JP2017030499A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to hold a seat back at a forward folded position with a simple structure.SOLUTION: A seat 1, in which a seat back 2 is folded to a forward folded position, and is brought into contact with a stopper piece 3A1 of a reclining plate 3A so as to be stopped, has engagement structures 20 which are provided between the seat back 2 and the reclining plate 3A and are elastically engaged with each other. The engagement structures 20 are engaged with each other by folding of the seat back 2 to the forward folded position and are so configured as to hold a state such that movement of the seat back 2 raised from the forward folded position is regulated.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat in which a seat back is brought down to a forward position and can be stopped by hitting a stopper.

  2. Description of the Related Art Conventionally, a vehicle seat is known in which a seat back is connected to a seat cushion via a recliner and is held in a state where a backrest angle is fixed (Patent Document 1). Specifically, the seat back is divided into an intermediate plate integrally coupled to the recliner and a main body frame that is rotatable with respect to the intermediate plate. The main body frame is normally configured to be rotated against the intermediate plate in a state of being biased in the direction of rotating backward with respect to the intermediate plate by the biasing force of the spring. With such a configuration, even when the backrest angle is fixed by the recliner, the seat back is tilted to the forward tilt angle by rotating the main body frame forward against the intermediate plate against the urging force of the spring. Can be switched to the closed state.

JP 2013-147058 A

  However, in the above prior art, even if the seat back is tilted to the forward tilt angle, the seat back is returned to the original position by urging by releasing the hand, so that the usability is poor. The present invention has been created as a solution to the above-described problems, and an object of the present invention is to enable the seat back to be held in the forward position with a simple structure.

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

  A first aspect of the present invention is a vehicle seat in which a seat back can be brought down to a forwardly tilted position and stopped against a stopper, and is provided between the seat back and the stopper and is elastically engaged with each other. It has a structure. The engagement structure is configured such that the seat back is engaged by being brought down to the forward position, and is held in a state in which movement in the direction raised from the forward position of the seat back is restricted.

  According to the first aspect of the present invention, the seat back can be held in the forwardly tilted position by the simple configuration in which the engagement structure that elastically engages with each other is provided between the seat back and the stopper. .

  The second invention is the following configuration in the first invention described above. The engagement structure is configured to engage in the axial direction or the radial direction of the center axis of the tilt-down when the seat back is tilted down to the forward position.

  According to the second aspect of the present invention, the movement of the seat back in the direction raised from the forward tilt position can be appropriately restricted by the engagement structure that engages in the above direction.

  The third invention is the following configuration in the first or second invention described above. The engaging structure is configured such that a protruding member provided on the seat back elastically enters and engages in a recess formed in the stopper.

  According to the third aspect of the invention, by providing the projecting member on the seat back, the projecting member is strongly engaged with the concave portion of the stopper having a high structural strength capable of receiving the seat back at the forwardly tilted position. be able to.

  According to a fourth invention, in any one of the first to third inventions described above, the following configuration is adopted. The engagement structure is configured to have a guide shape that is guided to move in a direction in which the engagement is released by applying a force in a direction that is lifted from the forward-down position to the seat back.

  According to the fourth aspect of the present invention, even when the engagement structure is provided, the seat back is applied with a force in a direction to be raised from the forward position with a strong force exceeding the engagement force of the engagement structure. The engagement state can be easily released to raise the seat back.

1 is a perspective view illustrating a schematic configuration of a vehicle seat of Example 1. FIG. It is the perspective view showing the state which operated the walk-in lever and fell the seat back to the front position. It is the side view which expanded and represented the principal part structure of the vehicle seat. It is the side view which visualized and represented the support plate. It is the VV sectional view taken on the line of FIG. It is a side view showing the state where the backrest angle of the seat back was adjusted by the operation of the recliner. It is a side view showing the state where the hook of the memory mechanism was removed. It is the side view showing the state where the seat back was brought down to the forward position and locked. It is the IX-IX sectional view taken on the line of FIG. FIG. 9 is an enlarged view as viewed in X of FIG. 8.

