JP4852978B2 - Water stop structure of cord bush - Google Patents

Description

  The present invention relates to a water stop structure for a cord bush attached to an electrical or communication-related device.

    Some electrical and communication devices have a water stop structure for attaching a cord or cable. For example, in (Patent Document 1), as shown in FIG. 7, a waterproof chamber 2 is provided in front of the through hole 1 of the case, and a power cord 4 having a bush 3 attached thereto is inserted into the waterproof chamber 2. The water-proof material (here, urethane resin or epoxy resin) 5 is injected into the waterproof chamber 2 through which the bush 3 is inserted.

In this way, water is prevented from entering through the through hole 1 for inserting the power cord 4, thereby avoiding a decrease in waterproofness of the case.
JP 2004-265748 A

  However, this method prevents water from entering through the gap between the bush and the insertion hole of the case, but may not prevent water from entering through the gap between the bush and the connection cord (cable).

  That is, in the cord bush 13 in which the bush 11 is formed integrally with the cord 10 as shown in FIG. 8, when the cord 10 is a parallel cord (cable) composed of a plurality of cords 10, the cord 10 is formed at the time of molding as shown in FIG. The material of the bush 11 does not flow properly in the narrow part where they are in contact with each other (it is considered that the viscosity is high), and the gap 14 is generated. When the cord 10 having the gap 14 between the cord 10 and the bush 11 is attached to the case in this manner, there is a problem that water is allowed to enter the case through the gap 14.

  As a method for solving this problem, as shown in FIG. 9 and FIG. 10, there is a problem that an adhesive must be applied as a water stop material 15 at two locations a and b of the bush 11 in the case.

  At this time, one of the reasons for applying the water-stopping material 15 to the portion b in FIGS. 9 and 10 is that the water-stopping material (adhesive) 15 is filled around the bush 11 and fixed. The bush metal fitting 16 is press-fitted to fix the water so that the cord bush 12 does not move and generate a gap to stop the water, but the water stop material 15 does not go around the bush 11 as shown in FIG. There was a problem that it overflowed and could not be filled enough by backflow. For this reason, it is necessary to check the filling state, but since this part is on the back side of the bush 11, it is difficult to check the filling state during work, and a NG thing is found in a test after filling. There was a problem that took time.

  Accordingly, an object of the present invention is to improve workability by reducing the number of application parts of the water-stopping material, and to improve the water-stopping performance even if the application parts are reduced, and to confirm the application state Is to make it easier.

In order to solve the above-mentioned problems, in the present invention, a bush formed by integrally filling a gap formed between cords or cables with a bush material, a receiving portion having a rounded surface for receiving the bush, and the receiving portion It is composed of a case provided with a portion and a water-stopping material, and adopts a configuration in which a bushing is disposed on the rounded surface of the receiving portion of the case and filled with the water-stopping material .

  By adopting such a configuration, the gap formed between the cords or the cables can prevent the bush material from wrapping around between the cords or the cables in the case of integral molding. Furthermore, for example, if a water-stopping material is applied to the bush portion, the applied water-stopping material wraps around between the cords or cables in which gaps are formed and can cover the whole, so that a high water-stopping effect can be expected.

At this time , a sufficient (around) gap is formed between the bush and the bush, and the gap can be filled with the water-stopping material to prevent backflow of the water-stopping material.

  Moreover, the structure which formed the groove | channel which penetrates a bush in the width direction in the part arrange | positioned in the case of the said bush is employable.

  By adopting such a configuration, it is possible to check the filling state of the water-stopping material through the through-grooves, and thus it is possible to prevent filling failure of the water-stopping material.

  Further, at this time, it is possible to employ a configuration in which the groove of the bush is opposed to the surface of the receiving portion with the rounded shape of the case.

  By adopting such a configuration, if the filling of the water-stopping material to the rounded surface of the receiving portion is performed through the opposing grooves while visually observing, the water-stopping material to the rounded surface Filling failure can be prevented.

  Since it comprised as mentioned above and provided the clearance gap between the cords shape | molded and filled with bush material, generation | occurrence | production of a space | gap can be prevented and the water stop performance of a cord bush can be improved. Moreover, since the water stop material can be filled evenly by preventing the water stop material from flowing back when the cord bush is attached to the case, the water stop ability can be improved. Furthermore, since the water-stopping material filled by providing a groove in the bush can be confirmed, it is possible to prevent the occurrence of defective products due to poor filling. Moreover, since the water stop failure can be prevented, the water stop material can be filled in one place, so that the work efficiency can be improved.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 shows a cord bush 20 of the present application.

  The cord bush 20 is formed by integrally molding a bush 19 on a cord 10 or a cable. As shown in FIGS. 3 and 4, a stopper 21 with a step is provided on the bush 19 portion, and the stopper 21 will be described later. Is attached in contact with the case 24.

  Further, as shown in FIG. 2, the cord bush 20 is formed by integrally forming the bush 19 by forming gaps 22 between the plurality of cords 10, and thus by forming the gaps 22 between the cords 10. At the time of molding, the bush material goes around the gap 22 as shown in FIG. Therefore, it is possible to prevent the gap 22 from being formed between the cords 10 after the molding, so that the water stop performance can be improved as will be described later. In addition, as will be described later, even when the water-stopping material is filled, the water-stopping material 27 wraps around between the cords 10 to cover the entire application portion, for example (for example, between the cord 10 and the bush 19 due to poor molding). The water stop performance can be improved even when a void is formed in the bottom.

