JP2001072062A - Steel pallet and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel pallet simple in structure and possible to produce consistently and a method for producing the same. SOLUTION: A steel pallet is constituted of a top panel 1 provided with a large number of beads 3, the supports 2 continued to the top panel and the connection pieces 4 continued to the supports to be fixed to the rear surface of the top panel 1. This steel pallet is produced by a rigidity increasing process for applying the beads 3, an edge finishing process for hemming, a first bending process for bending the connection pieces 4 and the inner surfaces 23 and bottom surfaces of the supports 2 at an almost right angle, a second bending process for almost forming the supports 2 and an attaching process for integrating the connection pieces and the rear surface of the top plate 1 by a fixing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pallet formed by bending a single thin metal plate and a method of manufacturing the same.

[0002]

2. Description of the Related Art Generally, when a steel pallet is to be formed by bending a single metal sheet, a bead is first applied in the longitudinal direction of the sheet by pressing, and the four sides are always hemmed. Then, the support and the connecting piece are bent at a substantially right angle by a press. Then, the connecting piece may be fixed to the back surface of the top plate, but when forming the pillar by the press, particularly when a bead is attached to a thin plate material, the bead is crushed when the pillar is finished in a square shape, and the mold is broken. At present, it cannot be manufactured because it cannot be removed from the mold because it is in close contact with the mold. For this reason, the conventional steel pallet, in which the top plate and the support are separately manufactured, is assembled and completed by fixing means such as spot welding and riveting. This is based on the inventor's application for patent application Hei 7-
No. 30509, Japanese Utility Model Application No. 5-16969, Japanese Utility Model Application No. 5-5
No. 4728 and Japanese Utility Model Application No. 4-66402.

[0003]

However, in the case where the above-mentioned top plate and support columns are separately manufactured and assembled into a complete product by fixing means such as spot welding or riveting, it is very difficult to arrange and manage each part. In addition, there is a problem that it is difficult to reduce the cost due to the odd number of steps and a large number of steps when removing the material for each part.

[0004] It is an object of the present invention to provide a steel pallet having an extremely simple structure formed by bending a single sheet material and capable of being manufactured consistently, and a method of manufacturing the same. .

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, that is, a metal thin plate having a large number of beads on its surface; The steel pallet is composed of a support that is formed by connecting and bending the support and a connecting piece that is connected to the support and fixed to the back surface of the top plate. The beads may be applied continuously or discontinuously. It is good to provide a claw insertion port on the support and use it for a four-way insertion port, attach a support member for the midfoot to the center back surface of the top plate, or attach one or many top plate members at the lower part of the support It may be mounted and used on both sides.

[0006] The method of manufacturing includes at least the following steps. B) Rigidity increasing process for attaching beads in the longitudinal direction of a thin metal plate. B) An edge finishing process for hemming a thin plate. C) a first bending step of bending the inner surface and the bottom surface of the connecting piece and the support pillar at substantially right angles with a bending mold, respectively; D) A second bending step in which the support and the end of the top plate are bent by a final bending mold to substantially form the support. E) A mounting step of integrating the connecting piece with the back surface of the top plate by a fixing means. At this time, (a) before performing the rigidity increasing step, providing a hole for forming an insertion hole for a claw in the column, or performing a concave part forming step in which a concave is provided on the back surface of the bead to facilitate bending. Good, and e) in the mounting process, the connecting piece abuts on the entire back surface of the top plate and is fixed,
A method of manufacturing a heavy steel pallet in which the connecting pieces are overlapped and fixed on the back surface of the top plate, or the connecting pieces are sandwiched and fixed between the top plate and the plate.

[0007]

