JP2000004974A - Folding chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a required resistance for rotation operation of the seat of a folding chair to suppress a rapid opening/closing motion to unexpected opening/closing of legs by inserting a friction resistance means in between the side edge part of a seat crossing together with rotation of the seat and either front or back leg or on the crossing part in between front and back legs. SOLUTION: A male connection member 8 and a female connection member 10 are connected with the upper end parts of a front leg 1b and a back leg 2b. The whole of the male connection member 8 is integrally formed by bending one end into a chevron shape using a rod shape connection rod 9 as the core material, making the part flat, boring a through hole to penetrate a pin 11 at the center thereof, and further burying the part into synthetic resin. The female connection member 10 is made fit into and attached to an opening part on each upper end of right and left parts 2b of a back leg frame 2 and is inserted with the rod 9 along the axis part to connect with the male connection member 8. A notch 17 is formed on the female connection member 10, equipped with an elastic piece part 10a, and further a protruding bar 18 is equipped along the circumferential direction at about the center of the outer periphery face of the elastic piece part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front leg frame and a rear leg frame which are assembled in a character shape to support a seat, and when not in use, both leg frames are closed by turning the seat, and both leg frames are flattened together with the seat. The present invention relates to a folding chair that can be folded.

[0002]

2. Description of the Related Art A folding chair in which a front leg frame and a rear leg frame are assembled in a human shape and the legs are opened and closed in accordance with the rotation of the seat,
The seat itself controls the opening and closing of the front and rear leg frames.For example, to make a folded and unusable chair usable, a pivot point with the front leg frame is used as a fulcrum. This is done by pressing down on the front edge of the seat, opening the rear leg frame rearward by this depression, and opening the leg in a human shape. At this time, the seat that has been pushed down is horizontally supported by the legs before and after the leg is opened, and is in a usable state, and the seat is restrained from being closed by the seat and is stabilized.

The folding of the chair is performed by lifting the front edge of the seat and rotating the chair again so that the pivot point of connection with the front leg frame jumps up to the fulcrum. With this rotation, the both side edges are aligned with the front leg frame by this rotation, and the rear leg frame is pulled from the rear side and aligned behind the front leg frame, so that the seat is folded flat.

As described above, in the folding chair, the legs are opened and closed by rotating the seat. However, the seat rotates without permission after being folded or while being transported for storage. If the legs are opened, the handling becomes extremely troublesome and dangerous. In particular, sudden opening and closing may cause injury such as pinching of a finger and may also generate noise.

[0005] Therefore, in order to prevent the legs from being opened or closed without permission, conventionally, the shaft for pivotally connecting the legs and the seat is strongly tightened or the like, or a washer is fitted to the pivoted shaft and the legs and the seat are separated. The rotation resistance of the pinch shaft was increased so that the legs could not be freely opened and closed.

[0006]

However, according to this conventional method, it is necessary to keep the tightening of the pivot shaft constant for each product in order to make the products uniform, but this operation is troublesome.
It is also very difficult, and there is a problem in that there is variation between products. In addition, there is a problem that loosening occurs due to use and initial rotational resistance cannot be obtained, and the solution is not a sufficient solution.

The present invention has been developed in view of the above circumstances. Instead of caulking a pivot shaft or a resistance in a pivoting rotating portion using a washer or the like, the present invention is applied between the front and rear legs or between the leg and the seat. Provide a folding chair in which a required resistance is applied at the time of opening / closing operation of the seat by rotating the seat to suppress abrupt opening / closing movement and prevent an inadvertent opening / closing leg by interposing frictional resistance means. It is assumed that.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a friction between the legs of a front leg frame and a rear leg frame, or between these legs and a seat, which are assembled in a character shape. A required load is applied to the opening and closing movement of the legs by interposing the resistance means, or the rotation of the seat is required, so that these legs and the seat do not rotate unexpectedly. It is an object of the present invention to provide a folding chair that is restrained or restrained from being arbitrarily opened when the legs are folded and closed, and the handling thereof is easy and safe.

