JPH1191586A - Variable mechanism of side plate of seating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accomodate the left and right side plates between the left and right armrests when a back plate is folded to a seat plate side, by enlarging and reducing a width between the both side plates of a seating device by the elastic force of an elastic member, and to ensure a seating space by expanding the left and right side plates when the back plate is standed. SOLUTION: The side plates 4 are expanded in a condition that a back plate is stood by the elastic force of the springs 9 of the pivots 7 for expanding, and are kept in an upright state by the locking action of the washers 23 of the pivots 8 for limiting the expansion. Further when the back plate is folded to a seat plate side, a head part protection plate 6 is straightly standed along the back plate, and the side plates 4 kept into contact with the insides of the armrests, are pressed, the upper parts of the side plates 4 are inclined on the screws 28 at the lower part of the side plates 4, against the elastic force of the springs 9, whereby the expanding width of the side plates 4 at both sides can be reduced. Whereby the seating space can be widely taken when the back plate is standed, and the side plates 4 can be accomodated even when a gap between the armrests is narrower than a gap between the side plates 4, when the back plate is folded to the seat plate side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seating device, for example, a seating device in which side plates are provided on the left and right sides of a back plate pivotally attached to a seat plate of a stroller, and the side plates on both sides can be widened. The present invention relates to a side plate variable mechanism.

[0002]

2. Description of the Related Art The structure of a conventional folding stroller is shown in FIG.
It is shown in FIG.

In the stroller shown in this figure, the upper end of a front leg 40 and the upper end of a rear leg 41 are pivotally mounted near the front end of an armrest 42,
The rear end of the armrest 42 is pivotally attached to an upper portion of a connecting rod 42a that is raised upward from the middle of the rear leg 41 to form a frame.
The lower end surface of the connecting rod 42a is in contact with an appropriate position of the connecting rod 42a, and the pushing rod 45 pivotally provided at the lower end of the connecting rod 42a is capable of falling down in the front-rear direction. Note that FIG.
Is in a state of being tilted forward.

A rear end of a seat plate 46 pivotally attached to an appropriate position of the front leg 40 is pivotally attached to the front of a bracket 44 pivotally attached to the rear leg 41, and is also pivotally attached to a lower end of a connecting rod 42a. I am trying to.

Further, a back plate 47 is pivotally attached to the rear end of the seat plate 46 so as to be freely foldable, and a head protection plate 48 is pivotally attached to the upper end of the back plate 47.

A guide plate 49 having a sliding hole 49a is provided in parallel on the back surface of the back plate 47, and a lower end of both sides of an inverted U-shaped support rod 51 is connected to a connecting rod 42a pivotally attached at the rear end of the armrest 42. The part is pivotally supported by the pivot hole 50 of the connecting rod 42a, and the horizontal rod 52 of the supporting rod 51 is inserted into the sliding hole 49a. Then, as shown in FIG. 13, a plurality of fitting grooves 5 provided between the guide plates 49, 49 are provided.
By locking the left and right locking rods 54a, 54a of the stopper 54 mounted on the horizontal rod 52 in the desired grooves 3 and 53, the back plate 47 is fixed in a state where the back plate 47 is tilted to a desired inclination angle. ing.

On both sides of the back plate 47, side plates 55, 55 are provided.
Is provided. A pivot hole 56 is formed in the lower portion of the side plate 55, and a pivot 50a provided on the connecting rod 42a is inserted into the pivot hole 56 of the side plate 55 as shown in FIG.

On the other hand, as shown in FIG. 13, an insertion hole 57 is provided above the side plate 55 and an arc-shaped guide hole 58 is provided slightly above the insertion hole 57. The lower pivot 60 provided is inserted into the insertion hole 57 of the side plate 55, and the guide shaft 61 projecting above the pivot 60 is connected to the guide hole 5 of the side plate 55.
8 is inserted. The end of the guide shaft 61 is fixed with a screw 63 via a washer 62, and in this state, the side plate 55 is prevented from moving left and right.

With such a configuration, as shown in FIG. 14, the back plate 47 is pivoted forward or laid back, so that the lower plate 47 is pivotally connected to the lower pivot hole 56 and the upper guide hole 58 of the side plate 55. A square link mechanism is formed between the mounted guide shaft 61, the pivot 60 pivotally attached to the insertion hole 57, and the connection shaft 50 pivotally supporting the lower ends on both sides of the support rod 51, and thereby, each other. When the guide shaft 61 of the head protection plate 48 moves along the arc-shaped guide hole 58 of the side plate 55, the head protection plate 48 pivotally attaches to the back plate 47. The inclination angle is changed around the position A.

