JP2006327717A - Paper-made drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper-made drum having improved load resistance strength with a simple structure even if it is made of paper and sufficient joining strength of a drum part and a flange part. <P>SOLUTION: In a drum part 20 having a double pipe structure made of a drum tube 21 and a center tube 22 concentrically arranged in the drum tube 21, a pair of annular members 23 are arranged on both ends of the drum tube 21, an end edge of the drum tube 21 is inserted in a recess part 3 formed on the flange part 30, an outer circumference surface of the drum tube 21 abuts on a side wall surface 34 of the recess part 33 and the drum part 20 and the flange part 30 are joined to make the annular member 23 abut on a bottom surface 35 of the recess part 33. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drum for winding a long product for storage, transportation, and the like, and particularly to a paper drum having sufficient load-bearing strength while being made of paper.

  Conventionally, various drums for winding up, storing and transporting long products represented by electric wires, cables, strings, tapes, and the like have been used. There is known a drum in which a body part and a collar part are formed of different materials, for example, a body part to be wound is made of expanded polystyrene and a collar part attached to both ends of the body part is made of paper.

  However, a drum formed by mixing different kinds of materials has to be sorted for each material at the time of disposal, and has problems such as complicated labor and cost for sorting work. Furthermore, when the trunk and the buttock are integrated with an adhesive, if the trunk and the buttock are formed of different materials, the adhesive is selected in consideration of the adhesiveness between the materials. In addition, since there is a limit to the adhesive strength, many problems in use such as the buttock coming off from the trunk during use have occurred.

  On the other hand, in order to eliminate the need for separation at the time of disposal, there is also known one in which the body portion and the collar portion are both made of paper (for example, see Patent Document 1).

JP 2003-160278 A

  However, in Patent Document 1, a paper notch (saddle part) is formed between an outer paper tube (trunk part) and an inner cap paper tube by sandwiching a cut portion formed in the paper collar (sleeve part) between the outer paper tube ( Although it is said that it is difficult to disengage from the body portion), the cut portion can be formed only in a range corresponding to the inner diameter of the outer paper tube (body portion) because of its structure. For this reason, there was a problem that sufficient adhesive strength could not be obtained unless the area of the cut portion could be secured.

  Moreover, in the structure currently disclosed by patent document 1, since an outer paper pipe | tube (body part) is a mere cylindrical hollow structure, for example, there are many amounts (winding length) which winds up a long product. If it is applied to a large diameter, there is a problem that the load cannot withstand the load and it is distorted. Deformation due to such distortion occurs at the joint between the outer paper tube (body) and the paper collar (hook). Then, there is also a problem that the paper brim (the collar part) is easily detached from the outer paper tube (the trunk part).

  The present invention has been made in view of the above circumstances, and while being made of paper, improves load bearing strength with a simple structure and also has sufficient bonding strength between the trunk and the heel. An object of the present invention is to provide a paper drum that can be used.

  The paper drum according to the present invention that solves the above-described problems is a paper drum in which all of the constituent members are a paper drum, and a cylindrical trunk tube, a cylindrical central tube disposed in the trunk tube, and the barrel At both ends of the tube, a pair of annular members joined to the inner peripheral surface of the trunk tube and the outer peripheral surface of the central tube, and a recess into which an end edge of the trunk tube is inserted into a surface facing the trunk tube And having at least a pair of flanges joined to both ends of the trunk tube, and an outer peripheral surface on an edge side of the trunk tube is in contact with a side wall surface of the recess, and the collar of the annular member The surface facing the portion is in contact with the bottom surface of the recess.

  By adopting such a configuration, it is possible to obtain a drum that is made of paper but has sufficient load-bearing strength. Thus, it is possible to effectively avoid the collar from being removed and to improve the bonding strength.

Moreover, the paper drum which concerns on this invention can be set as the structure by which the thickness of the said annular member is thicker than the depth of the said recessed part formed in the said collar part.
With such a configuration, it is possible to further improve the load bearing strength at the joint portion of the collar portion.

