KR100739832B1 - A bedstead leg and method thereof - Google Patents

Abstract

A bedstead leg and a manufacturing method thereof are provided to improve assembly and productivity by preparing a part for connecting members constituting a frame and a part for supporting the frame as a single integrated extruded material. The bedstead legs connect members constituting each side of a frame and have an L-shape to support the frame and the ground. To form the leg(10), a core(40) is inserted into an extruding mold(30), a melting resin is injected into a forming space(50a) that is formed between the extruding mold(30) and the core(40) to manufacture a single integrated extruded material. In the single integrated extruded material, an upper part is shut off, a lower part is open and a hollow portion corresponding to the shape of the core(40) is formed inside. The width of the hollow portion becomes greater as it goes toward a lower part thereof.

Description

[0001] DESCRIPTION [0002] A BEDSTEAD LEG AND METHOD THEREOF [0003]

1 is a perspective view illustrating a structure of a leg of a bed according to a preferred embodiment of the present invention.

FIG. 2 is a perspective view illustrating a structure of a leg of a bed according to a preferred embodiment of the present invention, in which one side is cut away.

3 is a plan sectional view showing a state in which a molten resin is injected into a molding space formed between an injection mold and a core in a process of manufacturing a bed according to a preferred embodiment of the present invention.

4 is a cross-sectional view of a recessed portion showing a state in which a molten resin is injected into a molding space formed between an injection mold and a core in a process of manufacturing a bed according to a preferred embodiment of the present invention.

FIG. 5 is a cross-sectional side view showing a state where a molten resin is injected into a molding space formed between an injection mold and a core in the process of manufacturing a bed according to a preferred embodiment of the present invention, It is what I have seen.

6 shows the operation of removing the core by drying the molding in the state of FIG.

Description of the Related Art [0002]

10: leg 10a: hollow portion

10b, 10c: insertion hole 10d: fastening hole

11: upper plate part 12: inner plate part

13: outer plate portion 14, 15: end plate portion

20: first mold 30: second mold

33: protrusion 40: core

50: Molded product 50a: Molding space

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg for a bed and a method of manufacturing the same, and more particularly, to a leg for a bed in which a portion connecting the members forming the frame and a portion supporting the frame are formed as a single integral body.

Generally, the bed comprises a frame forming a frame, a pallet installed inside the frame, and a metris installed to be supported on the pallet.

The frame is provided with a headboard, a hood plate provided on the opposite side of the headboard, and a pair of side plates such as a pair of side plates provided between the headboard and the hood plate.

In such a frame, a leg is provided between the respective members so as to support the frame while connecting them. When the lower end of the headboard is extended to the bottom so as to be supported on the ground, the lower end of the headboard functions as a leg. At this time, the end of the sideboard of the headboard is directly fastened to the headboard without the leg .

A bracket provided on the upper part for connection between the respective members constituting the frame and for connection between the members in the case of the leg for supporting the frame, and a body provided on the lower part of the bracket for supporting the frame, . Wherein a cover for covering the brackets is covered on corresponding ends of the respective members interconnected on the bracket, one end of the members constituting the frame is assembled through bolts and nuts, and the body is fixed to the lower portion of the bracket with screws do.

However, in the case of a leg of a conventional bed composed of such a large number of parts, there are problems in that work processes for assembling are increased and productivity is lowered.

Therefore, in order to solve this problem, as disclosed in the registered patent publication No. 0594614 filed and registered by the applicant of the present invention, the portion connecting the members constituting the frame and the portion supporting the frame are integrally formed Various embodiments of the provided bed legs are disclosed.

In addition, in the case of the bed leg according to one embodiment of the present invention, the insertion portions are formed such that mutually corresponding end portions of the side plate and the hood plate are inserted in the upper portions on both sides of the upper portion, and a single- There is a leg of. Therefore, in the case of the bed leg provided with a single component as described above, the hood plate and the side plate are inserted into the insertion portion formed on both sides of the upper portion, It is possible to simplify the structure and to improve the assembly and productivity at the same time.

