Patent ID: 9555766
Date: 2017-01-31
CPC Classifications: B60R

Claim:
1. A seatbelt retractor comprising: a frame; a seatbelt; a spool that takes up the seatbelt, the spool being rotatably supported by the frame; a lock mechanism that allows the spool to rotate in a non-activated state and restricts, upon being activated, the spool from rotating in a seatbelt withdrawal direction; and an energy absorption mechanism that limits a load applied to the seatbelt to thereby absorb and alleviate energy of an occupant, wherein the energy absorption mechanism includes: a first torsion bar concentrically enclosed in the spool with one end portion retained by the spool and an opposite end portion disposed to be locked by the lock mechanism, and disposed to be rotated by torsional force; a second torsion bar eccentrically enclosed in the spool with one end portion disposed to be locked by the lock mechanism, and disposed to be rotated by torsional force; and a moving member that rotates interlocked with the spool, and moves between a first position for retaining an opposite end portion of the second torsion bar and a second position spaced from the opposite end portion of the second torsion bar.