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

<Basic structure of sheet 1>
First, the configuration of the seat 1 (vehicle seat) according to the first embodiment will be described with reference to FIGS. First, the basic configuration of the seat 1 will be described with reference to FIGS. The seat 1 according to the present embodiment is configured as a left-side seat in the second row of an automobile provided with a three-row seat. As shown in FIG. 1, the seat 1 includes a seat back 2 that serves as a backrest for a seated person, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a headrest.

<Seatback 2>
The seat back 2 described above is connected to the rear end portion of the seat cushion 3 through a pair of left and right electric recliners 5 so that the backrest angle can be adjusted. Each of the recliners 5 is normally held in a state where the backrest angle of the seat back 2 is fixed. Each of the recliners 5 is operated by pressing and tilting a switch 5A provided on a vehicle outer side facing the entrance / exit door (not shown) side of the seat cushion 3 so as to correspond to the backrest angle of the seat back 2. It is driven and rotated so as to be tilted in the direction.

<Seat cushion 3>
The seat cushion 3 is connected to a vehicle floor in a state in which the position can be adjusted in the front-rear direction via a pair of left and right electric slide rails 6. The slide rails 6 are normally held in a state where the front and rear positions of the seat cushion 3 are fixed. Each slide rail 6 is driven so as to push the front / rear position of the seat cushion 3 in the corresponding operation direction by an operation of pushing / pulling the switch 6A provided on the side of the seat cushion 3 outside the vehicle back and forth. It is like that.

<Walk-in function>
By the way, the above-described seat back 2 is provided with a walk-in lever 2 </ b> A that allows the seat back 2 to be brought down to the forward tilt position where the forward tilt posture shown in FIG. Yes. The walk-in lever 2A operates the memory mechanisms 10 provided at the connecting portions on the left and right sides of the seat back 2 and the seat cushion 3 by operating the front side thereof without operating the recliners 5. The seat back 2 is fixed in a state in which the backrest angle is released, and the seat back 2 is configured to be rotated forwardly around a connecting shaft 15 of each memory mechanism 10 to be described later.

  By operating the walk-in lever 2A, the seat 1 can be quickly brought down to the forward position without depending on the operation of each recliner 5. Then, by moving the seat back 2 forward, the space behind the seat 1 is widened, and the user gets on and off the third row of seats (not shown) from the entrance door outside the vehicle (not shown). Is widely secured.

  After the seat back 2 is pushed down to the forward position by the operation of the above-described walk-in lever 2A, the user manually pushes the seat back 2 back to the rear side, thereby operating the memory mechanisms 10 described above. The backrest angle before being moved forward is fixed and fixed. With such a configuration, the seat back 2 can be brought down to the forward position described above by operating the walk-in lever 2A described above, regardless of the position at which the backrest angle is adjusted. After that, it can be easily returned to the backrest angle before it was moved forward.

  Here, the seat back 2 described above is rotated to the reclining plate 3 </ b> A shown in FIG. 3 that is coupled to the rear end portions of the left and right sides of the seat cushion 3 that supports the seat back 2 by being tilted to the above-described forwardly tilted position. It is held in a stopped state. Here, each reclining plate 3 </ b> A corresponds to a “stopper” of the present invention. As shown in FIG. 9, each reclining plate 3 </ b> A is connected to the lower end portion of each side frame 2 </ b> B of the seat back 2 via each recliner 5 and each memory mechanism 10 described above. Each reclining plate 3A is formed of a steel plate material that is thicker than each side frame 2B and has a higher structural strength, so that the seat back 2 can be strongly supported from below, and the seat back 2 The forward-turning rotation is also brought into contact and can be received strongly.