More specifically, the present invention is characterized by a front leg frame which supports a backrest between the upper ends of the left and right front legs, and a left and right leg formed substantially in a U shape and parallel to each other. A rear leg frame which is connected to the upper end part in the middle of the height of the left and right front legs and is assembled in the shape of a human character. The front leg and the rear leg each comprise a seat pivotally supported and supported, and at the time of folding, the front edge of the seat is pulled up and a pivot point with the front leg is flipped up and pivoted at a fulcrum. While pulling down the rear leg, it is aligned with the front leg and folded flat, and at the time of use, the front edge of the seat is pushed down and pivoted about the pivot point with the front leg at the same time as the rear leg is pulled up. Hold the upper end of the leg in place with the front leg and open it in a character shape to support the seat horizontally In a folding chair that can be seated, frictional resistance is applied to the intersection between the side edge of the seat intersecting with the rotation of the seat and any one of the front and rear legs, or the intersection between the front and rear legs. It is an object of the present invention to provide a folding chair characterized in that a sudden rotation of the leg and the seat is suppressed when the leg is opened and closed by inserting means.

The present invention also relates to the folding chair, wherein the frictional resistance means is inserted between a front leg and an upper end portion of a rear leg connected at a height of the front leg. The male and female connecting members are rubbed against each other when the legs are opened and closed so as to suppress abrupt opening and closing movement when the legs are opened and closed. To provide a pouch.

Further, according to the present invention, the frictional resistance means is formed as a protrusion on a side edge of the seat, and the protrusion is pressed into contact with a side surface of one of the legs before and after intersecting each other when the seat is rotated. An object of the present invention is to provide a folding chair which is slidably contacted and restrains rapid rotation when the legs are opened and closed by the frictional resistance. Next, the present invention will be specifically described based on embodiments shown in the accompanying drawings, and other features will be described.

[0012]

Embodiment

FIG. 1 is a perspective view of a folding chair according to the present invention when a leg is opened. FIG. 2 is a right side view of the chair of FIG. FIG. 4 is a right side view in which a part of a closed state is omitted, FIG. 4 is an enlarged right side view of a main part showing a partial cross section in the opened state, and FIG. FIG. 6 is an enlarged front view of the main part showing the relationship between the front leg and the rear leg when the leg is closed.

A folding chair according to the present invention has a backrest 4 which passes over the upper part as shown in the figure, and a front leg frame 1 having a substantially vertically elongated rectangular shape as a whole, and a right and left bent right and left bent. A rear leg frame 2 whose upper end is connected in the middle of the height of the front leg frame and is assembled in a character shape, and both side edges are passed halfway in the height of the front and rear leg frames 1 and 2 to be pivotally supported. It consists of three seats. Here, the front leg frame 1 and the rear leg frame 2 are made of a metal pipe material having an elliptical cross section, and are formed by bending each into a U-shape.

The front leg frame 1 has a central portion bent in a U-shape as a ground contact portion 1a, and portions rising up in parallel from both ends thereof as left and right front legs 1b and 1b, and a backrest frame (not shown) between both upper end portions. The backrest 4 is formed by wrapping the backrest 4 with a pad made of urethane foam resin, so as to form a vertically long rectangular frame as a whole.

On the other hand, the rear leg frame 2 has a central portion of an elliptical metal pipe cut shorter than the front leg frame 1 as a grounding portion 2a.
The left and right rear legs 2b, 2b are raised in parallel with each other, and the upper ends of the right and left rear legs 2b, 2b of the front leg frame 1 are bent.
It is connected to the front leg frame in the shape of a "person" by connecting it via a connecting rod serving as connecting guide means to be described later, facing the middle of the height of 1b.

The seat 3 is covered with a urethane foam resin so as to surround the metal frame (not shown) assembled in a substantially rectangular shape, and is formed into a thick elastic plate. The left and right front legs 1 of the front leg frame 1 are located substantially at the center of 3a.
b, 1b, are pivoted freely through a pivot pin 5 at the middle of the height, and the rear legs 2b, 2b of the right and left rear legs 2 of the rear leg frame 2 are pivoted behind the pivot position. 6 for pivoting connection with each other.

