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Force limiting device in a safety belt retractor

  • US 5,836,534 A
  • Filed: 08/23/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 08/30/1995
  • Status: Expired due to Fees
First Claim
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1. A force limiting device for use in a safety belt retractor, said retractor having a hollow belt spool, a shaft axially extending through said belt spool, a pair of ratchet wheels each connected to one axial end of said shaft, at least one internally threaded nut member coaxially accommodated within and connected to said hollow belt spool for joint rotation and relative axial displacement, said shaft being externally threaded and engaged with said nut member, and a pair of energy dissipating sleeve members of a plastically deformable material being coaxially engaged about said shaft in axial abutment against each other, said nut member, upon relative rotation with respect to said shaft, forcingly and telescopically driving one of said sleeve members into the other of said sleeve members.

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