JP2005152132A - Vehicle headrest device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a headrest device for a vehicle that has a simple structure that can be easily attached to various seat backs and can immediately bring a headrest close to a passenger's head when the vehicle undergoes a rear-end collision. I will provide a.
When a vehicle receives a rear-end collision, a lock release mechanism detects a collision from the rear of the vehicle to release the lock mechanism, and a headrest body 3A is in a steady position with respect to a headrest base 3B by a biasing force of a leaf spring 11. Immediately move from front to top. Thus, the headrest body 3A immediately approaches the passenger's head.
[Selection] Figure 3

Description

  The present invention relates to a headrest device attached to a seat back of a vehicle seat.

  Generally, a headrest device that protects the head of an occupant when a vehicle receives a rear-end collision is attached to a seat back of a vehicle seat. The headrest that forms the main body of the headrest device is normally disposed at a steady position slightly away from the occupant's head so that the occupant's head does not inadvertently come into contact with the vehicle during driving. Further, the height position of the headrest is restricted by the dimensions of the passenger compartment and the occupant's field of view.

As this type of headrest device, when the vehicle receives a rear-end collision and the occupant moves backward due to the reaction, the headrest is moved upward to approach the occupant's head so that the occupant's head is reliably received. What was comprised so that a passenger | crew's neck might be protected is known (for example, refer patent document 1).
Japanese Patent Laid-Open No. 11-192869

  Incidentally, the headrest device described in Patent Document 1 requires a complicated link mechanism as a structure for moving the headrest upward, and cannot be easily attached to various seatbacks having different shapes and sizes. There is a problem.

  Therefore, the present invention has a simple structure that can be easily attached to various seatbacks, but can immediately bring the headrest closer to the occupant's head when the vehicle undergoes a rear-end collision. It is an object to provide a headrest device for use.

  A vehicle headrest device according to the present invention is a headrest device attached to a seat back of a vehicle seat, and is capable of moving from a steady position to a front upper side with respect to a headrest base supported above the seat back. A headrest body biased via a leaf spring, a lock mechanism that holds the headrest body in a steady position, and a lock release mechanism that detects a collision from the rear of the vehicle and releases the lock mechanism. It is characterized by.

  In the vehicle headrest device according to the present invention, when the vehicle receives a rear-end collision, the lock release mechanism detects a collision from the rear of the vehicle and releases the lock mechanism, so that the headrest body is applied to the headrest base by the urging force of the leaf spring. On the other hand, the headrest body moves immediately forward and upward from the steady position, and thus the headrest body immediately approaches the occupant's head.

  In the headrest device for a vehicle according to the present invention, the leaf spring has a return behavior that bends and shrinks in a free state in which the lock mechanism is released, for example, a return behavior that curves and shrinks forward from the headrest base. Can do. In this case, it is preferable that the upper end portion of the leaf spring is supported on the headrest base side, because the headrest body surely moves upward with respect to the headrest base when the leaf spring is curved in a convex shape and contracts. In addition, when the lower end of the leaf spring is guided so as to be vertically movable along a guide provided on the headrest base, the headrest body moves relative to the headrest base when the leaf spring is curved and contracted in a convex shape. It is preferable because it moves forward reliably.

  Further, in the vehicle headrest device according to the present invention, the headrest base is supported by the seat back via the headrest stay, and the lock mechanism holds the headrest body in a steady position via a wire passing through the headrest stay. It is preferable because the structure is simplified.

  According to the vehicle headrest device of the present invention, when the vehicle receives a rear-end collision, the unlocking mechanism detects a collision from the rear of the vehicle to release the locking mechanism, and the headrest body is urged by the urging force of the leaf spring. In contrast, since the headrest body moves immediately forward and upward from the steady position, the headrest body can be immediately brought close to the head of the occupant. As a result, when the vehicle receives a rear-end collision and the occupant moves backward due to the reaction, the headrest body can immediately receive the occupant's head to protect the occupant's neck.

  Moreover, since the vehicle headrest device of the present invention has a simple structure mainly composed of leaf springs, it can be easily attached to various seat backs.

