JP3753958B2 - Vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle seat, and more particularly to a structure of a vehicle seat including an active headrest mechanism that protects a neck of an occupant who has generated a secondary collision load such as a rear-end collision.
[0002]
[Prior art]
As a vehicle seat provided with a conventional active headrest mechanism, for example, as shown in Japanese Patent Application Laid-Open No. 2001-58528, a headrest support member that is rotatably supported back and forth with respect to an upper end portion of a seat back frame; A headrest supported by the headrest support member via a stay, and a pressure receiving portion in which the upper end portion is supported by the headrest support member and the pressure receiving portion is supported by the lower end portion at a position where it can receive an impact load of an occupant accompanying a rear-end collision. Some are composed of members.
[0003]
[Problems to be solved by the invention]
However, in such a conventional technique, when a high load is applied to the headrest alone, such as when a child rides only on the headrest, the headrest support member may be deformed.
[0004]
The present invention has been made by paying attention to such a conventional technique, and provides a vehicle seat that does not cause deformation of a headrest support member that supports the headrest even when a load is applied only to the headrest. is there.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is supported by a seat back frame, a headrest support member pivotally supported by the seat back frame so as to be rotatable in the front-rear direction, and a through hole of the headrest support member supported by a headrest holder. A vehicle seat comprising at least a stay, a headrest held by the stay, and a pressure receiving member having a protector that is suspended from the headrest support member and disposed at a position corresponding to the back of the occupant The headrest support member is provided with a stopper bracket that can interfere with the front portion of the seatback frame on the lower side of the headrest holder and / or the front side of the lower end of the stay.
[0006]
According to the first aspect of the present invention, the headrest support member is provided with a stopper bracket capable of interfering with the front portion of the seat back frame on the lower side of the headrest holder and / or the front side of the lower end of the stay. When the load is applied only to the headrest, the headrest stay presses the stopper bracket directly or through the stay, but the stopper bracket interferes with the seat back frame, so the load is absorbed and the headrest is supported. The deformation of the headrest support member thus made does not occur.
[0007]
In addition, since the headrest support member that supports the headrest holder that supports the headrest is installed between the seat back frames, when the occupant's secondary collision force occurs, the headrest is moved back and forth appropriately, and the occupant's The neck is more reliably protected.
[0008]
A second aspect of the present invention is the vehicle seat according to the first aspect, wherein the stopper bracket is formed such that a surface capable of interfering with the seat back frame is substantially flat.
[0009]
According to the second aspect of the present invention, the surface of the stopper bracket capable of interfering with the seat back frame is formed in a substantially flat shape, so that the load applied to the seat back frame by the stopper bracket has a predetermined area. Therefore, the load on the seat back frame can be dispersed without becoming concentrated stress, and the deformation of the seat back frame can be further prevented.
[0010]
A third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the stopper bracket has a lower end portion of a rib surface opposite to a surface capable of interfering with the seat back frame. Is formed in a curved surface shape.
[0011]
According to the invention described in claim 3, when the headrest moves to the front side, when the headrest support member that supports the headrest rotates rearward, the side opposite to the surface that can interfere with the seat back frame of the stopper bracket. The shoulder surface is close to the rear end portion of the through hole of the seat back frame, but the lower end portion of the shoulder surface is curved so that it does not interfere with the rear end portion of the through hole, and the headrest is larger. Can be tilted forward.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. In the following description, FR is the front side, RR is the rear side, UP is the upper side, and LWR is the lower side.
[0013]
1 to 12 show an embodiment of the present invention. Reference numeral 1 denotes an automobile seat as a “vehicle”, which is composed of a seat back 2 and a seat cushion 3. Reference numeral 4 denotes a headrest supported by the seat back 2.
[0014]
The seat back 2 includes a seat back frame 5, a pad (not shown) that covers the seat back frame 5, a trim 6 that covers the pad, a headrest support member 7, a pressure receiving member 8, and a headrest holder 9. It becomes.
