JP2007269100A - Head-rest structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide head-rest structure capable of filling a clearance between the head of an occupant and a head-rest part without deforming a support part of a head-rest stay in a rear collision. <P>SOLUTION: A fitting part 42 of a joint member 40 is fitted to an upper pipe 20A of a seat back frame 18 freely to rotate in the circumferential direction. Since the joint member 40 supports the head-rest stay 30 freely to swing around a shaft of the upper pipe 20A, when a pressure receiver member 34 receives a load from the chest of the occupant in a rear collision, this load makes the head-rest stay 30 swing around the shaft of the upper pipe 20A to move the head-rest part 16 toward the head of the occupant. Since a reinforcing fitting reinforces the joint member 40, deformation of the joint member 40 by a load from the head-rest stay 18 is restricted by the reinforcing fitting. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a headrest structure in which a headrest stay is supported on an upper portion of a seatback frame.

  In the headrest structure, a so-called active headrest is sometimes employed in which the headrest portion is normally held at a position separated from the occupant's head and the clearance between the occupant's head and the headrest portion is reduced at the time of a rear collision (for example, Patent Literature 1). In such an active headrest, the support portion into which the headrest stay is inserted is directly welded to the upper pipe of the seat back frame.

In this conventional structure, the support portion is deformed when the clearance between the occupant's head and the headrest portion is reduced during a rear-end collision. Therefore, it is necessary to shorten the time required for this deformation.
Japanese Patent Laid-Open No. 10-181401

  In view of the above facts, an object of the present invention is to provide a headrest structure that can close the clearance between the head of the passenger and the headrest portion without deforming the support portion of the headrest stay at the time of a rear collision.

  The headrest structure of the present invention described in claim 1 is provided at an upper portion of a seat, and supports a headrest portion of an occupant, a headrest stay including a pair of leg portions protruding from a lower portion of the headrest portion, A pipe-shaped seat that is provided between the lower portions of the legs and that receives a load from the occupant's chest at the time of a rear collision and an insertion portion into which the legs are inserted and that extends in the seat width direction A fitting portion is formed in the upper portion of the back frame so as to be rotatable in the circumferential direction, and is attached to the joining member, and a joining member that supports the headrest stay so as to be swingable about an axis of the upper portion of the seat back frame. And a reinforcing member that reinforces the joining member and suppresses deformation of the joining member due to a load from the headrest stay.

  According to the headrest structure of the present invention described in claim 1, the fitting portion of the joining member is fitted to the upper part of the seat back frame so as to be rotatable in the circumferential direction, and the joining member has the headrest stay attached to the shaft of the upper part of the seat back frame. As the pressure receiving member receives a load from the occupant's chest during a rear impact, this load causes the headrest stay to swing around the upper part of the seat back frame, and the headrest part Move in the direction. Here, since the reinforcing member reinforces the joining member, deformation of the joining member due to a load from the headrest stay is suppressed by the reinforcing member.

  A headrest structure according to a second aspect of the present invention is characterized in that, in the configuration of the first aspect, the pressure receiving member extends in the seat width direction to a position close to both sides of the seat back frame.

  According to the headrest structure of the present invention described in claim 2, since the pressure receiving member extends in the seat width direction to a position close to both sides of the seat back frame, the load from the occupant's chest at the time of the rear impact is reduced. The pressure receiving member is securely received. Accordingly, the headrest stay can be reliably swung around the upper axis of the seat back frame, and the headrest portion can be reliably moved toward the passenger head.

  A headrest structure according to a third aspect of the present invention is the headrest structure according to the first or second aspect, wherein the headrest stay is disposed from an upper portion to an intermediate portion in the seat vertical direction of the highback seat, and the seat in the highback seat An upper portion of the back pad also serves as a headrest pad, and holds the posture of the headrest stay with the headrest stay interposed therebetween.

  According to the headrest structure of the present invention described in claim 3, since the upper portion of the seat back pad in the high-back seat also serves as the headrest pad and sandwiches the headrest stay, the posture of the headrest stay is normally maintained. For this reason, even if there is no pressure member (for example, a spring etc.) for pressing the headrest stay in a predetermined direction, the so-called wobble feeling of the headrest portion is reduced. When a load that swings the headrest stay around the upper part of the seatback frame is applied at the time of a rear collision, the seatback pad is deformed, so that the headrest part can be moved toward the passenger head.