The paper drum according to the present invention has a configuration in which the flange portion is joined to a barrel portion formed by joining and integrating at least the trunk tube, the central tube, and the annular member. Can do.
With such a configuration, the drum can be easily manufactured, and it is easy to deal with multi-product production by simply joining arbitrary collars with the body part as a common part.

  Further, in the paper drum according to the present invention, the flange joining means joins the joining surface of the trunk portion composed of the trunk tube, the central tube, and the annular member, and the collar portion with an adhesive. The projecting piece formed on both end faces of the trunk tube may be inserted into and fitted into the insertion hole formed in the flange portion, thereby comprising the trunk tube, the central tube, and the annular member. You may join a trunk | drum and the said collar part.

  As described above, according to the present invention, it is possible to provide a paper drum having a sufficient load bearing strength. Moreover, while being a simple structure that is easy to assemble, it is possible to effectively prevent the buttock from coming off by suppressing the deformation at the joint portion of the buttock, and to improve its bonding strength. Is also possible.

Hereinafter, a preferred embodiment of a paper drum according to the present invention will be described with reference to the drawings.
Here, FIG. 1 is a perspective view schematically showing an embodiment of a paper drum according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.

In the example shown in FIG. 1, the drum 10 is formed by joining a pair of flange portions 30 to both ends of the body portion 20, and has a shaft hole 40 penetrating in the axial direction at the axial center thereof.
In the present embodiment, each member constituting the drum 10 is made of paper. Therefore, when the drum 10 of the present embodiment is discarded, it can be disposed of by incineration without being time-consuming.

  The paper used for each member constituting the drum 10 is preferably cardboard paper having both strength and lightness, but various paper materials such as paperboard, synthetic paper, water-resistant paper, and recycled paper can be used. Moreover, when utilizing these paper materials, 1 type, or 2 or more types can be laminated | stacked and the intensity | strength can be adjusted suitably.

  In the present embodiment, the drum section 20 of the drum 10 has a trunk tube 21 around which a long product such as an electric wire, a cable, a string, and a tape is wound, and a shaft hole 40 that is coaxially disposed in the trunk tube 21. It has a double tube structure consisting of a central tube 22.

  As shown in the figure, the trunk tube 21 is a cylindrical member that is open at both ends in the axial direction, and is usually formed in a cylindrical shape, but if necessary, the cross section perpendicular to the axial direction is a polygonal shape. You may form in the square cylinder shape which becomes. Further, the center tube 22 forms a shaft hole 40 through which a support shaft included in these devices is inserted when the drum 10 is mounted on a take-up device or a feeding device for a long product. Although it is formed in a cylindrical shape having an inner diameter substantially the same as the shaft diameter of the support shaft of the apparatus, it can be formed in various shapes corresponding to the cross-sectional shape of the support shaft.

As shown in FIG. 2, a pair of annular members 23 are disposed at both ends of the trunk tube 21 so as to be positioned between the trunk tube 21 and the central tube 22.
The annular member 23 has an outer diameter that is substantially the same as the inner diameter of the trunk tube 21, and an inner diameter that is substantially the same as the outer diameter of the center tube 22. The outer peripheral surface of the annular member 23 is joined to the inner peripheral surface on the end edge side of the trunk tube 21, and the inner peripheral surface of the annular member 23 is joined to the outer peripheral surface on the end edge side of the center tube 22.

  In the present embodiment, the trunk portion 20 has a double-pipe structure composed of a trunk tube 21 and a center tube 22, and between the trunk tube 21 and the center tube 22 at both ends of the trunk portion 20. By disposing the annular member 23 and supporting (reinforcing) the inner peripheral surface of the trunk tube 21 by the annular member 23, the load-bearing strength of the trunk portion 20, particularly, the resistance of the trunk portion 20 at the joint portion with the flange portion 30. The load strength can be improved. This makes it possible to provide the drum 10 that is made of paper but has sufficient load-bearing strength.

