KR101373586B1 - Method for amking Steel seat and Chair - Google Patents

Abstract

The present invention is a method of manufacturing the seat plate of the chair by curling the edge of the iron plate, cutting process to make a processed iron plate having a curling portion on the four sides by cutting as much as the part to be removed when curling at the four corners of the square iron plate, The processed steel sheet is pressed between the female mold formed on the four sides and the corners of the four sides and the first mold having the male mold having the convex portion formed at the portion corresponding to the recessed groove of the female mold, and the curling portion is pressed in the center of the processed steel sheet. The first bending process to be bent in a curved direction with respect to the plane to stand in a vertical direction, and the end of the curling portion, which is erected in the first bending process, is placed in a second mold formed with a concave groove and a convex portion, and pressed to form an inner concave curved surface. A secondary bending process formed at an end portion, a pipe attaching process for attaching a circular reinforcement pipe in a concave curved surface formed at the curling portion, and a pie The reinforcement pipe is made by using a female mold having a concave groove for accommodating a curling part attached to a rod, and a third mold having a male mold formed so that the concave surface protrudes so as to correspond to a curved surface formed at the center plane and the corner of the steel plate. And a third bending process of pressing the attached steel sheet to form a curling portion in which a reinforcing pipe is embedded at the edge of the steel sheet.

Description

Iron chair and seat plate manufacturing method {Method for amking Steel seat and Chair}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a steel chair and a seat plate manufacturing method thereof, and more particularly, to a method of manufacturing a chair in which curled corners are rounded and mechanical strength is firm.

The chair is made of different materials. Although wood chairs have a long origin, there are chairs made of plastic materials, and chairs made of a mixture of iron and wood plastics. Steel chairs are widely used because of their long lifespan and their easy-to-break properties.

Chairs that are installed in places that are used by several people should be of a structure that can provide a firm yet comfortable structure.

For example, chairs installed in lounges, parks, etc. are mainly made of wooden bench chairs, and more comfortable benches or single chairs are installed in the lobby of hospitals and government offices.

Such chairs used in rest rooms or lobbies generally use steel chairs in which the seat plate and the back of the chair are integrated in order to manufacture a sturdy structure so that there is no breakdown.

Chairs formed by integrally the backrest and the seat plate are generally called high-pack chairs.

Application No. 10-2004-0066220 In the "High Pack Chair Manufacturing Process", both surfaces of wood turned to 0.5 ~ 0.7mm or less are coated and dried to obtain a single plate. Pattern sheet paper manufacturing process obtained by coating and impregnating melamine-modified resin after printing, etc., Combination process of laminating and pressure-bonding the pattern sheet paper on the upper surface of the top plate of compressed reinforced wood board material obtained by laminating a plurality of sheets. And thermosetting resins obtained by co-condensing melamine-based resins and phenolic resins in a 20-80 g / cm2 patterned sheet of paper in a molding process and a cutting process of inserting and molding into a molding mold to obtain a molded product. The resin penetrates and impregnates the front layer and the back layer of the pattern sheet through a steel roll so that a penetration layer is formed to protrude to a certain degree. The manufacturing process of integrally forming a seat plate and a backrest is disclosed.

Legs for supporting the seat of the chair are widely known to have a height adjustment function, a rotation function, a lying down function, and the like from the structure of simply attaching four legs to the seat plate.

The chair structure for supporting the seat plate and the backrest with the steel plate is disclosed in Utility Model Application No. 1983-5812, "Seat of the Chair," which has an upper part of the back plate (a) and the middle part (b) having an air tube embedded on the bent support plate And a structure in which rubber wrinkles are formed in the front part c of the seat, respectively.

Registration number 20-0393102, filed May 31, 2005, filed application number 20-2005-0015414, and published on August 17, 2005, discloses a seat for a prefabricated chair, with appropriate intervals. In the seat plate is formed with a plurality of holes, the curling 12 to be rolled back to the upper and lower and both edges and each corner is formed integrally.

