IS 15139: Automotive Vehicles -- Safety Belt Anchorages -

20 Pages·2002·1.8 MB·English

by  Bureau of Indian Standards

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in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS 15139 (2002): Automotive Vehicles -- Safety Belt
Anchorages - [TED 6: Automotive Body, Chassis, Accessories
and Garage Equipments]
“!ान $ एक न’ भारत का +नम-ण”
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“Knowledge is such a treasure which cannot be stolen”

Is 15139:2002

Indian Standard
AUTOMOTIVE VEHICLES — SAFETY BELT
ANCHORAGES — SPECIFICATION
1CS43.040.60
--

0 BIS 2002
i BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEWDELH1110002

July2002 Price Group7
/’ i’
Automotiv~ Body, Chassis Accessories and Garage Equipment Sectional Committee, TED 6
FOREWORD
This Indian Standard was adopted bythe Bureau ofIndian Standards, after the drafl finalized bythe Automotive
Body, Chassis Accessories and Garage Equipment Sectional Committee had been approved by the Transport
Engineering “DivisionCouncil.
In the preparation of this standard considerable assistance has been taken from AIS 015.2000 AUTOMOTIVE
VEHICLES: SAFETY BELTANCHORAGES —SPECIFICATIONS, preparedbyAutomotive IndustryStandards
Committee setupbytheMinistry ofRoadTransport andHighways, Government ofIndia.AIS015.2000 isfurther
based onECE Regulation 14.02‘Uniform Provisions Concerning theApproval ofVehicles with Regard to Safety
BeltAnchorages’andEECDirective76/115/EECasamendedby96/38/EEC‘MotorVehicleSafetyBeltAnchorages’.
Seats, safety belts, safety belt anchorages, etc, are safety critical items for the passengers in case of sudden
deceleration and accidents. Further, seats and their design, mounting, etc, constitute substantially to the riding
comforts ofthe vehicle users. Safety belts have become mandatory titments on frontseats of Mand Ncategories
of vehicles from April 1994 in India. Safety belts without a proper anchorage does not serve any purpose.
Hence, it is necessary to have a standard for safety belt anchorages to supplement the safety belts standard
IS 15140:2002 ‘Automotive vehicles-safety beltassembly—Specification’.
The composition ofthe Committee responsible forformulation ofthis standard isgiven inAnnex B.
For the purpose of deciding whether aparticular requirement of this standard iscomplied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with
IS 2:1960 ‘Rules forrounding off numerical values (revised’. Thenumber ofsignificant places retained inthe
rounded off value should be the same asthat ofthe specified value inthis standard.

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Is 15139:2002
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-— Indian Standard
AUTOMOTIVE VEHICLES — SAFETY BELT
ANCHORAGES — SPECIFICATION
\ 1 SCOPE its wearer, in the event of collision or abrupt vehicle
deceleration by limiting the mobility of the body of
1.1 This standard specifies the requirements of safety
wearer. Such an arrangement is referred to as a ‘belt
belt anchorages namely, minimum numbers, their
assembly’,atermalsoembracing anydeviceforenergy
locations, static strength to reduce the possibility of
absorption or belt retraction.
their failure during accidental crashes for effective
occupant restraint and the test procedures. 3.5Strap Guide — Adevice which altersthe lieofthe
strap inrelation tothe wearer ofthe belt assembly.
1.2 This standard applies to the anchorages of safety
beltsforadultoccupants offorward-facing orrearward 3.6 Effective Belt Anchorage — The point used to
facingseatsinvehiclesofcategories&landNas defined determine conventionally asspecified in4.4,the angle
inIS14272(Part 1). ofeach part ofthe safety belt inrelation to the wearer
that is the point to which a strap would need to be
2 REFERENCES attached to provide the same lie asthe intended lie of
the beltwhen worn, andwhich may ormay not bethe
2.1 The following standards contain provisions which
actual belt anchorage depending onthe configuration
through reference in this text, constitute provision of
ofthe safety belt hardware at itsattachment tothe belt
this standard. At the time of publication, the editions
anchorage.
indicated were valid. All standards are subject to
revision, and parties to agreements based on this 3.6.1 Where a safety belt incorporates a rigid part
standard are encouraged to investigate the possibility which is attached to a lower belt anchorage, either
of applying the most recent editions of the standards fixedorfreetoswivel, theeffective belt anchorage for
-- indicated below: allpositions of seat adjustment isthe point where the
strap is attached to that rigid part.
IS No. Title
13749:1993 Automotive vehicles — Determinat- 3.6.2 Where a strap guide is used on the vehicle or
ion ofH-Point — Method ofTest seat structure, the middle point of the guide at the
14272 Automotive vehicles — Types — place where the strap leaves the guide on the belt of
(Part1): 1995 Terminology: Part 1Three andfour wearer side, shall be considered as the effective belt

