Cable drum

Abstract

To provide a cable drum capable of improving productivity and simplifying component management by suppressing a total number of components, and capable of improving durability at use.SOLUTION: A cable drum 1 is equipped with a body portion 10 around which a cable H is wound, and a pair of collar portions 20 and 20 provided at both end portions 10a and 10a of the body portion 10. The body portion 10 is composed of a plurality of crosspiece plates 11, and each crosspiece plate 11 can be folded through hinge portions 12 and 14 at a connecting part of a center portion in an axial direction X and the collar portion 20. In an inner space 10b of the body portion 10, there are provided a cylindrical reinforcing member 30 located so as to hold the inside of the hinge portion 12 at the center portion in the axial direction X of each crosspiece plate 11, and a rod-shaped member 40 that is journaled by the hinge portion 12 at the center portion in the axial direction X of each of three crosspiece plate 11 on a base end 40a side, is inserted into a through-hole 31 formed on the reinforcing member 30, and slides in the through-hole 31 of the reinforcing member 30 with the folding of each crosspiece plate 11.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to a cable drum. [Background technology]

[0002] Traditionally, cable drums made of wood or synthetic resin have been used to wind and transport long, heavy cables such as power cables. In recent years, foldable drums that reduce transportation costs and enable repeated use have been put into practical use. One such cable drum is described in Patent Document 1. The foldable cable winding drum described in Patent Document 1 includes a pair of circular flanges with shaft holes on both sides and a straight body portion made of multiple crosspiece members whose center and both end portions are folded between the pair of circular flanges via hinge mechanisms. When using the drum, the multiple crosspiece members are linearly extended from their folded state, and the extended state of the multiple crosspiece members is locked via a locking member to form a substantially cylindrical body portion, and the power cable or the like is wound around the straight body portion for transportation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-104740 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional folding cable winding drum requires many parts, such as parts for locking the tensioned state of the multiple crosspiece members and parts for reinforcing them, which increases the number of manufacturing steps, resulting in poor productivity, and also increases the number of parts management steps, resulting in high costs.Furthermore, the hinge mechanism has many moving parts, resulting in poor durability.

[0005] The present invention has been made in view of the problems inherent in the prior art, and an object of the present invention is to provide a cable drum that can reduce the total number of parts, improve productivity, simplify parts management, and improve durability during use. [Means for solving the problem]

[0006] A cable drum according to one aspect of the present invention comprises a trunk portion around which a cable is wound, and a pair of flanges provided at both ends of the trunk portion, the trunk portion being composed of a plurality of cross plates, each of which is foldable via hinge portions at its axial center and at its connection with the flange, and the inner space of the trunk portion is provided with a tubular reinforcing member positioned to hold the inside of the hinge portion at the axial center of each of the cross plates, and a rod-shaped member whose base end is pivotally supported by the hinge portions at the axial centers of at least two of the cross plates, and whose end is inserted from the base end to the tip end into a through hole formed in the reinforcing member, so that it slides through the through hole of the reinforcing member as the cross plates are folded. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a cable drum that can reduce the overall number of parts, thereby improving productivity and simplifying parts management, and that can improve durability during use. [Brief explanation of the drawings]

