Interpretation ID: 1985-03.12

TYPE: INTERPRETATION-NHTSA

DATE: 07/09/85

FROM: AUTHOR UNAVAILABLE; Jeffrey R. Miller; NHTSA

TO: Yoshikazu Ito, Manager, Tokai Rika Co., Ltd.

TITLE: FMVSS INTERPRETATION

TEXT:

Mr. Yoshikazu Ito, Manager Technical Operations Section Overseas Operations Dept. Tokai Rika Co., Ltd. Oguchi-Cho, Aichi Pref. 480-01 Japan

Thank you for your letter concerning the buckle release requirements of Standard No. 208. Occupant Crash Protection. I apologize for the delay in responding to it. You asked for an interpretation of the requirement in S4.5.3.3(a) of the standard that automatic belts must have an emergency release mechanism that is "readily accessible to a seated occupant." The following discussion addresses the specific questions you asked.

The purpose of the "readily accessible" requirement is to ensure that a seated occupant can quickly and easily grasp and then release the buckle in an emergency. You explained that you have been reviewing the accessibility of possible installation locations for the emergency release by using a 5th percentile female and 50th percentile male test dummy in various seating positions. You ask whether in determining if the buckle is readily accessible, you can move the pelvic portion of the test dummy or move the seat back to permit the grasping of the buckle.

The purpose of S4.5.3.3(a) is twofold. First, it is intended to make sure automatic belts are adjustable to fit a wide range of vehicle occupants, as specified in S7.1 of the standard. In addition, it is meant to ensure that the emergency release mechanism for the automatic belt is readily accessible to that same range of occupants. Thus, the release mechanism should be accessible to those occupants with the seat in any design position without the occupant having to take special steps, such as moving the seat back, to grasp and operate the release. I note that the drawing you attached to your letter indicates that your emergency release is located within the latchplate access zone specified in S7.4.4 of the standard. Although S7.4.4 does not apply to the emergency release mechanism of automatic belts, its purpose is to make it easy for occupants to reach the latchplate of a safety belt system. We would consider any emergency release mechanism required by S4.5.3.3(a) that is within the latchplate access zone of S7.4.4 to be readily accessible as long as the occupant does not have to take any special steps to grasp and operate the release.

If you have any further questions, please let me know.

Sincerely,

Jeffrey R. Miller Chief Counsel

TOKAI RIDA CO., LTD.

ESL85/1-7955 February 22, 1985

Ms. Betrinere Stewart Library Technician Technical Reference Division National Highway Traffic Safety Administration U.S. Department of Transportation 400 Seventh Street, S.W. Washington D.C. 20590 U. S. A.

Dear Ms. Stewart:

Although somewhat belatedly, I would like to express my sincere appreciation to your many kindest assistances extended to me when I visited your office. The information we received from you is very valuable.

In the meantime, we have some questions regarding how a sentence of Standard No. 208 should be interpreted, and its details are explained in the attachment.

Would you therefore please give us appropriate answer, and if you are not in a position to reply, you would kindly pass this question to a competent officer so that we may receive the answer.

Your favourable consideration in this matter would be much appreciated.

Yours sincerely,

TOKAI RIKA CO., LTD.

Yoshikazu Ito, Manager Technical Operations Section Overseas Operations Dept.

YI/yi

Attachments

CC: Mr. T. Tanabe, TR/USO

Stipulation: S4.5.3.3, No. 208

An automatic belt furnished pursuant to S4.5.3. shall: (a) conform to S7.1 and have a single emergency release mechanism whose components are readily accessible to a seated occupant.

1. Background of the question:

In designing of a certain passive belt system to be installed on our customer's vehicles, a detachable type buckle for emergency release is built in.

When installing the system on the vehicles, it is difficult for a seated occupant to access to the buckle in some cases (See attachment). So we ask you to give us your appropriate interpretation on the following cases.

2. Question

-1. What is a meaning of the sentence, " ..... whose components are readily accessible to a seated occupant"?

(Our Interpretation)

"readily accessible to" means strictly that a seated occupant can grasp the buckle and then release it in case of emergency.

-2. When reviewing installation condition by using Alderson female dummy (5th percentile), at any seating position (forwardmost, neutral or rearmost), if it is difficult that the dummy access to the buckle, whether the following condition(s) are permitted or not:

a. an occupant (dummy) would be permitted to raise her pelvic portion slightly in order to grasp the buckle.

b. an occupant (dummy) would be permitted to bring down the seat-back in order to grasp easily the buckle.

-3. When reviewing installation condition by using Alderson male dummy (50th percentile), at forwardmost and neutral seating position, if it is difficult that the dummy access to the buckle, whether the followings are permitted or not:

a. the same to above condition - 2-a.

b. the same to above condition - 2-b.