JP7633080B2 - Cable drum - Google Patents

Description

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

Cable drums are generally made of iron or wood. An iron cable drum is described in Patent Document 1. A wooden cable drum is described in Patent Document 2.

The iron cable drum described in Patent Document 1 comprises a cylindrical body, flanges at both ends of the body, and a spiral consisting of a radial combination of supports that support the flanges from the inner circumference. The body and flanges are then bonded together by welding or other methods.

The wooden cable drum described in Patent Document 2 comprises 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.

JP 2013-95586 A JP 2000-109272 A

However, the conventional cable drums described above cannot be easily disassembled after assembly. Therefore, when an empty cable drum with no cables wound around it is transported or stored, it is in an assembled state, which results in dead space during transportation, a reduced load capacity, and poor transportation efficiency. In addition, a large storage space must be secured when storing the cable drum.

The present invention was made in consideration of the problems inherent in the conventional technology. The object of the present invention is to provide a cable drum that can be assembled and disassembled simply and reliably, allowing for an increased load capacity during transportation and a reduction in storage space.

The cable drum according to this aspect of the invention comprises a cylindrical winding body, a pair of annular plate-shaped flanges that are screwed and fixed to both ends of the winding body in the axial direction, and a locking portion that prevents the pair of flanges from loosening in the axial direction.

It is preferable that the winding body has an external thread on both axial ends of its outer circumferential surface, and the flange has an internal thread on its inner circumferential surface, and that the internal thread of the flange is screwed into and fixed to the external thread of the winding body.

It is preferable that the locking portion has a plurality of locking projections that respectively engage with an engagement recess formed on the inner peripheral surface of the spool portion and an engagement recess formed on the flange portion.

It is preferable that the spool portion has an elastic member that uses an elastic force to restrict loosening of the flange portion in the axial direction.

The body and flange are preferably made of hard plastic.

The present invention provides a cable drum that can be assembled and disassembled simply and reliably, allowing for an increased load capacity during transportation and space savings during storage.

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. 2 is a perspective view of the body of the cable drum. FIG. FIG. 2 is a perspective view of a flange portion of the cable drum. FIG. 4 is a perspective view of the locking portion of the cable drum. FIG. 4 is a partial cross-sectional view showing a main part before the body portion and the flange portion are screwed together. 4 is a partial cross-sectional view showing a main part after the body portion and the flange portion are screwed together. FIG. FIG. 2 is a perspective view showing the cable drum in a disassembled and stored state.

The cable drum according to an embodiment of the present invention will be described in detail below with reference to the drawings.

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

As shown in Figures 1 and 2, the cable drum 1 includes a cylindrical reel 10, a pair of annular flanges 20, 20 that are screwed and fixed to both ends 10a, 10a of the reel 10 in the axial direction X, and a locking portion 30 that prevents the pair of flanges 20, 20 from loosening in the axial direction X.

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

Furthermore, as shown in Figures 2, 7, and 8, the base end 13a of the elastic member 13 that regulates the loosening of the flange 20 in the axial direction X by the elastic bias of the V-shaped elastic piece 13b is embedded at four equal intervals in each step-shaped boundary vertical portion 10b between the outer circumferential surface 11 of the winding drum 10 and the external thread portion 12. The V-shaped elastic piece 13b elastically biases the side surface 23c of the inner ring 23 of the flange 20, so that the screwed state of the external thread portion 12 of the winding drum 10 and the internal thread portion 25 of the flange 20 does not loosen, and the flange 20 is easily and reliably fixed to the winding drum 10.

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

As shown in Figures 1 and 5, the flange 20 is made of hard plastic material and is formed in the shape of a circular plate, with an outer ring 21, a middle ring 22, and an inner ring 23 arranged concentrically. A number of ribs 24 extend radially between the outer ring 21, the middle ring 22, and the inner ring 23. These radially extending ribs 24 reduce the weight of the flange 20 and improve its durability (strength).

As shown in Figs. 1 and 5, the inner ring 23 of the flange 20 has an internal thread 25 on the inner peripheral surface 23a. The internal thread 25 of the flange 20 is screwed into and fixed to the external thread 12 of the winding drum 10, so that the pair of flanges 20, 20 has the function of clamping and guiding the power cable wound around the outer peripheral surface 11 of the winding drum 10 in the axial direction X.

Furthermore, as shown in FIG. 5, the outer peripheral surface 24b of the inner ring 23 of the flange 20 has a pair of semispherical engagement recesses 26, 26 at equal intervals on both sides of one rib 24. The pair of engagement recesses 26, 26 engage with a pair of semispherical engagement protrusions 36, 36 of the engagement portion 30 described below. Each pair of engagement recesses 26, 26 is positioned to face the engagement recesses 17 of the winding drum 10 when the flange 20 is fixed to the winding drum 10 by screwing.

As shown in Figures 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 surface 32a of the small piece portion 32 of the locking portion 30 is curved so as to abut tightly against the inner surface 14 of the winding drum portion 10, and has a semispherical locking projection 34 at its center which engages with an engagement recess 17 formed on the inner surface 14 of the winding drum portion 10.

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 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. Then, 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 pieces 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 sandwiched state, the locking projections 34, 36 of the locking portion 30 engage with the engagement recesses 17 of the reel body 10 and the engagement recesses 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 reel body 10.

According to the cable drum 1 of the above embodiment, after the external thread portion 12 of the winding body 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 body 10 and the flange portion 20. In other words, the cable drum 1 can be assembled easily and reliably without using tools.

When storing the cable drum 1, the locking portion 30 is 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 is released, allowing the reel portion 10 and the flange portion 20 to be separated for transport and storage without using tools.

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. In addition, when assembling the cable drum 1, only a small number of parts are required, making it easy to manage and manufacture the components.

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

That is, in the above embodiment, a power cable is wound around the reel, but other cables such as a communication cable may also be wound around the reel.

In addition, according to the above embodiment, multiple ribs are formed radially on the spool and flange to reduce weight and improve durability, but if there are no issues with weight reduction and durability, it is not necessary to form ribs.

REFERENCE SIGNS LIST 1 cable drum 10 winding body portion 10a, 10a both ends 12 external thread portion 13 elastic member 14 inner peripheral surface 17 engagement recess 20, 20 pair of flange portions 23a inner peripheral surface 25 internal thread portion 26 engagement recess 30 engagement portion 34, 36 engagement protrusion X axial direction

Claims (4)

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

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