JPH1079583A - Electrical cord holding structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable an electric cord to be held at a predetermined position in a case simply by assembling upper and lower cases, and to be connected to an electric cord and a circuit even when an external force is applied to a lead end of the electric cord. Provided is an electric cord holding structure capable of protecting an electric connection portion with a substrate. SOLUTION: A case composed of an upper case 1 and a lower case 2, a circuit board 3 housed in the case, a connection portion 6 for electrically connecting one end 5A of an electric cord 5 to the circuit board 3, and A drawer end 5B is provided so that the other end of the cord 5 can be drawn out of the case. Upper case 1
Further, the lower case 2 is provided with a protruding portion 8 which is located between the connection portion 6 of the electric cord 5 and the drawing end portion 5B and which is alternately arranged in the drawing direction of the electric cord 5 so as to face each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a circuit board is housed in a case and an electric cord electrically connected to the circuit board is led out of the case. is there.

[0002]

2. Description of the Related Art As a conventional structure in which a circuit board is housed in a case and an electric cord electrically connected to the circuit board is led out of the case, there is a structure as shown in FIG. And a lower case B are provided, and the circuit board C is fixed to one of the cases A by, for example, screws.
The circuit board C is covered by the other case B with the circuit board C facing inward, and the circuit board C is stored in the case. One end D1 of the electric cord D is electrically connected to the circuit board C by means such as soldering, and the other end D2 of the electric cord D is connected to an opening E formed in the lower case B.
The other end D2 of the electric cord D is provided with a connector (not shown) or the like, and is provided so as to be connectable to other electric connection means.

[0003]

However, in the conventional structure, when the electric cord D is assembled with other electric connecting means, or when the electric cord D is vibrated in an assembled state, which is a used state, the case is not used. When an external force, particularly a tensile force, is applied to the other end D2 of the electric cord D drawn out of the electric cord D, a force is applied to a soldered portion to the circuit board C on the one end D1 side of the electric cord D. In addition, there is a possibility that a current-carrying failure may occur due to peeling of the soldered portion or disconnection.

Therefore, as a means for solving this problem,
For example, a detour member such as a rib or a pin is protruded inside the case in a range from an electrical connection point with the circuit board to a position just before being pulled out of the case, and the electric cord is meandered with respect to the detour member. By adopting a configuration in which the cable is pulled out, arranged, wound, and drawn out, and then guided out of the case, even if an external force is applied to the drawn end of the electric cord, the external force is meandered by this electric cord. In some cases, a force is applied directly to the soldered portion, which is an electrical connection portion with the circuit board, by receiving the portion or the winding portion.

[0005] However, this improved structure has a problem in that the operation of winding the electric cord around the pins and ribs formed in the case by winding the electric cord is required, and the assembling is troublesome.

Further, the above-mentioned solution is to solve the problem described above by connecting an electric cord D from a circuit board C and a bottom portion F of a case B provided in parallel with the circuit board C as shown in the conventional example of FIG. In the configuration in which the case B and the electric cord D are wrapped in parallel in the direction in which the electric cord D is pulled out, pins and ribs cannot be formed. There was a disadvantage that it could not be done.

It is also conceivable to provide a separate cord clamp member (not shown) inside the case to fix and support the cord. However, there is a problem that the number of parts increases and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and by simply assembling the upper and lower cases, it is possible to hold the electric cord in a predetermined position in the case, and to draw out the end of the electric cord. It is an object of the present invention to provide an electric cord holding structure capable of protecting an electric connection portion between an electric cord and a circuit board even when an external force is applied to the electric cord.

[0009]

SUMMARY OF THE INVENTION The present invention provides a case including an upper case and a lower case, a circuit board housed in the case, and a connecting portion for electrically connecting one end of an electric cord to the circuit board. A drawer end provided so that the other end of the electric cord can be drawn out of the case, and the upper case and the lower case are located between the connection portion of the electric cord and the drawer end. And, a protruding portion is provided which is alternately arranged in the drawing direction of the electric cord so as to face each other.

Further, a recess is provided at the center of the protruding portion.

[0011] Further, the protruding portion of one case is provided in contact with an inner wall of the other case.