  As described above, according to the headrest structure of the first aspect of the present invention, the joining member supports the headrest stay so as to be swingable about the axis of the upper portion of the seat back frame, and the joining member is supported by the reinforcing member. Reinforcing has an excellent effect that the clearance between the head of the occupant and the headrest portion can be reduced without deforming the support portion of the headrest stay at the time of a rear collision.

  According to the headrest structure of the second aspect, the pressure receiving member can reliably receive the load from the occupant's chest at the time of the rear collision, and as a result, the headrest portion can be reliably moved toward the occupant's head. It has an excellent effect of being able to.

  According to the headrest structure described in claim 3, an excellent effect that the so-called wobble feeling of the headrest portion in a normal state can be reduced without a pressing member for pressing the headrest stay in a predetermined direction. Have.

  An embodiment of a headrest structure in the present invention will be described with reference to the drawings. In the figure, the arrow UP indicates the upward direction of the vehicle, and the arrow FR indicates the forward direction of the vehicle.

(Configuration of the embodiment)
FIG. 1 is a perspective view showing a cross-section of a part of a thin high-back seat 10 that is a vehicle seat. As shown in FIG. 1, the high-back seat 10 includes a seat cushion 12, and an upper surface portion of the seat cushion 12 is a seating portion 12 </ b> A on which an occupant sits. The seat cushion 12 is slidable in the vehicle front-rear direction by a slide mechanism (not shown). Above the rear end portion of the seat cushion 12, a seat back 14 for supporting the back of the seated occupant is disposed to constitute the seat rear portion. The tilt angle of the seat back 14 can be changed by a reclining mechanism (not shown) provided at a connecting portion with the seat cushion 12.

  As shown in FIG. 1, the high back seat 10 is a seat in which the upper portion of the seat back 14 is up to the height of the head of an occupant (not shown), that is, a headrest portion provided on the seat and supporting the head of the occupant. Reference numeral 16 denotes a headrest integrated seat in which the headrest portion 16 is integrated with the seat and the headrest portion 16 forms the upper portion of the seatback 14. The seat back 14 of the high back seat 10 includes a well-known seat back frame 18, a seat back pad 22, and a seat skin 24. The seat back pad 22 extends continuously in the seat back 14 without being divided in the seat vertical direction (arrow 10H direction), and the upper portion 22A of the seat back pad 22 also serves as a headrest pad.

  As shown in FIG. 2, the seatback frame 18 is disposed in a side portion in the seat width direction (arrow 10W direction) and extends in the seat vertical direction (arrow 10H direction), and the seatback 14. And a top portion 20 that extends along the sheet width direction (arrow 10W direction) and is bent at both sides and connected to a pair of side portions 19 as a whole. It is formed in a shape. The pair of left and right side portions 19 is formed by bending a plate material by press molding, and has a substantially U-shaped open cross section facing each other. The top portion 20 is formed by bending a pipe material into a substantially U-shape, and is located at the upper end portion of the upper pipe portion 20A as an upper portion of the seat back frame that extends along the seat width direction (arrow 10W direction). The lower part of the side pipe part 20B suspended from both ends is firmly attached to the side part 19 by arc welding.

  A plurality of S springs 26 for supporting the back of the occupant are installed on the seat back frame 18, and as shown in FIG. 1, a load to the rear of the seat back pad 22 positioned in front of the S springs 26 is applied. It comes to support. The seat back pad 22 is set to a predetermined hardness using resin (urethane in this embodiment), and the seat back pad 22 itself has a predetermined shape and rigidity. Further, as shown in FIG. 2, a stabilizer 28 extending in the seat vertical direction (arrow 10H direction) is provided in the center in the seat width direction (arrow 10W direction) in order to stabilize the swing of the S spring 26. It is arranged.

  An upper portion of the headrest stay 30 is disposed in the headrest portion 16. The headrest stay 30 is formed by bending a metal pipe into a substantially U-shape opening downward in a front view, and leg portions 32 are suspended from both ends of the horizontal portion 31 located at the upper end. Thereby, the pair of leg portions 32 protrudes from the lower portion of the headrest portion 16 to the lower side of the seat.

  Leg upper portions 32A, which are upper portions of the pair of leg portions 32, are bent from the horizontal portion 31 and are parallel to each other. As shown in FIGS. 2 and 3, the leg intermediate part 32B extending from the leg upper part 32A is bent from the upper leg part 32A toward the lower side of the seat so as to spread outwardly in the vehicle front view, and the seat It is bent toward the back of the seat toward the bottom. The lower leg portions 32C extending from the intermediate leg portion 32B extend parallel to each other on the seat rear side of the S spring 26 and are bent toward the seat front side toward the seat lower side. As shown in FIG. 2, the distance between the leg lower parts 32C is set longer than the distance between the leg upper parts 32A.

