An air bag includes a bag portion formed by bonding two sheet members together. The bag portion includes an expansion portion including an annular joining portion extending in an annular shape, and a passage portion including a pair of parallel linear joining portions and connected to the expansion portion. Air filled in the bag portion flows through an internal space of the expansion portion surrounded by the annular joining portion and a passage sandwiched between the linear joining portions defining the passage portion. At a connection portion between the expansion portion and the passage portion, the linear joining portions extend in parallel, or the linear joining portions extend so as to expand toward a deep side of the passage from an opening position of the passage with respect to the internal space of the expansion portion.

A seat assembly may include a seatback frame, a primary carrier, an airflow duct, and a plurality of airflow outlets. The primary carrier may be connected to the seatback frame. The airflow duct may be defined at least partially by the primary carrier. The plurality of airflow outlets may extend through the primary carrier to an external surface and may be in fluid communication with the airflow duct.

A pump assembly includes a pump with a pump body having a discharge passage, a motor operable to drive the pump to discharge compressed air through the discharge passage, a casing at least partially surrounding the pump and the motor, and a motor mount at least partially supporting the motor within the casing. The motor mount includes an outer axial wall, an inner axial wall, a radial wall extending between the outer axial wall and the inner axial wall, a first plurality of projections extending from the radial wall toward the motor, and a second plurality of projections extending from the radial wall away from the motor.

A circuit arrangement to control at least one valve includes at least one actuator with at least one positioning element adjustable between at least one first position and a second position. At least one driver unit activates the actuator and a control unit operates the driver unit. At least one air mass measuring device measures an air mass flowing through the valve. The control unit processes an output signal of the air mass measuring device. Valves, valve arrangements, seat comfort systems, and methods all use such circuit arrangements.

A seat assembly may include a seatback frame, a primary carrier, an airflow duct, and a plurality of airflow outlets. The primary carrier may be connected to the seatback frame. The airflow duct may be defined at least partially by the primary carrier. The plurality of airflow outlets may extend through the primary carrier to an external surface and may be in fluid communication with the airflow duct.

A valve includes a valve housing defining at least one first opening and at least one second opening, the valve housing enclosing a valve chamber. An actuator with a positioning element is configured for opening or closing the valve. Also provided are at least one air mass measuring device for measuring an air mass flowing through the valve or at least one measuring wire of an air mass measuring device for measuring an air mass flowing through the valve. A valve arrangement and a seat comfort system are also disclosed.

The movement inducing device includes a plurality of air bags, each being provided with a contacting portion configured to contact with a user and induce a movement of an intended skeletal muscle of the user; a drive mechanism configured to expand and compress the air bags by adjusting supply and discharge of air to and from each air bag and a control unit provided with a drive control unit configured to control driving of the drive mechanism to make the intended skeletal muscle of the user perform at least one of an isotonic muscle activity, an isometric muscle activity and an isokinetic muscle activity.

A diaphragm assembly includes a diaphragm defining a volume space; a diaphragm body extending from the diaphragm; a transition region from the diaphragm to the diaphragm body located on an outer side of the diaphragm and the diaphragm body facing away from the volume space; and a convex abutment contour arranged adjacent to the transition region. Related seat and pump assemblies are also disclosed.

A seat assembly may include a seat having a seat base and a seat back, a temperature control unit disposed at least partially in the seat back, and/or an ECU connected with the temperature control unit. The ECU may be configured to receive an input related to (i) a first state corresponding to symptoms and/or discomfort associated with dysmenorrhea and/or (ii) a second state corresponding to symptoms and/or discomfort associated with sciatica. The ECU may be configured to operate the seat assembly according, at least in part, to the input.

A seat device includes a holding member that holds an air tube and is located below a seat cushion. The holding member includes a base wall that defines a holding surface for the air tube, a locking portion that locks air tubes routed along the holding surface on the base wall, and a side wall extending in a routing direction of each of the air tubes.