However, according to the present applicant, the bed leg has an advantage of improving the assemblability and speeding up the production, but has a problem that many defective products are generated.

That is, in the case of a bed leg made of a single injection molded article, the inside is hollowed for insertion of the side plate or the hood plate and for reducing the material cost. Accordingly, during the injection molding, The molten resin is injected into the molding space formed between the mold and the core in a state in which the core corresponding to the hollow shape is inserted. Then, the molten resin is dried and separated from the molds, The core is taken out to complete the fabrication. At this time, in the process of removing the core, it is difficult to remove the core from the leg by the adhesion force between the core and the molding to form the leg.

Accordingly, excessive force is exerted on the core at this time, and thus the inside of the leg is formed hollow and the thickness thereof is made thin. In the process of removing the core, the core is excessively scratched and a hole is partially opened, This phenomenon is caused when the core inserted between the molds flows to both sides in the process of injecting the molten resin into the molding space and the specific region of the leg is formed to be thinner than the other regions, .

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a single integrated injection molding apparatus, which is capable of improving assembling efficiency and productivity, And a method of manufacturing the same.

In order to achieve the above object, the present invention is characterized in that, in order to support the space between the frame and the ground while connecting members constituting each side of the frame, a shape bent in the " Wherein the leg is formed by inserting a core into an injection mold and injecting a molten resin into a molding space formed between the injection mold and the core to close the upper portion and open the lower portion, And the hollow portion is formed so as to have a larger width toward the lower portion.

The legs have an upper plate portion which forms an upper surface, an inner plate portion which forms an inner side portion bent into a letter "A ", an outer plate portion which forms an outer side portion bent into a letter " And the end plate portion is tapered so that the distance between the inner plate portion and the outer plate portion increases continuously as the distance between the inner plate portion and the outer plate portion increases.

The legs also include an upper plate portion forming an upper surface, an inner plate portion forming an inner side portion bent into a letter "A ", an outer plate portion forming an outer side portion bent into a letter" Wherein each of the end side plate portions is provided with an insertion hole formed at an upper side of the side plate portion at both ends of the leg so as to be laterally opened for insertion of the respective members, And a stepped portion is provided so as to be inserted inwardly of the ball and the lower side of the insertion hole.

In addition, the present invention provides a single integral type injection molding machine for supporting between the frame and the ground while connecting the members constituting each side of the frame, taking a shape bent in the "? &Quot; shape along the horizontal direction, And a hollow portion formed in the lower portion of the cavity and having a hollow portion formed therein, the hollow portion of the cavity having a hollow portion corresponding to the shape of the hollow portion between the injection mold and the injection mold including a first mold and a second mold, And the molten resin is injected into the molding space formed between the injection mold and the core to eject the core, the first and second molds are separated from each other, And is formed of a molding corresponding to the shape of the molding space.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a leg 10 of a bed according to the present embodiment is a frame that forms a skeleton of a bed, and connects the members 1 and 2 constituting each side of the frame, And has a shape that is bent in an " a " shape along the horizontal direction.

The members 2 and 3 constituting each side of the frame include a headboard (not shown), a hood plate 1 provided on the opposite side of the headboard (not shown), a headboard (not shown) The members 1 and 2 represent the double hood plate 1 and the one side plate 2 in the figure.

The leg 10 includes an upper plate portion 11 forming an upper surface, an inner plate portion 12 forming an inner side portion bent into a letter "A", an outer plate portion 13 forming an outer side portion bent into a " And a pair of end side plate portions (14, 15) forming both end side surfaces.

