JP5325455B2 - Active headrest headrest tilting device - Google Patents

Description

  The present invention relates to a headrest tilting device for an active headrest provided with a head protection function.

  There is known a headrest with a head protection function (hereinafter referred to as an active headrest) in which a headrest attached to an upper part of a seat moves forward to protect the head of an occupant from the rear when the vehicle collides.

  As the tilting device for the active headrest, for example, a wire driving unit is provided at the lower part of the seat back, a headrest driving unit is provided at the upper part of the seat back, and the wire moves when the occupant moves rearward relative to the seat back by a rear-end collision or the like. There is known a wire drive type in which the drive unit converts the pressure into wire tension, transmits the tension to the headrest drive unit, and tilts the headrest forward.

  Further, there is known a structure in which a pressure receiving plate is provided on the seat back and the headrest moves forward when the pressure receiving plate is rotated by the pressure of the occupant during the rear-end collision.

Further, the applicant has applied for an example in which a support bracket is movably provided in the holding portion as the headrest driving portion.
JP 2001-58533 A

  The headrest drive unit has a configuration in which a support bracket is incorporated in the holding unit, a headrest support is inserted into the support bracket, and a headrest stay is slidably assembled to the headrest support.

  Therefore, the number of parts is increased and the manufacturing cost is increased. In addition, many assembled parts between the holding portion and the stay are factors that cause rattling of the headrest. On the other hand, if the gap between the parts is set small in order to suppress rattling of the headrest, it is necessary to manufacture each part with high accuracy, resulting in a problem that the manufacturing cost increases and the assembling takes time.

  The present invention provides an active headrest that has a small number of parts, has a simple structure, is easy to assemble, has little headrest shakiness, and operates reliably to protect the occupant's head in the unlikely event. An object is to provide a headrest tilting device.

  In the present invention, the headrest tilting device for the active headrest is configured as follows.

A headrest drive unit provided at an upper part of a vehicle seat back and tiltably holding a headrest forward of the vehicle, a wire drive unit provided at a lower part of the seat back and driving a wire by pressure from an occupant, and the wire A tension transmission member that transmits the operation of the drive unit to the headrest drive unit,
The headrest drive unit includes a support bracket provided with a resin exterior body on an outer peripheral surface of a metal inner cylinder body, and a cylindrical body and a pair of left and right provided in parallel with each other. A holding portion that holds the upper and lower directions freely, a connecting member that attaches end portions to the left and right support brackets, and an operating portion that operates the support bracket in the vertical direction within the holding portion,
Further, the exterior body includes a guide portion protruding forward at the upper portion of the front surface, a flat portion formed flat at the lower portion of the front surface, and a rear cam portion protruding rearward at the upper portion of the rear surface. Prepared,
The holding portion corresponds to the guide portion at the upper end of the front wall, and when the support bracket moves upward from the holding portion, the guide portion moves forward. A lower protrusion protruding rearward corresponding to the flat portion at the lower portion of the wall and contacting the flat portion regardless of the position of the support bracket in the holding portion, and the rear cam at the upper portion of the rear wall The headrest tilting device is configured to include an upper protrusion protruding forward, which presses the rear cam portion forward when the support bracket moves upward from the holding portion.

2, in the F Ddoresuto tilting device, the inner surface of the inner cylindrical body, the slide holding portion for holding the stay of the headrest slidably, further comprising, at the top of the support bracket, desired to stay of the headrest It is assumed that a headrest support to be locked at a height of is assembled.

3, in the F Ddoresuto tilting device, the outer body, and that is formed integrally on the inner cylindrical member by injection molding.

4, in the F Ddoresuto tilting device, wherein the connecting member, was be made of resin.

  The headrest tilting device has the following effects.

  Since the support bracket is composed of the inner cylindrical body and the exterior body, the configuration is simplified, the number of parts can be reduced, and the assembly process can be simplified. The exterior body can be easily formed by injection molding or the like, and the manufacturing cost can be reduced.

  The headrest is securely held by the headrest tilting device, and the headrest does not rattle even while the vehicle is traveling. When the support bracket is operated upward, the support bracket is tilted forward by the cam mechanism provided between the support bracket and the head of the occupant is reliably protected.