wheelers anchorage.

3 TERMINOLOGY 3.6.3 Where the belt runs directly from the wearer to
a retractor attached to the vehicle or seat structure
Forthe purposes ofthis standard, the following terms
without an intervening strap guide, the effective belt
and definitions shall apply.
anchorage shall be considered as being the inter-
3.1 Approval of aVehicle — Theapprovalofavehicle sections oftheaxisofthereelforstoring thestrapwith
type with anchorage$ for given types of safety-belts. the plane passing through the centre Iine of the strap
onthe reel.
3.2 Vehicle Type -– A category of power-driven
vehicles which don~tdiffer insuch essential respects 3.7 Floor— The lower part ofthe vehicle body-work
asthe dimensions, lines and materials of components connecting the vehicle sidewalls. Inthis context, this
of the vehicle structure or seat structure to which the includes ribs, swages and possibly other reinforce-
anchorages are attached. ments, even if they are below the floor, such as
longitudinal and transverse members.
3.3 Belt Anchorage — The parts of the vehicle
structure or the seat structure or any other part of the 3.8Seat — Astructurewhichmayor maynotbeintegral
vehicle to which the safety belt assemblies are to be withthevehiclestructurecompletewithtrim,intendedto
secured. seatoneadultperson.Thetermcoversbothanindividual
seatorpartofabench seatintendedto seatoneperson.
3.4 Safety Belt/!3eat Belt/Belt — An arrangement of
straps with a securing buckle, adjusting devices and 3.9 Front Passenger Seat — Any seat where the
attachments whii$his capable of being anchored to a ‘H pointmeasured intheforemost position’ ofthe seat
vehicle and desi$ned to diminish the risk of injury to in question is in or in front of the vehicle transverse

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IS 15139:2002
plane through the driver R-point, 3.22 R Point or the Seating Reference Point — Itis
the design point defined by the manufacturer which
3.10 Group of Seats — A bench-type seat, or seats
has co-ordinates determined inrelation to the vehicle
which are separate but side by side (that is, with the
structure and corresponds to the theoretical positions
foremost anchorages ofoneseatinlinewithorforward
of the point of torso/legs rotation for the lowest and
ofthe rearmost anchorages and inline with orbehind
therearmost normal driving position orposition ofuse
the foremost anchorages of another seat) and acco-
giventoeachseatprovided bythevehiclemanufacturer
mmodate one or more seated adult persons.
(see Fig. 1).
3.11 Bench Seat — A structure complete with trim,
3.23 Torso Angle — It isthe inclination of the seat
intended to seat more than one adult person.
back in relation to the vertical.
3.12 Folding Seat — An auxiliary seat intended for
3.24 Actual Torso Angle — Itisthe angle formed by
occasional use which isnormally folded.
the vertical through the H point with reference to the
3.13 Seat Type — A category of seats which do not torso line of the human body represented by the
differ in parameters such as : manikin described in IS 13749.
a) The shape, dimensions and materials of the 3.25 Design Torso Angle — Itisthe angle prescribed
seat structure; by the manufacturer which determines the seat back
b) The type and dimensions of the adjustment angle forthe lowestandmostrearward normal driving
systems and all locking systems; and position or position of use given to each seat by the
c) The type and dimensions of the belt anchor- vehicle manufacturer.
ages onthe seat, oftheseatanchorage andof
3.26 Torso Reference Line of the Manikin — Itisa
the affected parts of thd vehicle structure.
straight linepassing through thejoint between the leg
3.14 Normal Seating Position — Theseatingposition and the pelvis and the theoretical joint between the
to which the seat is designed to sit as defined by the neckandthorax (seeFig. l).
vehicle manufacturer.
3.27 Reference Zone — It isthe space between two
3.15Outboard Seat —Theforward facingseatnextto vertical longitudinal planes, 400 mm and symmetrical
the side doorslside walls of body shell. with respect to the H Point and defined by rotation
from thevertical tothehorizontal position ofthe head
3.16Outboard Seating Position —Theseatingposition
form apparatus. This consists of a spherical head,
near to the side doorslside walls o~the shell of the
165mm indiameter andanarrangement bywhich the
vehicle in case of bench seat.
dimensions from thepivotal point ofthe hiptothe top
3.17 Seat Anchorage —Thesystembywhichtheseat ofheadsphere iscontinuously adjustable between 736

