In article >, Steve W. > wrote:
wrote:
>> Cars I have driven had explosive pre-tensioners. I learned there was also
>> mechanical spring pre-tensioners. Which vehicles used these?
>
>Usually those are only in the bargain basement vehicles not sold in the US.

The first cars I drove with seatbelts had no mechanism at all, you just
adjusted the shoulder belt to fit you and it didn't move in or out. People
hated them.

For many years, seatbelt systems used a ratchet retractor gadget that
allowed the seatbelts to be pulled out slowly but they would stop if they
were pulled out too quickly.

I don't know of any mechanical pretensioners, although I would not be
surprised if they existed in the transition period between retracting belts
and the modern explosive pretensioner.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."