JP4392308B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat having a headrest.

In order to restrain an occupant's head at the time of a rear-end collision of a vehicle, a movable headrest device that moves the headrest forward has been proposed. For example, as described in Patent Document 1 below, there is known a headrest driving mechanism in which a guide pin is provided at a lower portion of a headrest stage and the guide pin is movable along a long hole extending in the vertical direction. Yes. In this conventional example, the passive member is actuated by the inertial load of the occupant at the time of collision, and the guide pin moves upward along the elongated hole so that the headrest moves upward while tilting forward. . (See Patent Document 1 below)
Further, as described in Patent Document 2 below, a headrest driving mechanism is known in which a pressure receiving member is provided on the back of a pad and the armature pipe is pushed up via the pressure receiving member at the time of a collision. In this conventional example, the pin at the middle part in the vertical direction of the armature pipe moves forward and upward along the elongated hole at the time of collision, so that the headrest moves upward while tilting forward. (See Patent Document 2 below)
JP 2001-163099 A JP 2000-21155 A

  In the headrest drive mechanism disclosed in Patent Documents 1 and 2, the headrest operates by sliding the pin along the long hole. In such a sliding structure, it is necessary to set a relatively large clearance between the pin and the long hole in order to ensure the slidability between the pin and the long hole. This clearance rattles the headrest, and causes the occupant's head to become less restrained during a collision.

  Accordingly, it is an object of the present invention to provide a vehicle seat that can ensure the slidability of a headrest drive mechanism having a sliding structure and can prevent the head restraint from being lowered during a collision.

A vehicle seat according to the present invention includes a seat back having a seat back frame, a headrest body provided on an upper portion of the seatback, a headrest having a stage extending below the headrest body, and a support for inserting the headrest stage. A bracket having a back surface abutting against an upper frame member of the seat back frame, a slide guide bracket provided on the seat back frame and supporting the support bracket so as to be movable in a vertical direction, A pressure receiving member that is provided on the seat back and moves rearward when pushed by an occupant, and when the pressure receiving member moves rearward, the support bracket is driven to tilt forward while moving from the reference position toward the raised position. A headrest driving mechanism that Provided to the dynamic guide bracket comprises a pressing portion for biasing said support bracket to said upper frame member, the upper frame member is in contact with said support bracket when the support bracket is in said reference position first 1 and a second contact that comes into contact with the support bracket when the support bracket is moved to the raised position, and the pressing portion is a convex portion having a spring property, and the convex portion is the support bracket. The support bracket is biased toward the region between the first and second contacts by the pressing portion by contacting the front surface of the support bracket at the third contact .

In a preferred embodiment of the present invention, the first contact is positioned above the second contact, and the support bracket moves the first and second when moving from the reference position to the raised position. The sliding guide bracket and the upper frame member are supported so as to be tiltable so that they can tilt in the front-rear direction with the region between the contacts as a fulcrum.

  In a preferred embodiment of the present invention, the sliding guide bracket may be provided with a lateral restricting portion that can contact a side surface of the support bracket.

  For example, the pressing portion and the lateral direction restricting portion are integrally formed of synthetic resin. Or the said press part and the said horizontal direction control part shape | mold a single metal plate which has spring property. Or the said press part and the said horizontal direction control part shape | mold a single metal wire which has spring property. The pressing portion may be a coil spring, and the lateral restriction portion may be a convex portion that protrudes from the inner surface of the side wall of the sliding guide bracket.

  In a preferred embodiment of the present invention, a coating layer having a smaller coefficient of friction than metal is formed at a site where the support bracket and the upper frame member are in contact with each other.

According to the present invention, in a vehicle seat having a headrest drive mechanism having a sliding structure, the slidability of the headrest drive mechanism can be secured, the headrest can be prevented from rattling, and the restraint of the head at the time of a collision is reduced. Can be prevented. The upper frame member has a first contact that contacts the support bracket when the support bracket is at the reference position, and a second contact that contacts the support bracket when the support bracket moves to the raised position. And the pressing portion comprises a convex portion having a spring property, and the convex portion comes into contact with the front surface of the support bracket at a third contact point, whereby the support bracket is moved by the pressing portion by the first and second portions. With the configuration in which the support bracket is biased toward the region between the contacts, when the support bracket moves from the reference position to the raised position, the change in the pressing position before and after the movement is small, and stable pressing is possible. While pressure is obtained, the stress change of the pressing part is small, and the degree of freedom in design can be increased.

