JP4297838B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat in which a headrest is mounted on a seat back.

  Generally, a headrest that protects the head of a seated person when the vehicle receives a rear-end collision is mounted on the seat back of the vehicle seat. The headrest is usually disposed at a position slightly rearward from the seated person's head so that the seated person's head does not inadvertently come into contact with the vehicle during driving.

  As this type of vehicle seat, when the vehicle undergoes a rear-end collision and the seat occupant moves backward due to the reaction, the left and right headrest holders are moved by passive means disposed in the seat back so that the seat body moves backward. Is known, and the headrest is tilted forward to enhance the protection of the head and neck of the seated person (see, for example, Patent Document 1).

Here, the left and right headrest holders are guided through the guide means so as to be able to tilt upward, and the guide means includes an elongated guide hole formed in the guide bracket on the seat back frame side, It is comprised by the combination with the guide pin protrudingly provided by the headrest holder.
JP 2001-163099 A (paragraph number 0014, FIG. 1)

  By the way, in the vehicle seat described in Patent Document 1, when the headrest holder vigorously rises forward with the backward movement of the upper body of the seated person, the guide pin may be rebounded at the upper end of the guide hole. In this case, the headrest is lowered together with the headrest holder from the intended forward tilted position.

  In addition, the passive means is mainly composed of a belt extending in the center of the seat back between the left and right headrest holders, and the rearward movement load of the upper body of the seated person is transferred from the central belt to the headrests on both the left and right sides. It is transmitted to the holder. For this reason, the load transmitted to the left and right headrest holders is likely to be uneven, and the headrest may be tilted and cannot be smoothly tilted forward.

  Therefore, the present invention provides a vehicle seat that can smoothly move a headrest toward a seated person's head when the vehicle undergoes a rear-end collision, and can be surely stopped at an intended position on the movement end side. The issue is to provide.

  A vehicle seat according to the present invention is a vehicle seat in which a headrest is mounted on a seatback, and has a headrest support bracket for mounting the headrest in the seatback, and the headrest is a seated person's seat. A headrest frame that is movably connected to the seatback frame via a guide portion so as to be able to move toward the head, and an operating force generation means that generates an operating force by using a backward movement load of the seated person, Actuating force transmitting means for moving the headrest frame in cooperation with the actuating force generating means is provided, and the guide portion includes a guide plate having a guide hole and a pin movably fitted in the guide hole, The guide hole is configured such that the sliding resistance with respect to the pin increases from the movement start end side of the headrest frame to the movement end side. And said that you are.

  In the vehicle seat according to the present invention, when the vehicle receives a rear-end collision and the seat occupant moves backward due to the reaction, the operating force generating means generates an operating force with the backward moving load as an input, and the operating force is linked to this. The transmission means smoothly moves the headrest frame from the movement start end side to the movement end side by the guide portion. At that time, since the sliding resistance of the guide hole with respect to the pin of the guide portion increases on the moving end side of the headrest frame, the headrest frame decreases in moving speed and is prevented from being bounced or rattled. Stops securely in position. Therefore, the headrest mounted on the headrest support bracket via the headrest stay moves smoothly toward the seated person's head, and reliably stops at the intended position on the movement end side without rattling.

  In the vehicle seat of the present invention, the sliding resistance with respect to the pin of the guide hole is less than the movement start end side of the headrest frame by reducing the fitting width of the guide hole to the pin from the movement start end side of the headrest frame. It can be configured to increase on the mobile end side. In this case, the fitting width of the guide hole with respect to the pin may be gradually reduced in a wedge shape from the movement start end side to the movement end side of the headrest frame, or the fitting width is formed in a wedge shape only on the movement end side. May be. Moreover, you may form the unevenness | corrugation which increases sliding resistance in the periphery of the guide hole by the side of a movement termination | terminus.

  In the vehicle seat according to the present invention, when the vehicle receives a rear-end collision and the seat occupant moves backward due to the reaction, the operating force generating means generates an operating force with the backward moving load as an input, and the operating force is linked to this. The transmission means smoothly moves the headrest frame from the movement start end side to the movement end side by the guide portion. At that time, since the sliding resistance of the guide hole with respect to the pin of the guide portion increases on the moving end side of the headrest frame, the headrest frame decreases in moving speed and is prevented from being bounced or rattled. Stops securely in position. Therefore, according to the present invention, when the vehicle undergoes a rear-end collision, the headrest is smoothly moved together with the headrest frame toward the seated person's head, and it is ensured without rebounding or rattling at the intended position on the movement end side. The impact applied to the seated person's neck can be reliably reduced.

  Embodiments of a vehicle seat 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 main structure of a vehicle seat according to an embodiment of the present invention.

