JPH11276295A - Back rest structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back rest structure capable of supporting the shoulders of a person with tall seated height. SOLUTION: A back rest 12 consists of an upper back rest 21 and a lower back rest 22. A worm gear 33 is provided at a left/right connection frame 26 of the lower back rest 22, and a shaft 34 of the worm is projected to the side of the lower back rest 22 and an operation handle 35 is provided. A feed screw 36 is provided at the worm wheel of the worm gear 33, and a feed nut 41 screwing into the feed screw 36 is formed at a slider 39. Left and right support cylinders 44 and 45 are formed at the slider 39 to support left and right extension bars 62, 63 extending from the upper back rest 21. At the center of the upper back rest 21, a dent part 69 shown by the figure is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back structure in which a seat back is divided into upper and lower parts.

[0002]

2. Description of the Related Art FIG. 4 is a view showing a conventional seat 201, which shows a seat back structure in which a seat back 202 forming a backrest is divided into upper and lower parts (Japanese Utility Model Laid-Open No. 1-123943). Gazette).

[0003] That is, the seat back 202 is composed of an upper seat back 205 forming the upper portion of the seat back 202 and a lower seat back 206 forming the lower portion.
It is supported by the seat cushion 207. The upper seatback 205 is provided with a pair of extension bars 208, 208 extending downward, and the extension bars 208, 208 are inserted into the lower seatback 206 in a freely removable manner. Insertion holes 209, 209 are provided.

As a result, the seat back 202
The upper seat back 205 and the lower seat back 2
06 is configured so that it can be detachably divided
When the seat back 202 is reclined,
Even when the upper portion of the seat back 202 interferes with the seat cushion of the rear seat, the upper seat back 205 is removed from the lower seat back 206 in advance to prevent the rear seat from interfering with the seat cushion. Is configured to be able to be prevented.

[0005]

However, in the above-mentioned seat back structure, the extension bars 208, 208 of the upper seat back 205 are removably inserted into the insertion holes 209, 209 of the lower seat back 206. Although the upper seat back 205 can be displaced up and down, the upper seat back 205 cannot be set at a predetermined height position.

For this reason, the height of the upper seat back 205 cannot be adjusted according to the shoulder of the occupant, and the occupant having a high sitting height cannot support the shoulder. .

The present invention has been made in view of such conventional problems, and has as its object to provide a seat back structure that can support a shoulder even if a seated person has a high sitting height. Things.

[0008]

According to a first aspect of the present invention, there is provided a seat back structure, wherein a seat back forming a backrest includes an upper seat back forming an upper portion and a lower portion forming an upper portion. A pair of left and right extending bars extending downward from the upper seat back and being inserted into left and right insertion holes provided in an upper end surface of the lower seat back. A seatback structure capable of detachably dividing the lower seatback and the lower seatback, wherein the slider supports the left and right extending bars inserted into the lower seatback, and is provided vertically movable in the lower seatback. A lifting mechanism that raises and lowers the slider in response to a rotation operation of an operation handle provided on the lower seatback; The recess bottom surface of Tobakku is being retracted upwardly and formed between the left and right extension bar.

That is, when the operation handle provided on the lower seat back is rotated, the slider provided in the lower seat back is moved up and down by the elevating mechanism, and the left and right extension supported by the slider is extended. The exit bar and the upper seat back are raised and lowered.

Then, on the lower end surface of the upper seat back,
A recess recessed upward is formed between the left and right extending bars, and a gap is formed between the upper seat back and the lower seat back. Therefore, when operating the operation handle with one hand to raise the upper seat back, insert the other hand into the gap,
This can assist in raising the upper seat back.

On the other hand, the recess of the upper seat back is provided between the left and right extending bars, that is, at the center of the upper seat back, and on both sides of the recess, a shoulder support for supporting a shoulder is provided. An area is reserved.

