JP2002177086A - Connecting device for folding chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device for a folding chair, wherein connecting members are hard to detach even if an unexpected external force is applied, and the fitted state of the connecting members is firmly kept. SOLUTION: This connecting device has the connecting member 2 comprising a connecting member body 3 and a turn stopping member 4. The connecting member body 3 is equipped with a mounting section 5 having a U-shape when seen on a plan, and a fitting section 6 which is projected out from the mounting section 5. The turn stopping member 4 is equipped with a body attaching section 8 which is attached to the opening of a U-shaped groove of the mounting section 5, and a shaft attaching section 9 which is attached to a shaft section 55 of a folding chair 51. Then, the shaft attaching section 9 of the turn stopping member 4 is attached to the shaft section 55 of the folding chair 51. The mounting section 5 of the connecting member body 3 is fitted on the main frame 55, and the turn stopping member 4 is engaged with the opening of the U-shaped groove 5c of the connecting member body 3 under a locked state. The fitting sections 6 and 6 of the connecting member bodies 3 and 3 which are confronted with each other are fitted, and the folding chairs 51 and 51 are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for connecting folding chairs which are used when connecting a plurality of folding chairs in a gymnasium or a lecture hall in a horizontal direction.

[0002]

2. Description of the Related Art For example, in a gymnasium or an auditorium where a ceremony or a lecture is held, many seats are not permanently installed. There may be a seat. In such a case, a folding chair provided with a connecting means for connecting adjacent chairs to each other may be used so that the chairs are arranged straight in the lateral direction and can maintain the state. As such a connecting means, for example, there is known a connecting means in which connecting metal fittings are attached to opposed positions of adjacent folding chairs with screws or the like, and these connecting metal fittings are engaged with each other and connected.

[0003] However, in the case where the connecting fitting is screwed to the frame of the chair or the like, in addition to the screwing work, a troublesome operation of drilling a screw hole in the frame or the like becomes indispensable, which imposes a heavy burden on the operator. There is a disadvantage that it will be.

[0004] In order to solve such difficulties,
According to the prior proposal disclosed in Japanese Patent No. 2769126, a pair of connecting members that are removably attached to corresponding portions of respective frames of adjacent folding chairs by using elastic deformation, and that the connecting members themselves are prevented from rotating. Connection of a folding chair comprising: a detent portion provided with a locking member; A device has been proposed. According to this prior proposal device,
It can be applied to various folding chairs, does not require complicated installation work, and can be removed when the connecting member is not needed, and the appearance is damaged even after removing the connecting member. This is advantageous in that it does not occur.

[0005]

However, according to the connecting device for a folding chair according to the above-mentioned prior proposal, since the connecting member is removably attached to the folding chair by elastic deformation, there is an unexpected accident in the connected state. When the external force acts on the connecting device, the connecting member tends to be easily detached from the folding chair. For example, when the chair is transported or stored, the connecting member comes into contact with another folding chair or the like and detaches. There was a problem.

[0006] Such detachment of the connecting member causes various problems such as loss of the connecting member and re-attachment of the connecting member.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is difficult to detach a connecting member even when an unexpected external force is applied, so that the connecting state of the folding chair is firmly maintained. It is intended to provide a device.

[0008]

In order to achieve the above object, a connecting device for a folding chair according to the present invention comprises a pair of connecting members, and the connecting members rotate a seat plate through a shaft portion. A connecting member main body that covers a part of the outer periphery of the pipe material frame that is freely attached, and a rotation suppressing member that covers the remaining portion of the outer periphery of the frame, the left and right side walls of the connecting member main body are connected by a front wall. A mounting portion having a U-shape in plan view and a fitting portion projecting forward from the mounting portion are provided, and the rotation suppressing member is provided with a U-shaped mounting portion in the connecting member body. A main body mounting portion mounted on the groove-shaped opening portion, and a shaft mounting portion mounted on the shaft portion of the folding chair, wherein the shaft mounting portion of the rotation suppressing member is mounted on the shaft portion of the folding chair, The connection member body is mounted The frame is accommodated in the U-shaped groove so that the frame is housed in the U-shaped groove, and the rotation suppressing member is locked to the U-shaped groove opening of the connecting member main body in a state where removal in the opening direction is prevented. On the other hand, the fitting portions of the connecting member main bodies facing each other are fitted to each other, so that the folding chairs are connected to each other.