  Further, between the side frames 2B of the seat back 2 and the reclining plates 3A, as shown in FIG. 8, the seat back 2 is elastically engaged with each other when the seat back 2 is tilted to the forwardly tilted position. An engagement structure 20 is provided that restricts rotational movement of the back 2 in the raising direction from the forward position. By means of the engagement structures 20 described above, the seat back 2 is stably held at the position where the seat back 2 is tilted to the forward position. Each of the engagement structures 20 is in an elastically engaged state by retracting the seat back 2 to the forward position, but a force in a direction to be raised on the seat back 2 with a strong force exceeding these engagement forces. The engagement is disengaged by being hooked. Thereby, each engagement structure 20 is easily released without requiring a special release operation, and the seat back 2 can be raised to its original position.

<Specific configuration of each mechanism>
Hereinafter, the electric recliner 5, the memory mechanism 10, and the engagement provided between the side frames 2 </ b> B of the seat back 2 and the reclining plates 3 </ b> A coupled to the rear end portions of the left and right sides of the seat cushion 3. A specific configuration of the combined structure 20 will be described with reference to FIGS. Since these are a pair of configurations that are symmetrical to each other, only the configuration on one side arranged on the outside of the vehicle will be described in detail below as a representative.

<Recliner 5>
First, the configuration of the recliner 5 will be described. In addition, since the recliner 5 has a known configuration disclosed in documents such as Japanese Patent Application Laid-Open No. 2011-240758, only the structure of the main part will be briefly described below. As shown in FIGS. 3 to 4 and 9, the recliner 5 is disposed between the side frame 2 </ b> B of the seat back 2 and the reclining plate 3 </ b> A disposed to face the outside, These are connected in such a manner that they can be rotated relative to each other.

  Specifically, as shown in FIG. 9, the recliner 5 includes an external gear 5 </ b> B connected to the outer side of the side frame 2 </ b> B of the seat back 2 via an intermediate plate 11 of a memory mechanism 10 described later, and a reclining plate. And an internal gear 5C connected to the inner side of 3A, and these are assembled in a state where they can be rotated relative to each other while changing their meshing positions. The relative rotation between the external gear 5B and the internal gear 5C is performed by rotating the operation shaft 5D passed through the central portion of the internal gear 5C in response to transmission of a rotation output from a drive motor (not shown). ing. Specifically, the operation shaft 5D is driven by a connecting rod 5F having a hexagonal cross section that is inserted between the operation shaft 5D of the recliner 5 on the opposite side in the axial direction and connected to the drive motor (not shown). Due to the rotation, the rotation of the drive motor is transmitted via the connecting rod 5F and the rotation is received.

  When the rotation of the drive motor (not shown) is stopped, the external gear 5B and the internal gear 5C are pressed against each other in a deep meshing state without backlash by the urging force of the spring 5E and from the drive motor (not shown). By receiving the braking force, it is held in a state where the rotation is strongly stopped. The external gear 5B and the internal gear 5C are moved in the respective operation directions corresponding to the operation shaft 5D via the connecting rod 5F, when the drive motor (not shown) is driven and rotated in either the forward or reverse direction. It is rotated so that the mutual meshing position is gradually changed.

<Memory mechanism 10>
Next, the configuration of the memory mechanism 10 will be described. As shown in FIGS. 3 to 4 and 9, the memory mechanism 10 includes an intermediate plate 11 interposed between the side frame 2 </ b> B of the seat back 2 and the external gear 5 </ b> B of the recliner 5, and the intermediate plate 11. A hook 12 connected to the side frame 2B of the seat back 2 so that it can be engaged and disengaged from the outer periphery side, and a pole 13 that is also connected to the side frame 2B of the seat back 2 and operates the hook 12 to engage and disengage. And a connecting shaft 15 that rotatably connects the side frame 2B of the seat back 2 to the intermediate plate 11.

