JP4931018B2 - Housing mating structure - Google Patents

Description

  The present invention relates to a housing fitting structure, and more particularly to a fitting structure capable of improving waterproof performance.

As a waterproof structure of the housing, for example, a structure shown in Japanese Patent Application Laid-Open No. 2002-111246 has been proposed. In this waterproof structure, packing is attached to a packing housing groove formed on the outer periphery of the fitting portion of the housing body, and the housing cover is fitted to the fitting portion.
JP 2002-111246 A (see FIGS. 2 and 3)

  However, in the conventional structure, when the housing cover is fitted to the fitting portion of the housing body, the air inside the housing cover is gradually compressed, so that after the housing cover is fitted, The pressurized air is sealed inside the housing cover. For this reason, the housing cover may come off from the packing of the fitting portion of the housing body due to the pressure of the pressurized air inside the housing during use, particularly in a severe environment where heating and cooling are repeated. There is. In such a case, water or other liquid enters the inside of the housing, and the waterproofness (that is, watertightness) as the housing cannot be maintained.

  This invention is made | formed in view of such a conventional situation, and the subject which this invention tends to solve is providing the fitting structure which can improve waterproof performance.

  The fitting structure according to the first aspect of the present invention is a fitting structure for a casing provided with a casing main body and a cylindrical casing cover that is fitted to the casing main body. The housing body has a fitting portion, the front end side portion of the fitting portion has a seal member mounted on the outer periphery thereof, and the rear end side portion of the fitting portion has an engaging protrusion. The housing cover has an opening that is in close contact with the seal member at one end, and the opening has a tongue-like portion that extends from a part of the end surface. When the casing cover is fitted into the fitting portion of the casing body, the tongue-shaped portion elastically deforms when the tongue-shaped portion climbs over the engagement protrusion after overcoming the seal member, and the base of the tongue-shaped portion A gap is formed between the opening of the housing cover and the sealing member in the case, and the opening of the housing cover is in close contact with the sealing member when the tongue-like portion gets over the engaging protrusion. .

  According to the first aspect of the present invention, when the housing cover is gradually put on the fitting portion of the housing body, the tongue-like portion of the housing cover first comes into contact with the seal member on the front end side portion of the fitting portion. Then, it rides over the engagement protrusion on the rear end side portion of the fitting portion. At this time, the tongue-shaped portion is elastically deformed, and a gap is formed between the opening of the housing cover and the seal member at the base of the tongue-shaped portion. Thereby, the air compressed in the space inside the housing cover is discharged to the outside of the housing through this gap. When the casing cover is further covered with the fitting portion of the casing body, the tongue-shaped portion gets over the engaging protrusion, and the opening of the casing cover is in close contact with the seal member. In this way, the fitting of the housing cover to the housing body is completed.

  In this case, before the opening of the housing cover is brought into close contact with the seal member of the fitting portion of the housing body, the housing is utilized by utilizing the elastic deformation of the tongue-like portion on the opening end surface of the housing cover. The compressed air inside the cover is discharged outside the housing, so there is no pressure air remaining inside the housing when the housing cover is fitted to the housing body. It can prevent that the opening part of a housing | casing cover remove | deviates from the sealing member of the fitting part of a housing body inside, and can improve waterproof performance.

  According to a second aspect of the present invention, in the first aspect, the tongue-shaped portion has a protruding piece projecting in the width direction at its tip, and the engaging protrusion of the fitting portion is provided at a position corresponding to the protruding piece. At the same time, when the overhanging piece gets over the engaging protrusion, the housing cover is prevented from coming off due to the engagement between the side edge of the overhanging piece and the engaging protrusion.

  In this case, when the housing cover is fitted to the fitting portion of the housing body, the tongue-shaped portion elastically deforms when the protruding piece at the tip of the tongue-shaped portion rides on the engaging protrusion of the fitting portion. Thus, a gap is formed between the opening of the housing cover at the base of the tongue-like portion and the seal member, and the pressurized air inside the housing cover is discharged outside the housing through this gap. The Further, in this case, the housing cover can be prevented from coming off by the protruding piece getting over the engaging protrusion and the engaging protrusion engaging with the side edge of the protruding piece.

