Attachment structure of lifting tool

Abstract

To provide a mounting structure of a hoisting accessory in which the hoisting accessory can be fixed to a main body so as to be prevented from carelessly protruding outside, and can freely swing when used.SOLUTION: The structure consists of a main body 11 and a hoisting accessory 21, and a step 12 and a fulcrum shaft 13 are formed at a bottom portion of the main body 11. In the hoisting accessory 21, a cylindrical body 24 is formed protruding in a direction away from the main body 11, the fulcrum shaft 13 is heated and deformed to form a flange 14 covering a tip of the cylindrical body 24 after the fulcrum shaft 13 is fitted into a shaft hole 23 in the cylindrical body, and the hoisting accessory 21 is fixed to the main body 11 by welding the flange 14 and the cylinder body 24 together. Since the cylindrical body 24 is cylindrical and an area of a welded surface with the flange 14 is inevitably limited, the welded portion is easily peeled off by torsional moment when the hoisting accessory 21 is raised and twisted, so that the hoisting accessory 21 can freely swing.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an attachment structure of a hanging tool attached to a packaging container used in a suspended state, such as an infusion container.

Background Art

[0002] Although the shapes of packaging containers for containing liquids are various, those used for infusions in which a small amount of a chemical solution is injected into the body one by one have a hanging tool attached to the bottom thereof. When actually performing an infusion, this hanging tool is hooked on a stand or the like, and the neck of the packaging container is directed downward. An example of the shape of such a packaging container is shown in FIG. 5. The packaging container in this figure has a configuration in which a hanging tool is attached to the bottom of a main body for containing a liquid, and the main body is integrally formed using a thermoplastic synthetic resin as a material. In the figure, a posture with the neck directed downward is depicted, and the flat bottom is located upward. However, when storing or transporting the packaging container, the bottom is directed downward, so that it can be placed stably on a packing box, a table, or the like.

[0003] The bottom of the main body in FIG. 5 is not a simple flat surface, but a step is formed inside the main body, recessed toward the inside from the outer edge of the bottom, and a fulcrum shaft protrudes from the center of this step. The hanging tool is manufactured separately from the main body and has an annular shape in which both ends of a U-shaped strap are connected. Normally, it is housed in the step of the main body, but the strap is raised during use. A shaft hole for fitting the fulcrum shaft is formed at the center of the hanging tool. After fitting the fulcrum shaft into the shaft hole, a flange is formed by pressing while heating the tip surface of the fulcrum shaft, and the hanging tool cannot be detached from the main body by this flange. A hinge is formed near the base of the strap, and only the strap can be raised. In addition, the hanging tool can swing freely around the fulcrum shaft.

[0004] Packaging containers such as those shown in Fig. 5 have been widely popularized so far, and related technological developments have also been carried out since before. Examples of such developments include the patent documents described below. Among them, Patent Document 1 discloses a method for manufacturing a container with a hanging tool used when infusing a patient in a hospital or the like. This container is made of a thermoplastic synthetic resin, and in addition to having a protrusion formed at its bottom, the hanging tool has an opening formed therein. After fitting the protrusion into the opening, the tip of the protrusion is melted and pressed, so that the diameter of that part becomes larger than the opening, and the hanging tool is fixed to the container.

[0005] In the following Patent Document 2, a method for manufacturing a container with a hanging tool that has high fracture strength and can reliably prevent the hanging tool from falling off is disclosed. Regarding this document as well, similar to Patent Document 1 mentioned above, it has a structure for attaching a hanging tool to the bottom surface of the container body. However, on the bottom surface of the container body, a pin-shaped protrusion is formed, and on the hanging tool, a shaft hole for inserting the protrusion is formed. After inserting the protrusion into the shaft hole, the tip of the protrusion is melted without applying pressure, and thereby the protrusion naturally expands, so that the hanging tool can be locked. Regarding the method of melting the protrusion, combustion by a torch or the like is assumed.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] A suspension tool like that shown in Fig. 5 needs to be firmly attached so that it does not accidentally detach from the main body. As a result, the flange and the suspension tool are welded over a wide area, which may restrict the free swinging of the suspension tool. And when the suspension tool is hooked onto a stand or the like in such a welded state, the swinging of the main body is restricted, which may cause problems in the visibility of the label and the routing of the infusion tube to be connected. To prevent such a situation, when the strap is lifted, a strong twist can be applied to the suspension tool to peel off the weld. However, in that case, the pivot shaft or the flange may be damaged, and the suspension tool may detach from the main body.