[0010]

However, in such a stroller, cushioning members (not shown) are provided on the seat plate 46, the back plate 47 and the head protection plate 48, and the armrests 4 are provided.
It is necessary to provide a cushion material also on the second and side plates 55, and the distance between the left and right side plates 55, 55 is largely controlled by the distance between the left and right armrests 42, 42 depending on the thickness of the cushion material.

In such a seating device, the back plate 47
Are folded to the side of the seat plate 46, the left and right side plates 55, 55
Need to be stored inside the left and right armrests 42, 42,
Considering the width of the cushion material, the left and right side plates 5
The interval between 5, 55 is largely regulated by the width of the left and right armrests 42, 42.

On the other hand, if the space between the side plates 55, 55 on both sides is widened in order to increase the seating space, it is necessary to widen the space between the armrests 42, 42 on both sides, and the whole stroller becomes large. However, in consideration of the convenience of passing through a narrow sidewalk or folding and storing, it is desirable to increase the seating space without increasing the size of the stroller.

The present invention has been made in view of such circumstances, and the distance between the side plates provided on both sides of the back plate is made freely expandable and contractable so that when the back plate is folded to the seat plate side, the left and right sides are folded. To provide a variable mechanism of a side plate of a seating device in which a side plate is stored between left and right armrests, and when the back plate is raised, the left and right side plates can be expanded to secure a large seating space. With the goal.

[0014]

In order to achieve the above object, a variable mechanism of a side plate of a seating apparatus according to the present invention comprises folding a back plate pivotally attached to a rear end of the seat plate to the seat plate side. In a seating device in which side plates provided along both sides of the back plate are accommodated inside armrests provided above both sides of the seat plate, the width between the two side plates is expanded and contracted by the elastic force of an elastic member. An expansion / contraction means is provided.

[0015] The expansion and contraction means may be provided above the side plate.

Further, the expansion and contraction means may be provided at an upper portion and a lower portion of the side plate.

[0017] The expanding / contracting means may further comprise: an expanding pivot provided with an elastic member protruding from an upper side of the back plate, and the expanding pivot may be inserted into an insertion hole formed at an upper portion of the side plate. Then, the elastic member is locked in a state of being urged outward, and an insertion hole formed in a lower portion of the side plate is protruded from a lower side portion of the back plate or a side portion of a lower standing piece. By pivotally attaching to the support shaft, the side plate is expanded by an elastic member in a state where the back plate is raised, and the side plate is pushed by the armrest in a state where the back plate is folded, thereby reducing the expansion width. You may make it.

[0018] The expansion / contraction means may further include an expansion pivot shaft having an elastic member mounted on a side portion of the head protection plate pivotally attached to an upper end of the back plate, and an insertion hole formed in an upper portion of the side plate. The expansion pivot is inserted into and fixed to the elastic member in a state where the elastic member is urged outward, and is separated slightly upward from the expansion pivot projected on the head protection plate. And an extension-restricting pivot is protruded, and the extension-restricting pivot is inserted into an arc-shaped guide hole formed slightly above the insertion hole of the side plate. While being locked by the portion, the insertion hole formed in the lower part of the side plate is pivotally attached to a support shaft protruding at a predetermined position of a connecting rod pivotally attached to the armrest, so that the back plate is raised. The side plate is expanded by an elastic member, and the side plate is pushed by the armrest in a state where the back plate is folded, thereby reducing the expansion width. It may be.

