JPH0227799Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a chair, specifically a foldable chair.

Conventional folding chairs can be seen, for example, in Utility Model Application Publication No. 10703 of 1929 or Publication of Utility Model Publication No. 1983-4892, but both of them mainly have multiple leg rods in the front and rear consisting of vertical rods. It has a structure in which an X-shaped frame rod is connected between the main bodies as a linking member for the folding operation.

However, in the above conventional structure, there are many constituent members, which is inconvenient for assembly and manufacturing.In addition, in order to absorb the change in the length of the X-shaped frame rod or leg rod when folding, an auxiliary link is connected to the X-shaped frame rod. Alternatively, the main body of the leg rod had to be made into a double-tube structure that could be extended and contracted, which made the structure more complicated and resulted in poor manufacturability.

In view of these conventional circumstances, the present invention has been developed to create a multi-chair that uses the X-shaped frame rod itself as a leg rod with a load-bearing structure, improves assembly workability using brackets, and can be folded compactly. The purpose is to provide

In the chair of the present invention, the center portions of two bars of equal length are rotatably supported to form an X-shaped frame rod, and the ends of each of the adjacent frame rods are made of a flat plate. A support piece consisting of a vertical wall is rotatably connected to the support piece of a bracket integrally protruding in at least three directions on one side of a shaped substrate to form a four-sided frame, and the four-sided frame is connected to the frame rod and the support piece of the bracket integrally projecting in at least three directions. The present invention is characterized in that a plurality of brackets are shared and arranged in parallel to form a leg frame with the brackets arranged at each upper and lower end, and a foldable seat is attached and laid on the upper bracket of the leg frame.

To explain the present invention with reference to embodiments, Fig. 1 is a perspective view showing the embodiment in use as a chair, and Fig. 2 is a perspective view of the embodiment when it is unfolded slightly from its smallest folded state. , shows an example of a leg frame structure in which three four-sided frames A are connected in parallel.

The four-sided frame A is constructed of a frame rod 20 formed by two rods 1, 1 and a pin 2 on each circumferential surface of the four-sided frame A, that is, on each of the four continuous peripheral surfaces excluding the top and bottom surfaces.

The frame rod 20 is an X-shape formed by rotatably supporting the center of two rods 1, 1 of equal length with a pin 2, and is formed of a metal tube or the like.

The four-sided frame A is formed by four X-shaped frame rods 20, 20... disposed on its four sides, and the frame rods 20, 20 constituting the adjacent surfaces are formed by the respective bars 1, 1, 1, 1.
The ends are butted together and rotatably connected to form a four-sided frame.

This embodiment has a frame structure constructed by three four-sided frames A, A, and A by connecting the four-sided frames A in the side direction thereof, and the frame rods 20 constituting the connected side surfaces are common. shall be.

The lower part of the connecting part of each of the bars 1, 1 is connected by a lower bracket, and the upper part is connected by an upper bracket, and the lower bracket 3 has a structure in which support pieces 4, 4, . That is, it has a structure in which supporting pieces 4, 4, . The lower bracket 3 has a shaft hole 6 in its center and mounting holes 7, 7, . . . in its four corners, and can be used depending on the usage mode.

The upper bracket 3' has a similar structure to the lower bracket 3 described above. It has a structure in which support pieces 4', 4'... are protruded in a cross shape, and the end of each bar 1 is rotatably attached to each support piece with a pin 5, and attachment holes 7' are provided at the four corners. However, the shaft hole 6' provided in the center is larger than the shaft hole 6, and is provided so that the support column 8 or the back support column 9 is loosely fitted therein.

The lower end of the column 8 is fixed to the center of the lower bracket 3 by a tightening screw 16 passing through the shaft hole 6. The support column 8 is inserted into the shaft hole 6 of the upper bracket 3'.
' and passes through the eyelet metal 10 provided around the seat a, so that it protrudes appropriately from the seat when used as a chair, and the armrest b is fixed to the tip with a stopper 13. be done.

Similarly, the lower end of the back column 9 is fixed to the center of the lower bracket 3 by a tightening screw 16 passing through the shaft hole 6. And the back support 9 is connected to the upper bracket 3.
It fits loosely into the shaft hole 6 of the seat a, passes through an eyelet fitting 10 provided around the seat a, and projects longer than the support column 8 so that the backrest c can be attached thereto. A screw hole is provided on the back support 9 at the same height as the support 8 so that an armrest b can be attached thereto, and a hole for attaching the backrest c is provided above the screw hole.

Each of the above members constitutes a leg frame as a chair, to which a seat a, an armrest b, and a backrest c are attached.

