JP2018108877A - Foamed bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foamed bobbin which is not disassembled, even when a load of a wire is applied to a side plate portion.SOLUTION: A foamed bobbin 1 includes a wiring core 10 around which a wire is wound and a pair of flanges 20 provided at both ends of the wiring core 10, respectively, and has a bobbin body 2 divided by a cross section including a rotation axis Ax of the wiring core 10 and the flanges 20. The bobbin body 2 has a semicylindrical body portion 21, a pair of semicircular side plate portions 22 respectively provided at both ends of the body portion 21, and the body portion 21 and the side plate portions 22 are integrally formed. Two body portions 21 are connected to form a core 10, and two pairs of side plate portions 22 are connected to form a flange 20. The opposed pair of side plate portions 22 are integrally formed through the body portion 21, and therefore even if a load of the wire is applied to the side plate portions 22, the flange 20 formed by the connection of the side plate portions 22 and the wiring core 10 formed by the connection of the body portions 21 are not disassembled.SELECTED DRAWING: Figure 1

Description

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

  Conventionally, a wooden or metal winding reel (bobbin) has been used when winding a wire such as an electric wire and a cable and storing and transporting the wire. However, a general wooden or iron take-up reel has a heavy weight of 10 kg or more, which is inconvenient to handle, and if the weight of the wire is added, the workability of winding and transporting deteriorates. There is.

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

JP 2004-43148 A

  However, when a wire having a certain weight, such as a metal wire, is wound around a reel (bobbin) several times, 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. Therefore, in the configuration in which the divided body is fused at the central portion in the axial direction of the winding core, such as the reel described in Patent Document 1, the divided body may be decomposed during use.

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

  In order to achieve the above object, the present invention is a foamed bobbin made of foamed resin comprising a winding core around which a wire is wound and a pair of flanges respectively provided at both ends of the winding core, A bobbin main body in which a winding core and the flange are divided by a cross section including their rotation axes, and the bobbin main body includes a semi-cylindrical body part and a pair of semicircles provided at both ends of the body part The body part and the side plate part are formed integrally, the two bobbin bodies are connected, and the winding core is formed by the connection of the body part, and the side plate The flange is formed by connecting the parts.

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

  The foamed bobbin further includes a shaft member that is engaged with the body portion and the side plate portion and that forms a rotating shaft of the winding core and the flange, and the shaft member is an outer shaft portion that engages with the side plate portion. And an inner shaft portion engaged with the body portion, and a shaft hole penetrating the outer shaft portion and the inner shaft portion along the rotation axis.

  In the foamed 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 in the cylinder. Preferably, the side plate portion has a notch portion into which the outer shaft portion is fitted at the center of the straight side.

  In the foam bobbin, the outer shaft portion is bilaterally symmetric 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 are different in shape. Is preferred.

  According to the foam bobbin of the present invention, the bobbin main body divided in a cross section including the rotation shaft is mainly configured, and the opposing side plate portions are integrally configured via the body portion. Even if the load is applied to the side plate portion, the flange due to the connection of the side plate portion and the winding core due to the connection of the trunk portion are not disassembled.

(A) is a perspective view which shows the state which connected the bobbin main body of the foam bobbin which concerns on one Embodiment of this invention with the shaft member, (b) is a perspective view which shows the state which isolate | separated the bobbin main body and the shaft member. (A) is a front view of a foam bobbin, (b) is a top view, (c) is a rear view, (d) is a cross-sectional view along line AA in (b), and (e) is a cross-sectional view along BB in (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, and (e) is a sectional view taken along line A'-A 'in (b). (A) is a perspective view which mainly shows the front of a bobbin main body, (b) is a perspective view which mainly shows a back surface. (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 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 1 (b) and FIGS. 2 (a) to 2 (e), the foam bobbin 1 of the present embodiment includes a winding core 10 around which a wire is wound and a pair provided at both ends thereof. The flange 20 is provided. Further, the foam bobbin 1 is engaged with the bobbin main body 2 obtained by dividing the winding core 10 and the flange 20 in a cross section including the rotation axis Ax (the chain line in the drawing) and parallel thereto, And the shaft member 3 that forms the rotation axis Ax of the winding core 10 and the flange 20. In the following description, the direction perpendicular to the dividing line Dl (broken line in the figure) of the winding core 10 and the flange 20 is the front view of the foam bobbin 1 from the lower left to the upper right in the figure.

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

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

  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 that engages with the body portion 21. Part 32 (see also FIG. 1B). 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. 3E). 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 in FIG.