A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a vehicle seat 10. The vehicle seat 10 includes a seat portion 11, a seat back 12, and a headrest 13. The headrest 13 includes a headrest main body 14 provided on the upper portion of the seat back 12 and a pair of left and right stages 15 extending below the headrest main body 14.

  2 and 3 show the interior of the seat back 12. The seat back 12 includes a seat back frame 20, a spring assembly 21, a pad member 22 (shown by a two-dot chain line in FIG. 3) arranged to cover the spring assembly 21, and a cover member that covers the outer surface of the pad member 22. 23 (shown in FIG. 1).

  The seat back frame 20 includes a pair of left and right side frame members 30 and 31, an upper frame member 32 positioned on the upper side, a lower frame member 33 positioned on the lower side, and the like. The side frame members 30 and 31 and the lower frame member 33 are formed into a predetermined shape by pressing a metal plate. The upper frame member 32 is made of a pipe having a circular cross section, for example, and both ends thereof are welded to the upper portions of the side frame members 30 and 31. Both ends of the lower frame member 33 are welded to lower portions of the side frame members 30 and 31.

  An example of the spring assembly 21 includes a flat spring 35 and a plurality of tension springs 36. The flat spring 35 is constituted by a plurality of vertical wires 37 extending in the vertical direction and horizontal wires 38 extending in the horizontal direction. Both side portions of the flat spring 35 are supported on the side frame members 30 and 31 by a tension spring 36.

  As shown in FIG. 2, two systems of cables 41 and 42 are arranged inside the seat back 12. FIG. 3 shows one cable 41 as a representative. Each of these cables 41, 42 has an outer tube 43 and a wire 44 inserted into the outer tube 43. The intermediate portions in the longitudinal direction of the cables 41 and 42 are supported by, for example, the upper frame member 32 by a retainer 45 (shown in FIG. 3).

  The wire 44 is an example of a striate body. As shown in FIGS. 2 and 3, the outer tube 43 has one end 43a and the other end 43b. The wire 44 also has one end 44a and the other end 44b.

  As shown in FIGS. 2 to 4, long hole brackets 51 each having a guide hole 50 are provided at both ends of the upper frame member 32 of the seat back frame 20. The guide hole 50 has an inclined shape so that one end 50a thereof is positioned below the other end 50b, and extends substantially linearly in an obliquely vertical direction. A subframe 55 is provided between the pair of long hole brackets 51.

  The subframe 55 includes a horizontal portion 56 extending in the horizontal direction and a pair of arm portions 57 formed at both ends of the horizontal portion 56. The arm portion 57 extends obliquely downward and forward from both ends of the horizontal portion 56. A slide member (for example, a slide pin) 58 is provided at the end of each arm portion 57. The slide member 58 is inserted into the guide hole 50 of the long hole bracket 51. The slide member 58 is engaged with the guide hole 50 so as to be movable in the vertical direction (longitudinal direction of the guide hole) along the guide hole 50 over the one end 50a and the other end 50b of the guide hole 50.

  The long hole bracket 51 has a guide surface 50 c along the longitudinal direction of the guide hole 50. The guide surface 50 c constitutes an inner wall on the front side of the guide hole 50, and the slide member 58 is always in contact with the slide member 58 when the slide member 58 moves upward along the guide hole 50. The slide member 58 is in contact with the guide surface 50c of the guide hole 50 at the contact α shown in FIG.

  When the rear load due to head restraint is input to the headrest main body 14 during or after the slide member 58 moves upward along the guide hole 50, the slide member 58 is pressed against the guide surface 50c. The headrest body 14 is locked.

