JP3706498B2 - Lead wire take-out structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead wire take-out structure for pulling out a lead wire from a case via a rubber bush that is elastically deformed.
[0002]
[Prior art]
The case has a rubber bush connected to the part from which the lead wire is drawn. The rubber bush is connected to an opening provided in the case and attached so as to penetrate the case. This rubber bushing has a lead wire inserted through the center, and protects the lead wire at the take-out portion of the case. The rubber bush is elastically deformed together with the lead wire to protect the lead wire.
[0003]
The rubber bush is designed to pull out the lead wire in a direction perpendicular to the case surface. For this reason, in order to pull out the lead wire in parallel with the case surface, it is necessary to provide the protrusion 5 on the surface of the case 1 and to attach the rubber bush 2 to the side surface of the protrusion 5 as shown in FIGS. is there.
[0004]
[Problems to be solved by the invention]
As shown in FIGS. 1 and 2, the structure in which the rubber bush 2 is mounted on the side surface of the protrusion 5 needs to bend the lead wire 3 at a right angle inside the protrusion 5. For this reason, it is necessary to enlarge the protrusion part 5. FIG. Furthermore, since the lead wire 3 is bent at a right angle with a small curvature radius, an excessive force acts on the lead wire 3 at the bent portion. This causes the lead wire 3 to be disconnected. Since the lead wire 3 is particularly easily disconnected at the portion connected to the case 1, it is extremely important how the disconnection at this portion can be reduced. Furthermore, the failure that cannot be used due to the disconnection of the lead wire accounts for a large percentage of the total failure of the electronic device. For this reason, it is extremely important to reduce the disconnection of the lead wires in this portion.
[0005]
The present invention was developed for the purpose of providing a lead wire take-out structure that allows a lead wire to be taken out parallel to the case surface without applying an excessive force to the portion connecting the lead wire to the case. It is a thing.
[0006]
Furthermore, another important object of the present invention is to provide a lead wire take-out structure in which a lead wire can be taken out parallel to the surface of the case and the portion connecting the rubber bush can be made compact.
[0007]
[Means for Solving the Problems]
In the lead wire take-out structure of the present invention, the rubber bush 2 is connected through the case 1. A lead wire 3 is inserted into the rubber bush 2, and the lead wire 3 is connected to the case 1 via the rubber bush 2.
[0008]
Furthermore, in the lead wire take-out structure according to the first aspect of the present invention, the protruding portion 5 is provided at a portion where the rubber bush 2 of the case 1 is connected. The protrusion 5 is an inclined surface 5A that inclines the connecting surface of the rubber bush 2 at an angle larger than a right angle with respect to the case surface 1A. An opening is provided on the inclined surface 5A, and the rubber bush 2 is passed through and connected to the opening. Furthermore, the rubber bush 2 connected to the opening of the inclined surface 5A bends the case outer portion 2A protruding outside the case 1 in a direction along the surface of the case 1. A lead wire 3 is inserted into a rubber bush 2 formed by bending the outer portion 2A of the case, and the lead wire 3 is drawn out in a direction along the case surface 1A.
[0009]
In the lead wire take-out structure described in claim 2 of the present invention, the inclined surface 5A is inclined at about 135 degrees with respect to the case surface 1A. The case outer portion 2A of the rubber bush 2 is also bent at about 135 degrees, and the lead wire 3 is taken out in parallel with the case surface 1A.
[0010]
Furthermore, in the lead wire take-out structure according to claim 3 of the present invention, the planar shape of the protrusion 5 provided in the case 1 is a substantially right triangle. The protrusion 5 has a surface along the inclined surface of a right triangle as an inclined surface 5A, and connects the rubber bush 2 thereto.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify the lead wire take-out structure for embodying the technical idea of the present invention, and the present invention does not specify the lead wire take-out structure as follows.