The sheet a is formed of cloth or the like into a rectangle that is slightly larger than the rectangle formed by connecting three four-sided frames A, and each long side thereof is folded back to an appropriate length. Holes 17 are provided at equal intervals in each folded portion so that the struts 8 or the back struts 9 are fitted into each folded portion, and a reinforcing cloth 7 is overlaid in each of the holes so as to have one side equal to the folded width of the sheet a. It is formed into a square, and the hole 17 is provided with an equal hole in the center thereof.

The eyelet fittings 10 simultaneously eyelet the holes in the sheet a and the reinforcing cloth 7 to prevent damage to the sheet a. The sheet a is connected together with the reinforcing cloth 7 to the pillars 8, 8, back pillars 9, 9 through the eyelet fittings 10.
. . . and stacked on top of the upper bracket 3'.

The armrest b is made of cloth or the like and is slightly shorter than the short side of the sheet a, and its front end is folded back to an appropriate length and has a hole through which the stopper 13 passes. The other end is folded back to form a loop connected to the support fitting 11 and fixed with a rivet 18. The front end of the armrest b is fixed to the top end of the column 8 by a stopper 13, and the other end is fixed to the screw hole of the back column 9 provided at the same height as the column 8 through a support 11 with a washer 1.
2. Fixed by nut 19. Further, the armrests b of adjacent four-sided frames A are common.

The backrest c has a band shape slightly shorter than the long side of the seat a, and is made of cloth or the like, each end of which is folded back to an appropriate length and sewn together to form a loop that fits into the back support 9. Ru.
Further, a small piece c' having the same width as the backrest c is sewn to the backrest c to form a loop that fits into the common back supports 9, 9 of the four-sided frames A, A, A, respectively. The backrest c has back supports 9, 9...
and are fixed with rivets 15 with washers 14 interposed at the front and rear.

To explain the expansion and contraction of the above embodiment, the entire four-sided frame A expands and contracts in a similar manner as the bars 1, 1 of the frame rod 20 rotate around the pin 2 for opening and closing operations. For details, refer to the lower brackets 3, 3... and the upper brackets 3', 3'... at the four corners of the four-sided frame A.
move toward the center of the four-sided frame A in the radial direction. In the leg frame of the embodiment, the four-sided frames A are rotatably connected, so by moving one part of the leg frame, the four-sided frames A, A, A are interlocked. Comparing and explaining FIG. 1 and FIG. 2, if the embodiment is contracted in the longitudinal direction, the four-sided frame A will be similarly contracted and the
As shown in the figure, it also contracts in the front and rear directions, allowing it to be folded into a small size. Further, since the seat a, the armrest b, and the backrest c are made of a foldable material such as cloth, they are folded together with the folding of the leg frame.

In addition, in the above embodiment, the column 8 and the back column 9
However, they are not load-bearing members mainly consisting of leg levers, and if the armrests b and backrest c are not required, the members 8 and 9 may be optionally omitted.

Since the present invention is constructed as described above, the leg frame expands and contracts each four-sided frame in a similar manner, allowing the chair to be folded simultaneously in the longitudinal direction and the depth direction, and its folding form is superior to that of conventional multi-chairs. It is extremely compact, requires less storage space, and is easier to transport.

In addition, since the X-shaped frame rod itself is the main leg rod, there are fewer components and a simpler structure compared to the conventional structure mentioned above, which significantly improves the ease of assembling the chair.Furthermore, the support pieces protrude in at least three directions. Since a bracket is used and the end of the bar constituting the frame rod is rotatably connected to the support piece of the bracket, the ease of assembling the bars and the adjacent frame rods is improved and work efficiency is improved. Moreover, even when the support column 8 and the back support column 9 are required, they can be easily attached using the bracket.

In addition, since the above-mentioned bracket is formed by integrally forming a support piece consisting of a plurality of vertical walls on one side of a flat board, even if the board itself is a thin plate, it is reinforced by the support pieces and its strength is increased, and the strength of the plastic molded product is increased. The flat plate surface increases the installation area, provides a stable leg frame for the frame, and makes the attachment of the sheet to the upper bracket more secure.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention in use as a chair, FIG. 2 is a perspective view showing its folded state, and FIG. 3 is a vertical side view of FIG. 1. In the figure, 1 is a bar, 2 is a pin, 20 is an X-shaped frame rod,
A is a four-sided frame, and a is a sheet.

Claims (1)

[Scope of utility model registration request] The central parts of two bars of equal length are rotatably supported to form an X-shaped frame rod, and the ends of each of the adjacent frame rods are attached to one side of the flat board from a vertical wall. A four-sided frame is formed by rotatably connecting support pieces to the supporting pieces of a bracket integrally projecting in at least three directions, and a plurality of four-sided frames are connected in parallel by sharing the frame rods and the brackets. The chair comprises a leg frame with the brackets arranged at each upper and lower end thereof, and a foldable seat is attached to the upper bracket of the leg frame.