JP5499691B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. More specifically, the present invention relates to a vehicle seat configured such that a seating position of a seat cushion changes in conjunction with a change in a seat back backrest angle.

  Conventionally, in a vehicle seat, a seat cushion is linked to a base fixed on the vehicle body floor and a seat back, and is configured to move back and forth in conjunction with the tilting rotation of the seat back. It has been. Here, in the following document 1, the seat back is connected to the base via the reclining device, the front part of the seat cushion is linked to the base by the front link, and the rear part of the seat cushion is the seat. A vehicle seat linked to a lower end portion of a back is disclosed. In this disclosure, the seat cushion is operated to move obliquely forward and upward while accompanying the link movement of the front link as the seat back moves backward.

Japanese Utility Model Publication No. 4-29436

  However, in the related art disclosed above, when the seat back is tilted backward to the position where it is in the comfort posture, the seat cushion moves forward and upward without changing its angle, so that the seat back tilts backward. The seat occupant's hips can easily slide forward with respect to the seat cushion.

  The present invention was devised as a solution to the above-described problem, and the problem to be solved by the present invention is to prevent the seat occupant from sliding forward against the seat cushion even if the seat back is tilted backward to the comfort posture. It is to be able to prevent suitably.

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 configured such that the seating position of the seat cushion changes in conjunction with a change in the seat back backrest angle. The seat back is connected to the base that supports the seat cushion so that the backrest angle can be adjusted. The seat cushion is connected to the base so that the front part is movable, and the rear part rotates with respect to the extension part formed by extending the shape downward from the connection part with the base of the seat back. Linked to possible state. The connection between the front portion of the seat cushion and the base is a link connection via a link member that is rotatably connected to the front portion and the base of the seat cushion. The seat cushion is connected to the seat back and the seat back by moving backward from the first angular position where the seat back is normally used as a backrest to the second angular position where the seat back is tilted backwards to an easy backward leaning posture. The position of each connection point is set so that the connection point between the cushion and the link member moves so that the inclination posture with respect to the base of the seat cushion is inclined in the forward upward direction.

  According to the first aspect of the invention, the seat back is pushed by this movement by tilting the seat back from the first angular position used as a backrest in a normal state to the second angular position where the backward tilting posture is comfortable. As a result, the link member rotates, and the tilting posture of the seat cushion with respect to the base tilts upward. Thereby, even if the seat back is tilted backward to the comfort posture, it is possible to suitably prevent the seat occupant from sliding forward with respect to the seat cushion.

  Next, in a second aspect based on the first aspect described above, the connection point between the rear portion of the seat cushion and the extension portion of the seat back is a base when the seat back is in the first angular position. It is set at a position on the rear side of the connection point. This connection point passes through a movement trajectory that descends in the height direction due to the movement of the seat back tilting backward from the first angular position to the second angular position, but the seat back further tilts backward from the second angular position. With respect to the movement, the inclination posture with respect to the base of the seat cushion is brought close to the horizontal posture through a movement locus that rises in the height direction.

  According to the second aspect of the invention, by further tilting the seat back backward from the second angular position where the seat back is in the comfort posture, the height position of the rear portion of the seat cushion is raised and brought close to the height position of the seat back. At the same time, the tilted posture of the seat cushion is brought close to the horizontal posture. Therefore, it is possible to satisfactorily move the seat back and the seat cushion closer to a full flat.

FIG. 3 is a perspective view illustrating a main part of the configuration of the vehicle seat according to the first embodiment. It is the side view which showed the normal posture state of the vehicle seat. It is the side view which showed the state which made the seat back lean backward and made it the comfortable posture. It is the side view which showed the state which fell down the seat back to the back side.

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

  First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 to 3, the vehicle seat 1 according to the present embodiment assumes a comfortable posture from an angular position (first angular position shown in FIG. 2) in which the seatback 2 is used as a backrest during normal times. By tilting backward to the angular position (second angular position shown in FIG. 3), this movement causes the tilt posture of the seat cushion 3 to be tilted in the forward upward direction.

  Thus, when the vehicle seat 1 is used with the seat back 2 in the comfortable posture, the above-described seat cushion 3 is brought into the forward tilted posture state, and the seat passenger's buttocks move forward and slide Can be suitably prevented, and a stable comfortable posture state in which the front part of the buttocks does not occur can be formed. Hereinafter, the connecting structure of both of which the tilting posture of the seat cushion 3 is tilted in the forward upward direction by the backward tilting motion of the seat back 2 described above will be described in detail.

  Here, the right side of the vehicle seat 1 in FIG. 1 is omitted in FIG. 1, but the basic configuration is symmetrical with respect to the left and right. Specifically, first, the seat back 2 is configured by a back frame 2F in which an internal skeleton structure is assembled in an inverted U shape. This back frame 2F is composed of side frames 2Fa and 2Fa made of a pair of left and right vertically elongated steel plate members arranged opposite to each other, and the upper portion of the skeleton structure of the back frame 2F. The side frames 2Fa and 2Fa are constituted by an upper frame 2Fc made of a steel pipe member that is bent so as to connect the upper ends of the side frames 2Fa.