Further, in the seat back structure according to the second aspect,
A seat back forming a backrest is constituted by an upper seat back forming an upper part and a lower seat back forming a lower part, and a pair of right and left extending bars extending downward from the upper seat back is formed by the lower seat. In a seat back structure which is inserted into left and right insertion holes provided in an upper end surface of a back and is capable of detachably dividing the upper seat back and the lower seat back, the left and right extending bars inserted into the lower seat back Are provided at left and right end portions, and extend vertically so as to be screwed into a feed nut portion formed in a central portion of the slider, which is provided vertically movably in the lower seat back. A feed screw, a rotation mechanism provided at a lower end portion of the feed screw for rotating the feed screw, and driving means for driving the rotation mechanism in accordance with a switch operation The provided, on the one lower end surface of the upper seat back to form a recess formed by retracting upward between the left and right extension bars, upper end surface of the lower seat back,
A convex portion that protrudes upward in conformity with the concave portion is formed, and a central portion of the slider on which the feed nut portion is formed is curved upward.

That is, when the switch is operated and the rotation mechanism is driven by the driving means and the feed screw is rotated, the slider having a feed nut portion with which the feed screw is screwed rotates the feed screw. It is raised and lowered according to the direction. Then, along with this, the left and right extending bars supported by the slider and the upper seat back are raised and lowered.

A concave portion is formed on a lower end surface of the upper seat back, and a convex portion protruding upward is formed on an upper end surface of the lower seat back, and the slider is provided with the feed nut portion. The central portion is curved upward. For this reason, the central part of the slider curved upward is
When it is moved downward along the feed screw, the rotating mechanism is avoided, and when it is moved upward, it can be moved into the upwardly protruding projection.

On the other hand, the concave portion of the upper seat back is provided between the left and right extending bars, that is, at the center of the upper seat back. An area is reserved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a view showing a seat 1 provided with a seat back structure according to the present embodiment. The seat 1 is provided in a vehicle. The seat 1 is a seat cushion 11 which forms a seating surface supported on a vehicle body floor. And a seat back 12 forming a backrest. On the left side of the seat cushion 11, there is provided a buckle 13 to which a tongue provided on the seat belt is detachably locked. At the rear end of the seat cushion 11, a reclining rotation shaft 14 extending in the width direction is provided, and left and right support plates 15, 16 are provided at both ends of the rotation shaft 14.

The seat back 12 includes an upper seat back 21 forming an upper portion and a lower seat back 22 forming a lower portion. The lower seat back 22 includes left and right frames 23, 24,
The rotating shaft 14 provided on the seat cushion 11
Are supported by left and right support plates 15 and 16. The left and right frames 23, 24 are provided with S springs 25,... Extending in the width direction at a portion on the front surface side of the seat back 12, and at the middle portion on the back surface side of the seat back 12, Left and right connecting frame 26 connecting 23 and 24
Is provided.

As shown in FIG. 2, a worm gear 33 having a built-in worm 31 and a worm wheel 32 meshing with the worm 31 is provided at the center of the left and right connecting frame 26. The shaft portion 34 of the worm 31 penetrates through the left frame 24 and protrudes to the side of the lower seat back 22, and an operation handle 35 is provided at the tip thereof. The worm wheel 3
2 is provided with a feed screw 36 having a thread formed on a side surface, and the feed screw 36 extends upward. Also, on the left and right sides of the left and right connecting frame 26, cylindrical left and right guide posts 3 extending upward.
7 and 38 are fixed, and the right and left guide posts 37 and 3 are fixed.
8, a slider 39 extending in the width direction is provided to be vertically movable.

The slider 39 has a feed nut 41 formed at the center thereof for screwing with the feed screw 36.
The slider 39 is configured to move up and down with the rotation of the feed screw 36. As a result, the slider 39 is attached to the lower seat back 22.
Of the feed nut portion 41 and the feed screw 36 extending from the worm gear 33 are formed. On both ends of the slider 39, left and right support cylinders 44 and 45 having circular bottomed left and right support holes 42 (only the right support hole is shown) are formed.

