US 11,654,861 B2
Seat belt fastened/unfastened state detection switch
Kenjiro Desaki, Osaka (JP)
Assigned to HOSIDEN CORPORATION, Osaka (JP)
Filed by HOSIDEN CORPORATION, Osaka (JP)
Filed on Feb. 26, 2021, as Appl. No. 17/186,395.
Claims priority of application No. JP2020-072848 (JP), filed on Apr. 15, 2020.
Prior Publication US 2021/0323500 A1, Oct. 21, 2021
Int. Cl. B60R 22/48 (2006.01); B60R 22/18 (2006.01)
CPC B60R 22/48 (2013.01) [B60R 22/18 (2013.01); B60R 2022/1806 (2013.01); B60R 2022/4883 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A seat belt fastened/unfastened state detection switch comprising:
a printed substrate that includes a circuit for detecting a fastened/unfastened state of a seat belt;
a rotor that is rotatably attached to the printed substrate, wherein the rotor includes:
a contact portion, the contact portion coming into contact with a tongue of the seat belt, and rotates in a forward direction in accordance with pushing of the tongue into a buckle;
a first protrusion that limits rotation in the forward direction; and
a second protrusion that limits rotation in the reverse direction;
a spring that makes the rotor, the rotor being in a rotated state in the forward direction, rotate in a reverse direction in accordance with pulling of the tongue from the buckle; and
an electric brush that is attached to a surface of the rotor, the surface facing the printed substrate, and includes a leg portion whose contact/non-contact state with respect to a conductive part of the circuit changes depending on a rotation state of the rotor,
wherein the printed substrate further includes:
a first groove to which the first protrusion is fitted when the rotor is at a predetermined limited angle in the rotation in the forward direction; and
a second groove to which the second protrusion is fitted when the rotor is at a predetermined limited angle in the rotation in the reverse direction.