According to the present invention, since the connecting member covers the outer periphery of the frame of the folding chair by the connecting member main body and the rotation suppressing member and is mounted on the folding chair, the connecting member is protected against external force in any direction. The mounting state can be maintained relatively stably. In addition, the rotation suppressing member in which the shaft mounting portion is mounted on the shaft portion of the folding chair,
The U-shaped groove opening of the connecting member main body fitted to the frame so as to accommodate the frame in the U-shaped groove is locked in a state where removal in the opening direction is prevented. The connecting member is firmly held in a state of being attached to the frame of the folding chair, and is hard to be detached even with respect to an external force acting in the opening direction of the U-shaped opening groove portion of the connecting member main body having a high possibility of . Further, since the connecting member is composed of the connecting member main body and the rotation suppressing member and is attached to the frame by locking these members, it can be applied to an existing folding chair. it can.

The connecting member main body is formed with locking claws protruding inward at the rear end edges of the right and left side walls of the mounting portion, and the rotation suppressing member is formed at the rear side edges of the main body mounting portion. Locked grooves are respectively formed at positions corresponding to the left and right locking claws, and the locking claws are locked in the locked grooves, so that the connection member main body and the rotation inhibiting are formed. When the member is fitted, the locking claw of the connecting member main body is firmly fitted into the locked groove of the rotation suppressing member, so that the connecting member is more firmly attached to the frame of the folding chair. Attached to.

Further, in the case where the left and right locking claws are formed with inclined or curved surfaces on their rear surfaces in such a manner as to become thinner from the base end to the distal end, along the inclined or curved surfaces. Since the left and right locking claws are expanded outward, the rotation suppressing member can be easily fitted to the connecting member main body without the need for a tool or the like.

The fitting portion of the connecting member main body is provided with a locking piece extending in any one of the up and down directions and a locking hole opened in the same direction. One connecting member main body is disposed with the locking piece and the locking hole of the fitting portion facing upward, and the other connecting member main body is configured to lower the locking piece and the locking hole of the fitting portion downward. The locking piece of one connecting member main body is inserted into the locking hole of the other connecting member main body, and the locking piece of the other connecting member main body is locked in the locking hole of the one connecting member main body. In the case where both connecting members are fitted by being inserted into, and the adjacent folding chairs are configured to be connected, a locking piece extending vertically in each connecting member and a locking piece extending in the vertical direction. Opening locking holes are provided, which are fitted into the corresponding locking holes and locking pieces. Because there, without connecting state is released also with respect to the horizontal direction of the external force, it is possible to more reliably connect adjacent folding chairs. In addition, the fitting portion of the connecting member main body is provided with a locking piece extending in any one of the up and down directions and a locking hole that opens in the same direction. It is also possible to use the same connecting member of the same shape, and it is also possible to improve productivity and convenience of handling.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connecting device for a folding chair according to the present invention will be described below with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing a folding chair (51) to which the connecting device of this embodiment is applied. To explain the folding chair (51), a main frame (52) formed in a rectangular frame shape and having a backrest at the top, a rear leg frame (53) formed in an upward U-shape, and left and right side edges The middle part and the rear end part are the left and right side middle parts of the main frame (52) and the rear leg frame (53), respectively.
The front and rear shaft portions (55) (5)
6) and a seat plate (54) attached through the rear frame (53). Upper ends of both side edges of the rear leg frame (53) are swingably mounted above the middle portions of the left and right side edges of the main frame (52). ing. The folding chair (51) can be switched between a folded state (not shown) and a seated state by opening and closing the main frame (52) and the rear leg frame (53).

As shown in FIG. 2, the connecting device (1) for a folding chair according to the present embodiment comprises a main frame (5) opposed to each of the adjacent folding chairs (51) and (51).
2) It is mounted slightly above the seat plates (54) and (54) in (52), and these adjacent folding chairs (5
1) (51) is connected to each other. The connection device (1) includes a pair of connection members (2) and (2) made of a hard synthetic resin as shown in FIGS.
In this embodiment, each of these connecting members (2)
(2) is different in that the later-described connecting member body (3) is turned upside down, and the other configuration is the same. Therefore, the following description will be made focusing on the connection member (2) on the left side of the figure as a representative.