[0015]
The seat back frame 5 is laid substantially horizontally between side frames 10 and 10 made of left and right symmetrical iron plates disposed on both sides and a front side FR of upper end portions 10a and 10a of the side frames 10 and 10. The upper cross member 11 made of an iron plate having a U-shaped cross section and the lower cross member 12 made of an iron plate that is laid substantially horizontally on the lower ends 10b, 10b of the side frames 10, 10. The side frames 10, 10, the upper cross member 11, and the lower cross member 12 are supported by a weld GW. An S-shaped spring 13 is installed between the side frames 10 and 10 to improve the ride comfort of the occupant by bending with a load during normal use.
[0016]
The headrest support member 7 is made of an iron plate, and is formed by bending an upper surface portion 7a and a rear surface portion 7b into an inverted L-shaped cross section as shown in FIGS. Further, as shown in FIG. 4, the headrest support member 7 extends left and right, and left and right end portions thereof are support portions 7c and 7c bent from the rear surface portions 7b and 7b to the front side FR. Formed. The support portions 7c and 7c are provided at the upper end portions 10a and 10a of the side frame 10.10 with stepped bolts 14 capable of rotating the headrest support member 7 and rubbing noises and impacts when the headrest support member 7 rotates. The bush 15 for absorption is pivotally supported by the front and rear FR and RR, respectively.
[0017]
First and second through holes that are “through holes” into which the headrest holder 9 is inserted and supported in the bracket 7d that is bent and protrudes forward from the upper surface portion 7a of the headrest support member 7 and the rear surface portion 7b. The holes 16 and 17 are formed so as to be coaxially separated from each other in the vertical direction. That is, the upper first through hole 16 supports the head portion 9 a of the headrest holder 9, and the lower first through hole 17 engages and supports the engaging portion 9 b of the headrest holder 9. Become. Further, the bracket 7d of the headrest support member 7 located on the front side of the lower end of the stay 23 of the headrest holder 9 and the headrest 4 is provided with a stopper bracket 24 that can interfere with the upper cross member 11 of the seat back frame 5. It becomes.
[0018]
The pressure receiving member 8 includes a columnar member 18 having an upper end 18a fixed to the surface of the front side FR of the center portion in the left-right direction of the rear surface portion 7b of the headrest support member 7 and a suspended portion. , A protector 19 supported by the lower end portion 18b of the columnar member 18 and a return spring 20 for an active headrest having a center locked to the protector 19 and both ends supported by the side frames 10 and 10. Being done. The position where the protector 19 is disposed is a position corresponding to the back of the occupant.
[0019]
In the columnar member 18, the upper end portion 18a and the lower end portion 18b are linearly parallel to each other in a side view, and the lower end portion 18b side of the appropriate bent portion 21 is bent slightly forward FR with respect to the upper end portion 18a. The bent portion 22 is bent again so as to be parallel to the upper end portion 18a. The columnar member 18 is crushed to be smaller in the front-rear width than the left-right width by an iron plate, and has a substantially I shape in a front view. The position of the bent portion 21 is determined in relation to the knee position of an occupant sitting on the back side of the seat 1.
[0020]
The protector 19 is disposed at a position where it is possible to receive a secondary impact load accompanying a rear-end collision by an occupant leaning on the seat back 2, and is made of a synthetic resin material. It is about 44 millimeters. The protector 19 includes a cylindrical portion 19a inserted and supported at the lower end portion 18b of the columnar member 18 from the lower LWR, and a front side projecting from the cylindrical portion 19a to the left and right by substantially the same width as the lateral width of the columnar member 18. The FR surface has smooth wing portions 19b and 19b, the back surfaces of the wing portions 19b and 19b, that is, the beads 19c and 19c formed on the rear side RR, and the rear surface of the cylindrical portion 19a, that is, the rear side RR. The active headrest return spring 20 is formed with a locking piece 19d. Since the beads 19c and 19c are cut from the vertical direction in FIG. 12, the moldability is good.