The leg 10 has a hollow space between the upper plate 11 and the inner plate 12 and between the outer plate 13 and each of the end plates 14 and 15, And insertion holes 10b and 10c are formed at the upper portions of the respective end side plate portions 14 and 15 so as to be laterally opened so as to insert the corresponding mutual end portions of the respective members 1 and 2, And a fastening hole for fastening a member (1,2) inserted into the leg (10) through the insertion hole (10b, 10c) to the leg (10) at an upper side of the inner side plate (10d) is formed.

On the other hand, the legs 10 are provided as a single integral injection molding.

That is, as shown in FIGS. 3 and 4, the legs 10 are injected through the injection molds 20 and 30, and the injection molds 20 and 30 are first engaged with each other and separated from each other A first mold 20 fixed to the outer plate 13 such that the outer shape of the outer plate 13 is engraved and an outer shape of the inner plate 12 and both end plates 14, The first and second molds 20 and 30 are connected to the first and second molds 20 and 30. The first and second molds 20 and 30 are connected to the first and second molds 20 and 30, The flow path 21 is formed.

In the state where the first and second dies 20 and 30 are engaged with each other, a core 40 having a shape corresponding to the shape of the hollow portion 10a from the bottom is formed between the first and second dies 20, The molten resin is injected into the molding space 50a formed between the injection molds 20 and 30 and the core 40 and injected into the molding space 50a The mold 40 is removed and the second mold 30 is moved backward and separated from the first mold 20 after the molten resin is dried in this state, (50) forms the leg (10). Reference numeral 31 denotes a projection protruding from the inner wall of the second mold 30 on the side of the inner plate 12 so as to form the coupling hole 10d. Which guides the advancing and retreating movement of the pin. Further, the core 40 can be inserted between the injection dies 20, 30 through a hydraulic or pneumatic cylinder (not shown) installed at the bottom or removed from the injection dies 20, 30.

5, the core 40 is tapered so that the thickness between the inner surface of the inner plate 12 and the outer surface of the outer surface of the outer plate 13 gradually increases toward the bottom, The hollow portion 10a of the leg 10 formed in a shape corresponding to the core 40 is also continuously enlarged as the distance between the inner side plate portion 12 and the outer side plate portion 13 decreases. This is because it is easy to remove the core 40 from the molding space 50a in a state where the molded article 50 is dried in the molding space 50a and to remove the core 40, .

In detail, in the process of removing the core 40, the core 40 is pulled out of the leg 10 by the adhesion force between the core 40 and the molded product 50 so as to form the leg 10, 6, in the state where the core 40 and the hollow portion 10a are tapered in the same shape as in the present invention, in the process of removing the core 40 downward and removing the core 40, The inner wall of the molded product 50 and the outer surface of the core 40 are not in contact with each other since the upper inner wall and the upper outer wall of the core 40 are separated from each other, It is possible to prevent the inner wall of the molded product 50 from being scratched by the core 40 during the process of removing the core 40 so that a defect rate such as a scratch on the molded product 50 or a hole in the molded product 50 .

The insertion holes 10b and 10c are integrally formed at the time of injection molding of the bed leg 10 according to the present embodiment. For this purpose, the outer surface of the core 40 at each of the end side plate portions 14 and 15 And projections 33 protruding from the outer surfaces of the cores 40 on the side of the insertion holes 10b and 10c are formed in the inner walls of both sides of the second mold 30 toward the insertion holes 10b and 10c .

3 and 4, when the leg 10 is injection-processed through the structure of the injection molds 20 and 30 and the core 40, the projecting portion 33 is projected from the end side plate portion 14 The insertion holes 10b and 10c are integrally formed in the injection process of the leg 10 while the molten resin is not injected into the core 40 while being in close contact with the outer surface of the core 40, It does not affect smooth removal work.

The end side plate portions 14 and 15 of the leg 10 formed integrally with the insertion holes 10b and 10c during the injection molding process are inserted into the insertion holes 10b and 10c at the upper side, (10b, 10c).

