JP6683597B2 - Foam bobbin - Google Patents

Description

  The present invention relates to a foaming bobbin made of a foaming resin, which is used when winding a wire and storing and transporting the wire.

  2. Description of the Related Art Conventionally, a winding reel (bobbin) made of wood or metal has been used when winding a wire material such as an electric wire and a cable and storing and transporting the wire material. However, a typical wooden or iron take-up reel has a heavy weight of 10 kg or more and is inconvenient to handle, and if the weight of the wire is added, the workability of winding and carrying becomes poor. There is.

  Therefore, a winding reel formed of lightweight foamed resin is known (for example, refer to Patent Document 1). The reel made of foamed resin described in Patent Document 1 is divided at a central portion in the axial direction of a winding core in a reel body, and is configured by a divided body in which a winding core forming portion and one side plate portion are integrated. ing. A concave portion and a convex portion are formed on the joint surface of the divided body, and the divided bodies can be fused to each other by fitting them.

JP, 2004-43148, A

  However, when a wire material having a constant weight such as a metal wire is wound around the reel (bobbin) in multiple layers, a load is generated in the direction of separating the side plate portions on both sides of the winding core due to the load of the wire material. Therefore, in the structure like the reel described in Patent Document 1 in which the divided body is fused at the central portion in the axial direction of the winding core, the divided body may be disassembled during use.

  The present invention has been made to solve the above problems, and an object thereof is to provide a foamed bobbin made of a foamed resin that is not decomposed even when a load of stacked wire rods is applied to the side plate portion. And

In order to achieve the above object, the present invention is a foam bobbin made of a foamed resin, comprising a winding core around which a wire is wound, and a pair of flanges provided at both ends of the winding core, respectively. The bobbin body has a winding core and the flange divided by a cross section including the rotation axes thereof, and the bobbin body has a semi-cylindrical body portion and a pair of semicircles provided at both ends of the body portion. And a side plate part having a shape, wherein the body part and the side plate part are integrally formed, are engaged with the body part and the side plate part, and form a shaft member of the winding core and the flange. Further, the shaft member includes an outer shaft portion that engages with the side plate portion, an inner shaft portion that engages with the body portion, and the outer shaft portion and the inner shaft portion along the rotation axis. And a shaft hole penetrating therethrough, and the outer shaft portion and the body portion are integrally molded of foamed resin. Two of the bobbin body is connected, the winding core is made by the connection of the barrel, wherein said flange by connection of the side plate portions is made.

  In the foam bobbin, it is preferable that the bobbin main bodies have the same shape.

  In the foam bobbin, the outer shaft portion has a polygonal shape in a top view, the inner shaft portion has a larger outer shape in a top view than the outer shaft portion, and the body portion has the inner shaft inside the cylinder. It is preferable that the side plate part has a fitting recess into which the part is fitted, and the side plate part has a notch part into which the outer shaft part is fitted in the center of the straight side thereof.

  In the foam bobbin, the outer shaft portion is symmetrical with respect to a dividing line of the flange in a top view, and a corner portion through which the dividing line passes and a corner portion through which the dividing line does not pass have different shapes. Is preferred.

  According to the foam bobbin of the present invention, the bobbin main body divided by the cross section including the rotation axis is mainly configured, and the side plate portions that are a pair facing each other are integrally configured via the body portion, so that the wire rod is formed. Even if the load is applied to the side plate portion, the flange formed by connecting the side plate portions and the winding core formed by connecting the body portion are not disassembled.