[0008] Note that by ensuring a slight gap at the boundary between the flange and the suspension tool, it is possible to prevent the suspension tool from being fixed to the main body. However, in that case, since the suspension tool can move freely within a certain range, the tip side of the strap or the like may protrude from the bottom of the main body. And when the main body is filled with liquid, if the suspension tool protrudes from the bottom of the main body, it may get caught on the guide of the conveyor or the like, predicting troubles such as stopping the production line. Therefore, it is desirable to fix the suspension tool to the pivot shaft or the like.

[0009] The technique disclosed in Patent Document 2 mentioned above can attach the suspension tool without looseness and does not cause troubles such as stopping the production line when filling with liquid. Moreover, with this technique, it is possible to avoid the attachment of the suspension tool becoming overly strong, and it is excellent in convenience. However, in Patent Document 2, it is assumed that the protrusion is burned with a torch, and it is difficult to adjust the thermal power, and it is necessary to bring fuel into the production line, which also poses a problem in terms of safety.

[0010] The present invention has been developed based on such circumstances, and aims to provide an attachment structure of a suspension tool that can fix the suspension tool to the main body, prevent it from accidentally protruding externally, and can swing freely during use.

Means for Solving the Problems

[0011] The invention according to claim 1 for solving the above problems comprises a main body for containing various liquids and a hanging tool for hanging the main body. The hanging tool is housed in a step formed at the bottom of the main body, and a fulcrum shaft protrudes from the step. The hanging tool is formed with a cylindrical body protruding in a direction away from the main body, and inside the cylindrical body is the fulcrum shaft is is fitted rare to form a shaft hole, At the tip of the fulcrum shaft, A flange and, projecting from the tip portion to the periphery covers is is formed provided at the tip of the cylindrical body, and the flange and the cylindrical body the tip portion of are welded together. This is the attachment structure of the hanging tool characterized by this.

[0012] The present invention specifies the structure of the location where the hanging tool is attached to the main body in a packaging container composed of the main body and the hanging tool. The main body is a hollow container for containing various liquids, and a neck that serves as an outlet for the liquid is formed at its upper part, and the opposite side of the neck is the bottom. Therefore, when the packaging container is stored or transported, the bottom will be placed on a packing box, a table, etc., but when in use, it is turned upside down, so the hanging tool faces upward and the neck faces downward. In addition, the main body is assumed to be formed of a thermoplastic synthetic resin.

[0013] The hanging tool is a component for hanging the main body, and is attached near the center of the bottom of the main body. Considering inserting a finger or a bar, the inside is in an open annular shape. In addition, the hanging tool is configured to be bendable by forming some kind of hinge. Usually, the whole of the hanging tool lies along the bottom of the main body, but when in use, the part beyond the hinge is raised, and a bar extending from a stand or the like is inserted into it. In addition, a step is formed at the bottom of the main body to accommodate the hanging tool.

[0014] The fulcrum shaft is a rod-shaped part that protrudes from approximately the center of the step at the bottom of the main body and is not hollow. Also, the suspension tool has a shaft hole for fitting the fulcrum shaft. Although the structure of fitting the fulcrum shaft into the shaft hole and forming a flange at the tip of the fulcrum shaft to attach the suspension tool has been widely known conventionally, in the present invention, a cylindrical body is formed on the suspension tool, and it is characterized in that the fulcrum shaft is fitted into it, and inevitably the inside of the cylindrical body becomes the shaft hole. Note that the cross-section of the fulcrum shaft is usually circular in order to realize the swinging of the suspension tool, but it may be other polygons or the like.

[0015] The cylindrical body is a cylindrical part that protrudes from the surface of the suspension tool. It does not protrude from both the front and back surfaces of the suspension tool, but protrudes in a direction away from the main body starting from the connection part with the adjacent part. Therefore, when the fulcrum shaft is fitted into the shaft hole, the tip of the fulcrum shaft protrudes from the cylindrical body. Then, after heating the tip of the fulcrum shaft protruding from the cylindrical body and pressing the fulcrum shaft with a pin or the like, a flange is formed, and the suspension tool is attached to the main body. Also, due to this heating, the flange is welded to the cylindrical body, so the suspension tool is fixed to the main body. Note that in this state, the suspension tool and the fulcrum shaft are assumed to be housed in the step at the bottom of the main body.