The rear leg frame 2 in this embodiment is wider than the width of the front leg frame 1 on the left and right, corresponding to approximately one elliptical metal pipe serving as a leg material.
The left and right rear legs 2b, 2b are located outside the b, 1b. And the front leg frame 1 is the left and right front legs 1
b, 1b are directly attached to both side edges 3a, 3a of the seat 3 and pivotally attached by the pivot pin 5 as described above, while the rear legs 2b, 2b located on the other side are formed in an L-shape, and the inner surfaces of the legs are formed. Pivoting piece 7 provided at the distal end thereof via a spacing metal fitting 7 erected from the
a is attached to the side edges 3a, 3a of the seat by a pivot pin 6 so as to be connected.

In the figure, reference numeral 8 denotes a connecting male member which constitutes the connecting guide means and also constitutes the friction resistance means, and 10 denotes a connecting female member which also constitutes the above-mentioned coupling guide means and constitutes one of the friction resistance means. Both male and female members are front legs 1b, 1
b and the upper ends of the rear legs 2b, 2b. One connecting male member 8 is provided with a transverse through-hole 12 at one end for passing a pivot pin 11, and the other end. A connecting rod 9 having a substantially elliptical cross-section extends from FIG.

The connecting male member 8 will be described in more detail. The connecting male member 8 has a rod-shaped connecting rod 9 as a core material, one end of which is bent into a U-shape, and the portion is crushed flat and the center is formed at the center thereof. A through hole for passing the pin 11 is formed, and this portion is further embedded in a synthetic resin to be integrated to form the whole. Then, the fitting portion 1 for attaching the sheath-shaped cover 13 to the end of the synthetic resin portion from which the connecting rod 9 extends.
4 are integrally provided and fitted.

On the other hand, the connecting female member 10 is fitted and attached to the openings at the upper ends of the left and right rear legs 2b, 2b of the rear leg frame 2, and the rod 9 is inserted along the axis. Then, the connecting male member 8 is connected.

The connecting female member 10 is required to be a tough material capable of withstanding the sliding of the connecting rod 9, but more specifically, has a certain degree of hardness and some elasticity, and has high wear resistance and a small friction coefficient. It is desirable to use a material having the resin, and therefore, a synthetic resin is also suitable as a material from the viewpoint of manufacturing and processing. still,
In this embodiment, a polyacetal resin is molded into a material.

Here, the connecting female member 10 is formed in a short rod shape adapted to the inner diameter cross section of the rear leg 2b, and one end (upper end) is in contact with the opening edge of the rear leg to prevent further intrusion. The connecting rod 9 is formed on the shaft center portion.
A through hole 16 is formed over the entire length.

Further, in this embodiment, the female member 10 is cut vertically from the front end (lower end) along the through hole 16.
7 is formed, and the distal end is divided into two forks to form an elastic piece 10
a, 10a are provided, and ridges 18, 18 protruding in a mountain shape are provided along the circumferential direction in the middle of the outer peripheral surfaces of both elastic pieces.

The through hole 16 formed in the connecting female member 10
Is formed to have a hole diameter substantially adapted to the cross-sectional shape of the connecting rod 9 so that a frictional resistance can be given to the connecting rod to be inserted when the connecting rod is slid in the inserting / removing direction.

The connecting female member 10 is mounted by forcibly pushing it into the opening of the rear leg 2b as described above. At this time, the elastic pieces 10a, 10b, The diameter is reduced by utilizing the elasticity of 10a, then pushed in, and forcibly pushed and attached together with the respective ridges 18, 18.

FIG. 11A is a central longitudinal sectional view of the connecting female member 10 before being fitted to the rear leg 2b. Here, it is shown that the through hole 16 has a tapered shape whose diameter gradually increases toward the distal end side.
This is a procedure for extracting the elasticity of the holes a and 10a, and may have the same diameter over the entire length of the hole. Although the cut 17 is U-shaped, it may be V-shaped or square.

On the other hand, FIG.
3B shows a state in which it is fitted to the opening of FIG. The bifurcated elastic pieces 10a, 10a are bent inward by ridges 18, 18 formed on the outer peripheral surface to substantially reduce the tapered through-hole 16 at that portion. The diameter.

Next, FIG. 11C shows a state in which the connecting rod 9 is inserted and connected to the fitted connecting female member 10. The connecting rod 9 inserted from one end of the through hole 16 penetrates the portion reduced in diameter by the ridges 18, 18, and the distal ends of the elastic pieces 10 a, 10 a are connected to the pillows 18, 18. And forcibly spread it out,
By this expansion, the elasticity at both ends is increased, and the pinch to the connecting rod 9 is strengthened to increase the frictional resistance.