Further, the expansion / contraction means enables the side plate to be bent by a hinge provided along the longitudinal direction of the side plate, and the elastic member for returning the side plate from the bent state to the flat state and the side plate stand upright. It may be configured to include a stopper that stops in a state.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the vicinity of a back plate of a seating device according to the present invention. FIG. 2 is a perspective view of the upper mounting portion of the side plate according to the present invention, showing an expanded state. FIG. 3 is a perspective view of the upper mounting portion of the side plate according to the present invention, showing a state in which the side plate is tilted inward. FIG. 4 is a cross-sectional view of the upper mounting portion of the side plate according to the present invention, showing an expanded state. FIG.
FIG. 3 is a cross-sectional view of the upper mounting portion of the side plate according to the present invention,
This shows a state in which it has moved inward. FIG. 6 is a perspective view showing another embodiment of the present invention, showing the periphery of one side plate of the seating device. 7 (a) and 7 (b) are cross-sectional views of another embodiment of the present invention, showing the side plate in an upright state and a down state. Fig. 8 (a) and
(b) is a sectional view showing another embodiment of the expanding pivot according to the present invention. FIGS. 9 (a) and 9 (b) are perspective views showing the vicinity of a back plate of a seating device according to another embodiment of the present invention. FIG.
FIG. 7 is a perspective view of an upper mounting portion of a side plate according to another embodiment of the present invention, showing an expanded state. FIG. 11 is a perspective view of an upper mounting portion of a side plate according to another embodiment of the present invention, showing a state in which the side plate has moved inward.

When the present invention is applied to a stroller seating device, as shown in FIG. 1, a back plate 3 pivotally attached to the rear end of the seat plate 2 is folded toward the seat plate 2 so as to be positioned on both sides of the back plate 3. The seating device is configured such that the side plates 4, 4 provided alongside the armrests 5, 5 provided above both sides of the seat plate 2 are accommodated.

In such a configuration, the back plate 3 is seated by connecting and pivoting the concave and convex portions 20 formed on the rear end of the seat plate 2 and the lower end of the back plate 3 with stay bars (not shown). It is possible to fold it to the board 2 side and raise it backward.

As shown in FIG. 4, a protruding shaft 6b at the side of the convex portion 6a formed at the lower end of the head protection plate 6 is inserted into an insertion hole 3a formed inside the upper end of the back plate 3. Thereby, the head protection plate 6 is rotatable with respect to the back plate 3.

In this embodiment, the expansion pivot 7 is projected below the side portions on both sides of the head protection plate 6 and is slightly apart from the pivot 7 to limit the expansion. 8 is protruded.

As shown in FIG. 4, a holding cylinder 10 is formed on the outer periphery of the expanding pivot 7 with a gap for inserting a spring 9 therebetween. The projecting portion of the spring 9 which is shorter than the pivot 7 and inserted into the holding cylinder 10 can be compressed.

An expansion restricting pivot 8 projecting slightly above the expanding pivot 7 is provided with an arc-shaped guide hole 1 of a side plate 4 to be described later.
1 has a small shaft portion 8a inserted with a gap therebetween, and a base end portion 8b having a larger diameter than the guide hole 11 of the side plate 4 formed at the base end thereof. Axis 7 for expansion
The length is equal to or longer than the protruding portion of the holding cylinder 10.

However, it is not always necessary to provide the expansion limiting pivot 8. In this case, an arc-shaped guide hole 11 is formed in the side plate 4.
Need not be formed.

On the other hand, as shown in FIG. 1, the side plates 4, 4 provided on both the left and right sides of the back plate 3 are formed into a curved plate shape along the height direction of the back plate 3. In the drawing, a plurality of holes 22 are provided inside the side plate 4. This is to reduce the weight of the side plate 4, and by providing a rib around the punched hole 22, the strength of the entire side plate 4 can be made appropriate.

Further, as shown in FIG. 4 or FIG.
An arc-shaped guide hole 11 is formed in the upper part of the first hole, and an insertion hole 12 is formed slightly below the guide hole 11.

The expansion pivot 7 of the head protection plate 6 is inserted into the insertion hole 12 of the side plate 4, and the end of the expansion pivot 7 is fixed with a screw 24 via a washer 23. By doing
The side plate 4 can move to the left in FIG. 4 or FIG. 5 against the elastic force of the spring 9 within the extra length of the expanding pivot 7 protruding from the end of the holding cylinder 10.

However, inside the insertion hole 12 of the side plate 4, the outer cylinder 2 attached to the outer periphery of the holding cylinder 10 with a gap is provided.
A projection 5 is provided to prevent the spring 9 from being exposed while the spring 9 is concealed.

An expansion limiting pivot 8 projecting from the head protection plate 6 into a guide hole 11 formed in an arc shape of the side plate 4.
Of the narrow shaft 8a protruding from the end of the base end 8b by fixing the end of the expansion limiting pivot 8 with a screw 24 via a washer 23. The side plate 4 can be moved leftward in FIG. 4 or 5 by the length.