At this time, the thickness of the annular member 23 can be appropriately adjusted according to the required load bearing strength. However, when the collar part 30 is joined to both ends of the trunk part 20 as described later, the thickness of the annular member 23 is actually increased in the vicinity of the collar part 30. The depth of the concave portion 35 formed in the collar portion 30 so that the annular member 23 supports the inner peripheral surface of the trunk tube 21 even in the portion where the long product is wound around the trunk tube 21 (example shown in FIG. 2). In this case, it is preferable that the thickness be larger than the thickness of the inner surface layer 31 forming the flange 30.
Thereby, while being able to improve the load bearing strength of the trunk | drum 20 in a joining site | part with the collar part 30, the deformation | transformation of the trunk | drum 20 in the said part is suppressed, and the collar part 30 remove | deviates from the trunk | drum 20. Can be effectively avoided.

More specifically, the thickness of the annular member 23 is preferably 5 to 15% of the axial length of the trunk tube 21.
When the thickness of the annular member 23 exceeds the above range and becomes too thick, the weight of the drum 10 becomes heavy and the load applied to the center tube 22 becomes large. Therefore, the drum 10 is used for winding or feeding the drum 10. It may become difficult to use as. On the other hand, if it is less than the above range, the reinforcing effect of the annular member 23 may be insufficient.

  In order to secure a certain thickness or more for the annular member 23, the annular member 23 may be formed by laminating a plurality of paper materials such as the corrugated cardboard described above.

  In addition, although not particularly illustrated, the annular member 23 may be arranged with one or more annular members 23 other than both ends of the trunk tube 21, that is, on the axially central side of the trunk tube 21. Thereby, the further improvement of the load bearing strength of the trunk | drum 20 can be aimed at.

  Here, when the number of the annular members 23 arranged between the trunk tube 21 and the center tube 22 increases, the number of parts of the drum 10 increases, so that the assembly work of the drum 10 becomes complicated and the material cost increases. Possible malfunctions such as a rise. In the present embodiment, the annular member 23 is disposed at both ends of the trunk portion 20, and the annular member 23 supports the inner peripheral surface of the trunk tube 21 even in the vicinity of the flange portion 30. Since sufficient load bearing strength can be ensured with a limited number of parts, whether or not the annular member 23 is disposed at both ends of the trunk tube 21 depends on the demand for further improvement in load bearing strength and the above-mentioned problems. In consideration of the balance, it may be determined appropriately according to the necessity.

On the other hand, the flange portion 30 in the present embodiment communicates with the inner surface layer 31 in which an inner peripheral hole having substantially the same diameter as the outer diameter of the trunk tube 21 is formed, and the shaft hole 40 with substantially the same diameter as the inner diameter of the center tube 22. A laminated structure is formed by laminating an outer layer surface 32 in which an inner circumferential hole is formed, and a concave portion 33 is formed by the inner circumferential hole of the inner surface layer 31 and the outer surface layer 32 at substantially the center of the surface facing the trunk tube 21. Is formed.
The flange portion 30 is joined to the trunk portion 20 by press-fitting / inserting the edge of the trunk portion 20 (trunk tube 21) into the recess 33. At this time, the trunk tube 21 is joined. The outer peripheral surface on the edge side of this is in contact with the side wall surface 34 of the recess 33, and the surface facing the flange 30 of the annular member 23 is in contact with the bottom surface 35 of the recess 33.

  If the trunk portion 20 and the collar portion 30 are joined in this manner, the area of the joining surface between the trunk portion 20 and the collar portion 30 increases, so that the load on the joining portion between the trunk portion 20 and the collar portion 30 is increased. It is possible to effectively avoid the deformation of the joint portion due to the local load by being dispersed.

