JPH0872162A - Hollow reinforced plate made of synthetic resin and reinforcing material used therein - Google Patents

Abstract

PURPOSE: To provide a hollow reinforced plate made of a synthetic resin high in load bending strength, easy in the altering planning of said strength and not requiring the repreparation of a mold. CONSTITUTION: In a hollow reinforced plate 1 made of a synthetic resin, a reinforcing material 2 having a vertical cross section of a shape wherein upper and lower almost parallel wires running in a lateral direction are connected by a linear or non-linear connection wire in a mode leaving the opening part of one of the parallel wires as a vertical cross section in a length direction is inserted in the hollow part 3a of a hollow plate 3 made of a synthetic resin in a mode positioning the opening part in either one of left and right lateral directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing plate used for furniture, particularly a hollow reinforcing plate made of a synthetic resin used for a shelf board, and a synthetic resin which is easy to change its design in addition to improving the flexural strength under load. The present invention relates to a hollow reinforcing plate and a reinforcing material used therefor.

[0002]

2. Description of the Related Art In recent years, polyvinyl chloride, polypropylene, polyethylene and other synthetic materials have been developed in view of the improvement of coloring technology of synthetic resins and the processing technology for imparting a feeling of natural material, cost reduction and convenience of handling due to weight reduction. BACKGROUND ART Resin hollow reinforcing plates are widely used for shelf boards and top plates of various furniture. On the other hand, as shown in the perspective views of FIGS. 17 and 18, the conventional synthetic resin hollow reinforcing plate has a steel pipe-shaped rectangular or circular pipe-shaped cross section in the hollow portion of the synthetic resin hollow plate. The one in which the reinforcing material is inserted is used.

However, since these square or circular pipe type reinforcing members require many steps at the time of molding, they are relatively expensive in terms of cost. Recently, as shown in a perspective view of FIG. A U-shaped reinforcing member having a U-shape is inserted into a synthetic resin hollow plate with the U-shaped opening located on the lower side or the upper side.

Since the U-shaped reinforcing member has an open cross-section, it is advantageous in terms of cost due to a small number of steps during molding, and has a flexural strength under load which is slightly inferior to that of the rectangular pipe-shaped reinforcing member, but is circular. It has the advantage that it is almost comparable to the pipe-type reinforcement. However, on the other hand, in the above-described usage of the U-shaped reinforcing material, since the U-shaped opening exists on the lower side or the upper side, the lower surface or the upper surface of the synthetic resin hollow plate as shown in FIG. Of the U-shaped openings, portions located on both side ends of the U-shaped opening are pressed to form convex portions 5 that are partially bulged in a convex shape, which not only impairs the appearance but also causes whitening in the portions, which is made of synthetic resin. There is a drawback that the plate is often damaged. Note that FIG. 20 shows U of the vertical cross section of the synthetic resin hollow reinforcing plate in FIG.
It is drawing corresponding to the partial enlarged view of the part in which the character-shaped reinforcing material was inserted.

Further, in order to increase the flexural strength under load by keeping the thickness of the synthetic resin hollow plate constant, the number of reinforcing materials used must be increased or the wall thickness of the reinforcing material must be increased. In the latter case, it is necessary to re-initiate the die.

On the other hand, with the recent diversification of lifestyles, the furniture and its usage are also diversified. For example, the flexural strength under load, such as a shelf or a top plate of a large furniture for a system kitchen, a counter, or a living room, is particularly high. In many cases, it is necessary to develop a technique for further improving the flexural strength under load.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the conventional situation as described above, and has a practically superior load deflection strength as compared with the conventional one, and a conventional U-shaped reinforcing material can be used. There is no damage to the synthetic resin hollow plate as seen, and it is also easy to change the design of the flexural strength under load according to the application.In addition, when changing the flexural strength under load, the mold for the reinforcement can be restarted. It is an object of the present invention to provide a synthetic resin hollow reinforcing plate that does not require work and is advantageous in terms of cost, and a reinforcing material used therefor.

