JPH0965949A - Folding chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utterly solve problems such as breakage of a flexion part of a rear leg due to the concentration of stress on the flexion part, the tendency of an easy occurrence of damage due to an impact during stacking operation, the deterioration of an operating efficiency during the stacking, the collapse of the chair on account of a lateral skidding, and the increase of a stacking pitch, by improving the shape and structure of a linkage part between the rear leg and the front leg of the folding chair. SOLUTION: This folding chair has a back rest 12 provided on the upper end part, and a front frame 1 of pipe material forming a front leg 11, below, connected to the upper end part. In addition, a pivotally fixing member 4 to be linked to the front frame 1 is fitted to the upper end part in such a manner that the member 4 can be projected and extracted. Further, the chair consists of a rear frame 2 of a pipe material forming a rear leg 21, below, connected to the upper end part, and a seat 3 with the front end side supported by the front frame 1, in freely rotatable manner, from a supporting position provided by the rear frame 2. The pivotally fixing member 4 is pivotally fixed on the external surface of the front frame 1 at the pivotal center of projection and retraction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding chair which can be folded and stacked.

[0002]

2. Description of the Related Art As a folding chair of this type, as shown in FIG. 18, a front leg a having a backrest attached to its upper end, a rear leg b pivotally connected to the front leg a, and both legs a, b.
The seat c is pivotally supported on the front leg a and the rear leg b, and the seat c is raised to the backrest side so that the front leg a, the rear leg b, and the seat c can be folded in a substantially planar manner. It is known to do so.

When the operation of rotating the seat c of the chair from the use position toward the backrest side is considered with reference to the connecting portion d between the rear leg b and the seat c, the rear leg b and the front leg a are separated. The connecting portion e gradually moves away from the connecting portion d between the rear leg b and the seat c as the seat c is rotated toward the backrest side. In order to absorb this displacement with a simple structure, the one shown in the figure pivotally attaches the rear leg b to the rear portion of the front leg a via a sliding shaft f capable of projecting and retracting, and in the folding position shown in FIG. The substantial leg length of the rear leg b is changed by the sliding action of the sliding shaft f.

[0004]

By the way, in the case of such a configuration, the front leg a and the rear leg b stand up straight in such a manner that they can approach each other in a parallel position without interfering with each other at the folding position. In addition, the vicinity of the upper end of the rear leg b is bent forward in an inverted V shape. That is, the rear leg upper end b ₁ is pivotally attached to the front leg a at a position in front of the rear leg b and the sliding shaft f on the axis. Therefore, a load is applied to the seat c,
When a compressive force is applied to the rear leg b on the basis of this, an internal stress is unreasonably generated in the bent portion b ₂ of the rear leg b, and there is a problem that the portion is likely to be damaged. In addition, such a bent portion b ₂ has a corner g on the chair folded in a plane.
To make it easier to cause local collisions between chairs,
Through the stacking work that is often performed relatively rough, the presence of the corners is a factor that further accelerates the damage.

In addition to the above-mentioned problems, the chair described above has a front leg a and a rear leg b when folded and stacked.
Are polymerized substantially in parallel as shown in FIG. Therefore, on the stacking position is not determined, shown in the normal arrows and phantom lines in the figure between the hind b ₂ front leg a ₁ and the other chair A ₂ of one of the chair A ₁ made by steel pipes It causes skidding like this and the stacking state is easy to collapse. For this reason, there is an example in which an extremely complicated measure is taken such that the surroundings are accommodated in a trolley or the like that is enclosed and stored.

An object of the present invention is to provide a folding chair that eliminates all such problems.

[0007]

In order to achieve the above object, the present invention takes the following measures. That is, the folding chair according to the present invention is connected to the front frame made of pipe material, which has a backrest at the upper end, and which forms a front leg continuously downward to the upper end, and the upper frame at the front frame. A rear frame made of a pipe material in which a pivoting member is fitted so as to project and retract, and a rear leg is formed continuously downward from the upper end, and a side surface near the rear edge is rotatably supported by the rear frame. And a seat rotatably supported on the front frame on the front end side of the support position by the frame thereafter, the pivotal attachment member has an outer surface of the front frame on the projecting and retracting axis thereof. It is characterized by being pivotally attached to.

