JP4078122B2 - Automotive seat back - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automobile seat back, and particularly to an automobile seat back that protects an occupant's cervical vertebra when the own vehicle is collided and can always press the occupant's lumbar spine.
[0002]
[Prior art]
A conventional seat back of such an automobile is disclosed in Japanese Patent Laid-Open No. 2001-253282.
[0003]
As shown in FIG. 4, the seat back 100 includes an iron plate seat back frame 2 and a support pipe 3 that is supported by the upper frame 2 a of the seat back frame 2 so as to be able to rotate back and forth and move up and down. 3 and a headrest (not shown) supported by the respective upper ends of the respective support pipes 3 and an impact caused by the back of the occupant (not shown) supported by the respective lower ends of the respective support pipes 3 An actuating member 4 that can move only under pressure, a lumbar support member 5 having an upper part supported by the actuating member 4 and a lower part supported by an under frame 2c of the seat back frame 2, and the front and rear of the seat back frame 2 An unillustrated pad formed from polyurethane foam or the like disposed on the fabric, and an illustration such as a cloth covering the pad More not epidermis, is composed of at least.
[0004]
And in this seat back 100, since the upper part of the lumbar support member 5 is supported by the operation member 4, not only is it possible to move by receiving impact pressure from the back of the occupant, but also impact is applied. The lumbar spine of the occupant can be held when not receiving.
[0005]
In this state, when the own vehicle is collided and the seated occupant is pushed rearward by the secondary collision and the pad or the like moves rearward, the operating member 4 is moved to the rear side via the pad or the like by the occupant's back. Pressed.
[0006]
As the operating member 4 moves, the support pipes 3 and 3 and the headrest stay (not shown) move together around the holders 6 and 6, so the headrest (not shown) supported by the stay is In this case, the head is in contact with and supported by the occupant's head. In this way, the upper body of the occupant moves rearward, so that the occupant's head that behaves as it is left is reliably held by the movement of the headrest.
[0007]
In FIG. 4, reference numeral 70 denotes a position below the position where the operation member 4 is arranged and between the side frames 2 b and 2 b so as to elastically support the back of the occupant via a seat back pad (not shown). S spring suspended on
[0008]
[Problems to be solved by the invention]
However, the seat back 100 has a structure in which the lumbar support member 5 itself does not bend in a normal use state in which an occupant is seated. Therefore, the seat back 100 is bottomed by the lumbar support member 5 (particularly the central portion of the lumbar support member 5). The occupant feels a sense of impulsivity, and as a result, there is a problem of causing a decrease in comfortability.
[0009]
Therefore, the present invention has been made paying attention to such a conventional technique, and can satisfy both occupant cervical spine protection when the own vehicle is rearranged and daily occupant comfortability. It aims to provide a seat back for automobiles.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention of claim 1 is directed to a seat back frame and an upper end portion of the seat back frame pivotally supported at both ends, and a headrest supported so as to be movable up and down via a stay. A vehicle seat back comprising a headrest holder, a spring means horizontally mounted on the seat back frame, and a lumbar support member supported by the spring means and pressing the back of the occupant. And
The spring means is formed with a spring recess projecting rearward at a central portion,
The lumbar support member has an upper part attached to and attached to the spring means on both sides of the spring recess, and the headrest holder has an upper end fixed to a central portion of the headrest holder and a lower end, It has an appropriate clearance between the upper portion of the lumbar support member and is formed with an operating rod inserted and attached between the lumbar support member and the spring recess,
The upper portion of the lumbar support member moves forward and backward in the range of the clearance during a daily load that presses the occupant's back, and presses the lower end when the load exceeds the daily load. The headrest holder is configured to rotate in the front direction through the operating rod.
[0011]
For this reason, in the invention of claim 1, since the upper portion of the lumbar support member is elastically supported by the spring means, the clearance between the lower end of the operating rod and the lower end of the operating rod is reduced even during a daily load that presses the back of the occupant. It can move forward and backward within the range, and this forward and backward movement eliminates the feeling of bottoming and provides cushioning properties.
