Seat frame

Abstract

To reduce the weight of a cross member bridged between right and left sides of a seat frame. A seat frame includes an upper frame forming an upper portion of a seat back frame, and a cross member bridged at the upper frame. The cross member includes right and left end portions in a seat width direction, the right and left end portions being fixed to the upper frame; and a first recessed portion that is recessed upward or downward and provided between the right and left end portions. The first recessed portion is provided at a center portion of the cross member in the seat width direction.

1 . A seat frame of a vehicle seat, comprising:
 an upper frame forming an upper portion of a seat back frame; and   a cross member bridged at the upper frame,   wherein the cross member includes
 right and left end portions in a seat width direction, the right and left end portions being fixed to the upper frame, and 
 a first recessed portion that is recessed upward or downward and provided between the right and left end portions. 
   
     
     
         2 . The seat frame according to  claim 1 , wherein
 the first recessed portion is provided at a center portion of the cross member in the seat width direction.   
     
     
         3 . The seat frame according to  claim 1 , wherein
 the cross member includes a reinforcement portion formed at the first recessed portion.   
     
     
         4 . The seat frame according to  claim 3 , wherein
 the cross member includes wide portions provided on right and left sides of the first recessed portion in the seat width direction, and   the reinforcement portion is formed across the first recessed portion and both of the wide portions.   
     
     
         5 . The seat frame according to  claim 4 , wherein
 the cross member is provided with a through-hole.   
     
     
         6 . The seat frame according to  claim 5 , wherein
 the through-hole is formed at each wide portion.   
     
     
         7 . The seat frame according to  claim 6 , wherein
 the through-hole is formed at the reinforcement portion at each wide portion.   
     
     
         8 . The seat frame according to  claim 4 , wherein
 at least part of each wide portion is curved to protrude backward.   
     
     
         9 . The seat frame according to  claim 1 , further comprising:
 a second recessed portion different from the first recessed portion, the second recessed portion being provided at least at one of an upper or lower end of the cross member.   
     
     
         10 . The seat frame according to  claim 1 , further comprising:
 a flange portion provided at least at one of an upper or lower end of the cross member,   wherein the flange portion is formed at a position facing the first recessed portion in an upper-to-lower direction.