JP6013285B2 - Seat back structure - Google Patents

Description

  The present invention relates to a seat back structure. More specifically, the present invention relates to a seat back structure that can change the seating surface shape of a seat pad provided in a seat back of a vehicle seat such as an automobile according to the back posture of the seated person.

A vehicle seat such as an automobile seat usually includes a seat cushion serving as a seat for a seated person and a seat back serving as a backrest. The seat back of the vehicle seat supports the back of the seated person. The support posture of the seated person supported by the seat back varies depending on the traveling state of the vehicle, the physique of the seated person, and the like.
For this reason, as shown in Patent Document 1 below, a seat back structure that can change the seating surface shape of a seat back pad that supports the back of the seated person in the seat back has been proposed. This reduces the accumulation of fatigue in the sitting posture state of the seated person.

Japanese Patent No. 2634539

  However, in the configuration of Patent Document 1 described above, the shape change of the seating surface of the seat back pad in the seat back is performed by a dial operation. In other words, it is necessary for the seated person to change by dial operation to adjust to an appropriate support posture state, and it is not possible to sufficiently cope with the traveling state of the vehicle in which the seater's support posture changes sequentially. It was.

  Thus, the present invention has been devised in view of the above, and the problem to be solved by the present invention is that the seat back pad is automatically adjusted in accordance with the change in the support posture of the seated person on the seat back. It is to be able to change the support shape of the seating back surface.

In order to solve the above problems, the seat back structure according to the present invention takes the following means.
The present invention provides a seat back structure in which a seating back surface shape of a seat back pad can be changed, and a seat back pad disposed with respect to a frame member forming a skeleton of the seat back is provided with respect to the frame member. The rotation support mechanism is supported so as to be rotatable around a rotation support axis set in the seat back width direction, and the rotation support mechanism is applied to the seat back pad on the back of the seated person. configuration mechanism der which rotates in response to the back shape of the seated person by contact is, the rotary support mechanism includes a shaft mounted to extend in the width direction relative to the frame member, rotating relative to the shaft member A rotation support plate member that is movably disposed, and a seat back pad is disposed and supported on the rotation support plate member, and the shaft body is disposed at a central position in the vertical direction of the seat back. The In addition, the seat back pad is divided and formed so that each of the divided parts can be deformed without being influenced by other parts. A lateral slit of the groove is formed, and the position of the lateral slit of the seat back pad and the height position at which the shaft body is disposed are the same position .

According to the present invention, the seating back surface shape of the seat back pad is rotated by the rotation support mechanism provided in the seat back according to the contact of the back surface of the seated person with the seating back surface of the seat back pad. Therefore, it is possible to automatically cope with the seating back shape corresponding to the seating posture change of the seated person. Further, when the rotation support mechanism is configured in this way, it can be configured as a relatively simple mechanical mechanism.

The above means of the present invention, have the preferred to the following form.

For example, it is preferable that a plurality of rotation support plate members of the rotation support mechanism are provided and arranged in parallel to the shaft body.
Thus, when a plurality of rotation support plate members are arranged, it is possible to meticulously cope with the seating surface shape according to the seating posture change of the seated person.

  By adopting the above-described means, the present invention can automatically change the support shape of the seat back of the seat back pad in accordance with the change in the support posture of the seat occupant.

It is a disassembled perspective view which shows the seat back structure of embodiment of this invention. It is the II-II sectional view taken on the line of FIG. It is the III-III sectional view taken on the line of FIG. It is a perspective view which shows the attachment state of a shaft body and a rotation support plate member. It is a typical perspective view which shows the arrangement | positioning modification of a rotation support plate member. It is a top view which shows the seating posture state of a seated person at the time of the vehicle (automobile) turning left. It is a rear view in FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. In this embodiment, the case of an automobile seat will be described as an example of a vehicle seat. In the following description, direction indications such as front and rear, left and right, and up and down directions are display directions when viewed from a seated person seated on the seat.

