JP6432446B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. Specifically, the seat back connected in a state where the backrest angle can be changed with respect to the vehicle body, the armrest connected in a state in which the seat back can be unfolded and retracted by tilting rotation, and the deployment position of the armrest The present invention relates to a vehicle seat having an unfolded position holding mechanism for holding a change in angle with respect to a vehicle main body even if the backrest angle of the back is changed.

  2. Description of the Related Art Conventionally, in a vehicle seat, a configuration is known in which an armrest is connected to a seat back so that the armrest can be rotated up and down (Patent Document 1). The armrest is configured such that even if the backrest angle of the seat back is tilted rearward, the deployment restriction position can be changed as the seat back tilts so that the posture during deployment can be maintained in a horizontal state. ing. Specifically, the deployment position of the armrest is regulated by contact with a bending-extension link that is bridged between the seat back and a base that supports the seat back. The bending / extending link changes the bending / extending angle by moving the backrest angle of the seat back to change the restricting position where the armrest comes into contact.

Japanese Patent Laid-Open No. 10-166919

  However, in the above prior art, since the armrest is brought into contact with the bending / extending link having a predetermined bending / extending shape, the use load of the armrest is likely to be applied to the bending / extending link as a bending load, and the structure strength is weak. Yes. The present invention was devised to solve the above problems, and the problem to be solved by the present invention is a deployment position that suppresses a change in the deployment position of the armrest even if the backrest angle of the seat back is changed. The holding mechanism has a structure with high structural strength.

  In order to solve the above problems, the vehicle seat of the present invention takes the following means.

  The first invention is a state in which the seat back connected to the vehicle body in a state in which the backrest angle can be changed, and a state in which the seat can be unfolded and retracted by rotating up and down around a support shaft facing the seat width direction with respect to the seat back. And a deployment position holding mechanism that holds the deployment position of the armrest so that the change in the angle with respect to the vehicle body can be suppressed even if the backrest angle of the seat back is changed. The unfolding position holding mechanism has a bending / extension link mechanism that is pin-coupled between the vehicle main body and the armrest so as to bend and extend as the armrest moves up and down. The link of the flexure / extension link mechanism is rotated by changing the opening angle in one direction by the deployment of the armrest, and abuts each other by restricting the deployment position of the armrest and the flexure / extension link even if the seat back tilts backward By rotating the structural links of the mechanism in such a way as to change the opening angle of each other in the other direction, the armrest can be deployed to a position where the structural links of the bending and stretching link mechanism are brought into contact with each other. It can come closer.

  According to the first aspect of the present invention, the deployed position holding mechanism can be obtained by a simple configuration in which the bending / extending link mechanism in which the opening angle is regulated at a constant angle is provided between the armrest and the vehicle body. Nevertheless, the deployment position holding mechanism has a structure with high structural strength that can receive the applied load applied to the deployed armrest by always contacting the constituent links of the bending / extension link mechanism at fixed contact points. be able to.

  The second invention is the following configuration in the first invention described above. The bending / extension link mechanism is bent to the rear side of the armrest.

  According to the second aspect of the invention, the bending and stretching link mechanism can be configured to be compact and simple so that the bending and stretching movement can be performed in the region retracted from the front surface of the seat back to the rear side.

  The third invention is the following configuration in the second invention described above. The first connection point pin-connected to the vehicle body of the bending / extension link mechanism is at a position lower than the perpendicular bisector between the deployed position and the storage position of the second connection point pin-connected to the armrest of the bending / extension link mechanism. Is set.

  According to the third aspect of the invention, it is possible to prevent the bending / extension link mechanism from being held against the operation of retracting and retracting the armrest.

  The fourth invention is the following structure in the third invention described above. The seat back is configured to be tilted to a forward position where the seat back is tilted forward from an upright posture. The first connecting point of the bending / extending link mechanism is perpendicular to the retracted position of the second connecting point in the forward position of the seat back and the deployed position of the second connecting point in the backrest angle position before the forward movement of the seat back. It is set at a position lower than the branch line.