On the other hand, as shown in FIG. 4, an insertion hole 27 is formed in a lower portion of the side plate 4 and an outer cylinder 29 is formed outside the insertion hole 27. Inside the outer cylinder 29, a lower peripheral portion of the back plate 3 is connected. Rod 5a
The side plate 4 is easily tilted by inserting the pivot 26 projecting at a predetermined position with a gap 30 therebetween. Also, with the extra length 28a left at the end of the pivot 26, the screw 2
As shown in FIG. 5, the side plate 4 can be moved left and right or tilted (moved or tilted by the amount of the gap) by the extra length 28a to prevent the side plate 4 from coming off. ing.

However, in the above configuration, the gap 30 between the insertion hole 27 and the pivot 26 may be eliminated, or the screw 28 may be screwed to the end of the pivot 26 without leaving the extra length 28a. In this case, the tilting of the side plate 4 is enabled by the bending (deformation or the like) of the material of the side plate 4, thereby enabling the side plate 4 to expand in a state in which the side plate 4 is prevented from being detached as described above. Therefore, as the material of the side plate 4, it is preferable to select a material having appropriate flexibility and appropriate strength such as synthetic resin.

The position where the pivot 26 should be provided is
In FIGS. 1, 4, 5 and the like, the connecting rod 5a is used, but it is not necessary to limit to this.

The tip of the pivot 26 is formed in an arcuate surface so that the side plate 4 can be easily tilted.

With the above configuration, when the back plate 3 is raised as shown in FIG. 4, each side plate 4 is expanded by the elastic force of the spring 9 of the expansion pivot 7, and
The expansion restricting pivot 8 is brought into an upright state by the locking action of the washer 23.

As shown in FIG. 1, the back plate 3 is
When folded to the side, the head protection plate 6 stands upright along the back plate 3 as described with reference to FIG. 1, and the side plate 4 comes into contact with the inside of the armrest 5 as shown by the arrow in the figure, thereby inward. It is pushed to.

As shown by the arrow in FIG. 5, the elastic force of the spring 9 of the expanding pivot 7 is centered on the pivotal position below the side plate 4 (the screw 28 of the pivot 26). Leans inward against At this time, the side plates 4 move inward from the upright position indicated by the two-dot chain line shown in FIG. 3 to reduce the width of the side plates 4, 4 on both sides.

For convenience of explanation, the above-mentioned seating device has a structure in which the internal structure is exposed. However, in an actual finished product, the seat plate 2, the back plate 3, the side plate 4, the armrests 5,
A cushion material is attached to the head protection plate 6 and the like, and the above-described operation is performed in a state where the side plate 4 and the armrest 5 have the thickness of the cushion material on the left and right.

In such a configuration, when the back plate 3 is raised, the side plates 4 on both sides are in an expanded state, so that the seating space can be widened.

When the back plate 3 is folded in the direction of the seat plate 2, the side plates 4, 4 on both sides are inclined inside the armrests 5, 5 on both sides. The side plates 4, 4 can be stored inside the armrests 5, 5 even if the configuration is narrower than the interval of 4.

As another embodiment of the present invention, the left and right side plates 4, 4 can be configured as shown in FIGS. That is, as shown in FIGS. 6 and 7 (a), the side plate 4 can be bent as shown in FIG. 7 (b) by the hinge 32 provided along the longitudinal direction of the side plate 4.

The hinge 32 is formed such that the thickness of the synthetic resin material forming the side plate 4 is reduced at the hinge position so as not to be cut off by many bending operations.

Such processing is generally performed in molding processing of synthetic resin. This is called hinge processing, and if you repeat the bending operation several times immediately after molding,
The strength is increased by orienting the flow of the resin in one direction.

Further, as shown in FIG.
Are formed on both sides thereof with inner stoppers 33a, 33a and outer stoppers 33b, 33b. The inner stoppers 33a, 33a have a gap in the upright state of the side plate 4 so as to regulate the inclined state of the side plate 4, and the outer stoppers 33b, 33b are formed to stop the side plate 4 in the upright state. .

At the appropriate positions above and below the side plate 4, on the outside of the side plate 4, projections 35, 35 which lock both ends of a tension spring 34 shown in FIGS. Is provided so as to sandwich the side plate 4, and acts so that the side plate 4 is always kept upright by the tensile force of the tension spring 34.