  In other words, when a rear load is input from the headrest body 14, the friction coefficient between the guide surface 50c and the slide member 58 at the contact α and the contact α at the contact α so that the slide member 58 does not slide and move on the guide surface 50c. Pressure angle, load vector, etc. are set.

  The lower portions of the pair of left and right support brackets 60 are fixed to the horizontal portion 56 of the subframe 55. The stage 15 of the headrest 13 is inserted into each support bracket 60. The support bracket 60 has a cylindrical shape, and a grommet 61 is provided at the upper end. A sliding guide bracket 65 is provided on the upper frame member 32.

  The back surface 60 a of the intermediate portion in the vertical direction of the support bracket 60 is pressed against the upper frame member 32 by the following pressing portion 70. The sliding guide bracket 65 is provided with a sliding guide member 66 made of synthetic resin at a portion in contact with the support bracket 60. Details of the sliding guide member 66 will be described later.

  The support bracket 60 can smoothly slide in the vertical direction with respect to the upper frame member 32 by the sliding guide member 66. That is, the support bracket 60 is movable in the vertical direction from the position before operation (reference position P1 indicated by a solid line in FIG. 6) to the position after operation (ascended position P2 indicated by a two-dot chain line in FIG. 6). .

  As shown in FIG. 6, the upper frame member 32 has a first contact C1 and a second contact C2. When the support bracket 60 is at the reference position P1, the back surface 60a of the support bracket 60 is in contact with the first contact C1 of the upper frame member 32. When the support bracket 60 moves to the raised position P2, the back surface 60a of the support bracket 60 contacts the second contact C2 of the upper frame member 32. The first contact C1 is located above the second contact C2.

  In addition, when the support bracket 60 moves from the reference position P1 to the ascending position P2, a certain angle range θ1 in the front-rear direction with the region S between the contacts C1 and C2 of the upper frame member 32 as a fulcrum (see FIG. 3). As shown in FIG. 6, it is supported by the sliding guide bracket 65 and the upper frame member 32 so as to be tiltable.

  The long hole bracket 51, the subframe 55, the slide member 58, the support bracket 60, the sliding guide bracket 65, and the like constitute a headrest driving mechanism 67 for supporting the headrest 13 so as to be tiltable in the front-rear direction. ing.

  In the headrest drive mechanism 67, the headrest body 14 and the support bracket 60 move upward when the slide member 58 moves obliquely upward and backward along the guide hole 50 (in the direction indicated by the arrow A in FIGS. 3 and 4). However, the positions of the contacts α, C1, and C2, the length of the arm portion 57 of the subframe 55, the angle θ2 (shown in FIG. 3) formed by the arm portion 57 and the support bracket 60, and the like are set so as to incline forward. Has been.

  The headrest drive mechanism 67 is for operating the headrest main body 14 when the following pressure receiving member 75 moves rearward. That is, the headrest driving mechanism 67 is configured so that when the pressure receiving member 75 moves rearward, the headrest body 14 tilts forward while the headrest body 14 moves upward as the slide member 58 moves along the guide hole 50. Has a function of driving.

  5 and 6 show details of the sliding guide bracket 65 and the sliding guide member 66. FIG. The sliding guide bracket 65 is made of metal and has a U-shape when viewed from above. The sliding guide bracket 65 is fixed to the upper frame member 32 by fixing means such as welding. A recess 69 is formed in the front wall 65 a of the sliding guide bracket 65.

  The sliding guide member 66 is an integrally molded product of synthetic resin, and includes a pressing portion 70 that is a protruding portion that protrudes toward the support bracket 60, a pair of left and right lateral restriction portions 71, and a stopper portion 72 that protrudes to the front side. It has. The sliding guide member 66 is inserted inside the sliding guide bracket 65, and the stopper portion 72 is fitted in the recess 69 of the sliding guide bracket 65 so that the vertical position of the sliding guide member 66 is determined. It has become.