FIG. 1 is an exploded perspective view of the seat back structure of the present embodiment. An automobile seat (hereinafter sometimes simply referred to as “seat”) 10 generally includes a seat cushion serving as a seat for a seated person and a seat back 12 serving as a backrest. The seat back 12 is arranged in a standing state at a rear position of the seat cushion, and supports the back surface of the seated person when the seated person sits on the seat 10. In FIG. 1, the illustration of the seat cushion is omitted.
The seat back 12 has a skeleton formed by the frame member 14. The frame member 14 includes an upper frame 14A, a side frame 14B, and a lower panel 14C. The upper frame 14A is formed in an inverted U shape by bending a pipe, and is disposed at an upper position. The side frame 14B is formed in a plate shape with a flange, and is connected and connected to lower positions on both sides of the inverted U-shaped upper frame 14A by welding or the like. The lower panel 14C is arranged in a state of bridging between the lower positions of the side frames 14B and 14B arranged on the left and right sides. Thereby, the frame member 14 is configured as a frame shape as a whole, and forms a skeleton of the seat back 12. Note that the connecting rod 16 is disposed in parallel with the lower panel 14C as viewed in FIG. 1, and is disposed between the lower positions of the side frames 14B and 14B on both sides, like the lower panel 14C. For this reason, the connecting rod 16 also serves as the frame member 14 and also functions as a rotating shaft when the seat back 12 includes a reclining mechanism. The connecting rod 16 is disposed at the front position of the lower panel 14C.

A seat back pad 18 is disposed at the front position of the frame member 14. The seat back pad 18 includes a top plate portion seat back pad 20 at a central position, and a frame seat back pad 22 disposed so as to surround the top plate portion seat back pad 20.
The top plate seat back pad 20 is a portion that supports the back of the seat occupant by contacting the back of the seat occupant when the seat occupant is seated, and is disposed at a front position substantially at the center of the seat back 12. In this embodiment, the four parts divided into upper, lower, left and right are integrally formed and arranged. A horizontal slit 24 and a vertical slit 26 are provided so that each of the four parts can be deformed without being affected by other parts. The horizontal slit 24 is formed by forming a concave groove on the front surface at the center position in the vertical direction of the top plate portion seat back pad 20. The vertical slit 26 is formed at a substantially center position in the left-right direction indicated by a dotted line in FIG. In addition, you may arrange | position the horizontal slit 24 and the vertical slit 26 provided in order to divide | segment into these four parts of the upper and lower sides, and right and left as a completely isolate | separated part as a cutting state. However, from the viewpoint of convenience in handling the top plate portion seat back pad 20, it is preferable to form the four portions in an integrated state for convenience of handling as a single component.
The frame seat back pad 22 is disposed on the front surface of the frame member 14 so as to cover the upper frame 14A and the side frame 14B of the frame member 14. Therefore, the frame seat back pad 22 includes an upper seat back pad 22A that covers the upper frame 14A and a side seat back pad 22B that covers the side frame 14B. The side seat back pads 22B on both sides are generally arranged in a form protruding forward from the seating surface of the top plate seat back pad 20, and hold the lateral movement of the seated person that occurs during turning of the vehicle. I am doing so.
In addition, the lower part of the top plate portion seat back pad 20 and the side seat back pad 22B is arranged in a state of being wound around the connecting rod 16 as shown in FIG.

A rotation support mechanism 28 is provided at the rear surface position of the seat back pad 18. The rotation support mechanism 28 includes a rotation support plate member 30 and a shaft body 31 as main components. As shown in FIG. 2, the shaft body 31 is fixed to the left and right side frames 14B and 14B, and is disposed horizontally across the both sides 14B and 14B. That is, the shaft body 31 is disposed so as to extend in the width direction with respect to the seat back 12. Note that both ends of the shaft body 31 are supported through the side frame 14 </ b> B and stopped by the E-ring 40.
The rotation support plate member 30 is formed of a long and rigid body plate member. In this embodiment, as shown in FIG. Arranged and rotatably mounted. Details of the mounting configuration are shown in FIG. The rotation support plate member 30 has a Ω-shaped bracket 32 attached to the back surface at the intermediate position in the longitudinal direction as viewed in a longitudinal section. That is, the rotation support plate member 30 is attached to the shaft body 31 as a rotation support shaft so as to be swingable in the front-rear direction around the rotation support shaft.
As shown in FIGS. 2 and 3, the top plate seat back pad 20 is attached to the front surface of the rotation support plate member 30 by bonding or the like. The upper and lower parts on the right side of the top plate seat back pad 20 are attached to a rotation support plate member 30 arranged on the right side, and the upper and lower parts on the left side are attached to the rotation support plate member 30 arranged on the left side. The position of the horizontal slit 24 of the top plate seat back pad 20 and the height position at which the shaft body 31 is disposed are substantially the same position. Therefore, the upper part and the lower part of the top plate seat back pad 20 are reversed. That is, when the upper part of the top plate portion seat back pad 20 rotates forward about the shaft body 31, the lower part rotates rearward. Further, the vertical slit 26 of the top plate portion seat back pad 20 is disposed so as to be between the two rotation support plate members 30, 30 arranged in parallel. Therefore, the right and left portions of the top plate seat back pad 20 can be rotated even when the right and left rotation support plate members 30 rotate differently.

