A back frame structure for a vehicle seat includes: a pair of right and left side frames extending in an up-down direction; and a lower frame configured to connect a lower end side of the right side frame and a lower end side of the left side frame, wherein: at least one side frame out of the pair of right and left side frames is fitted to one connection portion, which is a connection portion of the lower frame with respect to the one side frame, so as to form one fitting portion; and the one fitting portion is configured such that a geometrical-moment of inertia along an axis extending to a predetermined first direction gradually increases from an upper part of the one fitting portion to a lower part of the one fitting portion.
BACK FRAME STRUCTURE FOR VEHICLE SEAT
2017-11-30
Patent
Electronic Resource
English