Cord reel

Abstract

To provide a cord reel that can be made compact.SOLUTION: A first spiral spring 9A and a second spiral spring 9B are disposed outside a winding drum 5, and a first spring casing 11A and a second spring casing 11B are disposed adjacent to the winding drum 5. As a result, the inner diameter dimension of the winding drum 5 associated with the cord reel is not affected by the sizes of the first spiral spring 9A and the second spiral spring 9B. Therefore, the outer diameter dimension of the winding drum 5 is not increased due to the sizes of the first spiral spring 9A and the second spiral spring 9B, so that it may be possible to reduce the size of the cord reel.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a cord reel for winding up an electrical cord. [Background technology]

[0002] For example, the cord reel described in Patent Document 1 has a configuration in which a metal spiral spring is housed inside the winding drum, and an electric cord can be electrically connected to the outside via the spiral spring. The spiral spring is a spirally curved leaf spring that exerts an elastic force on the winding drum in a direction to wind up the electric cord. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-187675 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the cord reel described in Patent Document 1, since a spiral spring is housed inside the winding drum, the inner diameter of the winding drum is necessarily larger than the outer dimension of the spiral spring. Therefore, in the cord reel described in Patent Document 1, the outer diameter of the winding drum is large, making it difficult to reduce the size of the cord reel.

[0005] In view of the above, the present disclosure discloses an example of a cord reel that can be made compact. [Means for solving the problem]

[0006] It is desirable for the cord reel that winds up the electric cord (3) to have at least one of the following configuration features, for example. That is, the components are a winding drum (5) for winding up the electric cord (3), a shaft (7A) that supports the winding drum (5) and rotates integrally with the winding drum (5), a metal spiral spring (9A) that applies an elastic force to the winding drum (5) in the direction of winding up the electric cord (3) and a spring casing (11A) that houses the spiral spring (9A) and rotatably supports the shaft (7A).

[0007] The central side of the spiral spring (9A) is engaged with the shaft (7A), the outer peripheral end side of the spiral spring (9A) is engaged with a spring casing (11A), the central side of the spiral spring (9A) is indirectly or directly connected to an electric wire of an electric cord (3), and the outer peripheral end side of the spiral spring (9A) is indirectly or directly connected to a lead wire (13A) connected to the outside. Furthermore, it is desirable that the spiral spring (9A) is disposed outside the winding drum (5), and the spring casing (11A) is disposed adjacent to the winding drum (5).

[0008] As a result, the inner diameter of the winding drum (5) for the cord reel is not affected by the size of the spiral spring (9A). Therefore, the outer diameter of the winding drum (5) is not increased due to the size of the spiral spring (9A), so it is possible to reduce the size of the cord reel.

[0009] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an external view of a cord reel according to a first embodiment. [Diagram 2] FIG. 2 is an exploded view of the cord reel according to the first embodiment. [Diagram 3] FIG. 2 is a diagram showing a take-up drum according to the first embodiment. [Figure 4] FIG. 2 is a diagram showing the structure of a winding drum according to the first embodiment. [Diagram 5] FIG. 2 is a diagram showing a take-up drum according to the first embodiment. [Figure 6] FIG. 2 is a diagram showing a take-up drum according to the first embodiment. [Figure 7] FIG. 2 is a diagram showing a winding drum and a spiral spring according to the first embodiment. [Figure 8] FIG. 2 is a diagram showing a winding drum and a spiral spring according to the first embodiment. [Figure 9] FIG. 2 is a diagram showing a winding drum and a spiral spring according to the first embodiment. [Figure 10] FIG. 4 is a diagram showing a first spring casing according to the first embodiment. [Figure 11] FIG. 4 is a view showing a second spring casing according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiment.

[0012] In addition, arrows and diagonal lines indicating directions in each figure are provided to facilitate understanding of the relationship between the figures and the shapes of each member or part. Therefore, the invention shown in this disclosure is not limited to the directions indicated in each figure. Diagonal lines do not necessarily indicate cross-sectional views.

[0013] At least one of each of the components or parts described with a reference symbol is provided, unless otherwise specified by "one". In other words, unless otherwise specified by "one", two or more of the components may be provided. The cord reel shown in this disclosure includes at least the components or parts described with a reference symbol, and at least one of the structural parts shown in the drawings.

[0014] (First embodiment) <1. Overview of cord reels> The cord reel 1 shown in Fig. 1 is an example of a cord reel according to the present disclosure. The cord reel 1 is a cord reel that winds up an electric cord 3 for transmitting electric signals and supplying power. Note that the electric cord 3 according to this embodiment is a two-core cord in which two electric wires are bundled together.

[0015] <2. Cord reel configuration> As shown in FIG. 2, the cord reel 1 at least includes a winding drum 5, a first shaft 7A, a second shaft 7B, a first spiral spring 9A, a second spiral spring 9B, a first spring casing 11A, a second spring casing 11B, a first lead wire 13A, and a second lead wire 13B.

