Patent ID: 9090226
Filing Date: 2015-07-28
Classification: B60R

Abstract:
1. A webbing take-up device comprising: a spool, including a spool body to which a proximal end side in a longitudinal direction of a long-belt-like webbing belt is connected and which takes up the webbing belt from the proximal end side thereof by rotation of the spool body in a take-up direction that is one direction about a central axis line of the spool body, a fitting shaft section being provided at the spool body at one end section in an axial direction of the spool body, the fitting shaft section being coaxial and integral with the spool body; an adapter provided at a lateral side of the one end section in the axial direction of the spool body, the adapter including a fitting hole section into which the fitting shaft section can be fitted in a state in which a phase of the fitting hole section matches a phase of the fitting shaft section about the central axis line, relative rotation of the adapter with respect to the fitting shaft section about the central axis line being regulated in a state in which the fitting shaft section is fitted into the fitting hole section; and a spring assembly including a housing that is provided so as to face the one end section in the axial direction of the spool body along the axial direction of the spool body and that accommodates the adapter at an inner side thereof in a state in which an opening side of the fitting hole section of the adapter is externally exposed such that the housing supports the adapter rotatably about the central axis line, a spring being provided inside of the housing, one end of the spring being connected to the housing and another end of the spring being connected to the adaptor, an urging force of the spring in the take-up direction being increased by the adapter being rotated in a pull-out direction that is opposite to the take-up direction, wherein a guide section is provided on at least one of the adapter or the spool, the guide section pressing the adapter in the pull-out direction or the guide section being pressed by the fitting shaft section in the pull-out direction when a leading end side of the fitting shaft section intrudes into the fitting hole section in a state in which the phase of the fitting shaft section diverges from the phase of the fitting hole section, whereby, by a force of the pressing, the guide section causes the adapter to rotate relatively in only one direction with respect to the fitting shaft section in the pull-out direction to a rotational position at which the fitting shaft section can be fitted into the fitting hole section, wherein the fitting shaft section includes: a shaft-section body which is coaxial with the spool body; and a plurality of shaft-section-side protrusions formed so as to project from an outer peripheral section of the shaft-section body with an interval therebetween about the central axis line, and the adapter includes: a hole-section body having an inner diameter dimension that is larger than an outer diameter dimension of the shaft-section body and which can accommodate the shaft-section body and the plurality of shaft-section-side protrusions at an inner side thereof; and a plurality of hole-section-side protrusions formed so as to project from an inner peripheral section of the hole-section body, in a state in which the shaft-section-side protrusions intrude into the hole-section body, the hole-section-side protrusions facing the shaft-section-side protrusions about the central axis line and interfering with the shaft-section-side protrusions, whereby the relative rotation of the fitting shaft section with respect to the adapter is regulated, and wherein a shaft-section-side inclined surface which is inclined toward a pull-out direction side is formed at an end section of the shaft-section-side protrusions, the end section facing a leading end side of the shaft-section body, and the guide section is configured so as to include the shaft-section-side inclined surface, and wherein an engagement section is formed in the adapter, the engagement section regulating the rotation of the adapter in the take-up direction as a result of a surface of the engagement section facing the take-up direction being interfered with by a stopper that is provided so as to be attachable to and removable from the adapter and the housing.