  As shown in FIG. 6, the pressing portion 70 is in contact with the front surface of the support bracket 60 at the third contact C <b> 3. The pressing portion 70 has a spring property that can be bent in the front-rear direction (the direction indicated by the arrow F in FIG. 6), and has a function of urging the support bracket 60 toward the upper frame member 32. Yes.

  More specifically, as shown in FIG. 6, the pressing portion 70 supports the support bracket toward the intermediate position of the region S between the first contact C1 and the second contact C2 at the third contact C3. 60 is energized. That is, the line segment G through which the third contact point C3 passes is located between the line segment J through which the first contact point C1 passes and the line segment K through which the second contact point C2 passes. By doing so, when the support bracket 60 moves from the reference position P1 to the raised position P2, the change in the pressing position before and after the movement can be small, a stable pressing force can be obtained, and the stress change in the pressing portion 70 can be obtained. The design freedom can be increased. The angles β1 and β2 may be different from each other.

  Further, a portion (a portion including the first contact C1 and the second contact C2) where the support bracket 60 and the upper frame member 32 are in contact with each other is made of a material having a smaller friction coefficient than a metal (for example, a low friction synthetic resin). A coating layer 73 (shown by a one-dot chain line in FIG. 6) may be formed.

  The stage 15 of the headrest 13 is inserted into the support bracket 60 from the hole of the grommet 61. Each of the stages 15 is movable in the vertical direction with respect to the support bracket 60. The stage 15 is fixed to the support bracket 60 by a lock mechanism (not shown) in a state where the headrest body 14 is adjusted to a desired height.

  As shown in FIGS. 2 and 3, a pressure receiving member 75 is provided inside the seat back 12 so as to be located at the lower part of the spring assembly 21, that is, behind the waist of the occupant (seater). The pressure receiving member 75 is attached to the spring assembly 21. When the spring assembly 21 is pushed by the occupant and bent backward, the pressure receiving member 75 can move together with the spring assembly 21 from the front position toward the rear position. A convex portion 76 protruding rearward is formed on a part of the pressure receiving member 75.

  A speed increasing unit 79 is provided at a position facing the rear surface of the pressure receiving member 75. The speed increasing unit 79 includes a base bracket 80 fixed to the lower frame member 33, and a first arm 81 and a second arm 82 provided on the base bracket 80. The speed increasing unit 79 has a vertical orientation in which the first arm 81 is located on the upper side and the second arm 82 is located on the lower side, that is, the longitudinal direction of the base bracket 80 is the vertical direction. Is arranged on the lower frame member 33 in a posture along

  As shown in FIGS. 3 and 7, one end 43 a of each outer tube 43 of the pair of cables 41 and 42 is connected to the cable support 85 of the base bracket 80. One end 44 a of each wire 44 of the cables 41 and 42 is connected to the wire support portion 86 of the base bracket 80.

  One end (upper end) of the first arm 81 is rotatably supported by the base bracket 80 by a first pin 90. The base bracket 80 is provided with a guide pulley 91 that can rotate around the first pin 90.

  The first arm 81 and the second arm 82 are rotatably connected to each other by a second pin 92 so as to form a lateral V shape when viewed from the side. In other words, the first arm 81 and the second arm 82 constitute a <shaped link mechanism, and the first arm 81 and the second arm 82 protrude toward the pressure receiving member 75. The angle θ3 formed by the first arm 81 and the second arm 82 is preferably 90 ° or more (obtuse angle).

  A roller 95 is provided at a connection portion between the first arm 81 and the second arm 82. The roller 95 is an example of a contact member. The roller 95 is rotatable around the second pin 92. The roller 95 is disposed so as to face the convex portion 76 protruding from the rear surface of the pressure receiving member 75, and when the pressure receiving member 75 moves rearward (in the direction indicated by the arrow B in FIGS. 3 and 7), the convex portion 76 is provided. Is in contact with the roller 95.

  At the other end (lower end) of the second arm 82, a third pin 96 and a pulley 97 that is rotatable around the third pin 96 are provided. The third pin 96 is inserted into the guide hole 100 formed in the base bracket 80 and can move in the longitudinal direction of the guide hole 100 along the guide hole 100.