[0016] In this way, by heating the fulcrum shaft to form a flange so as to cover the tip of the cylindrical body, the flange and the cylindrical body are welded, and the suspension tool is fixed to the main body. And since the area of the welded surface between the flange and the cylindrical body is approximately equal to the area of the tip surface of the cylindrical body, it will not increase infinitely. Also, this welded surface is suppressed to at most the outer peripheral surface of the cylindrical body. Therefore, prior to actual use, if a part of the suspension tool is lifted up and further twisted, a large torsional moment acts on the welded surface, and the welding is easily peeled off. In addition, by suppressing the area of the welded surface, an excessive torsional moment does not act on the flange or the fulcrum shaft when peeling off the welding, and breakage of the flange or the fulcrum shaft can be prevented.

[0017] The invention according to claim 2 specifies the shape of the cylindrical body, and the cylindrical body is characterized in that it has a tapered shape from its root portion toward the tip portion. If the wall thickness of the cylindrical body is increased, inevitably the welding surface between the flange and the cylindrical body becomes wider, and the effect of the cylindrical body becomes unclear. On the contrary, if the wall thickness of the cylindrical body is suppressed, there is a risk that the molten resin may not flow in sufficiently during its molding. Further, the invention according to claim 3 relates to an outer ring, and the suspension tool has a cylindrical outer ring surrounding the cylinder body outside the cylinder body, and the amount of projection in the direction away from the main body of the outer ring is equal to or greater than the amount of projection in the direction away from the main body of the cylinder body.

[0018] Therefore, as in this invention, by making the cylindrical body tapered, the wall thickness increases at the root portion of the cylindrical body. Thus, when the main body is molded, the molten resin can flow into the root portion of the cylindrical body without difficulty, and the cylindrical body can be finished in an accurate shape. In addition, the area of the tip surface of the cylindrical body is suppressed, and the welding surface with the flange is also suppressed. Moreover, in this invention, since the root portion of the cylindrical body is strengthened, when peeling the welding between the flange and the cylindrical body, the twisting of the cylindrical body is suppressed, and this peeling is induced at an early stage.

Advantages of the Invention

[0019] As in the invention according to claim 1, in the attachment structure of the suspension tool, a fulcrum shaft is formed at the bottom of the main body, and a cylindrical body for fitting the fulcrum shaft is formed on the suspension tool. After fitting the fulcrum shaft into the cylindrical body, the fulcrum shaft is heated to form a flange so as to cover the tip portion of the cylindrical body, whereby the flange and the cylindrical body are welded and the suspension tool is fixed to the main body. Therefore, it is possible to prevent a part of the suspension tool from inadvertently protruding from the bottom of the main body and avoid troubles such as stopping the production line.

[0020] Since the area of the welding surface between the flange and the cylindrical body is almost equal to the area of the tip surface of the cylindrical body, it will not increase infinitely. Also, this welding surface is suppressed up to the outer peripheral surface of the cylindrical body at most. Therefore, prior to actual use, if a part of the lifting tool is lifted and further twisted, a large torsional moment will act on the welding surface, the welding will be easily peeled off, the lifting tool will be able to swing freely, and there will be no problems with the visibility of the label or the routing of the connected infusion tube. In addition, in the present invention, since the area of the welding surface between the flange and the cylindrical body is suppressed, when peeling off the welding, an excessive torsional moment does not act on the flange or the fulcrum shaft, and breakage of the flange or the fulcrum shaft can be prevented.

[0021] In addition, in the present invention, when forming the flange, the fulcrum shaft can be heated using a halogen spot heater or the like. Therefore, electric power can be selected as the energy source, combustion by a torch becomes unnecessary, and it is excellent in terms of safety and working environment. Also, after heating the fulcrum shaft, by pressing the fulcrum shaft with a pin or the like, the pressing amount can be precisely controlled, variation between products is suppressed compared to combustion by a torch, and quality improvement is achieved.