[0016] <Winding drum> The winding drum 5 is a rotating body for winding up the electric cord 3. The winding drum 5 has a drum main body 5A and flange portions 5B, 5C, etc. The drum main body 5A is a cylindrical portion for winding up the electric cord 3.

[0017] The flange portions 5B and 5C are brim-shaped portions provided on one end side and the other end side in the rotational axis direction of the drum body 5A. Note that the winding drum 5 according to this embodiment is an integrated product in which the drum body 5A and the flange portions 5B and 5C are integrally molded from resin.

[0018] <First shaft 7, second shaft> The first shaft 7A and the second shaft 7B are shaft members that support the winding drum 5 and rotate integrally with the winding drum 5. The first shaft 7A is disposed on one end side of the winding drum 5 in the direction of the rotation center axis and is connected to the winding drum 5.

[0019] The second shaft 7B is disposed on the opposite side of the winding drum 5 to the first shaft 7A and is connected to the winding drum 5 (see FIG. 3). Hereinafter, the two shafts 7A and 7B will be referred to collectively as shaft 7.

[0020] 4, each shaft 7 has an engagement portion 7C, a bearing portion 7D, a locked portion 7E, etc. Each engagement portion 7C is a portion that is fitted into a hub 5D of the winding drum 5 in a state of being engaged with the hub 5D.

[0021] The engagement portions 7C are spaced apart from each other in the rotation axis direction Lo. In this embodiment, a resin partition wall 5E is provided between the engagement portions 7C. Therefore, the first shaft 7A and the second shaft 7B are electrically insulated from each other.

[0022] Each bearing portion 7D is a portion that constitutes a plain bearing portion. Each locked portion 7E is a slit-shaped portion to which the first spiral spring 9A and the second spiral spring 9B are locked. Each shaft 7 is an integral part that is integrally molded from metal with the engagement portion 7C and the bearing portion 7D.

[0023] One electric wire 3A (see FIG. 5) of the electric cord 3 is electrically connected to the first shaft 7A, and the other electric wire 3B (see FIG. 6) of the electric cord 3 is electrically connected to the second shaft 7B.

[0024] 5 and 6, the electric wires 3A, 3B are connected to the corresponding shafts 7 via terminals 3C such as round terminals or CB terminals. The machine screws 3D that fix the terminals 3C also serve as fall-off prevention parts that prevent the shafts 7 from falling off the hub 5D.

[0025] <First main spring, second main spring> The first spiral spring 9A and the second spiral spring 9B apply an elastic force to the winding drum 5 in the direction in which the electric cord 3 is wound, and are metallic springs configured in a spiral shape.

[0026] 7, the first spiral spring 9A is disposed on one end side of the winding drum 5 in the direction of the rotation center axis. Specifically, the first spiral spring 9A is disposed outside the winding drum 5 on one end side of the winding drum 5 in the direction of the rotation center axis.

[0027] The second spiral spring 9B is disposed on the opposite side to the first spiral spring 9A across the winding drum 5. Specifically, the second spiral spring 9B is disposed outside the winding drum 5 on the other end side of the winding drum 5 in the direction of the rotation center axis.

[0028] 8, the center side of the first spiral spring 9A is locked to the locked portion 7E of the first shaft 7A. Therefore, one electric wire 3A of the electric cord 3 is electrically connected indirectly to the center side of the first spiral spring 9A via the first shaft 7A.

[0029] 9, the center side of the second spiral spring 9B is locked to the locked portion 7E of the second shaft 7B. Therefore, the other electric wire 3B of the electric cord 3 is electrically connected indirectly to the center side of the second spiral spring 9B via the second shaft 7B.

[0030] <First spring casing, second spring casing> As shown in FIG. 10, the first spring casing 11A is a case member that is disposed adjacent to the winding drum 5 to house the first spiral spring 9A and rotatably support the first shaft 7A.

[0031] The outer peripheral end side of the first spiral spring 9A is engaged with the first spring casing 11A and is directly connected to the first lead wire 13A. The first lead wire 13A is an electric wire connected to the outside. As a result, one electric wire 3A of the electric cord 3 is electrically connected to the first lead wire 13A via the first shaft 7A and the first spiral spring 9A.

[0032] As shown in FIG. 11, the second spring casing 11B is a case member that is disposed adjacent to the winding drum 5 to house the second spiral spring 9B and rotatably supports the second shaft 7B.

[0033] The outer peripheral end side of the second spiral spring 9B is engaged with the second spring casing 11B and is directly connected to the second lead wire 13B. The second lead wire 13B is an electric wire connected to the outside. As a result, the other electric wire 3B of the electric cord 3 is electrically connected to the second lead wire 13B via the second shaft 7B and the second spiral spring 9B.