  The outer shaft portion 31 has a polygonal shape in a top view, and in this embodiment, has a substantially square shape (FIGS. 3A and 4B). On the other hand, the inner shaft portion 32 has a larger outer shape in a top view than the outer shaft portion 31, and is formed in a disk shape in the present embodiment (FIGS. 3B and 4C). The outer shaft portion 31 is bilaterally symmetric with respect to the dividing line Dl when viewed from above. The outer shaft portion 31 includes an upper surface 31 a that forms a plane parallel to the inner shaft portion 32, and a side surface 31 b that stands from the inner shaft portion 32 and 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 body 2 (see FIG. 1A). Further, a shaft hole 33 is opened from the upper surface 31a, and the opening edge is chamfered to be slightly rounded. A plurality of engagement holes 33 a and 33 b are opened around the shaft hole 33 from the upper surface 31 a. These engagement holes 33a and 33b penetrate the outer shaft portion 31 and the inner shaft portion 32 as in the case of the shaft hole 33 (FIG. 4 (e)), and in order to control the rotation of the foam bobbin 1, the winding is performed. A drive shaft or the like (not shown) of the apparatus is inserted. The diameters of the engaging holes 33a and 33b are slightly different. In this embodiment, the engaging hole 33a provided at a position where the dividing line Dl passes is engaged with the engaging hole 33b provided at a position where the dividing line Dl does not pass. It is slightly larger than, but is not limited to this. The size and width of the drive shaft of the winding device vary 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 cope with them.

  In the present embodiment, there are four side surfaces 31b, 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, the side 31b of the corner 31v is orthogonal to each other and is substantially right-angled when viewed from above, whereas the corner 31r has an R shape in which the sides 31b are rounded. Smooth and continuous with the surface.

  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 semicircular side plate portions 22. And they are formed integrally 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 an upper surface and a lower surface based on the bobbin main body 2 shown in the upper right. The surface on the side plate 22 side of the bottom surface, from the lower left to the upper right in FIG. 1B, that is, the surface facing the connecting surface of the bobbin main body 2 (the straight side 22b of the side plate 22 and the edge surface 21a of the body 21). Is the front.

  The body portion 21 has a pair of edge surfaces 21a that serve as a connection surface with the body portion 21 of the other bobbin main body 2, and a fitting recess 21b in which the inner shaft portion 32 is fitted in the cylinder. The fitting recess 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 to the rotation axis Ax (see FIG. 6A). )) And a protruding portion 21d extending in the direction. The projecting portion 21d is cut into an inverted triangular shape that is concave with respect to the rotation axis Ax. In the illustrated example, the notch of the overhang portion 21d has the same shape as a notch portion of the side plate portion 22 to be described later. However, the inner shaft portion 32 of the shaft member 3 can be held, and the two barrel portions 21 are provided. The shape is not limited to the illustrated shape as long as an opening larger than 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, along the direction of the rotation axis Ax, convex ridge portions 21e and concave groove portions 21f are respectively formed at corresponding positions. When the two bobbin main bodies 2 are coupled, the protruding portions 21e and the recessed grooves 21f are engaged with each other so that the body portions 21 are locked.

  The side plate portion 22 has a cutout portion 22c into 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 22 c is cut into an inverted triangular shape that is concave with respect to the rotation axis Ax, and the shape thereof corresponds to the outer shape of the outer shaft portion 31 of the shaft member 3. The portion of the outer shaft portion 31 where the R-shaped corner portion 31r abuts is curved in an inner R shape so as to correspond thereto. In this way, the side plate portion 22 and the outer shaft portion 31 have shapes corresponding to each other, and are engaged with each other, for example, when the power applied to the shaft member 3 is accurately attached when the side plate portion 22 and the outer shaft portion 31 are attached to the winding device. Can be transmitted to the side plate portion 22 (shaft 20). Further, the shape of the corner portions 31v and 3r of the shaft member 3 is made different, and the notch portion 22c of the bobbin body 2 is made to have a shape corresponding thereto, so that the substantially square shaft member 3 in the top view is in the wrong direction. 2 can be prevented from being attached.

  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 to be slightly rounded. This ridge line is easy to come into contact with a wire such as a metal wire when the wire is wound around the winding core 10. Therefore, it is possible to prevent the side plate portion 22 from being damaged by chamfering the ridge line in advance.

