JP4482019B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat mounted on a vehicle.

  For example, the following Patent Document 1 discloses an example of a so-called “active headrest” that moves the headrest substantially forward of the vehicle when the vehicle collides from behind, and narrows the distance between the head of the vehicle occupant and the headrest. .

  In this type of active headrest, the lumbar support mechanism is rotatably supported around an axis whose axial direction is the left-right direction inside the seat back, and the lumbar support mechanism is urged forward by a spring. . When the vehicle occupant suddenly moves to the rear of the vehicle due to inertia such as a collision from behind, the load applied to the seat back rotates the lumbar support mechanism backward against the biasing force of the spring. A pair of pulleys around which a wire having one end connected to a lumbar support is wound apart from each other.

The other end of the wire is pulled greatly by separating the pair of pulleys, and thereby the headrest vertical adjustment mechanism connected to the other end of the wire is pulled. In this way, when the headrest vertical adjustment mechanism connected to the wire is pulled, the vertical adjustment mechanism moves to the rear side of the seat, and in conjunction with this, the headrest moves to the front side of the vehicle.
JP 2005-212596 A

  By the way, in the above vertical adjustment mechanism, the pins provided at the left and right ends of the mechanism base are inserted into the guide holes of the pair of mounting brackets attached to the back frame, and the pins are guided to these guide holes. The vertical adjustment mechanism moves back and forth of the seat while the mechanism base moves up and down.

  For this reason, the difference in frictional resistance between the inner periphery of each of the left and right guide holes and the pin, the guide hole and the pin, the dimensional error of each member such as the back frame and the mounting bracket, and the assembly of the pin to the mechanism base When the vertical adjustment mechanism is raised due to errors or mounting bracket assembly errors with respect to the back frame, the vertical adjustment is such that one of the left and right sides of the vertical adjustment mechanism is positioned below the other side. It could happen to the mechanism. Since such an inclination hinders the smooth movement of the vertical adjustment mechanism, and consequently the smooth movement of the headrest, there is still much room for improvement.

  An object of the present invention is to obtain a vehicle seat provided with an active headrest mechanism that can smoothly move the headrest in consideration of the above facts.

  The vehicle seat according to the first aspect of the present invention includes a seat body in which a headrest having a pair of left and right legs is connected to the seat back on the upper side of the seat back via the pair of legs. A load detecting means provided on the seat back and having a movable portion that is displaced in a predetermined direction by receiving a load from the front side of the seat back, and a moving body that moves in the predetermined direction in conjunction with the displacement of the movable portion And a pair of interlocking members, each of which engages with the movable body and moves in conjunction with the movable body, and one of the pair of leg portions by one movement of the pair of interlocking members. And a lifting mechanism that raises the other side of the pair of legs by moving the other of the pair of interlocking members, and the headrest side of the pair of legs as the pair of legs rises Displace forward And it includes a front displacement means, a to.

  In the vehicle seat according to the first aspect of the present invention, a load from the front is applied to the seat back of the seat body, and when this load acts on the load detection means, the movable portion of the load detection means is displaced. In conjunction with the displacement of the movable part, the moving body constituting the lifting mechanism is displaced in a predetermined direction. Since the pair of interlocking members are engaged with the moving body, each of the pair of interlocking members moves in conjunction with the displacement of the moving body when the moving body is displaced in a predetermined direction. One movement of the pair of interlocking members raises one side of the pair of leg portions, and the other movement of the pair of interlocking members raises the other side of the pair of leg portions. Thus, when each of the pair of legs is raised, the headrest rises, but when the pair of legs rises, the side of the headrest is displaced forward by the front displacement means. Thereby, the headrest is displaced in a direction approaching the head of the occupant seated on the vehicle seat.

  As described above, in the vehicle seat according to the present invention, since the force required for ascending is applied to both sides of the pair of leg portions, the pair of leg portions move smoothly and reliably. Displace smoothly and reliably forward.

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the movement amount of each of the pair of interlocking members according to the displacement of the movable body is set to be the same. It is characterized by.

  In the vehicle seat according to the second aspect of the present invention, when the moving body is displaced, the pair of interlocking members move in conjunction with the displacement of the moving body. However, the movement amount of one interlocking member and the other interlocking are moved. Since the movement amount of the member is set to be the same, the rising amount on one side of the pair of leg portions and the rising amount on the other side can be easily set to be the same. Thereby, the force required for the raise given to both sides of a pair of leg parts can be easily made into the same magnitude | size.