As shown in FIG. 5, the connecting member (2) comprises a connecting member main body (3) and a rotation restraining member (4) provided inside the connecting member body (3). 4)
As shown in FIG. 4, the main frame (52) is attached to a predetermined position of the main frame (52) so as to cover the outer periphery of the main frame (52) at that position.

As shown in FIG. 6A, the connecting member main body (3) has left and right side walls (5a) (5a) and a front wall (5).
b), and a fitting portion (6) provided in the lower half of the front wall (5b) of the mounting portion (5) so as to protrude forward. Have.

The mounting portion (5) has left and right side walls (5a).
(5a) and the curved front wall (5b) form a U-shaped groove (5c) opened rearward, and the main frame (52).
Can be covered from three directions. The mounting portion (5) has locking claws (7) (7) protruding inward from the rear end edges of the left and right side walls (5a) (5a) over substantially the entire height. As shown in FIG. 6 (b), the locking claws (7) and (7) are formed so that the front surface is perpendicular to the opening direction of the U-shaped groove (5c) opening of the mounting portion (5). In addition, the rear surface is formed as an inclined surface or a curved surface (7a) (7a) such that the rear surface becomes thinner from the base end side to the front end.

On the other hand, the fitting part (6) is shown in FIG.
As shown in (b), a locking hole (6a) that is opened upward is formed at the middle part in the front-rear direction of the upper surface, and the front edge portion is located upward from the locking hole (6a). The locking pieces (6b), which are slightly smaller in width, protrude, and correspond to the locking pieces (6b) and the locking holes (6) of the other connecting member (1).
a). The locking hole (6a) may be a through hole or a bottomed hole, but a bottomed locking hole (6a) is recommended from the viewpoint of exhibiting a good appearance.

The rotation preventing member (4) prevents rotation of the connecting member (2) about the main frame (52),
This prevents the connecting member (2) from sliding along the main frame (52). As shown in FIG. 7 (b), the rotation suppressing member (4) includes a rectangular main body mounting portion (8),
A shaft mounting portion (9) mounted on the front shaft portion (55) of the folding chair (51), and these are connected to each other via a hinge portion (10) as shown in FIG. The two halves (11) and (11) are configured. Also,
A plurality of meshing portions (12) are projected from corresponding portions of the opposing surfaces of the left and right halves (11) and (11), and after the left and right halves (11) and (11) are completely closed. Is such that the state is firmly maintained. That is, as shown in FIGS. 7D and 7E, the pair of meshing portions (12) include a receiving hook portion (12a) protruding forward and a hook portion (12b) protruding rearward. When these are engaged, the closed state is maintained. Such a pair of meshing portions (12) are formed such that the receiving hook portion (12a) and the hook portion (12b) are alternately formed on one half (11),
This makes it difficult for the left and right halves (11), (11) to open after being closed.

FIGS. 7A and 7B show the main body mounting portion (8).
As shown in FIG. 3, the locking grooves (13) are formed on both sides of the rear surface of the connecting member body (3) corresponding to the locking claws (7) (7).
(13) is formed, and the locking claws (7) (7) of the connecting member main body (3) are locked to this.
Therefore, the rotation suppressing member (4) is locked to the connecting member main body (3) at the opening of the U-shaped groove (5c) so as to prevent the detachment in the opening direction. FIG.
As shown in (c) and (d), at the position opposite to the locked grooves (13) and (13) on the front surface of the main body mounting portion (8),
Inclined surface or curved surface (13a) inclined toward the outer edge
(13a) is formed.

On the other hand, as shown in FIG. 7 (b), the shaft mounting portion (9) is formed with a shaft mounting hole (9a) at the lower center in the front view. That is, as shown in FIG. 7 (a), semicircular notches (11a) and (11a) are provided below the left and right halves (11) and (11), respectively. 11) The shaft mounting hole (9a) is formed in the closed state, and the front shaft portion (55) of the folding chair (51) is sandwiched in the shaft mounting hole (9a). It has been done.

