JP2009107519A - Movable type headrest device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a function of preventing a return of a headrest approaching and moving toward a head part in a vehicle rear collision. <P>SOLUTION: In this headrest 1, a movable side member 20 is connected to a base side member 10 to approach and move toward the head part. A slide pin 21B provided integrally with the movable side member 20 slides along a guide shape of a guide piece 15 formed in the base side member 10 according to a link motion of a link member 30. The guide piece 15 is provided with rigidity for guiding sliding and moving of the slide pin 21B, but the guide piece 15 is deformed by receiving pressing force from the slide pin 21B by backward inclination load of the head part inputted into the movable side member 20 when the vehicle rear collision occurs and allows movement of the slide pin 21B to enter a receiving groove 14B formed in the base side member 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a movable headrest device. More specifically, the present invention relates to a movable headrest device that moves a headrest of a headrest toward a seated person's head when a rear collision of the vehicle is detected.

2. Description of the Related Art Conventionally, there is a vehicle seat that employs a mechanism that promptly moves a headrest forward when a vehicle rear-end collision occurs to prevent a seated person's head from leaning backward. Here, Patent Document 1 below discloses a mechanism that prevents the headrest that has moved to the collision-corresponding position from returning. In this disclosure, tooth surfaces that can mesh with each other are formed between a movable portion that receives the head of the seated person and a link member that moves the movable portion forward. These tooth surfaces are normally spaced apart from each other, but the movable part receives the backward tilting load of the head and moves rearward to engage with each other to prevent the movable part from returning. ing.
JP 2007-106384 A

  However, in the prior art disclosed above, the headrest return prevention function may not work well if the teeth are not closely meshed with each other.

  The present invention has been devised as a solution to the above-described problems, and the problem to be solved by the present invention is to prevent the return of the headrest that moves close to the head during a rear-end collision. The goal is to improve.

In order to solve the above problems, the movable headrest device of the present invention takes the following means.
First, a first invention is a movable headrest device that moves a headrest close to a seated person's head when a vehicle rear-end collision is detected. The headrest has a configuration in which a movable side member that receives a seated person's head is connected to a base side member that is fixedly installed on the upper portion of the seat back so as to be able to move close to the head. The movable member is connected to the base member by a link mechanism and a slider mechanism. The former link mechanism links both members in a rotatable manner. The latter slider mechanism has a guide structure that slides the engaging protrusion formed on the one side member along the guide path formed on the other side member as the link mechanism moves. The other side member on which the guide path is formed accepts an engaging projection that slides along the guide path in a direction perpendicular to the sliding direction. A receiving groove is formed to prevent the movement in the reverse direction. The guide path has rigidity capable of guiding the sliding movement of the engaging protrusion. However, when a rearward collision of the vehicle occurs, the guide path is deformed by receiving a pressing force from the engagement protrusion due to the backward tilt load of the head input to the movable member, and allows the engagement protrusion to be received in the receiving groove. It has a configuration.

  According to the first aspect of the invention, the movable side member that receives the head of the seated person moves close to the head of the seated person with the link motion of the link mechanism when the rear collision of the vehicle occurs. Specifically, the proximity movement of the movable side member toward the head is performed along with the slide along the guide path of the engagement protrusion that constitutes the connection structure with the base side member. Normally, the slide of the engaging projection can be moved along the shape of the guide path by the rigidity of the guide path. However, the guide path is deformed by the pressing force received from the engaging protrusion when the rear collision of the vehicle occurs. As a result, the engaging protrusion is received in the receiving groove, and movement of returning to the direction opposite to the proximity movement direction toward the head of the movable side member is prevented. Thus, it is possible to improve the function of preventing the return of the headrest that has moved forward in the event of a vehicle rear-end collision.

Next, in a second aspect based on the first aspect described above, the base side member is formed by integral molding of synthetic resin. The guide path is formed integrally with the base side member by integral molding of the synthetic resin of the base side member.
According to the second aspect, since the guide path is formed in the base side member, the shape of the movable side member that is a moving body can be kept small. In addition, since the guide path is formed together by integral molding of the synthetic resin of the base side member, the number of functional parts that prevent the headrest from returning can be reduced and the configuration can be rationalized.

