US 6,883,742 B2 · Webbing retractor

Abstract

A webbing retractor includes a take-up shaft, an inertia plate provided integrally and coaxially with the take-up shaft, and an inertial force imparting mechanism. When a webbing for restraining a vehicle occupant is suddenly pulled-out, the take-up shaft takes-up the webbing, and the inertia plate causes a rotational delay with respect to the take-up shaft, and rotation of the take-up shaft in a webbing pull-out direction is thereby locked. Further, the inertial force imparting mechanism that suppresses and deters rotation of the inertia plate in a webbing take-up rotation direction by the inertial force imparting mechanism applying inertial force in a webbing pull-out rotation direction to the inertia plate which attempts to rotate in a webbing take-up direction even after rotation of the take-up shaft in the webbing take-up rotation direction has stopped when a vehicle occupant cancels an applied state of the webbing and the entire webbing is taken-up.

Claims16

Dependent claims

A webbing retractor comprising:

a take-up shaft taking-up a webbing in a form of a roll by urging force;
an inertia plate provided integrally and coaxially with an axial end side of the take-up shaft;
and
an inertial force imparting mechanism,
wherein in a case in which a webbing for restraining a vehicle occupant is suddenly pulled-out, the take-up shaft unwinds the webbing, and the inertia plate causes a rotational delay with respect to the take-up shaft, and rotation of the take-up shaft in a webbing pull-out direction is thereby locked, and
the inertial force imparting mechanism one of suppresses and deters rotation of the inertia plate in a webbing take-up rotation direction by directly contacting and directly applying an inertial force to the inertia plate in a webbing pull-out rotation direction when said inertia plate attempts to rotate in a webbing take-up direction due to inertial force even after rotation of the take-up shaft in the webbing take-up rotation direction has stopped when a vehicle occupant cancels an applied state of the webbing and an entire amount of the webbing is taken-up onto the take-up shaft by the urging force.

3 more elements

A webbing retractor comprising:

a take-up shaft taking-up a webbing for restraining a vehicle occupant;
a frame which is fixed to a vehicle and which rotatably supports both end portions of the take-up shaft, and lock teeth are formed at surfaces of the frame which surfaces intersect the end portions of the take-up shaft;
a lock plate provided at at least one end portion side of the take-up shaft, and able to move between a position of engagement with the lock teeth and a position of non-engagement with the lock teeth, and due to the lock plate engaging with the lock teeth, the lock plate impedes rotation of the take-up shaft in a webbing pull-out direction;
a lock wheel provided coaxially at one end portion side of the take-up shaft, the lock wheel usually rotating integrally with the take-up shaft and holding the lock plate at the position of non-engagement, and when relative rotation arises between the take-up shaft and the lock wheel, the lock wheel moves the lock plate to the position of engagement;
a lock operating mechanism provided integrally and coaxially with an axial end side of the take-up shaft, and having an inertia plate which is provided so as to be swingable, and stopping rotation of the take-up shaft in a webbing pull-out rotation direction;
and
an inertial force imparting mechanism which one of suppresses and deters rotation, in a webbing take-up rotation direction, of the inertia plate which attempts to rotate in a webbing take-up direction due to inertial force even after rotation of the take-up shaft in the webbing take-up direction has stopped, wherein said mechanism directly contacts and directly applies an inertial force to the inertia plate.

4 more elements

Dependencies are inferred from the claim text.

Webbing retractor

Life of this patent

Webbing retractor

Life of this patent

Abstract

Claims16