An embodiment of a headrest tilting device according to the present invention will be described with reference to the drawings.
FIG. 9 shows a vehicle seat 100 including the headrest tilting device 2. The vehicle seat 100 includes a seat surface 102, a seat back 104, a headrest 3 attached to the upper portion of the seat back 104, and the like. The seat back 104 includes a seat back frame 106, a cushion material (not shown) is provided around the seat back frame 106, and an outer skin 101 is attached to the outer surface of the cushion material as indicated by a two-dot chain line.

  The seat back frame 106 has a shape that substantially conforms to the outer shape of the seat back 104, and includes a side frame 108, an upper frame 110, and a lower frame 112 provided on both the left and right sides. The upper frame 110 connects the left and right side frames 108 above the side frame 108, and the lower frame 112 connects the side frame 108 below the side frame 108.

  A headrest driving mechanism 4 as a headrest driving unit is attached to the front surface of the upper frame 110. A wire drive mechanism 6 as a wire drive unit is attached to the front surface of the lower frame 112. Between the headrest driving mechanism 4 and the wire driving mechanism 6, a wire 130 as a tension transmission member is provided and connected by the wire 130. The headrest 3 is attached to the headrest drive mechanism 4 by inserting a stay 5 from above. In addition, a spring member 120 is attached to the seat back frame 106 on the entire inside of the seat back frame 106.

  The wire 130 is a double structure composed of an outer cylinder and a metal strand wire (not shown) attached to the inside of the outer cylinder. By pulling a metal strand wire on the outer cylinder, the tension of the metal strand wire is increased. It is transmitted to the other end.

  The headrest drive mechanism 4 is shown in FIG. The headrest drive mechanism 4 includes a frame plate 30 serving as a base, holding portions 22 and 24 provided on the left and right sides of the frame plate 30, a support bracket 12 housed in each of the holding portions 22 and 24, and a frame plate 30. It is comprised from the operation | movement mechanism 50 etc. which were provided in the front surface of this as an operation part.

  The frame plate 30 is a metal plate, has a screw hole 62 in the upper part, and is fixed to the upper frame 110 using the screw hole 62 as shown in FIG. The holding portions 22 and 24 are rectangular cylinders, and are formed by fixing a substantially U-shaped member to the frame plate 30 by caulking or the like. If sufficient strength is secured, the entire frame plate 30 may be formed of resin.

  The holding part 22 and the holding part 24 are attached in parallel to each other and are formed symmetrically. Hereinafter, the holding unit 22 will be described, and the description of the holding unit 24 will be omitted.

  FIG. 2 shows a cross section of the holding portion 22. FIG. 2 is a longitudinal sectional view of the holding portion 22 with the support bracket 12 housed therein. The support bracket 12 is housed in the left and right holding portions 22 and 24, respectively. In the figure, 5 is a stay attached to the lower part of the headrest 3. As shown in the drawing, the holding portion 22 is formed with an upper protrusion 23 and a lower protrusion 25.

  The upper protrusion 23 is formed on the upper part of the rear wall 37 of the holding part 22, and the lower protrusion 25 is formed on the lower part of the front wall 39. The upper protrusion 23 is curved so as to slightly enter the inside of the holding portion 22 from the upper end edge of the holding portion 22. The lower protrusion 25 is formed so as to protrude from the front wall 39 into the holding portion 22.

  Further, as shown in FIG. 1, the upper portion of the front wall 39 is positioned below the upper end edges of the rear wall 37 and the left and right side walls 33, 35, etc. of the holding portion 22, and is an upper end edge 38 that is curved forward in an arc shape. Is formed.

  An engaging projection 17 is provided at the lower part of the holding part 22. The engagement protrusion 17 is cylindrical and is provided on the side wall 33. The engagement protrusion 17 protrudes inside the holding portion 22 and is engaged with an engagement groove 88 of the support bracket 12 described later.

  The support bracket 12 is shown in FIG. The support brackets 12 are basically formed to be the same on the left and right, and are connected by a connecting plate 20 as a connecting member.

  The support bracket 12 includes an inner cylindrical body 13 and an exterior body 15 fixed to the surface of the inner cylindrical body 13. The inner cylinder 13 is shown in FIG. The inner cylinder 13 is a cylindrical body as shown in the figure, and is formed in a square cross section as shown in FIG. FIG. 6 is a cross-sectional view of the support bracket 12 at a lower portion of an upper exterior body 80 described later.