  As shown in FIG. 9, the intermediate plate 11 is formed of a substantially disk-shaped member, and is integrally welded to the outer surface of the external gear 5 </ b> B of the recliner 5 described above. As shown in FIG. 4, the intermediate plate 11 is partially formed with unevenness 11B arranged in the circumferential direction on the outer peripheral portion of the upper region, and the unevenness 12B of the hook 12 described later is formed on the unevenness 11B. By being fitted from above, the hook 12 and the rotation direction are integrated. As shown in FIG. 9, the intermediate plate 11 is disposed to face the outside of the side frame 2B of the seat back 2, and is formed in the round hole 11A formed in the center and the side frame 2B of the seat back 2. The connecting shaft 15 is inserted through the bush 15A in the axial direction across the round hole 2B1, and is connected to the side frame 2B so as to be relatively rotatable.

  As shown in FIGS. 3 to 4, the hook 12 is formed of a flat plate-like member that is long in the front-rear direction, and is sandwiched between a support plate 14 and a side frame 2 </ b> B of the seat back 2, which will be described later. Placed in position. The hook 12 is rotatably connected to a front end portion of the hook 12 by a support shaft 12A that is passed through the support plate 14 and the side frame 2B of the seat back 2 in the axial direction. As shown in FIG. 4, the hook 12 has an uneven surface 12 </ b> B aligned in the front-rear direction on the lower surface portion on the rear end side, and the outer peripheral portion of the intermediate plate 11 described above by rotation about the support shaft 12 </ b> A. The unevenness 12B can be engaged with the unevenness 11B formed on the surface (see FIG. 4) or removed (see FIG. 7). The hook 12 is integrated with the intermediate plate 11 in the rotational direction by fitting the unevenness 12B described above into the unevenness 11B of the intermediate plate 11, and the side frame 2B of the seat back 2 is attached to the intermediate plate 11. So that they are integrated in the rotational direction.

  As shown in FIGS. 3 to 4, the pole 13 is formed by a flat plate member that is long in the height direction, and is sandwiched between a support plate 14 (to be described later) and a side frame 2 </ b> B of the seat back 2. It is provided at the position. The upper end of the pole 13 is rotatably connected to a support shaft 13A passed through the support plate 14 and the side frame 2B of the seat back 2 in the axial direction. As shown in FIG. 4, the pole 13 is normally rotated and biased counterclockwise by a spring (not shown), and the lower end thereof is pressed against the upper surface of the hook 12 described above. Has been.

  As a result, the pole 13 presses the hook 12 downward by the force applied to the urging force so that the unevenness 12B of the hook 12 is pushed into and engaged with the unevenness 11B of the intermediate plate 11. To hold. As shown in FIG. 7, the pawl 13 is formed in the hook 12 by moving the walk-in lever 2A described above with reference to FIG. The hook 12 is hung on the hook 12C from below to lift the hook 12 upward. By the operation of the pole 13, the unevenness 12 </ b> B of the hook 12 is removed from the unevenness 11 </ b> B of the intermediate plate 11, and the side frame 2 </ b> B of the seat back 2 rotates around the connecting shaft 15 described above with respect to the intermediate plate 11. It will be in a state that can.

  As shown in FIG. 3, the support plate 14 is formed of a flat plate-like member, and is integrally coupled to the outer side portion of the side frame 2B of the seat back 2 described above, so that the side frame 2B and the reclining plate 3A are joined. Are assembled in a state of covering the outside from the outside. Specifically, the lower end of the support plate 14 is inserted in the axial direction into the extension shaft 14A attached to the end of the connecting rod 5F having the hexagonal cross section described above with reference to FIG. It is made into the state supported by the shaft so that rotation was possible.

