World wide and IMMI equally argued that factors like the give on the seat belt technique, deflection with the seat cushion, variation in seat cushion contour, seat back size, torso belt anchor spot, and bolster form would impact the posture of the body blocks and make consistent positioning a problem; these elements may perhaps necessitate a sizable zone, which could lead on to variation in check benefits. World-wide also commented which the FMVSS No. 222 examination treatment will not be suited to use in FMVSS No. 210 since the check setup is overly elaborate, and it's tough to make certain constant examination repeatability when positioning the human body blocks.
NHTSA gained 9 reviews in response to your SNPRM: three vehicle company associations, one particular vehicle manufacturer, a few suppliers, 1 international authorities, and just one personal. The commenters elevated many issues and challenges While using the SNPRM. These fears provided, among the other factors, considerations While using the appropriateness of your zone thought, the dimensions in the zones and opportunity variability in the examination final results, and distinct considerations With all the examination methods. There have been also several further feedback with regard to the FADs.
The Alliance, International, and IMMI said they were worried that zones that may be valid for a wide array of vehicles could be much too huge, resulting in extreme variability. The Alliance mentioned that the FMVSS No. 222 zone would be also massive, causing considerable variability in belt force vectors and system general performance Along with the torso blocks positioned at the intense finishes of your zone. The Alliance also said the zones would allow interactions involving the torso and pelvic blocks that may lead to load transfer amongst the blocks, which could bring about non-agent loading on to the seat belt assembly anchorages, and such variability would demand companies to run supplemental compliance screening, and could also travel more Expense and body weight into vehicles.
The NPRM expected the FAD might have an extended support existence as it includes factors (a polyurethane shell, aluminum structural parts, and aluminum and metal peripheral attachments) that should not working experience appreciable wear.
, 375 g/sec). Although the AORC acknowledged that high onset prices do occur during high-speed barrier crashes, it argued that these assessments serve the purpose of demonstrating performance under these problems, so no part-level check is essential. Also, the AORC argued that it does not know of any commercially-offered, part-stage exam devices that can reliably carry out a test using an onset rate higher than two hundred g/sec.
webbing safety belt
The NPRM mentioned that one of the benefits of the FAD is that it is more representative of the human sort as opposed to upper torso and pelvic system blocks. We also identified other benefits of the FAD about your body blocks. We famous which the FAD geometry won't put an unrealistic bending power about the belt buckle, and that the Trend does not have sharp edges, cutting down the chance the seat belt will split in the course of testing.
Unless of course An array of angles is specified or perhaps a tolerance is in any other case explicitly delivered, all angles and orientations of seat belt assemblies and components laid out in this standard shall Have a very tolerance of ±three degrees.
The SNPRM introduced which the company was considering sustaining The existing physique blocks and refining the test procedure to specify the positioning of your body blocks a lot more Obviously in order that manufacturers are knowledgeable of your range of positions that may be analyzed to determine compliance. Following the ( print site 76256) SNPRM was printed, the agency docketed the additional research it experienced carried out to create and validate the zones (along with added screening With all the FAD).
(b) If your seat is surely an adjustable seat, then a line from a point 64 mm ahead of and ten mm earlier mentioned the seating reference point to the closest Call issue of your belt With all the anchorage shall extend forward within the anchorage at an angle with the horizontal of not lower than 30 degrees rather than in excess of seventy five degrees.
The company been given a variety of feedback in response to your NPRM. Vehicle makers and seat suppliers mentioned quite a few issues With all the FAD along with the corresponding seating treatment, including the style and design and performance of your FAD, deficiency of data or experience screening with the Trend, harmonization, and price.
5). The template's “H” level shall be at the design “H” position of the seat for its complete rearward and complete downward posture, as outlined in SAE Advisable Follow J1100 JUN84 (integrated by reference, see § 571.5), and also the template's torso line shall be at the exact same angle from your vertical since the seat back again.
air suspension seats have a far more upright seating configuration and tethers to anchor the seat belts on the taxi composition). Navistar was also concerned about the validity with the examination When the torso belt slipped off the Trend. Agency Response
TUEV and JCI did not present any supporting information on the protocols they used for gauging backrest (seat again) deformation Using the Trend vs . the body blocks, which limits our capability to answer in more detail to this problem.
NHTSA spelled out that the analysis would Consider the zone concept across distinct vehicle varieties (including major vehicles) and seat configurations and acquire zone boundaries that might be feasible and practicable for all or most vehicles.