JP2010165889A - Waterproof structure for casing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide waterproof structure for a casing capable of carrying out easily assembling work, and further free from a risk of impairing a waterproof function. <P>SOLUTION: This waterproof structure for the casing is constituted of a case body 3, and a lid for covering a member storage space of the case body 3, a rib 1a of plate-like cross-sectional shape is erected loop-likely in the periphery of the lid 1, a packing member 2 for covering a bottom face of the lid 1 and the rib 1a is formed into a shape erected with a U-shaped part 2a in a peripheral edge of the plate-shaped part, a waterproof rib 2b is protruded loop-likely in an outer circumference of the U-shaped part 2a, the lid 1 is engaged with the case body 3, by engaging the U-shaped part 2a of the packing member 2 with the rib 1a of plate-like cross-sectional shape of the lid, to bring the packing member 2 into close contact with the lid 1, and the waterproof rib 2b is brought into pressure contact with an inner wall face of the case body 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a waterproof structure for a housing for storing a printed circuit board and the like.

  An example of a waterproof structure of a conventional housing will be described with reference to FIGS. The case main body 6 and the lid 5 shown in FIGS. 8 and 9 are combined to form a housing that defines a sealed space for accommodating a printed circuit board and the like. The case main body 6 and the lid 5 are fastened with screws (not shown) with an O-ring 7 interposed between them in order to provide a waterproof function.

  The O-ring 7 is arranged so as to wind a rib 5a erected around the edge of the lid 5, and as shown in FIG. 9, the inner wall surface 6a of the case body 6 abutted against the lid 5 has a waterproof function. For pressure contact. In addition, the O-ring 7 and the rib 5a of the lid 5 are also designed to be pressed to provide a waterproof function. That is, the inner diameter of the O-ring is naturally smaller than the outer diameter of the rib 5a.

  In the above-described conventional waterproof structure of the casing, the inner diameter of the O-ring 7 is smaller than the outer diameter of the rib 5a of the lid 5, so that the O-ring 7 is expanded outwardly as shown by the arrow in FIG. It is fitted at the position indicated by the diagonal lines. Thus, the assembly process for mounting the O-ring 7 on the lid 5 while being elastically deformed is not workable and increases the number of assembly steps.

  Further, since the posture of the string-like O-ring is not restricted at each position in the longitudinal direction, when the case main body 6 is fitted to the lid 5, the corner of the inner wall surface 6 a of the case main body 6 contacts the O-ring 7. When the O-ring 7 is squeezed into contact, the O-ring is spread and sandwiched between the joints of the case body 6 and the lid 5 as shown by dotted circles in FIG. 11, and the O-ring is damaged and the waterproof function is impaired. There was a fear.

  As shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2003-258450, the sealing structure of the housing disclosed in Japanese Patent Application Laid-Open No. 2003-258450 is provided with a wall 21 at the edge of the opening of the case 11, A rubber packing 23 is attached to the wall portion 21.

  The packing 23 has a substantially U-shaped cross section, and the packing 23 is fitted to the wall portion 21 so that the groove of the packing portion 23 is embedded in the wall portion 21. An outer convex portion 27 protruding in the direction is provided, and the outer convex portion 27 is formed in an annular shape so as to go around the outer peripheral surface of the packing 23.

  When the cover 15 is fastened to the case 11 to which the packing 23 is attached, the inner surface 29 a of the outer wall 29 provided around the cover 15 is in a state of pressing the outer convex portion 27 of the packing 23. The seam is waterproofed.

  In the case sealing structure disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2003-258450, the assembling process for attaching the string-like packing 23 to the wall portion 21 of the case 11 is poor in workability and increases the number of assembling steps.