  The inner cylinder 13 is formed, for example, by bending a metal flat plate (not shown) into a prismatic shape by pressing or the like, and butting the edges of the metal plate. Further, the inner cylindrical body 13 is formed by arranging the butted portion at the center of one side surface (front surface) of the inner cylindrical body 13. The inner cylinder 13 is not limited to this, and may be integrally formed with the exterior body 15 with a resin.

  The inner cylinder 13 is formed with a positioning notch 70 at the upper end, and two mounting holes 16 are provided on the upper side face to face each other. The positioning notch 70 is a notch for fixing the inner cylindrical body 13 at a predetermined position in a resin molding die. The attachment hole 16 is formed in a shape into which a fitting claw 97 of the headrest support 14 described later is fitted.

  An opening 72 is formed in the lower back surface of the inner cylinder 13, and a notch 74 is formed in the lower end. The opening 72 is a notch for assembling the connecting plate 20 to the support bracket 12. The opening 72 is formed so that a part of the connecting plate 20 enters the opening 72 when the connecting plate 20 is assembled to the support bracket 12.

  The notch 74 is a notch for aligning the direction of the inner cylinder 13 and is formed at a predetermined position with respect to the surface including the abutting portion where the metal flat plate is abutted during pressing. As a result, the inner cylinder 13 is housed in a fixed orientation in the resin molding die, and is formed such that the butt portion is always in front of the support bracket 12.

  The exterior body 15 is formed by injection molding from a resin material such as polypropylene. The exterior body 15 is formed of an upper exterior body 80 provided on the upper portion of the inner cylinder body 13 and a lower exterior body 82 provided on the lower portion, and is integrally fixed to the outer peripheral surface of the inner cylinder body 13. In addition, the material of the exterior body 15 and the shaping | molding method are not restricted to the said example.

  The upper exterior body 80 is provided with an overhang portion 83, a guide portion 9, a bead 84, and a rear cam 11. The overhang portion 83 is formed on the support bracket 12. The overhang part 83 is formed such that the lower part protrudes left and right, and the lower surface of the overhang part 83 is hooked on the upper edge of the holding part 22. Even if the support bracket 12 is housed in the holding portion 22, the overhang portion 83 has a slight gap with the holding portion 22, and when the support bracket 12 is strongly pressed down, It is hung on the upper edge.

  The guide portion 9 is provided on the front side surface of the support bracket 12. As shown in FIG. 2, the guide portion 9 is formed in a mountain shape protruding forward, and contacts the front wall 39 of the holding portion 22 when the support bracket 12 is stored in the holding portion 22.

  The rear cam 11 is provided on the rear side surface of the support bracket 12. As shown in FIG. 2, the rear cam 11 is formed so as to gradually spread outward from a portion slightly above the longitudinal center of the upper exterior body 80 to a lower portion of the upper exterior body 80. The bead 84 is provided in the center of the left and right side walls of the upper exterior body 80 along the vertical direction (longitudinal direction). When the support bracket 12 is housed in the holding portion 22, the bead 84 abuts against the inner surfaces of the side walls 33 and 35 of the holding portion 22 without a gap, and the support bracket 12 smoothly slides in the holding portion 22. And a width.

  Further, as shown in FIG. 6, a sliding holding portion 90 and a protrusion 95 (see FIG. 3) are provided inside the inner cylinder 13. The sliding holding portion 90 has a cylindrical inner surface, and is formed to have an inner diameter with which the stay 5 (see FIG. 2) of the headrest 3 is slidably fitted. Furthermore, in the sliding holding portion 90, groove portions 91 are formed at the four corners along the longitudinal direction of the inner cylindrical body 13. The groove portion 91 has an effect of preventing shrinkage deformation of the sliding holding portion 90 and reducing the amount of resin used.

  The protrusion 95 is continuously formed on the inner surface of the front and rear surfaces of the support bracket 12 from the upper end of the upper exterior body 80 to the sliding holding portion 90. The protrusion 95 is formed so that the resin extends beyond the upper end of the inner cylindrical body 13 and the upper exterior body 80. When the stay 5 is inserted into the support bracket 12, the protrusion 95 is formed at a height in contact with the outer surface of the stay 5. As a result, when the stay 5 is inserted into the support bracket 12, the stay 5 is supported by the protrusion 95 up to the upper end of the support bracket 12, and in particular, the headrest 3 is held with reduced backlash in the vehicle front-rear direction. .