  As shown in FIG. 1, the vehicle seat according to an embodiment includes a seat back 3 that is connected to a rear portion of a seat cushion 1 via a tilt mechanism 2 so as to be tiltable back and forth, and an upper portion of the seat back 3. The headrest 4 is detachably mounted via headrest stays 4A and 4A.

  In the seat back 3, a seat back frame 5 serving as a skeleton is embedded in a seat back pad (not shown) formed of a cushion material such as urethane foam. As shown in FIGS. 2 and 3, the seat back frame 5 includes an upper upper pipe 5A bent in a frontal view, left and right side frames 5B and 5B, and a lower lower frame formed in a belt shape. 5C is connected to each other by welding. The lower ends of the side frames 5B and 5B constituting the seat back frame 5 are pivotally supported on the pivot 2A of the tilt mechanism 2.

  A contour mat 6 is disposed inside the seat back frame 5. The contour mat 6 is an elastic mat formed in a planar shape with a wire such as a piano wire, and mounting hooks 6A and 6A for mounting are formed on the left and right upper portions. The left and right vertical pipe portions 5A1 and 5A1 extending in the vertical direction of the upper pipe 5A are protruded inward so that the engagement hooks 6A and 6A are locked and the upper portion of the contour mat 6 is supported. The support rods 5A2 and 5A2 bent upward are welded.

  Here, as shown in FIGS. 1 to 3, a headrest frame 7 for mounting the headrest 4 is disposed inside the upper portion of the seat back frame 5. The headrest frame 7 is made of a pipe material bent in a frontal gate shape, and a central portion 7A of a portion extending in the left-right direction and a lower end portion 7B of a left-right portion extending in the up-down direction are flattened. (See FIG. 3). A pair of left and right headrest support brackets 7C and 7C are welded to the front surface of the central portion 7A of the headrest frame 7.

  The headrest support brackets 7C and 7C protrude upward from the central portion 7A of the headrest frame 7, and the upper portions thereof are guide rings 5A4 welded to the front surfaces of the horizontal pipe portions 5A3 and 5A3 of the upper pipe 5A constituting the seat back frame 5. , 5A4 (see FIG. 4). The pair of left and right headrest stays 4A and 4A protruding from the lower portion of the headrest 4 are inserted into the headrest support brackets 7C and 7C, so that the headrest 4 is detachably attached to the headrest frame 7. (See FIG. 1).

  Flat bottom ends of both ends of the headrest frame 7, that is, left and right portions of the headrest frame 7, so that the headrest 4 mounted on the headrest frame 7 can move forward and upward toward the head of the seated person of the vehicle seat. 7B and 7B are connected to the seat back frame 5 through guide portions 8 and 8 so as to be movable in the vertical direction (see FIG. 3). Further, tension springs 9 and 9 are stretched between the lower end portion 7B of the headrest frame 7 and the side frames 5B and 5B of the seat back frame 5 so as to hold the headrest frame 7 in a steady position.

  As shown in FIGS. 3 to 7, the guide portion 8 includes a guide plate 8 </ b> A welded to the vertical pipe portion 5 </ b> A <b> 1 of the upper pipe 5 </ b> A constituting the upper portion of the seat back frame 5, and a flat lower end portion 7 </ b> B of the headrest frame 7. And a sliding pin 8B that is mounted through (see FIG. 7).

  The guide plate 8A has a guide surface 8C that overlaps the outer surface of the flat lower end 7B of the headrest frame 7, and a guide hole 8D that extends in the vertical direction is formed in the guide surface 8C. On the other hand, the sliding pin 8B protrudes outward from the flat lower end 7B of the headrest frame 7 and slidably penetrates the guide hole 8D of the guide plate 8A (see FIG. 7). The sliding pin 8B is attached to the inner end portion and the outer end portion of the sliding pin 8B by being prevented from coming off by washers W, W fixed by set screws S, S, respectively.

  Here, as shown in FIG. 8, the guide hole 8 </ b> D formed in the guide plate 8 </ b> A of the guide portion 8 is such that the headrest 4 (see FIG. 1) moves forward and upward as the headrest frame 7 moves upward. It is bent. The fitting width of the guide hole 8D with respect to the sliding pin 8B gradually decreases from the lower end side, which is the movement start end side, of the headrest frame 7 so that the sliding resistance increases on the upper end side, which is the movement end side. . That is, the fitting width of the guide hole 8D gradually decreases in a wedge shape so that the sliding pin 8B is fitted with a gap on the lower end side and the sliding pin 8B is sandwiched on the upper end side.