  Further, since the posture of the string-like packing 23 is not regulated at each position in the longitudinal direction, when the cover 15 is fitted to the case 11 and the frictional force between the cover 15 and the string-like packing 23 is large, the packing 23 May be pulled and deformed by the inner side surface 29a of the cover 15, so that the mounting posture of the packing 23 on the wall portion 21 of the case 11 may deviate from the normal position and the waterproof function may be impaired.

JP 2003-258450 A, paragraphs 0021 to 0027, FIGS. 1 and 2

  The present invention has been made in view of the above points, and an object of the present invention is to provide a waterproof structure for a housing that can be easily assembled and that does not impair the waterproof function. .

  The waterproof structure of the housing according to the present invention is a waterproof structure of a housing composed of a case main body and a lid that covers a member housing space of the case main body, and a rib having a cross-sectional plate shape is formed in a loop shape around the lid. The packing member covering the bottom surface and the rib of the lid is formed in a shape in which a U-shaped portion rises at the periphery of the plate-shaped portion, and a waterproof rib is provided in a loop shape on the outer periphery of the U-shaped portion, The U-shaped portion of the packing member was fitted to the rib of the cross-sectional plate shape of the lid, the packing member was brought into close contact with the lid, the lid was fitted to the case body, and the waterproof rib was pressed against the inner wall surface of the case body Is.

  Further, in the waterproof structure of the housing, an inclined surface is formed which serves as a positioning guide when the lid is fitted to the case body at the corner of the outer end of the U-shaped portion of the elastomer member.

  Further, in the waterproof structure of each case, the upper and lower mold parting lines for molding the packing member are set at the distal end position of the waterproof rib, and the waterproof rib is inclined when the lid is fitted to the case body. The waterproof rib parting line is configured to be separated from the inner wall surface of the case body.

  Further, in the waterproof structure of the housing constituted by the case main body and a lid covering the member housing space of the case main body, a rib having a cross-sectional plate shape is erected in a loop shape around the lid, and the bottom surface of the lid And a packing member that covers the rib is formed so that a U-shaped portion rises at the periphery of the plate-shaped portion, and a waterproof rib is provided in a loop shape on the outer periphery of the U-shaped portion so that the cross-sectional plate-shaped rib of the lid The packing member using an elastomer with the U-shaped portion of the packing member covered on the rib of the lid is formed integrally with the lid by two-color molding.

  Further, the waterproof structure of the casing of the present invention is a waterproof structure of a casing composed of a case main body and a lid that covers a member accommodating space of the case main body, and a rib having a cross-sectional plate shape is looped around the lid The packing member that covers the rib of the lid is formed in a two-color shape with the lid using an elastomer as a structure in which a waterproof rib is projected in a loop shape on the outer periphery of the loop-shaped portion having a U-shaped cross section. And the lid is fitted to the case main body, and the waterproof rib is pressed against the inner wall surface of the case main body.

  According to the waterproof structure of the housing of the present invention, the assembling work can be easily performed and the waterproof function is not impaired.

It is a perspective view which shows a part of member which comprises the waterproof structure of the housing | casing which is Example 1 of this invention. It is AA sectional drawing in FIG. It is a fragmentary sectional view which shows the waterproof structure of the housing | casing. It is a fragmentary sectional view which shows a part of member which comprises the waterproof structure of the housing | casing. It is sectional drawing which shows the member which comprises the waterproof structure of the housing | casing which is Example 2 of this invention. It is sectional drawing which shows the member which comprises the waterproof structure of the housing | casing which is Example 3 of this invention. It is a fragmentary sectional view of the member which shows the modification of the Example of this invention. It is a perspective view which shows the example of the waterproof structure of the conventional housing | casing. It is AA sectional drawing in FIG. It is a perspective view for demonstrating the assembly state of the waterproof structure of the housing | casing. It is sectional drawing which shows the example of the assembly state of the waterproof structure of the housing | casing.

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

  1 is a perspective view showing a state in which a packing member 2 is fitted to a lid 1 having a waterproof structure of a casing according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. As shown in FIG. 2, a rib 1a having a cross-sectional plate shape is erected in a loop shape at the edge of the opening of the lid 1, and a packing member 2 is fitted to the rib 1a.