  Embodiments of a vehicle headrest device according to the present invention will be described below with reference to the drawings. In the drawings to be referred to, FIG. 1 is a perspective view showing a schematic structure of a vehicle headrest device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a structure of the headrest base side shown in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional view corresponding to FIG. 2 showing the return state of the leaf spring shown in FIG. 2, and FIG. 4 is a partial side view showing the main structure of the unlocking mechanism shown in FIG.

  A vehicle headrest device according to an embodiment is a headrest device attached to a seat back 2 of a vehicle seat including a seat cushion 1 and a seat back 2 as shown in FIG. A supported headrest 3 is provided.

  In the seat back 2, a seat back frame 4 (only the upper structure is shown) is embedded in a seat back pad (not shown) made of a cushion material such as urethane foam. The upper part of the seat back frame 4 is composed of an upper pipe 5 bent in a gate shape when viewed from the front, and a pair of left and right headrest support brackets 6, 6 are formed on the front surface of the horizontal pipe portion 5 A extending in the left-right direction. Are welded. In the headrest support brackets 6 and 6, cylindrical headrest supports 8 and 8 made of synthetic resin are inserted and supported by inserting headrest stays 7 and 7 to be described later.

  Here, as shown in FIG. 2, the headrest 3 is composed of a combination of a front headrest body 3A and a rear headrest base 3B. The front headrest body 3A is mainly composed of a headrest pad (not shown) made of a cushion material such as urethane foam, and a connecting member 9 is embedded on the rear surface side. The connecting member 9 is a member connected to a leaf spring 11 described later, and the connecting portion 9A protrudes from the rear surface of the headrest body 3A.

  On the other hand, the headrest base 3B is integrally formed in a shallow container shape having an open front surface opposed to the rear surface of the headrest body 3A by an appropriate synthetic resin. A pair of left and right headrest stays 7 and 7 are integrally assembled in the lower part of the headrest base 3B so as to penetrate downward. As shown in FIG. 1, the pair of headrest stays 7, 7 are inserted into the pair of headrest support brackets 8, 8 incorporated in the pair of headrest support brackets 6, 6 on the seat back 2 side. The base body 3B is supported above the seat back 2.

  As shown in FIG. 2, the pair of headrest stays 7 and 7 are made of a pipe material, and a pair of left and right support pieces 10 and 10 projecting upward from the headrest base 3 </ b> B are fixed to the upper end portions thereof. Has been. An upper support rod 12 that supports the upper end portion of the leaf spring 11 is installed between the upper end portions of the pair of support pieces 10 and 10 that are members on the headrest base 3B side, and between the lower end portions of the support pieces 10 and 10. The lower support rod 13 which supports the lower end part of the leaf | plate spring 11 is constructed. The lower support rod 13 is movable in the vertical direction along the long holes 10A and 10A by engaging both ends with a pair of long holes 10A and 10A formed as guides under the support pieces 10 and 10. It has become.

  The leaf spring 11 is stretched between the upper support rod 12 and the lower support rod 13 by, for example, winding an upper end portion around the upper support rod 12 and winding a lower end portion around the lower support rod 13. And the connection part 9A of the connection member 9 which protrudes from the rear surface of the headrest main body 3A is being fixed to the center part of the up-down direction of this leaf | plate spring 11 by appropriate means, such as screwing.

  In a free state as shown in FIG. 3, the leaf spring 11 has a return habit of curving and contracting in a convex shape from the headrest base 3 </ b> B side to the front headrest body 3 </ b> A side. For this reason, the headrest main body 3A is movable with respect to the headrest base 3B by the urging force of the leaf spring 11 from the steady position shown in FIG. 2 to the front upper operating position shown in FIG.

  Here, as the lock mechanism 14 for holding the headrest body 3A in the steady position shown in FIG. 2, the lower support rod 13 is connected to the upper end portion of the wire 15 for extending the leaf spring 11, and the lower end portion thereof is hooked. The member 16 is connected. The wire 15 and the hook member 16 are inserted into the headrest stay 7 made of a pipe material, and a cylindrical locking member 17 for locking the hook member 16 is attached to the lower end portion of the headrest stay 7. Has been. Note that such a locking mechanism 14 is attached to the right headrest stay 7 when viewed from the front of the seat back 2 among the headrest stays 7 and 7 shown in FIG. 1.