To attach the connecting member (2) to the main frame (52) of the folding chair (51), first,
As shown in FIG. 5, the front shaft (5) of the folding chair (51) is provided.
5) Attach the shaft mounting portion (9) of the rotation suppressing member (4). That is, the left and right halves (1) of the rotation suppressing member (4)
1) (11) is expanded to the left and right, and in the expanded state, the semicircular notch (11a) surface of one half (11) is applied to the front shaft portion (55). Then, when the other half (11) is closed to the one half (11) side as it is, the receiving hook portions of the corresponding engaging portions (12) of each half (11) (11). (12a) and the hook portions (12b) are in abutting condition. When the hook portions are further closed, the hook portions (12a) and (12b) are elastically deformed and the respective hook portions (12a) and (12b).
And the front shaft portion (55) is engaged with each other, and the front shaft portion (55) is inserted into the shaft portion mounting hole (9a). Next, the rotation suppressing member (4) is fitted to the connecting member main body (3). That is, first, the front surface of the rotation suppressing member (4) is brought into contact with the main frame (52). Next, the connecting member main body (3) is
The main frame (52) is accommodated in the U-shaped groove (5c), and the main body mounting portion (8) of the rotation suppressing member (4).
When it is inserted into the main body mounting portion (8), the locking claws (7) and (7) of the connecting member main body (3) abut against the inclined surfaces (13a) and (13a) formed on the front side edge of the main body mounting portion (8). When inserted, the locking claws (7) (7) have inclined surfaces (7a) (13a) formed on the rear surface and the front side edge of the main body mounting portion (8).
... and the left and right side walls (5a) of the connecting member body (3)
(5a) elastically deforms and expands. When the locking claws (7) and (7) cross over the side edges of the main body mounting portion (8), the left and right side walls (5a) and (5a) elastically recover, and the locking claws (7) and (7) are restored. Locked in the locked grooves (13) (13). In this way, the rotation suppressing member (4) is locked in the opening of the U-shaped groove (5c) of the connecting member main body (3) in a state of preventing removal in the opening direction, and the connecting member (2) is connected to the main frame ( 52). Then, the connecting member (2) obtained by inverting the connecting member body (3) up and down is connected to the main frame (52) of the adjacent folding chair (51).
Is mounted as described above.

The adjacent folding chairs (51) and (51) on which the connecting members (2) and (2) are mounted as described above are provided with locking pieces (6b) and (6b) of the connecting members (2) and (2). Are fitted into the locking holes (6a) (6a) of the mating connecting member (2), respectively, so that the connecting members (2) and (2) are fitted together. That is, the locking piece (6b) of the one connecting member (2) is inserted into the locking hole (6a) of the other connecting member (2), and the locking piece (6b) of the other connecting member (2) is inserted. )
Is inserted into the locking hole (6a) of one of the connecting members (2), thereby connecting the connecting members (2) and (2) as shown in FIG.
Fit each other. Thus, the adjacent folding chair (5
1) (51) can be easily and reliably connected to each other in the lateral direction. When connecting a plurality of folding chairs (51) horizontally, the connecting members (2) and (2) are attached to both side edges of the main frame (52) of each folding chair (51) and the above operation is repeated. Thus, the connection can be easily and reliably performed.

According to the folding chair connecting device (1), the connecting member (2) is composed of the connecting member main body (3) and the rotation suppressing member (4), and these members (3) and (4). )
Accordingly, the main frame (52) is mounted so as to cover the outer periphery thereof, so that the mounted state can be maintained relatively stably against external force in any direction. Moreover, the locking claws (7) (7) formed on the connecting member body (3) are locked by the locked grooves (13) (13) formed on the rotation suppressing member (4). As a result, the rotation suppressing member (4) is locked to the connecting member main body (3) in a state where removal is prevented in the opening direction of the U-shaped groove (5c) opening, and the connecting member main body (3) is prevented. ) Is firmly held in a state of being mounted on the main frame (52). Further, the rotation suppressing member (4) is provided with a receiving hook portion (12a) and a hook portion (12b) of an engaging portion (12)... Provided at corresponding portions of the left and right halves (11) and (11). Are alternately provided, so that the closing of the left and right halves (11) and (11) is locked with a locking structure, making it difficult to expand. Further, locking pieces (6b) are respectively attached to the opposing connecting members (2) and (2).
(6b) and locking holes (6a) (6a) are provided, which correspond to the locking holes (6a) (6a) and the locking pieces (6b).
(6b) is vertically inserted into the folding chair (51).
Can be connected, and the connected state is not released even by an external force in the horizontal direction.