[0034] The first spring casing 11A on the side of the first spiral spring 9A is covered by a first cover casing 11C (see FIG. 1), and the second spring casing 11B on the side of the second spiral spring 9B is covered by a second cover casing 11D (see FIG. 1).

[0035] The first spring casing 11A, the second spring casing 11B, the first lid casing 11C and the second lid casing 11D are made of resin, and are fastened to one another by bolts or screws.

[0036] <3. Features of the cord reel according to this embodiment> The first spiral spring 9A and the second spiral spring 9B are disposed outside the winding drum 5, and the first spring casing 11A and the second spring casing 11B are disposed adjacent to the winding drum 5.

[0037] As a result, the inner diameter dimension of the winding drum 5 for the cord reel 1 is not affected by the sizes of the first spiral spring 9A and the second spiral spring 9B. Therefore, since the outer diameter dimension of the winding drum 5 is not increased due to the influence of the sizes of the first spiral spring 9A and the second spiral spring 9B, it may be possible to reduce the size of the cord reel 1.

[0038] In this embodiment, assembly of the cord reel 1 is completed by sequentially assembling the first spiral spring 9A, the second spiral spring 9B, and the first spring casing 11A and the second spring casing 11B to the outside of the winding drum 5, so it may be possible to reduce the size of the cord reel 1 while suppressing an increase in assembly man-hours.

[0039] (Other embodiments) In the above-described embodiment, the electric wires 3A, 3B of the electric cord 3 are indirectly electrically connected to the first spiral spring 9A and the second spiral spring 9B via the first shaft 7A and the second shaft 7B. However, the present disclosure is not limited to this.

[0040] In other words, the disclosure may be, for example, a configuration in which the electric wires 3A, 3B of the electric cord 3 are electrically connected directly to the first spiral spring 9A and the second spiral spring 9B without passing through the first shaft 7A and the second shaft 7B.

[0041] In the above embodiment, the electric cord 3 has two cores, and therefore includes two spiral springs and two spring casings. However, the present disclosure is not limited to this. That is, in the case of a single-core electric cord, for example, one spiral spring and one spring casing are sufficient. In this case, the first shaft 7A and the second shaft 7B may be integrated into one shaft 7.

[0042] In the above embodiment, the resin partition wall 5E is provided between the first shaft 7A and the second shaft 7B. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the partition wall 5E is eliminated and a gap is provided.

[0043] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0044] 1... Cord reel 3... Electric cord 3A, 3B... Electric line 5... Winding drum 7A... First shaft 7B... Second shaft 9A... First mainspring 9B... Second mainspring 11A... Spring casing 11B... Spring casing 11C… First lid casing 11D… Second lid casing 13A... 1st lead wire 13B... 2nd lead wire

Claims

1. In a cord reel for winding up an electric cord, a winding drum for winding up the electrical cord; A shaft that supports the winding drum and rotates integrally with the winding drum; a metal spiral spring that applies an elastic force to the winding drum in a direction in which the electric cord is wound; a spring casing that houses the spiral spring and rotatably supports the shaft, a center side of the spiral spring is engaged with the shaft, and an outer peripheral end side of the spiral spring is engaged with the spring casing, The electric wire of the electric cord is indirectly or directly connected to the center side of the spiral spring, and a lead wire connected to the outside is indirectly or directly connected to the outer circumferential end side of the spiral spring, Further, the power spring is disposed outside the winding drum, and the spring casing is disposed adjacent to the winding drum.

2. When the shaft is a first shaft, the spiral spring is a first spiral spring, the spring casing is a first spring casing, and the lead wire is a first lead wire, A second shaft that supports the winding drum and rotates integrally with the winding drum, the second shaft being disposed on the opposite side of the winding drum from the first shaft; a second spiral spring that is made of metal and is arranged on the opposite side of the winding drum from the first spiral spring, the second spiral spring applying an elastic force to the winding drum in a direction to wind the electric cord; a second spring casing disposed on the opposite side of the winding drum from the first spring casing, the second spring casing housing the second spiral spring and rotatably supporting the second shaft; A center side of the second spiral spring is engaged with the second shaft, and an outer peripheral end side of the second spiral spring is engaged with the second spring casing, 2. The cord reel according to claim 1, further comprising: a first lead wire connected to the first spiral spring; a second lead wire connected to the second spiral spring; and a second lead wire connected to the outside.

3. the first shaft and the second shaft are made of metal; 3. The cord reel according to claim 2, wherein the one electric wire is connected to the first shaft, and the other electric wire is connected to the second shaft.

4. The winding drum is made of resin, 4. The cord reel according to claim 3, wherein the first shaft and the second shaft are spaced apart from each other in the direction of the rotation axis and are electrically insulated from each other.

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