Seat height gear system and seat having the same

A seat comprising:

• a seat height gear system comprising a rack bar engaged with a pinion, the pinion configured to be rotated by a motor fixed to a lower post of a monopost apparatus with the rack bar being fixed to an upper post, the upper post being coupled to the lower post, and the upper post being configured to move with a height rail by a linear motion of the rack bar due to the rotation of the pinion in a height operation section, the height operation section being configured to adjust the height of a seat;
• and
• a gas spring interlocked with the upper post to compensate for upper/lower operating forces in the height operation section and configured to perform a buffering operation,
• wherein a pair of left/right height rails are positioned between a lower bracket of the lower post and an upper bracket of the upper post, each of the left/right height rails include a “⊂” shaped bracket, the pair of left/right height rails being configured to move with the upper bracket of the upper post during a height movement of the rack bar, and
• wherein the rack bar includes a rack flange by which a rack tooth of the rack bar is surrounded, and the rack flange has a rectangular spatial portion structure configured to accommodate a support rod or a holder rod connected with the lower bracket of the lower post.

A seat height gear system comprising:

• a monopost apparatus configured to be mounted under a seat, the monopost apparatus comprising a lower post and an upper post;
• and
• a direct drive motor apparatus within the monopost apparatus, the direct drive motor apparatus comprising a motor and a gear unit, the gear unit comprising a pinion and a rack bar, the rack bar being configured to be engaged with the pinion, the motor being fixed to the lower post of the monopost apparatus, the pinion being coupled to the motor, the rack bar being fixed to an upper post of the monopost apparatus, the motor being configured to rotate the pinion, and the rack bar being configured to convert the rotation of the pinion into linear motion,
• wherein a pair of left/right height rails are positioned between a lower bracket of the lower post and an upper bracket of the upper post, each of the left/right height rails include a “⊂” shaped bracket, the pair of left/right height rails being configured to move with the upper bracket of the upper post during a height movement of the rack bar, and
• wherein the rack bar includes a rack flange by which a rack tooth of the rack bar is surrounded, and the rack flange has a rectangular spatial portion structure configured to accommodate a support rod or a holder rod connected with the lower bracket of the lower post.