  According to the fourth aspect of the present invention, in the retracted state of the armrest, even if the seat back is tilted to the forward position, the bending / extension link mechanism can be prevented from being held.

1 is a perspective view illustrating a schematic configuration of a vehicle seat of Example 1. FIG. It is a side view showing typically the deployment state of an armrest. FIG. 3 is a side view showing a state in which the seat back is tilted backward from FIG. 2. It is a side view showing the state which accommodated the armrest from FIG. It is a side view showing the state where the seat back was moved forward. It is the schematic diagram showing the position of each point at the time of the armrest expansion | deployment corresponding to FIG. FIG. 7 is a schematic view showing a state in which the seat back is tilted backward integrally with the armrest from FIG. 6. It is the schematic diagram showing the state which correct | amended the position of the 2nd pin of an armrest from FIG. FIG. 9 is a schematic diagram illustrating a perpendicular bisector between the position of the second pin before tilting shown in FIG. 6 and the position of the second pin after correction shown in FIG. 8. FIG. 7 is a schematic diagram showing a perpendicular bisector between the position of the second pin before tilting backward shown in FIG. 6 and the position of the second pin when the seat back is tilted forward corresponding to FIG. 5.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the sheet 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the seat 1 of the present embodiment is configured as a rear seat (right seat) of an automobile. The seat 1 is configured as a so-called bench seat that is integrally provided with a central seat region 1B having a narrow lateral width between a left seat (not shown) in the same row. The seat 1 includes a seat back 2 that serves as a backrest for a seated person and a seat cushion 3 that serves as a seating portion.

  The seat back 2 described above is provided with an armrest 5 in the center seat area 1B that can be switched to a state where it can be used as an elbow rest when the person is not sitting in the area. The left and right side portions of the armrest 5 are axially coupled to the left and right side portions of the central seat region 1B of the seat back 2 so as to be rotatable by support shafts 5A facing the seat width direction. . As a result, the armrest 5 is connected to the center seat area 1B of the seat back 2 in a state where the armrest 5 can be unfolded and retracted by tilting up and down around the support shaft 5A.

  Specifically, the armrest 5 is fitted into a recessed position 2 </ b> A formed at the front position of the center seat area 1 </ b> B of the seat back 2 and the unfolded position where the armrest 5 is tilted to the front side of the seat back 2 to a substantially horizontal angle. It is designed to be rotated up and down between the storage position raised up to the tilted angle. Each operation of unfolding and storing the armrest 5 is performed by a user holding the armrest 5 by hand and pulling it forward or pushing it backward. The up-and-down rotation between the deployed position and the retracted position of the armrest 5 is performed over an angle range of 90 degrees or more in a state where the seat back 2 is normally used at a back leaning angle. It has become.

  As shown in FIG. 2, the armrest 5 is deployed on the front side of the seat back 2, so that the armrest 5 is substantially horizontal by a later-described deployment position holding mechanism 10 provided between the rear end portion of the seat cushion 3. The movement is stopped when it is pushed down to the angular position. As shown in FIGS. 2 to 3, the deployed position holding mechanism 10 always keeps the armrest 5 even when the backrest angle is adjusted back and forth within a tilted angle region where the seat back 2 is used as a backrest. When the seatback 2 is tilted forward to a substantially horizontal angle, the movement in the unfolding direction is held in a restricted state. In other words, the deployed position holding mechanism 10 is configured to always operate so that the deployed position of the armrest 5 can be held at a substantially horizontal angular position in accordance with the movement in which the backrest angle of the seat back 2 is adjusted. .

  Hereinafter, the specific configuration of the above-described deployment position holding mechanism 10 will be described in detail together with the basic configuration of the seat 1. First, the basic configuration of the seat 1 will be described. As shown in FIG. 1, in the seat 1 described above, the lower end portion of the seat back 2 described above has a backrest angle with respect to the rear end portion of the seat cushion 3 provided on the floor F via a recliner 4A. It is the structure connected in the state which can be adjusted. Here, the floor F corresponds to the “vehicle main body” of the present invention.