  A spring member 36 is disposed between the lower position of the rotation support plate member 30 and the lower panel 14C, and a neutral position setting mechanism 34 of the rotation support plate member 30 is configured. As shown in FIG. 3, the neutral position setting mechanism 34 has an L-shaped bracket 38 fixed to the lower position of the rotary support plate member 30 as viewed in a longitudinal section, and is attached to the L-shaped bracket 38. The spring member 36 is latched between the latching hole drilled and the latching hole drilled in the lower panel 14C. The neutral position setting mechanism 34 is configured and arranged so that the arrangement state of the top plate seat back pad 20 is also in the basic position state when the spring member 36 is attached in a free state. The spring member 36 is biased in the front-rear direction with respect to the seat back 12. Accordingly, when the seat 10 is not seated, no external force is applied to the neutral position setting mechanism 34. Therefore, the spring member 36 is in a free state, and the position of the rotary support plate member 30 is also in the basic position state. Now, when a support load is applied to the top plate seat back pad 20 and the lower part of the rotary support plate member 30 rotates backward, the spring member 36 is in a compressed state, and the rotary support plate member 30 is brought into the basic position state. A spring force to return is generated. On the contrary, when the rotation support plate member 30 is rotated forward by the support load of the seated person, the spring member 36 is pulled, and a spring force is generated to return the rotation support plate member 30 to the basic position.

Next, the effect | action which changes a support state corresponding to the behavior change of the back part in the seated state of the seated person in the seat back structure of the said embodiment is demonstrated.
When the sitting posture of the seated person's back is relatively the upper part of the seated person's back is in the rear position and the lower part is in the forward position, the rotation support mechanism 28 corresponds to the posture position state of the seated person's back. The seat back pad 20 is rotated. That is, the two rotation support plate members 30 and 30 arranged in parallel are both rotated in the clockwise direction as viewed in FIG. The upper part of the back pad 20 is set to a relatively rear position, and the lower part is set to a relatively front position, so that the support state corresponding to the sitting posture of the seated person is automatically changed. In this state, the spring member 36 of the neutral position setting mechanism 34 is in the tension spring state, and the seating support state on the seat back 12 is released, whereby the rotation support mechanism 28 is brought into the basic position state by the tension spring force. Returned.
Next, when the seating posture of the back of the seated person is different between the right part and the left part, the two rotation support plate members 30 arranged in parallel operate differently. For example, when the position of the shoulder of the upper position of the seated person's back is the right shoulder is relatively forward and the left shoulder is relatively backward, as shown in FIG. The plate member 30 is rotated in the counterclockwise rotation direction, and the left-side rotation support plate member 30 is rotated in the clockwise rotation direction, and automatically becomes a support state corresponding to the seating posture of the seated person. In this state, the spring member 36 of the neutral position setting mechanism 34 of the rotation support plate member 30 disposed on the right side is in a compression spring state, and the spring of the neutral position setting mechanism 34 of the rotation support plate member 30 disposed on the left side. Although the member 36 is in the tension spring state, when the seating support state on the seat back 12 is released, the rotation support mechanism 28 is returned to the basic position state by these spring forces.
In the present embodiment, the top plate seat back pad 20 is divided into four parts by the horizontal slits 24 and the vertical slits 26, so that each can be separately deformed, and the posture of the back of the seated person can be changed. It is easy to correspond.