Next, according to a third aspect, in the first or second aspect described above, the guide path is broken by the pressing force received from the engaging protrusion when the rear collision of the vehicle occurs, and the engaging protrusion enters the receiving groove. It is configured to allow acceptance.
According to the third aspect of the invention, when the rear collision of the vehicle occurs, the guide path is pressed by the engaging protrusion and is broken, so that the engaging protrusion is stabilized inside the receiving groove without receiving a reaction force from the guide path. Accepted. Thereafter, the used state of the guide route can be easily understood as the state where the movement guidance by the guide route does not function.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings.

  First, the configuration of the movable headrest device according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the movable headrest device has a configuration capable of moving the headrest 1 close to the seated person's head when a rear collision of the vehicle is detected. Here, as shown in FIG. 2, the headrest 1 is configured so that the movable side member 20 that receives the head of the seated person faces the head with respect to the base side member 10 that is fixedly installed on the upper portion of the seat back 2. Are connected so as to be close to each other.

  The movable side member 20 is connected to the base side member 10 by forming link members 30 and 30 that link both members in a rotatable manner, and a slide pin 21B connected to the movable side member 20 in the base side member 10. And a guide structure that is slidably engaged along the shape of each guide piece 15, 15. Here, the slide pin 21B corresponds to the engagement protrusion of the present invention, and the guide pieces 15 and 15 correspond to the guide path of the present invention. The slide pin 21B is held in a state where the slide is regulated by the holding mechanism 50 at the lower end side position of the curved guide path formed by the guide pieces 15 and 15 at all times before the occurrence of the rear collision of the vehicle.

  The slide pin 21 </ b> B is provided with a tension spring 40 between the link members 30, 30 and the connecting shaft 32 that connects the base side member 10, and is always in the guide shape of the guide pieces 15, 15. It is made into the state urged to move along the upper left direction in the figure. The holding mechanism 50 that holds the slide pin 21B in the initial position releases the holding state of the slide pin 21B as the vehicle rear-end collision occurs. Therefore, when the rear pin collision occurs, the holding state of the slide pin 21B is released, and as shown in FIG. 4, the link members 30 and 30 are moved by the urging force of the tension spring 40 described above. Along with this, the guide pieces 15 and 15 slide in the upper left direction in the figure along the guide shape.

  As shown in FIG. 5, the slide pin 21 </ b> B is stopped from sliding when the link members 30, 30 interfere with the upper wall 13 of the base side member 10. Thereby, the movable side member 20 moves from the initial position in FIG. 2 to the upper left in the figure with respect to the base side member 10 to be in the state of the collision corresponding position close to the head. In a state where the movable side member 20 is moved to the collision corresponding position, each of the link members 30 and 30 is in a state of lowering to the right in the drawing and in contact with the upper wall 13 of the base side member 10.

  Thereby, even if the movable side member 20 receives the backward tilting load of the head at the time of the rearward collision of the vehicle, the direction in which the backward tilting load is further pressed against the upper wall 13 of the link members 30, 30. It is made to act on. That is, when the movable side member 20 has reached the collision-corresponding position, it does not return in the reverse direction even if it receives a backward tilting load on the head, and can receive the backward tilting load at that position. It has become.

  Further, as shown in FIG. 6, the movable side member 20 has the receiving groove 14 </ b> B formed in the base side member 10 with the slide pin 21 </ b> B even when a backward tilting load is applied from the head during the unfolding movement.・ ・ By making it accept, movement in the return direction can be prevented. Specifically, when a backward tilting load from the head is input to the movable side member 20, the slide pin 21B breaks the guide pieces 15 and 15 by the pressing force to enter the receiving grooves 14B. Get in.

  As a result, the slide pin 21B is stably received in the receiving groove 14B... Without receiving the reaction force accompanying the restoring deformation of the guide pieces 15 and 15. Therefore, even if the backward tilting of the head occurs in the middle of the movement of the movable side member 20, the backward tilting of the head is stopped early to prevent whipping. Can do. Hereinafter, the detail of each structural member of the headrest 1 mentioned above is demonstrated.