[0021]
The active headrest return spring 20 is engaged with the locking piece 19 d of the protector 19, so that the lower end portion 18 b of the columnar member 18 of the pressure receiving member 8 is always attached by the active headrest return spring 20. It is biased by the front side FR. That is, a lower end portion 7f, which will be described later, of the headrest support member 7 is always urged in a direction in which the headrest supporting member 7 comes into contact with a stopper surface 11d, which will be described later. Since the surface of the rear side RR of the locking piece 19d of the protector 19 is formed as a smooth surface with little frictional resistance, the active headrest return spring 20 is slidable vertically and horizontally on the smooth surface. .
[0022]
The active headrest return spring 20 is formed in a wire shape, and may have a substantially perfect circle or a substantially regular polygon in cross section as long as it is rotatable. Further, the coil spring 20a is connected to the active headrest return spring 20 so as to have a "spring force" that does not extend with a seating load of an occupant (not shown) but can be extended only with a secondary impact load accompanying a rear-end collision. Formed in one place.
[0023]
As shown in FIGS. 1 to 4, the upper cross member 11 is made of an iron plate, and the front side FR is closed from the upper surface portion 11a, the front surface portion 11b, and the lower surface portion 11c, which are extended to the left and right. The side surface RR is formed in a U-shaped cross section, and the stopper surface 11d is formed integrally with the rear surface RR of the lower surface portion 11c. A first hole 11 e into which the upper end portion 18 a of the columnar member 18 of the pressure receiving member 8 can be inserted and the stopper bracket 24 can be inserted into the lower surface portion 11 c, and a stepped bolt 14 is moved along with the movement of the headrest 4. A second hole 11f which is a long “through hole” is formed in the center so as to be movable back and forth. The upper surface portion 11a is formed with notches 11g and 11g for preventing the headrest 4 from interfering with the stay 23.
[0024]
The stopper bracket 24 is made of an iron plate and is press-formed in a U-shaped cross section, and a front surface 24a capable of interfering with the front end portion of the second hole 11f of the upper cross member 11 of the seat back frame 5 is substantially formed. It is formed in a flat shape, and curved surface portions 24d and 24d are formed at the lower end portions of the side surfaces 24b and 24b opposite to the front surface 24a. The distance between the front hole FR of the second hole 11f and the front surface 24a of the stopper bracket 24 in a normal state is 10 degrees at a rotation angle around the stepped bolt 14, and the distance between the rear side RR is stepped. The rotation angle around the bolt 14 is preferably 10 degrees or more.
[0025]
As shown in FIG. 6, a fixed portion 7e is formed at the central portion of the rear surface portion 7b of the headrest support member 7 so that the upper end portion 18a of the columnar member 18 of the pressure receiving member 8 is supported by welding. Is formed with a lower end portion 7f that is suspended from the upper cross member 11 to a position facing a stopper surface 11d that is suspended. A rubber shock absorbing member 25 is supported on the lower end portion 7f, and the stopper surface 11d hits the first shock absorbing portion 25a of the shock absorbing member 25, and further movement is stopped. That is, the rotation prevention position to the back side RR of the headrest support member 7 itself is specified.
[0026]
As described above, the headrest holder 9 engages and is supported by the first and second through holes 16 and 17 formed in the headrest support member 7 and holds the stay 23 of the headrest 4. It is a member made of synthetic resin. The headrest holder 9 has a known stopper mechanism that can be appropriately moved in the vertical position of the stay 23 and can be stopped at an appropriate position.
[0027]
As shown in FIG. 2, the columnar member 18 of the pressure receiving member 8 has a vertical shape in front view, and the holding position of the columnar member 18 is fixed to the fixing portion 7 e of the headrest support member 7. When the own vehicle is collided, even if the load by the occupant from the front side FR of the seat back frame 5, that is, the occupant is pressed against the seat back 2 from the front side FR, the shoulder point of the occupant becomes the columnar member 18. Will not interfere with.
[0028]
Next, the operation according to this embodiment will be described.