  Specifically, in the seat back 2 described above, the back frame 2B constituting the skeleton of the body frame 2B1 forming the skeleton of the right seat region 1A of the seat back 2 and the central seat region 1B of the seat back 2 The frame is divided into two subframes 2B2 forming a skeleton. The main body frame 2B1 and the subframe 2B2 are each configured in an inverted U-shape, and are usually mutually locked by a locking device 2C provided between shoulder portions on adjacent sides. It is in a state of being integrally connected.

  The back frame 2B is a cushion frame 3B that forms a skeleton of the seat cushion 3 via a recliner 4A that functions as a rotation shaft device in which the lower ends of the left and right side frames of the main body frame 2B1 can respectively be prevented from rotating. It is made into the state connected with the hinge by the rear-end part. Further, the back frame 2B is hingedly connected to the rear end portion of the cushion frame 3B via the shaft pins 4B facing the seat width direction at the lower end portions of the left and right side frames of the sub frame 2B2. It is supposed to be in a state. The recliner 4 </ b> A and the shaft pin 4 </ b> B are arranged in such a manner that the axes that are the rotation centers of the recliner 4 </ b> A are aligned at positions on the coaxial line. Due to the hinge connection between the recliner 4A and the shaft pin 4B, the main body frame 2B1 and the subframe 2B2 can be rotated together so that the backrest angle is changed in the front-rear direction integrally with each other around the same axis. It is like that.

  The main body frame 2B1 and the subframe 2B2 are integrally connected to each other by the locking device 2C, so that the recliner 4A is locked and the backrest angle of the main body frame 2B1 is fixed. The backrest angle of the frame 2B2 is also fixed together. However, even if the back frame 2B2 is in a state in which the backrest angle of the main body frame 2B1 is fixed by releasing the locking device 2C described above and being disconnected from the integral connection state with the main body frame 2B1, The main body frame 2B1 is left alone, and it can be tilted forward to the forward position shown in FIG. 4 around the shaft pin 4B alone.

  As shown in FIG. 1, the above-described armrest 5 is provided in a state where the left and right side portions are hingedly connected to each other by the support shaft 5 </ b> A with respect to the subframe 2 </ b> B <b> 2 having the above configuration. Specifically, the armrest 5 is sandwiched between a pair of left and right support brackets 2D extending in a substantially L shape from the middle in the height direction of the side frames on the left and right sides of the subframe 2B2. The left and right sides are hingedly connected to the front end of each support bracket 2D by the support shaft 5A.

  By the above connection, the armrest 5 can be rotated upside down with respect to the subframe 2B2 around the support shaft 5A. The rearward rotation of the armrest 5 is stopped at a position (storage position) where the armrest 5 is fitted into the recess 2A of the seat back 2 and locked. On the other hand, the forward rotation of the armrest 5 is caused by a pair of left and right deployed position holding mechanisms 10 provided between the left and right side portions of the armrest 5 and the extension bracket 3C coupled to the rear end portion of the cushion frame 3B. By the holding operation, the armrest 5 is stopped at a position (deployment position) where the armrest 5 is pushed down to a substantially horizontal angle.

  Next, a specific configuration of the deployment position holding mechanism 10 will be described. In addition, since the unfolding position holding mechanism 10 has a symmetrical configuration that is provided in a pair of left and right, the configuration inside the vehicle shown on the right side as viewed in FIG. I decided to. As shown in FIG. 2, the deployed position holding mechanism 10 is configured by a bending / extension link mechanism 10 </ b> A that is pin-connected between the extension bracket 3 </ b> C and the armrest 5 so as to bend / extend as the armrest 5 rotates. Yes.

  The bending / extending link mechanism 10A includes a first link 11 rotatably connected to the extension bracket 3C by a first pin 11A, and a second link rotatably connected to the armrest 5 by a second pin 12A. A link 12 and a third pin 13 that pin-couples the first link 11 and the second link 12 to each other so as to be rotatable are configured. Here, each of the first link 11 and the second link 12 corresponds to a “configuration link” of the present invention, the first pin 11A corresponds to a “first connection point” of the present invention, and the second link The pin 12A corresponds to the “second connection point” of the present invention.