[0008]

DISCLOSURE OF THE INVENTION The present invention is directed to a vertical or vertical cross section with respect to the lengthwise direction. The upper and lower substantially parallel lines running in the lateral direction are linear or non-linear in a mode in which one opening of the parallel lines remains. A reinforcing material having a vertical cross section of a shape connected by a parallel connecting line is inserted in the hollow portion of the synthetic resin hollow plate in a mode in which the opening is located in either the left or right lateral direction. Is a hollow reinforcing plate made of synthetic resin. The upper and lower substantially parallel lines that run in the lateral direction, that is, the two upper and lower lines that run in the lateral direction and are arranged in a substantially parallel positional relationship are generally straight lines, but for example, wavy lines or ribbed shapes Even if there is a curved portion in part, it is sufficient if the central part is almost straight as a whole, and since these are inserted into the upper and lower inner surfaces of the hollow part of the synthetic resin hollow plate in a joined state, a substantially parallel positional relationship Should be placed in.

As a typical typical embodiment of the reinforcing material, a vertical cross section with respect to the lengthwise direction has a U-shape, a shape in which the English letter M is overturned, and upper and lower substantially parallel lines running in the horizontal direction are parallel to each other. A reinforcing material having a cross section in which a linear shape or a non-linear connecting line including at least one wavy (including a broken line) curved portion is connected in a mode in which one opening of the line is left is included. Further, in practice, in a cross section perpendicular to the length direction of the reinforcing material, the length dimension of each of the upper and lower substantially parallel lines traveling in the lateral direction is 5 mm or more, and the length of the upper and lower substantially parallel lines traveling in the lateral direction is generally greater than or equal to 5 mm. A preferred embodiment is one in which the sum of the length dimensions is 1.5 times or more the height dimension of the reinforcing material, that is, the distance between the upper and lower substantially parallel lines.

[0010]

As a result of the experiment, the synthetic resin hollow reinforcing plate of the present invention is not limited to the conventional U-shaped reinforcing member having a deflection strength under load,
The flexural strength under load is larger than that using the circular pipe type reinforcing material and comparable to that using the square pipe type reinforcing material.

In addition, in a cross section perpendicular to the length direction of the reinforcing member, the sum of the lengths of the upper and lower substantially parallel lines running in the lateral direction is 1.5 times or more the interval length between the substantially parallel lines. By so doing, it is possible to obtain practically sufficient load deflection strength in a mode in which the plate thickness of the synthetic resin hollow reinforcing plate is kept relatively small. Furthermore, in the synthetic resin hollow reinforcing plate of the present invention, the opening of the cross section perpendicular to the longitudinal direction of the reinforcing member is located in either the left or right lateral direction, and is not located in the vertical direction. Both end portions partially press the upper surface or the lower surface of the synthetic resin hollow plate to partially bulge the synthetic resin hollow plate as seen in the case of the conventional U-shaped reinforcing material, resulting in a convex portion. There is no phenomenon such as whitening or damage.

This phenomenon is prevented especially when the length of each of the upper and lower substantially parallel lines running in the lateral direction is 5 mm or more, and more preferably 7 mm or more in a cross section perpendicular to the length direction of the reinforcing material. It is valid.

In addition, when designing to change the flexural strength under load, the dimension of the synthetic resin hollow plate in the thickness direction, that is, the dimension of the reinforcing material in the height direction is changed in the shape of the cross section perpendicular to the longitudinal direction of the reinforcing material. Without changing the size of the lateral width of the reinforcing member, it is possible to easily change and design the magnitude of the bending strength under load to a desired strength. Further, at this time, it is not necessary to change the thickness of the reinforcing material, and the lateral width of the reinforcing material can be molded without changing the mold as described later, so that there is no need to re-initiate the mold. . Therefore, it is also advantageous in terms of cost due to the fact that the design of changing the deflection strength under load is easy and the reworking of the mold is unnecessary.

