An aircraft seat includes an actuator and a movement transmission device. The transmission device includes a frame provided with an immobilizing portion and a drive shaft. The transmission device further includes a gear wheel provided with coupling teeth having inclined side walls and a sleeve with an immobilizing portion complementary to the immobilizing portion of the frame, and coupling teeth having inclined side walls. The transmission device also has an elastic member configured to push the sleeve. The stiffness of the elastic member and the inclination of the side walls of the coupling teeth of the gear wheel and sleeve are chosen such that, when a torque greater than a threshold torque is applied to the gear wheel, the sleeve slides on the drive shaft from a position of coupling the sleeve to the gear wheel to a position of immobilizing the sleeve relative to the frame.

A vehicle seat assembly includes a seatback rotationally coupled to a base at a seat pivot. A securing pin is coupled with the seatback. An inertial latch is operable about a latch pivot to define an idle position defined by the inertial latch biased distal from the securing pin, and a deployed position defined by an opposing directional force biasing the inertial latch into selective engagement with the securing pin wherein the seatback is maintained in a predetermined rotational position. A guide latch is biased against the inertial latch and having an idle notch and a deployed notch. The idle notch selectively maintains the inertial latch in the idle position. The deployed notch secures the inertial latch in the deployed position in response to the opposing directional biasing force.

A vehicle seat assembly includes a seatback rotationally coupled to a base at a seat pivot. A securing pin is coupled with the seatback. An inertial latch is operable about a latch pivot to define an idle position defined by the inertial latch biased distal from the securing pin, and a deployed position defined by an opposing directional force biasing the inertial latch into selective engagement with the securing pin wherein the seatback is maintained in a predetermined rotational position. A guide latch is biased against the inertial latch and having an idle notch and a deployed notch. The idle notch selectively maintains the inertial latch in the idle position. The deployed notch secures the inertial latch in the deployed position in response to the opposing directional biasing force.

A seat backrest inertial locking system configured to lock a seat backrest in place upon rapid acceleration or deceleration of a vehicle. The locking system includes an inertial mass located on an actuation ring, the inertial mass configured to cause rotation of the actuation ring when a rapid acceleration or deceleration is experienced. Rotation of the actuation ring causes longitudinal movement of a locking member into a receiving slot disposed on a truss of the seat backrest, thereby locking the seat backrest in place.

A seat backrest inertial locking system configured to lock a seat backrest in place upon rapid acceleration or deceleration of a vehicle. The locking system includes an inertial mass located on an actuation ring, the inertial mass configured to cause rotation of the actuation ring when a rapid acceleration or deceleration is experienced. Rotation of the actuation ring causes longitudinal movement of a locking member into a receiving slot disposed on a truss of the seat backrest, thereby locking the seat backrest in place.

The invention mainly relates to a system for the inertial unlocking of a seat back, in particular of an aircraft seat, characterized in that it comprises: a structural element of the seat back, called a connecting rod, a support piece for the fixation to a structural element of said seat, the support piece comprising a flyweight movable in translation between: a locking position in which the flyweight faces a lip of the connecting rod so as to prevent the connecting rod from rotating relative to the support piece about the axis of rotation, and an unlocking position in which the flyweight is released from the lip of the connecting rod so as to allow the connecting rod to rotate relative to the support piece about the axis of rotation, the passage of the flyweight from the locking position to the unlocking position being able to be carried out under the action of a deceleration by the seat.

The disclosure provides for a system that includes a seat mounted in a vehicle. The seat includes a base, a back support, a hinge, and a seat belt integrated into the seat. The back support is capable of rotating relative to the base and thereby reclining. The hinge is between the base and the back support and is configured to lock the back support in positions in relation to the base. The seat belt has a shoulder portion and a lap portion and is attached to the seat at a shoulder anchor in the back support and a base anchor in the base. When a generated torque, created from a forward force applied by the shoulder portion of the seat belt, exceeds a threshold amount of torque, the hinge is configured to unlock and back support is configured to rotate forward from a reclined position towards an upright position.

The disclosure provides for a system that includes a seat mounted in a vehicle. The seat includes a base, a back support, a hinge, and a seat belt integrated into the seat. The back support is capable of rotating relative to the base and thereby reclining. The hinge is between the base and the back support and is configured to lock the back support in positions in relation to the base. The seat belt has a shoulder portion and a lap portion and is attached to the seat at a shoulder anchor in the back support and a base anchor in the base. When a generated torque, created from a forward force applied by the shoulder portion of the seat belt, exceeds a threshold amount of torque, the hinge is configured to unlock and back support is configured to rotate forward from a reclined position towards an upright position.

A seat lock device includes: a hook member; and a cam plate. The hook member includes: a hook inclined edge surface and is rotationally biased by contact with a striker entering; an engaging groove into which the striker entering fits after crossing the hook inclined edge surface to bring the hook member into a locked position; a restraining pin; and an interlock pin, the cam plate is set to a limiting position when the hook member engages with the striker and is switched to an allowing position when the striker enters and when an operation performed to release an engagement of the striker, and the cam plate includes: a cam surface that contacts with the restraining pin to rotationally bias the hook member; and an interlock surface with which the interlock pin contacts when the hook member has turned from the locked position.

A seat lock device includes: a hook member; and a cam plate. The hook member includes: a hook inclined edge surface and is rotationally biased by contact with a striker entering; an engaging groove into which the striker entering fits after crossing the hook inclined edge surface to bring the hook member into a locked position; a restraining pin; and an interlock pin, the cam plate is set to a limiting position when the hook member engages with the striker and is switched to an allowing position when the striker enters and when an operation performed to release an engagement of the striker, and the cam plate includes: a cam surface that contacts with the restraining pin to rotationally bias the hook member; and an interlock surface with which the interlock pin contacts when the hook member has turned from the locked position.