Vehicle seat and method for controlling sitting position using the same

A vehicle seat configured to adjust a position of a seat cushion by a multi-bar link provided at each of both sides of the seat cushion, wherein:

• the multi-bar link is a four-bar link comprising the one seat cushion frame, the front link, the rear link, and a fixed part positioned beneath the one seat cushion frame and pivotably connected to the front and rear links:
• one end of the front link and one end of the rear link are connected to the fixed part so as to slide in a longitudinal direction of a vehicle through respective front and rear guides:
• and
• the drive device rotates the one seat cushion frame about a predetermined point between both ends of the one seat cushion frame,
• a drive source gear, one end of which is connected to a rotatable drive source;
• and
• a seat cushion frame gear provided at the one seat cushion frame to engage with the drive source gear, the one seat cushion frame gear allowing the multi-bar link to rotate by rotation of the drive source gear.

A vehicle seat configured to adjust a position of a seat cushion by a multi-bar link provided at each of both sides of the seat cushion, wherein:

• the multi-bar link comprises one seat cushion frame of plurality of seat cushion frames forming both side frames of the seat cushion, and front and rear links pivotably connected to the respective front and rear of the one seat cushion frame;
• the vehicle seat comprises a drive device configured to rotate the multi-bar link such that an end of the front link connected to the one seat cushion frame is lifted up and an end of the rear link connected to the one seat cushion frame is simultaneously moved down, wherein:
• the rear link includes a first rear link pivotably connected to the one seat cushion frame, and a second rear link, one end of which is selectively pivotably connected to the first rear link while the other end thereof is selectively pivotably connected to a fixed part positioned beneath the one seat cushion frame;
• the multi-bar link is a five-bar link comprising the one seat cushion frame, the front link, the first rear link, the second rear link, and the fixed part pivotably connected to the front link;
• the drive device comprises a drive source gear, one end of which is connected to a rotatable drive source, and a rear link gear provided at the first rear link to engage with the drive source gear, the rear link gear allowing the five-bar link to rotate by rotation of the drive source gear;
• when the seat cushion is tilted, a connection between the second rear link and the fixed part is switched so as not to pivot and a connection between the first rear link and the second rear link is switched so as to pivot;
• and
• when a height of the seat cushion is adjusted, the connection between the second rear link and the fixed part is switched so as to pivot and the connection between the first rear link and the second rear link is switched so as not to pivot.