Seat suspension

A vehicle seat comprising:

• a) a backrest portion;
• b) a seat portion connected to the backrest portion and having a suspension base and a seat frame;
• and
• c) a suspension disposed within one of the backrest portion or the seat portion, the suspension comprising:
• i) an actuating mechanism secured to the seat pan and engaged with the frame of the seat portion;
• ii) a first spring connected between the actuating mechanism and a first anchor spaced from the actuating mechanism;
• iii) a transfer link connected to the actuating mechanism;
• iv) a second spring connected between the transfer link and a second anchor;
• v) an adjustment mechanism moveably connected to the transfer link between the actuating mechanism and the second spring, the adjustment mechanism including a pivot pin engaged with the transfer link and moveable along the transfer link to vary the position of the pivot pin with regard to the transfer link;
• and
• vi) a non-adjustable rate damper connected between the transfer link and the adjustment mechanism, wherein the adjustment mechanism comprises a handle disposed on the exterior of the seat, and a weight adjust arm connected to the handle and the pivot pin opposite the handle.

A suspension for a seat capable of varying the spring preload, the spring rate and the damping rate of the suspension in proportion to a suspended mass on the seat, the suspension comprising:

• i) an actuating mechanism engageable with a seat portion or backrest portion of the seat;
• ii) a first spring connectable between the actuating mechanism and the seat;
• iii) a transfer link connected at one end to the actuating mechanism;
• iv) a second spring connectable to the transfer link opposite the actuating mechanism and to the seat;
• v) an adjustment mechanism movably connectable to the seat and engageable with the transfer link between the actuating mechanism and the second spring, the adjustment mechanism including a pivot pin engaged with the transfer link and movable along the transfer link to vary the position of the pivot pin with regard to the transfer link;
• and
• vi) a non-adjustable rate damper having a first end connected to the transfer link and a second end connected to the adjustment mechanism.