[0029]
A front end of the headrest holder 9 of the headrest support member 7 and the lower end of the stay 23 is provided with a stopper bracket 24 that can interfere with the second hole 11f of the upper cross member 11 of the seat back frame 5, so that only the headrest 4 is provided. When a load is applied to the headrest 4, the headrest 4 stay 23 presses the stopper bracket 24 directly or via the stay 23, but the stopper bracket 24 is the second of the upper cross member 11 of the seat back frame 5. By interfering with the hole 11f, the load is absorbed and the headrest support member 7 supporting the headrest 4 is not deformed.
[0030]
In addition, since the headrest support member 7 that supports the headrest holder 9 that supports the headrest 4 is installed between the side frames 10 and 10 of the seat back frame 5, when the secondary collision force of the occupant is generated, the headrest 4 The back and forth movement of the occupant is appropriately performed, and the occupant's neck is more reliably protected.
[0031]
Since the front surface 24a capable of interfering with the second hole 11f of the upper cross member 11 of the seat back frame 5 of the stopper bracket 24 is formed in a substantially planar shape, the upper cross member 11 of the seat back frame 5 is formed by the stopper bracket 24. The load applied to the second hole 11f is received by a surface having a predetermined area, and the load on the second hole 11f of the upper cross member 11 of the seat back frame 5 can be dispersed without becoming concentrated stress. Deformation of the upper cross member 11 of the seat back frame 5 can be further prevented.
[0032]
When the headrest 4 moves to the front side FR and the rear surface portion 7b of the headrest support member 7 that supports the headrest 4 rotates to the rear side RR, the second of the upper cross member 11 of the seat back frame 5 of the stopper bracket 24 is obtained. A rib surface 24c opposite to the front surface 24a capable of interfering with the hole 11f is close to the rear end portion of the second hole 11f of the upper cross member 11 of the seat back frame 5, but at the lower end portion of the rib surface 24c. By forming the curved surface portion 24d, the headrest 4 can be tilted to the front side FR more greatly without interfering with the rear end portion of the second hole 11f.
[0033]
In the seat back 2, the protector 19 at the lower end 18b of the columnar member 18 of the pressure receiving member 8 is always pressed against the front side FR by the active headrest return spring 20, so that the upper end of the columnar member 18 of the pressure receiving member 8 is pressed. The central portion 7e of the headrest support member 7 that supports the portion 18a is in contact with the stopper surface 11d of the upper cross member 11 through the buffer member 25, and through the headrest holder 9 supported by the headrest support member 7. The headrest 4 is held.
[0034]
In a driving state where an occupant sits on a seat cushion 3 of an automobile seat 1 including the seat back 2 and the seat cushion 3 and does not lean his back on the seat back 2, the occupant's head and the headrest 4 There is a gap, and a gap is also formed between the back of the passenger and the pressure receiving member 8. However, since a pad, a trim 6 or the like (not shown) is interposed between the back of the occupant and the pressure receiving member 8, they are in close contact with each other. Further, when the occupant at the time of sitting leans on the seat back 2 in a relaxed state, the back of the occupant can be softly received by the deflection of the pad and the S-shaped spring 13 due to the load applied from the back of the occupant. Is in a state. Accordingly, the seating feeling is good. Of course, no load is applied to the pressure receiving member 8.
[0035]
In this state, when the own vehicle is collided, first, an impact load is applied to the front FR applied to the vehicle body, and the occupant receives a load in a direction thrown out from the seat back 2 to the front FR. Next, a load moved to the rear side RR, that is, a secondary impact load (referred to as a secondary collision) is applied to the occupant. When the impact value due to the “secondary collision” is equal to or greater than the load at which the coil spring 20a of the active headrest return spring 20 starts to expand via the protector 19, the coil spring 20a of the active headrest return spring 20 expands. Accordingly, the protector 19 provided at the lower end portion 18b of the columnar member 18 of the pressure receiving member 8 is moved to the rear side RR.