Patent Application No. 20-2005-0015413 Patent No. 20-0393011 also discloses a "board seat for the prefabricated chair," which is curled on the edge of the seat plate, respectively, even if the structural strength of the seat plate is greatly reinforced, In order to prevent deformation in advance, in the seat plate formed with a plurality of holes at appropriate intervals, curling curled to the rear of the seat plate at the top, bottom and both sides of the seat plate, respectively, each groove of the seat plate Forming a curling to form, the seat plate for the prefabricated chair is fixed by screwing a pair of first and second coupler respectively separated into two in the groove.

Application No. 20-2005-0015414 "Prefabricated chair seat plate" is a mechanical strength is weak and easily deformed, the edges are sharpened to tear the user's clothes or hurt the skin was incomplete to use the problem.

Application Nos. 20-2005-0015779 (20050602), 20-2005-0015561 (20050601), and 20-2005-0015415 (20050531) are also applications related to seat plates for prefabricated chairs filed by the same inventor, to supplement mechanical strength. Various support structures have been proposed for this purpose.

The conventional "prefabricated chair seat" proposed so far has a problem that the mechanical strength is recognized as a problem is weak and easily deformed, and that the iron plate of the corner portion is deformed and sharpened, to solve this problem, Fasteners were used.

Thus, a chair using a conventional steel seat plate still has a problem of using first and second couplers at each corner.

In order to increase the mechanical strength, it is necessary to use a thick steel sheet, which makes curling difficult, heavy, and expensive, resulting in a problem of being uncompetitive for chairs using other materials.

The present invention is to provide a method for manufacturing a steel seat plate for a chair that solves the problems of the seat plate of a conventional iron plate material.

The present invention is to provide a manufacturing method for making a seat plate having a sufficient strength as a chair while using a thin iron plate.

The present invention seeks to provide a curling method for rounding the edges and corners of an iron plate.

The present invention is to provide a method for curling by embedding a reinforcement pipe when curling round the steel plate edges and corners.

The present invention is a method for manufacturing a seat plate of the chair by curling the edge of the iron plate, the four corners of the square plate to be removed during curling, that is, cutting the corner portion to make a processed iron plate having a curling portion on the four sides Between the cutting process and a first mold consisting of a male mold having a convex curved surface at four sides and a corner portion and a female mold receiving the male mold, the steel sheet is pressed and the curling portion is curved with respect to the center plane of the steel sheet. The first bending process to be bent in the vertical direction to stand in the vertical direction, and the end of the curling portion erected in the first bending process is put into a second mold formed with concave grooves and convex portions and pressed to form an inwardly concave curved surface at the end of the curling portion A secondary bending step, a pipe attaching step of attaching a circular reinforcement pipe to a concave curved surface formed in the curling part, and a pipe The reinforcement pipe is made by using a third mold having a female mold having a concave groove to accommodate the attached curling part and a male mold pushing the center plane of the processed steel sheet, or a male mold pushing the curved surface formed at the center plane and the edge of the processed steel sheet. And a third bending process of pressing the attached steel sheet to form a curling portion in which a reinforcing pipe is embedded at the edge of the steel sheet.

The present invention is to weld the edge of the curling portion formed in the third bending process to harden and to prevent the tearing of the corners, to form a curling portion by making the processed iron sheet into a rectangular shape, the middle portion of the rectangular bending the chair at a predetermined angle It includes a bending process of forming the back of the chair integrally connected to the seat plate of the.

The present invention further includes a punching process of forming a plurality of small holes in a portion of the processed steel sheet, and a pressing process of forming a reinforcing portion for reinforcing the binding force of the steel sheet when the seat plate of the chair is coupled to the chair leg or the support. . And the reinforcement part includes a step of welding and pasting the reinforcement bar corresponding to the shape of the reinforcement part.

Chair of the present invention is made by combining the legs or the support member to the seat plate manufactured by the manufacturing method of the present invention as described above. And it is possible to make a chair to be used comfortably by attaching a thermal insulation / cushioning member that insulates or cushions the seat and back as needed.

The present invention also applies to the method of curling by putting a reinforcing pipe at the edge of a general iron plate having a corner portion.

In the chair of the present invention, curling is formed on the edge of the seat plate, so that the strength of the seat plate is greatly strengthened, and the seat plate is coupled with the leg or the support through the reinforcement of the reinforcement part, thereby preventing the seat plate from being warped or deformed during use.