  As shown in FIG. 3, the support plate 14 is disposed in a state in which the hook 12 and the pole 13 are sandwiched in the axial direction with respect to the side frame 2 </ b> B of the seat back 2. The above-mentioned support shafts 12A and 13A for supporting the shaft in a rotatable manner and the coupling shaft 14B different from these are respectively inserted and assembled in the axial direction so as to be integrally fastened to the side frame 2B. It is in a state. Each of the support shafts 12A, 13A and the coupling shaft 14B described above are disposed at positions close to the front and rear edges and the upper edge of the support plate 14, respectively, and are wide in the front-rear direction and the height direction. It is in a state of being provided with an arrangement interval.

  The support plate 14 described above is formed with a bent portion 14C that is bent inwardly in a crank shape at an intermediate position extending upward from the outside of the reclining plate 3A to the outside of the side frame 2B of the seat back 2. It becomes the composition. Due to the bent portion 14C, the support plate 14 is disposed on the outside of the reclining plate 3A with its surface parallel to the reclining plate 3A in the width direction, and on the outside of the side frame 2B of the seat back 2, the side frame 2B and the surface are arranged in parallel with the width direction.

  As shown in FIG. 8, the bent portion 14 </ b> C has a stopper piece 3 </ b> A <b> 1 formed so that the front edge of the seatback 2 protrudes to the upper edge of the reclining plate 3 </ b> A when the seatback 2 is tilted forward. It functions as a locking portion that is locked in contact with the. The bent portion 14C has a front edge substantially formed at a position on a line segment connecting the extension shaft 14A and the coupling shaft 14B in the support plate 14 described above. The extension shaft 14A and the coupling shaft 14B With the structure that is strongly supported by the upper and lower sides, the forward tilting rotation of the seat back 2 can be strongly locked. The bent portion 14C is used not only when the seat back 2 is pushed down to the forward position by the operation of the walk-in lever 2A described above with reference to FIG. Also, the stopper piece 3A1 is brought into contact with and locked.

  In summary, the memory mechanism 10 described above is configured as follows. That is, as shown in FIG. 4, the memory mechanism 10 normally has the side frame 2 </ b> B of the seat back 2 in a state in which the above-described hook 12 is fitted to the intermediate plate 11 with the unevenness 12 </ b> B and 11 </ b> B. The intermediate plate 11 is integrally connected. In this state, as shown in FIG. 6, the seat back 2 is integrated with the intermediate plate 11 and the backrest angle is changed in the front-rear direction by the operation of each recliner 5.

  In the memory mechanism 10, when the walk-in lever 2 </ b> A described above with reference to FIG. 2 is pulled up, the pole 13 is rotated in the clockwise direction as shown in FIG. Is operated to be lifted from the fitted state with the intermediate plate 11. By this operation, the state in which the side frame 2B of the seat back 2 and the intermediate plate 11 are integrated in the rotational direction is released, and the seat back 2 rotates in the front-rear direction with respect to the intermediate plate 11 about the connecting shaft 15. It becomes a state that can be done. Therefore, next, as shown in FIG. 8, when the seat back 2 is tilted to the forward position, the bent portion 14C of the support plate 14 contacts the stopper piece 3A1 of the reclining plate 3A, and the seat back 2 is It will be in the state locked in the forward position.

  When the seat back 2 is tilted slightly forward from the position after the hook 12 is removed from the fitting state with the intermediate plate 11 as described above, the memory mechanism 10 can stop the operation of the walk-in lever 2A. As a state where the unevenness 12B of the hook 12 rides on the outer peripheral surface curved in an arc shape of the intermediate plate 11, the unevenness 12B of the intermediate plate 11 is held in a state of not being fitted to the unevenness 11B. Therefore, when the seat back 2 is tilted forward from the release position, the memory mechanism 10 can tilt the seat back 2 toward the forward tilt position without continuing the operation of the walk-in lever 2A. The hook 12 can be slid on the outer peripheral surface of the intermediate plate 11.