  The third pin 96 and the guide hole 100 constitute guide means. The guide means guides the movement of the pulley 97 so that the angle θ3 formed by the first and second arms 81 and 82 increases when the roller 95 is pushed rearward by the pressure receiving member 75.

  When the roller 95 is pushed in the direction of arrow B in FIG. 7 by the pressure receiving member 75, the angle θ3 formed by the first arm 81 and the second arm 82 increases. Here, since the first pin 90 is supported by the base bracket 80, the third pin 96 moves from one end (upper end) 100a of the guide hole 100 toward the other end (lower end) 100b. For this reason, the distance from the 1st pin 90 to the 3rd pin 96 becomes large gradually. That is, the pulley 97 moves downward along the guide hole 100.

  As shown in FIG. 7, the guide hole 100 has a first portion 101 located on the side closer to the first pin 90 and a second portion 102 located on the side far from the first pin 90. Yes. The first portion 101 extends obliquely downward and rearward at an angle θ4 with respect to an extension line L1 connecting the first pin 90 and the third pin 96. The second portion 102 is bent to the opposite side (obliquely lower front) to the first portion 101 with respect to the extension line L1.

  For this reason, when the pulley 97 moves along the guide hole 100 from the one end 100 a of the guide hole 100 toward the other end 100 b, the third pin 96 can easily move along the first portion 101. When the third pin 96 moves along the second portion 102, the moving speed of the pulley 97 is larger than when the first portion 101 is moved.

  As shown in FIG. 7, a part 44 c of each wire 44 of the pair of cables 41 and 42 is in contact with a part of the guide pulley 91. Around the pulley 97 located below, a portion 44d on the other end side of each wire 44 is wound about half a circumference. In other words, each end 44 a of the portion 44 d on the other end side of the wire 44 is fixed to the wire support portion 86 of the base bracket 80 in a state where the direction is changed by approximately 180 ° (U-turn) by the pulley 97.

  For this reason, when the pulley 97 moves along the guide hole 100 from one end 100a of the guide hole 100 toward the other end 100b, the pulley 97 moves downward like a moving pulley, so that each wire 44 is connected to the pulley 97. It is drawn by the length corresponding to the distance twice as much as the movement amount. In other words, when the pressure receiving member 75 moves rearward (in the direction of arrow B), the movement of the pressure receiving member 75 is increased by the speed increasing unit 79, and the wire 44 is pulled quickly.

  The other end 44 b (shown in FIG. 3) of each wire 44 of the pair of cables 41 and 42 is connected to each slide member 58 of the headrest drive mechanism 67. Therefore, when each wire 44 is pulled in the direction indicated by the arrow D in FIG. 3 by the speed increasing unit 79, each slide member 58 of the headrest drive mechanism 67 moves in the direction indicated by the arrow A.

Next, the operation of the vehicle seat 10 having the above configuration will be described.
When the occupant is pressed against the seat back 12 at the time of the collision, the pressure receiving member 75 is pushed backward by a load input to the seat back 12 from the vicinity of the occupant's waist. Accordingly, since the pressure receiving member 75 pushes the roller 95 of the speed increasing unit 79, the second arm is increased in the direction in which the angle θ3 (shown in FIG. 7) formed by the first arm 81 and the second arm 82 increases. 82 moves.

  At this time, when the third pin 96 moves downward along the guide hole 100, the pulley 97 moves downward. Since each wire 44 of the pair of cables 41 and 42 is wound around the pulley 97 in a U shape about half a circumference, the wire 44 is moved at a speed about twice the moving speed of the pulley 97 according to the principle of a so-called moving pulley. It is drawn in the direction indicated by arrow E in FIG. Therefore, each slide member 58 of the headrest drive mechanism 67 moves in the direction indicated by the arrow A in FIG.

  Since the first portion 101 of the guide hole 100 is inclined rearward at an angle θ4 with respect to the extension line L1 of the first and third pins 90 and 96, the roller 95 is pushed in the arrow B direction. First, the third pin 96 moves downward along the first portion 101 while moving slightly backward. For this reason, the wire 44 can be easily pulled out from the outer tube 43.