The upper ends of the left and right frames 23 and 24 have bent portions 51 and 5 bent toward the opposite frames.
2 are formed, and both bent portions 51 and 52 are continuously provided by an upper surface continuous plate 53. The both bent portions 51, 52
Are provided with left and right insertion holes 54 and 55, and both insertion holes 54 and 55 are provided at portions facing the left and right support holes 42 formed at both ends of the slider 39.

On the other hand, the frame of the upper seat back 21 has a headrest portion 61 forming a headrest,
Left and right extending bars 62, 63 are provided which extend obliquely downward from both sides of the headrest portion 61 and then extend downward from the upper seat back 21.
2 and 63 are removably inserted into the left and right insertion holes 54 and 55 provided on the upper end surface of the lower seat back 22 and are fitted in left and right support holes 42 formed at both ends of the slider 39. It is configured to be supported in a state where it is held. The left and right extending bars 62 and 63 are connected by a connecting member 64, and both ends of the connecting member 64 and the corners of the left and right extending bars 62 and 63 are bent at the center. Left and right hook-shaped members 65 and 66 are provided. Thus, the upper seat back 21 is formed with left and right shoulder support portions 67 and 68 for supporting the shoulder portion of the seated person, and between the shoulder support portions 67 and 68, A concave portion 69 is formed in which the lower end surface is retracted upward.

In this embodiment having the above-described structure, the slider 39 provided in the lower seat back 22 is moved up and down by rotating the operation handle 35 provided on the lower seat back 22 of the seat 1. Accordingly, the left and right extending bars 62 and 63 supported by the left and right support holes 42 of the slider 39 and the upper seat back 21 can be moved up and down. Therefore, the height position of the upper seat back 21 can be adjusted according to the shoulder of the seated person, so that the shoulder can be supported even when a seated person with a high sitting height is seated.

A concave portion 69 is formed on the lower end surface of the upper seat back 21 so as to be retracted upward.
Lower end surface of upper seat back 21 and lower seat back 22
A gap is formed between the two seat backs 21 and 22 in a state in which the upper surface of the seat back is in contact with the upper surface. Therefore, when operating the operation handle 35 with one hand to raise the upper seat back 21, the other hand can be inserted into the gap to assist in raising the upper seat back 21. Thereby, the lifting work of the upper seat back 21 becomes easy.

Further, since the recess 69 is formed between the left and right extending bars 62 and 63 inserted into the left and right insertion holes 54 and 55 of the lower seat back 22, the recess 69 is provided.
When the upper seat back 21 is raised by inserting a hand into the gap formed by the above, it is possible to prevent the upper seat back 21 from tilting left and right. Thereby, the pull-out direction of the left and right extension bars 62, 63 can be maintained perpendicular to the left and right insertion holes 54, 55, so that the left and right extension bars 62, 63 and the left and right insertion holes 54, 55 can be maintained.
And the sliding contact resistance with them can be kept small.

Since the concave portion 69 of the upper seat back 21 is provided at the center of the upper seat back 21, the area of the left and right shoulder supporting portions 67, 68 provided on both sides of the concave portion 69 is limited. It can be sufficiently secured.

(Second Embodiment) FIG. 3 is a view showing a sheet 101 according to a second embodiment of the present invention.
Only parts different from the first embodiment will be described.

That is, the left and right frames 23 and 24 of the lower seat back 22 are provided with left and right connecting frames 26 for connecting the left and right frames 23 and 24, and the center of the left and right connecting frames 26 is as shown in FIG. As shown, a worm gear 33 is provided as a rotation mechanism including a worm 31 and a worm wheel 32 that meshes with the worm 31. The shaft portion 34 of the worm 31 of the worm gear 33 has a flexible cable 1
11 is connected to the flexible cable 111
Is connected to a driving motor 112 as a driving means provided at a lower portion of the right frame 23. The drive motor 1
Reference numeral 12 is connected to a control device (not shown). The control device 12 is connected to the control device and rotates forward and backward based on the operation of a seesaw switch 113 (or a slide switch) provided on the right side of the seat cushion 11. Is configured.