  The lower exterior body 82 is formed below the upper exterior body 80 with a predetermined distance from the upper exterior body 80. The lower exterior body 82 includes a flat portion 85, an assembly portion 86, and an engagement groove 88. The lower exterior body 82 and the upper exterior body 80 are formed of the same resin, and a resin may be provided between the lower exterior body 82 and the upper exterior body 80 or may be separated without any resin.

  The flat portion 85 is provided on the front surface of the support bracket 12. The flat portion 85 is formed flat from the upper end to the lower end of the lower exterior body 82, and when the support bracket 12 is stored in the holding portion 22, the flat portion 85 contacts the lower protrusion 25 of the holding portion 22 without a gap.

  The assembly portion 86 is formed corresponding to the opening 72. As shown in FIG. 3, the insertion portion 46 of the connecting plate 20 can be inserted into the assembly portion 86 from the side. When the insertion portion 46 is inserted into the assembly portion 86, a part of the upper and lower surfaces of the insertion portion 46 enters the opening 72 and engages with the opening 72. In addition, a projection 89 protruding inside the support bracket 12 is formed on the inner side surface of the assembly portion 86.

  The engaging groove 88 is formed in the lower part of both side surfaces of the lower exterior body 82. The engaging groove 88 is formed in such a shape that the upper half is substantially parallel, has a width into which the above-described engaging protrusion 17 can enter, and the lower half continuously extends downward from the upper half. The upper half of the engagement groove 88 has a length in the longitudinal direction that does not contact the upper surface of the engagement protrusion 17 when the support bracket 12 is housed in the holding portion 22.

  The connecting plate 20 is shown in FIGS. FIG. 7 shows the front surface side of the connecting plate 20, and FIG. 8 shows the back surface side of the connecting plate 20. The connection plate 20 is a resin plate-like member, and is provided with a pair of connection holes 21 on the left and right sides and insertion portions 46 at both ends. The connection holes 21 are oval, and the connection pins 54 of the operating mechanism 50 are inserted therein.

  The insertion part 46 has a shape that can be inserted into the assembly part 86, and an engagement piece 47 is formed inside. The engagement piece 47 is formed by a groove 45 provided in a circumferential shape excluding the side on the center side in the longitudinal direction of the connecting plate 20, and can be bent in the front and back directions with an appropriate elastic force.

  A fitting hole 48 is formed in the center portion of the engaging piece 47. The fitting hole 48 is formed with a diameter that fits into the protrusion 89. Further, an inclined portion 49 is provided at the tip of the engagement piece 47 so that the thickness is gradually reduced. Further, as shown in FIG. 8, a groove 51 that is continuous with the inclined portion 49 is formed at the tip of the connecting plate 20. The groove 51 is formed to have a width through which the protrusion 89 passes.

  A headrest support 14 is attached to the upper portion of the support bracket 12. As shown in FIG. 1, the headrest support 14 includes a flat head 92 and a fixing portion 93 formed at the lower portion of the head 92. A through hole 94 is provided in the center of the headrest support 14 in the vertical direction. The through hole 94 is formed with an inner diameter into which the stay 5 of the headrest 3 can be easily inserted.

  The fixing portion 93 has a square cross section and is formed to be insertable into the support bracket 12. A slit 96 is provided at the center of the front and rear surfaces of the fixing portion 93. The slit 96 corresponds to the protrusion 95 formed inside the support bracket 12, and is formed so as not to interfere with the protrusion 95 when the headrest support 14 is inserted into the support bracket 12. Further, the fixing portion 93 is provided with a fitting claw 97. The fitting claw 97 is formed into a square shape by kerfs 98 provided in three directions except for the lower side, whereby the fitting claw 97 is formed so as to bend in and out of the fixing portion 93 with an appropriate elastic force. Yes.

  The headrest support 14 is fixed by fitting a fitting claw 97 into a mounting hole 16 formed in the side wall of the support bracket 12. And if the fitting nail | claw 97 is pushed inside the support bracket 12 and engagement is cancelled | released, it can remove from the support bracket 12. FIG.