[0008] [Figure 1A] 1 is a perspective view showing an example of a cable drum according to an embodiment of the present invention. FIG. [Figure 1B] FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A. [Figure 1C] FIG. 1B is a cross-sectional view taken along line CC in FIG. 1A. [Figure 2A] FIG. 2 is a perspective view of a right crosspiece used in the cable drum. [Figure 2B] FIG. 10 is a perspective view of the right-side crosspiece seen from the back side. [Figure 2C]FIG. 2 is a perspective view of the left crosspiece used in the cable drum, seen from the back side. [Figure 3A] 10 is a cross-sectional view showing the main parts of the connection portions of the cross plates with the guide bar and flange portion. FIG. [Figure 3B] FIG. 3B is a perspective view of part B in FIG. 3A. [Figure 4] FIG. 2 is a perspective view of a reinforcing member used in the cable drum. [Figure 5A] FIG. 2 is a perspective view of a guide bar used in the cable drum. [Figure 5B] FIG. 10 is a perspective view of another embodiment of the guide bar. [Figure 5C] FIG. 10 is a perspective view of another embodiment of the guide bar. [Figure 6A] FIG. 2 is a perspective view of the cable drum when folded. [Figure 6B] FIG. 6B is a cross-sectional view taken along line BB in FIG. 6A. [Figure 6C] FIG. 6B is a cross-sectional view taken along line CC in FIG. 6A. [Figure 7A] FIG. 2 is a perspective view of the cable drum when not in use. [Figure 7B] FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A. [Figure 7C] FIG. 7B is a cross-sectional view taken along line CC in FIG. 7A. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a cable drum according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0010] FIG. 1A is a perspective view showing an example of a cable drum according to an embodiment of the present invention. FIG. 1B is a cross-sectional view taken along line BB in FIG. 1A. FIG. 1C is a cross-sectional view taken along line CC in FIG. 1A. FIG. 2A is a perspective view of a right-side cross plate used in the cable drum. FIG. 2B is a perspective view of the right-side cross plate seen from the back. FIG. 2C is a perspective view of the left-side cross plate used in the cable drum seen from the back. FIG. 3A is a cross-sectional view showing the main parts of the connection portions of each cross plate with the guide bar and flange. FIG. 3B is a perspective view of part B in FIG. 3A. FIG. 4 is a perspective view of a reinforcing member used in the cable drum. FIG. 5A is a perspective view of a guide bar used in the cable drum. FIG. 5B is a perspective view of another embodiment of the guide bar. FIG. 5C is a perspective view of another embodiment of the guide bar. FIG. 6A is a perspective view of the cable drum when folded. FIG. 6B is a cross-sectional view taken along line BB in FIG. 6A. FIG. 6C is a cross-sectional view taken along line CC in FIG. 6A. FIG. 7A is a perspective view of the cable drum when unused. FIG. 7B is a cross-sectional view taken along line BB in FIG. 7A. FIG. 7C is a cross-sectional view taken along line CC in FIG. 7A.

[0011] As shown in Figures 1A to 1C, the cable drum 1 includes a trunk portion 10 around which the cable H is wound, a pair of flange portions 20, 20 provided at both ends 10a, 10a of the trunk portion 10, and a reinforcing member 30 disposed within the inner space 10b of the trunk portion 10 to reinforce the trunk portion 10.

[0012] As shown in Figures 1A and 6B, the body 10 is configured in an approximately cylindrical shape with multiple slats 11 that form an inner space 10b, and each slat 11 is made of wood and can be freely folded via hinge portions 12 and 14 at the center in the axial direction X and at the connection portion with the flange portion 20.

[0013] As shown in FIG. 1A, each crosspiece 11 is divided into two parts, a right crosspiece 11R and a left crosspiece 11L, and the adjacent ends (joints) of these crosspieces 11R and 11L are foldable via a hinge 12. Furthermore, both outer ends (connections with the flange 20) of each crosspiece 11R and 11L are attached to the flange 20 via a hinge 14. These hinges 12 and 14 enable the empty drum to be folded. As shown in FIGS. 1A and 7A, when the right crosspiece 11R and the left crosspiece 11L are extended linearly from their folded state, the body 10 assumes a substantially cylindrical shape. As shown in FIG. 1B, a long and heavy power cable, such as a cable H, can be wound around the substantially cylindrical body 10.

[0014] 1B, the inner space 10b of the body 10 contains a cylindrical (ring-shaped) reinforcing member 30 arranged to hold the inside of the hinge portion 12 located at the center of each crosspiece 11 in the axial direction X, and a guide bar (rod-shaped member) 40 that holds the reinforcing member 30. That is, as shown in FIGS. 1B and 1C, the cylindrical reinforcing member 30 is attached so as to be located within the inner space 10b of the body 10 by the guide bar 40 that is pivotally supported by pins on the hinge portions 12 of each of the three crosspieces 11 arranged 180 degrees apart.