[0012]
In addition, when the load exceeds the daily load, the lumbar support member moves backward beyond the clearance with the lower end of the operating rod, and by this movement, the lower end of the operating rod is pressed to move the headrest holder through the operating rod. Can be rotated in the front direction. Along with this rotation, the headrest supported by the headrest holder can move in the front direction, and by this movement, the headrest can be in contact with and supported by the occupant's head.
[0013]
The invention according to claim 2 is the automobile seat back according to claim 1, wherein the lumbar support member has an upper end coupled to the spring means on both sides of the spring recess and a lower end at the seat back frame. It is attached to the said seat back frame through the wire couple | bonded with the lower end part of this.
[0014]
For this reason, in the invention of claim 2, since the load on the lumbar support member is transmitted to the spring means through the wire, the bending of the wire is added, and accordingly, the upper portion of the lumbar support member in the front-rear direction is added. Advance and retreat can be performed more smoothly.
[0015]
The invention of claim 3 is the automobile seat back according to claim 1 or 2,
The spring means is a zigzag-shaped bent portion that is attached so as to be substantially parallel to the back surface of the seat back, and the spring formed by being bent into a U-shape at a substantially right angle to the bent portion. It is comprised by the S spring which has a recessed part at least.
[0016]
Therefore, in the invention of claim 3, a large bending allowance can be secured by the zigzag-shaped bending portion, and the lower end of the operating rod and the upper portion of the lumbar support member are inserted by inserting the lower end of the operating rod into the spring recess. An appropriate clearance can be easily ensured between the two.
[0017]
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.
[0018]
FIG. 1 shows a frame portion of an automobile seat back 1 as an embodiment of the present invention. The seat back 1 is entirely configured by adding at least a skin pad made of a headrest, polyurethane foam, or the like, or a cloth covering the pad to the frame portion.
[0019]
The frame portion of the seat back 1 is attached to the seat back frame 2 and the upper end portion (upper frame 2a) of the seat back frame 2 with both ends pivoted 8 and 8, and a headrest (not shown) is interposed via the stay. A headrest holder 7 supported so as to be movable up and down, spring means 10 horizontally mounted on the seat back frame 2, and a lumbar support member 11 supported by the spring means 10 and pressing the back of the occupant. It is roughly structured. The headrest is attached by inserting the stay into support holes 9 and 9 formed in the headrest holder 7 so as to be movable up and down. The spring means 10 is suspended and attached between the side frames 2b, 2b of the seat back frame 2.
[0020]
At this time, the spring means 10 is formed with a spring recessed portion 12 protruding rearward at the center portion, and the upper portion of the lumbar support member 11 is connected to the spring means 10 on both sides of the spring recessed portion 12. The headrest holder 7 is attached, and the upper end of the headrest holder 7 is fixed to the center portion of the headrest holder 7, and the lower end 13 a has an appropriate clearance d between the lumbar support member 11 and the lumbar support member 11. And an operating rod 13 to be inserted and attached between the spring recess 12 and the spring recess 12.
[0021]
During a daily load that presses the back of the occupant, the lumbar support member 11 moves forward and backward in the front-rear direction (front FR direction or rear RR direction) while maintaining a gap within the clearance d. When the load exceeds a typical load, the lumbar support member 11 is configured so as to press the lower end 13 a and rotate the headrest holder 7 in the forward direction via the operating rod 13.
[0022]
In the present embodiment, the operating rod 13 is formed of a long metal material, and its lower end 13a is coupled to the lower end of the long metal material and is a resin cap wider than the long material. It consists of The headrest holder 7 operates when the load exceeding the daily load is applied to the lumbar support member 11 due to, for example, a collision of the host vehicle, and the lumbar support member 11 presses the resin cap 13a toward the rear RR. 13, the headrest holder 7 is rotated in the front direction indicated by the arrow a with the pivotal support 8 portion as the rotation center.