[0022] As in the invention described in claim 2, by making the cylindrical body tapered from its root portion toward the tip portion, when molding the main body, the molten resin can flow into the root portion of the cylindrical body without difficulty, and the cylindrical body is finished in an accurate shape. In addition, the area of the tip surface of the cylindrical body is suppressed, and the area of the welding surface with the flange is also suppressed. In addition, in the present invention, since the root portion of the cylindrical body is strengthened, when peeling off the welding between the flange and the cylindrical body, the twisting of the cylindrical body is suppressed, and this peeling will be induced at an early stage.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0024] FIG. 1 shows a specific example of the attachment structure of the hanging tool 21 according to the present invention, depicting the process of attaching the hanging tool 21 to the main body 11 of the packaging container. Further, on the right side of the figure, a longitudinal section around the shaft hole 23 is depicted. This main body 11 is formed by molding synthetic resin into a hollow shape, generally having a rectangular cross-section, and can accommodate various liquids inside. However, in this figure, the bottom of the main body 11 is facing upward, and only the vicinity of the bottom of the main body 11 is depicted.

[0025] The bottom of the main body 11 is not a simple planar shape. Inside the bottom outer edge, a step 12 that sinks toward the inside of the main body 11 is formed, and the entire hanging tool 21 is accommodated therein. Therefore, the hanging tool 21 does not protrude from the bottom of the main body 11, and the bottom of the main body 11 can be placed stably on a packing box, a table, etc. And at the center of the step 12, a fulcrum shaft 13 that protrudes outward is formed. The fulcrum shaft 13 in this figure has a circular cross-section but is not hollow.

[0026] The lifting tool 21 is used when suspending the main body 11 with a stand or the like. Since both ends of the U-shaped strap 25 are joined by the central strap 28, it is annular and resembles a "D" shape as a whole. When suspending, a finger or a rod is inserted inside it. Also, near the boundary between the central strap 28 and the strap 25, a hinge 22 with locally thinned walls is formed. The strap 25 beyond the hinge 22 can be lifted from the main body 11. However, in order to prevent the strap 25 from accidentally rising, its thickness and other aspects are adjusted so that the hinge 22 does not deform freely at the pre-use stage. In addition, in the middle of the central strap 28, a cylindrical tube 24 is formed to fit the fulcrum shaft 13 of the main body 11. The inside of it is called the shaft hole 23, and the shaft hole 23 penetrates through the tube 24.

[0027] Outside the tube 24, a cylindrical outer ring 26 surrounding the tube 24 is formed. Approximately half of the outer edge of the outer ring 26 is integrated with the central strap 28. Also, the outer ring 26 and the tube 24 are integrated via a connecting plate 27. As depicted in the longitudinal sectional view, the connecting plate 27 is connected to the lower end face on the main body 11 side among the upper and lower end faces of the tube 24, and the tube 24 protrudes in a direction away from the main body 11 starting from the connecting plate 27. However, it does not protrude beyond the outer ring 26.

[0028] As shown in the upper left of FIG. 1, the main body 11 is turned upside down, the lifting tool 21 is placed above the bottom of the main body 11, and then the lifting tool 21 is brought closer to the main body 11. When the fulcrum shaft 13 is fitted into the shaft hole 23, as shown below, the fulcrum shaft 13 protrudes from the tip face of the tube 24. However, at this stage, the lifting tool 21 can be detached from the fulcrum shaft 13. Therefore, as shown on the right side of the figure, after locally heating the tip of the fulcrum shaft 13 with a halogen spot heater or the like, a disk-shaped flange 14 is formed by pressing the fulcrum shaft 13 with a forming pin P. Since the flange 14 has a larger diameter than the shaft hole 23, it prevents the detachment of the lifting tool 21.

[0029] The flange 14 pressed by the forming pin P spreads horizontally into a mushroom shape, covering the tip surface of the cylindrical body 24 and slightly hanging down from the tip surface of the cylindrical body 24 to surround the outer peripheral surface of the cylindrical body 24. At this time, welding occurs due to heating at the contact surface between the flange 14 and the cylindrical body 24, and the suspension tool 21 is fixed to the main body 11. However, if a certain amount of external force is applied to the suspension tool 21, this welding can be peeled off, and the suspension tool 21 can swing freely with respect to the main body 11. Moreover, since the welding surface is inevitably suppressed up to the outer peripheral surface of the cylindrical body 24, it is easy to peel off the welding. In addition, since this peeling occurs at an early stage, the flange 14 and the fulcrum shaft 13 will not be damaged by the shear load. Regarding the flange 14 as well, since it is housed in the step 12 of the main body 11, it does not interfere with the storage of the packaging container or the like.