assembly issecured to the vehic le structure including mmand840mm.Thisshallbesettoamaximum length
the affected parts of the vehicle str u cture. of840mmandpositioned foreachseating position for
which the manufacturer has made provision as given
3.18 Adjustment System — The device bywhich the
below:
seat or itsparts can be adjusted to aposition suited to
the morphology of the seated occupant; this device a) Inthe case of sliding seats :
may permit:
1) Atthe H Point; and
a)longitudinal displacement;
2) At apoint situated horizontally 127mm
b) vertical displacement; and forward of the H point and either at a
c)angular displacement. height resulting from the variation inthe
height oftheHpoint causedbyaforward
3.19 Displacement System — Adevice enabling the
shift of 127mm or of 19mm.
seatoroneofitspartstobedisplaced orrotatedwithout
afixed intermediate position, to permit easyaccessto b) Inthe case of non-sliding seats:
the space behind the seat concerned.
Atthe H Point ofthe seat considered.
3.20 Locking System — A device ensuring that the 4REQUIREMENTS
seat and its parts are maintained in any position of
use and the seat relative to the vehicle. 4.1 General
3.21 H Point — Itrepresents the pivot centre oftorso Anchorages for safety belt shall be sodesigned, made
andtheoccupant intheseatedposition inthepassenger and situated asto:
compartment. It is measured with the manikin as
a)- Enabletheinstallationofasuitablesafetybelt.
described inIS 13749.
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Is 15139: 2UUZ
The belt anchorages of the front ,outboard 4.3.4 If seat belts are provided by the vehicle manu-
positions shall be suitable for safety belts facturer as original equipment fitrnent for the other
incorporating a retractor and pulley, taking outboard seats of the vehicle category Ml, there shall
into consideration in particular the strength betwo lower belt anchorages ifonly 2-point lap belts
characteristics ofthe belt anchorages, unless areprovided andadditionally oneupper beltanchorage
the manufacturer supplies the vehicle if3-point belts areprovided.
equipped withothertypeofsafetybeltswhich
4.3.5 If seat belts are provided by the vehicle manu-
incorporate retractors. If the anchorages are
facturer asoriginal equipment tlment forother seatsin
suitable only for particular types of safety
Mlcategory vehicle and all other non-protected seats
belts, it should be clearly indicated;
in categories other than Ml as given in 4.3.1, there
b) Reduce toaminimum the risk ofthe slipping
shall be atleasttwo lower belt anchorages.
of the belt when worn correctly;
4.3.6 For folding seats, andalltheseatsofany vehicle
c) Reduce to aminimum the risk of strap dam-
not covered by4.3.1, 4.3.2 or4.3.3 nobelt anchorages
age due to contact with sharp rigid parts of
are required. However, if the vehicle is fitted with
the vehicle or seat structures;
anchorages forsuchseats,theanchorages shallcomply
d) Enable the vehicle, innormal use, to comply
with the provisions of this standard. In this case, two
with the provisions of this standard; and
lower anchorages shall be adequate.
e) For anchorages which take updifferent posi-
tions to, allow persons to enter the vehicle 4.3.7 In the case of the upper deck of a double-deck
and to restrain the occupants, the require- vehicle, the requirements for the centre front seating
ments shall apply to the anchorages in the position shall apply also inthe outboard front seating
effective restraint position. positions.
4.2 The vehicle manufacturer shall provide tothe test 4.4 Location of Belt Anchorages
agency all the relevant information /specifications of
4.4.1 Fortherequirements related toareasof locations
the anchorages in the format provided in Annex A.
of effective belt anchorages are shown in Fig. 1.The
4.3 Minimum Number of Belt Anchorages to be belt anchorages for any onebelt may be located either
Provided completely in the vehicle structure or in the seat
structure or any other part of the vehicle or dispersed
4.3.1 For the front seats ofvehicles incategory A4and
between these locations. Any one belt anchorage may
category N,two lower belt anchorages and one upper
beused for attaching the ends of two adjacent safety
belt anchorage shall be provided. However, for front
beltsprovided that the test requirements are met.
central seats, two lower belt anchorages shall be
considered sufficient where thewind screen islocated 4.4.2Location of the Effective Lower Belt Anchorages

