Patent ID: 9333943
Filing Date: 2016-05-10
CPC Classification: B60R

Claim Text:
1. A webbing take-up device comprising: a spool to which a length direction base end side of a webbing is anchored, and that takes up and stores the webbing by rotating in a take-up direction; a sun gear that rotates integrally with the spool or that rotates according to the spool; an internal-toothed gear that is provided coaxially to the sun gear and to the outside of the sun gear; a planet gear that is provided at one lateral side of the sun gear, that directly meshes with both the sun gear and the internal-toothed gear, and to which rotation of the sun gear is transmitted such that the planet gear revolves around the sun gear while rotating about a rotation axis of the planet gear, a reduction ratio being set such that a number of revolutions of the planet gear is less than one revolution for a number of rotations of the spool that is required from a specific take-up state in which a specific length of the webbing is taken up on the spool to reach a fully pulled-out state in which the webbing is completely pulled out from the spool; a locking mechanism that is actuated to restrict rotation of the spool in a pull-out direction that is the opposite direction from the take-up direction while permitting rotation of the spool in the take-up direction; a switching section that is capable of coaxial relative rotation with respect to the sun gear, that rotatably supports the planet gear, that rotates relative to the sun gear due to revolution of the planet gear, that actuates the locking mechanism due to the switching section reaching a rotation position thereof corresponding to the fully pulled-out state of the spool, and that releases actuation of the locking mechanism due to the switching section reaching a rotation position corresponding to the specific take-up state of the spool; and a restriction member that is provided at another lateral side of the sun gear, that is configured such that rotation of the sun gear is not transmitted to the switching section, and that causes the sun gear to follow displacement of the internal-toothed gear with respect to the sun gear along a rotation radial direction of the sun gear, wherein the restriction member does not directly mesh with the internal-toothed gear.