  Thereafter, since the third pin 96 moves along the second portion 102, the drawing speed of the wire 44 increases. Such a guide hole 100 allows the wire 44 to be pulled out by changing the inclination angle θ4 of the first portion 101 or changing the angle formed by the second portion 102 with respect to the first portion 101. The speed can be adjusted.

  By simultaneously pulling the wires 44 of the cables 41 and 42 by the speed increasing unit 79, the slide members 58 of the pair of left and right headrest drive mechanisms 67 are respectively obliquely upward and rearward along the guide holes 50 (FIG. 3). And a direction indicated by an arrow A in FIG.

  At this time, as the arm portion 57 of the subframe 55 moves upward and backward, the support bracket 60 rises and falls forward with the region S (shown in FIG. 6) between the contacts C1 and C2 as a fulcrum. Move to. Since the region S itself between the contact points C1 and C2 stays at the same position without moving forward, the headrest body 14 draws a trajectory as shown by an arrow M1 in FIG. 4 without accelerating the restraint under the occupant's neck. Move forward and upward. Thus, the head is quickly restrained by the headrest body 14 before the neck is restrained.

  In the present embodiment, since the sliding guide member 66 is provided on the sliding guide bracket 65, the support bracket 60 can smoothly move from the reference position toward the raised position when the headrest is operated. In addition, since the pressing portion 70 of the sliding guide member 66 urges the support bracket 60 toward the upper frame member 32, the slidability of the sliding portion can be ensured by absorbing variations in component dimensions. At the same time, it is possible to prevent rattling of the sliding portion.

  Further, since the lateral guide portion 71 is provided on the sliding guide member 66, the lateral swing when the support bracket 60 is actuated can be suppressed, and the support bracket 60 can be moved to the reference position when the headrest is actuated. It can move smoothly toward the ascending position. Therefore, the seat back 12 can suppress the occurrence of rattling in the sliding portion, is excellent in the operability of the headrest 13, and is effective in reducing the whiplash obstacle value.

  In the seat back 12 of the present embodiment, the backward movement of the pressure receiving member 75 is transmitted from the speed increasing unit 79 to the headrest driving mechanism 67 via the wires 44 of the pair of cables 41 and 42. Even if the distance from the speed unit 79 to the headrest driving mechanism 67 is large, the movement of the pressure receiving member 75 can be quickly transmitted to the headrest driving mechanism 67 by the wire 44.

  For this reason, even if the distance from the speed increasing unit 79 to the headrest drive mechanism 67 is relatively large, the entire apparatus including the pressure receiving member 75 and the headrest drive mechanism 67 can be configured to be lightweight. Further, it is easy to assemble the speed increasing unit 79 and the headrest drive mechanism 67 inside the seat back 12.

  Moreover, the vehicle seat 10 according to the present embodiment is configured to increase the moving speed of the pressure receiving member 75 at the time of the collision by the speed increasing unit 79 and operate the headrest driving mechanism 67 via the wire 44. Excellent and no delay in operation. Since the speed increasing unit 79 is configured independently from the pressure receiving member 75, the assembling property to the seat back frame 20 is good.

  8 and 9 show a sliding guide member 66 according to the second embodiment of the present invention. This sliding guide member 66 is also an integrally molded product of synthetic resin, and includes a pressing portion 70 having a spring portion 110, a pair of left and right lateral regulating portions 71, and a stopper portion 72. The sliding guide member 66 is inserted inside the sliding guide bracket 65, and the stopper portion 72 is fitted in the recess 69 of the sliding guide bracket 65 so that the vertical position of the sliding guide member 66 is determined. It has become. The pressing portion 70 is in contact with the front surface of the support bracket 60 and urges the support bracket 60 toward the upper frame member 32. The second embodiment configured as described above can also absorb the variation in component dimensions to ensure the sliding performance of the sliding portion, and can prevent the sliding portion from rattling. .