  On the other hand, as shown in FIGS. 1 and 2, in the vicinity of the pivot 2 </ b> A that pivotally supports the seat back 3 so as to be tiltable back and forth, the front side of the central portion in the left-right direction of the lower frame 5 </ b> C constituting the lower portion of the seat back frame 5 Is provided with an actuating force generating means 10. The operating force generating means 10 is a means for generating an operating force by using the rearward movement load of the seated person's waist as an input when the vehicle receives a rear-end collision and the seated person of the vehicle seat moves backward due to the reaction. The pressure receiving plate 10A that receives the backward movement load of the waist of the person and the operating force generation mechanism 10B to which the backward movement load is input via the pressure receiving plate 10A.

  The pressure receiving plate 10A is made of, for example, a rectangular synthetic resin plate. As shown in FIGS. 9 and 10, two left and right upper portions of the pressure receiving plate 10A are connected to wires 6B extending in the lateral direction of the contour mat 6 via the connecting rings 10C and 10C. Suspended. On the other hand, the operating force generation mechanism 10B is configured on a vertically long support bracket 10D having a groove-shaped cross-sectional shape with the front side open, and the back plate (reference numeral omitted) is formed by means such as spot welding. It is fixed to the front surface of the lower frame 5C.

  As shown in FIG. 11 and FIG. 12, the operating force generation mechanism 10B has a fixed shaft 10F mounted through the upper portions of the left and right side walls 10E, 10E of the support bracket 10D, and the lower portions of the left and right side walls 10E, 10E. And a movable shaft 10H mounted through the formed guide holes 10G and 10G extending in the vertical direction. The fixed shaft 10F is pivotally supported by the upper ends of the fixed roller 10J and the upper link 10K. The lower end of the movable roller 10L and the lower link 10M is pivotally supported on the shaft 10H. And the lower end part of the upper link 10K and the upper end part of the lower link 10M are connected via the pivot 10N, and the pressure receiving roller 10P is pivotally supported by this pivot 10N.

  Here, as shown in FIGS. 1 to 3, a pair of tension cable devices 11, 11 for moving the headrest frame 7 up and down in cooperation with the operating force generating mechanism 10 </ b> B of the operating force generating means 10 are provided as operating force transmitting means. It has been. In the tension cable devices 11, 11, one end portions of the outer sheaths 11A, 11A are fixed side by side to the cable stopper pieces 10Q, 10Q (see FIGS. 11 and 12) bent at the upper end portion of the support bracket 10D. ing.

  The other end of one outer sheath 11A having one end fixed to the left side toward the cable stoppers 10Q and 10Q is bent at the upper end of the guide plate 8A constituting the guide portion 8 disposed on the left side. The cable stop piece 8E is fixed to the cable stop piece 8E (see FIGS. 5 and 6), and the fixing position is on the extension line of the guide hole 8D. Similarly, the other end portion of the other outer sheath 11A having one end portion fixed to the right side toward the cable stopper pieces 10Q, 10Q is connected to the upper end portion of the guide plate 8A constituting the guide portion 8 disposed on the right side. It is fixed to a bent cable stop piece 8E (see FIG. 6), and the fixing position is on an extension line of the guide hole 8D.

  As shown schematically in FIG. 13, one end of the inner cables 11B and 11B that are slidably inserted into the outer sheaths 11A and 11A and led out from one end thereof are fixed rollers that constitute the operating force generation mechanism 10B. The front surface side of 10J, the rear surface side of the pressure receiving roller 10P, and the front surface side of the movable roller 10L are wound around and fixed to the back plate 10R of the support bracket 10D.

  On the other hand, as shown in FIGS. 6 and 7, fastening rings 11C are fixed to the other ends of the inner cables 11B and 11B led out from the other ends of the outer sheaths 11A and 11A. The ring 11 </ b> C is fixed to the sliding pin 8 </ b> B constituting the guide portion 8 together with the washer W by a set screw S.

  Here, as shown in FIG. 14, the pair of tension cable devices 11 and 11 cross each other on the back side of the contour mat 6 so that the inner cables 11B and 11B are smoothly pulled without being caught. It is routed with a loose curvature of the state. The upper portions of the tension cable devices 11 and 11 are fixed to the lateral pipe portions 5A3 and 5A3 of the upper pipe 5A constituting the seat back frame 5 using cable clips 12 and 12, respectively.

  In the vehicle seat according to the embodiment configured as described above, the headrest 4 is at a position slightly away from the seated person's head in a normal sitting posture in which the seated person leans back on the seat back 3. Has been placed. In such a normal seating posture, when the vehicle receives a rear-end collision and the back of the seated person moves due to the reaction, the pressure receiving plate 10A of the operating force generating means 10 built in the seat back 3 is moved by the rearward movement load. Move backwards.

  When the pressure receiving plate 10A moves rearward, the pressure receiving roller 10P of the operating force generating mechanism 10B disposed immediately after the pressure receiving plate 10A is pushed from the steady position shown in FIG. 13 to the operating position shown in FIG. 10L moves to the lowered position shown in FIG. As a result, the inner cables 11B and 11B drawn from one end of the tension cable devices 11 and 11 and wound around the pressure receiving roller 10P and the movable roller 10L are greatly bent and pulled in the arrow direction.