The core 40 inserted between the injection dies 20 and 30 in the state where the outer surface of the core 40 on the side of each of the end plate portions 14 and 15 is supported by the projecting portion 33 of the second metal mold 30, Is prevented from flowing to both sides during the injection of the molten resin into the molding space 50a so that the thickness of the outer plate 13, the inner plate 12 and the end plates 14, 15 is uniformly formed as a whole The thickness of the leg 10 is prevented from becoming locally thin, and the defect rate of the leg 10 can be more effectively reduced.

As described above in detail, according to the leg of the bed and the method of manufacturing the same according to the present invention, the legs of the bed according to the present invention can be formed as a single integral- So that the assembling property and the manufacturability are improved, and the defective rate is effectively reduced in the manufacturing process.

Claims (6)

A bridge of a bed which is provided between the respective members by taking a shape bent in a "? &Quot; shape along the horizontal direction to support between the frame and the ground while connecting members constituting each side of the frame, Wherein the leg is formed by injecting a molten resin into a molding space formed between the injection mold and the core by inserting a core into the injection mold and opening a lower portion of the mold, And the width of the hollow portion is set so as to become larger toward the lower portion. The method according to claim 1, The legs have an upper plate portion which forms an upper surface, an inner plate portion which forms an inner side portion bent into a letter "A ", an outer plate portion which forms an outer side portion bent into the letter" A ", and a pair of end portions Wherein the hollow portion is tapered so that the distance between the inner plate portion and the outer plate portion continuously increases as the distance between the inner plate portion and the outer plate portion increases. The method according to claim 1, The legs have an upper plate portion for forming an upper surface, an inner plate portion for forming an inner side portion bent into a letter "A", an outer plate portion for forming an outer side portion bent in a " End side plate portion, An insertion hole is formed in an upper portion of both end side plate portions of the leg to be laterally opened for insertion of the respective members, Wherein each of the end side plate portions is stepped so as to be inserted inwardly from the side of the insertion hole and the side of the insertion hole so that the insertion hole is integrally formed when the leg is injected. Is formed as a single integral molded body so as to support between the frame and the ground while connecting between the members constituting each side of the frame and takes a shape bent in the "? &Quot; shape along the horizontal direction, and the upper portion is closed and the lower portion is opened In manufacturing a leg of a bed having a hollow portion inside, And a core inserted between the injection mold and the injection mold and having a shape corresponding to the shape of the hollow portion so as to increase in thickness toward the lower portion of the injection mold and inserted between the injection mold and the injection mold including the first and second molds, Wherein the molten resin is injected into a molding space formed between an injection mold and a core to eject the core, then the core is taken out, and the first and second molds are separated from each other to form a molded article corresponding to the shape of the molding space A method of manufacturing a leg. 5. The method of claim 4, The legs have an upper plate portion which forms an upper surface, an inner plate portion which forms an inner side portion bent into a letter "A ", an outer plate portion which forms an outer side portion bent into the letter" A ", and a pair of end portions And a side plate portion, Wherein the hollow portion is provided between the upper plate portion, the inner plate portion, the outer plate portion and the respective end side plate portions so as to have a shape corresponding to the shape of the core, Wherein the core is tapered so that the thickness between the outer surface corresponding to the inner plate portion and the outer plate portion continuously increases as the thickness decreases downward. 5. The method of claim 4, The legs have an upper plate portion which forms an upper surface, an inner plate portion which forms an inner side portion bent into a letter "A ", an outer plate portion which forms an outer side portion bent into the letter" A ", and a pair of end portions And a side plate portion, Wherein the hollow portion is provided between the upper plate portion, the inner plate portion, the outer plate portion and the respective end side plate portions so as to have a shape corresponding to the shape of the core, An insertion hole is formed in an upper portion of both end side plate portions of the leg to be laterally opened for insertion of the respective members, The core of the end side plate side plate is formed flat so that the insertion hole is integrally formed when the leg is injected and the core is easily removed. And a protruding portion protruded to abut on the outer surface is provided.

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