| CPC A44B 11/2523 (2013.01) [Y10T 24/45665 (2015.01)] | 7 Claims |
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1. A buckle device into which a tongue plate provided on a seat belt of a vehicle is to be inserted, and for detachably engaging with the inserted tongue plate, the buckle device comprising:
a hollow buckle body;
an operating member configured to be operated in response to a release operation for releasing engagement between the tongue plate and the buckle device, the operating member being supported, in the buckle body, to be slidable in an insertion direction of the tongue plate; and
an inertia member supported, in the buckle body, to be rotatable about a rotation center axis extending in a width direction of the tongue plate,
wherein the inertia member includes:
a main body portion through which the rotation center axis penetrates; and
a first lever and a second lever protruding from the main body portion in a direction away from the rotation center axis, the first lever and the second lever being arranged at a predetermined interval in the insertion direction of the tongue plate when viewed from an extending direction of the rotation center axis,
the first lever is located on an inner side, than the second lever, of the buckle body in the insertion direction of the tongue plate,
in an engaged state of the tongue plate, the operating member is configured to be in contact, at a first contact portion, with the first lever and configured to be in contact, at a second contact portion, with the second lever, the engaged state of the tongue plate being a state where the tongue plate is engaged with the buckle body,
in the engaged state of the tongue plate, the first contact portion and the second contact portion are located between the first lever and the second lever in the insertion direction of the tongue plate,
in a case where the tongue plate is disengaged from the buckle body, the first contact portion and the second contact portion move in a direction away from a position between the first lever and the second lever, in accordance with a rotation of the inertia member,
in a case where a first inertial force in the insertion direction of the tongue plate acts on the operating member in the engaged state of the tongue plate, the first lever applies, to the first contact portion, a first pressing force in a direction opposite to the insertion direction of the tongue plate, the first pressing force being larger than the first inertial force, and
in a case where a second inertial force in the direction opposite to the insertion direction of the tongue plate acts on the operating member in the engaged state of the tongue plate, the second lever applies, to the second contact portion, a second pressing force in the insertion direction of the tongue plate, the second pressing force being smaller than the second inertial force.
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