  Specifically, the first link 11 described above is formed by a single plate-like member extending in a long shape in the height direction, and a first pin whose one end on the lower end side in the drawing faces the sheet width direction. The pin 11 is rotatably connected to the tip of the extension bracket 3C by 11A. The first pin 11 </ b> A is disposed at a position separated rearward and downward with respect to the shaft pin 4 </ b> B that is the tilt center of the backrest angle of the seat back 2.

  The second link 12 is formed by a single plate-like member that extends in the front-rear direction shorter than the first link 11 described above, and a second end of the second link 12 that is the front end side in the drawing faces the sheet width direction. A pin 12A is rotatably connected to the side of the armrest 5 by a pin 12A. The second pin 12 </ b> A is provided at a position spaced radially outward from the support shaft 5 </ b> A that is the rotation center of the armrest 5. Specifically, as shown in FIGS. 2 and 4, the second pin 12 </ b> A is a neck associated with the armrest 5 rotating up and down in an angle range of 90 degrees or more between the deployed position and the retracted position described above. Due to the swinging motion, the angle region between the position just behind the support shaft 5A in the height direction (see FIG. 2) and the position descending to the front lower side of the support shaft 5A (see FIG. 4) is moved to the position. Has been placed.

  As shown in FIG. 2, the third pin 13 is configured as an axis that faces in the sheet width direction, and the other end, which is the upper end side of the first link 11 shown in FIG. The other end, which is the end side, is connected to each other so as to be rotatable.

  Here, the shaft pin 4 </ b> B that is the rotation center of the seat back 2 described above is disposed at a substantially central position in the front-rear direction at the lower end portion of the seat back 2. Further, the support shaft 5A that is the rotation center of the armrest 5 is disposed at a position above the shaft pin 4B that is the rotation center of the seat back 2 described above. As shown in FIG. 4, the support shaft 5 </ b> A is arranged at a lower end portion of the armrest 5 in the retracted state and at a substantially central position in the front-rear direction with respect to the armrest 5.

  As shown in FIGS. 2 and 4, the bending / extending link mechanism 10 </ b> A having the above-described configuration is a movement in which the armrest 5 is rotated upside down between the deployed position shown in FIG. 2 and the retracted position shown in FIG. Along with this, the bending and stretching motion is performed in such a manner that the opening angle θ between the first link 11 and the second link 12 described above is changed. Specifically, the bending / extension link mechanism 10A is configured so that the second link 12 and the armrest 5 are moved together with the rotation of the armrest 5 between the deployed position (see FIG. 2) and the retracted position (see FIG. 4). The second pin 12 </ b> A that is the connection point of the armrest 5 rotates and moves across a line segment C that connects the support shaft 5 </ b> A that is the rotation center of the armrest 5 and the first pin 11 </ b> A that is the rotation center of the first link 11. It is like that.

  The bending / extension / linkage mechanism 10A is configured to rotate in such a region, so that when the second pin 12A rotates toward the line segment C due to the up-and-down rotation of the armrest 5, the first link 12A The link 11 and the second link 12 are bent so as to narrow the opening angle θ. Further, the bending / extension link mechanism 10 </ b> A has an opening angle between the first link 11 and the second link 12 when the second pin 12 </ b> A is rotated away from the line segment C by the up-and-down rotation of the armrest 5. It is designed to stretch so as to expand θ.

  Then, as shown in FIG. 2, the bending / extension / linkage mechanism 10A is configured so that the second pin 12A described above greatly exceeds the line segment C upward due to the rotation of the armrest 5 to the deployed position. The opening angle θ between the second link 12 and the second link 12 is greatly widened, and the stopper piece 12B formed on the second link 12 hits the corner portion 11B formed on the first link 11 to open each other. Rotation is regulated. As a result, the first link 11 and the second link 12 cannot be further opened and rotated, and the armrest 5 is held in the collapsed position.

