JP5633175B2 - Sheet device - Google Patents

Description

  The present invention relates to a seat device in which a seat back is divided into a lower seat back and an upper seat back.

  For example, in order to make the sitting posture comfortable according to the physique and preference of the person sitting on the seat, the seat back is divided into two parts, a lower seat back and an upper seat back, and the lower seat back is angled with respect to the seat cushion There has been proposed a seat device that can be set and the angle of the upper seat cushion can also be set with respect to the seat cushion (for example, described in Patent Document 1).

JP 2004-81355 A

  However, in the seat device described in Patent Document 1, since the lower seat back and the upper seat back are independently rotated with respect to the seat cushion, the back seat surface of the lower seat back and the back seat surface of the upper seat back There is a step in the front-rear direction. Therefore, a person sitting on the seat feels uncomfortable when the back part contacts the step and cannot obtain a comfortable sitting posture.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a comfortable sitting posture for a person sitting on the seat without causing a step between the backrest surfaces of the lower seat back and the upper seat back. An object of the present invention is to provide a seat device that can be in a stable state.

In the seat device of the present invention, a protruding portion that protrudes from one seat back toward the other seat back is provided on one of the lower seat back and the upper seat back having a two-part structure. Then, with this protrusion in contact with the other seat back, the contact point of that protrusion is the middle folding point of both seat backs while maintaining the backrest surface of both seat backs in a continuous state with respect to the lower seat back. Te is tilted upper seat back, when the upper seat back is tilted, you configured step does not occur between the backrest surface and the backrest surface of the lower seat back of the upper seat back.

  According to the seat device according to the present invention, a protrusion that protrudes from one of the seat backs toward the other seat back is provided on the back surface side, and the protrusion is in contact with the other seat back, When the upper seat back is tilted with respect to the lower seat back while keeping the backrest surfaces of both seat backs continuous with the contact point of the projection as the middle break point, the state where the projection contacts the other seat back The upper seat back is tilted with respect to the lower seat back, and no gap is generated between the back surface of the upper seat back and the back surface of the lower seat back. As a result, a comfortable seating posture for a person seated on the seat can be ensured by the continuous backrest surface of the lower seat back and the upper seat back.

FIG. 1 is a perspective view showing the seat device of the first embodiment. FIG. 2 is a schematic diagram illustrating the seat device according to the first embodiment, showing a pre-sitting state in which the upper seat back is not tilted with respect to the lower seat back. FIG. 3 is a schematic diagram illustrating the seat device according to the first embodiment, in which the upper seatback is tilted forward with respect to the lower seatback. FIG. 4 is a schematic view showing an example in which both the backrest surfaces of the lower seatback and the upper seatback are continuously curved in the seat device of the first embodiment. FIG. 5 is a schematic view showing the seat device of the second embodiment, in which the upper seat back is tilted forward with respect to the lower seat back.

[First Embodiment]
As shown in FIGS. 1 to 3, the seat device according to the first embodiment includes an upper seat that tilts in a forward direction X and a backward direction Y about a lower seat back 1 and a rotation shaft 2 provided in the lower seat back 1. A seat back 4 having a two-part structure composed of a back 3 and a seat cushion 5 are provided. 1st Embodiment is an example which applied this invention to the seat apparatus for motor vehicles. Of course, the present invention can also be applied to seat devices other than automobiles.

  The seat cushion 5 is attached to the vehicle floor via a seat position adjusting mechanism (not shown) having a slide and lifter function.

  The seat back 4 includes a lower seat back 1 that is pivotably attached to the rear of the seat cushion 5 and an upper seat back 3 that is tiltable to an upper portion of the lower seat back 1.

  The upper seat back 3 is tiltable in the front-rear direction around a rotation shaft 2 provided at the upper end of a seat side frame (not shown) installed inside the lower seat back 1. And the upper side projection part 6 which is a projection part which protrudes toward the lower seat back 1 is provided in the lower part of this upper seat back 3 in the backrest surface 7A side. In addition, an upper side recess 9 that is recessed according to the shape of a lower side protrusion 8 that is a protrusion described later provided on the upper part of the lower seat back 1 is provided on the lower surface of the upper seat back 3 on the back surface 10A side. ing. The backrest surface 7 </ b> A defined here indicates the backrest surface of the upper seat back 3, and the back surface 10 </ b> A indicates the back surface of the upper seat back 3.

  In the upper part of the lower seat back 1, a lower concave portion 11 is provided on the back surface 7B side, which is recessed according to the shape of the upper projection 6 of the upper seat back 3. Further, on the upper side of the lower seat back 1, a lower side protruding portion 8 which is a protruding portion protruding toward the upper seat back 3 is provided on the back side 10B. The backrest surface 7 </ b> B defined here refers to the backrest surface of the lower seat back 1, and the back surface 10 </ b> B refers to the back surface of the lower seat back 1.