  Near the lower end portion of the hook member 16, a hook portion 16 </ b> A is formed which is engaged with an inclined surface on an outer tapered locking surface 17 </ b> A formed on the lower end surface of the locking member 17, and below that is formed. A protrusion 16B for releasing the engaged state of the hook portion 16A with the locking surface 17A is formed. The hook member 16 has a hook portion 16 </ b> A locked on a front locking surface 17 </ b> A of a locking member 17 facing the front side of the seat back 2 (see FIG. 1). When pushed toward the rear side, the engaged state with the locking member 17 is released as shown in FIG.

  Here, as shown in FIG. 4, a lock release mechanism 18 that detects a collision from the rear of the vehicle and releases the lock mechanism 14 is attached to the lower end portion of the headrest stay 7 to which the locking member 17 is attached. Has been. The lock release mechanism 18 is fixed to the support bracket 19 that is fixed to the lower end portion of the headrest stay 7, the pendulum sensor 20 that is pivotally attached to the support bracket 19, the trigger 21 and the swing bracket 22, and the swing bracket 22. And a detection lever 23.

  The support bracket 19 pivotally attaches a trigger 20 and a pendulum sensor 21 coaxially via a pin 19A to a portion protruding rearward of the headrest stay 7 so as to be swingable in the front-rear direction of the seat back 2 (see FIG. 1). A swing bracket 22 is pivotally attached to a portion protruding forward of the headrest stay 7 via a pin 19B so as to be swingable in the front-rear direction of the seat back 2.

  The trigger 20 is a member for releasing the engaged state of the hook member 16 with respect to the locking member 17, and has a push protrusion 20 </ b> A that engages with the protrusion 16 </ b> B of the hook member 16 from the front. The trigger 20 swings around the pin 19 </ b> A toward the rear side of the seat back 2, so that the pushing projection 20 </ b> A pushes the projection 16 </ b> B of the hook member 16 toward the rear side of the seat back 2. At the upper part of the trigger 20 near the pin 19A, a locking piece 20B that holds the pendulum sensor 21 in the initial position by abutting on the front hypotenuse 21A of the pendulum sensor 21 to restrict clockwise swing of the pendulum sensor 21. When the pendulum sensor 21 is swung counterclockwise by a predetermined angle (for example, about 45 degrees), an engagement piece 20C that engages with the rear hypotenuse 21B of the pendulum sensor 21 is projected.

  The pendulum sensor 21 is a so-called G sensor that detects a collision from the rear of the vehicle. The pendulum sensor 21A is inclined forward and downward from the arcuate top near the pin 19A and is locked to the locking piece 20B of the trigger 20. And a rear oblique side 21B that is inclined rearward and downward from an arcuate top near the pin 19A and engageable with the engagement piece 20C of the trigger 20. An arcuate external gear 21 </ b> C is formed on the arcuate lower side opposite to the arcuate top of the pendulum sensor 21.

  The swing bracket 22 is formed with an arcuate internal gear 22A that meshes with the arcuate external gear 21C when the pendulum sensor 21 swings counterclockwise from the initial position around the pin 19A. . The swing bracket 22 swings to the rear side of the seat back 2 around the pin 19B, thereby swinging the pendulum sensor 21 in which the external gear 21C is engaged with the internal gear 22A counterclockwise around the pin 19A. Move.

  The detection lever 23 is a member that detects when the vehicle receives a rear-end collision and the back of the occupant sinks into the seat back 2, and is formed of a pipe material bent into an L shape as shown in FIG. The detection lever 23 has one end welded to the lower part of the swinging bracket 22 and extends obliquely downward in the front, and the seat back so that the lower end bent in an L shape is pushed against the back of the occupant. 2 extends in the width direction. The detection lever 23 is embedded in the seat back pad (not shown) of the seat back 2 together with the seat back frame 4 described above.