  The upper end portions of these side frames 2Fa, 2Fa and the end portions on each side of the upper frame 2Fc are welded to each other and are firmly and rigidly joined together. As a result, the back frame 2F is assembled as an inverted U-shaped rigid frame by the side frames 2Fa, 2Fa and the upper frame 2Fc described above. The above-described back frame 2F is integrally formed on a vehicle floor (not shown) through reclining devices 4 and 4 that function as rotation shaft devices that can be rotated at the lower ends of both side frames 2Fa and 2Fa, respectively. Are connected to bases 5 and 5 fixed to each other.

  The above-described bases 5 and 5 are arranged to face both outer sides of both side frames 2Fa and 2Fa of the above-described seat back 2, and are welded to a vehicle floor (not shown) and firmly integrated. Are rigidly connected. Each of the reclining devices 4 and 4 is held in a state where the seat back 2 is normally prevented from rotating with respect to the bases 5 and 5, and is not attached to the outer side of the vehicle seat 1 (not shown). By operating the provided operating lever, the rotation stop state is simultaneously released.

  Specifically, each of the reclining devices 4 and 4 described above has a structure in which the two disk-shaped members are assembled so as to be relatively rotatable with respect to each other, and the operation shaft inserted through the center portion thereof. By a rotation operation (not shown), the relative rotation can be switched to a permitted state or a restricted state. The reclining devices 4 and 4 are arranged so as to be sandwiched between the side frames 2Fa and 2Fa on each side of the seat back 2 and the bases 5 and 5 arranged opposite to each other. Each disk-shaped member is integrally rigidly connected to the side frames 2Fa and 2Fa or the bases 5 and 5 on each side of the seat back 2 facing them.

  On the other hand, the operation shafts (not shown) inserted through the central portions of the reclining devices 4 and 4 are connected by the rod 4A so as to be integrated with each other in the rotation direction. By operating the above-described operation lever (not shown) directly connected to the shaft, they are simultaneously rotated to release the rotation-stopped states of the reclining devices 4 and 4 at the same time. Then, by this release operation, the seat back 2 changes the backrest angle in the front-rear direction around the rotation centers 4R and 4R where the disk-like members described above are rotated relative to the bases 5 and 5. It is switched to a state where it can rotate.

  Here, the seat back 2 is always in front of the bases 5 and 5 by a pair of left and right spiral springs (not shown) that are hooked between the side frames 2Fa and 2Fa and the bases 5 and 5 on each side. It is in a state of being biased in the direction of falling and rotating. As a result, the seat back 2 is rotated so that the seat back 2 is tilted forward by the spring urging force of the pair of left and right spiral springs (not shown) when the rotation stop state is released. It has become.

  Next, the configuration of the seat cushion 3 will be described. The seat cushion 3 is configured by a cushion frame 3F having an internal skeleton structure assembled in a square frame shape. Specifically, the cushion frame 3F is configured by side frames 3Fa and 3Fa made of steel plates that are long in the front-rear direction and arranged in a pair of left and right sides that are opposed to each other. The skeletal structure is constituted by a front frame 3Fc made of a steel pipe member that is bent so as to connect the front ends of both side frames 3Fa, 3Fa.

  The front end portions of the side frames 3Fa and 3Fa and the end portions of the front frame 3Fc are welded to each other and are firmly and integrally joined. As a result, the cushion frame 3F is configured as a U-shaped rigid frame by the side frames 3Fa, 3Fa and the front frame 3Fc described above. Further, a reinforcing frame 3Fd made of a steel pipe member is bridged between the rear portions of both the side frames 3Fa, 3Fa, and both end portions thereof are firmly integrated with the side frames 3Fa, 3Fa by welding. It is rigidly connected to.

  Thus, the cushion frame 3F is a rigid frame that is a square rigid body. In the cushion frame 3F, the rear ends of the side frames 3Fa and 3Fa are respectively connected to the lower ends (extension portions 2Fa1) of the side frames 2Fa and 2Fa on the respective sides of the seat back 2 by connecting pins 6B and 6B. , 2Fa1) is pin-coupled so as to be rotatable. Specifically, the connecting pins 6B and 6B are extended on the respective sides of the side frames 2Fa and 2Fa on the respective sides of the seat back 2 so as to extend below the rotation centers 4R and 4R with respect to the respective bases 5 and 5. The parts 2Fa1 and 2Fa1 are connected to each other.

  In the cushion frame 3F, the front side portions of the side frames 3Fa and 3Fa are rotatably linked to the bases 5 and 5 on each side via link members 6A and 6A, respectively. Here, each link member 6A, 6A is formed of a vertically long steel plate member, and the upper end portions thereof are rotatable to the side frames 3Fa, 3Fa on each side of the cushion frame 3F by connecting pins 6A1, 6A1, respectively. The lower ends of the pins are connected to the bases 5 and 5 on each side by connecting pins 6A2 and 6A2, respectively.

