Patent ID: 8864173
Filing Date: 2014-10-21
Classification: B60R

Abstract:
1. A seat belt retractor comprising: a spool around which a seat belt is to be retracted; a frame that includes a first sidewall and a second sidewall and supports the spool while allowing rotation of the spool; a first engaging portion that is provided on one end side of the spool and includes a predetermined number of first external teeth that, in a case of an emergency, come into mesh with a predetermined number of first internal teeth provided on the first sidewall, the first engaging portion locking the rotation of the spool in a direction of seat belt withdrawal when the first external teeth have meshed with the first internal teeth; a second engaging portion that is provided on the other end side of the spool and includes a predetermined number of second external teeth that, in a case of an emergency, come into mesh with a predetermined number of second internal teeth provided on the second sidewall, the second engaging portion locking the rotation of the spool in the direction of seat belt withdrawal when the second external teeth have meshed with the second internal teeth; and a spool guide that guides, when the first external teeth have meshed with the first internal teeth and the other end side of the spool is moved in a direction of seat belt load with a load acting on the seat belt, the other end side of the spool in such a direction that any of the second external teeth of the second engaging portion comes into mesh with one target second internal tooth included in the second internal teeth; the second sidewall has a circular hole and the second internal teeth are on an inner circumferential surface extending about the circular hole, the second external teeth of the spool fit with play in the circular hole and some of the second external teeth are meshable with the respective second internal teeth of the second engaging portion on the other end side of the spool that is moved in the direction of seatbelt load with the load acting on the seat belt, the spool guide is provided on the inner circumferential surface extending about the circular hole.