[0023]
The lumbar support member 11 includes a lower frame 2c of the seat back frame 2, a lower portion 11a rotatably supported on the front side FR and the rear side RR, and spring means 10 on both sides of the spring recess 12 on the upper UP and It has an upper part 11b that is movably connected to the lower LWR, and a main body part 11c that can be pushed out to the front FR so as to be able to press and support the lumbar spine of a passenger (not shown). And is integrally formed of a synthetic resin material. The rear RR portion of the lumbar support member 11 is provided with a projecting mechanism (not shown) for projecting the main body 11c to the front FR. The cable 15 of the operating means 14 is connected to the push-out mechanism, and the main body 11c of the lumbar support member 11 is pushed out to the front side FR by operating the operating means 14 and winding the cable 15. It is configured as a whole. As this protrusion mechanism, for example, the one described in Japanese Patent Laid-Open No. 2001-253282 is applied.
[0024]
In the seat back 1 having the frame portion configured as described above, the upper portion 11b of the lumbar support member 11 is held by the spring means 10, so that it can be used even during a daily load that presses the back of the occupant. Further, it can move forward and backward within the range of the clearance d between the operating rod 13 and the resin cap 13a, and by this forward and backward movement, it is possible to obtain a cushioning property without feeling the bottom butt.
[0025]
When the load exceeds the daily load, the lumbar support member 11 moves in the rear RR direction beyond the clearance d with the resin cap 13a of the operating rod 13, and the resin cap of the operating rod 13 is moved by this movement. The headrest holder 7 can be rotated in the front FR direction via the operating rod 13 by pressing 13a (the rotation at this time is indicated by an arrow a in FIG. 1). Along with this rotation, the headrest supported by the headrest holder 7 can move in the front FR direction, and by this movement, the headrest can be in contact with and supported by the occupant's head (not shown).
[0026]
Further, in the present embodiment, as shown in FIG. 2, the lumbar support member 11 has an upper end 16a coupled to the spring means 10 on both sides of the spring recess 12, and a lower end 16b which is the lower end of the seat back frame 2 (underframe 2c). ) Is attached to the seat back frame 2 through a wire 16 coupled thereto.
[0027]
At this time, the wire 16 bends one wire into a substantially U shape, bends both ends outward, and further folds both ends into a small U shape to form upper ends 16a and 16a. The lower ends 16b and 16b are generally formed by bending in a U shape so that both side portions from the center of the U-shaped bent portion bulge outwardly. .
[0028]
The lumbar support member 11 includes notches 11d and 11d formed on both sides of the lower portion 11a and grooves 11e and 11e formed on the rear surface of the upper portion 11b.
[0029]
The lumbar support member 11 engages the notches 11d and 11d with the base portions of the lower ends 16b and 16b of the attached wire 16, respectively, and rotatably supports the lower portion 11a on the front side FR and the rear side RR. The groove portions 11e and 11e are engaged with the straight portions 16c and 16c on both sides of the wire 16, respectively, and the upper portion 11b is movably connected to the upper UP and the lower LWR.
[0030]
In this configuration, the load on the lumbar support member 11 is transmitted to the spring means 10 via the wire 16, so that the bending of the wire 16 is added, and the longitudinal direction of the upper portion 11 b of the lumbar support member 11 correspondingly. Can be smoothly advanced and retracted, and thereby, a better cushioning property can be obtained.
[0031]
In the present embodiment, as shown in FIG. 3, the spring means 10 includes a zigzag-shaped bending portion 10a attached so as to be substantially parallel to the back surface of the seat back 1, and a substantially right angle to the bending portion 10a. It is comprised by the S spring which has at least the spring recessed part 12 bent and formed in U shape at the back.
[0032]
At this time, the wire 16 is attached by connecting the upper ends 16a, 16a thereof to the vertical line portions 10b, 10b between the bent portion 10a and the spring recess 12. In FIG. 3, reference numeral 10 c denotes a coupling end for coupling to the side frame 2 b of the seat back frame 2.