  A vehicle seat according to a third aspect of the present invention is the vehicle seat according to the first or second aspect, wherein the direction along the vertical direction of the seat body is set as the moving direction of the movable body. A pair of rotating arms coupled to the movable body so as to be pivotable about an axis whose axial direction is the front-rear direction of the seat body, and pivoting as the movable body moves up and down, It is characterized by that.

  In the vehicle seat according to the third aspect of the present invention, when the movable portion of the load detecting means is displaced, the movable body is displaced (that is, raised or lowered) in the direction along the vertical direction of the seat body. Each of the pair of rotating arms as the pair of interlocking members is connected to the moving body so as to be rotatable around an axis whose axial direction is the front-rear direction of the seat body, and the moving body is interlocked with the displacement of the movable portion. Is displaced (that is, ascending or descending), the pair of rotating arms are rotated, and one side of the pair of legs is raised along with the rotation of one of the pair of rotating arms, The other side of the pair of legs rises with the other rotation of the moving arm. Thus, when each of the pair of legs is raised, the headrest rises, but when the pair of legs rises, the side of the headrest is displaced forward by the front displacement means. Thereby, the headrest is displaced in a direction approaching the head of the occupant seated on the vehicle seat.

  Here, in the vehicle seat according to the present invention, since the pair of rotating arms are rotatably connected to the moving body, the both sides of the pair of leg portions according to the displacement amount of the moving body are used. It is easy to set the amount of increase.

  As described above, in the vehicle seat according to the first aspect of the present invention, the pair of leg portions of the headrest can be moved smoothly and reliably, and the headrest can be smoothly and reliably displaced forward. it can.

  In the vehicular seat according to the second aspect of the present invention, the force required for ascending applied to both sides of the pair of leg portions can be easily made equal.

  In the vehicle seat according to the third aspect of the present invention, since the pair of rotating arms are rotatably connected to the moving body, the pair of legs are lifted on both sides according to the amount of displacement of the moving body. The amount can be set easily.

[Configuration of First Embodiment]
<Basic configuration of vehicle seat 10>
FIG. 1 is a perspective view showing a configuration of a main part of a vehicle seat 10 according to the first embodiment of the present invention.

  As shown in this figure, the vehicle seat 10 includes a seat back 12 as a seat body. The seat back 12 includes a seat back frame 14 that constitutes a skeleton member of the seat back 12. The seat back frame 14 includes a pair of side frames 16. These side frames 16 are formed in a plate shape in the thickness direction along the width direction of the vehicle seat 10, and are arranged to face each other in the width direction of the vehicle seat 10.

  A lower frame 18 is provided on the lower end side of these side frames 16. The lower frame 18 is formed in a plate shape in the thickness direction along the front-rear direction of the vehicle seat 10. One end in the longitudinal direction of the lower frame 18 is fixed to one side frame 16, and the other end in the longitudinal direction of the lower frame 18 is fixed to the other side frame 16. Thereby, the lower end sides of both side frames 16 are integrally connected by the lower frame 18.

  An upper pipe 20 is provided on the upper end side of both side frames 16. The upper pipe 20 is formed by bending a pipe member having a circular cross section into a substantially concave shape (or a substantially U shape) so as to open toward the lower side of the vehicle seat 10. One end in the longitudinal direction of the upper pipe 20 is fixed to the upper end of one side frame 16, and the other end in the longitudinal direction of the upper pipe 20 is fixed to the upper end of the side frame 16. Thereby, the upper ends of both side frames 16 are integrally connected by the upper pipe 20.

  The seat back frame 14 having the above configuration is covered with a pad portion 22 formed of urethane resin or the like, and the pad portion 22 is further covered with a skin material (not shown) formed of cloth or leather.

  A headrest 26 constituting an active headrest device 24 as a headrest movable mechanism is disposed on the upper side of the seatback 12 having the above configuration. The occupant's rear head seated on a seat cushion (not shown) provided below the seat back 12 can lean against the headrest 26.

<Configuration of active headrest device 24>
(Configuration of the load detection unit 28)
As shown in FIG. 1, an active headrest device 24 including a headrest 26 includes a load detection unit 28 as a load detection unit. The load detection unit 28 includes a detection unit main body 30 and a pressure receiving plate 32. Here, FIG. 2 is an enlarged perspective view of the detection unit main body 30, and FIG. 3 is an exploded perspective view of the detection unit main body 30.