Also in this configuration, when the side plate 4 comes into contact with the armrest 5 by the operation of folding the side plate 4 in the direction of the seat plate 2 as described above, the side plate 4 is pushed by the armrest 5 and 4 tilts inward, and the upper half of the side plate 4 is tilted and housed inside the armrest 5 via the hinge 32 as shown in FIG. Can be reduced in width.

Further, as another embodiment of the expanding pivot 7, the configuration shown in FIG. 8 can be applied.

The expanding pivot 7 shown in FIG. 8A does not include the holding cylinder 10 and the outer cylinder 25 shown in FIG.
The spring 9 inserted into the expansion pivot 7 is engaged with the large-diameter portion 7 b of the expansion pivot 7, and is inserted into the insertion hole 12 of the side plate 4.
Of the side plate 4 against the elastic force of the spring 9 by fixing to the shaft portion 7a of the
It can be moved to the left of (a).

Further, the expanding pivot 7 shown in FIG.
An elastic member 9 'is provided in place of the spring 9 of (a).

As the elastic member 9 ', other than elastic rubber, for example, a member such as MNCS (Munchs) of Bridgestone Corporation or αGEL of Siegel Corporation may be used.

Among these, MNCSs include those in which a liquid is sealed in a three-dimensional network structure of a special polymer, those in which the liquid is sealed with a thermosetting elastomer, and those in which these are further foamed. ΑGEL is a gel-like substance mainly composed of silicone, and can exhibit elastic characteristics according to its structure by adjusting a special cross-linking state and molecular structure, adding a filler, and the like.

9 to 11 show a back plate 3 'in which the back plate 3 and the head protection plate 6 are integrated as an embodiment of the present invention. The upper part of the back plate 4 is not provided with the expansion limiting pivot 8 in FIG.
As shown in FIG. 9 (a), the expansion pivot 7 having the same construction as in (b) and the like is elastically urged outward, and is formed as a pivot 36 protruding below the side plate 4 as shown in FIG. Alternatively, an L-shaped lower standing piece 36 "shown in FIG. 9B is formed and supported in a state of being fixed with screws or the like.

When the back plate 3 and the head protection plate 6 are not integrated and have the same configuration as that of FIG. 1 and the expansion limiting pivot 8 is not provided in the same manner as described above, the circle of the side plate 4 is used. Arc-shaped guide hole 11
Need not be formed. In this case, as in FIG. 1, the lower portion of the side plate 4 is pivotally connected to the pivot 26 of the connecting rod 5a.

The structure of the pivot 36 below the side plate 4 is as follows.
In addition to the configuration of simply pivoting and supporting without using an elastic member, a spring 9 or another elastic member 9 ′ described above is provided outward similarly to the expanding pivot 7 at the upper part of the side plate 4. When the back plate 3 is folded and elastically urged, the side plate 4 is moved inward against the elastic force of the spring 9 or another elastic member 9 ′ by the pressing force when the side plate 4 hits the armrest 5. You may do so.

In the above embodiment, a stroller is used as a seating device. However, the present invention is not limited to such a stroller, and a seating device having side plates 4, 4 on both sides of a back plate 3. It can be applied generally.

[0059]

As described above, the variable mechanism of the side plate of the seating device according to the present invention allows the side plate provided on both sides of the back plate pivotally attached to the rear end of the seat plate to expand and contract. Along with
Since the side plates are elastically urged toward the return direction, the interval between the side plates on both sides is configured to be smaller than the interval between the armrests on both sides, and the side plates on both sides are expanded when the back plate is raised. In this state, the seating space is widened, and the side plates on both sides can be stored in the armrests on both sides when the back plate is folded toward the seat plate side.

Therefore, it is possible to secure a wide seating space by widening the left and right side plates when the seat device is folded compactly and the back plate is raised without increasing the space between the armrests of the seat device.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the vicinity of a back plate of a seating device according to the present invention.

FIG. 2 is a perspective view of the upper mounting portion of the side plate according to the present invention, showing an expanded state.

FIG. 3 is a perspective view of an upper mounting portion of the side plate according to the present invention, showing a state in which the side plate is tilted inward.

FIG. 4 is a cross-sectional view of the upper mounting portion of the side plate according to the present invention, showing an expanded state.

FIG. 5 is a cross-sectional view of the upper mounting portion of the side plate according to the present invention, showing a state in which the side plate is moved inward.