  Further, in this embodiment, in order to suppress the amount of protrusion of the seat back 14 to the back side, the side view shape of the headrest stay 30 follows the side view shape of the seat back frame 18 as shown in FIG. It is made into a shape. Thereby, thickness reduction of the seat back 14 is not inhibited.

  As shown in FIG. 2, a band-shaped pressure receiving member 34 is provided between the lower portion of the leg portion 32 (the lower end portion of the leg lower portion 32 </ b> C), and the pressure receiving member 34 is provided on both sides of the seat back frame 18. It extends in the sheet width direction (arrow 10W direction) up to a position close to the pair of side portions 19. The pressure receiving member 34 has both end portions in the sheet width direction (arrow 10W direction) as cylindrical attachment portions 34A, and an intermediate portion in the sheet width direction as a band plate-shaped pressure receiving portion 34B. The leg lower part 32C is inserted into the cylinder of the attaching part 34A, and the attaching part 34A is firmly fixed to the leg lower part 32C.

  As shown in FIG. 1, the pressure receiving portion 34 </ b> B is disposed at a position close to the S spring 26 on the seat rear side of the S spring 26, and is in a state close to the occupant. The pressure receiving portion 34B of the pressure receiving member 34 can support the load behind the seat back pad 22 via the S spring 26, thereby receiving the load from the occupant's chest during the rear-end collision. ing. Further, the back side of the seat back 14 can be thinned by arranging the pressure receiving portion 34B in a position close to the S spring 26 (a position closer to the front), whereby the thin structure of the seat back 14 is established. Is possible.

  The upper part of the leg part lower part 32C is attached (fastened) to both sides of the pipe-like upper pipe part 20A via a resin-made joining member 40. As shown in FIGS. 4 and 5, the joining member 40 includes a substantially C-shaped main portion 40A and a tubular projecting tubular portion 40B projecting from the top and bottom of one side portion of the main portion 40A. It consists of The joining member 40 in the assembled state is disposed so that the main portion 40A is open to the substantially lower side of the seat, and the pair of upper and lower projecting cylindrical portions 40B are disposed so as to be substantially on the front side of the vehicle. .

  The joining member 40 is formed with a fitting portion 42 which is a substantially C-shaped arc groove of the main portion 40A, and the fitting portion 42 surrounds the upper pipe portion 20A as shown in FIG. It is fitted so that it can rotate in the direction. As shown in FIG. 5, the main portion 40 </ b> A is formed with a long hole 44 that penetrates toward the fitting portion 42 on the side opposite to the projecting cylindrical portion 40 </ b> B. The long hole 44 opens along a direction orthogonal to the axial direction of the fitting portion 42. A screw (not shown) is inserted into the upper portion of the long hole 44 in a state in which the fitting portion 42 is fitted to the upper pipe portion 20A (see FIG. 1), and the joining member 40 is connected to the upper pipe portion 20A. (Refer to FIG. 1) It is fastened by screws (not shown).

  Further, the joining member 40 is formed with insertion portions 46 that constitute the inner side of the pair of upper and lower overhanging cylinder portions 40B. The pair of upper and lower insertion portions 46 are provided with lower leg portions 32C of the headrest stay 30 (FIG. 4). Reference) is inserted. As a result, as shown in FIG. 1, the joining member 40 supports the headrest stay 30 so as to be swingable about the axis of the upper pipe portion 20A.

  As shown in FIGS. 4 and 5, a reinforcing metal fitting 50 as a reinforcing member is attached to the joining member 40. The reinforcing metal fitting 50 is highly rigid and has an approximately L shape, and is inserted into an attachment groove 48 formed in the upper part of the joining member 40. Thus, the reinforcing metal fitting 50 covers the upper surface of the upper overhanging cylinder portion 40B, the upper surface of the main portion 40A, and the side surface of the main portion 40A on the side where the long holes 44 are formed. Further, a locking portion 47 for holding the position of the reinforcing metal fitting 50 is formed at the upper part of the upper overhanging cylinder portion 40B so as to come into contact with the upper surface of the reinforcing metal fitting 50 in the attached state.