  The stopper piece 12B formed on the second link 12 described above extends in the rotational direction from the side of the other end of the second link 12 near the third pin 13 and is bent perpendicularly to the axial direction. It is formed into a shape. Further, the corner portion 11B formed on the first link 11 is formed in a shape extending in the link length direction from the distal end portion on the other end side near the third pin 13 of the first link 11. Yes. The contact surface 11B1 that contacts the stopper piece 12B of the corner portion 11B described above is formed as a rising surface that rises in the link length direction of the first link 11. Specifically, the contact surface 11B1 of the corner portion 11B has a shape that rises so as to come into surface contact with the side surface of the stopper piece 12B formed on the second link 12 that faces the rotation direction.

  The first link 11 and the second link 12 are configured such that the rotation of each other is restricted by the stopper piece 12B hitting the corner portion 11B described above, and the corner portion 11B constituting the stopper structure of each other. The stopper piece 12B is configured to restrict the rotation by always contacting the same surface. As a result, the first link 11 and the second link 12 are configured to be rotationally regulated with high precision and high strength at a predetermined opening angle.

  In the state where the backrest angle of the seat back 2 is fixed at an arbitrary angle position, the bending / extension link mechanism 10A described above can always hold the armrest 5 that has been deployed to a constant deployment position. It has become. However, as shown in FIG. 3, the bending / extension link mechanism 10 </ b> A allows the support shaft 5 </ b> A, which is the rotation center of the armrest 5, to move together with the seat back 2 by adjusting the backrest angle of the seat back 2 to the rear side. As a result, the armrest 5 is pushed and moved so as to tilt backward about the shaft pin 4B, which is the center of rotation, and the holding state of the armrest 5 at the deployed position is destroyed.

  However, the bending / extension link mechanism 10 </ b> A has a second pin 12 </ b> A that is a connection point with the armrest 5 by a movement in which the support shaft 5 </ b> A of the armrest 5 tilts backward around the shaft pin 4 </ b> B that is the rotation center of the seatback 2. Is moved rearward so as to narrow the opening angle θ. As a result, the bending / extension link mechanism 10A can prevent the corner portion 11B and the stopper from moving even when the second pin 12A, which is the connection point with the armrest 5, is pushed backward and the opening angle θ is narrowed as described above. Up to the opening angle with which the piece 12B comes into contact, the opening angle θ can be opened and rotated by the amount narrowed.

  Therefore, by tilting the armrest 5 in the deploying direction so as to widen the bending / extension link mechanism 10A to the position where the opening angle θ is regulated at the position where the seatback 2 is tilted to the rear side, the armrest 5 is moved to the seatback 2. Can be tilted to a substantially horizontal angular position that is substantially the same as the unfolded state before it is tilted rearward. The reason is that the first pin 11A, which is a connection point with the extension bracket 3C of the bending / extension link mechanism 10A, is connected to the armrest 5 in a state where the opening angle θ of the bending / extension link mechanism 10A is regulated. A four-joint link formed by virtually connecting the second pin 12A, the shaft pin 4B that is the rotation center of the seat back 2, and the support shaft 5A that is the rotation center of the armrest 5 is a link close to a parallel link This is because the mechanism is configured.

  Specifically, the first pin 11A, which is a connection point between the bending / extension link mechanism 10A and the extension bracket 3C, rotates the seat back 2 in a state where the opening angle θ of the bending / extension link mechanism 10A is regulated by the deployment of the armrest 5. It is set to the rear side and a slightly lower position with respect to the shaft pin 4B which is the center. The second pin 12A, which is a connection point with the armrest 5 of the bending / extension link mechanism 10A, is the rotation center of the armrest 5 in a state where the opening angle θ of the bending / extension link mechanism 10A is regulated by the deployment of the armrest 5. It is set at a position directly behind the support shaft 5A in the height direction. The length of the line segment that connects the first pin 11A and the shaft pin 4B is substantially the same as the length of the line segment that connects the second pin 12A and the support shaft 5A. The length of the line segment connecting the second pin 12A is slightly longer than the length of the line segment connecting the shaft pin 4B and the support shaft 5A.