[0012]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the examples are referred to as “the scope of claims” and “the means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0013]
The lead wire take-out structure of the present invention is used in electronic devices such as a CD player, a DVD player, a tape recorder, an MD player, and a charger. The lead wire connected to the case is mainly a power cord. However, the lead wire take-out structure of the present invention does not specify the lead wire as a power cord. The lead wire can be any lead wire taken out from the case.
[0014]
In the lead wire take-out structure shown in FIGS. 3 to 7, the rubber bush 2 is attached so as to penetrate the case 1. The rubber bush 2 inserts the lead wire 3 and connects the lead wire 3 to the case 1. The rubber bush 2 is manufactured by molding with soft plastic, natural rubber or synthetic rubber. The rubber bush 2 is provided with a central hole through which the lead wire 3 can be inserted without a gap at the center, and the lead wire 3 is inserted through the central hole. After the rubber bush 2 is molded into a predetermined shape, the lead wire 3 is inserted into and connected to the center hole. The rubber bush 2 can be fixed by inserting a lead wire 3 when molding. The rubber bush 2 in which the lead wire 3 is inserted and fixed has a feature that the lead wire 3 can be held more reliably. In the case where the lead wire 3 is inserted into the molded rubber bush 2, the rubber bush 2 and the lead wire 3 can be connected by bonding the lead wire 3 to the center hole of the rubber bush 2.
[0015]
The rubber bush 2 is provided with a fitting groove 4 that is fitted into the opening of the case 1 at a portion that penetrates the case 1. The rubber bush 2 is attached to the case 1 so that the inner edge of the opening of the case 1 is fitted into the fitting groove 4 so as not to come off. The rubber bush 2 protrudes shortly from the fitting groove 4 to the inside of the case 1. Further, the rubber bush 2 protrudes from the fitting groove 4 to the outer side of the case 1 as a case outer portion 2A longer than the inner side. The case outer portion 2A can be gradually and flexibly deformed toward the tip.
[0016]
The case outer portion 2A is formed into a shape that bends in the vicinity of the case 1, and the lead wire 3 is drawn out in parallel with the case surface 1A. The rubber bush 2 shown in the figure is shaped to be bent at about 135 degrees, and the lead wire 3 is drawn out in a direction parallel to the case surface 1A. The angle α at which the case outer portion 2A of the rubber bush 2 is bent varies depending on the inclination angle β of the inclined surface 5A on which the rubber bush 2 is attached to the case 1. This is because the lead wire 3 is always taken out in parallel with the case surface 1A.
[0017]
As the angle β of the inclined surface 5A on which the rubber bush 2 is mounted approaches 135 degrees to 90 degrees, the bending angle α of the outer portion 2A of the case increases, and the angle β of the inclined surface 5A increases from 135 degrees to 180 degrees. As the angle approaches, the bending angle α is decreased. The angle β of the inclined surface 5A on which the rubber bushing 2 is mounted with respect to the case surface 1A is preferably 135 ° + 30 ° to 135 ° −30 ° centering on 135 °, so the bending angle α of the case outer portion 2A is also From 135 degrees to 30 degrees to 135 degrees +30 degrees.
[0018]
The rubber bush 2 is formed thick or hard so as to hardly deform the bent portion, and is formed so as to be gradually and flexibly deformed toward the tip rather than the bent portion. The rubber bush 2 can be molded more thinly or can be deformed more flexibly by providing a parallel slit 6 in parallel.
[0019]
The case 1 is provided with a protruding portion 5 at a portion where the rubber bush 2 is connected. The protruding portion 5 is an inclined surface 5A that inclines the connecting surface of the rubber bush 2 at an angle larger than a right angle with respect to the case surface 1A. In the case 1 shown in the figure, the inclined surface 5A is inclined at about 135 degrees with respect to the case surface 1A. The inclined surface 5A is provided with an opening through which the rubber bush 2 passes. The opening is opened to a size that fits into the fitting groove 4 of the rubber bush 2.