  Further, at least one headrest support 14 is provided with an engagement button 99. The engagement button 99 is connected to an engagement piece (not shown) provided in the headrest support 14, and the engagement piece reduces the opening diameter of the through hole 94, that is, outwards. (Not shown). Thus, the headrest support 14 is engaged with the stepped portion 7 or the like (see FIG. 2) provided on the stay 5 of the headrest 3, and the headrest support 14 is held at an appropriate height of the seat back 104. The engagement button 99 is pressed to release the engagement of the engagement piece, and the height position can be changed.

  The operating mechanism 50 includes a pair of sector gears 52. One sector gear 52 is connected to one end of a metal stranded wire (not shown) of the wire 130, and the operating mechanism 50 and the wire driving mechanism 6 are connected via the wire 130. Each sector gear 52 is provided with a connecting pin 54, and the connecting pin 54 passes through the connecting hole 21 of the connecting plate 20.

  The wire drive mechanism 6 includes a link mechanism bent in a dogleg shape. When pressure is applied from the front of the vehicle, the bent portion of the link mechanism is pressed and deformed into a flat shape, and the wire 130 connected to one end of the link mechanism. Pull the metal stranded wire. In addition, the structure of the action | operation mechanism 50 is not restricted to the said structure.

  Next, the effect | action of the headrest tilting apparatus 2 mentioned above is demonstrated.

  In the headrest drive mechanism 4, the support bracket 12 is accommodated in the holding portions 22 and 24 as shown in FIG. 2. The headrest 3 is attached to the upper portion of the vehicle seat 100 by inserting the stay 5 into the support bracket 12. The support bracket 12 is always urged by the spring member 55 in the direction in which the support bracket 12 is accommodated in the holding portion 22.

  In such a state, the rear surface of the upper exterior body 80 contacts the rear wall 37 of the holding portion 22, the flat portion 85 of the lower exterior body 82 contacts the lower projection 25 of the front wall 39 of the holding portion 22, and the guide portion 9 is brought into contact with the upper inner side of the front wall 39 of the holding portion 22. Further, the bead 84 comes into contact with the inner surfaces of the side walls 33 and 35 of the holding portion 22, and the engagement groove 88 is fitted into the engagement protrusion 17.

  Accordingly, the support bracket 12 is held in the holding portion 22 without rattling in both the front-rear direction and the left-right direction. Therefore, the headrest 3 is securely fixed to the vehicle seat 100 and appropriately holds the head of the occupant during vehicle operation. Further, when the headrest 3 is pressed from above, the overhanging portion 83 comes into contact with the upper end of the holding portion 22 and the like so that the headrest 3 can be firmly held.

  Then, with the passenger seated on the vehicle seat 100, for example, when the vehicle collides, the passenger's back is pressed against the seat back 104. Then, the wire drive mechanism 6 is operated to pull the metal stranded wire of the wire 130, the sector gear 52 is rotated by the tension of the wire 130, the connecting pin 54 pushes up the connecting plate 20, and the connecting plate 20 is instantaneously moved upward. Let

  On the other hand, when the support bracket 12 is moved upward with respect to the holding portion 22 and the like by the operation mechanism 50, the combination of the rear cam 11 and the upper protrusion 23, and the flat portion 85 and the lower protrusion 25 of the lower exterior body 82. The support bracket 12 is tilted forward by the configured cam mechanism.

  That is, when the support bracket 12 moves slightly upward, the rear cam 11 contacts the upper protrusion 23 in a state where the lower protrusion 25 is in contact with the flat portion 85 of the support bracket 12. As a result, the support bracket 12 tilts forward of the vehicle. Since the rear cam 11 and the upper projection 23 and the flat portion 85 and the lower projection 25 are in contact with each other until the support bracket 12 is raised to the uppermost position, the support bracket 12 is continuously tilted forward. The When the support bracket 12 is raised to the uppermost position, the support bracket 12 is greatly inclined toward the front of the vehicle.

  When the head hits the headrest 3, the headrest 3 moves upward and is inclined forward, so that the headrest 3 can reliably support the head of the passenger. When the force on the support bracket 12 is removed, the support bracket 12 is immediately accommodated in the holding portion 22 by the spring member 55. Thereby, the headrest 3 is returned to the normal position.