  First, the structure of the base side member 10 is demonstrated using FIG. The base side member 10 is formed by integral molding of synthetic resin, and the whole is constituted by one part. Specifically, the base side member 10 is formed into a frame shape by side walls 11 and 11 forming the edges of both sides, a bottom wall 12 forming the lower edge, and an upper wall 13 forming the upper edge. Has been. Holders 11 </ b> A and 11 </ b> A for inserting and fixing stays 1 </ b> S and 1 </ b> S serving as support columns of the headrest 1 are formed on the outer sides of the side walls 11 and 11. Then, four ribs 14... Arranged in the width direction are arranged and formed inside the frame of the base side member 10 so as to connect the upper wall 13 and the bottom wall 12.

  And the guide surface 14A ... curved along the guide shape of each guide piece 15 and 15 mentioned later is formed in the front part shown in the figure near side of these ribs 14 .... Then, at two positions on each guide surface 14A,..., Receiving grooves 14B that are recessed rearward with respect to the guide surface 14A are formed. And between the two ribs 14 and 14 on the right side of the drawing and between the two ribs 14 and 14 on the left side of the drawing, thin plate-shaped guide pieces 15 and 15 are respectively formed and formed. These guide pieces 15 and 15 are formed so as to connect the upper wall 13 and the bottom wall 12 in the same manner as the ribs 14.

  And the guide pieces 15 and 15 are formed in the curved shape along the shape of guide surface 14A ... which was mentioned above, as FIG. 2 shows. Thereby, as shown in FIGS. 4 to 5, the guide pieces 15 and 15 can move and guide the slide pin 21 </ b> B by its rigidity along the curved guide shape. However, as shown in FIG. 6, the guide pieces 15 and 15 are notched 15A and 15A when the slide pin 21B is pressed rearward by a backward tilting load of the head accompanying the rearward collision of the vehicle in the middle of the slide. Are broken at the break points.

  Thereby, since the movement guide by the guide pieces 15 and 15 does not function, the slide pin 21B moves backward and is received in the receiving groove 14B. Here, returning to FIG. 5, the guide pieces 15, 15 do not break even when the slide pin 21 </ b> B is moved to the collision-corresponding position, even if the guide pin 15 </ b> B receives the action of the pressing force accompanying the backward tilt of the head from the slide pin 21 </ b> B. It is like that. Specifically, the guide surface 14A ·· formed on the rib 14 ·· described above is arranged to be flush with the guide pieces 15 and 15 at the guide location where the slide pin 21B becomes the collision corresponding position. . Thereby, the pressing force of the slide pin 21B is received by each guide surface 14A.

  Next, returning to FIG. 2, the configuration of the holding mechanism 50 that holds the slide pin 21B in the initial position will be described. The holding mechanism 50 includes a hook 51 that can be hooked on the slide pin 21B, a pole 52 that locks and releases the movement of the hook 51, and an operation arm 53 (see FIG. 7) that operates the pole 52. Have. Here, the hook 51 is pivotally connected to the base-side member 10 by a connecting shaft 51A. The hook 51 is normally urged to rotate counterclockwise by a winding spring 51S hooked between the hook 51 and the base side member 10.

  As can be seen with reference to FIG. 4, the hook 51 configured as described above is in a state in which the lower jaw 51 </ b> C is exposed in the guide path by the urging force of the winding spring 51 </ b> S before being engaged with the slide pin 21 </ b> B. Is held in. Then, from this state, when the slide pin 21B slides to the lower end side position of the guide path, the lower jaw 51C is pressed by the slide pin 21B, and the hook 51 rotates in the clockwise direction in the figure. As a result, as shown in FIG. 2, the hook 51 has a posture in which the upper jaw 51B is wrapped behind the slide pin 21B and the slide pin 21B is sandwiched between the upper jaw 51B and the lower jaw 51C.

  As the hook 51 rotates, the pole 52 engages with the hook 51 by the biasing movement. Thereby, the rotation of the hook 51 is locked as the state where the hook 51 is hooked on the slide pin 21B. The rotation lock state of the hook 51 is released when the pole 52 is released from the engagement state with the hook 51. Thereby, the hook 51 is rotated counterclockwise in the figure by the urging force of the winding spring 51S, and the hook 51 is pushed out by the lower jaw 51C, and the hook 51 is released from the hooked state with the slide pin 21B.

