Cable drum

Abstract

To provide a cable drum that can be assembled / disassembled simply and positively and allows for increasing the loading amount in transportation and saving the space of a place in storage.SOLUTION: A cable drum 1 comprises a cylindrical winding drum portion 10, a pair of flanged portions 20, 20 in an annular plate form that are screwed and fixed to both ends 10a, 10a in an axial direction X of the winding drum portion 10, and a lock portion 30 that regulates the loosening in the axial direction X of the pair of flanged portions 20, 20. The winding drum portion 10, the flanged portions 20 and the lock portion 30 are made of hard plastic.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cable drum used for winding and transporting long and heavy cables such as power cables. [Background technology]

[0002] Generally, cable drums are made of iron, wood, etc. An iron cable drum is described in Patent Document 1. A wooden cable drum is described in Patent Document 2.

[0003] The iron cable drum described in Patent Document 1 includes a cylindrical body, flanges at both ends of the body, and a spiral formed by radially combining supports that support the flanges from the inner periphery. The body and the flanges are bonded together by welding or the like.

[0004] The wooden cable drum described in Patent Document 2 includes a winding section around which the cable is wound, disk-shaped wooden flanges fixed to both ends of the winding section, and a shaft hole formed in the wooden flanges. After the wooden flanges are fixed to both ends of the winding section, they are secured in place with nails or the like. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-95586 A [Patent Document 2] JP 2000-109272 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional cable drums cannot be easily disassembled after assembly. Therefore, when an empty cable drum with no cables wound thereon is transported or stored in an assembled state, dead space is generated during transportation, the loading capacity is reduced, and transportation efficiency is poor. In addition, a large storage space is required for storage.

[0007] The present invention has been made in consideration of the problems inherent in the prior art, and an object of the present invention is to provide a cable drum that can be assembled and disassembled simply and reliably, and that can increase the load capacity during transportation and reduce the storage space required for storage. [Means for solving the problem]

[0008] A cable drum according to one embodiment of the present invention comprises a cylindrical winding trunk portion, a pair of annular plate-shaped flange portions that are screwed into and fixed to both axial ends of the winding trunk portion, and a locking portion that restricts loosening of the pair of flange portions in the axial direction.

[0009] It is preferable that the winding drum portion has an external thread portion at both axial ends of its outer peripheral surface, and the flange portion has an internal thread portion on its inner peripheral surface, and the internal thread portion of the flange portion is screwed into and fixed to the external thread portion of the winding drum portion.

[0010] It is preferable that the locking portion has a plurality of locking projections which respectively engage with an engaging recess formed on the inner circumferential surface of the winding body and an engaging recess formed on the flange.

[0011] The winding drum preferably has an elastic member that restricts loosening of the flange in the axial direction by elastic biasing.

[0012] The body and the flange are preferably made of hard plastic. Effect of the Invention

[0013] According to the present invention, it is possible to provide a cable drum that can be assembled and disassembled simply and reliably, and that can increase the load capacity during transportation and save space during storage. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing an example of a cable drum according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the cable drum. [Diagram 3] FIG. 2 is a perspective view of the body of the cable drum. [Figure 4] FIG. [Diagram 5] FIG. 2 is a perspective view of a flange portion of the cable drum. [Figure 6] FIG. 4 is a perspective view of the locking portion of the cable drum. [Figure 7] FIG. 4 is a partial cross-sectional view showing a main part before the body portion and the flange portion are screwed together. [Figure 8] 4 is a partial cross-sectional view showing a main part after the body portion and the flange portion are screwed together. FIG. [Figure 9] FIG. 2 is a perspective view showing the cable drum in a disassembled and stored state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, a cable drum according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0016] FIG. 1 is a perspective view showing an example of a cable drum according to an embodiment of the present invention. FIG. 2 is a plan view of the cable drum. FIG. 3 is a perspective view of the body of the cable drum. FIG. 4 is a plan view of the body. FIG. 5 is a perspective view of the flange of the cable drum. FIG. 6 is a perspective view of a locking portion of the cable drum. FIG. 7 is a partial cross-sectional view showing the main parts before the body and flange are screwed together. FIG. 8 is a partial cross-sectional view showing the main parts after the body and flange are screwed together. FIG. 9 is a perspective view showing the cable drum disassembled and stored.

