Abstract: The present disclosure relates to a rotating body fixing means for a helmet. The rotating body fixing means for a helmet, according to the present disclosure, is provided at the helmet comprising a helmet body (10) and a rotating body (20) rotatably coupled to the helmet body (10), and comprises a fixing part (100), which is slidably disposed at one side of the helmet body (10), slides such that the protruding degree thereof from the helmet body (10) varies, and comes in contact with the rotating body (20) when protruding from the helmet body (10).

Abstract: An active headrest apparatus for a vehicle seat. A contact area in which the upper body of a person who is seated in a car in the event of a rear-end collision of the car is moved backward due to an inertial force and contacts a back plate can be increased, and a distance at which a headrest is moved and rises can be increased so that the function of an active headrest can be more faithfully performed and neck injury of the person who is seated in the car can be prevented to the maximum.

Abstract: An automatic moving apparatus may include a collision prediction sensor, a control unit comparing a value measured by the collision prediction sensor, with a reference value stored in the control unit, and outputting a control signal when it may be determined that the value measured by the collision prediction sensor is higher than the reference value, and a headrest moving unit moving a headrest unit toward a passenger's head before the headrest unit comes into contact with the passenger's head, and including a stay rod connected to the headrest unit, both sides of the stay rod being placed in a vertical direction, tilting device tilting the stay rod forwards or backwards relative to a seatback in response to the control signal of the control unit, and vertical moving device moving the stay rod in a vertical direction in response to the control signal of the control unit.

Abstract: An automatic moving apparatus may include a collision prediction sensor, a control unit comparing a value measured by the collision prediction sensor, with a reference value stored in the control unit, and outputting a control signal when it may be determined that the value measured by the collision prediction sensor is higher than the reference value, and a headrest moving unit moving a headrest unit toward a passenger's head before the headrest unit comes into contact with the passenger's head, and including a stay rod connected to the headrest unit, both sides of the stay rod being placed in a vertical direction, tilting device tilting the stay rod forwards or backwards relative to a seatback in response to the control signal of the control unit, and vertical moving device moving the stay rod in a vertical direction in response to the control signal of the control unit.

Abstract: An active headrest apparatus for a vehicle seat. A contact area in which the upper body of a person who is seated in a car in the event of a rear-end collision of the car is moved backward due to an inertial force and contacts a back plate can be increased, and a distance at which a headrest is moved and rises can be increased so that the function of an active headrest can be more faithfully performed and neck injury of the person who is seated in the car can be prevented to the maximum.