  In the vehicle headrest device of the embodiment configured as described above, the headrest 3 is in a normal driving posture in which the occupant M is seated on the seat cushion 1 and the back is leaned against the seat back 2 as shown in FIG. The headrest body 3A is arranged at a position slightly away from the head of the occupant M so as not to inadvertently contact the occupant M's head.

  In such a normal driving posture of the occupant M, when the occupant M strongly presses the back against the seat back 2, the lower part of the detection lever 23 shown in FIG. As shown, the detection lever 23 swings together with the swing bracket 22 toward the rear side of the seat back 2 around the pin 19B. In this case, since the pendulum sensor 21 is held at an initial position where it does not contact the internal gear 22A of the swing bracket 22, the swing bracket 22 swings to the rear side of the seat back 2 without swinging the pendulum sensor 21. The operation of the lock release mechanism 18 becomes invalid.

  Here, when the vehicle receives a rear-end collision in a normal driving state as shown in FIG. 5, the reaction causes the pendulum sensor 21 of the unlocking mechanism 18 shown in FIG. 4 to rotate counterclockwise around the pin 19A from the initial position. (See FIG. 7). Further, the back of the occupant M shown in FIG. 5 sinks deeply into the seat back 2 due to the reaction of the rear-end collision, and the detection lever 23 shown in FIG. 1 moves to the rear side of the seat back 2 around the pin 19B together with the swing bracket 22. It swings greatly (see FIGS. 8 and 9).

  As shown in FIG. 7, the external gear 21C of the pendulum sensor 21 meshes with the internal gear 22A of the swing bracket 22, and in this state, the swing bracket 22 is seated around the pin 19B as shown in FIG. By swinging toward the rear side of the back 2 (see FIG. 1), the pendulum sensor 21 further swings counterclockwise about the pin 19A, and the rear hypotenuse 21B contacts the engagement piece 20C of the trigger 20. .

  Thereafter, the swing bracket 22 together with the detection lever 23 further swings to the rear side of the seat back 2 (see FIG. 1) around the pin 19B, whereby the trigger 20 moves to the rear side of the seat back 2 around the pin 19A. Swing. Then, the pushing protrusion 20A at the lower part of the trigger 20 pushes the protruding part 16B at the lower part of the hook member 16 to the rear side of the seat back 2, so that the hook part 16A of the hook member 16 is engaged with the engaging member 17. It is removed from the surface 17A, and thus the locking mechanism 14 is released as shown in FIG.

  When the lock mechanism 14 is released, the leaf spring 11 is instantaneously elastically returned to the free state as shown in FIG. That is, the leaf spring 11 is instantaneously curved and contracted in a convex shape from the headrest base 3B side to the front headrest body 3A side. Then, due to the urging force of the leaf spring 11, the headrest body 3A instantaneously moves from the steady position to the operating position on the front upper side of the headrest base 3B. As a result, as shown in FIG. 10, the headrest body 3A immediately approaches the head of the occupant M, and immediately receives the head of the occupant M to protect the neck of the occupant M.

  Thus, according to the vehicle headrest device of one embodiment, when the vehicle (not shown) receives a rear-end collision, the lock release mechanism 18 (see FIG. 4) detects a collision from the rear of the vehicle and detects the lock mechanism 14. (See FIG. 2) is released, and the headrest body 3A is immediately moved from the steady position to the front upper working position with respect to the headrest base 3B by the biasing force of the leaf spring 11 (see FIG. 3). The head of the occupant M can be immediately approached (see FIG. 10). As a result, when the vehicle receives a rear-end collision and the occupant moves backward due to the reaction (see FIG. 10), the headrest body 3A can immediately receive the occupant M's head to protect the occupant's neck. .

  Here, in the vehicle headrest device according to the embodiment, the structure for moving the headrest body 3A to the front upper side of the headrest base body 3B is configured simply with the leaf spring 11 as a main body, and thus easily attached to various seat backs. can do.

  The vehicle headrest device according to the present invention is not limited to one embodiment. For example, the long hole 10A of the support piece 10 shown in FIGS. 2 and 3 can be changed to the long hole 10B having the shape shown in FIG. The long hole 10B is formed in an L shape whose upper end is bent to the opposite side of the headrest body 3A, and is configured so that the lower support rod 13 can be locked to the stepped portion 10C of the bent portion.