  By configuring the four-bar link as a link mechanism close to such a parallel link, the position of the support shaft 5A and the second pin 12A, which are the rotation centers of the armrest 5, by adjusting the backrest angle of the seat back 2 Is moved, the inclination of the line segment connecting the support shaft 5A and the second pin 12A with respect to the seat cushion 3 is always kept substantially constant. Therefore, regardless of the position at which the backrest angle of the seat back 2 is adjusted, the deployment position of the armrest 5 can always be held at a substantially constant and substantially horizontal angular position.

  In the state where the armrest 5 is retracted as shown in FIG. 4, the bending / extension link mechanism 10 </ b> A has a state in which the opening angle θ between the first link 11 and the second link 12 is narrower than the restriction angle. It has come to be. The bending / extending link mechanism 10A is moved forward from the state in which the armrest 5 is stored to the position where the seat back 2 is folded into the upper surface portion of the seat cushion 3 as shown in FIG. The rotation is performed so that the opening angle θ between the first link 11 and the second link 12 is increased. However, even when the seat back 2 is tilted to the forward position, the bending / extending / linkage mechanism 10A is not expanded until the opening angle θ is restricted, and the forward movement of the seat back 2 is prevented. ing.

  As described above, within the adjustment range of the backrest angle of the seat back 2, the bending / extension link mechanism 10A is opened to a state where the angle θ is restricted, while the bending / extension link mechanism 10A is opened when the seat back 2 is tilted forward. In order to prevent the angle θ from being expanded until it is restricted, the position of the first pin 11A of the bending / extending link mechanism 10A is set to the following position. First, as shown in FIG. 6, a state (state S1) in which the armrest 5 is deployed at a substantially horizontal angular position in a state where the seat back 2 is at an arbitrary backrest angular position will be considered. In this state S1, the positions of the support shaft 5A and the second pin 12A are arbitrarily determined on the armrest 5.

  Next, from this state S1, as shown in FIG. 7, the seat back 2 is tilted backward around the shaft pin 4B together with the armrest 5. As shown in FIG. However, when tilted backward in this manner, the armrest 5 is inclined upward due to the backward tilt of the seat back 2. Therefore, next, as shown in FIG. 8, the armrest 5 is corrected from the above state to a state where the armrest 5 is tilted to a substantially horizontal angle around the support shaft 5A (state S2).

  When the seat back 2 is tilted backward as described above, the second link 12A is moved from the state S1 (see FIG. 6) to the state S2 (see FIG. 8). The position of the first pin 11A (see FIG. 2) must be set. Therefore, next, as shown in FIG. 9, a perpendicular bisector L1 between the position of the second pin 12A in the state S1 and the position of the second pin 12A in the state S2 is taken. The position of the first pin 11A of the bending / extending link mechanism 10A described above is set at a position on the vertical bisector L1.

  Next, as shown in FIG. 10, the position of the second pin 12A in the state S1 and the state in which the armrest 5 is retracted from the state S1 (state S3) and the seat back 2 is brought down to the forward position ( A perpendicular bisector L2 is taken with the position of the second pin 12A in the state S4). The position of the first pin 11A of the bending / extending link mechanism 10A is set in a region below the vertical bisector L2. By doing so, even if the seat back 2 is tilted to the forward position, the bending / extension link mechanism 10A can follow and rotate in a form that cannot be used without being expanded to a state where the opening angle θ is restricted.

  Here, as shown in FIGS. 1 and 4, the armrest 5 described above is provided with support brackets that support the armrest 5 when the armrest 5 is retracted at the left and right edges of the front surface side in the retracted state. A covering extension 5B is formed so as to cover the inner structure of 2D and the like from the front side so as to cover the left and right sides. However, since the covering extensions 5B are formed on the armrest 5 as described above, the armrest 5 is brought into the unfolded state as shown in FIGS. It moves so as to enter the lower side of the bracket 2D, and enters into the installation area of each of the above-described bending-extension link mechanisms 10A.