The seat plate of the present invention is firm and smooth because each corner is smoothly and neatly processed through curling and welding, and does not tear the user's clothes or damage the skin.

The seat plate of the present invention is very advantageous for mass production since the process is simplified compared to the prior art.

The seat plate manufactured by the manufacturing method of the present invention and the chair using the same are solid and have a long service life, and are easy to repair even if broken, economically advantageous, and resource saving effect is large.

1 is a perspective view of a chair using a conventional iron seat.
2 is a longitudinal cross-sectional view of the seat plate of FIG. 1,
3 is a plan view of the steel plate, the right portion is an enlarged view of the corner portion.
4 is a partial cross-sectional view of the first mold cut by the cutting line AA or BB of FIG. 5.
5 is a view schematically showing a plan view or a bottom view of a female mold or a male mold.
6 is a view showing a cross section of the finished steel sheet after the first bending process.
7 is a view showing a partial cross section of the second mold.
8 is a view showing a cross section of the finished steel plate after the secondary bending process.
9 is a view showing a cross section of the steel plate in the state of completing the pipe attachment process.
FIG. 10 is a partial cross-sectional view of the third mold cut by the cutting line AA or BB of FIG. 5.
11 is a view showing a cross section of the finished steel plate after the third bending process.
12 is a perspective view showing a state before forming the film after the finished steel sheet has finished the process of the present invention.

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

The present invention relates to a method for producing a seat plate and a backrest, or a seat plate or a backrest of an iron chair, and a chair manufactured by the method.

First, as shown in Figure 3, in the raw material for producing the seat plate, the cut to a size that can be the seat plate by curling. Before curling, four corners of the four-sided iron plate are cut and removed by the edge removing portion 101 to be removed when curling, and the four sides of the steel plate 100 having the curling part 102 are made. The curling part 102 refers to a portion indicated by a dotted line at the four side edges of the steel plate 100 in FIG. 3. In addition, the edge removing portion 101 to be removed during curling is a portion where the edge portion overlaps when the curling portion rolls up the pipe shape so that the curling process can be smoothly performed when the curling portion is formed into a pipe shape. In order to cut in advance to remove the part to be cut in advance before the curling process, cutting as shown in Figure 3, the edge removing portion 101 is cut. This edge removal portion 101 is cut to the pipe bent at right angles and unfolded in a flat form without a corner portion, the difference between the shape and the right angled iron plate is a corner removal portion. In this process, it is simpler to cut a single punch to form a processed iron sheet from a wide iron plate.

Next, in order to be curved from the position where the curling part starts in the center plane of the iron plate, a working iron plate is inserted between the female mold and the male mold of the first mold and pressed by a press to the center plane 104 of the processed steel plate 100. The first bending process is performed such that the curling unit 102 is bent in a curved direction to stand in a direction substantially perpendicular to the center plane. At this time, the first mold to be used, as shown in Figs. 4 and 5, accommodating the female mold 110 and the female mold having a small curved surface or an almost right angled receiving portion 111 formed at four sides and corner portions. The male mold 120 has a convex portion 121 formed at a portion corresponding to the portion 111. Here, the female die 111 has a sufficient free space for accommodating the convex portion of the male mold, so that the desired pressing process is performed. When the working iron plate is inserted between the female mold and the male mold of the first mold and pressed, the curling portion is bent in a curved surface with respect to the center plane of the processed steel plate, as shown in FIG.

A secondary bending process is performed to bend the end of the curling portion 102 erected in the primary bending process back into the curved surface. In this process, the second mold, such as the mold cross section shown in FIG. 7, that is, the female mold 133 having the concave groove 134 formed at the lower portion thereof and the male mold 131 having the convex portion 132 formed at the upper and lower corners thereof. In the second mold, the end of the curling section 102 erected in the primary bending process is inserted, that is, the process intermediate product in which the primary bending process is completed as shown in FIG. 131) When the female mold is pressed onto the male mold on four sides, a curved surface 136 is formed inwardly at the end of the curling portion, as shown in Fig. 8. The process intermediate product shown in Fig. 8 is a secondary bending process. Show it later turned over.