1 to 4 are views showing an embodiment of a steel pallet according to the present invention, and a description will be given based on this. (1) is a top plate made of a thin metal plate with a number of beads (3) attached in the longitudinal direction of the surface. As the material, a zinc iron plate, an aluminum plate, an aluminum alloy plate, a stainless steel plate, or the like may be used. Its thickness is 0.3mm ~ 2.3
It is sufficient to use a diameter of mm and select it according to the application. (2)
Is a column formed by connecting and bending the top plate (1). The column (2) has an outer surface (21), a bottom surface (22), and an inner surface (2).
3). (4) is a connecting piece connected to the inner surface (23) of the column (2) and fixed to the back surface of the top plate (1). Particularly in the case of a heavy steel pallet, FIG.
A longer connecting piece (4) is provided so as to abut the entire rear surface of the top plate (1) as shown in FIG. 5 (a), or the same size as the rear surface of the top plate (1) as shown in FIG. A contact plate (41) is prepared and the connecting piece (4) is sandwiched and fixed between the back surface of the top plate (1) and the contact plate (41), or a long connecting piece (4) as shown in FIG. It is advisable to superimpose them on the back of the top plate (1) and fix them. The bead (3) is attached continuously over the top plate (1), the support (2), and the connecting piece (4). The connecting piece (4) may be formed by spot welding or the like at all points where the bead (3) attached to the connecting piece (4) is in contact with the bead (3) attached to the top plate (1) or at regular intervals. The fixing means (6) is applied and fixed (see FIGS. 3 and 4).
As the fixing means (6), in addition to spot welding, one of riveting, caulking, general welding, screwing, or a combination thereof may be used. (7) is a recess provided in the bead (3) for easy bending when forming the top plate (1) and the support (2), and the recess (7) has a size of the R chamfer. They are provided together (see FIG. 13). As shown in FIGS. 12 (a), 12 (b) and 14 (b), the recess (7) is provided at the bending position.

FIG. 6 is a view showing a steel pallet according to another embodiment of the present invention.
All bends have R chamfers, and connection pieces (4)
Is folded inside the support (2) and fixed to the back surface of the top plate (1). A support member (9) for the midfoot is attached to the center rear surface of the top plate (1), and the support members (2) on both sides and a lower portion of the support member (9) are substantially the same as the top plate (1). A top plate member (10) of a metal thin plate material having a plurality of substantially the same length and a bead (3) is attached thereto (see FIGS. 7 and 8). The support member (9) for the middle foot is a bead (3)
Each side of the attached metal sheet is bent at a right angle, and the piece fixed to the center rear surface of the top plate (1) is bent outward as shown in FIG. 9 (a). It may be bent inward like. Alternatively, the bent portion of the support (2) may not be rounded, and may be formed substantially at a right angle as shown in FIG. 9B.
When the support member (9) is mounted, when the support plate (41) is mounted as shown in FIG. 9B, it is mounted thereon.

FIG. 10 is a view in which the steel pallet of the present invention is used for a four-way insertion port.
A four-way insertion member (11) having a claw insertion port (5) is attached, and the others are the same. FIG. 11 is a view showing a steel pallet according to another embodiment, in which the bead (3) is discontinuous, and the bead (3) is easily attached without bead (3) near each bending position. [Fig.
(C) and (d)]. Further, the support (2) is provided with a claw insertion port (5) for use in a four-way insertion port. Note that the bead (3) is not limited to the longitudinal direction of the thin plate material, and may be attached, for example, obliquely.

FIG. 14 is a view showing a method of manufacturing a steel pallet according to the present invention, and the description will be made based on this. A 0.5 mm thick zinc iron plate having a predetermined size is prepared in advance as a thin metal plate. First, bead (3) in the longitudinal direction
A) A rigidity increasing step is performed [FIG.
(A)]. At this time, the beads (3) may be attached continuously as shown in FIG. 12 (a) or discontinuously as shown in FIGS. 12 (c) and (d). Instead of the bead (3), the thin plate itself may be processed into a rectangular pulse or waveform that alternately repeats peaks and valleys as shown in FIG. 12B. Note that the dashed line in FIG. 12 indicates each bending position, and the lead line of each dashed line indicates the name after assembly. Further, as shown in FIG. 12 (d), a hole (8) may be provided on the side surface of the column (2) for a claw of a lift to enter, so that it can be used for a four-way insertion port.