  As shown in these drawings, the detection unit main body 30 includes a light housing 34. The light housing 34 includes a bottom wall 36 whose thickness direction is along the width direction of the vehicle seat 10. The light housing 34 includes a peripheral wall 38. The peripheral wall 38 is formed along the outer peripheral portion of the bottom wall 36. For this reason, the light housing 34 has a bottomed shape that opens toward the left side of the vehicle seat 10. A left housing 40 is provided on the left side of the right housing 34 along the width direction of the vehicle seat 10. The left housing 40 includes a bottom wall 42 whose thickness direction is along the width direction of the vehicle seat 10. The left housing 40 includes a peripheral wall 44. The peripheral wall 44 is formed along the outer peripheral portion of the bottom wall 42. For this reason, the left housing 40 has a bottomed shape that opens toward the right side of the vehicle seat 10.

  A fixed portion 46 is formed on the outer peripheral portion of the peripheral wall 44. A fixing pin (not shown) protrudes from the fixing portion 46 toward the right in the width direction of the vehicle seat 10. A fixing portion 48 is formed on the outer peripheral portion of the peripheral wall 38 corresponding to the fixing portion 46 in which the fixing pin is formed. A hole opened toward the left in the width direction of the vehicle seat 10 is formed in the fixing portion 48, and a fixing pin of the fixing portion 46 enters the hole to fix the left housing 40 to the right housing 34. The housing 34 and the left housing 40 are closed to each other at their open ends, and have a hollow shape as a whole.

  Further, attachment pieces 50 are formed on the fixing portion 48 of the right housing 34 and the fixing portion 46 of the left housing 40, respectively. The bolts that pass through the mounting piece 50 further pass through the lower frame 18 and the nuts are screwed together, whereby the right housing 34 and the left housing 40 are fixed to the lower frame 18.

  On the other hand, the detection unit main body 30 includes a swing piece 54. The swing piece 54 includes a swing piece main body 56. The swing piece main body 56 is formed with a shaft portion 58 that is axial along the width direction of the vehicle seat 10. Corresponding to one end of the shaft portion 58, the bottom wall 36 of the light housing 34 is formed with a bearing portion 60 having a circular cross section that opens toward the left along the width direction of the vehicle seat 10. On the other hand, a bearing portion 62 having a circular cross section that opens toward the right along the width direction of the vehicle seat 10 is formed on the bottom wall 42 of the left housing 40 corresponding to the other end of the shaft portion 58. It is formed coaxially with respect to 60. The bearing portion 60 pivotally supports one end of the shaft portion 58 and the bearing portion 62 pivotally supports the other end of the shaft portion 58.

  On the opposite side of the swing piece main body 56 from the shaft portion 58, a rectangular opening formed by a notch portion 64 formed in the peripheral wall 38 of the right housing 34 and a notch portion 66 formed in the peripheral wall 44 of the left housing 40. Projecting from the portion 68 to the outside of the right housing 34 and the left housing 40. Further, a connecting portion 70 is formed on the opposite side of the swing piece main body 56 from the shaft portion 58, and the connecting shaft 74 of the slider 72 as the movable portion is an axis whose axial direction is the width direction of the vehicle seat 10. It is connected to the connecting part 70 so as to be rotatable around. The side of the slider 72 opposite to the connecting shaft 74 passes through the opening 68 and enters the inside of the right housing 34 and the left housing 40.

  A shaft mounting portion 76 is formed on the opposite side of the slider 72 from the connecting shaft 74, and a slide shaft 78 that is axial along the width direction of the vehicle seat 10 is provided on the shaft mounting portion 76. . A guide groove 80 that opens toward the left along the width direction of the vehicle seat 10 is formed in the bottom wall 36 of the light housing 34 corresponding to one axial end of the shaft attachment portion 76.

  On the other hand, a guide groove 82 is formed on the bottom wall 42 of the left housing 40 so as to correspond to the other end of the shaft portion 58 and is open to the right along the width direction of the vehicle seat 10. Both of the guide grooves 80 and 82 have a long hole shape extending in the longitudinal direction along the height direction of the vehicle seat 10, and the inner width dimension of each short width direction is larger than the outer diameter dimension of the slide shaft 78. The guide groove 80 can guide one end of the slide shaft 78 that has entered the guide groove 80 in the longitudinal direction of the guide groove 80, and the guide groove 82 can guide the other end of the slide shaft 78 that has entered the guide groove 82. 82 can be guided in the longitudinal direction.