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

  As shown in FIG. 1B, the foamed bobbin 1 formed in this way first has the connecting surfaces of the two bobbin bodies 2 facing each other, and two fitting recesses 21b of the one bobbin body 2 are located. The inner shaft portion 32 of the shaft member 3 is fitted into the inner shaft portion 32, and the fitting recess 21 b of the other bobbin body 2 is fitted into the inner shaft portion 32 of the shaft member 3. At this time, the ridge portion 21e and the concave groove portion 21f of the bobbin main 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 is fitted in the fitting recess 21b of the bobbin main body 2, so that the shaft member 3 is prevented from falling off in the direction of the rotation axis Ax. To do. Further, the upper and lower surfaces of the inner shaft portion 32 are in contact with the overhanging portion 21 d constituting the fitting recess 21 b of the bobbin body 2 and the inner surface of the side plate portion 22. That is, 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, and therefore 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 strip portion 21e and the concave groove portion 21f is supported. Moreover, since the protruding line part 21e and the concave groove part 21f contact each other on the side surface parallel to the rotation axis Ax, it is possible to suppress the bobbin bodies 2 from being displaced in the direction of the rotation axis Ax due to contact friction between them. Can do. Thus, according to the foamed bobbin 1 of this embodiment, the shift | offset | difference in the three-dimensional direction of the bobbin main bodies 2 can be suppressed.

  Further, the foam bobbin 1 of the present embodiment is mainly configured by a bobbin main body 2 divided by a cross section including the rotation axis Ax, and the opposing side plate portions 22 are integrally formed through the body portion 21. It is configured. Therefore, as shown in FIG. 7, even when the wire 4 having a constant weight such as a metal wire is wound around the winding core 10 (dotted line in the drawing) and the load of the wire 4 is applied to the side plate portion 22. The flange 20 due to the connection of the side plate part 22 and the winding core 10 due to the connection of the body part 21 are not disassembled. In addition, the two bobbin bodies 2 are more firmly connected since their connecting surfaces are fastened by the wire 4 in a state where the wire 4 is wound.

  The foam bobbin 1 of this embodiment is a combination of a total of four parts, ie, two bobbin bodies 2 and two shaft members 3, but the bobbin body 2 and the shaft member 3 have the same shape. It is a seed. Accordingly, two types of molds are sufficient for the production thereof, and the production efficiency can be improved. Further, since the shaft hole 33 is formed so as to penetrate the shaft member 3, not the connected bobbin main body 2, there is no joint that tends to cause breakage in the shaft hole 33. Therefore, when the foam bobbin 1 is rotated, the shaft hole 33 can be prevented 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, the outer shaft portion 31 of the shaft member 3 in the above embodiment has a substantially square (quadrangular) shape. However, for example, the dividing line Dl and a line orthogonal to the dividing line Dl such as a hexagonal shape and an octagonal shape are used. The shape is not limited to a quadrangle as long as the shape is bilaterally symmetric. However, when the corner portion has a large angle, the corner portion of the outer shaft portion 31 is hardly caught by the notch portion 22 c of the side plate portion 22. Therefore, a quadrangle whose corners are substantially perpendicular is most preferable. In addition, since the amount of protrusion in the direction orthogonal to the dividing line dl is increased in the case of a quadrangle, it is possible to easily secure the arrangement space of the engagement holes 33a.

DESCRIPTION OF SYMBOLS 1 Foam bobbin 10 Winding core 2 Bobbin main body 20 Flange 21 The trunk | drum 21b Fitting recessed part 22 Side plate part 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 (5)

A foamed bobbin made of foamed resin comprising a winding core around which a wire is wound, and a pair of flanges respectively provided at both ends of the winding core,
It has a bobbin body in which the winding core and the flange are divided by a cross section including their rotation axes,
The bobbin main body includes a semi-cylindrical body portion and a pair of semicircular side plate portions provided at both ends of the body portion, and the body portion and the side plate portion are integrally formed. Formed,
A foamed bobbin characterized in that two bobbin bodies are connected, 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 all of the bobbin bodies have the same shape. A shaft member that is engaged with the body portion and the side plate portion and that 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. The foamed bobbin according to claim 1 or 2, characterized by comprising: The outer shaft portion is polygonal in top view,
The inner shaft portion has a larger outer shape in a top view than the outer shaft portion,
The trunk portion has a fitting recess into which the inner shaft portion is fitted in the cylinder,
The foamed bobbin according to claim 3, wherein the side plate portion has a cutout portion into which the outer shaft portion is fitted in the center of the straight side.   The outer shaft portion is symmetric 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 5. The foamed bobbin according to Item 4.