Webbing retractor

A webbing retractor comprising:

• a spool around which a webbing is wound in such a manner as to be capable of being pulled out;
• an energy absorbing member which is deformed by said spool when a rotating force acting in a pulling-out direction of the webbing is applied to said spool at the time of a sudden deceleration of a vehicle, so as to prevent an increase in a tensile force of the webbing;
• a pretensioner which is connected to said spool when a deceleration of a predetermined value or more is applied, so as to rotate said spool in a taking-up direction of the webbing;
• and
• a canceling portion including a yieldable portion of said energy absorbing member disposed between said spool and said pretensioner so as to cancel the stopping of rotation in a paying-out direction of the webbing by said pretensioner if a deforming force applied to said energy absorbing member by the rotating force in the pulling-out direction of the webbing exceeds a predetermined value after operation of said pretensioner.

A webbing retractor comprising:

• a spool around which a webbing is wound in such a manner as to be capable of being pulled out;
• a pretensioner which is connected to said spool when a deceleration of a predetermined value or more is applied, so as to rotate said spool in a taking-up direction of the webbing;
• an energy absorbing member which is inserted into said spool coaxially therewith, wherein a prismatic portion at one end of said energy absorbing member is engaged with an inertial lock mechanism which responds to an acceleration, an inserting portion at another end of said energy absorbing member is engaged with said pretensioner, an engaging portion adjacent to said inserting portion is engaged with said spool, a portion between said inserting portion and said engaging portion serves as a breakable portion, and a portion between said engaging portion and said prismatic portion at said one end serves as an energy absorbing portion which is deformed by said spool when a rotating force acting in a pulling-out direction of the webbing is applied to said spool at the time of a sudden deceleration of a vehicle, so as to prevent an increase in a tensile force of the webbing;
• and
• a canceling portion including said breakable portion disposed between said spool and said pretensioner so as to cancel the stopping of rotation in a paying-out direction of the webbing by said pretensioner after operation of said pretensioner.