[0036]
When the lower end portion 18b of the columnar member 18 of the pressure receiving member 8 moves to the rear side RR, the support portions 7c and 7c of the headrest support member 7 rotate to the front side FR with the stepped bolt 14 and the bush 15 as the center. . The headrest holder 9 supported by the headrest support member 7 rotates together with the headrest support member 7 to the front side FR, and the stay 23 supported by the headrest holder 9 is controlled to rotate together with the headrest 4 to the front side FR. By moving to the rear side RR of the occupant's head, the occupant's head can be securely held, so that the occupant's neck can be protected. Of course, such rotation control is performed instantaneously.
[0037]
Thus, the occupant's back moves to the rear side RR due to the impact, so that the occupant's head, which should be left behind, is reliably held by the movement of the headrest 4 to the front side FR. . Since the headrest support member 7 that supports the headrest holder 9 that supports the headrest 4 is installed between the side frames 10 and 10, when a secondary collision force of the occupant is generated, the headrest 4 is appropriately moved back and forth. The occupant's neck is protected more reliably. Further, since the protector 19 of the pressure receiving member 8 supported by the headrest support member 7 is wide left and right by the wing portions 19b and 19b, the seating position of the occupant is seated at an out position, that is, an unpredictable position. The pressure is surely received, and the transmission of the load to the protector 19 of the pressure receiving member 8 is ensured. Moreover, in this state, since the bent portion 21 is bent in the shape of a “<” in the front side FR in the middle of the columnar member 18, when the columnar member 18 of the pressure receiving member 8 moves to the rear side RR, The columnar member 18 of the pressure receiving member 8 does not protrude to the rear side RR, and a space with the rear seat occupant is secured.
[0038]
In addition, since the stay 23 of the headrest 4 is supported so as to be vertically movable with respect to the headrest holder 9, the vertical position of the headrest 4 can be appropriately matched to the position of the head of an occupant having a different physique.
[0039]
Further, since the seat back frame 5 of the seat back 2 is formed into a square shape by the side frames 10, 10, the upper cross member 11, and the lower cross member 12, the strength of the seat back 2 is remarkably improved and a secondary collision is caused. There is no problem that the headrest support member 7 that supports the pressure receiving member 8 that receives pressure is deformed.
[0040]
Further, the columnar member 18 of the pressure receiving member 8 is urged to the front side FR by the active headrest return spring 20 and does not expand with a seating load, but can only expand with an impact load accompanying a rear-end collision. In the seated or relaxed state of the occupant, the active headrest return spring 20 does not extend corresponding to the backrest load caused by the occupant's back, and the S-shaped spring 13 can comfortably hold the occupant's back. Further, when a load due to a secondary collision due to a rear-end collision is applied, the coil spring 20a of the return spring 20 for the active headrest can be extended, so that the columnar member 18 of the pressure receiving member 8 is not hindered. That is why it can move reliably.
[0041]
Since the columnar member 18 of the pressure receiving member 8 corresponding to the back of the occupant, which can receive an impact load accompanying the rear-end collision, is substantially I-shaped when viewed from the front, the weight can be significantly reduced.
[0042]
Since the headrest support member 7 that supports the headrest holder 9 that supports the headrest 4 is integrally formed by the upper surface portion 7a, the rear surface portion 7b, and the bracket 7d, the support means for each member is unnecessary and is supported. There will be no distortion caused by this. Therefore, the operating force of the stay 23 of the headrest 4 does not vary, and the headrest 4 having a stable operating force can be obtained at all times.
[0043]
Since the first through-hole 16 and the second through-hole 17 are formed in the integral headrest support member 7, the center positions of both through-holes 16 and 17 are surely formed on a straight line, When the headrest 4 is moved up and down, it can move up and down smoothly, and no rubbing sound is generated.
[0044]
In the above description of the operation, it is assumed that the head of the occupant is securely held by the movement of the headrest 4, but the movement of the headrest 4 and the movement of the seat back 2 are relative, and the occupant's back Even if the seat back 2 moves to the rear side RR, the headrest 4 does not move relative to the occupant's head and is held in that position, thereby protecting the occupant's head. Including things.