Further, a hole is provided in the circuit board, and the protruding portion is provided facing the hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a structure in which a circuit board is housed in a case consisting of an upper case and a lower case, and an electric cord electrically connected to the circuit board is led out of the case, the circuit housed inside the case is provided. The board is provided with a connection portion at which one end of the electric cord is electrically connected, and the other end of the electric cord is provided as a lead end. The upper case and the lower case are located between the connection part of the electric cord and the end of the drawer, and the positions of the upper case and the lower case are alternately changed in the direction in which the electric cord is drawn. Protrusions arranged opposite to each other are provided. Since the electric cord is assembled with the upper case and the lower case, the upper case and the lower case are alternately displaced at different positions, and are held in a meandering manner by the protruding portions arranged to face each other. Even if a pulling force is applied to the lead end of the electric cord after assembling the case, this force is received by the protruding portion contacting the electric cord, so that a large force can be prevented from being applied to the connection part of the circuit board. Further, the electric cords supported by the protruding portions by the concave portions provided at the central portions of the protruding portions are guided and fixed to the central portions of the protruding portions. The electric cord can be held in a predetermined position in the case.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a first embodiment of the present invention, in which an upper case 1 and a lower case 2 are provided, and a circuit board 3 is fixed to the lower case 2 by screws 4. .

One end 5A of the electric cord 5 is connected to the circuit board 3
The connection part 6 connected by soldering is formed on the electric cord 5.
Is formed as a drawer end 5B, and this drawer end 5B is provided to the outside through a drawer hole 7 formed by cutting out an abutting edge portion between the upper case 1 and the lower case 2. Has been inserted. The circuit board 3 is attached to the lower case 2 in this manner, and is accommodated in the case by closing the upper and lower cases 1 and 2.

According to the present invention, the connection portion 6 in which the one end 5A of the electric cord 5 is connected to the circuit board 3 housed in the case by soldering, and the drawing end portion 5B A protruding portion 8 protruding from one case toward the other case is provided on the inner walls of the upper case 1 and the lower case 2 located between them.

The protruding portions 8 are opposed to each other so that the positions of the upper case 1 and the lower case 2 are alternately changed in the drawing direction of the electric cord 5 drawn out of the connecting portion 6 toward the outside of the case. The upper case 1 and the lower case 2 are assembled by mounting the electric cord 5 between the opposed protruding portions 8 to hold the electric cord 5 in a meandering manner. It is. Then, the drawn end 5B of the electric cord 5 is drawn out to the outside from a drawn hole 7 provided at the end edge where the upper case 1 and the lower case 2 meet.

Thus, the electric cord 5 is simply connected to the upper case 1
By assembling the lower case 2 with the upper case 1 and the lower case 2, the protrusions 8 are arranged so as to face each other alternately at different positions, so that the upper case 1 and the lower case 2 meander between the connecting portion 6 and the drawing end 5 </ b> B. As a result, the electric cord 5 can be fixedly supported without any troublesome work. Then, for example, when assembling the electric cord 5 with other electric connecting means, or by vibration or the like in an assembling state which is a used state, the electric cord 5 is pulled out of the case with respect to a drawn end portion 5B of the electric cord 5. Even if external force, especially tensile force, is applied,
That is, the projecting portions 8 provided on the upper case 1 and the lower case 2
The electric cord 5 can be held in a retaining state by receiving an external force by a portion of the electric cord 5 that comes into contact with the wire, and the force applied to the soldered portion of the electric cord 5 to the circuit board 3 which is the connection portion 6 is reduced. It is possible to solve problems such as poor current conduction in the soldered portion.

In the first embodiment, two projecting portions 81 are formed on the inner wall of the upper case 1 at a predetermined interval, and the two projecting portions 81 of the upper case 1 are formed on the inner wall of the lower case 2. The upper case 1 and the lower case 2 are assembled with each other, and the electric cord 5 is provided with two projecting portions 81 of the upper case 1. The central portion is a cylindrical portion 8 of the lower case 2 as a fulcrum.
2 and are supported at three points by the protruding portions 81, 82, 81, and effectively prevent movement of the electric cord 5 against a pulling force in a direction in which the electric cord is pulled out.
Can be kept in the retaining state.

In this embodiment, as shown in FIG. 2, an arc-shaped concave portion 9 is formed at the tip of a protruding portion 8 for supporting the electric cord 5, so that the electric cord 5 is connected to the protruding portion. It is configured to be guided and held at the center of the tip of the tip 8 so as to be prevented from coming off from the projection 8 to the side. By doing so, it is possible to hold the electric cord 5 in a predetermined position in the case, and it is possible to prevent contact with other electronic components or the like stored in the case.

