Patent ID: 8646717

Claim:
A seat belt retractor comprising: a housing constituting a main body of the seat belt retractor; a guide drum rotatably installed in the housing; a connector inserted into one side of the guide drum; a base member surrounding the connector, a gear member inserted into the base member, a cylinder for operating the gear member, a torsion bar inserted into the guide drum; a locking member fixedly inserted between the torsion bar and the guide drum; a locking clutch installed at one surface of the locking member; a mechanism cover installed at one surface of the locking clutch; and a spring installed between the mechanism cover and the locking clutch, the spring being a leaf spring, a lock arm attached to the locking clutch for rotational movement about a center of rotation of the lock arm, the spring having one end engaging to the locking clutch and another end engaging the lock arm, whereby the spring biases the lock arm into a position where an end of the lock arm is disengaged from a portion of the mechanism cover; a plurality of cylindrical clutch rollers moveably connected to the base member, wherein the plurality of clutch rollers are configured to be moved outward by rotation of the gear member to be meshed with the connector; wherein with respect to a center inner diameter, one surface of the base member is coupled to the gear member, and another surface of the base member is connected to the connector; wherein the base member includes roller retainers into which the clutch rollers are inserted and maintained in a spaced apart relationship, and each of the roller retainers extending from a surface of a flange defining the center inner diameter of the base member, the roller retainers having a generally cylindrical hollow part with a first opening facing the center inner diameter of the base member and through which a portion of the clutch roller extends, the roller retainers having a second opening opposite the first opening and through which the clutch roller is inserted into the hollow part of the roller retainer, the second opening being larger than the first opening, and a connection part extending between the first and second openings and over the clutch roller.