US 12,269,377 B2
Vehicle seatback folding device
Cheol Hwan Yoon, Hwaseong-si (KR); Kyeong Ju Kim, Hwaseong-si (KR); Hwa Young Mun, Hwaseong-si (KR); Jung Bin Lee, Hwaseong-si (KR); and Jun Sik Hwang, Hwaseong-si (KR)
Assigned to HYUNDAI TRANSYS INC., Seosan-si (KR)
Appl. No. 18/022,005
Filed by HYUNDAI TRANSYS INC., Seosan-si (KR)
PCT Filed Aug. 17, 2021, PCT No. PCT/KR2021/010866
§ 371(c)(1), (2) Date Feb. 17, 2023,
PCT Pub. No. WO2022/039464, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 10-2020-0104996 (KR), filed on Aug. 21, 2020.
Prior Publication US 2023/0347797 A1, Nov. 2, 2023
Int. Cl. B60N 2/20 (2006.01); B60N 2/225 (2006.01); B60N 2/30 (2006.01)
CPC B60N 2/20 (2013.01) [B60N 2/2255 (2013.01); B60N 2/3009 (2013.01); B60N 2/3011 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A vehicle seatback folding device comprising:
a cushion bracket integrally coupled to a seat cushion;
a back side frame integrally coupled to a seatback and hinged to the cushion bracket, the back side frame being rotated on the cushion bracket when the seatback is folded or unfolded;
a spring mounting bracket integrally coupled to the back side frame, wherein the spring mounting bracket is configured to rotate with the back side frame around a hinge shaft coupling the cushion bracket and the back side frame;
a restoring spring including a first end and a second end, the first end fixedly coupled to the spring mounting bracket, the second end caught and supported by a fixed support end integrally provided in the cushion bracket, the restoring spring configured to apply elastic restoring force to the back side frame so as to allow the back side frame to be rotated in a folding direction of the seatback; and
a reverse spring including a first end fixedly coupled to the spring mounting bracket and a second end supported while being caught by a first spring support end integrally provided on the back side frame in an unfolded state of the seatback,
wherein the restoring spring and the reverse spring are spiral springs respectively disposed around the hinge shaft coupling the cushion bracket and the back side frame,
wherein the first end of the restoring spring and the first end of the reverse spring are inner ends located radially inwards in a spiral shape of the spring, and
wherein the second end of the restoring spring and the second end of the reverse spring are outer ends located radially outwards in the spiral shape of the spring.