  Next, the pole 52 is pivotally connected to the base side member 10 by a connecting shaft 52A. The pole 52 is normally urged to rotate in the clockwise direction of the drawing approaching the outer peripheral surface of the hook 51 by a winding spring 52S hooked between the pole 52 and the base side member 10. As can be seen with reference to FIG. 4, the pole 52 is held in a state of being pressed against the outer peripheral surface of the hook 51 by the urging force of the winding spring 52 </ b> S before the slide pin 21 </ b> B is engaged with the hook 51. ing.

  The pole 52 is positioned at a position over the corner 51D protruding from the outer peripheral surface of the hook 51 when the hook 51 is pressed by the slide pin 21B and rotated in the clockwise direction in the figure. It will be in the state where it struck by the urging force and was abutted on the back part of the. Accordingly, the pole 52 is in a state in which the biasing rotation of the hook 51 in the counterclockwise direction is restricted. The state in which the rotation of the hook 51 is locked by the pole 52 is released when the pole 52 is rotated counterclockwise by the operation arm 53 shown in FIG.

  Here, the operation arm 53 is provided outside the frame of the base side member 10 so as to be pivotally supported and connected to the side wall 11. Specifically, the operation arm 53 is integrally connected to a connecting shaft 52A that supports the above-described pole 52 (see FIG. 4). As a result, the operating arm 53 and the pole 52 are integrally connected to each other by the connecting shaft 52A so as to rotate integrally with each other. The operation of rotating the operation arm 53 in the counterclockwise direction shown in the drawing is performed by the drive unit 60 installed on the side wall 11 outside the frame.

  The drive unit 60 receives an electric motor 61 that receives and detects a rear collision detection signal, rotates an electric motor 61, receives a drive rotation of the electric motor 61, rotates a shaft, and receives power from the worm 62. A rotating worm wheel 63. Specifically, the electric motor 61 is not shown in the figure, but rotates the worm 62 directly connected to the drive shaft 61A by receiving a detection signal of occurrence of a rearward collision of the vehicle from a detection device provided on the vehicle body side. It is like that.

  A worm wheel 63 is connected to the worm 62 in a state where the tooth portions 62A and 63A are engaged with each other. As a result, the worm wheel 63 rotates in conjunction with the shaft rotation of the worm 62. The worm wheel 63 is integrally provided with a cam 63B having a protrusion on the outer periphery. As the worm wheel 63 rotates, the cam 63B presses the operation arm 53 by its projection shape and rotates it counterclockwise in the figure.

  Next, returning to FIG. 1, the configuration of the movable member 20 will be described. The movable member 20 includes a planar support plate 21 that supports the seated person's head from the rear side, and a box-shaped case 22 attached to the rear surface portion of the support plate 21. Each of the support plate 21 and the case 22 is formed by integral molding of synthetic resin, and is hinged to the upper end portion so that it can be opened and closed. Thereby, the case 22 is assembled in a state where the base side member 10 is enclosed between the case 22 and the support plate 21.

  Next, as shown in FIG. 2, the support plate 21 is integrally formed with a pair of left and right arm portions 21 </ b> A and 21 </ b> A extending rearward on the back surface portion. These arm portions 21 </ b> A and 21 </ b> A are arranged and formed in a pair on the left and right sides of the support plate 21 in the width direction. A slide pin 21B extending in the width direction is integrally connected to the rear end portions of the arm portions 21A and 21A so as to connect the rear end portions of the arm portions 21A and 21A. As shown in FIG. 3, the slide pin 21 </ b> B is assembled so as to be slidable along the guide shapes of the guide pieces 15, 15 across the ribs 14... Of the base side member 10 described above. ing.

  As shown in FIG. 4, the support plate 21 is connected to the base side member 10 by link members 30 and 30. These link members 30 and 30 are arranged in a pair of left and right side by side in the width direction, like the arm portions 21A and 21A described above. Each link member 30, 30 is pivotally connected to the support plate 21 by a connecting shaft 31 at the front end portion on the left side in the drawing. And the rear-end part of the right side of each link member 30 and the illustration is pivotally connected with the base side member 10 by the connection shaft 32 so that rotation is possible.

