Interpretation ID: nht67-1.24

DATE: 08/18/67

FROM: AUTHOR UNAVAILABLE; Lowell K. Bridwell; NHTSA

TO: Mercedes-Benz of North America, Inc.

TITLE: FMVSS INTERPRETATION

TEXT: This is in response to your request to Dr. Haddon for an interpretation of the term "rigid material" as it appears in paragraph S3.4.1(b) in the National Highway Safety Bureau's "talking paper" of July 6, 1967. This term is identical to that used in paragraph S.3.4.1(b) of Standard 201, issued August 11, 1967. Therefore, the following interpretation applies to Standard 201 as issued August 11, 1967, a copy of which is enclosed.

"Rigid material" does not include a supporting structure of an armrest that is made of flexible spring steel if the supporting structure is designed to flex in the direction of transverse impact upon the pelvic impact area.

MERCEDES-BENZ OR NORTH AMERICA INC.

July 11, 1967

Dr. William Haddon, Jr. Director National Highway Safety Bureau

Re.: Application for Binding Ruling Standard 201, provisional July 6, 1967, Armrests S 3.4.1 (b).

As indicated in the discussion of the proposed language on July 9, 1967, we are applying for a ruling that the definition of "rigid material" in line 4 shall be understood not to include such supporting structures of armrests which are made of flexible spring steel when such supporting structure designed to flex in the direction of transverse impact upon the pelvic impact area, and shall therefore not be subject to the requirement of "minimum vertical height of not less than 1"."

Argument: There are numerous armrest designs which may not qualify under the requirements of S 3.4.1(a) since they are at some part less than 2" wide laterally, and therefore must qualify under Para. (b). If such armrests are designed to combine the function of a door opener, i.e. with a fingerhole, a flexible spring core is ideally suited and has many times been used as a demonstrably safe design in the past. The spring material, which need not necessarily be steel but may also take the form of various plastics, provides the necessary strength for vertical support required for an armrest but gives upon transverse impact to avoid injury.

We should be grateful to receive your ruling at the earliest possible date in view of current production schedules for the 1968 models, and in view of the fact that with this indication we agreed to wave further amending language of the standard Para. S 3.4.1 (b), so as to provide for the possibility of clear definitions in some future revisions.

Respectfully,

H. C. Hoppe