In order to effectively improve the stool during stacking, the front frame and the rear frame are substantially U-shaped with an upward opening, and the lower end base portion of the rear frame is the lower end of the front frame in the folded position. It is desirable to be configured to be located slightly rearward and downward with respect to the base portion.

In order to prevent the chair from being bulky, it is effective that the cross sections of the front frame and the rear frame have a flat elliptical or oval shape with the major axis oriented in the front-rear direction.

With such a construction, the upper end of the rear frame, which has risen from the floor in the use position, is located at a position substantially coincident with the center of the frame on the protrusion / depression axis of the pivot member. In other words, at the position where it extends straight from the axis of the rear frame, the outer surface of the front frame is pivotally attached. Therefore, even if a load is applied to the chair in the use position and a compressive force acts on the rear frame based on the load, it is possible to prevent the compressive force from immediately leading to local internal stress. Therefore, stable strength can be exhibited as a whole. Moreover, the chair is entirely flat when folded, and does not have a partly angular portion. Therefore, even if the stacking work is relatively rough, local collisions between chairs are unlikely to occur, and early damage to the chairs can be effectively prevented.

In addition to the above, when the front frame and the rear frame are substantially U-shaped and the lower end base portion of the rear frame is positioned rearward and downward with respect to the lower end base portion of the front frame in the folding position, the rear frame The left and right legs of the front frame are slightly inclined with respect to the left and right legs of the front frame, and the U-shaped rear frame surrounds the front frame at a position slightly raised from the U-shaped front frame. Will exist. For this reason, when a different chair is folded and stacked on a chair that has been folded earlier, the U-shaped front frame of that chair enters the inner periphery of the U-shaped rear frame of the previously folded chair and partially It is fitted and the positional displacement in the left-right direction and at least downward is prohibited at that position. Figure 17 shows the upward displacement.
This can be prevented by touching the lower side of the back to the lower side of the seat of the next chair like. Therefore, even if the stacking work is performed relatively roughly, the chair can be guided to the proper stacking position, and at the same time, the stack pitch can be made extremely small. Moreover, when the chairs are partially fitted in the positioning state in this way, the possibility that the front frame of the other chair may skid with respect to the rear frame of the other chair is significantly reduced. Even if the chairs are stacked, it is possible to effectively prevent the situation where the stacking state easily collapses.

Particularly, if the front frame and the rear frame are made to have a flat cross-sectional shape, even if the front frame and the rear frame are superposed on the side of the seat, the whole chair is greatly bulky in the width direction. It can be effectively prevented.

As described above, according to the chair of the present invention, not only high strength can be imparted to the chair itself but also a large number of chairs can be stacked in a compact manner in a stable state, and a storage space can be taken more than necessary. It is also possible to eliminate the need for a special dolly or the like for storing the chair.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

The folding chair 100 of this embodiment has a front frame 1 and a rear frame 2 as shown in FIGS.
And a seat 3, and the front frame 1, the rear frame 2, and the seat 3 are overlapped as shown in FIGS. 8 to 12, and are configured to be folded in a substantially plane. .

More specifically, each of the front frame 1 and the rear frame 2 is made of a steel pipe having an elliptical or oval shape with a flat cross section in which the major axis is oriented in the front-rear direction and the minor axis is oriented in the width direction. The lower end side thereof is bent into a substantially U shape, and the lower end base portions 11a and 21a are grounded by inclining in a side view C shape with respect to the floor F, and the lower end base portions 11a and 21a stand up. Left and right legs 11, 2
1 and 1 are formed. A backrest 12 is integrally attached to the upper end of the front frame 1 so as to be curved forward from the widthwise central portion toward the widthwise edge while maintaining a substantially constant thickness between the front side and the back side. There is. A pivoting member 4 is fitted on the upper end of the rear frame 2 so as to be able to project and retract. As shown in FIGS. 1 and 8, the pivot member 4 includes a shaft portion 41 slidably fitted to an inner periphery of an upper end portion of a steel pipe forming the rear frame 2, and a shaft portion 41 of the shaft portion 41. A block body 42 having an upper end and a cross-sectional shape that is substantially the same as that of the rear frame 2 and extending entirely in a straight line along the center line of the rear frame 2, and protruding toward the inner surface side of the block body 42. And a support shaft 43.