Next, the sheet material on which the bead (3) is attached is turned upside down so that the bead (3) is turned up, and the bend (3) is half-pressed at each bending position such as both end positions of the top plate (1). Circular or V
A concave portion forming step of providing a concave portion (7) such as a character is performed [see FIG. 14 (b)]. The recess (7) is provided at each bending position. Note that the concave portion forming step is not necessarily performed. Thereafter, an edge finishing step of hemming the long side of the thin plate material is performed (see FIG. 14C). At this time, the short side is not hemmed, but may be performed according to the shape and use. Then, the connecting piece (4) and the inner surface (23) and the bottom surface (22) of the column (2) are bent substantially at a right angle and simultaneously or sequentially with a bending die (c) A first bending step is performed [FIG. (D)].
The connecting piece (4) may be bent in the direction opposite to the direction shown in the figure so as to be folded inside the support (2). Also, FIG.
The dashed line in FIG. 4 indicates the bending position. Next, the outer surface (21) of the column (2) and the end of the top plate (1) are bent using a mold for final bending to substantially form the column (2). D) A second bending step is performed. See FIG. 14 (e)]. Supports (2) from above
As shown by the arrow in the figure, and the connecting piece (4) is
A strut correction process for approaching the back surface is performed [see FIG. 14 (f)]. An e) mounting step is performed in which the connecting piece (4) is integrated with the top plate (1) by fixing means (6) such as spot welding (see FIG. 14 (g)). It is also possible to adopt a method in which the positioning means is placed in a mold and the fixing means (6) such as spot welding is performed after the positioning in the mold without performing the pillar correction step. By performing the above steps, a steel pallet is completed from one sheet material. When manufacturing a heavy steel pallet, the connecting piece (4) fixed to the back of the top plate (1)
It is preferable to use a reinforcing means such as increasing the length in advance and superimposing them substantially, or using a plate having a thickness of 0.8 mm.

[0012]

The present invention having the above-described structure has the following effects.

According to the first aspect of the present invention, the metal sheet top plate (1) having a large number of beads (3) on its surface can ensure strength and rigidity even with a thin sheet material. By integrally forming the support (2) integrally with the top plate (1) and fixing it via the connecting piece (4), the structure becomes extremely simple, manufacturing becomes easy, and waste material is discharged. Since it can be used effectively without the need, the cost can be reduced, and the number of locations where the fixing means (6) is applied is reduced as compared with the conventional product, and it can be formed from one sheet material, so that the weight can be reduced.

Since a large number of beads (3) are attached to the top plate (1), the support (2), and the connecting piece (4) in the longitudinal direction, the structure is simple and the manufacturing is easy. Can be performed easily and consistently, and a more robust and lighter steel pallet can be obtained.

According to a third aspect of the present invention, instead of the bead (3), the sheet material itself is bent into a rectangular pulse or a waveform in which peaks and valleys are alternately repeated, thereby processing the material in advance at the time of the material. Can be used. If a large material is prepared, the material can be selected or cut in accordance with the size of the steel pallet, and the rigidity increasing step can be omitted on the production line.

According to a fourth aspect of the present invention, the same effect as in the first and second aspects can be obtained by folding the connecting piece (4) into the inside of the support (2) and fixing it to the back surface of the top plate (1). As a result, the bead (3) is polymerized in close contact, so that a more robust steel pallet can be obtained.

According to the fifth aspect, the connecting piece (4) abuts on the entire back surface of the top plate (1) and is fixed, or the connecting pieces (4) are overlapped on the back surface of the top plate (1). By fixing, when compared with the case where the connecting piece (4) is simply fixed to the top plate (1), for example, when compared with the one made of 0.5 mm thick zinc iron plate, the mounting weight is 1 ton. Was reduced to nearly 2 tons and could be used for weight.

According to a sixth aspect of the present invention, the connecting piece (4) is connected to the top plate (1) and the contact plate (4) having substantially the same size as the back surface of the top plate (1).
Claim 5 by sandwiching and fixing by 1).
The same effect as above can be obtained, and the appearance when the steel pallet is turned upside down is good.

According to a seventh aspect of the present invention, the support member (9) for the middle foot is attached to the center rear surface of the top plate (1), so that the luggage can be more stably placed on the top plate (1) of the steel pallet. And increase the strength of the steel pallets.

According to an eighth aspect of the present invention, a bead (3), which is substantially the same size as the top plate (1), is provided below the columns (2) on both sides.
By attaching the metal sheet top member (10) with the attached steel plate, the steel pallet can be used on both sides and the strength can be increased. Also, a top plate member (10) of a metal thin plate material having substantially the same length as the top plate (1) and having a bead (3).
By mounting a plurality of pallets, a steel pallet that can easily be used on both sides can be obtained, and the strength can be increased.

A steel pallet for a four-way outlet can be easily obtained by simply attaching a four-way outlet member (9) having a nail inlet (5) to the lower portion of the column (2). Can be obtained.

According to the tenth aspect of the present invention, by providing the claw insertion port (5) in the support (2), the post (5) can be used as a steel pallet for a four-way insertion port.