  According to a third aspect of the present invention, in the first or second aspect, in the state in which the housing cover is fitted to the fitting portion of the housing main body, the opening end face of the housing cover and the fitting portion of the housing main body facing this. A gap in the front-rear direction is formed between the two.

  In this case, by inserting a tool such as a flathead screwdriver into the front-rear gap between the opening end surface of the housing cover and the fitting portion of the housing body, the opening end surface of the housing cover is It moves to the side away from the fitting part of a body main body, Thereby, the fitting state of a housing | casing cover can be cancelled | released and a housing | casing cover can be removed easily.

  According to a fourth aspect of the present invention, in the third aspect, the casing main body is mounted with an electronic circuit including a light source, and the casing cover is a translucent member.

  In the invention of claim 4, the surface of the housing cover emits light when the light emitted from the light source is irradiated onto the housing cover. In this case, a tool is inserted when removing the housing cover. The part where the upper surface is bent is the end face of the opening of the housing cover. Therefore, it is possible to prevent the surface of the housing cover serving as the light emitting surface from being damaged.

  As described above, according to the housing fitting structure according to the present invention, before the opening of the housing cover is brought into close contact with the sealing member of the fitting portion of the housing body, the end surface of the opening of the housing cover. The compressed air inside the housing cover can be discharged to the outside of the housing by utilizing the elastic deformation of the tongue-shaped portion, so that pressurized air remains inside the housing when the housing cover is fitted to the housing body. Thus, the opening of the housing cover can be prevented from being detached from the sealing member of the fitting portion of the housing body during use, and the waterproof performance can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 9 are views for explaining a housing fitting structure according to an embodiment of the present invention. FIG. 1 is an exploded view of a light emitting device having a housing with a fitting structure according to this embodiment. FIGS. 2 and 5 are perspective views for explaining how the housing cover is fitted to the housing body, and FIGS. 6 to 8 are for explaining how the housing cover is fitted to the housing body. FIG. 9 is a longitudinal sectional partial view of the tongue-like portion in FIGS. 5 and 8, and is a view for explaining the function and effect of this embodiment. 1 shows a state in which the housing is viewed from the front surface side (light emitting surface side), and the perspective views of FIGS. 2 to 5 and the bottom views of FIGS. 6 to 8 show the housing on the back surface side (light emission). The state seen from the back side of the surface is shown.

  As shown in FIG. 1, the light emitting device 1 includes a housing main body 2 and a cylindrical translucent housing cover 3 that fits into the housing main body 2. The housing body 2 has a fitting portion 20. A groove 21 for mounting an O-ring 4 as a seal member is formed on the outer periphery of the front end side (right end side in the figure) of the fitting portion 20. As shown in FIG. 2, a pair of engagement protrusions 22 are provided on the rear end side (left end side in the figure) of the fitting portion 20 on the back surface side of the housing body 2. A pair of grooves 23 extending in the front-rear direction are formed on the sides of each engagement protrusion 22. Further, a notch 24 is formed in a part of the front end face of the fitting portion 20 with which the housing cover 3 abuts when the housing cover 3 is fitted.

  A lead wire 25 is connected to the fitting portion 20. Inside the housing body 2 are a circuit board 5 including a light emitting diode (not shown) as a light source, a translucent light guide plate 6 irradiated with light emitted from the light emitting diode, and a light guide plate 6. A reflection sheet 7 for reflecting the emitted light and a diffusion sheet 8 for diffusing the light emitted from the light guide plate 6 are mounted. In this case, the light emitted from the light emitting diode is reflected by the reflection sheet 7 and diffused by the diffusion sheet 8, so that the upper surface 3A, the front end surface 3B, and both side surfaces 3C of the housing cover 3 emit light. ing.