  An insertion hole 54 is formed through the reinforcing metal fitting 50 at a portion corresponding to the insertion portion 46 of the upper overhanging cylinder portion 40B so that the lower leg portion 32C of the headrest stay 30 can be inserted. A long hole 52 is formed in a portion corresponding to the long hole 44 so that a screw (not shown) can be inserted. The long hole 52 and the long hole 44 are set so that the tilt angle of the headrest stay 30 (see FIG. 3) is an appropriate angle. Further, from the upper part of the main part 40A to the side part on the side where the long hole 44 is formed, an upright part 49 is formed, which rises slightly corresponding to both sides in the width direction of the reinforcing metal fitting 50 for positioning the reinforcing metal fitting 50. ing.

  As described above, the reinforcing metal fitting 50 attached to the joining member 40 reinforces the joining member 40, and the load from the headrest stay 30 in a state where the joining member 40 shown in FIG. 1 supports the headrest stay 30 to the upper pipe portion 20A. The deformation of the joining member 40 due to is suppressed.

  The headrest stay 30 is arranged from the upper portion to the middle portion in the seat vertical direction (arrow 10H direction) of the high back seat 10, and the upper portion 22A of the seat back pad 22 of the high back seat 10 also serves as a headrest pad and sandwiches the headrest stay 30 therebetween. Thus, the posture of the headrest stay 30 is maintained. That is, the seat back pad 22 having a predetermined shape and rigidity extends continuously without being divided in the seat vertical direction (arrow 10H direction), and is folded over the horizontal portion 31 of the headrest stay 30. The headrest stay 30 is clamped from the vehicle front-rear direction.

(Assembly procedure of the embodiment)
Next, the assembly procedure in the main part of the headrest structure of the above embodiment will be described.

  At the time of assembly, first, the fitting portion 42 of the joining member 40 is attached to the upper pipe portion 20A. Next, the reinforcing metal fitting 50 shown in FIG. 5 is inserted into the mounting groove 48 of the joining member 40, and the reinforcing metal fitting 50 is inserted in a state where the insertion hole 54 of the reinforcing metal fitting 50 is aligned with the insertion portion 46 of the joining member 40. The leg lower portion 32C of the headrest stay 30 shown in FIG. 4 is inserted into the hole 54 and the insertion portion 46 of the joining member 40.

  By inserting the leg portion lower part 32 </ b> C of the headrest stay 30 into the insertion hole 54 of the reinforcing bracket 50 and the inserting portion 46 of the joining member 40, the reinforcing bracket 50 prevents the joining member 40 from opening. In this state, since the long hole 52 of the reinforcing metal fitting 50 is aligned with the long hole 44 (see FIG. 5) of the joining member 40, a screw (not shown) can be inserted above the long holes 52, 44. The joining member 40 is fastened to the upper pipe portion 20A (see FIG. 1) with a screw (not shown). In addition, it becomes possible to restrict | limit the swing angle of the headrest part 16 (refer FIG. 1) by using a stepped type for a screw (illustration omitted).

  Thereafter, the attachment portion 34A of the pressure receiving member 34 is fixed to the lower end portion of the lower leg portion 32C shown in FIG. 1, and finally, the headrest stay 30 is sandwiched from the vehicle front-rear direction by the upper portion 22A of the seat back pad 22 in the high back seat 10. Thus, the posture of the headrest stay 30 is maintained.

(Operation and effect of the embodiment)
Next, the operation and effect of the above embodiment will be described.

  The seat back pad 22 shown in FIG. 1 extends continuously without being divided in the seat vertical direction (arrow 10H direction) and has a predetermined shape and rigidity, and its upper portion 22A also serves as a head rest pad. Since the stay 30 is sandwiched from the front-rear direction of the vehicle, the posture of the headrest stay 30 is reliably maintained during normal times. For this reason, even if there is no pressure member (for example, a spring etc.) for pressing the headrest stay 30 in a predetermined direction, the so-called wobble feeling of the headrest portion 16 is reduced.

  The fitting portion 42 of the joining member 40 is fitted to the upper pipe portion 20A of the seat back frame 18 so as to be rotatable in the circumferential direction, and the joining member 40 supports the headrest stay 30 so as to be swingable around the axis of the upper pipe portion 20A. Therefore, when the pressure receiving member 34 receives a load from the occupant's chest during a rear collision, the load swings the headrest stay 30 around the axis of the upper pipe portion 20A, and deforms the upper portion 22A of the seat back pad 22 while deforming the headrest portion 16. Is moved in the direction of the head of the passenger. Here, since the pressure receiving member 34 extends in the seat width direction (arrow 10W direction) to a position close to the both side portions 19 of the seat back frame 18, the pressure receiving member receives a load from the occupant's chest at the time of a rear collision. 34 surely receives.

