Seat for motor vehicles

A seat for motor vehicles having an elevation mechanism for the front side of the seat, which comprises:

• a base frame adapted to be arranged on a floor surface of a vehicle body, said base frame having a front section and a rear section;
• a cushion frame having front and rear portions, the rear portion of said cushion frame being supported rockably on the rear section of said base frame;
• a control shaft rotated by drive means;
• a bell crank having two rocking ends, said bell crank being rockably supported on the front section of said base frame, with one of said rocking ends being coupled with the front section of said cushion frame;
• crank means for imparting the rotation of said control shaft to said bell crank in a manner such that during one rotation of said crank means, said bell crank performs one rocking motion, said crank means having a crank pin;
• and
• coupling means having two ends, and one of said ends being coupled with the crank pin of said crank means and the other of said ends being coupled with the other rocking end of said bell crank.

A seat for motor vehicles having elevation mechanisms for rear and front sides of the seat, which comprises:

• a base frame adapted to be arranged on a floor surface of a vehicle body, said base frame having a front section and a rear section;
• a cushion frame having front and rear portions, the front and rear portions of said cushion frame being supported rockably on the front and rear sections of said base frame, respectively;
• a first control shaft rotated by first drive means;
• a first bell crank having two rocking ends, said first bell crank being rockably supported by the rear section of said base frame, one of said rocking ends being coupled with the rear portion of said cushion frame;
• first crank means for imparting the rotation of said first control shaft to said first bell crank in a manner such that during one rotation of said first crank means said first bell crank performs one rocking motion, said first crank means having a crank pin;
• first coupling means having two first ends, one of said first ends being coupled with said crank pin of said first crank means and the other of said first ends being coupled with the other rocking end of said first bell crank;
• a second control shaft rotated by second drive means;
• a second bell crank having two rocking ends, said second bell crank being rockably supported by the front section of said base frame, one of said rocking ends being coupled with said cushion frame;
• second crank means for imparting the rotation of said second control shaft to said second bell crank in a manner such that during one rotation of said second crank means, said second bell crank perform one rocking motion, said second crank means having a crank pin;
• and
• second coupling means having two second ends, one of said second ends being coupled with said second crank pin of said second crank means and the other second end being coupled with the other rocking end of said second bell crank.