  As shown in FIG. 3, the connecting shaft 32 is provided in a state of being inserted through the ribs 14... Of the base side member 10 described above. As shown in FIG. 4, a tension spring 40 is hooked between the connecting shaft 32 and the slide pin 21B. As a result, the slide pin 21 </ b> B is constantly urged to move in the direction of being pulled toward the connecting shaft 32 by the urging force of the tension spring 40.

  Then, the usage method of a present Example is demonstrated. That is, as shown in FIG. 2, the headrest 1 is always held in the initial position in which the slide pin 21 </ b> B is held by the holding mechanism 50 before the occurrence of the rearward collision of the vehicle. In this state, when a vehicle rearward collision occurs, as shown in FIG. 7, the electric motor 61 is driven to rotate and the operation arm 53 is rotated in the counterclockwise direction shown in the figure. 4, the holding state of the slide pin 21B by the holding mechanism 50 is released, and the slide pin 21B is illustrated along the guide shapes of the guide pieces 15 and 15 by the urging force of the tension spring 40. Slide in the upper left direction.

  As the slide pin 21B slides, the movable side member 20 as the head receiving portion moves closer to the head. At this time, when the rearward tilt load of the head accompanying the rearward collision of the vehicle is input to the movable member 20 during the sliding movement of the slide pin 21B, the slide pin 21B is pressed backward with a strong force. Accordingly, as shown in FIG. 6, the guide pieces 15 and 15 are broken, and the slide pin 21B is received in the receiving groove 14B. Accordingly, since the movement that is pulled back below the slide pin 21B by this reception is stopped, the head of the seated person can be stably received at the position in the middle of the movement.

  In addition, as shown in FIG. 5, when the slide pin 21B moves to the collision corresponding position without receiving the backward tilting load of the head, the seated person's head is the movable member at the collision corresponding position. Then, the inclined load is stably received by 20. In this case, the slide pin 21B can be easily returned to the initial position against the urging force of the tension spring 40 while the slide pin 21B follows the guide shape of the guide pieces 15 and 15 after the rearward collision of the vehicle.

  Thus, according to the movable headrest device of the present embodiment, the guide pieces 15 and 15 for guiding the slide of the slide pin 21B are formed on the base side member 10, so that the movable side member 20 which is a moving body. The shape of can be kept small. Further, since the guide pieces 15 and 15 are formed together with the base side member 10 by integral molding of the synthetic resin of the base side member 10, the number of functional parts that prevent the headrest 1 from returning can be reduced. The configuration can be streamlined.

  Then, when the vehicle rear-end collision occurs, the guide pieces 15 and 15 are pressed by the slide pin 21B and are broken, so that the slide pin 21B does not receive the reaction force from the guide pieces 15 and 15 and enters the receiving groove 14B. Stablely accepted. After that, the used state of the guide pieces 15 and 15 can be easily understood as the state where the movement guide by the guide pieces 15 and 15 does not function.

  Then, the structure of the movable headrest apparatus of Example 2 is demonstrated using FIG. In the present embodiment, portions that exhibit substantially the same configuration and operation as the movable headrest device described in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different portions are described in detail. To do.

  In this embodiment, the guide pieces 16 and 16 for guiding the slide of the slide pin 21B are elastically bent and deformed by receiving a pressing force from the slide pin 21B due to the backward tilting load of the head, and thus the slide pin 21B. It is the structure which accept | permits the movement to the receiving groove 14B .... Therefore, each guide piece 16, 16 pushes the slide pin 21B out of the receiving groove 14B,. The shape is restored.

  The guide pieces 16 and 16 are also formed together with the base side member 10 by integral molding of the synthetic resin of the base side member 10 in the same manner as the guide pieces 15 and 15 shown in FIG. Yes. Thereby, unlike the configuration of the first embodiment, the guide pieces 16 and 16 can be made to repeatedly function even after being pressed and deformed once by the slide pin 21B.