[0017] As shown in Figures 1 and 2, the cable drum 1 includes a cylindrical winding trunk portion 10, a pair of annular plate-shaped flange portions 20, 20 that are screwed and fixed to both ends 10a, 10a of the winding trunk portion 10 in the axial direction X, and a locking portion 30 that restricts loosening of the pair of flange portions 20, 20 in the axial direction X.

[0018] 1 to 4, the winding drum 10 is made of a hard plastic material and formed into a cylindrical shape, with a long and heavy power cable (not shown) wound around its outer circumferential surface 11. The winding drum 10 also has external threads 12 at both ends 10a, 10a in the axial direction X of the outer circumferential surface 11. A pair of flanges 20, 20 are screwed and fixed to the outer circumferential surface 11 of the winding drum 10 at both ends 10a, 10a in the axial direction X by the external threads 12, 12 on both ends.

[0019] 2, 7, and 8, four base ends 13a of elastic members 13 that regulate loosening of flange 20 in the axial direction X by elastic biasing of V-shaped elastic piece portions 13b are embedded at equal intervals in each stepped boundary vertical portion 10b between the outer circumferential surface 11 of winding drum 10 and external thread portion 12. The V-shaped elastic piece portions 13b elastically bias the side surface 23c of the inner ring 23 of flange 20, so that the screwed state between the external thread portion 12 of winding drum 10 and the internal thread portion 25 of flange 20 does not loosen, and flange 20 is easily and reliably fixed to winding drum 10.

[0020] As shown in Figs. 1 and 3, a plurality of ribs 16 extend radially from the inner peripheral surface 14 of the winding drum 10 to a small-diameter cylindrical axial hole 15 in the center. The radially extending ribs 16 reduce the weight of the winding drum 10 and improve its durability (strength). The axial hole 15 is located at the center of the winding drum 10, and functions as a bearing when a shaft rod (not shown) of a cable drum support device is inserted into the axial hole 15 during winding and unwinding of the power cable. Furthermore, as shown in Fig. 3, four semispherical recessed engagement recesses 17 that engage with semispherical locking protrusions 34 of a locking portion 30 (described later) are provided at equal intervals between two adjacent ribs 16, 16 on both ends of the inner peripheral surface 14 of the winding drum 10.

[0021] 1 and 5, the flange 20 is made of a hard plastic material and is formed into an annular plate shape, and has an outer ring 21, a middle ring 22, and an inner ring 23 arranged concentrically. A plurality of ribs 24 extend radially between the outer ring 21, the middle ring 22, and the inner ring 23. The plurality of radially extending ribs 24 make it possible to reduce the weight of the flange 20 and improve its durability (strength).

[0022] 1 and 5, the inner ring 23 of the flange portion 20 has an inner thread portion 25 on an inner peripheral surface 23a. The inner thread portion 25 of the flange portion 20 is screwed into and fixed to the outer thread portion 12 of the winding drum portion 10, so that the pair of flange portions 20, 20 has a function of sandwiching and guiding the power cable wound around the outer peripheral surface 11 of the winding drum portion 10 from the axial direction X.

[0023] 5, four pairs of semispherical engagement recesses 26, 26 that engage with a pair of semispherical locking projections 36, 36 of the locking portion 30 (described later) are provided at equal intervals on the outer peripheral surface 24b of the inner ring 23 of the flange portion 20 on both sides of one rib 24. Each pair of engagement recesses 26, 26 is positioned to face the engagement recesses 17 of the winding drum portion 10 when the flange portion 20 is fixed to the winding drum portion 10 by screwing.

[0024] 1 and 6, the locking portion 30 is made of a hard plastic material and has a U-shaped cross section, and includes a trapezoidal plate-shaped base portion 31, an arc-shaped small piece portion 32 standing from one bottom side of the base portion 31, and an arc-shaped large piece portion 33 standing from the other bottom side. The inner peripheral surface 32a of the small piece portion 32 of the locking portion 30 is curved so as to abut against the inner peripheral surface 14 of the winding drum portion 10 without any gap, and has a semispherical locking projection 34 at its center which engages with an engagement recess 17 formed on the inner peripheral surface 14 of the winding drum portion 10.