  Since the memory mechanism 10 is kept in the released state even when the operation of the walk-in lever 2A is not continued when the seat back 2 is tilted to the forward position, the user simply lifts the seat back 2 backward. The seat back 2 can be returned to the backrest angle before being moved forward by simply raising the side. The memory mechanism 10 is returned to the backrest angle before the seat back 2 is moved forward, so that the hook 12 is returned to the state shown in FIG. The frame 2B is returned to the initial state in which the frame 2B is integrally connected to the intermediate plate 11.

<Engagement structure 20>
Next, the configuration of the engagement structure 20 will be described. As shown in FIGS. 3 and 8, the engagement structure 20 includes a metal leaf spring 21 integrally coupled to the support plate 14 described above, and the leaf spring 21 is tilted forward of the seat back 2 described above. Thus, at a position over the front side of the stopper piece 3A1 of the reclining plate 3A, it is configured to elastically enter and engage with the space area on the front side of the stopper piece 3A1. Here, the leaf spring 21 corresponds to the “protruding member” of the present invention, and the space area on the front side of the stopper piece 3A1 corresponds to the “concave portion” of the present invention. Specifically, the leaf spring 21 has a shape in which the lower end portion is fastened by the rivet 21B and extends upward at the upper edge portion of the lower region supported by the extension shaft 14A of the support plate 14 described above. Is provided.

  Specifically, as shown in FIG. 9, the lower end of the leaf spring 21 is fastened to the outer side of the support plate 14 described above, and is cranked inward from the fastening portion toward the upper side. The shape is bent and extended. A protrusion 21A that is pushed out so as to protrude inward is formed in a region of the leaf spring 21 that is bent and extended in a crank shape. As shown in FIG. 8, the protrusion 21A is formed by being extruded into an oval shape when viewed from the side, and as shown in FIG. Yes. Specifically, the protrusion 21A has a configuration formed in an oval shape that is tapered forward.

  As described above, the lower end of the leaf spring 21 is cantilevered by being applied to the outer side of the support plate 14, so that the protrusion 21A is formed with the lower end fastened by the rivet 21B as a fulcrum. The upper end portion can be flexibly bent inward and outward. When the leaf spring 21 is in its free state, the above-described region where the protrusion 21A is bent and extends in a crank shape is positioned slightly outside the reclining plate 3A, and the protrusion 21A is the reclining plate 3A. And arranged so as to overlap in the width direction. As a result, as shown in FIGS. 4 and 6, the leaf spring 21 causes the protrusion 21A to ride on the outer surface of the reclining plate 3A by a movement in which the backrest angle of the seat back 2 is adjusted (see FIG. 4 to FIG. 5) It is removed from the outer surface to the rear side (FIG. 6).

  At this time, when the plate spring 21 rides from the rear side on the outer surface of the reclining plate 3A from the position where the projection 21A is removed from the rear side of the reclining plate 3A, the leaf spring 21 is tapered toward the front side of the projection 21A. It climbs on the outer surface of the reclining plate 3A from the tip swelled in an oval shape. Therefore, the leaf spring 21 is pushed and bent with a light force to the outside by a reaction force received from the reclining plate 3A by the curved surface inclined by the taper of the protrusion 21A, and smoothly on the outer surface of the reclining plate 3A. You can get on. Specifically, the leaf spring 21 rides on the outer surface of the stopper piece 3A1 formed so as to partially protrude from the upper edge portion of the reclining plate 3A and protrudes rearward. Or have been removed.

  As shown in FIGS. 8 to 9, the leaf spring 21 moves the above-described protrusion 21 </ b> A forward on the outer surface of the stopper piece 3 </ b> A <b> 1 of the reclining plate 3 </ b> A when the above-described seat back 2 is tilted to the forward-tilted position. It will be in the state moved to the position exceeding it. As a result, the leaf spring 21 is in a state in which the protrusion 21A is dropped into the space area on the front side of the front slope 3A2 that drops obliquely to the lower side, which is the front side surface of the stopper piece 3A1, by the restoring force. Due to this drop, the rotational movement of the seat back 2 in the raising direction is brought into a state where the protrusion 21A of the leaf spring 21 hits (holds) the front inclined surface 3A2 of the reclining plate 3A.

