1. Technical Field
The present invention relates to a webbing winding device that constitutes a safety belt device of a vehicle.
2. Related Art
In a so-called vehicle seat belt retractor disclosed in Japanese Utility Model Application Laid-Open (JU-A) No. H06-8122, when a winding shaft rapidly rotates in an extracting direction due to a tension applied to a webbing, a latch cup also rotates in the extracting direction because a lock portion of a lock member meshes with an internal tooth of a latch cup. As such, when the latch cup rotates in such way, an inner peripheral portion of an elongated hole-shaped pole guide formed at the latch cup presses a pole guide protrusion so as to rotate a pole. The rotating pole allows the engagement portion thereof to engage with a latch plate provided in the winding shaft, thereby regulating the rotation of the winding shaft in the extracting direction.
In the above-described configuration in which a protrusion such as the pole guide protrusion is inserted into an elongated hole such as the pole guide hole and an inner peripheral portion of the elongated hole presses an outer peripheral portion of the protrusion portion so as to transmit the movement, it sometimes happens that, for example, if either one provided with the elongated hole (the latch cup of JU-A No. H06-8122) is inclined in a manner such that the opening direction of the elongated hole is inclined with respect to the protruding direction of the protrusion portion, the inner peripheral portion of the elongated hole presses the front end of the protrusion and thus a force acts in a direction in which the one provided with the protrusion (the pole of JU-A No. H06-8122) is forcedly inclined.
In this way, there are cases that the movement may be transmitted from one provided with the elongated hole (the latch cup of JU-A No. H06-8122) to the other one provided with the protrusion (the pole of JU-A No. H06-8122) in the state in which the one provided with the elongated hole and the other one provided with the protrusion are inclined.