The worm wheel 32 is provided with a feed screw 36 having a thread formed on a side surface.
The feed screw 36 extends upward. The feed screw 36 is provided with a slider 122 having a feed nut portion 121, which is screwed to the feed screw 36, provided at the center thereof so as to be movable up and down. Is configured to be moved in the up-down direction in accordance with.

At the center of the slider 122 on which the feed nut portion 121 is formed, a curved portion 131 which is curved upward is formed. When the slider 122 is moved downward, it is in contact with the upper end of the worm gear 33. It is configured so that interference can be avoided.

On the upper end surface of the lower seat back 22, a convex portion 141 is formed which protrudes upward in conformity with the concave portion 69 formed on the lower end surface of the upper seat back 21. , 24 are also bent upward along the projection 141. Thus, a space is provided in the convex portion 141 where the curved portion 131 of the slider 122 can enter. At both ends of the slider 122, left and right support cylinders 44 and 45 as support portions each having a bottomed circular left and right support hole 42 (only the right support hole is shown) are provided as in the first embodiment. Is provided.

In this embodiment having the above-described structure, the drive motor 1 is operated by operating the seesaw switch 113 provided on the right side of the seat cushion 11.
12. The worm gear 33 is driven by the
Is rotated, and a slider 122 having a feed nut portion 121 with which the feed screw 36 is screwed is moved up and down in accordance with the rotation direction of the feed screw 36, whereby the left and right support cylinders 44, The left and right extending bars 62, 63 supported by 45 and the upper seat back 21 can be moved up and down. Therefore, the height of the upper seat back 21 can be adjusted according to the shoulder of the occupant,
As in the first embodiment, even when a seated person with a high sitting height is seated, the shoulder can be supported.

A concave portion 69 is formed on a lower end surface of the upper seat back 21, and a convex portion 141 is formed on an upper end surface of the lower seat back 22 to protrude upward, and the feed nut portion 121 is formed. The center portion of the slider 122 thus formed is curved upward. Therefore, when the slider 122 is moved downward along the feed screw 36, interference with the upper end of the worm gear 33 can be avoided, while when the slider 122 is moved upward, it projects upward. It can be moved into the above-mentioned convex part 141. Further, since the concave portion 69 of the upper seat back 21 is provided at the center of the upper seat back 21, the concave portion 69 is provided similarly to the first embodiment.
The area of the left and right shoulder support portions 67, 68 provided on both sides of the above can be sufficiently secured.

Therefore, the slider 12 in the lower seat back 22 can be provided without reducing the area of the left and right shoulder support portions 67, 68 in the upper seat back 21.
2, the amount of movement of the upper seat back 21 can be increased, and the difference in sitting height of the seated person can be absorbed in a wider range.

[0034]

As described above, in the seat back structure according to the first aspect of the present invention, the operation handle provided on the lower seat back is rotated to operate the seat back provided in the lower seat back. The slider can be raised and lowered by the lifting mechanism, whereby the left and right extending bars and the upper seat back supported by the slider can be raised and lowered. Therefore, the height of the upper seat back can be adjusted according to the shoulder of the seated person, so that the shoulder can be supported even when a seated person with a high sitting height is seated.

A concave portion is formed on the lower end surface of the upper seat back so as to be retracted upward, and a gap is formed between the upper seat back and the lower seat back. When the operation handle is operated to raise the upper seat back, the other hand can be inserted into the gap to assist in raising the upper seat back. This facilitates the work of raising the upper seat back.

Further, since the concave portion is formed between the left and right extending bars inserted into the left and right insertion holes of the lower seat back, a hand is inserted into a gap formed by the concave portion to insert the upper seat back. When assisting the ascent of the vehicle, the inclination of the upper seat back to the left and right can be prevented.
Thereby, the pulling-out direction of the left and right extension bars can be maintained perpendicular to the left and right insertion holes, so that the sliding contact resistance between the left and right extension bars and the left and right insertion holes can be suppressed to a small value. Since the concave portion of the upper seat back is provided between the left and right extending bars, that is, at the center of the upper seat back, a shoulder supporting area for supporting a shoulder portion is secured on both sides of the concave portion. can do.