  The packing member 2 is made of a rubber elastic member such as silicon rubber, and a rib 2a is erected in a loop shape on the edge of the bottom surface 2d. The rib 2a has a substantially U-shaped cross section, and a waterproof rib 2b is formed on the outer peripheral surface thereof.

  Further, an inclined surface 2c serving as a positioning guide is formed at the corner on the outer side of the tip of the rib 2a. The packing member 2 is fitted to the lid 1 so that the rib 1a of the lid 1 is inserted into the groove surrounded by the U-shape of the rib 2a.

  As described above, as shown in FIG. 3, the case main body 3 is fitted to the lid 1 with the packing member 2 fitted thereto until the edges come into contact with each other, and is fastened with screws (not shown). The edge of the inner surface of the case body 3 is a stepped surface, and the waterproof rib 2b of the packing member 2 is pressed against the inner wall surface 3a located in the outer direction. Waterproof performance can be obtained by pressure contact between the waterproof rib 2b and the inner wall surface 3a.

  When the case body 3 is aligned with the lid 1, the lid 1 moves in the direction indicated by the downward arrow in FIG. 3 with respect to the case body 3. At this time, the inclined surface 2c of the rib 2a and the waterproof rib 2b are indicated by arrows, respectively. Receives frictional force in the direction. However, since the rib 2a of the packing member 2 is integrated with the bottom surface 2d, the waterproof rib 2b slides against the inner wall surface 3a while being deformed, and the corner of the step of the case body 3 bites into the inclined surface 2c. There is nothing. And rib 2a does not shift from a normal position.

  In FIG. 4, the parting line of the mold of the packing member 2 is indicated by circles. The parting line of the packing member 2 is located at the top of the waterproof rib 2b. As shown in FIG. 3, the top of the waterproof rib 2b does not come into contact with the inner wall surface 3a of the case body 3. Even if it occurs, the waterproof performance is not impaired.

  Since the rib 2a of the packing member 2 is formed integrally with the edge of the plate-like bottom surface 2d, the rib 2a is displaced when the rib 2a is fitted on the rib 1a of the lid 1. It does not occur and is easy to assemble. Further, when the lid 1 is fitted to the case main body, the rib 2a is caught by friction and does not cause a waterproof failure.

  FIG. 5 is a cross-sectional view showing a lid 1 constituting a waterproof structure of a housing that is Embodiment 2 of the present invention. The lid 1 has the same shape as that of the first embodiment, but in this example, a packing member 2 having the same shape as the packing member of the first embodiment is integrally formed with the lid 1 by two-color molding with an elastomer. Yes.

  In this example, the number of parts and the assembly process are reduced. Further, since the packing member 2 is integrated with the lid 1, it is fixed more firmly than that of the first embodiment, and the displacement of the rib 2a is further reliably prevented.

  FIG. 6 is a cross-sectional view showing the lid 1 constituting the waterproof structure of the housing according to the third embodiment of the present invention. The lid 1 has the same shape as that of the first embodiment. In this example, a packing member 4 using an elastomer is integrally formed with the lid 1 by two-color molding so as to cover the inner wall surface of the lid 1 and the rib 1a. . The packing member 4 includes ribs 4a and waterproof ribs 4b similar to the ribs 2a and waterproof ribs 2b of the first embodiment.

  This example has the same effect as that of the first embodiment. Further, since the bottom surface of the packing member 4 is deleted, the material cost is reduced.

  FIG. 7 shows a modification of the packing member of each embodiment. FIG. 7A shows the packing member 2 of the first embodiment. As for this packing member 2, the cross-section of the waterproof rib 2b formed on the rib 2a has a flat plate-shaped tip rounded into a semicircular arc shape. According to this shape, since the tip of the waterproof rib 2b has a large R shape, the waterproof rib 2b easily slides against the inner wall surface 3a of the case main body 3 when the case main body 3 is fitted to the lid 1.

