Active headrest device for a vehicle

An active headrest device for a vehicle comprising:

• a headrest portion (2) rotatably mounted, through rotation means (3), to a support member (4) in order to allow the headrest portion (2) to swing between an extreme front position and an extreme back position in respect to the vehicle;
• a pushing means (5) engaged by a first elastic means (6) which may be blocked or released by a swinging blocking arm (7) connected to an inertial mass (8);
• wherein in an active condition (A), the blocking arm (7) holds the pushing means (5) in a retracted condition allowing the headrest portion (2) to swing between the extreme front position and the extreme back position, and in which the first elastic means (6) transmits to the pushing means (5) an elastic force directed in the direction of the extreme front position of the headrest portion (2), the inertial mass (8), when subjected to a stress larger than a predefined threshold in a front or back direction, causing a rotation of the blocking arm (7) which releases the pushing means (5) which, as a result of the elastic force of the first elastic means (6), rotates and/or stops the headrest portion (2) in the extreme front position;
• the headrest portion (2) being shaped in section substantially as an upside down “U” and containing in an inner cavity an upper portion of the support member (4), the pushing means (5), the first elastic means (6), the blocking arm (7) and the inertial mass (8);
• a lower portion of the support member (4) being mountable to a seat back;
• and,
• a tie-rod (22) having a first end connected to the pushing means (5) and a second end connected to a part of the headrest portion (2) located opposite to an inner and lower part of the headrest portion upon which the pushing means (5) acts when in an inactive condition, the first end of the tie-rod being fixed to a sliding head (12) of the pushing means (5).

An active headrest device for a vehicle comprising:

• a headrest portion (2) rotatably mounted by rotation means (3) to a support member (4) in order to allow the headrest portion (2) to swing between an extreme front position and an extreme back position in respect to the vehicle;
• pushing means (5), engaged by first elastic means (6), which may be blocked or released by a swinging blocking arm (7) connected to an inertial mass (8);
• wherein in an active condition (A), the blocking arm (7) holds the pushing means (5) in a retracted condition allowing the headrest portion (2) to swing between the extreme front position and the extreme back position, and in which the first elastic means (6) transmits to the pushing means (5) an elastic force directed towards the extreme front position of the headrest portion (2), the inertial mass (8), when subjected to a stress larger than a predefined threshold in a front or back direction, causing a rotation of the blocking arm (7) which releases the pushing means (5) which, in response to the released elastic force of the first elastic means (6), rotates and/or stops the headrest portion (2) in the extreme front position;
• the headrest portion (2) being shaped in section substantially as an upside down “U” and containing in an inner cavity at least an upper portion of the support member (4), the pushing means (5), the first elastic means (6), the blocking arm (7) and the inertial mass (8);
• a lower portion of the support member (4) being attachable to a seat back;
• and
• wherein the rotating means (3) include a connecting pin (60) for providing a rotating connection between the support member (4) and the headrest portion (2);
• said pin (60) being placed in a lower part of the inner cavity of the headrest portion (2).

An active headrest device for a vehicle comprising:

• a headrest portion (2) rotatably mounted through rotation means (3) to a support member (4) in order to allow the headrest portion (2) to swing between an extreme front position and an extreme back position in respect to the vehicle;
• pushing means (5), engaged by first elastic means (6), which may be blocked or released by a swinging blocking arm (7) connected to an inertial mass (8);
• wherein in an active condition (A), the blocking arm (7) holds the pushing means (5) in a retracted condition allowing the headrest portion (2) to swing between the extreme front position and the extreme back position, and in which the first elastic means (6) transmits to the pushing means (5) an elastic force directed towards the extreme front position of the headrest portion (2), the inertial mass (8), when subjected to a stress larger than a predefined threshold in a front or back direction, causing a rotation of the blocking arm (7) which releases the pushing means (5) which, in response to the released elastic force of the first elastic means (6), rotates and/or stops the headrest portion (2) in the extreme front position;
• the headrest portion (2) being shaped in section substantially as an upside down “U” and containing in an inner cavity at least an upper portion of the support member (4), the pushing means (5), the first elastic means (6), the blocking arm (7) and the inertial mass (8);
• a lower portion of the support member (4) being attachable to a seat back;
• and,
• wherein the pushing means (5) are connected by a flexible means (50) to a movable handle (51) wherein manual activation of said movable handle (51) switches the device from an inactive condition (I) to the active condition (A);
• the movable handle (51) being located in an upper wall of the headrest portion (2).