  Further, when the headrest support 14 is damaged, the mounting bracket 16 is exposed from the holding portion 22 by slightly lifting the support bracket 12 from the holding portion 22 or the like, so that the fitting claw 97 is pressed and easily removed. It can be repaired or replaced with a new headrest support 14. Moreover, since the headrest support 14 is small, it can be manufactured at low cost.

  By performing resin injection molding on the inner cylinder 13, the exterior body 15, the sliding holding portion 90, and the like can be molded, and the support bracket 12 can be easily manufactured. Further, the support bracket 12 can be oriented and positioned in the mold by the notches 70 and 74, and the exterior body 15 and the like can be accurately resin-molded.

  The connecting plate 20 can be easily engaged by inserting the insertion portion 46 into the assembly portion 86, and the support bracket 12 can be easily connected. Further, since the connecting plate 20 is hung on the opening 72, it can be particularly firmly connected in the vertical direction. Since the stay 5 is held not by the headrest support 14 but by the sliding holding portion 90 and the protrusion 95, and in particular by the protrusion 95 provided in the front-rear direction, the headrest 3 is attached to the vehicle seat 100 in the front-rear and left-right directions. Both sides can be assembled with less rattling.

It is a perspective view which shows one Embodiment of the headrest drive mechanism concerning this invention. It is sectional drawing which shows a holding | maintenance part. It is a perspective view which shows a support bracket. It is a perspective view which shows an inner cylinder. It is a perspective view which shows a support bracket. It is sectional drawing which shows a support bracket. It is a perspective view which shows a connection board. It is a perspective view which shows a connecting plate from the back surface. It is a perspective view which shows the whole headrest tilting apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Headrest tilting device 3 ... Headrest 4 ... Headrest drive mechanism 5 ... Stay 6 ... Wire drive mechanism 9 ... Guide part 11 ... Rear side cam 12 ... Support bracket 13 ... Inner cylinder 14 ... Headrest support 15 ... Exterior body 16 ... Installation Hole 17 ... engaging protrusion 20 ... connecting plate 22.24 ... holding portion 38 ... upper edge 46 ... insertion portion 47 ... engaging piece 48 ... fitting hole 50 ... operating mechanism 70 ... notch 72 ... opening 74 ... Notch 80 ... Upper exterior body 82 ... Lower exterior body 84 ... Bead 86 ... Assembly part 88 ... Engaging groove 89 ... Projection 95 ... Projection 100 ... Vehicle seat

Claims (4)

A headrest driving unit provided at an upper part of the vehicle seat back and tiltably holding the headrest forward of the vehicle;
A wire driving unit provided at a lower portion of the seat back and driving a wire by pressure from an occupant;
A tension transmission member that transmits the operation of the wire drive unit to the headrest drive unit;
With
The headrest drive unit is
A support bracket provided with a resin outer body on the outer peripheral surface of the metal inner cylinder,
A cylindrical body, a pair of left and right, provided in parallel with each other, each holding the support bracket so as to freely enter and exit in the vertical direction;
A connecting member for attaching an end to each of the left and right support brackets;
An operating part for operating the support bracket in the vertical direction in the holding part;
With
Further, the exterior body includes a guide portion protruding forward at the upper portion of the front surface, a flat portion formed flat at the lower portion of the front surface, and a rear cam portion protruding rearward at the upper portion of the rear surface. Prepared,
The holding part corresponds to the guide part at the upper end of the front wall, and the guide part moves forward when the support bracket moves upward from the holding part.
A lower protrusion projecting rearward, corresponding to the flat part, in contact with the flat part regardless of the position of the support bracket in the holding part, on the lower part of the front wall;
An upper protrusion projecting forward is provided on the upper portion of the rear wall, corresponding to the rear cam portion, and pressing the rear cam portion forward when the support bracket moves upward from the holding portion. A headrest tilting device characterized by that. A slide holding portion that slidably holds the stay of the headrest is provided on the inner side surface of the inner cylinder,
The headrest tilting device according to claim 1, wherein a headrest support that locks the stay of the headrest at a desired position is attached to an upper portion of the support bracket.   The headrest tilting device according to claim 1, wherein the exterior body is formed integrally with the inner cylinder body by injection molding.   The headrest tilting device according to claim 1, wherein the connecting member is made of resin.

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