FIG. 6 is a perspective view showing another embodiment of the present invention, showing the periphery of one side plate of the seating device.

FIG. 7 is a cross-sectional view of another embodiment of the present invention, showing an upright state and a fall-down state of a side plate.

FIG. 8 is a sectional view showing another embodiment of the expanding pivot according to the present invention.

FIG. 9 is a perspective view showing the vicinity of a back plate of a seating apparatus according to another embodiment of the present invention.

FIG. 10 is a perspective view of an upper mounting portion of a side plate according to another embodiment of the present invention, showing an expanded state.

FIG. 11 is a perspective view of an upper mounting portion of a side plate according to another embodiment of the present invention, showing a state in which it is moved inward.

FIG. 12 is a rear perspective view of a conventional stroller.

FIG. 13 is an exploded perspective view of a back plate, a side plate, a head protection plate and the like of a conventional stroller.

FIG. 14 is a view showing a state of undulation of a head protection plate that changes according to the state of inclination of the back plate of a conventional stroller.

[Description of sign]

 2 ... seat plate 3 ... back plate 3 '... back plate with integrated head protection plate 4 ... side plate 5 ... armrest 5a ... connecting rod 6 ... head protection plate 7 ... pivot for expansion 7a ... shaft portion 7b ... large Diameter portion 8: Expansion limit pivot 8a: Fine shaft portion 8b: Base end portion 9: Spring 9 '... Other elastic member 10: Holding cylinder 11: Guide hole 12: Insertion hole 26 ... Axis 27: Insertion hole 28a Extra length 28 ... Screw 29 ... Outer cylinder 32 ... Hinge 33a ... Inner stopper 33b ... Outer stopper 34 ... Tension spring 35 ... Protrusion 36 ... Pivot 36 ', 36 "... Lower standing piece

Claims (6)

[Claims] 1. A back plate pivotally attached to a rear end of a seat plate is folded toward the seat plate side, and side plates provided along both sides of the back plate are provided inside armrests provided above both sides of the seat plate. A variable mechanism for a side plate of a seating device, wherein the seating device is provided with expansion / contraction means for expanding / contracting the width between the side plates by the elastic force of an elastic member. 2. A variable mechanism for a side plate of a seating device according to claim 1, wherein said expanding / contracting means is provided on an upper portion of said side plate. 3. A variable mechanism for a side plate of a seating device according to claim 1, wherein said expanding / contracting means is provided at an upper portion and a lower portion of said side plate. 4. The expansion / contraction means projects an expansion pivot provided with an elastic member at an upper side of the back plate, and inserts the expansion pivot into an insertion hole formed at an upper portion of the side plate. Then, the elastic member is locked in a state of being urged outward, and an insertion hole formed in a lower portion of the side plate is protruded from a lower side portion of the back plate or a side portion of a lower standing piece. By pivotally attaching to the support shaft, the side plate is expanded by an elastic member in a state where the back plate is raised, and the side plate is pushed by the armrest in a state where the back plate is folded, thereby reducing the expansion width. The variable mechanism of the side plate of the seating device according to claim 1, wherein the side plate of the seating device is provided. 5. The enlargement / reduction means includes a head protection plate pivotally attached to an upper end of the back plate, and a projection pivot provided with an elastic member mounted on a side of the head protection plate, and an insertion hole formed in an upper portion of the side plate. The expansion pivot is inserted into and fixed to the elastic member in a state where the elastic member is urged outward, and is separated slightly upward from the expansion pivot projected on the head protection plate. And an extension-restricting pivot is protruded, and the extension-restricting pivot is inserted into an arc-shaped guide hole formed slightly above the insertion hole of the side plate. While being locked by the portion, the insertion hole formed in the lower part of the side plate is pivotally attached to a support shaft protruding at a predetermined position of a connecting rod pivotally attached to the armrest, so that the back plate is raised. The side plate is expanded by an elastic member, and the side plate is pushed by the armrest in a state where the back plate is folded to reduce the width of expansion. Claim, characterized in that there was Unishi 1
3. The variable mechanism of the side plate of the seating device according to claim 2. 6. The expanding / contracting means includes a hinge provided along a longitudinal direction of the side plate, the side plate being bendable, an elastic member for returning the side plate from the bent state to a flat state, and the side plate standing upright. 2. The variable mechanism for a side plate of a seating device according to claim 1, wherein the stopper is configured to stop in a state.