Next, a pipe attaching step of attaching a pipe 140 having an outer diameter corresponding to the curvature of the inner curved surface of the curling portion bent to a curved surface is performed in the second bending process. This pipe is a reinforcing pipe that increases the mechanical strength of the seat plate and uses a pipe with a length that matches the length of one side of the seat plate. In this step, the pipe may be attached to the curved surface of the curling portion by spot welding as shown in FIG. 9, but may be attached using an adhesive without welding.

Next, a third bending process is performed using a third mold to complete curling around the reinforcement pipe. As shown in FIG. 10, the third mold includes a female mold 142 having a concave groove 145 to accommodate a curling part to which a pipe is attached, and an outer curved surface 137 formed at the center plane 104 and the edge of the steel plate. In order to correspond to the concave surface 144 has a male mold 143 formed in the protrusion 147. If there is a protrusion 147 in the male mold 143, the press work is safe but the protrusion 147 is not necessarily required. If the strength of the steel plate is strong, the male mold without the protrusion 147, that is, a flat plate is used. Work may also be desired. Therefore, the protrusion 147 in the male mold 143 is not an essential component. The third mold is used to squeeze the processed steel plate to which the reinforcing pipe 140 is attached, that is, flip the process intermediate product shown in FIG. 9 so that the curling portion is coupled to the female mold groove 145, and then the male mold 143 is formed. Pressed from the top to the bottom, as shown in the cross section shown in Figure 11, to complete the process of forming a curling portion (102 ') with a built-in reinforcement pipe 140 is built in the edge of the steel plate.

When the female mold and the male mold of the third mold are pressed to be bonded to each other, the curling portion, in which the pipe is attached, is mounted in the third mold and the press is operated by turning the processed iron plate upside down in the state shown in FIG. 9. Drying in 145) and eventually curling to the state shown in FIG. At this time, since the edge removal portion 101 of the processed steel sheet as shown in Figure 3 is gone, both curling parts are narrowed by the edge removal portion 101 cut out when both curling portions are curled in the step of curling is completed. Will come into contact with each other. The entire edge of the steel sheet is thus rounded, ie all the edges of the steel sheet are curled.

Since the seat plate manufactured by completing the 3rd bending process is in contact with the curling part of both sides at its edge part, the steel plates around the reinforcement pipe are designed to be in close contact with each other. Can be. Therefore, the welding process is carried out to connect the curling parts of both sides integrally while filling the gap completely. This welding in Figure 12 can be identified by welding the edges attached to the gap.

And even if it is welded to some degree, it is necessary to process a corner part smoothly in order to improve the quality of a product, and to grind this part.

If the seated plate is used as a seating chair, it can be used as it is.However, in order to use it as a chair with a backrest, the processed steel plate is made into a rectangular shape from the beginning to form a curling part, and the middle part of the rectangle is bent at a predetermined angle. Perform a bending process to form the back of the chair integrally connected to the seat plate of the.

This bending process is good to make the user's waist feel the most comfortable, so it is good to form the "S" shape by bending twice so that the back part extends backward and the waist part comes forward.

In addition, in order to improve the air permeability of the steel sheet, it is preferable to form a plurality of small holes in a part of the processed steel sheet to be backed. This step is preferably punched before and after the cutting step.

In addition, when the seat plate is combined with the legs or the support of the chair only when combined with the iron plate itself is weak strength easily broken, when combining the seat plate of the chair with the chair leg or support to form a reinforcement for reinforcing the binding force of the iron plate. This reinforcement part adds a press process after the process of cutting the steel plate to form a place to attach the reinforcement bar, and combines the reinforcement table 150 corresponding to the shape of the reinforcement part. The reinforcing bar may be combined with the support by using only the reinforcing bar.

When the seat plate 170 attached to the reinforcement stand is coated with a protective film by a painting process through a pretreatment process, the seat plate 170 is combined with a chair leg or a support, thereby being used.

The iron plate is manufactured by combining a leg or a support member to the seat plate manufactured in the above manner as in the conventional art. When iron is in direct contact with a person, it feels cold, so it is better to make a chair by attaching an insulation / cushion member that insulates or cushions the seat and back as needed.

Iron plate curling method of the present invention can be used when producing a curled product with a corner, it can be used to curl the corners can see a good effect.