[0014]

The present invention will be described in more detail below. FIG.
Is a synthetic resin hollow reinforcing plate 1 according to a typical embodiment of the present invention.
2 shows a vertical cross section with respect to the length direction of the. In this embodiment,
The reinforcing member 2 having a U-shaped vertical cross section with respect to the length direction, in which the U-shaped opening is located in either the left or right lateral direction, the hollow portion of the synthetic resin hollow plate 3 3a
Has been interpolated.

2 and 3 show another embodiment of the present invention and are drawings corresponding to FIG. As shown in these drawings, generally, the synthetic resin hollow plate 3 is adopted in various forms in consideration of required strength, design, cost and the like.

FIGS. 4 and 5 are views showing an embodiment of the present invention in which a reinforcing member 2 having a shape in which an English letter M is laid over in a vertical cross section with respect to the lengthwise direction is used. Furthermore, FIG.
9 to 9 show a mode in which the reinforcing material 2 is fixed by using the claw portion 3b for fixing the reinforcing material. As described above, the reinforcing member 2 may be inserted into the hollow portion 3a of the synthetic resin hollow plate 3, and the fixing means thereof does not matter.

In general, the concrete shape of the synthetic resin hollow plate of the present invention is not particularly limited, and the reinforcing member is placed in the hollow portion of the synthetic resin hollow plate in a state where its opening is located in either the left or right lateral direction. It only needs to have a shape that can be interpolated. Normally, the synthetic resin hollow reinforcing plate of the present invention is mainly intended for shelf boards and top boards, and in particular shelf boards,
The plane shape is a rectangle with long sides, and a vertical cross section with respect to the length direction is provided with a hollow portion having a quadrangular shape in the length direction of the synthetic resin hollow plate, and a claw portion for fixing a reinforcing material is provided in the hollow portion.
Alternatively, a mode in which it is inserted without being attached is preferably adopted. The hollow part may be an open type instead of a closed type. For example, a claw part for fixing a reinforcing material is provided on the lower surface of a flat synthetic resin hollow plate, and the reinforcing material is fixed using the claw part. You may. In the present specification, the term "hollow part" is used to include the fixing space for the reinforcing material using the claws of this aspect.

When designing to change the flexural strength under load, the dimension in the thickness direction of the synthetic resin hollow plate, that is, the dimension in the height direction of the reinforcing material is determined in the shape of the cross section perpendicular to the longitudinal direction of the reinforcing material. Although it may be changed, in general, changing the height of the reinforcing material will change the height of the hollow part of the synthetic resin hollow plate, which requires re-working of the mold of the synthetic resin hollow plate. However, this is a cost disadvantage. Therefore, it is desired to perform a design for changing the deflection strength under load without changing the height of the hollow portion of the synthetic resin hollow plate, but this can be easily achieved in the present invention.

That is, in the present invention, when the design of changing the flexural strength under load is performed, as shown in FIGS. 6 to 9, the height dimension H of the reinforcing member 2 is not changed, so that the synthetic resin hollow plate 3 is used. By changing the width dimension W of the reinforcing member 2 without changing the height of the hollow portion 3a, it is possible to easily change the design of the deflection strength under load. FIG. 7 is a diagram in which only the width dimension of the U-shaped reinforcing material in FIG. 6 is lengthened.
Is the length of only the width dimension of the reinforcing material in which the letter M in FIG.

For example, in the case of a U-shaped reinforcing material as a typical example, the material plate has a thickness of 1.0 mm and a height of 10 mm.
By increasing the width of the reinforcing material having a width of 10 mm by 1.5 times or 2 times, the flexural strength under load of the reinforcing material itself is about 1.
It is improved 45 times and 1.9 times. Further, also in the reinforcing material in which the letter M is rolled over, the same flexural strength under load as that of the U-shaped reinforcing material can be obtained by changing only the width dimension.