[0015] As shown in FIGS. 2A to 2C, a long groove 11a extending in the axial direction X and accommodating the guide bar 40 is formed in the center of the back surface of each of the crosspieces 11R, 11L, which is the inner diameter side of the drum. As shown in FIGS. 2A to 2B, the end of the left crosspiece 11L on the joint side of the right crosspiece 11R forms a protrusion 11c having a pivot hole 11b. As shown in FIG. 2C, the end of the right crosspiece 11R on the joint side of the left crosspiece 11L forms a recess 11d having a pivot hole 11b. As shown in FIGS. 2A and 2C, oblique notches 11e are formed on both outer sides of the protrusion 11c of the right crosspiece 11R and on the inner side of the recess 11d of the left crosspiece 11L at locations that come into contact when folding an unused sheet. 3A and 3B, the protrusion 11c of the right crosspiece 11R is inserted into the recess 11d of the left crosspiece 11L, and the base end 40a of the guide bar 40 is accommodated in the long groove 11a of the right crosspiece 11R. Thereafter, by inserting the pin 13 into each of the pivot holes 11b and 41, the right crosspiece 11R, the left crosspiece 11L, and the guide bar 40 are pivotally supported via the pin 13 so as to be freely rotatable. In other words, the pivot holes 11b and 41 and the pin 13 form the hinge portion 12.

[0016] As shown in FIGS. 1A and 1B, the flange 20 is made of wood and has a circular disk shape with a small-diameter shaft hole (through-hole) 21 in the center. A shaft rod of a cable drum support device (not shown) is inserted into this shaft hole 21, allowing the cable H to be wound around and unwound. In other words, the shaft hole 21 functions as a bearing. Furthermore, both ends 10a, 10a of the body 10 are attached to the inner surface of the flange 20 via hinges 14. That is, as shown in FIG. 5A, the hinge 14 has a pair of mounting plates 14b, 14b pivoted by a pin 14a. One mounting plate 14b of the pair of mounting plates 14b, 14b is fixed to the end of each right crosspiece 11R and each left crosspiece 11L that constitute the body 10 by screws or the like, and the other mounting plate 14b is fixed to the inner surface of the flange 20 by screws or the like.

[0017] 1B, 1C, and 2, the reinforcing member 30 is made of metal or hard resin and is cylindrical (ring-shaped), and has three equally spaced rectangular through-holes 31 through which the guide bars 40 are inserted. The cylindrical reinforcing member 30 is attached to each of the three crosspieces 11 arranged 120 degrees apart via the guide bars 40 so as to hold the inside of the hinge portion 12 located at the center of each crosspiece 11 in the axial direction X within the inner space 10b of the body 10.

[0018] 1C, 3A, and 3B, guide bar 40, which pivotally supports reinforcing member 30 via pin 13, is made of metal or hard resin and is formed in a rectangular prism shape. Its base end 40a is provided with a pivot hole 41 for inserting pin 13. Furthermore, a tip 40b of guide bar 40 is provided with a rectangular plate-like flange portion 42 that prevents reinforcing member 30 from slipping out of through hole 31. As shown in FIG. 3A, the base end 40a of guide bar 40 is pivotally supported by pin 13 at the center of each of three crosspieces 11 in the axial direction X, and the guide bar 40 is inserted from the base end 40a to the tip 40b through through hole 31 of reinforcing member 30. Guide bar 40 inserted through through hole 31 slides in through hole 31 of reinforcing member 30 as each crosspiece 11 is folded.

[0019] As shown in Fig. 5A, guide bar 40 is formed in the shape of a rectangular prism, but as shown in Fig. 5B, it may be composed of a rectangular rod-shaped small diameter member 40A and a square tubular large diameter member 40B that expands and contracts small diameter member 40A. Also, as shown in Fig. 5C, a compression coil spring (elastic member) 43 may be interposed inside square tubular large diameter member 40B, and the biasing force of the spring may be used to expand small diameter member 40A.

[0020] According to the cable drum 1 of the above embodiment, as shown in Figures 7A to 7C, when the cable drum 1 is not in use, the multiple crosspieces 11 are folded from the center, thereby saving space during transportation and storage. In this folded state of the multiple crosspieces 11, as shown in Figures 7B and 7C, the guide bar 40 moves in the pulling-out direction, so that the reinforcing member 30 is always fixed at the joint between the right crosspiece 11R and the left crosspiece 11L of the multiple crosspieces 11.

