Road vehicles -- Anchorages in vehicles and attachments to anchorages for child restraint systems

This document establishes the positioning zones, dimensions and general and static strength requirements for lower tether anchorages. Lower tether anchorages can be used together with seat bight anchorages according to ISO 13216-1, or with other methods for anchoring child restraint systems (CRS) in road vehicles. This document is applicable to all seating positions, intended by the vehicle manufacturer, for use with rearward-facing CRSs. These seating positions can include outer and mid positions in rear seats (second and third row), as well as the front passenger seat. This document also specifies requirements and strength testing of retrofit lower tether anchorages.

Véhicules routiers -- Ancrages dans les véhicules et attaches aux ancrages pour systèmes de retenue pour enfants

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Publication Date
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INTERNATIONAL ISO
STANDARD 13216-4
First edition
2020-10
Road vehicles — Anchorages
in vehicles and attachments to
anchorages for child restraint
systems —
Part 4:
Lower tether anchorages
Véhicules routiers — Ancrages dans les véhicules et attaches aux
ancrages pour systèmes de retenue pour enfants —
Partie 4: Ancrages pour fixation des sangles inférieures
Reference number
ISO 13216-4:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 13216-4:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 13216-4:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Dimensions and installation requirements ............................................................................................................................. 2

4.1 Description and applicability of lower tether anchorages or LTA mounting points ................... 2

4.2 Positioning of lower tether anchorages............................................................................................................................. 2

4.3 Lower tether anchorage design ................................................................................................................................................ 5

5 Lower tether anchorage strength requirements and testing ................................................................................. 5

5.1 Strength test method ......................................................................................................................................................................... 5

5.2 Strength requirements ..................................................................................................................................................................... 7

6 Instructions and marking ........................................................................................................................................................................... 7

Annex A (normative) ISO/R2 positioning procedure for non-ISOFIX seat position ............................................8

Annex B (normative) Requirements and testing of retrofit lower tether anchorages .....................................9

Annex C (informative) Example LTA installations ................................................................................................................................12

Annex D (informative) Example from seat track survey of 24 cars ...................................................................................15

Bibliography .............................................................................................................................................................................................................................17

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 13216-4:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 22 Road vehicles, Subcommittee SC 36

Safety and impact testing.
A list of all parts in the ISO 13216 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 13216-4:2020(E)
Introduction

Lower tether anchorages (LTA), for rearward facing child restraint systems (CRSs) in passenger cars,

are used to enhance protection of children in cars. The lower tethers help to reduce CRS rotation in rear

impacts, during the rebound phase in frontal impacts, and in rollover events. Lower tethers, attached

to the LTA, may be used together with seat bight anchorages according to ISO 13216-1 (ISOFIX), or with

other methods for mounting rearward facing CRS in road vehicles, mainly using the vehicle seat belt.

In line with ISOFIX, standardization of LTA enables pre-installed anchorages with adequate performance

within a designated zone. Pre-installed anchorages will improve the usability and reliability of attaching

the lower tethers. In addition, having dedicated anchorages reduces the risk of tethers routed in a way

that can damage the car interior, seat chassis, cables under the seat, etc.

Dedicated pre-installed anchorages will ensure ease-of-use, reduce risk of misuse and simplify

the mounting of a rearward facing CRS. With the use of lower tethers and specified LTA and tether

connectors (click-in function in analogy with ISOFIX connectors) the CRS can be easily attached.

This document provides requirements and guidelines to facilitate the introduction of lower tether

anchorages in passenger cars contributing to ease-of-use, reduction of potential damage to vehicle

interior, and increased safety by facilitating increased use of rearward facing CRSs.

Background

Rearward facing CRSs have been available on the market since late 1960s and are used for infants as

well as toddlers. In the Nordic countries, they have been used since their introduction as the main CRS

for children up to approximately four years of age and have provided evidence of excellent occupant

protection.