[0023] A bead (3) is attached to a thin metal sheet as described in claim 11, a) a rigidity increasing step, a hemming of a long side of the thin sheet material, b) an edge finishing step, a connecting piece (4) and a support. (2) The inner surface (23) and the bottom surface (22) of (2) are bent at substantially right angles, respectively. C) The first bending step and bending the ends of the support (2) and the top plate (1) with the final mold. (2) The support (2) is substantially formed
A thin sheet material can be manufactured by a manufacturing method including at least a second bending step and an e) attaching step of integrating the connecting piece (4) with the back surface of the top plate (1) and the fixing means (6). Since it has a very simple structure formed by bending, it can be manufactured consistently. As a result, the productivity can be improved by about 30% as compared with the conventional one, and the cost can be reduced.

According to the twelfth aspect of the present invention, a) after the rigidity increasing step, the thin plate on which the bead (3) is attached is turned upside down so that the bead (3) is raised, and the position of both ends of the top plate (1) is determined. By performing a recess forming step in which a bead (3) is provided with a depression (7) such as a semicircle or a V-shape at each bending position by a press, bending at each bending position is easily performed, The corners are beautifully finished.

According to a thirteenth aspect, after the second bending step, in order to bring the connecting piece (4) closer to the back surface of the top plate (1), the bottom surface (22) of the column (2) is raised from above. By performing the pressed column correction process, fixing means (6) such as spot welding can be easily performed, and an accurate finish can be obtained.

According to a fourteenth aspect, on both sides of the thin plate material,
By providing holes (8) for the claw insertion holes (5) to be formed in the support (2) before performing the rigidity increasing process, it is possible to easily obtain a steel pallet for a four-way insertion hole. Becomes

In the rigidity increasing step, instead of the bead (3), the thin sheet material is bent into a rectangular pulse shape or a waveform in which peaks and valleys are alternately repeated. By using a material, it is possible to use a material that has been processed in advance at the time of the material, and if a large material is prepared, it can be easily selected and cut according to the size of the steel pallet (1) The rigidity increasing step can be omitted on the production line, and the efficiency can be further improved.

According to a sixteenth aspect of the present invention, in the rigidity increasing step, the beads (3) are connected to both ends of the top plate (1) and the columns (2).
Outer surface (21), bottom surface (22), inner surface (23) and connecting piece (4)
Is not provided at a position bent at a substantially right angle, but is discontinuously provided, and the concave portion forming step is omitted, so that the bent portion has
It becomes angular without chamfering, and the mounting width of the top plate (1) can be effectively used up to the end.

(E) In the mounting step (e),
Either the connecting piece (4) abuts on the entire back surface of the top plate (1) and is fixed, the connecting pieces (4) are overlapped and fixed on the back surface of the top plate (1), or the connecting piece (4) is fixed. By being sandwiched and fixed between the top plate (1) and the plate (41), a heavy steel pallet can be manufactured. E) In the mounting process, the connecting piece (4) abuts on the entire back surface of the top plate (1) and is fixed and manufactured, so that a heavy steel pallet can be manufactured and the back surface is finely finished. It will be.

(E) In the mounting step, if spot welding is used as the fixing means (6) for fixing the connecting piece (4) to the top plate (1), efficient and consistent production is achieved. If a rivet or a screw is used, the mounting process can be easily performed anywhere regardless of where the work is performed. Further, an e) mounting step can be performed by caulking or general welding, and when the mounting step is performed in combination with the fixing means (6) according to a place or equipment, quality such as strength improvement is improved. It is also possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a product of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a cross-sectional view showing a state where a connecting piece used in the present embodiment is attached.

FIG. 6 is a perspective view showing a product of the present invention.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a cross-sectional view showing a state where a number of top plate members used in another embodiment are attached.

FIG. 9 is an explanatory diagram illustrating a use state of a support, a support member, and a top plate member of the present embodiment.

FIG. 10 is an explanatory view showing a state where a four-way insertion member is attached to the product of the present invention.

FIG. 11 is a perspective view showing another embodiment of the product of the present invention.

FIG. 12 is an explanatory view showing a developed state of a thin plate material used in the present invention.

FIG. 13 is an explanatory diagram showing a dent of the present embodiment.