Further, in the present invention, since the opening of the cross section perpendicular to the lengthwise direction of the reinforcing member is located in either the left or right lateral direction and not in the vertical direction, both end portions of the opening are By partially pressing the upper or lower surface of the synthetic resin hollow plate, the synthetic resin hollow plate, which is seen in the case of the conventional U-shaped reinforcing material, is partially swollen and a convex portion is generated, which causes whitening. Although it is unlikely that such damage will occur, the more effective prevention of such a phenomenon is to measure the length of each of the upper and lower substantially parallel lines running in the lateral direction in the cross section perpendicular to the length direction of the reinforcing material. That is, the width of the reinforcing material is 5 mm or more, and further 7 m
It is preferably m or more.

Generally, the thickness of shelf boards and top boards of various furniture is practically limited due to the effective use of space, design, cost, etc., and the thickness is kept below a predetermined upper limit. It is necessary to secure the required flexural strength under load. On the other hand, the deflection strength under load of the reinforcing material in the present invention is
In the cross section perpendicular to the length direction of the reinforcing material, there is a property that the deflection strength under load increases as the sum of the lengths of the upper and lower substantially parallel lines running in the lateral direction increases.

Therefore, as a result of comprehensively examining them,
In order to practically sufficiently satisfy the load flexural strength required for shelf boards and top boards of various furniture, the reinforcing material in the present invention has a vertical cross section with respect to the longitudinal direction of the reinforcing material, and a vertical traveling top and bottom. It is particularly recommended that the sum of the lengths of the substantially parallel lines is 1.5 times or more the height of the reinforcing material.

Further, the present invention is also characterized in that when the design for changing the flexural strength under load is performed, it is not necessary to re-initiate the mold of the reinforcing material. Generally, in the molding of the reinforcing material in the present invention, as shown in the principle diagram of FIG. 10, a female mold 6 and a male mold 7 are used to first mold the reinforcing material as shown in FIG. A material plate 8 having a constant width is set in the opening of the female die 6 and then pressed by the male die 7 to obtain a reinforcing material. Therefore, when only the width W is changed without changing the height H of the reinforcing material when the opening is located in either the left or right lateral direction, it is not necessary to separately rework the mold and the same metal mold is used. A reinforcement having a desired width W can be easily obtained by changing only the width of the material plate 8 for forming the reinforcement using a mold. As described above, the deflection strength under load can be changed by adjusting the width W of the reinforcing material.

In the conventional U-shaped reinforcing member, when the thickness of the synthetic resin hollow plate is constant, it is necessary to change the lateral width of the U-shaped reinforcing member. For this purpose, the mold is restarted. Requires work.

Further, FIGS. 11 to 16 show other various aspects of the reinforcing material used in the present invention in a cross section perpendicular to the longitudinal direction of the reinforcing material. All of these differ in the form of a connecting line that connects the upper and lower substantially parallel lines. That is,
In FIG. 11, the connecting line is formed by bending the central portion of the connecting line in a mountain shape in the direction opposite to the opening, and in FIG. 12, the connecting line is formed in a bow shape in the direction of the opening. In FIG. 13, the connecting line is curved in an arcuate direction in the direction opposite to the opening, in FIG. 14, small half arcs are formed at the upper and lower ends of the connecting line, and in FIG. 15, the connecting line is wavy. 16, it is configured in a wavy line shape. In this way, the connecting line is a non-linear connecting line that is wholly or partially curved or bent, and is superior in flexural strength under load to that of a linear connecting line. .

The material of the reinforcing material in the present invention is steel, iron, aluminum or other various metals, as well as synthetic resin,
Ceramic or the like is appropriately used. As the synthetic resin of the synthetic resin hollow plate, polyvinyl chloride, polypropylene, polyethylene and other thermoplastic resins are generally used.

Example 1 A synthetic resin hollow reinforcing plate having a cross section shown in FIG. 1 was manufactured. The synthetic resin hollow plate is made of polyvinyl chloride, and has a plate thickness of 20 mm as a hollow plate, an upper plate thickness of 0.91 mm, a lower plate thickness of 0.9 mm, and four vertical rib thicknesses constituting the hollow plate. 0.7 mm, maximum thickness of crescent-shaped parts at both ends 1.
0 mm. Further, the reinforcing material has a height dimension H17.
5 mm, width W20 mm, thickness d of reinforcing material plate
It is made of 0.8 mm steel. The synthetic resin hollow reinforcing plate has a width of 280 mm and a length of 864 mm in a plan view. The magnitude of the load when the both ends of the synthetic resin hollow reinforcing plate in the lengthwise direction were supported and the load was evenly applied from the upper side and displaced 5 mm downward was determined. The result is 62.5Kg
It was a heavy load value.