  10 and 11 show a sliding guide member 66 according to a third embodiment of the present invention. This sliding guide member 66 is also an integrally molded product of synthetic resin, and has a pressing portion 70 having spring properties, a pair of left and right lateral regulating portions 71, and a stopper portion 72. The sliding guide member 66 is inserted inside the sliding guide bracket 65, and the stopper portion 72 is fitted in the recess 69 of the sliding guide bracket 65 so that the vertical position of the sliding guide member 66 is determined. It has become. The pressing portion 70 is in contact with the front surface of the support bracket 60 and urges the support bracket 60 toward the upper frame member 32. The third embodiment configured as described above can also absorb the variation of the component dimensions to ensure the sliding performance of the sliding portion, and can prevent the sliding portion from being rattled. .

  12 and 13 show a sliding guide member 66 according to a fourth embodiment of the present invention. This sliding guide member 66 is provided with a pressing portion 70, a pair of left and right lateral restriction portions 71, and a stopper portion 72 by forming a single metal plate having spring properties. The sliding guide member 66 is inserted inside the sliding guide bracket 65, and the position in the vertical direction is determined by the stopper portion 72 coming into contact with the upper end surface of the sliding guide bracket 65. The pressing portion 70 having a spring property urges the support bracket 60 toward the upper frame member 32. If a sliding guide member 66 made of a thin leaf spring is used as in this embodiment, large dimensional variations can be absorbed.

  14 and 15 show a sliding guide bracket 120 according to a fifth embodiment of the present invention. The sliding guide bracket 120 is made of a single metal plate having a spring property, and is fixed to the upper frame member 32 by fixing parts 121 such as rivets or bolts. A pressing portion 122 protruding rearward is formed on the front wall of the sliding guide bracket 120. A pair of left and right lateral restriction portions 123 are formed on both sides of the sliding guide bracket 120. The lateral direction restricting portion 123 can contact the side surface of the support bracket 60. The pressing portion 122 urges the support bracket 60 toward the upper frame member 32.

  According to the fifth embodiment as described above, it is possible to secure the slidability of the sliding portion by absorbing the variation in the component dimensions, and to prevent the sliding portion from rattling. Moreover, it is possible to improve the assembly and reduce the number of parts.

  16 and 17 show a sliding guide member 130 according to a sixth embodiment of the present invention. The sliding guide member 130 is provided with a pressing portion 131 and a pair of left and right lateral regulating portions 132 by forming a single wire (metal wire) having spring properties. The pressing portion 131 and the lateral direction regulating portion 132 are respectively inserted into holes 133 formed in the sliding guide bracket 65. The pressing portion 131 urges the support bracket 60 toward the upper frame member 32. With such a sliding guide member 130, the structure is further simplified and the assemblability is improved.

  18 and 19 show a seventh embodiment of the present invention. In this embodiment, a coil spring 140 that functions as a pressing portion is attached to the sliding guide bracket 65. The coil spring 140 is inserted into a recess 69 formed in the sliding guide bracket 65. In addition, lateral regulating portions 141 made of convex portions are formed on the inner surfaces of both side walls of the sliding guide bracket 65.

  In the seventh embodiment, the coil spring 140 that functions as a pressing portion biases the support bracket 60 toward the upper frame member 32. For this reason, although it is a simple structure, it can absorb the dispersion | variation in component dimensions and can ensure the slidability of a sliding part, and can prevent generation | occurrence | production of the rattling of a sliding part. In addition, by providing the lateral restricting portion 141 on the side wall of the sliding guide bracket 65, the lateral shake when the support bracket 60 is actuated can be suppressed, and the headrest can be actuated smoothly.

