US 7,883,045 B2Granted

Webbing retracting device

AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho

InventorKazuhiro Yamada

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Abstract

An inertial (mass) body is relatively rotatably provided on a V gear. Further, a ring is provided at the outer peripheral side of the V gear so as to be rotatable and displacable in the rotational radial direction of the V gear. When the V gear is suddenly rotated with a spool, the mass relatively pivots to the side opposite to the side of the pull out direction, and displaces to the outside in the rotational radial direction of the V gear. By doing so, an inner peripheral portion of the ring contacts with an outer peripheral portion of the V gear, and the ring rotates with the V gear. Due to this a pressing portion provided at an outer peripheral portion of the ring displaces an interlocking pawl, meshing the interlocking pawl with ratchet teeth on an outer peripheral portion of the V gear.

Claims5

Dependent claims

A webbing retracting device comprising:

a spool having a proximal end portion of a long band-shaped webbing belt attached thereto, the spool taking up and storing the webbing belt when rotated in a take up direction that is one direction about the spool axis, and the webbing belt being pulled out by pulling the webbing belt toward the distal end side thereof such that the spool is rotated in a pull out direction that is a direction opposite to the take up direction;
a first rotational body, the first rotational body being coaxially and integrally rotatable with the spool;
a ring member encircling the first rotational body, the ring member being rotatable and being able to be displaced in a radial direction between a separation position, in which an inner peripheral portion of the ring member is separated from an outer peripheral portion of the first rotational body, and a contact position, in which the inner peripheral portion of the ring member is in contact with the outer peripheral portion of the first rotational body;
a ring member moving mechanism including an inertial body that, in an inertial movement condition due to sudden rotation of the first rotational body, moves the ring member from the separation position to the contact position, wherein the inertial body is supported by the first rotational body so as to be relatively pivotable with respect to the first rotational body;
in the inertial movement condition, the inertial body relatively pivots with respect to the first rotational body and displaces toward the outside in the radial direction of the first rotational body, moving the ring member to the contact position;
and when not in the inertial movement condition, the inertial body is out of contact with the ring member;
a second rotational body that is coaxially relatively rotatable with respect to the spool;
an interlocking member axially supported on the second rotational body and configured to be rotatable between a position of engagement with an outer peripheral portion of the ring member and a position in which the engagement is released, the interlocking member, due to the ring member rotating in the pull out direction, being rotated and engaging with the ring member when the ring member displaces to the contact position, and rotating the second rotational body in the pull out direction;
and
a lock mechanism including a third rotational body that is connected to and integrally rotated with the spool, and a pawl member having a pawl portion that is engagable with the third rotational body, the lock mechanism being configured such that due to the rotation of the second rotational body in the pull out direction, a portion of the second rotational body abuts and rotates the pawl member such that the pawl portion engages with the third rotational body, whereby rotation of the third rotational body is restricted,
wherein the ring member is movable relative to the second rotational body in a radial direction due to a resilient member being disposed therebetween.

8 more elements

Dependencies are inferred from the claim text.

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Abstract

A webbing retracting device comprising:

a spool having a proximal end portion of a long band-shaped webbing belt attached thereto, the spool taking up and storing the webbing belt when rotated in a take up direction that is one direction about the spool axis, and the webbing belt being pulled out by pulling the webbing belt toward the distal end side thereof such that the spool is rotated in a pull out direction that is a direction opposite to the take up direction;
a first rotational body, the first rotational body being coaxially and integrally rotatable with the spool;
a ring member encircling the first rotational body, the ring member being rotatable and being able to be displaced in a radial direction between a separation position, in which an inner peripheral portion of the ring member is separated from an outer peripheral portion of the first rotational body, and a contact position, in which the inner peripheral portion of the ring member is in contact with the outer peripheral portion of the first rotational body;
a ring member moving mechanism including an inertial body that, in an inertial movement condition due to sudden rotation of the first rotational body, moves the ring member from the separation position to the contact position, wherein the inertial body is supported by the first rotational body so as to be relatively pivotable with respect to the first rotational body;
in the inertial movement condition, the inertial body relatively pivots with respect to the first rotational body and displaces toward the outside in the radial direction of the first rotational body, moving the ring member to the contact position;
and when not in the inertial movement condition, the inertial body is out of contact with the ring member;
a second rotational body that is coaxially relatively rotatable with respect to the spool;
an interlocking member axially supported on the second rotational body and configured to be rotatable between a position of engagement with an outer peripheral portion of the ring member and a position in which the engagement is released, the interlocking member, due to the ring member rotating in the pull out direction, being rotated and engaging with the ring member when the ring member displaces to the contact position, and rotating the second rotational body in the pull out direction;
and
a lock mechanism including a third rotational body that is connected to and integrally rotated with the spool, and a pawl member having a pawl portion that is engagable with the third rotational body, the lock mechanism being configured such that due to the rotation of the second rotational body in the pull out direction, a portion of the second rotational body abuts and rotates the pawl member such that the pawl portion engages with the third rotational body, whereby rotation of the third rotational body is restricted,
wherein the ring member is movable relative to the second rotational body in a radial direction due to a resilient member being disposed therebetween.

8 more elements