[0020]
In the case 1 shown in the figure, the planar shape of the protruding portion 5 is a substantially right triangle, and the surface along the inclined surface of the right triangle is an inclined surface 5A. Further, the case 1 shown in the figure has a protrusion 5 at one corner, and the lead wire 3 is drawn out toward the center of the case 1. The lead wire take-out structure with this structure has an advantage that the lead wire 3 is protected by the case 1 and disconnection can be more effectively prevented.
[0021]
The lead wire 3 connected to the projecting portion 5 of the case 1 via the rubber bush 2 is bent about 135 degrees inside the projecting portion 5 or gently curved, and is incorporated in the case 1. It is directly connected to a printed circuit board by soldering or connected via a connector.
[0022]
【The invention's effect】
The lead wire take-out structure of the present invention has an advantage that the lead wire can be taken out in parallel to the case surface without applying an excessive force to the portion connecting the lead wire to the case. That is, the lead wire take-out structure of the present invention is provided with a protruding portion at a portion connecting the rubber bush of the case, and an inclined surface for inclining the connecting surface of the rubber bush at an angle larger than a right angle with respect to the case surface. This is because the outer part of the case that protrudes outside the case of the rubber bush is bent in a direction along the surface of the case. In this take-out structure, the lead wire pulled out from the case is bent at a large angle both at the connecting portion with the case and at the outside of the case of the rubber bush. In other words, there is a feature that it can be taken out in parallel to the case surface without applying an excessive force to the lead wire. Thus, the lead wire to which an excessive force does not act is effectively prevented from being disconnected at the connecting portion between the lead wire and the case. Therefore, the lead wire take-out structure of the present invention has an advantage that the electronic device can be used for a long period of time by reducing the failure of the electronic device due to the disconnection of the lead wire.
[0023]
Furthermore, the lead wire take-out structure of the present invention does not need to enlarge the protruding portion because the lead wire is not bent at a right angle with a small radius of curvature inside the protruding portion as in the prior art. For this reason, the feature which can make the part which connects a rubber bush compact is also provided.
[Brief description of the drawings]
1 is a bottom view showing a conventional lead wire take-out structure. FIG. 2 is a perspective view of a lead wire take-out structure shown in FIG. 1. FIG. 3 is a bottom view showing a lead wire take-out structure of the present invention. 3 is a plan view of the lead wire take-out structure shown in FIG. 3. FIG. 5 is a rear view of the lead wire take-out structure shown in FIG. 3. FIG. 6 is a side view of the lead wire take-out structure shown in FIG. FIG. 3 is a perspective view of the lead wire take-out structure shown in FIG.
DESCRIPTION OF SYMBOLS 1 ... Case 1A ... Case surface 2 ... Rubber bush 2A ... Case outer part 3 ... Lead wire 4 ... Insertion groove 5 ... Projection part 5A ... Inclined surface 6 ... Horizontal slit

Claims (3)

The rubber bush (2) is connected through the case (1), the lead wire (3) is inserted through the rubber bush (2), and the lead wire (3) is inserted through the rubber bush (2). In the lead wire extraction structure connected to (1),
The case (1) has a protrusion (5) at the part where the rubber bush (2) is connected, and this protrusion (5) connects the connecting surface of the rubber bush (2) to the case surface (1A). It is an inclined surface (5A) that is inclined to a larger angle than a right angle to the rubber bush (2) through an opening provided in the inclined surface (5A),
Furthermore, the rubber bush (2) connected to the opening provided on the inclined surface (5A) has a case outer portion (2A) protruding outside the case (1) in a direction along the surface of the case (1). It ’s bent,
A lead wire take-out structure, wherein a lead wire (3) is inserted into the rubber bush (2), and the lead wire (3) is drawn out in a direction along the case surface (1A). The inclined surface (5A) is inclined at about 135 degrees with respect to the case surface (1A), and the case outer portion (2A) of the rubber bush (2) is bent at about 135 degrees. Lead wire take-out structure. The lead wire take-out structure according to claim 2, wherein the planar shape of the projecting portion (5) is a substantially right triangle, and the surface along the inclined surface of the right triangle is an inclined surface (5A).

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