  In the state where the slide shaft 78 is positioned on the side close to the bearing portions 60, 62 among the longitudinal ends of the long guide grooves 80, 82, the connecting portion 70 is moved inward of the right housing 34 and the left housing 40. When pressed so as to push in, the connecting shaft 74 of the slider 72 moves inward of the right housing 34 and the left housing 40 together with the connecting portion 70 while rotating with respect to the connecting portion 70. Along with this movement, the shaft mounting portion 76 is structured to move while being guided by the guide grooves 80 and 82 so as to be separated from the shaft portion 58 supported by the bearing portions 60 and 62 together with the slide shaft 78.

  The pressure receiving plate 32 is provided on the front side of the connecting portion 70 protruding from the opening 68. The pressure receiving plate 32 is formed in a plate shape in the thickness direction along the front-rear direction of the vehicle seat 10, and one surface (rear surface) in the thickness direction faces the connecting portion 70. As shown in FIG. 4, a recess 84 is formed in the pad portion 22 of the seat back 12 corresponding to the pressure receiving plate 32. The concave portion 84 is engaged with the lower frame 18 of the pad portion 22 and is open on the back surface of the pad portion 22 above the engaging portion 86 supported by the lower frame 18.

  As shown in FIG. 5, a supporter 88 is provided in the recess 84. The supporter 88 is formed of a metal or synthetic resin material harder than the pad portion 22 and is fixed to the inner surface of the recess 84 with an adhesive or the like, or the supporter 88 is insert-molded when the pad portion 22 is formed. Thus, the supporter 88 is provided inside the recess 84. The supporter 88 has a concave shape that opens in substantially the same direction as the opening direction of the concave portion 84. Further, the inner peripheral shape of the supporter 88 is smaller than the outer peripheral shape of the pressure receiving plate 32.

  However, in the vicinity of the bottom portion of the supporter 88, a mounting groove 90 opened toward the inside in the opening diameter direction of the supporter 88 is continuously formed along the inner peripheral direction of the supporter 88, and the pressure receiving plate 32 is formed on the outer peripheral portion. And its vicinity enters the inside of the mounting groove 90 and is held by the supporter 88. When the pressing force is transmitted to the pressure receiving plate 32 from the side opposite to the opening direction of the supporter 88, that is, from the front side of the vehicle seat 10 through the pad portion 22 and the bottom portion of the supporter 88, the receiving portion plate 32 is opposed to the connecting portion. It becomes the structure which approaches 70 and presses the connection part 70. FIG.

  On the other hand, as shown in FIG. 3, the above-described slide shaft 78 passes through the hole 98 formed in the plate 100, and the plate 100 moves along with the slide shaft 78 while being guided by the guide grooves 80 and 82. The cable 96 is pulled by the slide shaft 78, and the pull of the cable 96 by the slide shaft 78 is released. The cable 96 passes through the tube 102 and the other end is guided to the sliding unit 110.

(Configuration of sliding unit 110)
FIG. 6 is an exploded perspective view showing the configuration of the sliding unit 110 as an elevating mechanism.

  As shown in this figure, the sliding unit 110 includes a pair of left and right unit brackets 112. These unit brackets 112 are appropriately curved or bent plate-like members. One unit bracket 112 is fixed to the upper pipe 20 with a screw or the like on one side frame 16 side, and the other unit bracket 112 is connected to the other unit bracket 112. The side frame 16 is fixed to the upper pipe 20 with screws or the like.

  A base plate 114 is attached to these unit brackets 112. Although the thickness direction of the base plate 114 is basically along the front-rear direction of the vehicle seat 10, the base plate 114 is a plate material that is appropriately bent or curved. A pair of left and right bracket guides 116 are provided on the front side of the base plate 114. One of the pair of bracket guides 116 is fixed to the base plate 114 by screws or the like on the side of the one side frame 16, and the other bracket guide 116 is fixed to the base plate 114 by screws or the like on the side of the other side frame 16. ing.

  These bracket guides 116 are formed with a guide body 118 having a concave cross section that opens toward the base plate 114. Corresponding to the guide body 118, the base plate 114 is formed with a base-side guide portion 120 bent into a concave cross-section opening toward the bracket guide 116 side. The base side guide part 120 is formed to face the guide part main body 118, and a headrest bracket 122 as a leg part is disposed between the guide part main body 118 and the base side guide part 120.

  The headrest bracket 122 is formed in a cylindrical shape having a rectangular cross section which is formed in a longitudinal direction substantially in the vertical direction of the vehicle seat 10. The outer peripheral shape of the headrest bracket 122 is sufficiently smaller than the inner peripheral shape in a state in which the guide main body 118 and the base-side guide portion 120 face each other, and the headrest bracket 122 is formed inside the guide main body 118 and the base-side guide portion 120. The headrest bracket 122 can be moved in the front-rear direction of the vehicle seat 10 until it can be moved in the vertical direction of the vehicle seat 10 and is interfered by the guide portion main body 118 and the base side guide portion 120.