  As shown in FIG. 2, the seat cushion 3 linked to the seat back 2 and the bases 5 and 5 as described above is in a rearward tilted posture state in which the seat back 2 is used as a backrest in a normal state. (Corresponding to the first angular position of the present invention), the positions of the connecting pins 6B, 6B, which are the connecting points with the seat back 2, are the rotational centers 4R, 4R of the seat back 2. It is hold | maintained in the state located in the back side rather than. Further, the link members 6A and 6A are held in a posture in which they are inclined backward with respect to the bases 5 and 5, respectively.

  As shown in FIG. 3, the above-described seat cushion 3 becomes a connection point with the above-described seat back 2 by tilting the above-described seat back 2 backward from the angular position (first angular position) in FIG. 2. The connecting pins 6B and 6B are moved forward and downward around the rotation centers 4R and 4R of the seat back 2, respectively, so that the rear portion of each side is in a posture in which it sinks downward. As the connecting pins 6B and 6B move forward and downward, the connecting points (the connecting pins 6A1 and 6A1) between the seat cushion 3 and the upper ends of the link members 6A and 6A on the respective sides are forward sides. The link members 6A and 6A are linked and moved so as to be lifted forward relative to the bases 5 and 5, respectively.

  As a result, the connecting points (the connecting pins 6A1 and 6A1) on the upper end side of the link members 6A and 6A described above are pushed and moved forward and upward as the link members 6A and 6A move. 3 becomes a posture state in which the front part is lifted upward. As a result, the seat cushion 3 is tilted in the forward upward direction from the normal inclined posture state shown in FIG. 2 by the movement of the rear part sinking downward and the movement of the front part rising upward. It is preferable that the seat occupant's buttocks easily slide forward when the seat back 2 is tilted back to the comfort posture shown in FIG. 3 (corresponding to the second angular position of the present invention). Can be prevented.

  In addition, the seat cushion 3 described above is configured such that when the seat back 2 is further tilted backward from the comfort posture state shown in FIG. 3 above, the connection point (the connection pin 6B, 6B) passes through a trajectory moving forward and upward around the rotation centers 4R and 4R, and the rear part is lifted upward. As a result, as shown in FIG. 4, when the seat back 2 is in a state where the seat back 2 is completely tilted backward (third angle position), the height position of the rear portion of the seat cushion 3 is the seat back 2. The seat back 2 and a fully flat seating surface can be formed.

  As described above, according to the vehicle seat 1 of the present embodiment, the second tilting posture that is easy to lean from the first angular position (position shown in FIG. 2) in which the seat back 2 is used as a backrest in a normal state. By tilting backward to the angle position (position shown in FIG. 3), the tilting posture with respect to the bases 5 and 5 on each side of the seat cushion 3 tilts in the forward upward direction. Thereby, even if the seat back 2 is tilted backward to the comfort posture, the forward sliding movement of the seated occupant with respect to the seat cushion 3 can be suitably prevented.

  As mentioned above, although embodiment of this invention was described using one Example, this invention can be implemented with various forms other than the said Example. For example, in the above-described embodiment, the base is provided so as to be integrally fixed to the floor, but the base is connected to the floor so as to be movable with respect to the floor via a slider device or a lifter. It may be a thing.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2F Back frame 2Fa Side frame 2Fa1 Extension part 2Fc Upper frame 3 Seat cushion 3F Cushion frame 3Fa Side frame 3Fc Front frame 3Fd Reinforcement frame 4 Reclining device 4A Rod 4R Rotation center 5 Base 6A Link member 6A1 Connecting pin 6A2 connecting pin 6B connecting pin

Claims (1)

A vehicle seat configured such that a seat cushion seating position changes in conjunction with a change in a seat back backrest angle,
The seat back is connected to a base that supports the seat cushion in a state in which a backrest angle can be adjusted, and the seat cushion is connected so that a front portion thereof is movable with respect to the base, and a rear portion is It is connected in a rotatable state with respect to the extension formed by extending the shape downward from the connecting part with the base of the seat back,
The front portion of the seat cushion and the base are connected to each other via a link member that is rotatably connected to the front portion and the base of the seat cushion, and the seat back is normally connected to the back of the seat cushion. Due to the backward tilting movement from the first angular position used as a heel to the second angular position, which is an easy backward tilting posture tilted backward, the connection point between the seat cushion and the seat back, the seat cushion and the The position of each connection point is set so that the connection point with the link member moves so as to incline the inclination posture of the seat cushion with respect to the base in the upward direction ,
The connection point between the rear portion of the seat cushion and the extension portion of the seat back is set to a position on the rear side of the connection point with the base when the seat back is in the first angular position. The connecting point passes through a movement locus in which the seat back is lowered in the height direction by the backward tilting movement from the first angular position to the second angular position, and the seat back is at the second angle. A vehicle seat characterized in that a tilting posture of the seat cushion with respect to the base is made to approach a horizontal posture through a moving locus that rises in the height direction with respect to a movement that further tilts backward from the position. .

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