outside the reference zone defined in3.27. Asregards
the belt anchorages, the windscree n is considered to 4.4.2.1 Points LI and Lz are the lower effective belt
anchorages. The angles af and az are respectively the
beapartofthereference zoneifitiscapableofentering
angles between ahorizontal plane and planes perpen-
into contact with the test apparatus according to the
dicular tothemedian longitudinal plane ofthe vehicle
method described in3.27.
andpassing through point Hand the points L, and L2.
4.3.2 For out board seating positions, other than front,
of vehicles of category Ml, two lower anchorages are 4.4.2.2 Front seats, vehicle category Ml
allowed, where there exists apassage between aseat
Inmotor vehicles of category Ml, the angle a, (other
and the nearest side-wall of the vehicle intended to
than buckle side) shall be within the range of 30° to
permit access of passengers to other parts of the
80° andthe angle a2 (buckle side) shall be within the
vehicle. A space between a seat and the side-wall is
range of45° to 80°. Both angle requirements shall be
considered as a passage if the distance between that
valid for all normal traveling positions of the front
side-wall, with all doors closed and a vertical longi-
seats, Where at least one of the angles al or az is
tudinal plane passing through the centre line of the
constant(forexample anchorage fixedattheseat)inall
seat concerned, measured atthe R-point position and
normal positions ofuse, itsvalue shall be60l 100.In
perpendicular to the median longitudinal plane ofthe
the case of adjustable seats with an adjusting device
vehicle ismorethan 500mm.
asdescribed in3.18 with aseatback angle of lessthan
4.3.3 The minimum number of safety belt anchorages 20°(seeFig. 1),theangleal maybe belowtheminimum
for rearward facing seats in all locations istwo lower value (30°) given above, provided it is not less than
anchorages. 20° inanynormal position ofuse.

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IS 15139:2002
PERMITTED AREA FOR
DR= 315+1.85
DDITIONAL ANCHORAGES
BR=260+S
( 4.4.3.10.2)
(4,4.3.5 AND 4.4.3.6 )
r
i p REFERENCE LINE
( 3.26)
DISTANCE C
(4.4.3.9 )
,h-.
ANGLE SPECIFIED IN *
5.1.2 R SEATING REFERENCE POINT
A
( 3.22)
0 -+ ..—
i
\
I
L ---~eO ‘ L1
LOWER EFFECTIVE BELT
ANCHORAGES
( L.4.2. 1)
I MEDIAN LONGITUDINAL

