Seat frame

Abstract

The present disclosure describes a seat frame including a waist portion supporting member having a smaller size while stably supporting a waist portion of an occupant. A vehicle seat frame serving as a frame for a vehicle seat includes a seat cushion frame forming a frame of a sitting part of the vehicle seat, a seatback frame forming a frame of a backrest part of the vehicle seat, and a waist portion supporting member coupled to a lower frame which is included in the seatback frame. The waist portion supporting member has a coupling region extending in the seat width direction, the coupling region being coupled to the lower frame, and a waist portion supporting region extending from the coupling region toward the seat cushion frame and supporting a waist portion of an occupant. The waist portion supporting region is longer in the seat width direction than the coupling region.

1 . A seat frame for a conveyance seat, comprising:
 a seat cushion frame forming a frame of a seated part of the conveyance seat;   a seatback frame forming a frame of a backrest part of the conveyance seat; and   a waist portion supporting member coupled to a lower frame which is included in the seatback frame, wherein   the waist portion supporting member has:   a coupling region extending in a seat width direction, the coupling region being coupled to the lower frame; and   a waist portion supporting region extending from the coupling region toward the seat cushion frame and supporting a waist portion of an occupant, and   the waist portion supporting region is longer in the seat width direction than the coupling region.   
     
     
         2 . The seat frame according to  claim 1 , wherein
 the waist portion supporting member has a bent portion formed by bending at least one of end portions of the waist portion supporting member in the seat width direction to an inner side in the seat width direction.   
     
     
         3 . The seat frame according to  claim 2 , wherein
 the bent portion has an extending region extending toward the lower frame.   
     
     
         4 . The seat frame according to  claim 2 , wherein
 the waist portion supporting member has a cutout portion formed around a connection portion between the waist portion supporting region and the bent portion.   
     
     
         5 . The seat frame according to  claim 4 , wherein
 the connection portion has a reinforcing region formed in a shape projecting toward the lower frame.   
     
     
         6 . The seat frame according to  claim 2 , wherein
 the bent portion has a member attachment portion to which a member is attached.   
     
     
         7 . The seat frame according to  claim 3 , wherein
 the lower frame has a forward extending region extending to face the extending region of the bent portion in a lower portion of the lower frame.   
     
     
         8 . The seat frame according to  claim 3 , wherein
 the lower frame has a bead portion extending in the seat width direction and projecting toward the seated part,   the extending region of the bent portion has a recessed portion recessed toward the seated part, and   the recessed portion and the bead portion are arranged at positions to face each other.   
     
     
         9 . The seat frame according to  claim 1 , wherein
 the waist portion supporting member is formed in a shape spreading in the seat width direction from the coupling region toward the waist portion supporting region.   
     
     
         10 . The seat frame according to  claim 1 , wherein
 the waist portion supporting member has a region formed with a recessed and projected edge in a lower portion of the waist portion supporting region.