The perspective view of the vehicle seat which shows the 1st Embodiment of this invention. The perspective view which shows the inside of the seat back of the vehicle seat shown by FIG. The side view which shows the inside of the seat back of the vehicle seat shown by FIG. The side view of the headrest drive mechanism of the vehicle seat shown in FIG. The perspective view which shows the sliding guide bracket and sliding guide member of the vehicle seat shown in FIG. FIG. 6 is a longitudinal sectional view of the sliding guide bracket and the sliding guide member shown in FIG. 5. The side view of the speed increasing unit of the vehicle seat shown in FIG. The perspective view of the sliding guide bracket and sliding guide member which show the 2nd Embodiment of this invention. Sectional drawing of the sliding guide member shown by FIG. The perspective view of the sliding guide bracket and sliding guide member which show the 3rd Embodiment of this invention. FIG. 11 is a longitudinal sectional view of the sliding guide member shown in FIG. 10. The perspective view of the sliding guide bracket and sliding guide member which show the 4th Embodiment of this invention. FIG. 13 is a plan view of the sliding guide bracket and the sliding guide member shown in FIG. 12. The perspective view of the sliding guide bracket and sliding guide member which show the 5th Embodiment of this invention. The top view of the sliding guide bracket and sliding guide member which were shown by FIG. The perspective view of the sliding guide bracket and sliding guide member which show the 6th Embodiment of this invention. The top view which shows the sliding guide bracket and sliding guide member which were shown by FIG. 16 in a partial cross section. The perspective view of the sliding guide bracket and sliding guide member which show the 7th Embodiment of this invention. The top view of the sliding guide bracket and sliding guide member which were shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 12 ... Seat back 13 ... Headrest 14 ... Headrest main body 15 ... Stay 20 ... Seat back frame 32 ... Upper frame member 60 ... Support bracket 65 ... Sliding guide bracket 66 ... Sliding guide member 67 ... Headrest drive mechanism DESCRIPTION OF SYMBOLS 70 ... Press part 71 ... Lateral direction control part 120 ... Sliding guide bracket 122 ... Press part 123 ... Lateral direction control part 130 ... Sliding guide member 131 ... Press part 132 ... Lateral direction control part 140 ... Coil spring (press part)
141 ... Lateral direction regulation part

Claims (8)

A seat back having a seat back frame;
A headrest body provided on an upper portion of the seat back, and a headrest having a stage extending below the headrest body;
A support bracket for inserting the headrest stage, a support bracket whose back surface abuts against an upper frame member of the seat back frame;
A sliding guide bracket provided on the seat back frame and supporting the support bracket so as to be movable in the vertical direction;
A pressure receiving member that is provided in the seat back and moves rearward when pressed by an occupant;
A headrest drive mechanism that drives the support bracket to tilt forward while moving from the reference position toward the raised position when the pressure receiving member moves rearward;
A pressing portion that is provided on the sliding guide bracket and biases the support bracket toward the upper frame member ;
The upper frame member has a first contact that contacts the support bracket when the support bracket is in the reference position, and a second contact that contacts the support bracket when the support bracket moves to the raised position. And
The pressing portion includes a convex portion having a spring property, and the convex portion comes into contact with the front surface of the support bracket at a third contact, whereby the support bracket is moved between the first and second contacts by the pressing portion. A vehicle seat that is biased toward an area . The first contact point is located above the second contact point, and the support bracket uses a region between the first and second contact points as a fulcrum when moving from the reference position to the raised position. The vehicle seat according to claim 1, wherein the vehicle seat is supported by the sliding guide bracket and the upper frame member so as to be tiltable in a front-rear direction .   The vehicle seat according to claim 1, wherein the sliding guide bracket is provided with a lateral restriction portion that can contact a side surface of the support bracket.   The vehicle seat according to claim 3, wherein the pressing portion and the lateral restriction portion are integrally formed of synthetic resin.   The vehicle seat according to claim 3, wherein the pressing portion and the lateral restriction portion are formed by forming a single metal plate having a spring property.   The vehicle seat according to claim 3, wherein the pressing portion and the lateral restriction portion are formed by forming a single metal wire having a spring property.   The vehicle seat according to claim 3, wherein the pressing portion is formed of a coil spring, and the lateral restricting portion is formed of a convex portion protruding from an inner surface of a side wall of the sliding guide bracket.   The vehicle seat according to claim 1, wherein a coating layer having a smaller coefficient of friction than metal is formed at a portion where the support bracket and the upper frame member are in contact with each other.

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