On the other hand, the connecting member (2) comprises a connecting member main body (2) and a rotation suppressing member (4), and is mounted on the main frame (52) by fitting these members. Because of this, complicated mounting work is not required, and it can be retrofitted to an existing folding chair. Also, both right and left locking claws (7) of the connecting member body (3).
(7) The locking claws (7) (7) are formed by inclined surfaces or curved surfaces (7a) (13a) formed on the rear surface and both front side edges of the main body mounting portion (8) of the rotation suppressing member (4). ) Are configured to easily pass over both side edges of the main body mounting portion (8), so that the connecting member (2) can be easily mounted on the main frame (52). Moreover, the rotation suppressing member (4)
Consists of left and right halves (11) and (11) connected via a hinge portion (10).
1) By expanding (11), the front shaft portion (5
5) can be attached.

Although one embodiment of the connecting device (1) for a folding chair according to the present invention has been described above, the present invention is not limited to the above-described embodiment and does not depart from the spirit of the present invention. Various changes are possible within the scope. For example, the following changes are possible.

The connecting device (1) in this embodiment uses a pair of connecting members (2) and (2) in which the connecting member body (3) is turned upside down. A connecting device in which the member and the female connecting member are paired may be used. However, from the viewpoint of improving productivity and handling convenience, the connecting device (1) in which the connecting member body (3) having the same shape is turned upside down to form a male connecting member and a female connecting member.
It is desirable to use

Further, in this embodiment, the rotation suppressing member (4) is locked to the connecting member main body (3) in a state where the opening of the U-shaped groove (5c) in the opening direction is prevented. As the structure, a structure including the locking claws (7) and (7) and the locked grooves (13) and (13) is adopted, but the locking structure is not limited to this. A plurality of locking holes are provided at the left and right side edges of the movement suppressing member, and a diameter slightly larger than the locking hole is provided at a position corresponding to the locking hole at the rear end of the left and right side walls of the mounting portion of the connecting member body. A structure may be provided in which mushroom-shaped locking projections are provided, and these mushroom-shaped locking projections are forcibly fitted into the locking holes, so that the rotation suppressing member is fitted to the connecting member main body.

[0030]

As described above, according to the connecting device for a folding chair according to the present invention, the connecting member is constituted by the connecting member main body and the rotation suppressing member, and the outer periphery of the frame of the folding chair is constituted by these members. Since it is covered and mounted,
Regardless of the direction of action of the external force, the mounting state can be maintained relatively stably. In addition, the connecting member is firmly held in the mounted state even with an external force in the opening direction that is highly likely to be detached, so that it is difficult to detach. Therefore, once the connecting member is mounted on the frame of the folding chair, the connecting member is not lost due to removal and no re-attachment work is required, so that the folding chair is economical and hassle-free. Can be provided. In addition, any folding chair in which a seat plate is rotatably attached to a frame via a shaft portion can be widely applied to existing folding chairs.

The connecting member main body is formed with locking claws protruding inward at the rear end edges of the right and left side walls of the mounting portion, and the rotation suppressing member is formed at the rear side edges of the main body mounting portion. Locked grooves are respectively formed at positions corresponding to the left and right locking claws, and the locking claws are locked in the locked grooves, so that the connection member main body and the rotation inhibiting are formed. When the member is fitted and fixed, there is an advantage that the connecting member is more firmly held in the mounted state.

Further, in the case where the left and right locking claws are formed with inclined surfaces or curved surfaces on their rear surfaces so as to become thinner from the base end to the distal end, the inclined surfaces or curved surfaces are formed on the inclined surfaces or curved surfaces. The locking claw is expanded by being guided, and the connecting member can be easily mounted. That is, by pressing the connecting member main body against the rotation suppressing member, there is an advantage that the connecting member main body and the rotation suppressing member can be easily fitted. Therefore, when attaching the connecting member, a tool and other members are not required, and work efficiency is improved.