Although the embodiment of the present invention has been described with reference to two examples, the present invention can be implemented in various forms in addition to the above-described example.
For example, although the link movement of the link members 30 and 30 for moving the movable side member 20 of the headrest 1 close to the head when the rear collision of the vehicle occurs is shown by the urging of the tension spring 40, the electric motor is shown. It may be performed by driving. That is, the link member performs link motion by receiving a driving force from an electric motor that rotates in response to a vehicle rear collision detection signal.

  Further, the link movement of the link member is directly received in response to the pulling operation force from the cable that is pulled when a vehicle rear-end collision occurs, using the technology disclosed in Japanese Patent Application Laid-Open No. 2005-104259. It may be operated to rotate. Specifically, when a rear collision of the vehicle occurs, this cable is pulled by receiving a backrest load applied to the seat back by the back of the seated person. Therefore, for example, the operation of rotating the operation arm 53 shown in FIG. 7 may be performed using a structure in which the cable is pulled when the rear collision of the vehicle occurs.

Further, the guide piece forming the guide path of the slide pin may be formed as a separate body from the base side member. However, in this case, the number of functional parts that prevent the headrest from returning increases. Moreover, the structure which formed the long hole which can slide a slide pin inside the guide piece may be sufficient as the guide path.
Moreover, the structure by which the guide path | route is formed in the movable side member and the engagement protrusion is formed in the base side member may be sufficient. However, in this case, it is necessary to secure a space for forming the guide path in the movable side member that is the moving body, and it is necessary to note that the shape on the moving body side is enlarged.

1 is an external perspective view of a headrest of Example 1. FIG. It is a side view showing typically the initial state of a headrest. It is a block diagram of a base side member. It is the side view which represented typically the middle state of the deployment movement of a headrest. It is the side view which represented typically the state where the headrest reached the collision corresponding position. It is a side view showing typically the state where the headrest was prevented from returning. It is a side view showing the arrangement state of a drive unit. 6 is a side view schematically showing a headrest return prevention structure of Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headrest 1S Stay 2 Seat back 10 Base side member 11 Side wall 11A Holder 12 Bottom wall 13 Upper wall 14 Rib 14A Guide surface 14B Receiving groove 15 Guide piece (guide path)
15A Notch 16 Guide piece 20 Movable member 21 Support plate 21A Arm part 21B Slide pin (engagement protrusion)
22 Case 30 Link member 31 Connection shaft 32 Connection shaft 40 Tension spring 50 Holding mechanism 51 Hook 51A Connection shaft 51B Upper jaw 51C Lower jaw 51D Corner 51S Winding spring 52 Pole 52A Connection shaft 52S Winding spring 53 Operating arm 60 Drive unit 61 Electric motor 61A Drive shaft 62 Worm 62A Tooth part 63 Worm wheel 63A Tooth part 63B Cam

Claims (3)

A movable headrest device that moves a headrest toward a seated person's head when a rear collision of the vehicle is detected,
The headrest has a structure in which a movable side member that receives a seated person's head is connected to a base side member that is fixedly installed on the upper part of the seat back so as to be able to move close to the head,
The movable side member is connected to the base side member by a link mechanism that links the two members so as to be rotatable relative to each other, and an engagement protrusion that is formed on one side member in association with the link movement of the link mechanism. And a slider mechanism having a guide structure that is slid along a guide path formed in the member on the side,
The member on the other side where the guide path is formed receives an engagement protrusion that slides along the guide path in a direction perpendicular to the slide direction, and a proximity movement direction toward the head of the engagement protrusion. Is formed with a receiving groove that prevents movement back in the opposite direction,
The guide path has rigidity capable of guiding the sliding movement of the engaging protrusion, but when a rearward collision of the vehicle occurs, a pressing force is applied from the engaging protrusion by a backward tilting load input to the movable side member. A movable headrest device, wherein the movable headrest device is configured to be received and deformed to allow the engagement protrusion to be received in the receiving groove. The movable headrest device according to claim 1,
The base side member is formed by integral molding of synthetic resin,
The movable headrest device, wherein the guide path is formed integrally with the base side member by integral molding of the synthetic resin of the base side member. The movable headrest device according to claim 1 or 2,
The movable headrest device, wherein the guide path is configured to be broken by a pressing force received from the engagement protrusion when a rear collision of the vehicle occurs and to accept the engagement protrusion into a receiving groove. .

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