Then, after this, the side surface near the rear edge of the seat 3 is rotatably supported by the rear frame 2 via the first shaft supporting portion 5, and the side surface of the front frame 1 is supported by the second shaft supporting portion 6 via the second shaft supporting portion 6. While supporting the side surface of the seat 3 on the front end side so as to be rotatable,
The rear frame 2 and the front frame 1 are connected via the pivotal member 4.

The first shaft supporting portion 5 is shown in FIGS. 1 and 3 to 5.
As shown in FIG. 2, it comprises an L-shaped bracket 51 fixedly mounted on the inner surface of the rear frame 2, and a support shaft 52 protrudingly provided on the tip end surface of the bracket 51. The support shaft 52 is provided on the side surface of the seat 3. It is configured to be pivotally connected to each other. The bracket 51 has its arm length set to an appropriate dimension so as to form a gap between the side surface of the seat 3 and the inner surface of the rear frame 2 when the bracket 51 is folded.
As shown in FIG. 1, FIG. 2, FIG. 4 and FIG. 5, the second shaft supporting portion 6 has the inner surface of the front frame 1 arranged close to the side surface of the seat 3, and at the position thereof, both of them are supported by a supporting shaft 61. It is a pivotal one. As shown in FIGS. 1 to 4 and 6, the pivoting member 4 has its shaft portion 41 completely retracted into the rear frame 2 and the lower end surface of the block body 42 when the chair 100 is in the use position. The pivot position of the support shaft 43 with respect to the outer surface of the front frame 1 is selected so as to be in contact with the upper end surface of the rear frame 2.

In the folding position shown in FIGS. 8 to 12, the lower end base portion 21a of the rear frame 2 is set so as to be located at a position displaced rearward and downward with respect to the lower end base portion 11a of the front frame 1. I am doing it. Further, in the figure, 11b and 21b are resin slip preventing members for improving the grounded state of the lower end base portion.

With such a structure, the upper end of the rear frame 2 standing up from the floor surface F at the use position is substantially at the center of the rear frame 2 as shown in FIGS. 1, 2 and 6. The support shaft 4 of the block body 42 arranged at a position that extends linearly on the projecting and retracting shaft center of the shaft portion 41 fitted at the matching position, that is, on the axis of the leg portion 21 of the rear frame 2.
It is pivotally attached to the outer surface of the front frame 1 via 3. Therefore, even if a load is applied to the chair in the use position and a compressive force acts on the rear frame 2 based on the load, the compressive force is linearly transmitted to the leg portions 21 of the rear frame 2 through the block body 42. As a result, there is no place where internal stress is locally generated. Therefore, stable strength can be exhibited as a whole, and the durability of the chair can be improved.

On the other hand, when the seat 3 of the chair is rotated toward the backrest side from the use position toward the folding position, the shaft portion housed in the rear frame 2 during use is shown in FIGS. 2 and 6. 8 and 12 as 41 is folded.
As shown in FIG. Then, this chair is shown in FIG.
As shown in FIG. 12, it has a planar shape as a whole. In particular, focusing on the pivotal connection between the rear frame 2 and the front frame 1,
Since the rear frame 2 is linearly pivoted to the front frame 1 via the rear leg 21 and the pivoting member 4, in the folded state, the pivoting portion forms a partly angular portion as in the conventional case. Never. Therefore, even if the stacking work is relatively rough, local collisions between chairs are unlikely to occur, and early breakage of the chairs can be effectively prevented.

