Back in 20 July 1962, spurred by talk of them being made compulsory, Autocar discussed the merits of various systems of the ‘safety harness’.
“It is very rare for an injured person who has remained inside to have had any personal contact with the other vehicle or lamp post at all,” we began.
“He was almost certainly injured by his collision with his own car. He would not have so collided if the harness had kept him safely in his seat. The great majority of fatal accidents take place at normal speeds, in normal traffic, and however damaged the fronts of the cars involved may be, the steel passenger compartment holds together well.”
So, we wondered, “why has the Minister for Transport been so long deciding to make the fitting of harnesses compulsory in new cars?
“He has probably been waiting for the British Standards (BS) Institution to complete their research with their new dynamic test rig. It can simulate forces at various angles.”
At that time, the BS’s specification already imposed upon seatbelts corrosion resistance, limited webbing stretch, and strength far higher than those of airliners.
The BS also conducted static loading tests, whereas, other researchers tended to use sledges on rails. However, this was ineffective, as “the artificial condition of anchorage in the strong boiler plate and girders of which such sledges are made has had its limits. Bad geometry, which would impose too great an anchorage strain on the light sheet steel of cars, is not shown up”.
Nor were harnesses “in which the shoulder strap runs straight down the seat back” shown up. “In an actual popular car seat, none too strong, with a live and compressible occupant, there may be virtually no protection against “jack-knifing” and banging the head or chest on fascia and steering wheel”.
Back in 1962, some BS-approved harnesses had one single anchorage point behind the seat, with a big reinforcing plate under the car’s floor. Some had two or three.
With two, one was on or near the transmission or the body sill, which were strong points – unlike the centre of the floor. We therefore correctly deemed having multiple anchors as the way forward.
Whether or not having one of the points on the right or left of the driver was still up for debate, though. Autocar suspected that either would be just as good either way. “As the torso tilts, a left shoulder strap seems to catch and bear down on the shoulder, preventing further tilting”. Today, of course, all cars have it over the driver's right shoulder.
The BS had set ‘good’, ‘better’ and ‘super’ standards at that time. BMC, Ford and Rootes all recommended good ‘approved extra’ seatbelts.
We then went on to detail the various aftermarket seatbelts on the market at the time, which can be read in full in the pictures below.