  Specifically, as shown in FIG. 10, the leaf spring 21 has been described above because the swollen portion on the buttocks side (rear side) of the projection 21 </ b> A projecting in an oval shape hits the front slope 3 </ b> A <b> 2 of the reclining plate 3 </ b> A. The tapered portion on the opposite side (front side) to the buttocks side receives a force that is pressed against the reclining plate 3A with a greater force than when it is applied to the reclining plate 3A from the rear side. . The protrusion 21A of the leaf spring 21 is held in a state in which the rotation of the seat back 2 in the raising direction is stopped by the locking force that receives the force applied to the front slope 3A2 of the reclining plate 3A.

  However, since the bulge on the butt side (rear side) of the projection 21A of the leaf spring 21 is also curved in an oval shape, the user has a strong force exceeding the locking force with respect to the seat back 2. By applying a force in the direction of lifting up, the protrusion 21A rides on the outer side surface from the front slope 3A2 of the reclining plate 3A by the curved-shaped guide on the buttocks side, and with the front slope 3A2 of the reclining plate 3A The rotation stop state due to the contact is released. Therefore, by raising the seat back 2 as it is, the seat back 2 is returned to the backrest angle before the seat back 2 is tilted forward.

<Summary>
In summary, the sheet 1 of the present embodiment has the following configuration. That is, the seat 1 is a seat 1 that can be brought down to a forwardly tilted position and stopped against the stopper piece 3A1 (stopper) of the reclining plate 3A. It has an engagement structure 20 that is elastically engaged. The engagement structure 20 is configured to be engaged when the seat back 2 is brought down to the forward position, and to keep the movement of the seat back 2 in the direction raised from the forward position.

  In this way, the seat back 2 can be held in the state of being brought down to the forward position by a simple configuration in which the engagement structure 20 that elastically engages with each other is provided between the seat back 2 and the reclining plate 3A. .

  The engagement structure 20 is configured to engage in the axial direction of the center axis (the rotation center of the recliner 5 or the connecting shaft 15) of the tilting when the seat back 2 is tilted to the forward tilted position. With the engagement structure 20 that engages in the above-described direction, the movement of the seat back 2 in the direction that is raised from the forward-down position can be appropriately restricted.

  Specifically, in the engagement structure 20, the leaf spring 21 (protruding member) provided on the seat back 2 elastically enters a space area (concave portion) on the front side of the front slope 3 </ b> A <b> 2 formed on the reclining plate 3 </ b> A. It is the structure engaged by. In this way, by providing the leaf spring 21 on the seat back 2 and hanging on the reclining plate 3A, the reclining plate 3A having a high structural strength capable of receiving the seat back 2 in the forward tilted position, The leaf spring 21 can be strongly engaged.

  The engagement structure 20 has a guide shape (the projection 21A of the leaf spring 21 has an oval shape) that is moved and guided in a direction in which the engagement is disengaged by applying a force in a direction that is lifted from the forward position to the seat back 2. The shape is curved and protrudes. With such a configuration, even when the engagement structure 20 is provided, the seat back 2 is applied with a force in a direction to be raised from the forward position by a strong force exceeding the engagement force of the engagement structure 20. The engagement state of the engagement structure 20 can be easily released and the seat back 2 can be raised.

  Further, the engagement structure 20 is configured such that the protrusion 21A of the leaf spring 21 provided on the seat back 2 is engaged by dropping into the area beyond the front slope 3A2 of the stopper piece 3A1 of the reclining plate 3A. Thus, the engagement structure 20 can be obtained with a simple configuration in which the leaf spring 21 is provided on the seat back 2 side without forming a recess for engagement in the reclining plate 3A.