On the other hand, in the seat back structure according to the second aspect, by operating the switch, the rotating mechanism is driven by the driving means, and the feed screw is rotated.
A slider having a feed nut portion with which the feed screw is screwed is moved up and down in accordance with the rotation direction of the feed screw, thereby moving up and down the left and right extending bars and the upper seat back supported by the slider. Can be. Therefore, since the height of the upper seat back can be adjusted according to the shoulder of the seated person, the shoulder can be supported even when a seated person with a high sitting height is seated as in the case of claim 1. Can be.

A concave portion is formed on a lower end surface of the upper seat back, and a convex portion protruding upward is formed on an upper end surface of the lower seat back, and the slider is provided with the feed nut portion. The central portion is curved upward, so that when the slider is moved downward along the feed screw, interference with the rotating mechanism can be avoided, while when the slider is moved upward, It can be moved to the inside of the convex part protruding. Further, since the concave portion of the upper seat back is provided between the left and right extending bars, that is, at the center of the upper seat back, a shoulder supporting area for supporting a shoulder portion is secured on both sides of the concave portion. can do. Therefore, the amount of movement of the slider in the lower seat back, that is, the amount of movement of the upper seat back can be increased without causing a decrease in the shoulder support area in the upper seat back, and the difference in sitting height of the seated person can be reduced. Can be widely absorbed.

[0039]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing the inside of the worm gear in the embodiment.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional seat.

[Explanation of symbols]

 Reference Signs List 1 seat 12 seat back 21 upper seat back 22 lower seat back 33 worm gear (rotary mechanism) 35 operation handle 36 feed screw 39 slider 44 right support cylinder 45 left support cylinder 54 right insertion hole 55 left insertion hole 62 right extension bar 63 left Extension bar 69 Depression 101 Sheet 112 Drive motor (drive means) 113 Seesaw switch 121 Feed nut part 122 Slider 131 Curved part 141 Convex part

Claims (2)

[Claims] 1. A seat back forming a backrest is constituted by an upper seat back forming an upper portion and a lower seat back forming a lower portion, and a pair of left and right extending bars extending downward from the upper seat back. Are inserted into left and right insertion holes provided in the upper end surface of the lower seat back, and the upper seat back and the lower seat back can be detachably divided into the upper seat back and the lower seat back. A slider that supports the left and right extension bars and is provided to be vertically movable in the lower seat back, and an elevating mechanism that raises and lowers the slider in accordance with a rotation operation of an operation handle provided in the lower seat back. And a recess formed by lowering the lower end surface of the upper seat back upward is formed between the left and right extending bars. Seat back structure to the butterflies. 2. A seat back forming a backrest is constituted by an upper seat back forming an upper portion and a lower seat back forming a lower portion, and a pair of left and right extending bars extending downward from the upper seat back. Are inserted into left and right insertion holes provided in the upper end surface of the lower seat back, and the upper seat back and the lower seat back can be detachably divided into the upper seat back and the lower seat back. Support portions for supporting the left and right extending bars are provided at left and right end portions, and are screwed to a slider provided movably up and down in the lower seat back and a feed nut portion formed at a central portion of the slider. A feed screw extending vertically, a rotating mechanism provided at a lower end of the feed screw for rotating the feed screw, and a driving mechanism for driving the rotating mechanism in response to a switch operation. A lower end surface of the upper seat back is formed between the left and right extending bars while a lower end surface of the upper seat back is recessed upward, while a lower end surface of the lower seat back is adapted to the concave portion. A seat back structure, wherein a convex portion protruding upward is formed, and a center portion of the slider on which the feed nut portion is formed is curved upward.