FIG. 14 is an explanatory view showing an embodiment of the manufacturing method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top plate 2 Prop 21 Outer surface 22 Bottom 23 Inner surface 3 Bead 4 Connecting piece 41 Applicable plate 5 Insert port 6 Fixing means 7 Depression 8 Hole 9 Prop member 10 Top plate member 11 Four-way insertion member

Claims (18)

[Claims] 1. A top plate (1) made of a thin metal sheet having a number of beads (3) on its surface, and a column (2) formed to be continuous with the top plate (1) and bent. And a connecting piece (4) connected to the support (2) and fixed to the back surface of the top plate (1). 2. A top plate (1) made of a thin metal sheet provided with a number of beads (3) in the longitudinal direction, a bead (3) continuous with the top plate (1), and the top plate. A support (2) connected to both ends of (1) and bent and a connecting piece (4) connected to the support (2) and fixed to the back surface of the top plate (1). A steel pallet at least constituted. 3. A rectangular pulse or waveform in which the sheet material itself alternates between peaks and valleys instead of beads (3) attached to the top plate (1), the support (2) and the connecting piece (4). The steel pallet according to claim 2, wherein the steel pallet is bent. 4. The steel pallet according to claim 1, wherein the connecting piece is folded inside the column and fixed to the back surface of the top plate. 5. The connecting piece (4) is fixed by abutting on the entire back surface of the top plate (1) or the connecting pieces (4) are overlapped on the back surface of the top plate (1). 3. The steel pallet according to claim 1, which is fixed. 6. The connecting piece (4) is sandwiched and fixed between the top plate (1) and a contact plate (41) having substantially the same size as the back surface of the top plate (1). Or the steel pallet according to 2. 7. The steel pallet according to claim 1, wherein a support member (9) for a middle foot is attached to a central rear surface of the top plate (1). 8. A metal sheet material having substantially the same width or a plurality of substantially the same length as the top plate (1) and a bead (3) is provided under the columns (2) on both sides. 3. A steel pallet according to claim 1, further comprising a plate member. 9. The steel pallet according to claim 1, wherein a member for a four-way insertion port (11) having a claw insertion port (5) is attached to a lower portion of the column (2). 10. The steel pallet according to claim 1, wherein said support post is provided with a claw insertion port. 11. A step of increasing the rigidity of applying a bead (3) by a press in the longitudinal direction of a thin metal plate material. B) An edge finishing step of hemming the long side of the thin plate material. C) A first bending step in which the connecting piece (4) and the inner surface (23) and the bottom surface (22) of the support (2) are bent at substantially right angles by a bending die. D) A second bending step in which the ends of the support (2) and the top plate (1) are bent by a final bending mold to substantially form the support (2). E) an attaching step of integrating the connecting piece (4) with the back surface of the top plate (1) by a fixing means (6). A method for producing a steel pallet, comprising at least the above steps. 12. A) After the rigidity increasing step, the sheet material on which the bead (3) is attached is turned upside down so that the bead (3) is turned up, and each folding of the top plate (1) at both end positions and the like is performed. The method for manufacturing a steel pallet according to claim 11, wherein a concave portion forming step of forming a semicircular or V-shaped concave portion (7) in the bead (3) by a press at a bending position is performed. 13. D) After the second bending step, in order to bring the connecting piece (4) closer to the back surface of the top plate (1), a column straightener for pressing the bottom surface (22) of the column (2) from above. The method for manufacturing a steel pallet according to claim 11, wherein the step is performed. 14. A hole (8) for forming a claw insertion port (5) in the support (2) before performing the rigidity increasing step on both sides of the thin plate material. Item 12. The method for producing a steel pallet according to Item 11. 15. The method according to claim 11, wherein in the step of increasing the rigidity, the thin plate material is bent in a rectangular pulse shape or a waveform in which peaks and valleys are alternately repeated instead of the beads (3). Manufacturing method of steel pallets. 16. A) In the rigidity increasing step, the beads (3) are connected to both ends of the top plate (1) and the outer surfaces (21) of the columns (2),
2. The device according to claim 1, wherein the bottom surface, the inner surface, and the connecting piece are not provided at positions substantially bent at right angles, but are provided discontinuously.
2. The method for producing a steel pallet according to claim 1. 17. E) In the mounting step, the connecting piece (4) is fixed by abutting on the entire back surface of the top plate (1), or the connecting pieces (4) are connected to each other by the back surface of the top plate (1). Fixed on top of each other,
12. The method for manufacturing a steel pallet according to claim 11, wherein the connecting piece (4) is sandwiched and fixed between the top plate (1) and the contact plate (41). E) In the mounting step, fixing means (6) for fixing the connecting piece (4) to the top plate (1) includes spot welding, riveting, caulking, general welding, and screwing. The method for producing a steel pallet according to claim 11, which is used alone or in combination.