[0033]
In this configuration, a large bending allowance can be secured by the zigzag-shaped bending portion 10a, and the resin cap 13a and the lumbar support member 11 are inserted into the spring recess 12 by inserting the resin cap 13a at the lower end of the operating rod 13. The above-mentioned appropriate clearance d can be easily ensured between the upper portion 11b of the two.
[0034]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
[0035]
In other words, according to the first aspect of the present invention, during a daily load that presses the back of the occupant, the upper portion of the lumbar support member can move forward and backward within the range of clearance from the lower end of the operating rod. It is possible to obtain a cushioning effect by eliminating the bottom sensation by movement, and when the load exceeds the daily load, the lumbar support member moves backward beyond the clearance from the lower end of the operating rod due to the load. The headrest supported by the headrest holder can be supported by moving the headrest in the forward direction and contacting the head of the occupant. It is possible to provide an automobile seat back that can satisfy both of the comfortability of the vehicle.
[0036]
According to the second aspect of the present invention, since the lumbar support member is connected to the spring means via the wire, the wire is bent, and accordingly the forward and backward movement of the upper portion of the lumbar support member in the front-rear direction is made smoother. Since it can be performed, in addition to the effect of the invention of claim 1, it is possible to achieve a better cushioning property.
[0037]
According to the invention of claim 3, a large bending allowance can be secured by the zigzag-shaped bending portion, and the lower end of the operating rod and the lumbar support member are inserted by inserting the lower end of the operating rod into the spring recess. In addition to the effect of the invention of claim 1 or 2, the structure is complicated and the apparatus is not enlarged.
[Brief description of the drawings]
FIG. 1 is a perspective view of a frame portion of an automobile seat back as an embodiment of the present invention.
2 is a perspective view of a lumbar support member applied to the automobile seat back of FIG. 1. FIG.
FIG. 3 is a perspective view of spring means applied to the automobile seat back of FIG. 1;
FIG. 4 is a front view of a frame portion of a conventional automobile seat back.
[Explanation of symbols]
1 Seat back (Automotive seat back)
2 Seat back frame 2a Upper frame (upper end of seat back frame)
2c Underframe (lower end of seat back frame)
7 Headrest holder 8 Pivoting part 10 S spring (spring means)
10a Zigzag-shaped bending part 11 Lumbar support member 11b Upper part (of lumbar support member)
12 Spring recess 13 Actuation rod 13a Resin cap (lower end of actuation rod)
16 Wire 16a Upper end (of wire)
16b Lower end (of wire)
a Front rotation d Clearance FR Front RR Rear UP Upper LWR Lower

Claims (3)

A seat back frame, a headrest holder that is pivotally supported at both ends of the seat back frame and supported by a headrest so as to be movable up and down via a stay, and a spring that is horizontally mounted on the seat back frame And a lumbar support member that is supported by the spring means and presses the back of the occupant.
The spring means is formed with a spring recess projecting rearward at a central portion,
The lumbar support member is attached with its upper part connected to the spring means on both sides of the spring recess,
The headrest holder has an upper end fixed to a central portion of the headrest holder, and a lower end having an appropriate clearance between the upper portion of the lumbar support member and between the lumbar support member and the spring recess. The upper portion of the lumbar support member moves forward and backward in the range of the clearance during a daily load that presses against the back of the occupant. At the time of a load exceeding the daily load, the upper portion of the lumbar support member is configured to press the lower end and rotate the headrest holder in the front direction via the operating rod. An automobile seat back characterized by that. The automobile seat back according to claim 1,
The lumbar support member is attached to the seat back frame via a wire having an upper end coupled to the spring means on both sides of the spring recess and a lower end coupled to the lower end of the seat back frame. Car seat back. The automobile seat back according to claim 1 or 2,
The spring means is a zigzag-shaped bent portion that is attached so as to be substantially parallel to the back surface of the seat back, and the spring formed by being bent into a U-shape at a substantially right angle to the bent portion. An automobile seat back comprising an S spring having at least a recess.

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