In short, the ridge 18 serves as a pillow for the elastic piece portion 10a when the female member 10 is mounted, and serves to lift the tip thereof to exhibit elasticity. Although it is well formed in this case as a ridge, it may be a mere protrusion or a bulge.

The cover 13 having the shape of a sheath is attached to the rear leg 2.
is formed of a semi-rigid synthetic resin pipe material having substantially the same cross-sectional shape into which a can be inserted, and is formed on the fitting portion 14 of the connecting male member 8 on the inner peripheral surface of the opening at the upper end. A locking claw 20 for hooking the locking portion 19 is provided, and a notch 21 for cutting the inner surface vertically and receiving the base end of the spacing metal fitting 7 is provided in the lower end opening.

The cover 13 is attached to the upper end of the rear leg 2b when the front and rear leg frames 1 and 2 are closed.
The rear leg 2b is formed to have a sufficient length to cover the connecting rod 9 that is pulled out when the rear leg 2b is closed so as to be close to the front leg 1b. I have. When the cover 13 is mounted, the cover 13 is inserted through the distal end of the connecting rod 9 to fit the fitting portion 14.
Is inserted into the upper end opening portion, and is forcibly pressed to take advantage of the elasticity of the material so that the locking claw 20 on the inner surface is hooked and mounted on the locking portion 19.

In the drawing, reference numeral 22 denotes an elastic locking plate attached to the outwardly facing surface of the spacing member 7. This elastic locking plate 22
Is the rear leg 2 located outside when the front and rear leg frames 1 and 2 are closed
This is an interposition member for receiving the front leg 1b coming into the gap between the space holding bracket 7 and the front leg 1b, and performing frictional engagement while avoiding direct contact with the space holding bracket 7.

The elastic locking plate 22 shown in this embodiment is
b so as to cover the entire surface thereof along an inner surface (a surface facing outward when the seat 4 is the center) of the spacing metal fitting 7 formed in an L-shape extending from the inner surface of b. It is formed in an L-shaped plate.

The plate portion 22a attached to the pivotal attachment piece 7a of the spacing member 7 is provided with a raised portion 23 having a mountain-shaped cross section on the surface near the end, and the edge of the spacing member 7 is provided at the edge. An edge piece 24 surrounding the part extends. And the plate portion 2
Locking projections 25, 25 used for latching are provided facing each other inside the edge piece 24, which is located substantially in the middle of the upper and lower edges of 2a (see FIG. 8).

The elastic locking plate 22 is suitably made of a material having elasticity and a high friction coefficient, such as rubber or a soft synthetic resin. FIGS. 7 and 8 show this elastic locking plate 22 specifically. It is. The elastic locking plate 22 formed so as to conform to the shape of the spacing metal fitting 7 is covered so as to wrap the inner surface (substantially outward surface) of the holding metal fitting 7 so as to cover the edge piece 24. The locking projections 25, 25 provided on the inner side are fitted into and fixed to the concave portions 26, 26 formed by cutting out the upper and lower edges of the pivotally attached piece 7a.

When the elastic locking plate 22 is to be fixed, the elastic locking plate 22 is attached by using the elasticity of the material.
It is brought into close contact with the spacing metal fitting 7. Here, as shown in the figure, the upper and lower edges of the pivoting piece 7a of the spacing metal fitting are gradually narrowed toward the front end, and the plate portion 22a attached thereto is shifted in the tapered front end direction so as to engage with the locking projection. 25, 25 are strongly engaged with the recesses 26, 26 provided in the edge piece 24. Of course, it goes without saying that this attachment may be performed using an adhesive.

FIG. 9 specifically shows the mounting operation of the elastic locking plate 22. First, as shown in FIG. Plate part 22
a, the edge is surrounded by the edge piece 24, and
The engagement protrusions 25, 25 are fitted into the engagement protrusions 6, 26 to make close contact engagement. Thereafter, as shown in FIG.
Is attached to the base end of the spacing metal fitting 7, and the edge piece 24 surrounds the edge of the base end to complete the mounting.