<Other embodiments>
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. The present invention can also be widely applied to seats used for various vehicles such as the above.

  In addition, the engagement structure of the present invention is not limited to the forward tilt position as shown in the above-described embodiments, but the seat back is locked at the upright position or the large-down position where the seat back is folded into the upper surface of the seat cushion. It may be configured to be allowed to. Further, the engaging structure is provided between the seat back and the stopper, for example, such that the protruding member provided on the stopper elastically enters and engages in the recess provided on the seat back, and is elastic to each other. As long as it is configured to engage with each other. Further, elastic members may be provided on both the seat back side and the stopper side, and these may be elastically engaged with each other. The engagement structure is not limited to being engaged in the axial direction of the central axis of the seat back falling down, but may be engaged in the radial direction or the rotational direction. However, in the case of the one that engages in the rotation direction, it is difficult to adjust the strength of the engagement force.

  In addition, the engagement structure is configured to exhibit a strong engagement force that does not disengage even when a force in the direction of raising the seat back from the forward position is applied, and the engagement state of the engagement structure is provided separately. It is good also as a structure cancelled | released by cancellation | release operation of a cancellation | release member. By doing so, the seat back can be stably stopped by the forward position. Further, the engagement structure does not necessarily have to be provided as a pair on the left and right sides of the seat back, and may be provided on either one of them.

  Further, as the mechanism for connecting the seat back to the base (seat cushion) on the floor in a state in which the backrest angle can be adjusted, an electric recliner has been exemplified in the above embodiment, but instead, A manual lock / release operation type recliner as disclosed in documents such as Japanese Patent Application Publication No. 2015-30342 may be applied. In addition, as a mechanism that allows the seat back to be tilted to the forward position, the intermediate position of the frame away from the recliner arrangement position as disclosed in Japanese Patent Application Laid-Open No. 2010-247575 is rotated in the forward direction by a hinge. A mechanism that is divided as much as possible may be employed so that the seat back can be tilted forward to the position by unlocking the hinge. Further, as a mechanism that allows the seat back to be tilted to the forward position, a mechanism disclosed in Japanese Patent Application Laid-Open No. 2013-147058 shown in [Background Art] may be employed.

1 seat 2 seat back 2A walk-in lever 2B side frame 2B1 round hole 3 seat cushion 3A reclining plate (stopper)
3A1 Stopper piece 3A2 Front slope 4 Headrest 5 Recliner 5A Switch 5B External gear 5C Internal gear 5D Operating shaft 5E Spring 5F Connecting rod 6 Slide rail 6A Switch 10 Memory mechanism 11 Intermediate plate 11A Round hole 11B Uneven 12 Hook 12A Support shaft 12B Hanging portion 13 Pole 13A Support shaft 14 Support plate 14A Extension shaft 14B Coupling shaft 14C Bending portion 15 Connection shaft 15A Bush 20 Engaging structure 21 Leaf spring (protruding member)
21A Protrusion 21B Rivet

Claims (4)

A vehicle seat that can be pushed down to a position where the seat back is pushed forward and stopped against a stopper,
An engagement structure provided between the seat back and the stopper to engage elastically with each other;
The engagement structure is a vehicle seat that is configured to be engaged when the seat back is tilted to a forward position, and to keep the seat back from being moved in a direction raised from the forward position. The vehicle seat according to claim 1,
The engagement structure is a vehicle seat configured to be engaged in an axial direction or a radial direction of a center axis of the tilt-down when the seat back is tilted to a forward tilt position. The vehicle seat according to claim 1 or 2,
The engagement structure is a vehicle seat in which a protruding member provided on the seat back elastically enters and engages in a recess formed in the stopper. The vehicle seat according to any one of claims 1 to 3,
A vehicle seat in which the engagement structure includes a guide shape that is moved and guided in a direction in which engagement is disengaged by applying a force in a direction in which the seat back is lifted up from a forward position.

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