Occupant detecting seat assembly with headrest and method of moving headrest

• US 20050264051A1
• Filed: 05/26/2004
• Published: 12/01/2005
• Est. Priority Date: 05/26/2004
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Blake, Thomas Bernard, Lawall, Jennifer P.
• Granted Patent: US 7,367,626 B2
• Time in Patent Office: Days
• US Class Current: 297/216.120
• CPC Class Codes: B60N 2/42781 mechanical triggering
• CPC Class Codes: B60N 2/4279 electric or electronic triggering
• CPC Class Codes: B60N 2/888 with arrangements for protecting against abnormal g-forces, e.g. by displacement of the head-rest

Abstract

A seat assembly includes a seat and a headrest connected to the seat and movable between a first position and a second position with respect to the seat. The seat assembly also includes a biasing element biasing the headrest toward the second position. A releasable headrest restraining mechanism restrains the headrest in the first position when the seat is unoccupied and releases the headrest to permit movement of the headrest via the biasing element to the second position when the seat is occupied. A method of moving the headrest is also provided.

Claims

1. A seat assembly comprising:

a seat;

a headrest connectable to said seat and movable between a first position and a second position with respect to said seat;

a biasing element;

wherein said biasing element is operable for biasing said headrest toward said second position;

a releasable headrest restraining mechanism;

an occupant detection mechanism operable for detecting the presence of an occupant at said seat;

wherein said occupant detection mechanism is operatively connectable to said releasable headrest restraining mechanism; and

wherein said releasable headrest restraining mechanism is operable for restraining said headrest in said first position when said occupant detection mechanism does not detect the presence of an occupant and for releasing said headrest to permit movement of said headrest to said second position via said biasing element when said occupant detection mechanism detects the presence of an occupant at said seat.

2. The seat assembly of claim 1, wherein said headrest extends further from said seat in said second position than in said first position.

3. The seat assembly of claim 2, wherein said seat forms a cavity;

wherein said headrest is substantially within said cavity when said headrest is in said first position.

4. The seat assembly of claim 3, wherein said headrest has an uppermost portion;

wherein said seat has a top portion; and

wherein said uppermost portion of said headrest does not extend beyond said top portion of said seat when said headrest is in said first position.

5. The seat assembly of claim 1, wherein said occupant detection mechanism is disposable in said seat;

wherein said occupant detection mechanism includes a lever;

wherein said lever is movable between an undepressed position and a depressed position;

wherein said lever moves from said undepressed position to said depressed position in response to the presence of an occupant at said seat; and

wherein said releasable headrest restraining mechanism releases said headrest when said lever is moved to said depressed position.

6. The seat assembly of claim 5, further comprising a cable configured for connecting said lever with said releasable headrest restraining mechanism;

wherein said lever is operable for pulling said cable when said lever moves from said undepressed position to said depressed position in response to the presence of an occupant at said seat; and

wherein said releasable headrest restraining mechanism releases said headrest when said cable is pulled.

7. The seat assembly of claim 5, wherein said seat includes a seat back and a seat bottom;

and wherein said lever is disposable in one of said seat back and said seat bottom.

8. The seat assembly of claim 1, wherein said occupant detection mechanism is disposable in said seat;

wherein said occupant detection mechanism includes a switch, wherein said switch is operable in response to the presence of an occupant at the seat for sending a communication signal to said releasable headrest restraining mechanism; and

wherein said releasable headrest restraining mechanism releases said headrest in response to said communication signal.

9. The seat assembly of claim 1, wherein said occupant detection mechanism includes a sensor;

wherein said sensor is operable for signaling communication with said releasable headrest restraining mechanism;

wherein said sensor is operable for sending a communication signal to said releasable headrest restraining mechanism when said sensor detects the presence of an occupant at said seat; and

wherein said releasable headrest restraining mechanism releases said headrest in response to said communication signal.

10. The seat assembly of claim 1, wherein said releasable headrest restraining mechanism is movable between a restraining position and a release position;

wherein said releasable headrest restraining mechanism restrains said headrest when said releasable headrest restraining mechanism is in said restraining position; and

wherein said releasable headrest restraining mechanism releases said headrest when said releasable headrest restraining mechanism is in said release position.