In addition, the front frame 1 and the rear frame 2 are substantially U-shaped, and the lower end base portion 21a of the rear frame 2 is in the folded position and the lower end base portion 11a of the front frame 1 is in the folded position.
Since it is set so as to be positioned rearward and downward with respect to the left and right, as shown in FIG.
Is slightly inclined with respect to the left and right leg portions 11 of the front frame 1, and the U-shaped rear frame 2 as a whole.
11 and 12 with respect to the U-shaped front frame 1.
As shown in FIG. 5, the frame 1 is present so as to surround the frame 1 from the outside at a slightly raised position on the back side.
Therefore, the stacking convenience is effectively improved. That is, in the stacking state shown in FIGS. 13 to 16 in which the chair is laid on the floor surface F, the component parts of the first folded chair are attached with a suffix of 1, and then the chair component parts of the folded and stacked chair are changed to 2 When the chair components that are folded and stacked are further labeled with the suffix of 3, the chair 100 ₁ that is folded first and the chair 100 ₂ that is folded next are stacked in the latter U shape. frame 2 _first leg 21 after the legs 11 ₂ and the lower base portion 11a ₂ of the previous frame 1 ₂ forming the forming the former _U-1 and lower base portion 21a
Partly fitted into the inner circumference of ₁ a little,
At that position, displacement in the left-right direction and at least downward is prohibited. The upward displacement can be prevented by contacting the lower side of the back with the upper side of the seat of the next chair 100 ₂ . The same applies to the relationship between the chair 100 ₂ and the chair 100 ₃ . Therefore, this chair can guide each chair to an appropriate stacking position even if the stacking work is performed relatively roughly, and at the same time, the stack pitch can be made extremely small by partially fitting in the stacking direction. You can Besides, the chairs 100 ₁ , 100 like this
When ₂ s is partially fitted in a positioned state, the frame 2 ₁ front frame 1 ₂ of the other chairs 100 ₂ against after the other chair 100 ₁ is a risk of skidding is substantially reduced. The same applies to the chairs 100 ₂ and 100 ₃ . Therefore, it is possible to reliably prevent the situation where the stacking state is easily collapsed. Chair 100
Even when a larger number of chairs are stacked on the chair ₃ , the above-mentioned effects can be established in the same manner between any adjacent chairs. In addition, as shown in FIG.
Even when leaning against each other and stacking as shown in FIG.

Furthermore, in this embodiment, the chair 10
Since the front frame 1 and the rear frame 2 constituting 0 are flat cross-sectional shapes, even if the front frame 1 and the rear frame 2 are arranged side by side on the seat 3, the entire chair is wide in the width direction. It is possible to effectively prevent large bulkiness,
At the same time, the above-mentioned skid prevention effect can be made more effective.

The configuration of each part is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing a chair according to an embodiment of the present invention in a use state.

FIG. 2 is a front view of the same.

FIG. 3 is a rear view of the same.

FIG. 4 is a plan view of the same.

FIG. 5 is a bottom view of the same.

FIG. 6 is a right side view of the same.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is a front view showing the chair of the same embodiment in a folded state.

FIG. 9 is a rear view of the same.

FIG. 10 is a plan view of the same.

FIG. 11 is a bottom view of the same.

FIG. 12 is a right side view of the same.

FIG. 13 is a front view showing a state in which the chair of the same embodiment is laid on the floor and stacked.

FIG. 14 is a right side view of the same.

FIG. 15 is a sectional view taken along line XV-XV in FIG. 14;

16 is an enlarged sectional view taken along line XVI-XVI in FIG.

FIG. 17 is a right side view showing a state in which the chair of the same embodiment is leaned against and stacked.

FIG. 18 is a side view showing a conventional example in use.

FIG. 19 is a side view showing the conventional example in a folded state.

FIG. 20 is a front sectional view showing a stacking state of the conventional example.

[Explanation of Codes] 1 ... Front frame 2 ... Rear frame 3 ... Seat 4 ... Pivot member 11 ... Front leg 11a ... Bottom base part 12 ... Backrest 21 ... Rear legs 21a ... Bottom base part 100 ... Folding chair

Claims (3)

[Claims] 1. A front frame made of pipe material having a backrest at its upper end and forming front legs downwardly from the upper end, and a pivotally connected member connected to the front frame at the upper end. A rear frame made of a pipe material that is fitted so as to be retractable and has rear legs formed continuously downward from the upper end, and a side surface near the rear edge is rotatably supported by the rear frame, and the rear frame is A seat that is rotatably supported on the front frame on the front end side of the support position by the pivoting member, the pivoting member pivoting to the outer surface of the front frame on the axis of projection and depression. Folding chair characterized by being worn. 2. The front frame and the rear frame are substantially U-shaped and open upward, and the lower end base portion of the rear frame is located slightly rearward and lower than the lower end base portion of the front frame in the folded position. The folding chair according to claim 1, wherein the folding chair has the following structure. 3. The folding chair according to claim 1, wherein the cross-sections of the front frame and the rear frame are flat elliptical or oval with the major axis oriented in the front-rear direction.