  At the time of a rear collision, a rear impact from the head of the occupant through the headrest portion 16 is transmitted to the headrest stay 30, but the reinforcing bracket 50 (see FIG. 4) reinforces the joining member 40. The strength sufficient to withstand is ensured, and deformation of the joining member 40 due to the load from the headrest stay 30 is suppressed by the reinforcing metal fitting 50.

  As described above, the clearance between the occupant head and the headrest portion 16 can be reduced without deforming the support portion of the headrest stay 30 at the time of a rear collision with a relatively simple and inexpensive structure with a small number of components. In other words, while maintaining a simple structure for supporting the headrest stay 30 to the upper pipe portion 20A, it is possible to secure the strength against the input from the headrest stay 30 and to maintain the head by smooth swinging of the headrest portion 16 at the time of a rear impact. Compatibility with ensuring responsiveness is possible.

  Further, by using the upper pipe portion 20A itself as a structural member for mounting the headrest stay 30, the amount of protrusion of the structural member for mounting the headrest stay 30 from the upper pipe portion 20A to the vehicle front side can be reduced. Supplementally, in the conventional structure, a bracket is attached to the vehicle front side of the upper pipe portion 20A, and the rotation center of the headrest stay 30 (a shaft portion extending in the seat width direction) is provided on the bracket. The center of rotation was disposed in front of the upper pipe portion 20A. However, in the present structure, since the center of rotation of the headrest stay 30 is made the same as the axis of the upper pipe portion 20A, the amount of protrusion to the front side of the vehicle is reduced.

  Accordingly, when the occupant sinks into the high back seat 10 at the time of a rear collision, the resistance of the back in the vicinity of the occupant's shoulder can be reduced, so that the occupant can easily sink into the high back seat 10. For this reason, the phase difference between the head and neck (neck) is reduced, and the difference between the head G and the chest G is reduced.

(Supplementary explanation of the embodiment)
In the above-described embodiment, the case where the seat is the high-back seat 10 has been described. For example, the headrest portion is applied with another seat that is a separate body from the seatback, and the posture maintenance that maintains the posture of the headrest stay is used. Means may be provided.

  Moreover, in the said embodiment, although the case where a reinforcement member was the substantially L-shaped reinforcement metal fitting 50 was mentioned as an example, the reinforcement member may be another reinforcement member like a reinforcement bar etc., for example. Good.

It is a perspective view showing a section of a high back seat to which a headrest structure concerning an embodiment of the present invention is applied. It is a front view showing the composition of the seat back to which the headrest structure concerning the embodiment of the present invention is applied (the outline of the seat back is shown with a two-dot chain line). It is a side view showing the composition of the seat back to which the headrest structure concerning the embodiment of the present invention is applied (the outline of the seat back is shown with a two-dot chain line). It is an expansion perspective view which shows the joining member and reinforcement member in embodiment of this invention. It is an expansion disassembled perspective view which shows the joining member and reinforcement member in embodiment of this invention.

Explanation of symbols

10 High Back Seat 10H Seat Up / Down Direction 10W Seat Width Direction 16 Headrest 20A Upper Pipe (Upper Seat Back Frame)
DESCRIPTION OF SYMBOLS 22 Seat back pad 22A Upper part of seat back pad 30 Headrest stay 32 Leg part 34 Pressure receiving member 40 Joining member 42 Fitting part 46 Insertion part 50 Reinforcement metal fitting (reinforcement member)

Claims (3)

A headrest provided on the upper part of the seat and supporting the head of the occupant;
A headrest stay having a pair of legs protruding from a lower portion of the headrest portion;
A pressure-receiving member that is provided between the lower portions of the legs and receives a load from an occupant's chest at the time of a rear collision;
An insertion portion for forming the leg portion is formed, and a fitting portion that is rotatably fitted in a circumferential direction is formed on an upper portion of a pipe-like seat back frame that extends in the seat width direction. A joining member that supports the seatback frame so as to be swingable about the axis of the upper portion of the seat back frame;
A reinforcing member attached to the joining member and reinforcing the joining member to suppress deformation of the joining member due to a load from the headrest stay;
The headrest structure characterized by having.   The headrest structure according to claim 1, wherein the pressure receiving member extends in a seat width direction to a position close to both sides of the seat back frame.   The headrest stay is disposed from the upper part to the middle part in the seat vertical direction of the high-back seat, and the upper part of the seatback pad in the high-back seat serves as a headrest pad and holds the posture of the headrest stay across the headrest stay. The headrest structure according to claim 1 or 2, characterized by the above-mentioned.

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