6 and 7 show the posture state of the seated person M in the left turn running state of the automobile. FIG. 6 shows a posture state when the seated person M is viewed from above, and FIG. 7 shows a posture state when the seated person M is viewed from the back. 6 and 7, X indicates the left and right shoulder lines in the left turn state, and Y indicates the waist line in the same state. As can be seen from these figures, in the left turn state, the positions of the left and right shoulders, which are the positions of the upper part of the back of the seated person M, are the front position of the right shoulder and the position of the left shoulder relatively backward. Position. In the same state, the position of the lower back of the seated person M is such that the position of the right waist is a relatively rear position and the position of the left waist is a relatively forward position.
The rotation support plate member 30 located on the right side among the rotation support plate members 30 arranged in parallel according to the posture state of the seated person M in the left turn traveling state as described above is shown in FIG. According to the positional relationship between the shoulder and the right lumbar region, the seating person rotates in the counterclockwise direction, with the upper part of the top plate seat back pad 20 as a relatively front position and the lower part as a relatively rear position. It supports as a support state according to the posture at the time of turning.
Further, as shown in FIG. 3, the rotation support plate member 30 located on the left side rotates in the clockwise rotation direction depending on the positional relationship between the left shoulder of the seated person M and the left waist portion, and the upper part of the top plate seat back pad 20. The part is set to a relatively rear position, and the lower part is set to a relatively front position, and is supported as a support state corresponding to the posture of the seated person M during turning.
In the right-turning state of the automobile, the movements are performed in reverse.
As described above, in the present embodiment, even when the posture change of the seated person M is sequentially performed in the running state of the automobile, the support state of the seat back 12 by the seat back pad 18 is automatically changed corresponding to the posture change. Therefore, it is possible to reduce the accumulation of fatigue due to sitting while the automobile is running.

As mentioned above, although embodiment of this invention was described, this invention can be implemented with various forms other than the said embodiment.
For example, the number of the rotation support plate members 30 constituting the rotation support mechanism 28 is two in the above embodiment, but may be one, or may be three or more. By increasing the number, it is possible to cope with changes in the posture of the back of the seated person finely.
Moreover, in the said embodiment, although it was a case where the two rotation support plate members 30 were arranged in parallel, as shown in a modification typically in FIG. 5, the two rotation support plate members 30 are shaft bodies. It may be arranged and configured to cross in X shape at 31 locations. In the case of such a cross arrangement, for example, it is possible to support the entire right side of the seated person as the front position and the entire left side as the rear position.

10 Automotive seats (vehicle seats)
DESCRIPTION OF SYMBOLS 12 Seat back 14 Frame member 14A Upper frame 14B Side frame 14C Lower panel 16 Connecting rod 18 Seat back pad 20 Top plate part seat back pad 22 Frame body seat back pad 22A Upper seat back pad 22B Side seat back pad 24 Horizontal slit 26 Vertical slit 28 Rotation Support Mechanism 30 Rotation Support Plate Member 31 Shaft Body 32 Bracket 34 Neutral Position Setting Mechanism 36 Spring Member 38 L-Shaped Bracket 40 E Ring

Claims (2)

A seat back structure in which the seating back shape of the seat back pad can be changed,
The seat back pad disposed on the frame member forming the skeleton of the seat back extends around the rotation support axis set in the seat back width direction in the rotation support mechanism disposed on the frame member. in which is rotatably supported, the rotary support mechanism Ri configuration mechanism der which rotates in response to the back shape of the seated person by the abutment of the rear of the seat back pad of the seated person,
The rotation support mechanism includes a shaft body that is attached to the frame member so as to extend in the width direction, and a rotation support plate member that is rotatably arranged with respect to the shaft body. The seat back pad is arranged and supported,
The shaft body is disposed at a central position in the vertical direction of the seat back, and the seat back pad is formed by being divided, and each divided portion is deformed without being influenced by other portions. In order to be able to do so, a horizontal slit of a concave groove is formed on the front surface at the center position in the vertical direction of the seat back pad, and the position of the horizontal slit of the seat back pad is the same as the height position where the shaft body is disposed. A seat back structure characterized by being positioned . The seat back structure according to claim 1,
A seat back structure comprising a plurality of rotation support plate members of the rotation support mechanism and arranged in parallel with the shaft body .

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