100: steel plate
102: edge removal portion 104: center plane
102, 102 ': curling portion 111: accommodating portion
110: female mold 120: male mold
121: convex portion 131: male mold
136: Surface 137: Surface
132: convex portion 134: concave groove
140: reinforcement pipe 142: female mold
143: male mold 144: concave surface
145: recessed groove 147: protrusion
150: reinforcement 170: seat

Claims (8)

A method of manufacturing a seat plate of a chair by curling an edge of an iron plate,
A cutting process of cutting the corner removing portion 101 from four corners of the square iron plate to make a processed iron plate 100 having a curling portion 102 on four sides;
The processed iron plate 100 is placed on a female mold of a first mold including a male mold having a convex curved surface at four sides and a corner portion, and a female mold formed in a shape corresponding to the male mold to receive the male mold. A first bending process in which the curling portion 102 is erected in a vertical direction with respect to the center plane of the steel plate,
Primary bending between the female mold and the male mold of the second mold having a male mold 133 having a concave groove 134 formed at a lower portion thereof and a male mold 131 having a convex portion 132 formed at upper and lower edges thereof. A secondary bending step of inserting and crimping an end portion of the curling part 102 erected in the step to form a concave curved surface inwardly,
A reinforcing pipe attaching step of attaching a circular reinforcing pipe in a concave curved surface formed in the curling portion;
Female steel mold having a concave groove to accommodate the curling portion to which the reinforcement pipe is attached, and a reinforced steel sheet between the female mold and the male mold of the third mold having a male mold for pushing the center plane of the processed steel sheet. And pressing, forming a curling part in which a reinforcing pipe is embedded at an edge of the processed steel plate. The method according to claim 1,
The seat plate manufacturing method characterized in that the addition of a welding process for welding the gap between the curling portion in the longitudinally curled portion formed in the third bending process. The method according to claim 1,
A method of manufacturing a seat plate, characterized by adding a bending step of forming a curled portion by forming a processed iron plate into a rectangular shape, and bending a middle portion of the rectangle at a predetermined angle to form a backrest of the chair integrally connected to the seat plate of the chair. The method according to claim 1,
A punching process of forming a plurality of small holes in a portion of the processed steel sheet;
In order to reinforce the binding force of the iron plate to the seat plate portion of the chair when the seat plate of the chair is coupled to the chair leg or the support, the seat plate is characterized in that the addition of a press process for forming a reinforcement portion in the portion to the chair leg or support of the seat plate Manufacturing method The method of claim 4,
Method for manufacturing a seat plate, characterized in that for adding the step of welding the reinforcing table 150 corresponding to the shape of the reinforcing part by welding. An iron chair made by combining a leg or a support member with a seat plate manufactured by the seat plate manufacturing method according to any one of claims 1 to 5. The method of claim 6,
An iron chair characterized by attaching an insulating / cushion member that keeps or cushions the seat plate and the backrest. A method of curling the edge of an iron plate with rounded corners,
A cutting process of cutting the corner removing portion 101 from four corners of the square iron plate to make a processed iron plate 100 having a curling portion 102 on four sides;
The processed iron plate 100 is placed on a female mold of a first mold including a male mold having a convex curved surface at four sides and a corner portion, and a female mold formed in a shape corresponding to the male mold to receive the male mold. A first bending process in which the curling portion 102 is erected in a vertical direction with respect to the center plane of the steel plate,
Primary bending between the female mold and the male mold of the second mold having a male mold 133 having a concave groove 134 formed at a lower portion thereof and a male mold 131 having a convex portion 132 formed at upper and lower edges thereof. A secondary bending step of inserting and crimping an end portion of the curling part 102 erected in the step to form a concave curved surface inwardly,
A pipe attachment step of attaching a circular reinforcement pipe to the concave curved surface formed on the curling portion;
A reinforcement pipe between the female mold and the male mold of the third mold having a female mold having a concave groove to accommodate the curling portion to which the reinforcement pipe is attached, and a male mold that pushes a curved surface formed at the center plane and the edge of the processed steel sheet. The method of manufacturing a seat plate comprising a third bending step of inserting and pressing the processed iron plate is attached to form a curling portion with a reinforcement pipe embedded in the edge of the processed iron plate.

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