(A) is a perspective view showing a state in which a bobbin main body of a foam bobbin according to an embodiment of the present invention is connected by a shaft member, and (b) is a perspective view showing a state in which the bobbin main body and the shaft member are separated. (A) is a front view of a foam bobbin, (b) is a top view, (c) is a rear view, (d) is a sectional view taken along the line AA of (b), (e) is a BB of (b). FIG. (A) is a perspective view which mainly shows the upper surface of a shaft member, (b) is a perspective view which mainly shows the lower surface. (A) is a front view of a shaft member, (b) is a top view, (c) is a bottom view, (d) is a right side view, (e) is a sectional view taken along the line A'-A 'of (b). FIG. 3A is a perspective view mainly showing a front surface of the bobbin main body, and FIG. (A) is a front view of the bobbin main body, (b) is a rear view, (c) is a top view, (d) is a right side view, and (e) is a sectional view taken along the line A ''-A '' of (a). . The perspective view which shows the use condition of a foam bobbin.

  A foam box according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 (a) and (b) and FIGS. 2 (a) to 2 (e), a foam bobbin 1 of the present embodiment has a core 10 around which a wire is wound, and a pair of cores 10 provided at both ends thereof. And a flange 20 of. Further, the foam bobbin 1 is engaged with the bobbin main body 2 and the bobbin main body 2 obtained by dividing the winding core 10 and the flange 20 in a cross section parallel to the rotation axis Ax (one-dot chain line in the figure). The winding core 10 and the shaft member 3 forming the rotation axis Ax of the flange 20. In the following description, the direction orthogonal to the dividing line Dl (broken line in the figure) of the winding core 10 and the flange 20, and the direction from the lower left to the upper right in the figure is the front view of the foam bobbin 1.

  Both the bobbin main body 2 and the shaft member 3 are molded articles of foamed synthetic resin, and for example, particles for foaming a thermoplastic resin are filled in a mold, heated, and foamed to be integrally molded. The thermoplastic resin is, for example, a styrene resin, or may be a composite resin in which the styrene resin is mixed with another resin such as an olefin resin.

  The bobbin main body 2 has a semi-cylindrical body portion 21, and a pair of semi-circular side plate portions 22 provided at both ends of the body portion 21, respectively. The bobbin main bodies 2 connected by the shaft member 3 have the same shape. Further, in the present embodiment, the shaft members 3 are fitted into both ends of the winding core 10, respectively. That is, the foam bobbin 1 is composed of two bobbin main bodies 2 and two shaft members 3. The peripheral edge of the side plate portion 22 is mainly composed of a semicircular side 22a and a straight side 22b. The straight side 22b serves as a connecting surface with the side plate portion 22 of the other bobbin main body 2 (FIG. 1B), and includes the dividing line Dl of the bobbin main body 2 in a top view (FIGS. 1A and 2B). ) Line BB).

  As shown in FIGS. 3A and 3B and FIGS. 4A to 4E, the shaft member 3 includes an outer shaft portion 31 that engages with the side plate portion 22 and an inner shaft portion that engages with the body portion 21. And a portion 32 (see also FIG. 1B). Further, the shaft member 3 has a shaft hole 33 formed so as to penetrate the outer shaft portion 31 and the inner shaft portion 32 along the rotation axis Ax of the foam bobbin 1. The outer shaft portion 31 and the inner shaft portion 32 are integrally molded (FIG. 3 (e)). In the following description, of the two shaft members 3 shown in the exploded perspective view of FIG. 1B, the surface on the outer shaft portion 31 side is the upper surface and the inner shaft portion is based on the shaft member 3 illustrated above. The surface on the 32 side is the bottom surface, and the direction from the lower left to the upper right of FIG.

  The outer shaft portion 31 has a polygonal shape in a top view, and in the present embodiment, has a substantially square shape (FIGS. 3A and 4B). On the other hand, the outer shape of the inner shaft portion 32 is larger than that of the outer shaft portion 31 in a top view, and is formed in a disk shape in the present embodiment (FIGS. 3B and 4C). The outer shaft portion 31 is symmetrical with respect to the dividing line Dl in a top view. Further, the outer shaft portion 31 has an upper surface 31 a that is a surface parallel to the inner shaft portion 32, and a side surface 31 b that is erected from the inner shaft portion 32 and that connects the upper surface 31 a and the inner shaft portion 32.

