Seat structure

A seat structure for a vehicle seat, comprising:

• a support member pivotally mounted in a support structure of the seat structure for pivotal movement between a raised position in which the support member supports the upholstered cover in a raised state, and a lowered position in which the upholstered cover is no longer supported in the raised state;
• a first strut member pivotally connected to the support member;
• a second strut member pivotally connected to the first strut member to form with the first strut member an over-centre strut which, when in an over-centre position, holds the support member in the raised state;
• and
• two powered actuators provided on opposite sides of the over-centre strut, one actuator being operable to press against the over-centre strut in order to trip it from the over-centre position and the other actuator being operable to press against the over-centre strut in order to trip it into the over-centre position.

A seat structure for a vehicle seat, comprising:

• a support member pivotally mounted in a support structure of the seat structure for pivotal movement between a raised position in which the support member supports the upholstered cover in a raised state, and a lowered position in which the upholstered cover is no longer supported in the raised state;
• a first strut member pivotally connected to the support member;
• a second strut member pivotally connected to the first strut member, the first and second strut members configured to form an over-centre strut which, in an over-centre position, holds the support member in the raised state;
• and
• at least one inflatable bladder provided for tripping the over-centre strut from the over-centre position to allow the support member to move from the raised position to the lowered position.