  The housing cover 3 has an opening 30 at one end that comes into close contact with the O-ring 4 of the fitting portion 20 when fitted to the housing body 2. The opening 30 has a tongue-like portion 31 extending from the center of the end surface. A pair of projecting pieces 32 projecting in the width direction are formed at the tip of the tongue-shaped portion 31. Each overhang piece 32 is disposed at a position corresponding to each engagement protrusion 22 of the fitting portion 20 of the housing body 2. In addition, a pair of engagement pieces 33 are provided on both sides of the tongue-like portion 31 on the end face of the opening 30 via slits 35. Each engagement piece 33 is disposed at a position corresponding to each groove 23 of the fitting portion 20 of the housing body 2.

  Next, when the housing cover 3 is attached to the housing body 2 configured as described above, the tongue-shaped portion 31 of the housing cover 3 is placed on the back side of the housing body 2 and the housing body 3 is disposed. The housing body 2 is inserted into the opening 30 of the body cover 3 (that is, the housing cover 3 is put on the housing body 2).

  Then, the respective ends of the protruding piece 32 and the engaging piece 33 of the tongue-like portion 31 of the housing cover 3 come into contact with the O-ring 4 mounted in the groove 21 of the fitting portion 20 of the housing body 2 (FIG. 2). reference). When the housing body 2 is further inserted from this state, the overhanging piece 32 and the engaging piece 33 of the housing cover 3 move over the O-ring 4 so that the overhanging piece 32 is in front of the engaging protrusion 22. Further, the engagement piece 33 moves to the front of the groove 23 (see FIGS. 3 and 6).

  When the housing body 2 is further inserted into the opening 30, the overhanging piece 32 rides on the engaging protrusion 22 (see FIGS. 4 and 7), whereby the tongue-like portion 31 is elastically deformed and curved.

  The state of the tongue portion 31 at this time is shown in FIG. As shown in the figure, the overhanging piece 32 rides on the engaging protrusion 22 and the tongue-like portion 31 curves upward, whereby the opening 30 and the O-ring 4 of the housing cover 3 at the base of the tongue-like portion 31 are obtained. A gap c is formed between the two. Then, the air compressed in the internal space of the housing cover 3 by the insertion of the housing body 2 is discharged to the outside of the housing through the gap c (see the arrow in the figure).

  From this state, when the casing cover 3 is further covered with the fitting portion 20 of the casing body 2, the overhanging piece 32 gets over the engaging protrusion 22, and the engaging protrusion 22 moves into the slit 35 to be slit. 35 is engaged with the side edge of the overhanging piece 32 (see FIGS. 5 and 8). Thereby, the housing cover 3 is prevented from coming off. On the other hand, the engagement piece 33 of the housing cover 3 is inserted into the groove 23 of the housing body 2. At this time, the opening 30 of the housing cover 3 is in close contact with the O-ring 4 of the fitting portion 20 of the housing body 2, thereby sealing the opening 30. Further, the end face of the opening 30 of the housing cover 3 is in contact with the front end face of the fitting portion 20 of the housing main body 2, and the notch 24 is formed on the front end face of the housing cover 3. A gap e in the front-rear direction is formed between the end face of the opening. In this way, the fitting of the housing cover 3 to the housing body 2 is completed.

  In this case, the elastic deformation of the tongue-shaped portion 31 on the end face of the opening of the housing cover 3 is performed before the opening 30 of the housing cover 3 is brought into close contact with the O-ring 4 of the fitting portion 20 of the housing body 2. Can be used to discharge compressed air inside the housing cover to the outside of the housing, so that the pressurized air remains inside the housing when the housing cover 3 is fitted to the housing body 2. Thus, it is possible to prevent the opening 30 of the housing cover 3 from being detached from the O-ring 4 of the fitting portion 20 of the housing body 2 during use, thereby improving the waterproof performance.

  Therefore, the housing according to the present embodiment is suitable for using an electronic device outdoors or in an environment where water or other liquid is scattered in a factory, and particularly, heating and cooling are repeated. It is suitable for use in such a harsh environment.

