••••••
 2*  Name and address of seat manufacturer ••••••••••••••••••••••••••••••••••
 3*  If applicable , name and address of manufacturer 's authorized represen­
     tative •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
4* Mark, type and trade name of traotor(s ) for which seat is intended (*)
5«   Submitted for EEC oomponent type-approval on •••••••••••••••••••••••••••
6,   Test laboratoxy ••••••••••••••••••••••••••••••••••••••••••••••••••••••••
7*   Date and number of laboratory report •••••••••••••••••••••••••••••••••••
 8. Date on which EEC type-approval was granted/refused/withdrawn (**)
9*   Place ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
10» Date
11 , A note describing the seat , particularly the amplitude of adjustment ,
     the total weight , the suspension system characteristics , type and
     thickness of upholstery and directions for attachment , is attached to
     this oertifioate * Designs of the sides of the seat in DIN A4 form with
     a lateral and frontal view are enolosed this note *
12« Remarks ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
13» Signature ••••••••••••••••
(*) Where appropriate , state the class(es ) of the tractor(s ) for which
      seat is intended*
(**) Delete whichever is inapplicable.
 ---pagebreak---                                   -  *7   -              Annex IV . p. 1
 SEAT INSTALLATION REQUIREMENTS FOR EEC TYPE-APPROVAL OF A TRACTOR
 1.         Every driver 's seat must bear the EEC type-approval mark and
            comply with the following installation requirements :
 1.1#       The driver ^ seat must be installed in such a way that g
 1.1*1 *    the driver is assured of a comfortable position for driving
            and manoeuvring the tractor ;
 1.1*2 *    the seat is easily accessible ;
 1.1 * 3 »  the driver , when seated in the normal driving position , can
            easily reach the various controls of the tractor that are
           likely to be actuated during operation ;
 1.1*4 *   no part of any of the seat or tractor components is likely
           to cause the driver to suffer cuts or bruises *
2.         The holder of the EEC type-approval may request that it be
           extended to other types of seat . The competent authorities
           shall grant this extension on the following conditions :
2*To       the new type of seat has received EEC type-approval ;
2.2 *      it ha6 been designed to be installed on the type of tractor
           for which the extension of the EEC type-approval has been
           requested ;
2.JJ *     it is installed in such a manner as to comply with the instal­
           lation requirements in this Annex .
J*         Seats intended for tractors with a minimum distance of
           1 150 mm between the rear wheels may have the following mini­
           mum dimensions with respect to the depth and width of the
           seat surface :
                    depth of seat surface   :  J00 mm
                    width of seat surface   :  kOO mm
 ---pagebreak---                        - 48 -                Annex IV , p. 2
This provision is applicable only if the values specified
for the depth and the width of the seat surface - i.e. , mini­
mum of 400 + 50 mm said 450 mm respectively - cannot be obser­
ved for valid technical reasons .
A certificate conforming to the model shown in Annex V shall
be attached to the EEC type-approval certificate for each
type-approval or extension of type-approval granted or refused#
 ---pagebreak---                                       - 49 -                 Annex V
                                      ANNEX V
ANNEX TO THE EEC TYPE-APPROVAL CERTIFICATE FOR A TRACTOR : THE DRIVER 'S SEAT
 ( Article 4(2) and Article 10 of Council Directive No 74/150/EEC of 4« 3.1974
on the approximation of the laws of the Member States relating to the type-
approval of wheeled agricultural or forestry tractors )
                                                           Name of the
                                                      competent authority
EEC Tvrpe-approval No ••••••••••••••••••••••••••••••••••••••••••••••••••,
•••••••••••••••••••••••••••a extension (*)
1.   Trademark of tractor
      ·······························*··································· )
2*   Hype of tractor •••••••••••••••••••••••••••••••••••••••••••••••••••<
3*   Name and address of tractor manufacturer
4*   If applicable , name and address of authorized representative
5.   Trademark of driver 's seat and component type–approval number ••••••••
6.   Extension of EEC type-approval of the traotor to the following seat
     type
7*   Tractor submitted for EEC type-approval on ••••••••••••••••••••••••••<
8*    Technical department responsible for verifying conformity for the
      purpose of EEC type-approval ••••••••••••••••••••••••••••••••••••••••<
9*    Date of report issued by that department ••••••••••••••••••••••••••••<
10* Number of report issued by that department •••••••••••••••••••••••»••<
11 . EEC type–approval with respect to the driver 's seat has been granted/
      refused (**) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••
 12« An extension of EEC type–approval with respect to the driver 's seat
      has been granted/refused (**) •••••••••••••••••••••••••••••••••••••••
 13. Place •••••••••••••••••••••••••••••••••••••••••••••••••••••
 14* Date ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
 15 . Signature ••••••••••••••••••••••••••••••••••••••••••••>••••••••••••••
  (*) Where appropriate , state whether the extension of the initial EEC
       type-approval is the first , second , etc#
  (**) Delete whichever is inapplicable .