Clutch-based adjustment mechanism for motorized multi-way seat adjustment An adjustment mechanism comprises multiple screw shafts (111, 112, 113) and a motor (150) for driving the screw shafts. Further, the adjustment mechanism comprises a clutch mechanism (160) for selectively engaging the motor (150) with one or more of the screw shafts (111, 112, 113). A rotation of one or more of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a first degree of freedom. A rotation of one or more others of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a second degree of freedom.

Clutch-based adjustment mechanism for motorized multi-way seat adjustment An adjustment mechanism comprises multiple screw shafts (111, 112, 113) and a motor (150) for driving the screw shafts. Further, the adjustment mechanism comprises a clutch mechanism (160) for selectively engaging the motor (150) with one or more of the screw shafts (111, 112, 113). A rotation of one or more of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a first degree of freedom. A rotation of one or more others of the screw shafts (111, 12, 113) caused by the motor (150) translates into adjustment of the seat according to a second degree of freedom.

A method of controlling tilting movement of a headrest of a seating arrangement of a vehicle, the method comprising: receiving a request for tilting movement of the headrest; determining if the headrest is attached to the seat by checking for the presence of at least one electrical component that is located within the headrest; and operating a tilt motor to commence tilting movement of the headrest in response to the request only if the or each component is found to be present.

A method of controlling tilting movement of a headrest of a seating arrangement of a vehicle, the method comprising: receiving a request for tilting movement of the headrest; determining if the headrest is attached to the seat by checking for the presence of at least one electrical component that is located within the headrest; and operating a tilt motor to commence tilting movement of the headrest in response to the request only if the or each component is found to be present.

An adjustment mechanism for a seat comprises at least one screw shaft (111, 112) and a motor for driving the at least one screw shaft (111, 112). Further, the adjustment mechanism comprises at least one nut element (121, 122) engaged with the at least one screw shaft (121, 122) in such a way that a rotation of the at least one screw shaft (111, 112) caused by the motor translates into a linear motion of the at least one nut element (121, 122). In a first range of the linear motion of the at least one nut element (121, 122) the linear motion translates into adjustment of the seat according to a first degree of freedom, and in a second range of the linear motion of the at least one nut element (121, 122) the linear motion translates into adjustment of the seat according to a second degree of freedom.

An adjustment mechanism for a seat comprises at least one screw shaft (111, 112) and a motor for driving the at least one screw shaft (111, 112). Further, the adjustment mechanism comprises at least one nut element (121, 122) engaged with the at least one screw shaft (121, 122) in such a way that a rotation of the at least one screw shaft (111, 112) caused by the motor translates into a linear motion of the at least one nut element (121, 122). In a first range of the linear motion of the at least one nut element (121, 122) the linear motion translates into adjustment of the seat according to a first degree of freedom, and in a second range of the linear motion of the at least one nut element (121, 122) the linear motion translates into adjustment of the seat according to a second degree of freedom.

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 attachable to a vehicle body, the vehicle seat including: a seat back; and a headrest configured to support a head of a seated occupant, the headrest including: a base portion fixed to the seat back; a slide portion slidable in a left-right direction in a state where the head is supported to the base portion; and an electric mechanism configured to slide the slide portion in the left-right direction, and in which the slide portion is configured to be moved by the electric mechanism in a moving direction in which the head moves in the left-right direction due to acceleration in the left-right direction applied when a vehicle moves, the electric mechanism being operated by a control device disposed in the vehicle body in response to a signal from a sensor disposed in the vehicle body, the sensor being configured to detect the moving direction.

To provide a vehicle seat in which the posture of the head of the occupant is controlled with a simpler configuration to reduce motion sickness of the occupant, the vehicle seat includes: a seat cushion; a seat back; a headrest including a main part configured to support the back of the head of the occupant, a left side part connected to a left edge of the main part to be rotatable about a vertical axis, a right side part connected to a right edge of the main part to be rotatable about a vertical axis, a left drive device for rotating the left side part forward relative to the main part, and a right drive device for rotating the right side part forward relative to the main part; an acceleration acquisition device; and a control device which, when a rightward acceleration is acquired by the acceleration acquisition device, makes the right drive device rotate the right side part forward until the right side part is positioned on a right side of the head of the occupant, and when a leftward acceleration is acquired by the acceleration acquisition device, makes the left drive device rotate the left side part forward until the left side part is positioned on a left side of the head of the occupant.

To provide a vehicle seat in which the posture of the head of the occupant is controlled with a simpler configuration to reduce motion sickness of the occupant, the vehicle seat includes: a seat cushion; a seat back; a headrest including a main part configured to support the back of the head of the occupant, a left side part connected to a left edge of the main part to be rotatable about a vertical axis, a right side part connected to a right edge of the main part to be rotatable about a vertical axis, a left drive device for rotating the left side part forward relative to the main part, and a right drive device for rotating the right side part forward relative to the main part; an acceleration acquisition device; and a control device which, when a rightward acceleration is acquired by the acceleration acquisition device, makes the right drive device rotate the right side part forward until the right side part is positioned on a right side of the head of the occupant, and when a leftward acceleration is acquired by the acceleration acquisition device, makes the left drive device rotate the left side part forward until the left side part is positioned on a left side of the head of the occupant.