  Moreover, when joining the trunk | drum 20 and the collar part 30 using an adhesive agent, while ensuring the adhesion area large, an adhesive strength can be improved, and an adhesion nonuniformity becomes difficult to produce. Further, the adhesive strength between the body portion 20 and the flange portion 30 is maintained by shear peeling between the outer peripheral surface of the body tube 21 and the side wall surface 34 of the recess 33 and surface peeling between the annular member 23 and the bottom surface 35 of the recess 33. Therefore, high adhesive strength can be stably obtained.

  In addition, although the collar part 30 can be normally formed in a disk shape, for example, when storing a plurality of drums 10 so that the collar part 30 stands vertically with respect to the placement surface, Considering the ease of stacking, it may be a quadrangular shape such as a square, or another polygonal shape.

The drum 10 according to the present embodiment has the above-described configuration. For example, the body 20 is formed by joining and integrating the body tube 21, the center tube 22, and the annular member 23 in advance. A large number of body parts 20 are prepared, and the collar part 30 having a different size, thickness, etc. is arbitrarily selected according to the type of the long product to be wound, the winding amount (winding length), etc. As shown in FIG. 3, the drum 10 can be manufactured by joining the selected collar portion 30 to the body portion 20.
In this case, it is preferable that the trunk portion 20 is shared, and the flange portion 30 having different sizes and thicknesses is joined, so that it is easy to cope with multi-product production. However, the trunk tube 21 and the central tube 22 are preferable. Alternatively, the drum member 10 may be continuously manufactured by sequentially joining the annular member 23 and the flange portion 30 in a series of continuous steps.

  Moreover, in this embodiment, each member which comprises the drum 10 can be normally joined using an adhesive agent, However, The joining means of each member is not restricted to joining by an adhesive agent, From metal, resin, etc. As long as it is not to use a joining tool other than paper, it may be by uneven fitting such as a combination of a tenon and a mortise, and the joining means by such uneven fitting is a joining means by an adhesive. Can also be used together.

  For example, when joining the collar part 30 to the trunk part 20, on the trunk part 20 side, as shown in FIG. In addition, an insertion hole 36 as shown in FIG. 5 is formed on the flange portion 30 side, and the protruding piece 24 formed in the trunk tube 21 is inserted into the insertion hole 36 formed in the flange portion 30. You may make it join the trunk | drum 20 and the collar part 30 by making it fit.

In order to describe such a joining means more specifically, in the example shown in the figure, four projecting pieces 24 are formed on the end edge of the trunk tube 21 at substantially equal intervals along the circumferential direction. The flange 30 penetrates the outer surface layer 32 along the inner peripheral hole of the inner surface layer 31, that is, along the side wall surface 34 of the recess 33, at a position corresponding to the projecting piece 24 formed on the trunk tube 21. Four insertion holes 36 are formed.
Needless to say, the number of projecting pieces 24 formed on the body tube 21 side and the number of insertion holes 36 formed on the flange portion 30 side is not limited to four, and can be increased or decreased as necessary.

  And after inserting the protrusion 24 in the insertion hole 36 and attaching the collar part 30 to the trunk | drum 20, the collar part 30 is rotated only a predetermined angle, The insertion hole 36 is notched in the notch in the root part of the protrusion 24. A part of the outer surface layer 32 on the one end side is fitted, whereby the body portion 20 and the collar portion 30 can be joined. At this time, as shown in FIG. 6, the width of the insertion hole 36 is formed slightly larger than the thickness of the projecting piece 24, and an annular wedge member 50 having four wedge pieces 51 corresponding to the insertion holes 36. Is used to press the wedge piece 51 of the wedge member 50 into the gap between the insertion hole 36 and the projecting piece 24 (see FIG. 6B), so that the body portion 20 and the flange portion 30 are more firmly connected. It can also be made to join.

  If there is no particular inconvenience in use, the body 20 and the flange 30 may be joined only by press-fitting the edge of the body 20 into the recess 33 formed in the flange 30.

  Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Nor.