[0025] 1 and 6, the inner peripheral surface 33a of the large piece portion 33 of the locking portion 30 is curved so as to abut against the outer peripheral surface 23b of the inner ring 23 of the flange portion 20 without any gap, and has a rectangular slit 35 cut out in the center into which the rib 24 of the flange portion 20 is inserted. Furthermore, on both sides of the slit 35 on the inner peripheral surface 33a of the large piece portion 33, there are a pair of semispherical locking projections 36, 36 that engage with a pair of engagement recesses 26, 26 formed on the outer peripheral surface 23b of the inner ring 23 of the flange portion 20. When the inner thread portion 25 of the flange portion 20 is screwed and fixed to the outer thread portion 12 of the winding drum portion 10, the small and large piece portions 32, 33 of the locking portion 30 are sandwiched between the inner peripheral surface 14 of the winding drum portion 10 and the outer peripheral surface 23b of the inner ring 23 of the flange portion 20. In this clamped state, the locking protrusions 34, 36 of the locking portion 30 engage with the engagement recess 17 of the winding drum 10 and the engagement recess 26 of the flange portion 20, respectively, so that the locking portion 30 functions as a rotation prevention member for the flange portion 20 relative to the winding drum 10.

[0026] According to the cable drum 1 of the above embodiment, after the external thread portion 12 of the winding trunk portion 10 and the internal thread portion 25 of the flange portion 20 are screwed together, the cable drum 1 is assembled by inserting the locking projections 34, 36 of the locking portion 30 into the engagement recesses 17, 26 of the winding trunk portion 10 and the flange portion 20. In other words, the cable drum 1 can be assembled easily and reliably without using any tools.

[0027] Furthermore, when storing the cable drum 1, the locking portion 30 can be removed from the reel portion 10 and the pair of flange portions 20, 20, and the screw fastening between the external thread portion 12 and the internal thread portion 25 can be released, allowing the reel portion 10 and the flange portion 20 to be separated for transport and storage without using tools.

[0028] In this way, the cable drum 1 can be assembled and disassembled simply and reliably, which allows for an increase in the load capacity during transportation and a reduction in the storage space required during storage. Furthermore, when assembling the cable drum 1, only a small number of parts are required, making it easy to manage and manufacture the parts.

[0029] 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.

[0030] That is, in the above embodiment, a power cable is wound around the winding drum, but other cables such as a communication cable may also be wound around the winding drum.

[0031] In addition, according to the above embodiment, a plurality of ribs are formed radially on the spool portion and the flange portion to reduce weight and improve durability, but if there are no problems with weight reduction and durability, it is not necessary to form the ribs. [Explanation of symbols]

[0032] 1 Cable drum 10. Winding body 10a,10a both ends 12 External thread 13 Elastic member 14 Inner surface 17 Engagement recess 20,20 A pair of flanges 23a Inner surface 25 Internal thread 26 Engagement recess 30 Locking part 34,36 Locking protrusion X-axis direction

Claims

1. A cylindrical winding body; A pair of annular plate-shaped flanges that are screwed and fixed to both ends of the winding drum in the axial direction; a locking portion that restricts loosening of the pair of flange portions in the axial direction; Equipped with The locking portion has a plurality of locking projections which respectively engage with an engagement recess formed on the inner circumferential surface of the winding body and an engagement recess formed on the flange portion.

2. The winding drum has an outer circumferential surface having an external thread portion at both axial ends thereof, The flange portion has an internal thread portion on an inner circumferential surface, The cable drum according to claim 1 , wherein the internal thread portion of the flange portion is screwed into and fixed to the external thread portion of the winding body portion.

3. 3. The cable drum according to claim 1, wherein the winding body portion has an elastic member that restricts slack in the axial direction of the flange portion by elastic biasing.

4. The cable drum according to claim 1 , wherein the winding body and the flange are made of hard plastic.

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