  The upper surface 31a is flush with the outer surface 22d (see FIG. 5 described later) of the side plate portion 22 of the bobbin main body 2 (see FIG. 1A). Further, the shaft hole 33 is opened from the upper surface 31a, and the opening edge is chamfered so as to be slightly rounded. Further, a plurality of engagement holes 33a and 33b are opened around the shaft hole 33 from the upper surface 31a. Like the shaft hole 33, these engaging holes 33a and 33b penetrate the outer shaft portion 31 and the inner shaft portion 32 (FIG. 4 (e)), and are wound in order to control the rotation of the foam bobbin 1. A drive shaft or the like (not shown) of the device is inserted. The diameters of the engagement holes 33a and 33b are slightly different, and in the present embodiment, the engagement hole 33a provided at a position where the dividing line Dl passes and the engagement hole 33b provided at a position where the dividing line Dl does not pass. Slightly larger than, but not limited to. The size and width of the drive shaft of the winding device differ depending on the winding device, and the diameters and widths of the engagement holes 33a and 33b can be appropriately changed in design so as to correspond to them.

  In this embodiment, the side surface 31b has four surfaces, and four corner portions 31v and 31r are formed by them. Among them, the corner portion 31v through which the dividing line Dl passes and the corner portion 31r through which the dividing line Dl does not pass have different shapes. Specifically, in the corner portion 31v, the adjacent side surfaces 31b are orthogonal to each other and are substantially right angles in a top view, whereas in the corner portion 31r, the adjacent side surfaces 31b are rounded. The surface is smoothly continuous.

  As shown in FIGS. 5A and 5B and FIGS. 6A to 6E, the bobbin main body 2 includes a semi-cylindrical body portion 21 and a pair of semi-circular side plate portions 22. And they are integrally formed with each other (see also FIG. 2 (d) above). In the following description, of the two bobbin main bodies 2 shown in the exploded perspective view of FIG. 1B, the upper side plate 22 side surface is the upper side and the lower side is the upper side, based on the bobbin main body 2 shown on the upper right side. The side plate portion 22 side surface is the bottom surface, and the surface that directly faces the connecting surface of the bobbin body 2 (the straight side 22b of the side plate portion 22 and the edge surface 21a of the body portion 21) from the lower left to the upper right of FIG. To the front.

  The body portion 21 has a pair of edge surfaces 21a serving as a connecting surface with the body portion 21 of the other bobbin main body 2 and a fitting recess 21b into which the inner shaft portion 32 is fitted. The fitting concave portion 21b is spaced from the inner surface of the side plate portion 22 by the thickness of the inner shaft portion 32 of the shaft member 3 from the inner surface, and is rotated from the inner cylindrical surface 21c of the body portion 21 to the rotation axis Ax (see FIG. )) Direction is extended and it is comprised by 21d. The overhanging portion 21d is cut into an inverted triangular shape that is concave with respect to the rotation axis Ax. In addition, in the illustrated example, the notch of the side plate portion 22 described later has the same shape as the notch of the overhanging portion 21d, but the inner shaft portion 32 of the shaft member 3 can be held, and the two body portions 21 are The shape is not limited to the illustrated shape as long as an opening having at least the diameter of the shaft hole 33 is formed in the body portion 21 (winding core 10) when connected.

  On the pair of edge surfaces 21a, a ridge 21e and a groove 21f are formed at corresponding positions along the direction of the rotation axis Ax. When the two bobbin main bodies 2 are connected, the respective protruding portions 21e and the recessed groove portions 21f are fitted to each other, whereby the respective body portions 21 are locked.