  For example, in the embodiment described above, the concave portion 33 formed in the flange portion 30 is formed by laminating the inner surface layer 31 in which the inner peripheral hole is formed on the outer surface layer 32, but is formed with a predetermined thickness. You may form by giving post-processes, such as a cutting process, to the collar part 30. FIG.

  Further, in the above-described embodiment, the end of the trunk portion 20 (trunk tube 21) is press-fitted and inserted into the concave portion 33 previously formed in the flange portion 30, so that the trunk portion 20 and the flange portion 30 are connected. For example, as shown in FIG. 7, a fixed rod 25 is bonded to the end surface of the body portion 20, and has an inner diameter substantially equal to the outer diameter of the fixed rod 25 and fixed. The body portion 20 and the flange portion 30 may be joined by holding the fixing rod 25 between the outer surface layer 32 on which the intermediate layer 37 having a thickness substantially equal to that of the flange 25 and the inner surface layer 31 are sandwiched.

Even when such a joining means is employed, the outer peripheral surface on the edge side of the trunk tube 21 is in contact with the side wall surface 34 of the recess 33 in a state where the trunk portion 20 and the flange portion 30 are joined. In addition, the annular member 23 is still in contact with the bottom surface 35 of the recess 33, and such a configuration is naturally included in the technical scope of the present invention.
In this case, the recess 33 of the flange 30 is formed by the inner peripheral hole of the inner surface layer 31 and the fixed flange 25. In the example shown in FIG. 7, the intermediate layer 37 is laminated on the outer surface layer 32 side. However, a similar intermediate layer 37 may be laminated on the inner surface layer 31 side.

  The paper drum in the present invention has sufficient load-bearing strength while being made of paper, and can be widely used as a drum for winding up, storing and transporting long products.

It is a perspective view showing the outline of one embodiment of the paper drum concerning the present invention. It is AA sectional drawing of FIG. It is a disassembled perspective view which shows an example which joins a collar part to a trunk | drum. It is explanatory drawing which shows a trunk | drum side in an example of the joining means of a trunk | drum and a collar part. It is explanatory drawing which shows the collar part side in an example of the joining means of a trunk | drum and a collar part. It is explanatory drawing which shows an example of the joining means of a trunk | drum and a collar part. It is explanatory drawing which shows the other example of the joining means of a trunk | drum and a collar part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Drum 20 trunk | drum 21 trunk | drum 22 center pipe | tube 23 annular member 24 projecting piece 30 collar part 31 inner surface layer 32 outer surface layer 33 recessed part 34 side wall surface 35 bottom surface 36 insertion hole

Claims (5)

All of the components are paper drums,
A tubular barrel,
A cylindrical central tube disposed in the trunk tube;
At both ends of the trunk tube, a pair of annular members joined to the inner circumferential surface of the trunk tube and the outer circumferential surface of the central tube;
It has a recess into which an end edge of the trunk tube is inserted into a surface facing the trunk tube, and includes at least a pair of flanges joined to both ends of the trunk tube,
While the outer peripheral surface on the edge side of the trunk is in contact with the side wall surface of the recess,
A paper drum, wherein a surface of the annular member facing the flange is in contact with a bottom surface of the recess.   The paper drum according to claim 1, wherein a thickness of the annular member is thicker than a depth of the concave portion formed in the collar portion.   The paper product according to any one of claims 1 to 2, wherein the flange portion is joined to a trunk portion formed by joining and integrating at least the trunk tube, the central tube, and the annular member. drum.   The paper drum according to any one of claims 1 to 3, wherein a joining surface of the trunk portion including the trunk tube, the central tube, and the annular member, and the flange portion is joined by an adhesive.   By inserting and fitting projecting pieces formed on both end surfaces of the trunk tube into insertion holes formed in the collar portion, the trunk portion including the trunk tube, the central tube, and the annular member, and the collar The paper drum of any one of Claims 1-3 formed by joining a part.

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