Lifter for automotive seat

A lifter for an automotive seat, in which the seat includes a seat frame and slide rail device, comprising:

• a drive means disposed between said seat frame and slide rail, said drive means including a link means;
• a drive shaft adapted to impart a drive force to said drive means;
• a housing equipped with an operation lever, said housing being rotatably provided on said drive shaft;
• a gear provided in said housing and fixedly connected via a non-reversible brake device to said drive shaft;
• a first pawl member rotatably provided in said housing, said first pawl member being disposed such as to be engageable with one side of said gear, to thereby permit said gear to be rotated in a first direction;
• a second pawl member rotatably provided in said housing, said second pawl member being disposed such as to be engageable with the other side of said gear, to thereby permit said gear to be rotated in a second direction opposite to said first direction;
• a switch-over cam provided in said housing, said switch-over cam being adapted to bring either of said first and second pawl member into engagement with said gear,
• whereby rotation of said operation lever causes said drive shaft to rotate in either of said first and second directions and thus impart said drive force therefrom to said drive means so as to adjustably raise or lower said seat.