FIGS. 3 and 4 show a second embodiment of the present invention, in which a concave portion 9 is formed in which a central portion of a tip of a protruding portion 8 for supporting an electric cord 5 is cut out in a square shape. At the same time, the tip of the protruding portion 8 is provided in contact with the inner wall of the other case.

By doing so, in addition to the effect of the first embodiment described above, the electric cord 5 is prevented from being shifted laterally from the protruding portion 8 by the rising wall portions 9A provided on both sides of the concave portion 9. In addition, between the protruding portion 8 surrounded by the rising wall portion 9A of the protruding portion 9 which abuts on the inner wall of the other case and the case, the positioning is well maintained in the vertical direction by preventing displacement. Is what is done. At this time, the projecting portion 8 abutting on the inner wall of the case also has an effect of preventing the case from being deformed inward by the external force.

In this case, the projecting portion 8 is usually arranged without contacting the inner wall of the case, and the projecting portion 8 comes into contact with the inner wall of the case only when the case is greatly deformed inward beyond a predetermined amount. To prevent large deformation of the case.

FIGS. 5 and 6 show a third embodiment of the present invention. A hole 10 is provided in the circuit board 3, and a protruding portion 8 is provided facing the hole 10 so as to face the hole. The protruding portion 8 presses the electric cord 5 so as to fix and support the electric cord 5 in a meandering state in the hole 10 of the circuit board 3. Case 2
Is formed by being drawn out to the outside through a draw-out hole 7 provided in the hole.

By doing so, even when the drawer hole 7 of the lower case 2 for pulling out and guiding the electric cord 5 is provided so as to wrap around the circuit board 3, the hole provided in the circuit board 3 is provided. The electric cord 5 can be retained and held by the projecting portions 8 provided on the upper and lower cases 1 and 2 in the inside 10, and the gap between the hole 10 and the projecting portion 8 is defined by the diameter of the electric cord 5. By setting it smaller, the electric cord 5 can be prevented from coming off from the protruding part 8 to the side part.

Further, in this embodiment, the electric cord 5 is guided and held at the center of the tip of the projection 9 by forming a recess 9 in which the center of the tip of the projection 8 is cut out in a triangular shape. Thus, it is configured to be able to prevent the protrusion 8 from coming off from the side portion.

In the above-described embodiment, the connection of the connection portion 6, that is, the electric cord 5 to the circuit board 3 is performed by soldering. Connection means may be used.

Further, in the above-described embodiment, the structure for storing the circuit board 3 including the upper case 1 and the lower case 2 is used. However, a middle case is provided between the upper case and the lower case.
The circuit board may be housed between the middle case and the upper case or between the middle case and the lower case, and the protrusion may be provided in the middle case and the upper case or the middle case and the lower case. May be configured as an upper case or a lower case.

The shape and number of the protruding portions 8 may be appropriately selected.

[0030]

As described above, according to the present invention, it is possible to hold the electric cord at a predetermined position in the case only by assembling the upper and lower cases, and it is assumed that an external force is applied to the drawn end of the electric cord. Also, it is possible to provide an electric cord holding structure capable of protecting an electric connection portion between the electric cord and the circuit board.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the first embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a view showing an AA cross section in FIG. 3;

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is a perspective view showing a main part of a third embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Circuit board 5 Electric cord 5A One end side 5B Pull-out end part 6 Connection part 8 Projection part 9 Concave part 10 Hole part

Claims (4)

[Claims] 1. A case comprising an upper case and a lower case, a circuit board housed in the case, a connection part for electrically connecting one end of the electric cord to the circuit board, and the other end of the electric cord. A drawer end provided so as to be able to be drawn out of the case, and the upper case and the lower case are located between the connection portion of the electric cord and the drawer end, and a pulling direction of the electric cord is provided. 3. An electric cord holding structure, characterized in that a protruding portion is provided which is alternately arranged at a different position. 2. The electric cord holding structure according to claim 1, wherein a concave portion is provided at a central portion of said projecting portion. 3. The case according to claim 2, wherein said projecting portion of one case is provided in contact with an inner wall of the other case.
The electrical cord holding structure described in the above. 4. A holding structure for an electric cord according to claim 1, wherein a hole is provided in said circuit board, and said projecting portion is provided facing said hole.