Most of the large rearward facing CRSs use lower tethers, which are attached to the floor area or seat

in front of or below the seating position of the CRS. There is more than 40 years of experience of lower

tether usage. Some cars have pre-installed anchorages in which the lower tethers can easily be attached.

The most common positions of the anchorages are on the seat rails in front of the CRS (inside, outside,

or end of seat rails), but alternative placements are also used.

However, the majority of the vehicles have no pre-installed anchorages, as a consequence the tethers

are instead routed around the seat chassis, the seat cushion or other parts that can be accessed.

The primary attachment of the rearward facing CRS is the ISOFIX or the vehicle seat belt. In addition, a

support leg is usually used together with the lower tethers. An alternative to the lower tether is to use

a bar pressed against the vehicle seat backrest (so-called rebound bar). The rebound bar provides some

effect to reduce rotation in rear-end impacts and the rebound phase in frontal impacts, however it is

not sufficient for the large rearward facing CRSs, especially when attached using the vehicle seat belt.

The lower tethers also provide superior protection in rollover or turnover events.

© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 13216-4:2020(E)
Road vehicles — Anchorages in vehicles and attachments
to anchorages for child restraint systems —
Part 4:
Lower tether anchorages
1 Scope

This document establishes the positioning zones, dimensions and general and static strength

requirements for lower tether anchorages.

Lower tether anchorages can be used together with seat bight anchorages according to ISO 13216-1, or

with other methods for anchoring child restraint systems (CRS) in road vehicles.

This document is applicable to all seating positions, intended by the vehicle manufacturer, for use with

rearward-facing CRSs. These seating positions can include outer and mid positions in rear seats (second

and third row), as well as the front passenger seat.

This document also specifies requirements and strength testing of retrofit lower tether anchorages.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 13216-2:2004, Road vehicles — Anchorages in vehicles and attachments to anchorages for child

restraint systems — Part 2: Top tether anchorages and attachments

ISO 13216-3, Road vehicles — Anchorages in vehicles and attachments to anchorages for child restraint

systems — Part 3: Classification of child restraint system and space in vehicle
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13216-2 and ISO 13216-3, and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
lower tether anchorage
LTA

anchorage on the vehicle seat track or on or close to the vehicle floor to which a lower tether (3.4) can be

attached

[SOURCE: ISO 29061-1:2010, 3.15, modified — The term "rebound tether anchorage" has been deleted

and the phrase "rebound tether" has been deleted in the definition before "lower tether".]

© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 13216-4:2020(E)
3.2
retrofit lower tether anchorage
retrofit LTA
lower tether anchorage (3.1) for after-market installation in the vehicle
Note 1 to entry: Retrofit LTAs can be provided by OEMs or CRS manufacturers.
3.3
LTA mounting point

mounting point prepared by the vehicle manufacturer for installation of retrofit LTA (3.2)

3.4
lower tether

type of anti-rotational device intended to restrict the rearward rotation of a rearward-facing CRS

Note 1 to entry: It usually comprises a tether strap or other hardware attached near the back or base of the

CRS that connects to a lower tether anchorage. It incorporates a device to enable it to be connected to such an

anchorage.

[SOURCE: ISO 29061-1:2010, 3.14, modified — The term "rebound tether" has been deleted.]

4 Dimensions and installation requirements

4.1 Description and applicability of lower tether anchorages or LTA mounting points

Lower tethers are used to increase installation stability and to reduce rotation in a rear impact as well

as rebound effects in a frontal impact. The usability and reliability of lower tether attachments can be

greatly improved when lower tether anchorages are pre-installed in the vehicle.

Lower tether anchorages for rearward facing CRSs are similar to, and for most aspects comparable to,

the top tether anchorages for forward facing CRSs.

The most common positions of lower tether anchorages are on the seat rails in front of the CRS (inside,

outside, or end of seat rails), but alternative methods are also used. For most vehicles it is relatively

easy to introduce lower tether anchorages, since there are already seat rails or other appropriate

structures available in the applicable zones. Example installations are shown in Annex C. A summary of

the background feasibility study is given in Annex D.