[0045]
In the above embodiment, the stopper bracket 24 has been described as a U-shaped cross section, and the front surface 24a has been described as a plane. However, the present invention is not limited to this. A simple triangle may be used. Further, although the description has been given as “the front side of the lower end portion of the headrest holder 9 and the stay 23 of the headrest 4” as being capable of interfering with the stopper bracket 24, the present invention is not limited thereto, and the headrest holder 9 alone can be used as the headrest 4. Only the front side of the lower end of the stay 23 may be used.
[0046]
【The invention's effect】
According to the first aspect of the present invention, the headrest support member is provided with a stopper bracket capable of interfering with the front portion of the seat back frame on the lower side of the headrest holder and / or the front side of the lower end of the stay. When the load is applied only to the headrest, the headrest stay presses the stopper bracket directly or through the stay, but the stopper bracket interferes with the seat back frame, so the load is absorbed and the headrest is supported. The deformation of the headrest support member thus made does not occur.
[0047]
In addition, since the headrest support member that supports the headrest holder that supports the headrest is installed between the seat back frames, when the occupant's secondary collision force occurs, the headrest is moved back and forth appropriately, and the occupant's The neck is more reliably protected.
[0048]
According to the second aspect of the present invention, the surface of the stopper bracket capable of interfering with the seat back frame is formed in a substantially flat shape, so that the load applied to the seat back frame by the stopper bracket has a predetermined area. Therefore, the load on the seat back frame can be dispersed without becoming concentrated stress, and the deformation of the seat back frame can be further prevented.
[0049]
According to the invention described in claim 3, when the headrest moves to the front side, when the headrest support member that supports the headrest rotates rearward, the side opposite to the surface that can interfere with the seat back frame of the stopper bracket. The shoulder surface is close to the rear end portion of the through hole of the seat back frame, but the lower end portion of the shoulder surface is curved so that it does not interfere with the rear end portion of the through hole, and the headrest is larger. Can be tilted forward.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a seat according to an embodiment of the present invention.
2 is a front view of the seat back frame of FIG. 1. FIG.
FIG. 3 is a perspective view of FIG. 2;
4 is an exploded perspective view of FIG. 3. FIG.
5 is a cross-sectional view taken along line SA-SA in FIG.
6 is a cross-sectional view taken along the line SB-SB in FIG. 3;
7 is an enlarged front view of the protector of FIG. 2;
8 is a side view of FIG. 7. FIG.
9 is a top view of FIG.
FIG. 10 is an explanatory diagram according to an arrow C in FIG. 9;
11 is a cross-sectional view taken along line SD-SD in FIG.
12 is a cross-sectional view taken along line SE-SE in FIG.
[Explanation of symbols]
1 Car seat (vehicle seat)
2 Seat back 4 Headrest 5 Seat back frame 7 Headrest support member 8 Pressure receiving member 9 Headrest holders 16 and 17 First and second through holes 19 which are through holes Protector 23 Stay 24 Stopper bracket 24a It is a surface on which the stopper bracket can interfere. Front 24c Stopper bracket flange surface 24d Stopper bracket curved surface FR Front RR Rear UP Upper LWR Lower

Claims (3)

A seat back frame, a headrest support member that is pivotally supported by the seat back frame so as to be able to rotate back and forth, a stay that is supported by a through hole of the headrest support member via a headrest holder, and held by the stay A vehicle seat comprising at least a headrest and a pressure receiving member having a protector that is suspended from the headrest support member and disposed at a position corresponding to the back of the occupant,
A vehicle seat, comprising: a stopper bracket capable of interfering with a front portion of the seat back frame on a lower side of the headrest support member and on a front side of a lower end portion of the stay. The vehicle seat according to claim 1,
The vehicle seat according to claim 1, wherein the stopper bracket has a substantially flat surface that can interfere with the seat back frame. The vehicle seat according to claim 1 or 2,
The vehicle seat according to claim 1, wherein the stopper bracket is formed in a curved surface at a lower end portion of a rib surface opposite to a surface capable of interfering with the seat back frame.

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