PLANE OF THE SEAT P
I r

4
R & 350MIN
i
120MIN
/
sd40MlN
I
FOR LEFT HANO EFFECTIVE UPPER
OUTER SEAT/S BELT ANCHORAJGLE
FIG.1AREASOFLOCATIONOFEFFECTIVEBELTANCHORAGES
Is 15139:2002
4.4.2.3 Rear seats, vehicle category Ml 2X: asegment perpendicular tothe median longi-
tudinal plane of the vehicle, measured from
Inmotor vehicles ofcategory Ml,the angles al andaz
point Zinthe direction of the anchorage and
shallbewithin therange of30°to80°forallrearseats.
120mmlong;and
If rear seats are adjustable, the above angles shall be
valid forallnormal traveling positions. XJI :asegment perpendicular tothe plane defined
by segments RZ and ZXmeasured in a for-
4.4.2.4 Front seats, vehicle categories other than Ml warddirection frompointXand 60mm long.
Inmotor vehiclesofcategoriesotherthanMl, theangles 4.4.3.2 PointJ2 isdetermined bysymmetry with point
ctland a2must be between 30°and 80° forallnormal JI aboutthelongitudinal verticalplanepassingthrough
traveling positions of the front seats. In the case of the torso reference line of the manikin positioned in
vehicleshavingamaximumvehiclemassnotexceeding the seat in question (3.26 and Fig. 1).
3.5 t,and atleastone ofthe angles al oraz isconstant
4.4.3.3 Where a two-door configuration is used to
inallnormal positions of use(for example anchorage
provide accesstoboth the front and rear seats and the
fixed atthe seat) anditsvalue shallbe60°&10°.
upper anchorage is fitted to the ‘B’ post, the system
4.4.2.5 Rear seats and special front or rear seats, mustbedesignedsoasnottoimpedeaccesstooregress
vehicle categories other than Ml from the vehicle.
InvehiclesofcategoriesofotherthanMl, inthecaseof 4.4.3.4 Sisthe distance inmillimetres ofthe effective
upperbeltanchorages fromareference plane Pparallel
a) bench seats;
tothelongitudinal median plane ofthevehicle defined
b) adjustable seats (front and rear) with an
asfollows.
adjusting device as described in 3.18 with a
seat back angle of lessthan 20° (see Fig. 1); 4.4.3.4.1 Ifthe seating position iswell defined bythe
and shapeoftheseat,theplane Pshallbethemedian plane
c) other rear seats. of this seat.
Angles czland az maybe between 20° and 80° inany 4.4.3.4.2 In the absence of awell defined position:
normal position of use. Where inthe case ofthe front
a) The plane Pfortheseat ofdriver isavertical
seats of vehicles having amaximum vehicle massnot
plane parallel to the median longitudinal
exceeding 3.5 t,at least one of the angles al or a2 is
planeofthevehicle which passesthrough the
constant in all normal position of use (for example,
centre of the steering-wheel in the plane of
anchorage fixed attheseat),itsvalueshallbe60+ 100.
the steering-wheel “rimwhen the steering-
Incaseoftheseats,otherthanfrontseats,ofthevehicle wheel, ifadjustable, isinitscentral position;
category Mz and MS, the angle s rz, and az shall be b) Theplane P forthe front outboard passenger

between 45° and 90° for all normal position of use. shallbesymmetrical withthat ofthe driver;

c) The plane P for the rear outboard seating
4.4.2.6 The distance between the two vertical planes
position shall bethat specified by the manu-
parallel to median longitudinal plane of the vehicle
facturer, on the condition that the limits for
and passing through the two effective lower belt
distance A between the longitudinal median
anchorages L]and Lz,shall not be lessthan 350 mm.
planeofthevehicleandplanePare asfollows;
The median longitudinal plane of the seat shall pass
between points L1andLzand shallbe atleast 120mm d) A isequal or more than 200 mm ifthe bench
from these points. seat has been designed to accommodate two
passengers only; and
4.4.3 Location of the Effective Upper Belt Anchorages
e) A isequal or more than 300 mm ifthe bench
(see Fig.1)
seathasbeendesigned toaccommodate more
4.4.3.1 Ifastrap guide or similar device isusedwhich than two passengers.
affects the location of the effective upper belt
4.4.3.5 Theeffective upper anchorages shall liebelow
anchorage, this location shall be determined in a
the plane FN, which runs perpendicular to the
conventional way by considering the position of the
longitudinal median piane of the seat and makes an
anchorage when the longitudinal centre line of the
angleof65°withthereference line.Theangle may be
strap passes through a point JI defined successively
reduced to 60° inthe case of rear seats. The plane FN
from theR point bythe following three segments:
shallbesoplaced asto intersect thereference lineata
RZ: a segment of the reference line measured in pointDsuchthatDR=315 mm+ 1.8S.However, when
anupwarddirection formR and530mmlong; tl~ 200mm,thenDR =675 mm.

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