In use, the folding chair is constructed as shown in FIGS.
Is opened in the shape of a human character, and the seat 3 is also tilted horizontally to enable seating. At this time, as shown in FIG. 4, the rear leg frame 2 pushes the connecting rod 9 of the connecting male member 8 deeply into the opening at the upper end of the rear leg 2b and directly abuts on the connecting male member 10, so that the front leg 1
The pivot 3 is kept closest to the pivot portion, that is, the pivot pin 11, to prevent further opening of the leg, and the seat 3 is held horizontally in a stable state.

Next, when the legs are folded and closed, the front edge of the seat 3 is lifted, and the pivot pin 5 with the front leg 1b is flipped up to the fulcrum, so that the rear leg 2b is rotated with the rotation of the seat. The pin 11 is rotated about the fulcrum, and is simultaneously folded while pulling out the connecting rod 9 from the connecting female member 10 in the upper end opening. And when the seat 3 jumped up is aligned with the front leg 1b, the rear leg 2
b is also aligned with the front leg 1b from behind, so that the three members are aligned in parallel and folded flat. At this time, the front leg 1b enters the inside of the rear leg 2b, faces the space holding member 7 and comes into contact therewith, so that further rotation is stopped.

At the time of the above-mentioned folding, the connecting rod 9 is pulled out from the through hole 16 of the female member 10. At this time, the connecting rod 9 is strongly sandwiched by the two divided pieces 10a, 10a, and these are combined. Since the resin is formed of a material, the connecting rod 9 is pulled out slowly due to frictional resistance, abrupt sliding movement is prevented, and the front and rear legs 1b and 2b are slowly closed. . Of course,
When the connecting rod 9 is inserted into the through-hole 16 as opposed to the drawer, this resistance also occurs, which slows down the movement.

On the other hand, when the connecting rod 9 is pulled out,
When the front leg 1b approaches the spacing member 7, the front leg 1b first has its inner side surface inside the pivoting piece 7a of the spacing member (that is, the outside surface when the seat 3 is the center).
And the elastic locking plate 22 attached to the pivoting piece 7a.
, So as to rub against the plate portion 22a, and at the same time, is pressed against the protruding portion 23 protruding from the plate portion 22a.

The dashed line in FIG. 10 shows the front leg 1 b before contacting the spacing metal fitting 7, and the two-dot chain line shows a state in which the front leg 1 b rides on the raised portion 23 of the elastic locking plate 22. At this time, the front leg 1b once spreads out by using the flexibility of the pipe material and rides on the raised portion 23. When the folding further proceeds from this state, as shown by the solid line, the front leg 1b climbs over the raised portion 23 and abuts against the plate portion 22b covering the base end of the spacing metal fitting 7, and stops at this position. At this point, the folding is completed.

In rubbing the front leg 1b and the space-holding metal member 7, when the bumper 23 comes into contact with the raised portion 23, the front leg 1b and the spacing member 7 are crushed by utilizing the elasticity of the front leg 1b. In this embodiment, as shown in FIG. 10, the distance between the outwardly facing surfaces of the pivotally attached pieces 7a, 7a of the left and right spacing metal fittings 7, 7, which are pivotally attached to the both side edges of the seat 3, is increased. Since the distance between the inner side surfaces of the front legs 1b, 1b is substantially equal, the left and right front legs 1b, 1b are pushed out by the thickness of the elastic locking plate 22 during this rubbing. The friction of the rubbing is increased, and the engagement between the two is strengthened.

Therefore, the front leg 1b that has passed over the raised portion 23
In this case, any return can be stopped by restoring the raised portion, or in this case, the front leg 1b is prevented from separating from the spacing metal fitting 7 by the frictional force of rubbing between the front leg 1b and the elastic locking plate 22. The legs before and after will be able to stop being opened without permission.

In the embodiment, the inner surface of the front leg 1b is slidably contacted with the pivoting piece 7a via the elastic locking plate 22 using the L-shaped spacer 7 so as to be locked. However, instead of this, for example, the spacing metal fitting is formed in a U-shape, one of which is a pivot piece, and the other piece is a mounting piece for the rear leg 2b, and the front leg 1b is inserted between the U-shaped metal fittings. The present invention can also be implemented by sliding the side surface of the front leg 1b into frictional engagement with either of the two pieces.