The fitting portion of the connecting member main body is provided with a locking piece extending in any one of the up and down directions and a locking hole opened in the same direction. The connecting member main body is disposed with the locking piece and the locking hole of the fitting portion facing upward, and the other connecting member main body has the locking piece and the locking hole of the fitting portion positioned downward. The locking piece of one connecting member main body is inserted into the locking hole of the other connecting member main body, and the locking piece of the other connecting member main body is inserted into the locking hole of the one connecting member main body. In the case where both connecting members are fitted by being inserted and connected so that adjacent folding chairs can be connected, a locking piece and a locking hole are formed in each connecting member. , These locking pieces are vertically inserted into the corresponding locking holes, so that There is an advantage that it is possible to more securely couple the that folding chairs. In other words, the connected state is not released even with external force in the horizontal direction,
In addition, due to the weight of the chair and the weight of the person in the seated state, a load acts on the fitting portion of the connecting device in the fitting direction, so that each connecting member is securely connected and maintained in this state. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a folding chair to which the connecting device for a folding chair according to the present invention is applied.

FIG. 2 is a perspective view showing an embodiment of a connecting device for a folding chair according to the present invention in a connected state.

FIG. 3 is a side view of the same.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an exploded perspective view showing an embodiment of a connecting device for a folding chair according to the present invention.

FIG. 6A is a perspective view showing a connecting member main body in a left connecting member of the connecting device. FIG. 2B is a plan view of the same.

FIG. 7A is a rear view showing the rotation suppressing member of the connecting member in a state where both left and right halves are expanded. The figure (b)
It is a rear view which shows the said rotation suppression member in the state by which both right and left halves were closed. FIG. 3C is a front view showing the rotation suppressing member in a state where the left and right halves are closed. Figure (d)
FIG. 2 is an enlarged sectional view taken along line AA in FIG. FIG. 7E is an enlarged sectional view taken along line BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Connecting device of a folding chair 2 ... Connecting member 3 ... Connecting member main body 4 ... Rotation suppressing member 5 ... Mounting part 5a ... Left and right side walls 5b ... Front wall 5c ... U-shaped groove 6 ... Fitting part 6a ... Locking hole 6b: locking piece 7: locking claw 7a: inclined surface or curved surface 8: main body mounting portion 9: shaft mounting portion 13: locked groove 51: folding chair 52: main frame 54: seat plate 55: front shaft portion

Claims (4)

[Claims] 1. A connecting member main body, comprising a pair of connecting members, the connecting member covering a part of an outer periphery of a pipe material frame to which a seat plate is rotatably attached via a shaft portion; The connection member main body includes a U-shaped mounting portion in which left and right side walls are continuously provided by a front wall, and protrudes forward from the mounting portion. The rotation suppressing member includes a main body mounting portion mounted on a U-shaped groove opening of a mounting portion of the connecting member main body, and a shaft mounting mounted on a shaft portion of the folding chair. A shaft mounting portion of the rotation suppressing member is mounted on a shaft portion of the folding chair, and the connecting member body is configured to accommodate a frame in a U-shaped groove of the mounting portion. The rotation inhibiting member is fitted to the connecting portion. In the U-shaped groove opening of the main body, while being locked in a state where removal in the opening direction is prevented, fitting portions of the connecting member main body facing each other are fitted, and the A connection device for a folding chair, wherein the connection device is configured to be connected. 2. The connecting member main body is formed with locking claws protruding inward at rear end edges of left and right side walls of a mounting portion thereof, and the rotation suppressing member is formed on both side edges of a rear surface of the main body mounting portion. Locked grooves are respectively formed at positions corresponding to the left and right locking claws, and each locking claw is locked in the locked groove,
The connecting device for a folding chair according to claim 1, wherein the connecting member main body and the rotation suppressing member are fitted. 3. The connecting device for a folding chair according to claim 2, wherein the left and right locking claws are formed such that an inclined surface or a curved surface is formed on a rear surface thereof so as to become thinner from a base end to a front end. 4. A fitting portion of the connecting member main body is provided with a locking piece extending in any one of the up and down directions and a locking hole opened in the same direction. One connecting member main body is disposed with the locking piece and the locking hole of the fitting portion facing upward, and the other connecting member main body is configured to lower the locking piece and the locking hole of the fitting portion downward. The engaging piece of one connecting member main body is inserted into the engaging hole of the other connecting member main body, and the engaging piece of the other connecting member main body is engaged with the engaging hole of the one connecting member main body. The connecting device for a folding chair according to any one of claims 1 to 3, wherein the connecting members are fitted to each other so as to connect the adjacent folding chairs.