  When the inner cables 11B and 11B are pulled, the sliding pin 8B of the guide portion 8 connected to the other end via the fastening ring 11C moves upward along the guide hole 8D (FIGS. 7 and 7). 8), the lower end portions 7B positioned at the left and right end portions of the headrest frame 7 are moved upward in a balanced manner against the tension springs 9 and 9 (see FIGS. 4 and 5). As a result, the headrest support brackets 7C and 7C smoothly move upward together with the headrest frame 7 while being guided by the guide rings 5A4 and 5A4, and the headrest 4 attached to the headrest support brackets 7C and 7C via the headrest stays 4A and 4A is provided. It moves smoothly and reliably instantly forward and upward toward the head of the seated person.

  At that time, as shown in FIG. 8, the fitting width of the guide hole 8D with respect to the slide pin 8B of the guide portion 8 slides from the lower end side which is the movement start end side of the headrest frame 7 to the upper end side which is the movement end side. Since the wedge pin gradually decreases so as to increase the resistance, the moving speed of the slide pin 8B decreases as it moves upward, and rebound and rattling are suppressed on the upper end side of the guide hole 8D. For this reason, the moving speed of the headrest 4 decreases as the headrest 4 moves upward together with the headrest frame 7, and rebound and rattling are suppressed on the moving end side, and the headrest 4 is reliably stopped at the intended position.

  Thus, according to the vehicle seat of one embodiment, when the vehicle is subjected to a rear-end collision, the headrest 4 together with the headrest frame 7 is moved smoothly and surely forward and forward toward the seated person's head. Further, since it can be surely stopped without being rebounded or rattled at the intended position on the movement end side, the impact applied to the neck of the seated person can be reliably mitigated.

It is a perspective view which shows the principal part structure of the vehicle seat which concerns on one Embodiment of this invention. It is a perspective view which shows the internal structure of the seat back shown in FIG. It is a front view which shows the internal structure of the seat back shown in FIG. It is a perspective view which shows the structure of the vicinity of the headrest support bracket shown in FIG. It is the perspective view which looked at the guide part shown in FIG. 3 from the front side. It is the perspective view which looked at the guide part shown in FIG. 3 from the back side. It is sectional drawing which shows the structure of the guide part shown in FIG. It is a partial side view of the guide part which shows the shape of the guide hole shown in FIG. It is the perspective view which looked at the pressure receiving plate of the operating force generation means shown in FIG. 1 from the front side. It is the perspective view which looked at the pressure receiving plate of the operating force generation means shown in FIG. 1 from the back side. It is the perspective view which looked at the operating force generation mechanism of the operating force generation means shown in FIG. 1 from the front side. It is a front view of the operating force generation mechanism of the operating force generation means shown in FIG. It is a side view which shows typically the structure of the operating force generation mechanism of the operating force generation means shown in FIG. It is a rear view of the upper part of the seat back frame which shows the routing condition of the tension | pulling cable apparatus shown in FIG. FIG. 14 is a side view schematically showing an operating state of the operating force generation mechanism shown in FIG. 13.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat cushion 2 Tilt mechanism 2A Pivot 3 Seat back 4 Headrest 4A Headrest stay 5 Seat back frame 5A Upper pipe 5B Side frame 5C Lower frame 6 Contour mat 7 Headrest frame 7C Headrest support bracket 8 Guide part 8A Guide plate 8B Slide pin 8C Guide Surface 8D Guide hole 10 Operating force generating means 10A Pressure receiving plate 10B Operating force generating mechanism 10D Support bracket 10J Fixed roller 10K Upper link 10L Movable roller 10M Lower link 10P Pressure receiving roller 11 Pulling cable device (operating force transmitting means)
11A Outer sheath 11B Inner cable

Claims (2)

  A vehicle seat in which a headrest is mounted on a seatback, and a headrest support bracket for mounting the headrest is provided in the seatback so that the headrest can move toward the seated person's head. A headrest frame that is movably connected to the seat back frame via a guide portion, an operating force generating means that generates an operating force by using a backward movement load of the seated person, and a linkage with the operating force generating means. Operating force transmission means for moving the headrest frame is provided, and the guide portion includes a guide plate having a guide hole, and a pin that is movably fitted in the guide hole, The sliding resistance against the pin is configured to increase on the movement end side from the movement start end side of the headrest frame. Vehicle seat, characterized in that.   2. The vehicle seat according to claim 1, wherein the guide hole is configured such that a fitting width with respect to the pin is reduced on a movement end side than a movement start end side of the headrest frame. Vehicle seat.

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