[MBZ] Seat belt tensioners

[RELNGSON]

 Seriously I am interested to know how they function, are there sensors 
 which
 detect the crumple zone crumpling or is there a sensor in the seat belt
 mechanism which can tell when an emergency situation exists?
 
Same sensor that deploys the airbag.

RLE
 
 

Re: [MBZ] Seat belt tensioners

[mykd1]

I'm not totally versed on this subject, but I am aware of two types of seatbelt 
tensioners. There are passive and active, both of which respond in the same 
manner. Passive tensioners work when you hit the brakes and lock preventing any 
forward movement of your body. Ever try pulling on your seatbelt to belt up and 
having it lock up on you? Then you have to release it again, thats a passive 
tensioner. Active tensioners work almost the same way except they actually have 
a system that pulls back on the seatbelt say during a accident when the airbag 
has been deployed. Many of the new high end cars like Mercedes, BMW, Lexus, 
etc. have active tensioners. I believe they have some sort of motor that works 
on a sensor to detect a accident or when the airbags have blown. Hope this 
helps  
 
Harry
69 280 SEL 120,000 Miles
72 350SL   108,000 Miles
2004 VW Passat 4 Motion
1999 Mazda Miata   
 
 
-Original Message-
From: [EMAIL PROTECTED]
To: mercedes@okiebenz.com
Sent: Wed, 30 Aug 2006 7:32 PM
Subject: [MBZ] Seat belt tensioners


 Seriously I am interested to know how they function, are there sensors 
 which
 detect the crumple zone crumpling or is there a sensor in the seat belt
 mechanism which can tell when an emergency situation exists?
 
Same sensor that deploys the airbag.

RLE
 
 

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Re: [MBZ] Seat belt tensioners

[JFreezn]

 
 Seriously I am interested to know how they function, are  there sensors 
 which
 detect the crumple zone crumpling or is  there a sensor in the seat belt
 mechanism which can tell when an  emergency situation exists?
  Same sensor that deploys the airbag.

 
 



Some seat belt pretensioners fire an explosive cartridge and the expanding  
gas winds the seat belt tighter.  If your late model Mercedes convertible  
suspension goes full extention on all four wheels (either flying or upside  
down)  
the normally retracted roll bar is also  fired into  position.
 
Belts can be pretensioned by the same collision sensors that fire the air  
bags, OR by unusual G-forces measured by the anti-skid sensors and  computer.   

Jim  Friesen
Phoenix AZ
79 300SD, 262 K miles 
98 ML 320, 145 K  miles