  The side plate portion 22 has a cutout portion 22c in which the outer shaft portion 31 of the shaft member 3 is fitted, at the center of the straight side 22b located on the dividing line Dl of the bobbin main body 2 (FIG. 6C). The notch 22c is cut into an inverted triangular shape that is concave with respect to the rotation axis Ax, and its shape corresponds to the outer shape of the outer shaft portion 31 of the shaft member 3. The location where the R-shaped corner portion 31r of the outer shaft portion 31 abuts is curved into an inner R shape so as to correspond thereto. In this way, by making the side plate portion 22 and the outer shaft portion 31 have shapes corresponding to each other and engaging them with each other, for example, the power applied to the shaft member 3 when attached to the winding device is accurately determined. Can be transmitted to the side plate portion 22 (shaft 20). Further, by making the shapes of the corners 31v, 3r of the shaft member 3 different and the notch 22c of the bobbin main body 2 to have a shape corresponding to that, the shaft member 3 having a substantially square shape in a top view is moved in the wrong direction. It is possible to prevent it from being attached to 2.

  The side plate portion 22 has an outer side surface 22d that forms the upper surface of the bobbin main body 2 and an inner side surface 22e that faces the other side plate portion 22 (FIG. 6B). The ridgeline connecting the inner side surface 22e and the semicircular side 22a is chamfered so as to be slightly rounded. When winding the wire around the winding core 10, the ridge line is likely to come into contact with a wire such as a metal wire. Therefore, by chamfering this ridge line in advance, it is possible to prevent the side plate portion 22 from being damaged.

  The side plate portion 22 has a through hole 22f formed at an outer periphery of the body portion 21 and at a position symmetrical to the division line Dl of the bobbin main body 2. The through hole 22f is formed by cutting a part of the straight side 22b into a semi-elliptical shape, and the two side plate portions 22 are connected to each other. Further, the winding start port 22g for inserting the winding start end of the wire 4 is inserted. (See also FIG. 7 described later).

  In the foam bobbin 1 formed in this way, as shown in FIG. 1B, first, the connecting surfaces of the two bobbin main bodies 2 are opposed to each other, and the two fitting recesses 21 b of one bobbin main body 2 are arranged. Then, the inner shaft portions 32 of the shaft member 3 are fitted respectively, and further, the fitting concave portions 21b of the other bobbin main body 2 are fitted into the inner shaft portions 32 of the shaft member 3. At this time, the protrusion 21e and the groove 21f of the bobbin body 2 are also fitted.

  The inner shaft portion 32 of the shaft member 3 has a larger outer shape than the outer shaft portion 31 and fits into the fitting recess 21b of the bobbin main body 2. Therefore, the shaft member 3 is prevented from falling off in the rotation axis Ax direction. To do. Further, the upper and lower surfaces of the inner shaft portion 32 are in contact with the overhanging portion 21d forming the fitting recess 21b of the bobbin main body 2 and the inner surface of the side plate portion 22. That is, since the inner shaft portion 32 of the shaft member 3 and the fitting recess 21b of the bobbin main body 2 are in contact with each other mainly on a surface orthogonal to the rotation axis Ax, they are orthogonal to the rotation axis Ax due to contact friction between them. The displacement between the bobbin main bodies 2 in the biaxial direction is suppressed, and the connection by the convex streak portion 21e and the concave groove portion 21f is supported. Further, since the ridge portion 21e and the concave groove portion 21f contact each other on the side surface parallel to the rotation axis Ax, it is possible to prevent the bobbin bodies 2 from being displaced from each other in the rotation axis Ax direction due to the contact friction between them. You can As described above, according to the foam bobbin 1 of the present embodiment, it is possible to suppress the displacement between the bobbin main bodies 2 in the three-dimensional direction.