In this case, if the front leg 1b is brought into direct sliding contact with the spacing metal fitting, an abnormal noise is produced, the sound is damaged, and furthermore, the meshing becomes strong and the sliding contact becomes impossible. An elastic locking plate may be provided at least on the surface directly in contact with the front leg 1b and interposed therebetween to solve the above-mentioned problem.

Further, when the front legs are frictionally locked, the front legs may be brought into sliding contact with a flat elastic locking plate to be stopped by the frictional force of the material. Alternatively, this surface may be formed as a rough surface with irregularities so as to increase the engaging force to stop the free movement of the front legs.

[0048]

Embodiment 2 FIGS. 12 to 14 show a second embodiment of the present invention. In this embodiment, the pivot shaft 11 of the rear leg 2b, which is pivotally mounted in the middle of the height of the front leg 1b, slides into a sliding groove 31 provided along the longitudinal direction of the front leg 1b. This embodiment shows another embodiment in which the sliding groove is moved up and down by a guide to open and close the chair when the leg is opened and closed. In the description, the same portions as those in the first embodiment are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

The sliding groove 31 formed along the length direction of the front leg 1b is located at the position where the upper end of the rear leg 2b is located at the time of opening and closing, that is, at the position where the pivot pin 11 is located. The upper end 31a and the lower end 31b are set, and when the pin 11 contacts the upper end 31a, the leg is opened and the seat 3 is supported horizontally, and when the pin 11 contacts the lower end 31b, the leg is closed. It is folded.

The sliding groove 31 is formed on the outer surface of the front leg 1b. A frictional resistor 32 made of synthetic resin is fitted and fixed in the hollow portion of the front leg over the entire length of the groove 31. A groove 33 having substantially the same length is formed along the groove 31 in the resistor 32, and the pivot pin 11 that slides into the sliding groove 31 is fitted therein so as to be movable along the groove. is there.

The groove 33 is formed at the upper end 33 as shown in FIG.
a, the width is gradually reduced from the upper end 33a to the lower end 33b. When the pin 11 is slid from the upper end 33a to the lower end 33b formed substantially in accordance with the shaft diameter of the pivot pin 11, the resistance is gradually reduced. To make the sliding slow.

That is, in this embodiment, the pivoting pin 11 and the sliding groove 31 in which the pivoting pin 11 slides constitute linking and guiding means for the front and rear legs, and the resistor 32 and the groove 33 constitute frictional resistance means. When the front and rear legs 1b and 2b are opened and closed by the rotation operation of the seat 3, the pin 11 and the groove 33 rub against each other, causing resistance of the opening and closing operation, resulting in a slow operation.

In the figure, reference numerals 34 and 35 denote side edges 3a, 3 of the seat 3.
These are protrusions serving as frictional resistance means projecting one before and after "a". The protruding portions 34 and 35 project from the front leg 1b, which is provided close to the seat 3, at a height slightly greater than the interval between the front legs 1b. Seat 3
When the seat 3 turns and is folded, it rubs against each other when the seat 3 and the front leg 1b intersect with each other to provide resistance, thereby suppressing rapid turning of the seat.

Here, as shown in FIG. 13, when the seat 3 is completely folded and aligned in parallel with the front leg 1b, the front projection 34 extends beyond the raised center of the side surface of the front leg 1b. The front and rear projections 35 are located on the front side of the front leg and are engaged with the front leg 1b, so that the seat 3 optionally functions as a stopper so as not to rotate and open after the legs are closed.

Therefore, in this embodiment, the projections 34, 35
In addition to functioning as frictional resistance means, it also functions as restraining means for suppressing arbitrary rotation of the seat, thereby assisting safe operation. The projections 34 and 35 are seats 3
Molded from a synthetic resin that has a suitable rigidity and elasticity and is excellent in abrasion resistance, which is separate from the urethane foam resin that forms I'm making it. Of course, the resistance of the projection can be arbitrarily selected depending on its height and size, and a desired portion may be selected according to the design.

The embodiment of the present invention has been described above. In short, when the front and rear leg frames 1 and 2 are opened and closed, the seat 3
And between legs 1b and 2b, or between legs 1b and 2b
It is sufficient that frictional resistance means contacting with each other intersect at the intersection of the two, and abrupt opening and closing of the seat and the leg due to mutual friction can be avoided.