  A wall-like guide portion 124 is formed on the base plate 114 on the upper end side of the base-side guide portion 120. One end of the guide part 124 is connected to the upper end of the bottom part of the base side guide part 120. The other end of the guide portion 124 is located above and forward of the vehicle seat 10 with respect to the one end, and the other end portion of the guide portion 124 abuts against a part of the outer periphery of the headrest bracket 122. A bracket guide portion 126 is formed on the base plate 114 on the other end side of the guide portion 124. The bracket guide portion 126 has a concave shape that opens toward the guide portion main body 118 in the same manner as the base side guide portion 120. However, the inner width dimension of the bracket guide portion 126 along the width direction of the vehicle seat 10 is as follows. The width of the headrest bracket 122 along the same direction is slightly larger than the width.

  On the other hand, a shaft 128 is provided integrally with the headrest bracket 122 at the rear in the vicinity of the lower end portion of the headrest bracket 122. The shaft 128 is rotatably supported by a slider 130 formed in a block shape having a rectangular shape in front view that constitutes a forward displacement means. Corresponding to the slider 130, the bracket guide 116 is formed with a slider guide portion 132 that constitutes a forward displacement means together with the slider 130. Opposite to the slider guide portion 132, the base plate 114 is formed with a slider guide surface 134 that constitutes a forward displacement means together with the slider 130 and the slider guide portion 132. The slider 130 is interposed between the slider guide portion 132 and the slider guide surface 134, and is slidable in the vertical direction of the vehicle seat 10 while being guided by the slider guide portion 132 and the slider guide surface 134.

  However, the slider guide portion 132 and the slider guide surface 134 are inclined in the vertical direction with respect to the front-rear direction of the vehicle seat 10, so that the slider 130 is composed of the slider guide portion 132 and the slider guide surface. As it is guided by 134 and slides upward, it is displaced rearward of the vehicle seat 10.

  Here, as shown in the schematic diagrams of FIGS. 9A and 9B, the slider 130 is displaced rearward as the slider 130 slides upward, so that the lower end side of the headrest bracket 122 is also displaced rearward. To do. Thus, the headrest bracket 122 is rotated along the concave surface of the bracket guide portion 126 by the rear end being displaced rearward, whereby the headrest bracket 122 is located above the contact portion with the bracket guide portion 126. Rotate forward.

  As shown in FIG. 6, a guide spacer 136 formed in a cylindrical shape with a rectangular cross section is attached to the distal end side (upper end side) of the headrest bracket 122 that operates as described above. It is attached. On the other hand, a connecting bracket 138 is provided behind the base end side (lower end side) of the headrest bracket 122. The connecting bracket 138 is formed in a plate shape that is long in the width direction of the vehicle seat 10 and has a thickness direction in the front-rear direction. One headrest bracket 122 is connected to one end of the connecting bracket 138 and the other end. Is connected to the other headrest bracket 122.

  A cover plate 140 is disposed behind the connecting bracket 138 in the approximate center in the longitudinal direction. Further, behind the cover plate 140, arms 142 and 144 constituting interlocking members are disposed as rotating arms. . The arm 142 is pivotally supported by the base plate 114 so as to be rotatable about an axis whose axial direction is substantially the front-rear direction of the vehicle seat 10 on the right side of the center in the width direction of the vehicle seat 10. On the other hand, the arm 144 is pivotally supported by the base plate 114 so as to be rotatable about an axis whose axial direction is substantially the front-rear direction of the vehicle seat 10 on the left side of the substantially center of the vehicle seat 10 in the width direction. . The arm 144 has basically the same shape as the arm 142, but is arranged symmetrically with respect to the arm 142 about the substantially central portion in the left-right direction of the vehicle seat 10.

  On the left side of the arm 142 along the width direction of the vehicle seat 10, a connecting piece 146 that forms a rotating arm together with the arm 142 is provided. The connecting piece 146 is connected at one end thereof so as to be rotatable relative to the arm 142 around an axis whose axial direction is the front-rear direction of the vehicle seat 10. On the other hand, on the right side of the arm 144 along the width direction of the vehicle seat 10, a connecting piece 148 that forms a rotating arm together with the arm 144 is provided. One end of the connecting piece 148 is connected so as to be rotatable relative to the arm 144 around an axis whose axial direction is the front-rear direction of the vehicle seat 10. Further, the distance from the rotation center of the arm 144 to the connection portion with the connection piece 148 is set to the same distance as the distance from the rotation center of the arm 142 to the connection portion with the connection piece 146.