  However, since each of the bending and stretching link mechanisms 10A has a retraction shape in which the shape formed by the first link 11 and the second link 12 is bent rearwardly into a “>” shape as described above, the armrest 5 Even if each covering extension portion 5B enters from the front side, the covering extension portions 5B can be received in a retracted form without interfering with each covering extension portion 5B. .

  In summary, the sheet 1 of the present embodiment has the following configuration. That is, the seat back 2 connected in a state where the backrest angle can be changed with respect to the floor F (vehicle main body), and the unfolded and retracted by rotating around the support shaft 5A facing the seat width direction with respect to the seat back 2 An armrest 5 connected in a state where the armrest 5 can be operated, and a deployment position holding mechanism 10 that holds the deployment position of the armrest 5 so that the change in the angle with respect to the floor F can be suppressed even if the backrest angle of the seat back 2 is changed. Sheet 1.

  The unfolded position holding mechanism 10 has a bending / extending / linking mechanism 10 </ b> A that is pin-connected between the floor F and the armrest 5 so as to bend / extend as the armrest 5 moves up and down. The first link 11 and the second link 12 constituting the bending / extension link mechanism 10A by rotating the armrest 5 rotate in such a manner as to widen (change in one direction) the mutual opening angle θ and contact each other. 5 is regulated, and the first link 11 and the second link 12 of the bending / extension link mechanism 10A narrow the mutual opening angle θ (change in the other direction) even if the seat back 2 tilts backward. , The armrest 5 can be expanded to a position where the first link 11 and the second link 12 of the bending / extension link mechanism 10A are brought into contact with each other, so that the armrest 5 can be brought closer to the expansion angle before the rearward tilt. Yes.

  By having such a configuration, the deployment position holding mechanism 10 is obtained by a simple configuration in which a bending / extension link mechanism 10A in which the opening angle θ is regulated at a constant angle is connected between the armrest 5 and the floor F. Can do. Nevertheless, the unfolded position holding mechanism 10 is made to contact the first link 11 and the second link 12 of the bending / extension link mechanism 10A with each other at a constant contact position. It can be set as the structure with high structural strength which can be received.

  The bending / extending link mechanism 10 </ b> A is bent to the rear side of the armrest 5. With such a configuration, the bending / extending link mechanism 10A can be configured to be compact and simple in which the bending / extending motion can be performed in the region retracted from the front surface of the seat back 2 to the rear side.

  Further, as shown in FIG. 10, the first pin 11A (first connection point) pin-connected to the floor F of the bending / extension link mechanism 10A is second connected to the armrest 5 of the bending / extension link mechanism 10A. A position lower than the vertical bisector L3 between the unfolded position (the position of the second pin 12A in the state S1) and the retracted position (the position of the second pin 12A in the state S3) of the pin 12A (second connection point) Is set to With such a configuration, even when the armrest 5 is rotated between the deployed position and the retracted position, the bending / extension link mechanism 10A is rotated so as not to be held without being expanded to a state where the opening angle θ is regulated. Can be made.

  Further, the seat back 2 is configured to be tilted to a forwardly tilted position that tilts forward from an upright posture. The first pin 11A of the bending / extending link mechanism 10A is a second pin in the retracted position (the position in the state S4) of the second pin 12A in the forward tilt position of the seat back 2 and the backrest angle position of the seat back 2 before the forward tilt. It is set at a position lower than the vertical bisector L2 with respect to the development position 12A (position in the state S1). With such a configuration, in the retracted state of the armrest 5, even if the seat back 2 is tilted to the forward position, the bending / extension link mechanism 10A is not extended to the state in which the opening angle θ is regulated without being held. Can be rotated.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, the “vehicle seat” of the present invention can be applied to a seat other than a rear seat of an automobile, and may be a seat applied to a vehicle other than an automobile such as a railroad. It can be widely applied to seats used for various vehicles such as ships.