[0021] Furthermore, when using the cable drum 1, as shown in Fig. 1B, the body 10 can be easily assembled without tools by simply moving the right-side crosspiece 11R and the left-side crosspiece 11L from their folded state to a linearly extended state, thereby forming a substantially cylindrical shape. In this assembled state, as shown in Fig. 1C, the guide bar 40 is pressed into the center of the reinforcing member 30, so that the right-side crosspiece 11R and the left-side crosspiece 11L are held in an unfoldable shape by the outer periphery of the reinforcing member 30, and the reinforcing member 30 reinforces each crosspiece 11 integrally. This reinforcing member 30 allows repeated assembly and folding with fewer hinge portions 12 and hinges 14 than conventional devices, thereby improving the durability of the cable drum 1.

[0022] In this way, the cable drum 1 can be assembled and folded easily and reliably without using tools, thereby saving space during transportation and storage. Furthermore, the total number of parts can be reduced, further improving productivity and simplifying parts management. Furthermore, by reducing the number of moving parts, such as the hinges 12 and 14, located at the folding points of the multiple crosspieces 11, the durability of the cable drum 1 can be improved.

[0023] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment.

[0024] That is, in the above embodiment, the body and crosspieces of the cable drum are made of wood, but they may also be made of synthetic resin or metal.

[0025] Furthermore, in the above embodiment, the center of the crosspiece and the base end of the guide bar are pivotally supported by a pin, but the center of the crosspiece and the end of the guide bar may be supported by a hinge.

[0026] Furthermore, in the above embodiment, a cylindrical reinforcing member is used, but a polygonal cylindrical reinforcing member may also be used.

[0027] Furthermore, in the above embodiment, a rectangular prism-shaped guide bar is used, but a cylindrical guide bar may also be used.

[0028] Furthermore, in the above embodiment, the cylindrical reinforcing member is held by three guide bars, but the reinforcing member may be held by two or four or more guide bars. [Explanation of symbols]

[0029] 1 cable drum 10. Torso 10a, 10a both ends 10b Inner space 11 Multiple planks 11a long groove 11e Diagonal cutout 12 Hinge part 13-pin 14 Hinge (hinge part) 20,20 Pair of flanges 30 Reinforcement member 31 Through hole 40 Guide bar (rod-shaped member) 40a proximal end 40b tip 40A small diameter member 40B Large diameter member 41 Pivot hole 42 Flange 43 Compression coil spring (elastic member) H Cable X-axis direction

Claims

1. a trunk portion around which the cable is wound; A pair of flanges provided at both ends of the body; Equipped with The body portion is composed of a plurality of cross plates, and each cross plate is foldable via a hinge portion at a central portion in the axial direction and at a connection portion with the flange portion, The cable drum has, in the inner space of the body, a cylindrical reinforcing member positioned so as to hold the inside of the hinge portion located at the axial center of each of the cross plates, and a rod-shaped member whose base end side is pivotally supported on the hinge portion located at the axial center of at least two of the cross plates, and whose tip side is inserted through a through hole formed in the reinforcing member so that it slides through the through hole of the reinforcing member as the cross plates are folded.

2. The cable drum according to claim 1 , wherein the at least two cross plates have long grooves formed therein that extend in the axial direction and that receive the rod-shaped members.

3. 3. The cable drum according to claim 2, wherein a base end side of the rod-shaped member is housed in each of the long grooves located at the axial center of the at least two cross plates and pivotally supported via a pin.

4. a pivot hole into which the pin is inserted is provided at the base end of the rod-shaped member; The cable drum according to claim 3 , wherein a flange portion is provided at a tip of the rod-shaped member to prevent the reinforcing member from slipping out of the through hole.

5. The cable drum according to any one of claims 1 to 4, wherein an oblique notch is formed in the axial center of each of the cross plates at a location that comes into contact when the cross plates are folded.

6. The cable drum according to claim 1 , wherein the rod-shaped member has a small diameter member and a large diameter member that holds the small diameter member in a telescopic manner.

7. 7. The cable drum according to claim 6, wherein the large diameter member is formed in a cylindrical shape to slidably accommodate the small diameter member, and an elastic member for stretching the small diameter member is interposed inside the large diameter member.

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