  The other end side of the connecting piece 146 (the side opposite to the connecting portion with the arm 142) and the other end side of the connecting piece 148 (the opposite side to the connecting portion with the arm 144) are the front and rear of the vehicle seat 10. The slide pin 150 as a moving body passes through the portion where the connecting piece 146 and the connecting piece 148 overlap each other in the front-rear direction of the vehicle seat 10. Moreover, the distance from the connecting portion of the connecting piece 146 to the arm 142 to the connecting portion to the slide pin 150 is the same as the distance from the connecting portion of the connecting piece 148 to the arm 144 to the connecting portion to the slide pin 150. Is set.

  A long hole 152 is formed in the base plate 114 in the longitudinal direction along the vertical direction of the vehicle seat 10 so as to correspond to the slide pin 150, and the connection piece 148 is connected through the connection pieces 146 and 148. The slide pin 150 protruding to the opposite side of the piece 146 enters the elongated hole 152. Therefore, the slide pin 150 can move (slide) only along the longitudinal direction of the long hole 152. Further, the other end of the cable 96 described above is locked to the slide pin 150, and the slide pin 150 moves up and down in the long hole 152 when the cable 96 moves in the longitudinal direction.

  On the other hand, the other end of the arm 142 (the end opposite to the connection portion with the connection piece 146 via the rotation center of the arm 142) and the other end of the arm 144 (the connection piece via the rotation center of the arm 144). Hole portions 154 are formed in each of the end portions on the side opposite to the connecting portion with 148. Moreover, the distance from the center of rotation of the arm 142 to the hole 154 of the arm 142 and the distance from the center of rotation of the arm 144 to the hole 154 of the arm 144 are set to the same length.

  Each hole 154 is provided with a taper pin 156. The taper pin 156 is formed by covering a pin body, which is formed of metal or a synthetic resin material, and has a base end portion attached to the arms 142 and 144 with a covering portion formed of the synthetic resin material. The covering portion of the taper pin 156 is tapered toward the side opposite to the base plate 114. These taper pins 156 enter into each of a pair of long holes 158 formed in the connecting bracket 138.

  One of the pair of long holes 158 is formed on one end side with respect to the longitudinal center of the connecting bracket 138, and the other long hole 158 is formed on the other end side with respect to the longitudinal center of the connecting bracket 138. These long holes 158 are elongated along the width direction of the vehicle seat 10, and the inner width dimension in the shorter width direction is smaller than the outer diameter dimension at the proximal end portion of the taper pin 156. The taper-shaped taper pin 156 that has entered the elongated hole 158 has a tapered surface that is in pressure contact with the inner peripheral edge of the elongated hole 158.

  When the slide pin 150 is raised and lowered while being guided by the long hole 152, the connecting piece 146 rotates the arm 142 while appropriately rotating according to the interval between the rotation center of the arm 142 and the slide pin 150, and the connecting piece 148 rotates the arm 144 while appropriately rotating according to the distance between the rotation center of the arm 144 and the slide pin 150. Thus, the other end of each arm 142, 144 is rotated, so that the taper pin 156 presses the inner peripheral portion of the elongated hole 158 to move the connecting bracket 138 up and down.

[Operation and Effect of First Embodiment]
Next, the operation and effect of the present embodiment in terms of operation will be described through the description of the operation of the active headrest device 24.

  In the vehicle seat 10 provided with the active headrest device 24, for example, the body of an occupant seated on the vehicle seat 10 due to a reaction such as a vehicle on which the vehicle seat 10 is mounted is collided with another vehicle from behind. When the seat back 12 is pressed from the front side (that is, when the occupant seated on the vehicle seat 10 leans on the seat back 12 swiftly), the pressure receiving plate 32 receiving the pressing force from the occupant's body moves backward. To do. The pressure receiving plate 32 moved rearward presses the connecting portion 70 of the swing piece 54 rearward.

  The oscillating piece 54 having the connecting portion 70 pressed against the pressure receiving plate 32 rotates the slider 72 around the shaft portion 58, whereby the slider 72 connected to the connecting portion 70 moves the slide shaft 78 through the guide grooves 80 and 82. Move to the other end side. Thus, when the slide shaft 78 moves, the cable 96 is pulled through the plate 100. By pulling the cable 96, as shown in FIG. 8 from the state shown in FIG. 7, when the slide pin 150 is guided and lowered by the long hole 152, the slide pin 150 pulls the connecting pieces 146 and 148 downward. To lower. The connecting pieces 146 and 148 are lowered to pull the arms 142 and 144 downward to rotate the arms 142 and 144.