The requirements and guidelines of this document are intended to facilitate the introduction of lower

tether anchorages in vehicles.

The specifications apply to completely installed LTAs by the vehicle manufacturer and to mounting

points prepared for the installation of retrofit LTAs. To ensure sufficient strength of retrofit LTAs, the

specifications given in Annex B shall be followed.

The installation requirements in 4.2 and the dimension requirements in 4.3 also apply to retrofit LTAs.

4.2 Position
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 13216-4
ISO/TC 22/SC 36 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2019-09-19 2019-12-12
Road vehicles — Anchorages in vehicles and attachments
to anchorages for child restraint systems —
Part 4:
Lower tether anchorages

Véhicules routiers — Ancrages dans les véhicules et attaches aux ancrages pour systèmes de retenue pour

enfants —
Partie 4: Ancrages pour fixation des sangles inférieures
ICS: 43.040.80
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 13216-4:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
---------------------- Page: 1 ----------------------
ISO/DIS 13216-4:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 13216-4:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Dimensions and installation requirements ............................................................................................................................. 2

4.1 Description and applicability of lower tether anchorages or LTA mounting points ................... 2

4.2 Positioning of lower tether anchorages............................................................................................................................. 2

4.3 Lower tether anchorage design ................................................................................................................................................ 5

5 Lower tether anchorage strength requirements and testing ................................................................................. 5

5.1 Strength test method ......................................................................................................................................................................... 5

5.2 Strength requirements ..................................................................................................................................................................... 7

6 Instructions and marking ........................................................................................................................................................................... 7

Annex A (normative) ISO/R2 positioning procedure for non-ISOFIX seat position ............................................8

Annex B (normative) Requirements and testing of retrofit lower tether anchorages .....................................9

Annex C (informative) Example LTA installations ................................................................................................................................12

Annex D (informative) Example from seat track survey of 24 cars ...................................................................................15

Bibliography .............................................................................................................................................................................................................................17

© ISO 2019 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 13216-4:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 22 Road vehicles, Subcommittee SC 36

Safety and impact testing, WG 2 Child restraint systems.
A list of all parts in the ISO 13216 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/DIS 13216-4:2019(E)
Introduction

Lower tether anchorages (LTA), for rearward facing child restraint systems (CRSs) in passenger cars,

are used to enhance protection of children in cars. The lower tethers help to reduce CRS rotation in rear

impacts, during the rebound phase in frontal impacts, and in rollover events. Lower tethers, attached

to the LTA, may be used together with seat bight anchorages according to ISO 13216-1 (ISOFIX), or with

other methods for mounting rearward facing CRS in road vehicles, mainly using the vehicle seat belt.

In line with ISOFIX, standardization of LTA enables pre-installed anchorages with adequate performance

within a designated zone. Pre-installed anchorages will improve the usability and reliability of attaching

the lower tethers. In addition, having dedicated anchorages reduce the risk of tethers routed in a way

that can damage the car interior, seat chassis, cables under the seat etc.

Dedicated pre-installed anchorages will ensure ease-of-use, reduce risk of misuse and simplify

the mounting of a rearward facing CRS. With the use of lower tethers and specified LTA and tether

connectors (click-in function in analogy with ISOFIX connectors) the CRS can be easily attached.

This document provides requirements and guidelines to facilitate the introduction of lower tether

anchorages in passenger cars contributing to ease-of-use, reduction of potential damage to vehicle

interior, and increased safety by facilitating increased use of rearward facing CRSs.

Background

Rearward facing CRSs have been available on the market since late 1960’s and are used for infants as

well as toddlers. In the Nordic countries, they have been used since their introduction as the main CRS

for children up to approximately four years of age and have provided evidence of excellent occupant

protection.

Most of the large rearward facing CRSs use lower tethers, which are attached to the floor area or seat

in front of or below the seating position of the CRS. There is more than 40 years of experience of lower

tether usage. Some cars have pre-installed anchorages in which the lower tethers can easily be attached.