  Furthermore, a groove 23 in the width direction is formed in the bush 19 portion of the cord 10. As shown in FIG. 3, the groove 23 is formed in a portion located in an opening 26 of a receiving portion 25 of the case 24 described later when the cord bush 20 is attached to the case 24. It penetrates the bush 19.

  Incidentally, the groove 23 is provided for confirming the filling of the water stop material 27, as will be described later. In addition to this, when the cord bush 20 is integrally molded, ) Can also be used.

  On the other hand, as shown in FIG. 4, a through hole 28 for fitting the bush 19 portion of the cord bush 20 is provided on the back surface of the case 24 (chassis in this embodiment) to which the cord bush 20 is attached. The receiving portion 25 is formed at the tip of the hole 28 to fix the cord bush 20 and stop the water.

  That is, as shown in FIG. 4, the through hole 28 is provided with a step portion 29 so as to be fitted to the bush 19 of the cord bush 20, and the step portion 29 contacts the stopper 21 of the bush 19. And support.

  The receiving portion 25 communicates with the through hole 28 as shown in FIG. 4, and the surface 30 for receiving the bush 19 of the receiving portion 25 is rounded as shown in FIG. Further, the upper side of the rounded surface 30 has a shape opened in the width direction as the opening 26. In the case of this embodiment, the opening 26 is formed at a position where the groove 23 of the bush 19 of the inserted cord bush 20 is matched. Further, the bush fitting 32 is fitted into the opening 26.

  The bush metal fittings 32 are U-shaped metal fittings, and as shown in FIG. Moreover, as shown in FIG. 3, the upper part is provided with the through-hole for screwing as the latching | locking part 33. As shown in FIG. Therefore, if the metal fitting 32 is inserted from the opening 26, the internal bush 19 is sandwiched between the hooks at both ends, and a screw is inserted into the through hole of the locking portion 33 on the metal fitting 32, the cord bush 20 can be fixed. it can.

  This configuration is configured as described above, and the cord bush 20 is formed by integrally forming the bush 19 with the gaps 22 formed in the plurality of cords 10 as shown in FIG. Wraps around between the cords 10 and 10 and does not form voids, so water can be prevented from entering.

  The cord bush 20 having the water stop structure is fitted into the through hole 28 of the case 24. That is, the cord bushing 20 is fitted into the through hole 28 with the side where the stopper 21 is provided on the case side, and is fitted until the stopper 21 of the cord bushing 20 abuts on the step portion 29 of the through hole 28. Then, the groove 23 formed in the bush 19 portion of the cord bush 20 matches the opening 26 of the receiving portion 25 of the case 24. In this state, the opening 26 is filled with a waterproof adhesive (for example, epoxy resin) as a water-stopping material 27. At this time, the water stop material 27 is filled from the outside of the bush 19 of the cord bush 20, for example, as shown in FIG.

  By doing so, the water stop material 27 flows into the inside of the cord bush 20 from the groove 23 and is also filled in the gap 22 formed between the cords 10.

  At this time, the water blocking material 27 filled on the outside is formed into a gap formed between the rounded surface 30 of the receiving portion 25 and the bush 19 of the cord bush 20 by the rounded surface 30. Since it is filled smoothly, no backflow occurs.

  Moreover, since the state of the water-stopping material 27 to be filled can be visually confirmed from above via the groove 23, the water-stopping material 27 can be filled without causing unevenness. Therefore, the water stop material 27 filled without unevenness can exhibit the water stop performance as expected.

  On the other hand, when the outer side of the opening 26 of the water-stopping material 27 is filled, the filling is continued as it is, and the water-stopping material 27 is filled into the communicating groove 23. Thus, when the water stop material 27 is filled, the fitting is completed when the bush fitting 32 is fitted into the opening 26 and engaged with the bush 19 in the opening 26 and screwed to the case 24.

  As described above, the water stopping performance of the main body of the cord bush 20 is improved by forming the member around the cord 10 at the time of molding, and the water stopping material for the lower surface of the bush 19 when fixed to the case 24. Since the water-stopping ability is improved so that the filling of the water-stopper 27 can be performed uniformly and the water-stopping material 27 is filled once, the work efficiency can be dramatically improved.

  The water stop structure of this cord bush can be expected to have a great water stop effect without using any special members and without significant changes in the shape. It can be applied to.

Partially cutaway plan view of an embodiment Sectional view of FIG. The top view which shows the attachment state of embodiment IV-IV sectional view of FIG. Action explanatory diagram of the embodiment Action explanatory diagram of the embodiment Cross section of conventional example Action explanatory diagram of conventional example The top view which shows the attachment state of another prior art example XX sectional view of FIG. Action explanatory diagram of conventional example

Explanation of symbols

19 Bush 20 Cord Bush 23 Groove 24 Case 25 Receiving portion 26 Opening 27 Water-stopping material 30 Surface with a rounded surface

Claims (3)

A bushing (19) in which a bushing material is filled into a cord (10) or a gap (22) formed between cables and molded integrally;
A receiving portion (25) with a rounded surface on the surface for receiving the bush (19);
A case (24) provided with the receiving portion (25) ;
It consists of a water stop material (27),
The water stop structure of the cord bush (20) in which the bush (19) is disposed on the rounded surface of the receiving part (25) of the case (24) and the water stop material (27) is filled . The water stop of the cord bush (20) according to claim 1, wherein a groove (23) in the width direction passing through the bush (19) is formed in a portion of the bush (19) disposed in the case (24). Construction. 3. The cord bush (20) according to claim 2, wherein the groove (23) of the bush (19) is provided on the side of the case (24) facing the rounded receiving portion (25). Water structure.

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