  As the arm 142 rotates, the connecting portion of the arm 142 with the connecting piece 146 is not only lowered, but also displaced in the width direction (left-right direction) of the vehicle seat 10. Therefore, the distance from the connecting portion of the arm 142 to the connecting piece 146 along the width direction of the vehicle seat 10 to the connecting piece 146 and the slide pin 150 (that is, the connecting portion to the connecting piece 146 of the arm 142 to the connecting piece). 146 and the component of the distance from the slide pin 150 along the width direction of the vehicle seat 10) change, but according to this change, the connecting piece 146 changes the connecting portion with the slide pin 150 and the connecting portion with the arm 142. It rotates appropriately as the center. As a result, the above change is absorbed, and the arm 142 rotates smoothly.

  Further, when the arm 144 is rotated, the connecting portion of the arm 144 with the connecting piece 148 is not only lowered but also displaced in the width direction (left and right direction) of the vehicle seat 10, but the arm 142 and the connecting piece 146 Similarly, when the connecting piece 148 is appropriately rotated around the connecting portion with the slide pin 150 and the connecting portion with the arm 144, the arm 144 is smoothly rotated.

  As described above, the end of the arm 142 on the side of the connecting piece 146 is rotated so that the end of the arm 142 on the side opposite to the connecting piece 146 is rotated so that the end of the arm 142 is raised. By rotating the end of the connecting piece 148 so as to descend, the end of the arm 144 opposite to the connecting piece 148 rotates so as to rise. As a result, the taper pins 156 attached to the other ends of the arms 142 and 144 push up the inner peripheral portion of the elongated hole 158, that is, the connecting bracket 138. When the connecting bracket 138 is pushed up, both headrest brackets 122 move upward. As the headrest bracket 122 moves upward, the slider 130 is guided by the slider guide portion 132 and the slider guide surface 134 and slides upward. To do.

  As described above, as the slider 130 is guided by the slider guide portion 132 and the slider guide surface 134 and slides upward, the slider 130 is displaced to the rear side of the vehicle seat 10, and accordingly, the lower end side of the headrest bracket 122 is also rearward. Displace to In this way, the headrest bracket 122 moves upward while the lower end side is displaced rearward, so that the headrest bracket 122 rotates along the concave surface of the bracket guide portion 126, and thereby, from the contact portion with the bracket guide portion 126. On the upper side, the headrest bracket 122 rotates forward. Thereby, the headrest 26 connected to the headrest bracket 122 via the guide spacer 136 is displaced forward.

  If the back of the occupant seated on the vehicle seat 10 is not in contact with the headrest 26 before the headrest 26 is displaced forward (if the back of the occupant is positioned forward of the headrest 26) ) When the headrest 26 is displaced forward as described above, the headrest 26 approaches the occupant's back head, and the gap between the headrest 26 and the occupant's back head is reduced. As a result, even when the head of an occupant seated on the vehicle seat 10 moves backward due to a reaction such as a rear-end collision with another vehicle, the occupant quickly moves with the headrest 26 without greatly moving the head backward. You can catch the head of.

  Here, in the active headrest device 24 applied to the vehicle seat 10, the arm 142 pushes up one headrest bracket 122 and the arm 144 pushes up the other headrest bracket 122 as the slide pin 150 descends. Thus, when both headrest brackets 122 are pushed up at the same time, the headrest bracket 122 is not twisted right and left when the headrest bracket 122 is pushed up. Thereby, the headrest bracket 122 can be pushed up smoothly and reliably, and the headrest 26 can be reliably displaced forward.

  In addition, as described above, the arms 142 and 144 and the connecting pieces 146 and 148 have a symmetrical shape (distance) such as the shape and connecting position with each member including the slide pin 150, and the corresponding dimensional relationship is the same. Therefore, when the slide pin 150 is slid (displaced), the rotation mode of the connecting piece 146 and the arm 142 and the rotation mode of the connecting piece 148 and the arm 144 are bilaterally symmetrical and the rotation amount is the same. Become. Therefore, the timing at which the arm 142 pushes up one headrest bracket 122 and the stroke for pushing up (push-up amount) are the same as the timing at which the arm 144 pushes up the other headrest bracket 122 and the stroke for pushing up (push-up amount). For this reason, compared with the structure which pushes up both the headrest brackets 122 simultaneously, generation | occurrence | production of the twist in the left and right headrest brackets 122 can be prevented more reliably or effectively suppressed.

