Lumbar support, cushion for seat, and seat structure

A cushion for a seat, integrally formed of a bottom cushion and a back cushion, and used by being mounted on a seat cushion and a seat back of a seat structure, wherein

• the bottom cushion and back cushion are formed from a solid knitted fabric, and a lumbar support is incorporated into the back cushion, which has a front surface,
• wherein the lumbar support comprises;
• a flexible plate made of plastic and having a front surface and a back surface;
• and
• a bulging member provided with two housing parts formed adjacent to each other in the vertical direction of the back cushion, sandwiching a border region and able to house and take out a cushioning material for adjustment in the housing parts, in which said bulging member is supported by bonding the border region on the back surface of said flexible plate, and is incorporated into the back cushion so that the front surface of said flexible plate is positioned on the front surface of the back cushion.

A seat structure provided with a seat cushion and a seat back, wherein a lumbar support is incorporated into a back cushion disposed on the seat back, the back cushion having a front surface,

• wherein the lumber support comprises:
• a flexible plate made of plastic and having a front surface and a back surface;
• and
• a bulging member provided with two housing parts formed adjacent to each other in the vertical direction of the back cushion, sandwiching a border region and able to house and take out a cushioning material for adjustment in the housing parts, in which said bulging member is supported by bonding the border region on the back surface of said flexible plate, and is incorporated into the back cushion so that the front surface of said flexible plate is positioned on the front surface of the back cushion.

A cushion for a seat integrally formed of a bottom cushion and a back cushion, and used by being mounted on a seat cushion and a seat back in a seat structure, wherein the bottom cushion and back cushion are formed from a solid knitted fabric, and an auxiliary cushioning member is incorporated into the bottom cushion, the back cushion having a front surface,

• wherein the auxiliary cushioning member comprises:
• a flexible plate made of plastic and having a front surface and a back surface;
• and
• a bulging member provided with two housing parts formed adjacent to each other in the vertical direction of the back cushion, sandwiching a border region and able to house and take out a cushioning material for adjustment in the housing parts, in which said bulging member is supported by bonding the border region on the back surface of said flexible plate, and is incorporated into the bottom cushion so that the front surface of said flexible plate is positioned on the front surface of the bottom cushion.

A seat structure provided with a seat cushion and seat back, wherein an auxiliary cushioning member is incorporated into a bottom cushion disposed on said seat cushion, the bottom cushion having a front surface,

• wherein the auxiliary cushioning member comprises:
• a flexible plate made of plastic and having a front surface and a back surface;
• and
• a bulging member provided with two housing parts formed adjacent to each other in the vertical direction of the back cushion, sandwiching a border region and able to house and take out a cushioning material for adjustment in the housing parts, in which said bulging member is supported by bonding the border region on the back surface of said flexible plate, and is incorporated into the bottom cushion so that the front surface of said flexible plate is positioned on the front surface of the bottom cushion.