Example 2 Example 2 was carried out under the same conditions as in Example 1 except that the reinforcing member having a U-shaped cross section in Example 1 was replaced with a reinforcing member having a cross section of an M-shape shown in FIG. did. Reinforcement is height,
The width and the thickness of the material plate are the same as those in the first embodiment. The load value of 5 mm displacement was 65 kg weight.

Comparative Example 1 An example other than using a square pipe type reinforcing member, a circular pipe type reinforcing member or a U-shaped reinforcing member shown in FIGS. 17 to 19 instead of the reinforcing member in Example 1. It carried out on the same conditions as 1. The thickness of the reinforcing material is all the same as the thickness of the material plate of the reinforcing material in Example 1, the square side of the square pipe type reinforcing material is 17.5 mm, and the circular outer diameter of the circular pipe type reinforcing material. Is 17.5 mm, the height of the U-shaped reinforcement is 17.5 m
m, width 20 mm. As a result, the load value of 5 mm displacement was 62.5 kg weight and 37.5 K when using a square pipe type, a circular pipe type or a U-shaped reinforcing material, respectively.
g-weight and 35.0 Kg-weight.

Example 3 In FIG. 6, the height dimension H of the reinforcing material was kept constant, and the width dimension W was varied. The position of the claw portion for fixing the reinforcing material was changed in accordance with the change in the width dimension of the reinforcing material. As the synthetic resin hollow plate, the same synthetic resin hollow plate as in Example 1 was used except that a nail for fixing the reinforcing material was additionally provided. As the reinforcing material, the same reinforcing material as in Example 1 was used, and the width dimension was changed to 0.5 times, 1.0 times, and 1.5 times. As a result, the ratio of the load value of 5 mm displacement of the synthetic resin hollow reinforcing plate using the reinforcing material whose width is changed to 0.5 times, 1.0 times, and 1.5 times is as follows:
It was 0.53: 1: 1.4.

[0032]

As described above, the synthetic resin hollow reinforcing plate of the present invention has various excellent effects as described below. 1. In general, the flexural strength under load is larger than that of conventional U-shaped or circular pipe-shaped reinforcements, and even when compared with square-shaped pipe-shaped reinforcements, practically sufficient load deflection strength is obtained. . 2. The surface of the synthetic resin hollow plate, which is seen in the conventional U-shaped reinforcing material, partially swells, and the damage phenomenon causing whitening is not observed. 3. The design of changing the deflection strength under load can be easily performed by changing the width dimension without changing the height dimension of the reinforcing material. Therefore, without changing the thickness of the hollow synthetic resin,
By using a reinforcing material having an appropriate width according to the desired flexural strength under load as the reinforcing material, a synthetic resin hollow reinforcing plate having arbitrary flexural strength under load can be easily obtained. 4. Even when changing the width of the reinforcing material when changing the design of the deflection strength under load, it is not necessary to re-initiate the mold for the reinforcing material, and simply use a material plate with a width according to the purpose as the material plate of the reinforcing material. Just use it. In this respect, the conventional square pipe type, circular pipe type, and U-shaped reinforcing materials have a great advantage over the need to re-initiate the die. It should be noted that increasing the number of reinforcing materials used in order to increase the flexural strength under load generally results in higher cost. 5. It is advantageous in cost economy as compared with the conventional one. That is, the conventional square pipe type or circular pipe type reinforcing material has a non-open sectional shape and requires multiple steps for manufacturing, resulting in high cost, but the reinforcing material in the present invention has an open sectional shape. Therefore, it can be manufactured in a single process, which is advantageous in terms of cost. Further, as described above, in the design of changing the deflection strength under load, the above-mentioned conventional reinforcing materials including the U-shaped reinforcing material required re-raising of the mold, but this is not necessary in the reinforcing material of the present invention. Also in terms of cost economy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view perpendicular to the length direction of a synthetic resin hollow reinforcing plate according to a representative embodiment of the present invention.