  In a state where the seat is not seated (for example, when the occupant opens the door and gets into the vehicle interior, or when the back of the occupant seated on the seat cushion 5 is not in contact with the seat back 4), it is shown in FIG. As described above, the upper projection 6 fits into the lower recess 11 and the lower projection 8 fits into the upper recess 9 so that both the backrest surfaces 7A and 7B of the lower seat back 1 and the upper seat back 3 are fitted. And back surface 10A, 10B is made into the continuous linear form.

  In the seat device configured as described above, when the occupant sits down on the seat back 5 and leans his back against the seat back 4, the upper seat back 3 is moved forwardly as indicated by the arrow X in FIG. Begin to tilt. At this time, the upper seat back 3 is in contact with the lower recess 11 of the upper projection 6 in a state where the upper projection 6 is in contact with the bottom of the lower recess 11 with respect to the lower seat back 1. The upper seat back 3 tilts with respect to the lower seat back 1 while maintaining the continuous state of the backrest surfaces 7A and 7B of the seat backs 1 and 3 with the contact point P as the middle folding point of the seat back 4.

  During the tilting operation of the upper seat back 3 with respect to the lower seat back 1, the upper projection 6 is in contact with the bottom of the lower recess 11, and the upper seat back 3 is in the lower part with the contact point P as a middle break point. Since it is inclined with respect to the seat back 1, there is no step between the backrest surface 7 </ b> B of the lower seatback 1 and the backrest surface 7 </ b> A of the upper seatback 3. Further, on the back surface of the seat back 4, when the upper seat back 3 tilts forward, if there is no lower side protrusion 8, the upper side concave portion 9 is exposed and the appearance is deteriorated. However, in the first embodiment, as shown in FIG. 3, since the lower projection 8 is positioned so as to hide the upper recess 9 even when the upper seat back 3 tilts forward, there is a space on the back of the seat back. Does not occur and does not look bad.

  In FIG. 2, when both the backrest surfaces 7A and 7B of the lower seatback 1 and the upper seatback 3 and the back surfaces 10A and 10B of the both seatbacks 1 and 3 are not in contact with the seatback 4 Both were continuous and linear. On the other hand, in order to make the seated state of the occupant more comfortable, as shown in FIG. 4, both the backrest surfaces 7 </ b> A and 7 </ b> B of the lower seat back 1 and the upper seat back 3 In the case where the seat back 4 is not in contact, both may be continuously curved.

  According to the seat device of the first embodiment, the upper projection 6 projecting from the upper seatback 3 toward the lower seatback 1 is provided on the backrest surface 7A side, and the upper projection 6 is provided on the lower seatback 1. The lower seat back 1 while keeping the backrest surfaces 7A and 7B of the both seat backs 1 and 3 in a continuous state with the contact point P of the upper projection 6 as a middle break point in a state of being in contact with the bottom of the lower recess 11 The upper seat back 3 tilts with respect to the lower seat back 1 while maintaining the state in which the upper side projection 6 is in contact with the lower seat back 1. Therefore, no gap is generated between the backrest surface 7A of the upper seatback 3 and the backrest surface 7B of the lower seatback 1. As a result, the lower seat back 1 and the upper seat back 3 follow the back of the occupant seated on the seat by the continuous backrest surfaces 7A and 7B having no steps, so that the occupant is in a comfortable posture without giving a sense of discomfort to the occupant. Can be seated on the seat.

  In the seat device according to the first embodiment, for example, by setting the middle folding point of the seat back 4 that is the contact point P so as to be an optimal middle folding position for the bending operation of the human spine, A comfortable folding posture can be provided to the occupant without depending on the frame movable structure. As a result, it is possible to provide a seating posture with less burden on the occupant.

  Further, according to the seat device of the first embodiment, the upper side protrusion 6 that protrudes toward the lower seat back 1 is provided at the lower portion of the upper seat back 3, while the lower side that protrudes toward the upper seat back 3. Since the protrusion 8 is provided on the back side of the lower seat back 1, when the upper seat back 3 tilts forward to support the back of the person sitting, the lower seat protrusion 3 prevents the upper seat back 3. The rearward protrusion is suppressed, and the rear space of the upper seat back 3 can be suppressed from being narrowed.

  Further, according to the seat device of the first embodiment, both the backrest surfaces 7A and 7B of the lower seatback 1 and the upper seatback 3 and the back surfaces 10A and 10B of the both seatbacks 1 and 3 are seated on the back of the seated person. When both are not in contact with the back 4, both are continuous straight lines, so that the appearance of the seat when not sitting on the seat can be improved.