  Next, when the housing cover 3 is removed in the state shown in FIGS. 5 and 8 in which the housing cover 3 has been fitted into the housing body 2, the opening end face of the housing cover 3 and the housing By inserting the tip of a tool such as a flathead screwdriver 100 into the front-rear gap e between the front end face of the fitting portion 20 of the main body 2 and prying it, the opening end face of the case cover 3 is fitted to the case main body 2. It moves to the side away from the front side end surface of the joint part 20, and thereby, the fitting state of the housing cover 3 can be released, and the housing cover 3 can be easily removed.

  According to such a fitting release method, even when the inside of the housing is in a negative pressure state when the housing cover 3 is fitted, the overhanging piece 32 is engaged with the engaging protrusion 22 when the housing cover 3 is moved. When the base plate of the tongue-shaped portion 31 is bent upward, a gap c is formed between the opening 30 of the housing cover 3 and the O-ring 4 at the base of the tongue-like portion 31. Since the negative pressure state is easily released when air outside the housing flows into the internal space, the fitting state of the housing cover 3 can be easily released.

  Further, in this case, since the place where the tool is inserted and removed when removing the housing cover 3 is the opening end surface of the housing cover 3, it is possible to prevent the side surface 3C of the housing cover 3 serving as the light emitting surface from being damaged.

  In the above-described embodiment, the light emitting device has been described as an example of the case that employs the fitting structure according to the present embodiment. However, the application of the present invention is not limited to this. The present invention can also be applied to a case on which various other electronic circuits are mounted.

1 is an exploded view of a light emitting device having a housing employing a fitting structure according to an embodiment of the present invention. It is a perspective view for demonstrating a mode that a housing | casing cover fits a housing main body. It is a perspective view for demonstrating a mode that a housing | casing cover fits a housing main body. It is a perspective view for demonstrating a mode that a housing | casing cover fits a housing main body. It is a perspective view for demonstrating a mode that a housing | casing cover fits a housing main body. (A) is a bottom view for demonstrating a housing cover fitting to a housing main body, (b) is the side view, and is a figure corresponding to FIG. (A) is a bottom view for demonstrating a housing cover fitting to a housing body, (b) is the side view, and is a figure corresponding to FIG. (A) is a bottom view for demonstrating a housing cover fitting to a housing main body, (b) is the side view, Comprising: It is a figure corresponding to FIG. It is a figure for demonstrating the effect of a present Example, Comprising: It corresponds to the longitudinal cross-section fragmentary view of the tongue-shaped part in FIG. 5 and FIG.

Explanation of symbols

2: Case body 20: Fitting portion 22: Engagement protrusion

3: Housing cover 30: Opening 31: Tongue 32: Overhang piece

4: O-ring

e: Clearance

Claims (4)

A housing fitting structure comprising a housing body and a cylindrical housing cover that fits into the housing body,
The housing body has a fitting portion, the front end side portion of the fitting portion has a seal member mounted on the outer periphery thereof, and the rear end side portion of the fitting portion has an engaging protrusion. ,
The housing cover has an opening closely contacting the seal member at one end, and the opening has a tongue-like portion extending from a part of the end surface,
When the housing cover is fitted into the fitting portion of the housing body, the tongue-like portion elastically deforms when the tongue-like portion rides over the engagement protrusion after overcoming the seal member. When a gap is formed between the opening of the housing cover at the base of the tongue-shaped portion and the seal member, and the tongue-shaped portion has climbed over the engaging protrusion, the housing cover The opening of the seal member is in close contact with the seal member.
A housing fitting structure characterized by that. In claim 1,
The tongue-shaped portion has a projecting piece projecting in the width direction at the tip thereof, the engaging projection is provided at a position corresponding to the projecting piece, and the projecting piece gets over the engaging projection. When this occurs, the housing cover is prevented from coming off due to the engagement between the side edge of the overhanging piece and the engaging protrusion.
A housing fitting structure characterized by that. In claim 1 or 2,
In a state where the housing cover is fitted to the fitting portion of the housing main body, there is a front and rear between the opening end surface of the housing cover and the fitting portion of the housing main body facing the opening portion. A gap in the direction is formed,
A housing fitting structure characterized by that. In claim 3,
The housing body is equipped with an electronic circuit including a light source, and the housing cover is a translucent member.
A housing fitting structure characterized by that.

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