The most common positions of the anchorages are on the seat rails in front of the CRS (inside, outside,

or end of seat rails), but alternative placements are also used.

However, the majority of the vehicles have no pre-installed anchorages, as a consequence the tethers

are instead routed around the seat chassis, the seat cushion or other parts that can be accessed.

The primary attachment of the rearward facing CRS is the ISOFIX or the vehicle seat belt. In addition, a

support leg is usually used together with the lower tethers. An alternative to the lower tether is to use

a bar pressed against the vehicle seat backrest (so-called rebound bar). The rebound bar provides some

effect to reduce rotation in rear-end impacts and the rebound phase in frontal impacts, however it is

not sufficient for the large rearward facing CRSs, especially when attached using the vehicle seat belt.

The lower tethers also provide superior protection in rollover or turnover events.

© ISO 2019 – All rights reserved v
---------------------- Page: 5 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 13216-4:2019(E)
Road vehicles — Anchorages in vehicles and attachments
to anchorages for child restraint systems —
Part 4:
Lower tether anchorages
1 Scope

This document establishes the positioning zones, dimensions and general and static strength

requirements for lower tether anchorages.

Lower tether anchorages may be used together with seat bight anchorages according to ISO 13216-1, or

with other methods for anchoring child restraint systems (CRS) in road vehicles.

This document is applicable to all seating positions, intended by the vehicle manufacturer, for use with

rearward-facing CRSs. These seating positions can include outer and mid positions in rear seats (second

and third row), as well as the front passenger seat.

This document also specifies requirements and strength testing of retrofit lower tether anchorages.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For undated references, the latest edition of the referenced

document (including any amendments) applies.

ISO 13216-2:2004, Road vehicles — Anchorages in vehicles and attachments to anchorages for child

restraint systems — Part 2: Top tether anchorages and attachments

ISO 13216-3:2018, Road vehicles — Anchorages in vehicles and attachments to anchorages for child

restraint systems — Part 3: Classification of child restraint system and space in vehicle

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 13216-2 and ISO 13216-3, and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at http: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
lower tether anchorage
LTA

anchorage on the vehicle seat track or on or close to the vehicle floor to which a lower tether can be

attached
[SOURCE: ISO 29061-1, definition 3.15]
© ISO 2019 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/DIS 13216-4:2019(E)
3.2
retrofit lower tether anchorage
retrofit LTA
lower tether anchorage for after-market installation in the vehicle
Note 1 to entry: Retrofit LTAs can be provided by OEMs or CRS manufacturers.
3.3
LTA mounting point

mounting point prepared by the vehicle manufacturer for installation of retrofit LTA

3.4
lower tether

type of anti-rotational device intended to restrict the rearward rotation of a rearward-facing CRS

Note 1 to entry: It usually comprises a tether strap or other hardware attached near the back or base of the CRS

connects to a rebound tether (lower tether) anchorage. It incorporates a device to enable it to be connected to

such an anchorage.
[SOURCE: ISO 29061-1, definition 3.14]
4 Dimensions and installation requirements

4.1 Description and applicability of lower tether anchorages or LTA mounting points

Lower tethers are used to increase installation stability and to reduce rotation in a rear impact as well

as rebound effects in a frontal impact. The usability and reliability of lower tether attachments can be

greatly improved when lower tether anchorages are pre-installed in the vehicle.

Lower tether anchorages for rearward facing CRSs are similar to, and for most aspects comparable to,

the top tether anchorages for forward facing CRSs.

The most common positions of lower tether anchorages are on the seat rails in front of the CRS (inside,

outside, or end of seat rails), but alternative methods are also used. For most vehicles it is relatively easy

to introduce lower tether anchorages, since there are already seat rails or other appropriate structures

available in the applicable zones.

The requirements and guidelines of this document are intended to facilitate the introduction of lower

tether anchorages in vehicles.

The specifications apply to completely installed LTAs by the vehicle manufacturer and to mounting

points prepared for the installation of retrofit LTAs.
The i
...

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