[0057]

As described above with reference to the embodiments, the folding chair according to the present invention, when opening and closing the front and rear legs frames, the frictional resistance means rubs the seat and the legs or the legs together, and the rapid rotation is achieved. It can be completely operated and handled because it avoids opening and closing, and when the legs are closed and folded,
Since the frictional resistance means refuse to open the legs arbitrarily, it does not open freely when carrying or storing and does not hinder the work, so that it can be handled safely and extremely conveniently.

[Brief description of the drawings]

FIG. 1 is a perspective view of a folding chair according to the present invention in which a leg is opened in a usable state.

FIG. 2 is a right side view in which a part of a chair in a spread state is omitted.

FIG. 3 is a right side view of a state where a part of the chair is omitted in a state where the legs are closed.

FIG. 4 is an enlarged right side view of a main part as a partial cross section in the open leg state.

FIG. 5 is an enlarged front view of a main part in a partially sectioned state in a closed state of the leg.

FIG. 6 is an enlarged front view of a partly omitted main part showing a relationship between a front leg and a rear leg in an open leg state.

FIG. 7 is an enlarged exploded perspective view of a main part.

FIG. 8 is an enlarged perspective view showing a relationship between a spacing metal fitting and an elastic locking plate.

FIGS. 9A and 9B are enlarged plan views for explaining a procedure for attaching an elastic locking plate to a spacing metal fitting.

FIG. 10 is an enlarged plan view illustrating the relationship between the front leg and the rear leg and the engagement relationship between the front leg and the spacing metal fitting.

11A and 11B show a relationship between a rear leg and a connecting female member and a relationship between a connecting rod and a connecting rod, wherein FIG. 11A shows a state before the connecting female member is mounted, FIG. 11B shows a mounted state, and FIG. FIG. 5 is an enlarged cross-sectional view showing a state in which a connecting rod is inserted through the connecting rod.

FIG. 12 is a side view of a main part of the second embodiment in an open leg state.

FIG. 13 is a side view of a main part in a folded closed leg state.

FIG. 14 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front leg frame 1b Front leg 2 Rear leg frame 2b Rear leg 3 Seat 3a Side surface of seat 4 Backrest 5,6 Pivot pin 7 Interval holding metal 7a Angular attachment piece of interval holding metal 8 Connecting male member 9 Connecting rod 10 Connecting female Member 11 Pivot pin 13 Sheath-shaped cover 14 Fitting portion 16 Through hole 22 Elastic locking plate 22a Plate portion of elastic locking portion 23 Raised portion 25 Projection 26 Depressed portion 31 Sliding groove 32 Resistor 33 Slide the pin Grooves 34, 35 Projections serving as frictional resistance means

Claims (2)

[Claims] 1. A front leg frame which supports a backrest between upper ends of left and right front legs, and upper ends of the left and right legs which are formed in a substantially U-shape and are parallel to each other at a height of the left and right front legs. A rear leg frame that is connected and assembled in a character shape, and pivotally pivotally attached to the front leg and the rear leg respectively at two points in front of and behind the left and right side edges by passing in the middle of the height of the front leg frame and the rear leg frame. When the seat is folded, the front edge of the seat is flipped up and pivoted about a pivot point with the front leg at a fulcrum, and the rear leg is pulled down and aligned with the front leg while being flat. In use, the front edge of the seat is pushed down and the pivot point is pivoted about the pivot point with the front leg at the time of use, and at the same time the rear leg is raised and the upper end of the leg is fixed to the front leg. In a folding chair, the legs are opened in the shape of a human character and the seat is horizontally supported and seated, A frictional resistance means is interposed between the side edge of the seat that intersects with the rotation of the seat and any one of the front and rear legs, or at the intersection between the front and rear legs, and when the legs are opened and closed, A folding chair characterized in that the seat and the leg or the leg are in frictional sliding contact with each other to suppress rapid rotation of the leg and the seat. 2. A folding chair according to claim 1, wherein the frictional resistance means is inserted between the front leg and the upper end of the rear leg which is connected to the middle of the height of the front leg. A folding chair comprising a connecting guide means comprising a female connecting member, wherein the male and female connecting members are rubbed against each other when the legs are opened and closed to suppress a sudden opening and closing movement.