  In addition, the armrest may be provided in a cantilevered manner on the side portion of the seat back, instead of being provided in a shape embedded in the seat back. Further, the deployed position holding mechanism may be provided only on one side of the armrest. Further, when the armrest is provided so as to be embedded in the seat back, the armrest is hinged so as to be rotatable only on one side with respect to the seat back, and the vehicle body is provided with a deployment position holding mechanism on both sides. It may be configured to be connected to.

  Further, the bending / extension link mechanism that constitutes the deployment position holding mechanism may be configured such that the opening angle is narrowed in accordance with the deployment of the armrest and the opening angle is restricted in a narrowing direction. In that case, the bending and stretching link mechanism is configured to rotate in a direction in which the opening angle is widened by the backward inclination of the seat back. Further, the bending / extension link mechanism may be configured to hold the deployed position of the armrest in a state of being deployed at an angle other than horizontal.

  In addition, the configuration in which the links of the bending / extension link mechanism are brought into contact with each other is not limited to the contact structure between the corner portion and the stopper piece as shown in the above-described embodiment, but a structure in which separate members are joined and contacted. Various contact structures such as setting can be applied.

  The configuration of the present invention can also be applied to a configuration in which the seat back is not tilted to a forwardly tilted position where the seatback tilts forward from an upright posture. The forward tilt position of the seat back is not limited to the position where the seat back is folded on the upper surface of the seat cushion, and may be a position where the seat back is in a forward leaning posture.

1 seat (vehicle seat)
1A Right seat area 1B Central seat area 2 Seat back 2A Recess 2B Back frame 2B1 Main body frame 2B2 Subframe 2C Locking device 2D Support bracket 3 Seat cushion 3B Cushion frame 3C Extension bracket 4A Recliner 4B Axle pin 5 Armrest 5A Support shaft 5B Covering extension part 10 Unfolding position holding mechanism 10A Bending-extending link mechanism 11 First link (configuration link)
11A First pin (first connecting point)
11B Corner portion 11B1 Abutting surface 12 Second link (configuration link)
12A Second pin (second connecting point)
12B Stopper piece 13 Third pin S1 to S4 State L1, L2, L3 Vertical bisector C Line segment F Floor (vehicle body)
θ opening angle

Claims (4)

A seat back that is connected to the vehicle body so that the backrest angle can be changed, and an armrest that is connected to the seat back so that it can be unfolded and retracted by tilting around a support shaft that faces the seat width direction. And a deployment position holding mechanism that holds the deployment position of the armrest so that a change in the angle with respect to the vehicle body is suppressed even if the backrest angle of the seat back is changed, and a vehicle seat,
The unfolded position holding mechanism has a bending / extension link mechanism that is pin-coupled between the vehicle body and the armrest so as to bend / extend as the armrest moves up and down,
When the armrest is deployed, the constituent links of the bending / extension link mechanism are rotated in such a manner that the opening angle of the link is changed in one direction and abuts each other, so that the deployment position of the armrest is regulated, and the seat back is tilted backward In addition, the component links of the bending / extension link mechanism are rotated so as to change the opening angle of each other in the other direction, so that the armrest can be deployed to a position where the component links of the bending / extension link mechanism abut each other. A vehicle seat designed to be close to the pre-tilt deployment angle. The vehicle seat according to claim 1,
A vehicle seat in which the bending and stretching link mechanism is bent to the rear side of the armrest. The vehicle seat according to claim 2,
A first connection point pin-connected to the vehicle body of the bending / extension link mechanism is a perpendicular bisector between a deployed position and a storage position of a second connection point pin-connected to the armrest of the bending / extension link mechanism Vehicle seat set at a lower position. In the vehicle seat according to claim 3,
The seatback is configured to be tilted to a forwardly tilted position where the seatback is tilted forward from an upright posture, and the first connecting point of the bending / extending link mechanism is a storage position of the second connecting point at the forwardly tilting position of the seatback. A vehicle seat that is set at a position lower than a perpendicular bisector with a developed position of the second connection point at a backrest angle position before the seat back is tilted forward.

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