  In the packing member 2A shown in FIG. 7B, the cross section of the waterproof rib 2Ab formed to protrude from the rib 2Aa has a triangular shape. According to this shape, the waterproof rib 2Ab is elastically deformed so that the curvature is substantially constant, so that the deformed state is stabilized.

  In the packing member 2B shown in FIG. 7C, the cross section of the waterproof rib 2Bb protruding from the rib 2Ba has a triangular tip rounded into an arc. According to this shape, the waterproof rib 2Bb is elastically deformed so that the curvature is substantially constant, so that the deformed state is stabilized. Further, when the case body 3 is fitted to the lid 1, the waterproof rib 2b is fixed to the inner wall surface 3a of the case body 3. Against slippery.

  In the packing member 2 </ b> C shown in FIG. 7D, the waterproof rib 2 </ b> Cb formed to protrude from the rib 2 </ b> Ca has a cross-sectional shape in which a triangular shape is formed at the flat end. According to this shape, since the waterproof rib 2Cb contacts the inner wall surface 3a of the case body in a planar shape, the waterproof performance is enhanced.

  The embodiment is configured as described above, but the invention is not limited to this. For example, the names of the lid and the case main body have no special meaning. That is, a recess that constitutes most of the sealed space may be formed on the lid. Even if it is the structure which fits a packing member to the case main body shown in the Example, it is clear that the effect of a structure does not change.

  According to the waterproof structure of the housing of the present invention, the assembling work can be easily performed and the waterproof function is not impaired, and therefore, it is useful for manufacturing a housing that accommodates a member that requires waterproofing.

DESCRIPTION OF SYMBOLS 1 Lid, 1a rib 2 Packing member, 2a rib, 2b Waterproof rib, 2c Inclined surface, 2d Bottom surface 3 Case main body, 3a Inner wall surface 4 Packing member, 4a rib, 4b Waterproof rib 5 Lid, 5a rib 6 Case main body, 6a inside Wall 7 O-ring

Claims (5)

In a waterproof structure of a housing composed of a case main body and a lid that covers a member housing space of the case main body, a rib having a cross-sectional plate shape is erected in a loop shape around the lid, and the bottom surface and the rib of the lid A packing member that covers the plate-shaped portion has a U-shaped portion rising at the periphery of the plate-shaped portion, and a waterproof rib is provided in a loop shape on the outer periphery of the U-shaped portion. A waterproof structure for a housing, wherein the U-shaped portion of the member is fitted so that the packing member is in close contact with the lid, the lid is fitted to the case body, and the waterproof rib is pressed against the inner wall surface of the case body . The waterproof structure for a housing according to claim 1, wherein an inclined surface is formed at a corner outside the tip of the U-shaped portion of the packing member to serve as a positioning guide when the lid is fitted to the case body. The parting line of the upper and lower molds for molding the packing member is set at the tip position of the waterproof rib, and when the lid is fitted to the case main body, the waterproof rib is inclined and the waterproof rib parting line is The waterproof structure of the housing according to claim 1 or 2, wherein the waterproof structure is configured to be separated from the inner wall surface of the main body. The waterproof structure of a housing according to claim 1, wherein the lid and the packing member using an elastomer are integrally formed by two-color molding. In a waterproof structure of a housing composed of a case main body and a lid covering a member housing space of the case main body, a rib having a cross-sectional plate shape is erected around the lid so as to cover the rib of the lid The packing member is formed by integrally forming the sealing member using a two-color molding with a lid as a structure in which a waterproof rib is provided in a loop shape on the outer periphery of a loop shape portion having a U-shaped cross section, and the lid is fitted to the case body. A waterproof structure of the housing, wherein the waterproof rib is pressed against the inner wall surface of the case body.

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