  Further, basically, the arms 142 and 144 and the connecting pieces 146 and 148 as described above are configured so that both the headrest brackets 122 are provided only by the shape and the dimensional (distance) relationship such as the connecting position with each member including the slide pin 150. The push-up timing and push-up stroke can be set accurately. For this reason, it is possible to reduce an error between the timing for pushing up one headrest bracket 122 and the stroke for pushing up, and the timing for pushing up the other headrest bracket 122 and the stroke for pushing up.

  Further, in the active headrest device 24 applied to the vehicle seat 10, the tapered surface of the tapered pin 156 entering the elongated hole 158 is in pressure contact with the inner peripheral edge of the elongated hole 158. For this reason, the inner peripheral part of both the long holes 158 can be pressed by the long holes 158 simultaneously with the start of the rising of both the taper pins 156. Also by this, the headrest bracket 122 can be surely pushed up at the same time, and the headrest 26 can be reliably displaced forward.

  Furthermore, in the active headrest device 24 applied to the vehicle seat 10, the slider 130 is rectangular in front view. For this reason, the contact area with the slider guide part 132 and the slider guide surface 134 according to the length of the side along the slider guide part 132 and the slider guide surface 134 among the four sides of the slider 130 in the front view is provided. For this reason, the surface pressure in the contact part with the slider guide part 132 and the slider guide surface 134 can be reduced. Thereby, the slider 130 can be reliably slid, and as a result, the headrest bracket 122 can be reliably raised and displaced forward.

  In addition, since the taper-shaped taper pin 156 that has entered the long hole 158 has a tapered surface that is in pressure contact with the inner peripheral edge of the long hole 158, the connecting bracket 138 can suppress the backlash that occurs in the arm 142 and the arm 144 in the normal state. it can. Thereby, the quiet performance in normal time can be improved.

It is a perspective view showing the outline of the important section of the vehicular seat concerning a 1st embodiment of the present invention. It is a perspective view of the detection part of the load detection means of the vehicle seat which concerns on the 1st Embodiment of this invention. It is a disassembled perspective view of the detection part of the load detection means of the vehicle seat which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the pressure receiving part and pad of the load detection means of the vehicle seat which concern on the 1st Embodiment of this invention. It is sectional drawing of the pressure receiving part and pad of the load detection means of the vehicle seat which concern on the 1st Embodiment of this invention. It is a disassembled perspective view of the sliding unit of the vehicle seat which concerns on the 1st Embodiment of this invention. It is a schematic front view of the principal part of a sliding unit. It is a front view corresponding to FIG. 7 which shows the state which the sliding unit act | operated. It is a figure which shows a sliding unit typically, (A) shows before operation | movement, (B) is a figure which shows after operation | movement.

Explanation of symbols

10 Vehicle Seat 12 Seat Back (Seat Body)
26 Headrest 28 Load detection unit (load detection means)
72 Slider (movable part)
110 Sliding unit (elevating mechanism)
130 Slider (forward displacement means)
132 Slider guide part (forward displacement means)
134 Slider guide surface (forward displacement means)
142 Arm (Rotating arm, interlocking member)
144 Arm (rotating arm, interlocking member)
146 Connecting piece (rotating arm, interlocking member)
148 Connecting piece (rotating arm, interlocking member)
150 Slide pin (moving body)

Claims (3)

A headrest having a pair of left and right legs, a seat body connected to the seatback on the upper side of the seatback via the pair of legs,
Load detecting means provided on the seat back and having a movable portion that is displaced in a predetermined direction by receiving a load from the front side of the seat back;
A movable body that moves in a predetermined direction in conjunction with the displacement of the movable portion, and a pair of interlocking members that each engage with the movable body and move in conjunction with the movable body, An elevating mechanism that raises one side of the pair of leg portions by one movement of the pair of interlocking members, and raises the other side of the pair of leg portions by the other movement of the pair of interlocking members;
Forward displacement means for displacing the headrest side of the pair of legs forward as the pair of legs rises;
A vehicle seat comprising:   The vehicle seat according to claim 1, wherein the movement amounts of the pair of interlocking members according to the displacement of the moving body are set to be the same.   A direction along the vertical direction of the seat body is set as a moving direction of the movable body, and the movable body is connected to the movable body so as to be rotatable about an axis whose longitudinal direction is the longitudinal direction of the seat body. 3. The vehicle seat according to claim 1, wherein a pair of rotating arms that rotate as the movable body moves up and down are used as the pair of interlocking members.

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