  Further, the foam bobbin 1 of the present embodiment is mainly configured by the bobbin main body 2 divided in a cross section including the rotation axis Ax thereof, and the side plate portions 22 forming a pair facing each other are integrally formed via the body portion 21. It is configured. Therefore, as shown in FIG. 7, even if the wire rod 4 having a constant weight such as a metal wire is wound around the winding core 10 (dotted line in the drawing) in multiple layers, the load of the wire rod 4 is applied to the side plate portion 22. The flange 20 formed by connecting the side plate portions 22 and the winding core 10 formed by connecting the body portions 21 are not disassembled. Further, the two bobbin main bodies 2 are more firmly connected to each other because the connecting surfaces of the two bobbin main bodies 2 are tightened by the wire rod 4 when the wire rod 4 is wound.

  The foam bobbin 1 of the present embodiment is a combination of two bobbin main bodies 2 and two shaft members 3, which is a total of four parts. It is a seed. Therefore, two types of molds are sufficient for manufacturing them, and the production efficiency can be improved. Further, since the shaft hole 33 is formed so as to penetrate the shaft member 3 instead of the connected bobbin main body 2, there is no joint in the shaft hole 33 that is likely to cause damage. Therefore, when the foam bobbin 1 is rotated, it is possible to prevent the shaft hole 33 from being damaged even if a large load is applied to the shaft hole 33 due to the shaft being inserted into the rotation shaft.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, although the outer shaft portion 31 of the shaft member 3 in the above-described embodiment has a substantially square shape (quadrangle), it is divided into a dividing line Dl and a line orthogonal to the dividing line Dl such as a hexagon or an octagon. The shape is not limited to a quadrangle as long as it has a bilaterally symmetrical shape. However, when the corner portion has a large angle, it becomes difficult for the corner portion of the outer shaft portion 31 to be caught in the cutout portion 22c of the side plate portion 22. Therefore, a quadrangle whose corners are substantially right angles is most preferable. Further, in the case of a quadrangle, the amount of protrusion in the direction orthogonal to the dividing line dl is large, so that it is possible to easily secure the space for disposing the engagement hole 33a.

1 Foam Bobbin 10 Winding Core 2 Bobbin Main Body 20 Flange 21 Body 21b Fitting Recess 22 Side Plate 22b Straight Side 22c Notch
22f Through hole 3 Shaft member 31 Outer shaft portion 31r Corner portion 31v Corner portion 32 Inner shaft portion 32a Corner portion 32b Corner portion 33 Shaft hole 4 Wire rod Ax Rotating shaft Dl Dividing line

Claims (4)

A foam bobbin made of foam resin, comprising: a core around which a wire is wound; and a pair of flanges provided at both ends of the core, respectively.
A bobbin main body in which the winding core and the flange are divided by a cross section including the rotation axis thereof;
The bobbin body has a semi-cylindrical body portion and a pair of semi-circular side plate portions provided at both ends of the body portion, respectively, and the body portion and the side plate portion are integrally formed. Formed,
Further comprising a shaft member that is engaged with the body portion and the side plate portion and forms a rotation axis of the winding core and the flange,
The shaft member includes an outer shaft portion that engages with the side plate portion, an inner shaft portion that engages with the body portion, and a shaft hole that penetrates the outer shaft portion and the inner shaft portion along the rotation axis. , And the outer shaft portion and the body portion are integrally formed of foamed resin,
A foam bobbin, wherein two bobbin main bodies are connected to each other, the winding core is formed by connecting the body portions, and the flange is formed by connecting the side plate portions.   The foam bobbin according to claim 1, wherein the bobbin main bodies have the same shape. The outer shaft portion has a polygonal shape in a top view,
The inner shaft portion has a larger outer shape in a top view than the outer shaft portion,
The body has a fitting recess into which the inner shaft is fitted in the cylinder,
The foam bobbin according to claim 1 or 2, wherein the side plate portion has a cutout portion into which the outer shaft portion is fitted, at a center of a straight side thereof . The outer shaft portion is symmetrical with respect to a dividing line of the flange in a top view, and a corner portion through which the dividing line passes and a corner portion through which the dividing line does not pass have different shapes. Item 3. The foam bobbin according to Item 3 .