  Further, according to the seat device of the first embodiment, both the backrest surfaces 7A and 7B of the lower seatback 1 and the upper seatback 3 are continuous when the seated person's back is not in contact with the seatback 4. Therefore, the seating posture becomes more comfortable by the curved backrest surfaces 7A and 7B according to the shape of the human spine.

[Second Embodiment]
In the seat device of the second embodiment, as shown in FIG. 5, a lower side protrusion 8 that protrudes from the lower seat back 1 toward the upper seat back 3 is provided on the backrest surface 7 </ b> B side of the lower seat back 1. Yes. On the other hand, an upper protrusion 6 that protrudes from the upper seat back 3 toward the lower seat back 1 is provided on the back surface 10 </ b> A side of the upper seat back 3.

  In addition, an upper-side concave portion 9 that is recessed according to the shape of the lower-side protrusion 8 is provided on the lower side of the backrest surface 7A. On the other hand, in the upper part of the lower seat back 1, a lower side recess 11 is provided on the back surface 10B side, which is recessed in accordance with the shape of the upper side protrusion 6.

  In the seat device of the second embodiment, as in the first embodiment, when the occupant sits down on the seat back 5 and leans the back against the seat back 4, the upper seat back 3 is shown with the rotation shaft 2 as the center. 5 Tilt forward as indicated by arrow X. At this time, the upper seat back 3 is in contact with the upper recess 9 of the lower projection 8 with the lower projection 8 in contact with the bottom of the upper recess 9 with respect to the lower seat back 1. The upper seat back 3 tilts with respect to the lower seat back 1 while maintaining the continuous state of the backrest surfaces 7A and 7B of the seat backs 1 and 3 with the contact point P as the middle folding point of the seat back 4.

  During the tilting operation of the upper seat back 3 with respect to the lower seat back 1, the lower projection 8 comes into contact with the bottom of the upper recess 9, and the upper seat back 3 is in the lower part with the contact point P as a middle break point. Since it is inclined with respect to the seat back 1, there is no step between the backrest surface 7 </ b> B of the lower seatback 1 and the backrest surface 7 </ b> A of the upper seatback 3. Further, on the back surface of the seat back 4, when the upper seat back 3 tilts forward, if there is no upper side protrusion 6, the lower side recess 11 is exposed and the appearance is poor. However, in the second embodiment, as shown in FIG. 5, since the upper protrusion 6 is positioned so as to hide the lower recess 11 even when the upper seat back 3 tilts forward, there is a space on the back of the seat back. Does not occur and does not look bad.

  According to the seat device of the second embodiment, similarly to the first embodiment, the lower seat back 1 and the upper seat back 3 follow the back of the occupant seated on the seat by the continuous backrest surfaces 7A and 7B having no step. The occupant can be seated in a comfortable posture without giving a sense of incongruity to the occupant.

  INDUSTRIAL APPLICABILITY The present invention can be used for a seat device having a two-part structure in which a seat back is divided into a lower seat back and an upper seat back.

1 ... Lower seat back (seat back)
2 ... Rotating shaft 3 ... Upper seat back (seat back)
4 ... Seat back 5 ... Seat cushion 6 ... Upper side protrusion (protrusion)
7A, 7B ... Backrest surface 8 ... Lower projection (projection)
9 ... Upper side recess 10A, 10B ... Back side 11 ... Lower side recess

Claims (4)

In a seat device comprising a seat back having a two-part structure comprising a lower seat back and an upper seat back that tilts in the front-rear direction about a rotation axis provided on the lower seat back, and a seat cushion,
One of the lower seatback and the upper seatback is provided with a projection on the backrest side that projects from one seatback toward the other seatback, and the projection is brought into contact with the other seatback. In the state, the upper seat back is configured to be freely tiltable with respect to the lower seat back while keeping the backrest surfaces of the both seat backs continuous with the contact point of the protrusion as the middle folding point of both seat backs , A seat apparatus configured such that no step is generated between a backrest surface of the upper seatback and a backrest surface of the lower seatback when the upper seatback is tilted . The seat device according to claim 1,
While providing a projecting portion projecting toward the lower seat back on the back surface side at the lower part of the upper seat back,
The seat device according to claim 1, wherein a protrusion projecting toward the upper seat back is provided on the back side of the lower seat back. The seat device according to claim 1 or 2,
The seat apparatus characterized in that both the backrest surfaces of the lower seatback and the upper seatback and the back surfaces of the two seatbacks are continuous and continuous when the back of the seated person is not in contact with the seatback. . The seat device according to claim 1 or 2,
Both the backrest surfaces of the lower seat back and the upper seat back are continuously curved when the back of the person sitting is not in contact with the seat back.

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