FIG. 2 is a view showing another embodiment of the present invention.

FIG. 3 is a view showing another embodiment of the present invention.

FIG. 4 is a view showing another embodiment of the present invention.

FIG. 5 is a view showing another embodiment of the present invention.

FIG. 6 is a view showing another embodiment of the present invention.

FIG. 7 is a view showing another embodiment of the present invention.

FIG. 8 is a view showing another embodiment of the present invention.

FIG. 9 is a view showing another embodiment of the present invention.

FIG. 10 is a principle view showing a method for molding a reinforcing material used in the present invention.

FIG. 11 is a cross-sectional view perpendicular to the longitudinal direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 12 is a cross-sectional view perpendicular to the longitudinal direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 13 is a cross-sectional view perpendicular to the length direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 14 is a cross-sectional view perpendicular to the length direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 15 is a cross-sectional view perpendicular to the longitudinal direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 16 is a cross-sectional view perpendicular to the length direction showing another embodiment of the reinforcing material used in the present invention.

FIG. 17 is a perspective view showing an embodiment of a conventional synthetic resin hollow reinforcing plate.

FIG. 18 is a perspective view showing an embodiment of a conventional synthetic resin hollow reinforcing plate.

FIG. 19 is a perspective view showing an embodiment of a conventional synthetic resin hollow reinforcing plate.

FIG. 20 is a partially enlarged view of a synthetic resin hollow reinforcing plate using a conventional U-shaped reinforcing member.

[Explanation of symbols]

1 Synthetic Resin Hollow Reinforcement Plate 2 Reinforcing Material in the Present Invention 3 Synthetic Resin Hollow Plate 3a Hollow Part of Synthetic Resin Hollow Plate 4 Conventional Reinforcing Material 5 Partially Swelled Convex Part on Surface of Synthetic Resin Hollow Plate 6 Female mold 7 Male mold 8 Material plate for molding reinforcing material

Claims (7)

[Claims] 1. A vertical cross section with respect to a length direction, wherein upper and lower substantially parallel lines running in a lateral direction are connected by a linear or non-linear connecting line in a state where one opening of the parallel line is left. A hollow made of synthetic resin, wherein a reinforcing material having a vertical cross section of a shape is inserted in a hollow portion of a hollow plate made of synthetic resin in a mode in which the opening is located in either the lateral direction. Reinforcement plate. 2. The synthetic resin hollow reinforcing plate according to claim 1, wherein a reinforcing material having a U-shaped cross section perpendicular to the length direction is used. 3. A vertical cross section with respect to the longitudinal direction has an English letter M.
The synthetic resin hollow reinforcing plate according to claim 1, wherein a reinforcing material having an overturned shape is used. 4. A reinforcing material is used in which the connecting line connecting the upper and lower substantially parallel lines traveling in the lateral direction is a non-linear connecting line including at least one wavy curved line portion. The synthetic resin hollow reinforcing plate according to 1. 5. The synthetic resin hollow reinforcing plate according to claim 1, wherein a reinforcing material is used in which the length of each of the upper and lower substantially parallel lines running in the lateral direction is 5 mm or more. 6. A reinforcing material is used in which the sum of the length dimensions of the upper and lower substantially parallel lines traveling in the lateral direction is 1.5 times or more the height dimension of the reinforcing material. The synthetic resin hollow reinforcing plate according to 1. 7. A vertical cross section with respect to the longitudinal direction is a cross section in which upper and lower substantially parallel lines traveling in the lateral direction are connected by a non-linear connecting line with one opening of the parallel line left. A reinforcing material for a hollow reinforcing plate made of synthetic resin, which has.