[0030] Figure 2 shows the state in which the suspension tool 21 is attached to the main body 11 of Figure 1, and here the entire main body 11 is depicted. The main body 11 has a neck portion 16 on the side opposite to the suspension tool 21, and an infusion tube or the like is connected thereto. Further, the suspension tool 21 can raise the pulling strip 25 from the hinge 22 and suspend the main body 11 with a stand or the like. When the pulling strip 25 is raised, if the suspension tool 21 is twisted, the welding between the flange 14 and the cylindrical body 24 is peeled off, and the main body 11 and the suspension tool 21 can swing freely around the fulcrum shaft 13. Usually, since the suspension tool 21 is hooked on a stand or the like, the main body 11 can swing more freely.

[0031] Figure 3 shows an example of the shape of the cylindrical body 24. The cylindrical body 24 can have any configuration around it as long as it is a cylindrical shape protruding in a direction away from the main body 11. As shown in this figure, the cylindrical body 24 can be simply protruded from the planar central band 28. However, when the flange 14 protrudes from the bottom of the main body 11, the main body 11 cannot be placed stably. Therefore, the step 12 at the bottom of the main body 11 is made deep enough to accommodate the flange 14 with a margin.

[0032] Figure 4 shows the process of attaching the suspension tool 21 with a tapered cylindrical body 24 to the main body 11. On the right side of the figure, a longitudinal section around the shaft hole 23 is drawn. Regarding this figure as well, the basic configurations of the main body 11 and the suspension tool 21 are the same as those in Figure 1 and the like, but the difference is that a thick-walled portion 29 is formed at the base of the cylindrical body 24. As described so far, it is necessary to suppress the welding surface with the flange 14 for the cylindrical body 24, and the wall thickness of the cylindrical body 24 will also be suppressed. However, due to this, when forming the suspension tool 21, the molten resin may not be able to flow into the tip surface of the cylindrical body 24, and it may not be finished in an accurate shape.

[0033] Therefore, in this figure, the outer diameter of the base portion of the cylindrical body 24 is increased to form a conical thick-walled portion 29, so that the molten resin can smoothly flow into the tip surface. The thick-walled portion 29 has an appearance like a fillet is formed at the boundary between the connecting plate 27 and the cylindrical body 24, and inevitably the strength of the cylindrical body 24 is improved. Therefore, when the pulling strip 25 of the suspension tool 21 is raised and twisted, the torsion of the cylindrical body 24 is suppressed, and the welding between the flange 14 and the cylindrical body 24 will be peeled off at an early stage.

[0034] The thick-walled portion 29 is limited to the base portion of the cylindrical body 24, and beyond that, the cylindrical body 24 has a simple cylindrical shape with the same diameter. Therefore, even when the outer edge portion of the flange 14 pressed by the forming pin P hangs down from the tip surface of the cylindrical body 24, the contact area between the flange 14 and the cylindrical body 24 does not increase significantly. Note that the tapered shape of the cylindrical body 24 can be freely determined. Therefore, as in this figure, the thick-walled portion 29 can be conical, or it can also be stepped such that a small-diameter cylinder extends from the tip of a large-diameter cylinder.

Explanation of Signs

[0035] 11 Main body 12 Step 13 Fulcrum shaft 14 Flange 16 Head 21 Suspension tool 22 Hinge 23 Shaft hole 24 Cylindrical body 25 Pulling strip 26 Outer ring 27 Connection plate 28 Central strip 29 Thick part P forming pin

Claims

1. It consists of a main body (11) for containing various liquids and a hanging tool (21) for hanging the main body (11). The hanging tool (21) is accommodated in a step (12) formed at the bottom of the main body (11), and a fulcrum shaft (13) protrudes from the step (12). The hanging tool (21) is formed with a cylindrical body (24) protruding in a direction away from the main body (11), and inside the cylindrical body (24) is a shaft hole (23) into which the fulcrum shaft (13) is fitted. At the tip of the fulcrum shaft (13), a flange (14) is formed which covers the tip of the cylindrical body (24) and projects around from the tip. The mounting structure of the hanging tool (21), characterized in that the flange (14) and the tip of the cylindrical body (24) are welded together.

2. The mounting structure of the hanging tool (21) according to Claim 1, characterized in that the cylindrical body (24) is tapered from its root portion towards the tip portion.

3. The hanging tool (21) has a cylindrical outer ring (26) surrounding the cylindrical body (24) outside the cylindrical body (24). The mounting structure of the hanging tool (21) according to Claim 1 or 2, characterized in that the amount by which the outer ring (26) protrudes in a direction away from the main body (11) is equal to or greater than the amount by which the cylindrical body (24) protrudes in a direction away from the main body (11).

Images