11. The seat assembly of claim 10, wherein said releasable headrest restraining mechanism further includes:

a solenoid having a movable actuator;

wherein said occupant detection mechanism is operable for signaling communication with said solenoid; and

wherein said actuator moves from said restraining position to said release position when said solenoid receives a communication signal from said occupant detection mechanism.

12. The seat assembly of claim 1, further comprising:

headrest support structure;

wherein said headrest support structure is operable for connecting said headrest with said seat;

wherein said headrest support structure is movable with said headrest with respect to said seat;

wherein said headrest support structure is releasably matable with said releasable headrest restraining mechanism;

wherein said releasable headrest restraining mechanism restrains said headrest support structure such that said headrest is restrained in said first position when said releasable headrest restraining mechanism and said headrest support structure are mated; and

wherein said releasable headrest restraining mechanism releases from said headrest support structure to permit movement of said headrest to said second position when said occupant detection mechanism detects the presence of an occupant at said seat.

13. The seat assembly of claim 12, wherein said biasing element is a spring operatively connectable with said headrest support structure;

and wherein said spring moves from one of a compressed position and an extended position to a substantially relaxed position when said releasable headrest restraining mechanism moves from said restraining position to said release position, said movement of said spring acting to move said headrest from said first position to said second position.

14. The seat of claim 13, wherein said spring is disposable inside of said headrest support structure.

15. A seat assembly comprising:

a seat;

a headrest connected to said seat and movable between a first position and a second position with respect to said seat;

a biasing element biasing said headrest toward said second position;

a releasable headrest restraining mechanism movable between a restraining position and a release position;

wherein said releasable headrest restraining mechanism restrains said headrest in said first position when said releasable headrest restraining mechanism is in said restraining position;

wherein said releasable headrest restraining mechanism releases said headrest to permit movement of said headrest to said second position via said biasing element when said releasable headrest restraining mechanism is in said release position;

headrest support structure connecting said headrest with said seat;

wherein said headrest support structure and said releasable headrest restraining mechanism are releasably matable;

an occupant detection mechanism disposed in said seat and operable for detecting the presence of an occupant at said seat;

wherein said occupant detection mechanism includes a lever;

wherein said lever is movable between an undepressed position and a depressed position in response to the presence of an occupant at said seat;

a cable connecting said occupant detection mechanism with said releasable headrest restraining mechanism;

wherein said lever pulls said cable when said lever is moved between said undepressed position and said depressed position; and

wherein said releasable headrest restraining mechanism moves from said restraining position to said release position when said cable is pulled, thereby releasing said headrest support structure.

16. A method comprising:

restraining a headrest in a first position;

detecting the presence of an occupant at a seat, said seat being connected to said headrest;

after said detecting, releasing said headrest such that said headrest is movable to a second position; and

after said releasing, moving said headrest from said first position to said second position.

17. The method of claim 16, wherein said detecting a presence of an occupant at a seat includes depressing a lever;

and further comprising;

pulling a cable;

said pulling a cable resulting in releasing said headrest.

18. A vehicle comprising:

structure forming an interior passenger space;

a seat assembly located in said interior passenger space, said seat assembly comprising;

a seat;

a headrest connected to said seat and movable between a first position and a second position with respect to said seat;

a biasing element operable for biasing said headrest toward said second position;

a releasable headrest restraining mechanism;

an occupant detection mechanism operable for detecting the presence of an occupant at said seat;

wherein said occupant detection mechanism is operatively connected to said releasable headrest restraining mechanism;

wherein said releasable headrest restraining mechanism releasably restrains said headrest in said first position when said occupant detection mechanism does not detect the presence of an occupant;

wherein said releasable headrest restraining mechanism releases said headrest to permit movement of said headrest to said second position via said biasing element when said occupant detection mechanism detects the presence of an occupant at said seat; and

wherein said headrest extends higher in said interior passenger space in said second position than in said first position.

19. A seat assembly comprising:

a seat;

a headrest connectable to said seat and movable between a first position and a second position;

a biasing element operable for biasing said headrest toward said second position;

a releasable headrest restraining mechanism; and

wherein said releasable headrest restraining mechanism is operable for restraining said headrest in a first position when said seat is unoccupied and for releasing said headrest to permit movement of said headrest via said biasing element to said second position when said seat is occupied.