  In the vehicle headrest device including the support pieces 10 and 10 formed with the long holes 10B as shown in FIG. 11, when the lock mechanism 14 is released and the leaf spring 11 is elastically returned to the free state, the lower portion of the leaf spring 11 is moved. The lower support rod 13 to support is latched by the step part 10C of the long hole 10B. For this reason, as shown in FIG. 10, even if the headrest main body 3A is pressed rearward by the head of the occupant M, the headrest main body 3A is reliably held in the operating position protruding forward and upward from the headrest base 3B.

  In the vehicle headrest device of the present invention, the lock release mechanism 18 is not limited to the structure shown in FIG. For example, an appropriate G sensor that detects longitudinal acceleration when the vehicle receives a rear-end collision, and a hook 16A of the hook member 16 is removed from the locking surface 17A of the locking member 17 by operating according to a detection signal of the G sensor. It can be set as the structure provided with the appropriate | suitable electromagnetic plunger etc. which push in a direction.

It is a perspective view showing a schematic structure of a headrest device for vehicles concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the structure by the side of the headrest base | substrate shown in FIG. It is a longitudinal cross-sectional view corresponding to FIG. 2 which shows the return state of the leaf | plate spring shown in FIG. It is a partial side view which shows the principal part structure of the lock release mechanism shown in FIG. FIG. 2 is a side view showing the posture of the occupant seated on the vehicle seat shown in FIG. 1 during normal operation. FIG. 5 is a partial side view corresponding to FIG. 4 illustrating an operation invalid operation state of the lock release mechanism illustrated in FIG. 1. FIG. 5 is a partial side view corresponding to FIG. 4, illustrating an initial operation state of the unlocking mechanism illustrated in FIG. 1. FIG. 5 is a partial side view corresponding to FIG. 4 showing an operation state in the middle stage of operation of the lock release mechanism shown in FIG. 1. FIG. 5 is a partial side view corresponding to FIG. 4 showing an operation state at the end of operation of the lock release mechanism shown in FIG. 1. It is a side view which shows the attitude | position change at the time of the vehicle of the passenger | crew who seated on the vehicle seat shown in FIG. It is a longitudinal cross-sectional view corresponding to FIG. 3 which shows the modification of the guide hole shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat cushion 2 Seat back 3 Headrest 3A Headrest main body 3B Headrest base body 4 Seatback frame 5 Upper pipe 6 Headrest support bracket 7 Headrest stay 8 Headrest support 9 Connection member 9A Connection part 10 Support piece 10A Long hole 10B Long hole 10C Step part 11 Plate Spring 12 Upper support rod 13 Lower support rod 14 Lock mechanism 15 Wire 16 Hook member 17 Locking member 18 Lock release mechanism 19 Support bracket 20 Trigger 21 Pendulum sensor 22 Oscillation bracket 23 Detection lever

Claims (6)

A headrest device attached to a seat back of a vehicle seat,
A headrest base supported above the seat back;
A headrest body biased via a leaf spring so as to be movable forward and upward from a steady position with respect to the headrest base;
A lock mechanism for holding the headrest body in a steady position;
A vehicle headrest device comprising a lock release mechanism that detects a collision from the rear of the vehicle and releases the lock mechanism. 2. The vehicle headrest device according to claim 1, wherein the leaf spring has a return habit of being bent and contracted in a free state in which the lock mechanism is released. 3. The vehicle headrest device according to claim 2, wherein the leaf spring has a returning habit of being bent and contracted forward from the headrest base body. 4. The vehicle headrest device according to claim 3, wherein an upper end portion of the leaf spring is supported on the headrest base side. 5. The vehicle headrest device according to claim 4, wherein a lower end portion of the leaf spring is guided so as to be movable in a vertical direction along a guide provided on the headrest base. The headrest base is supported on the seat back via a headrest stay,
The vehicle headrest device according to any one of claims 1 to 5, wherein the lock mechanism is configured to hold the headrest body in a steady position via a wire passing through the headrest stay. .

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