FI126852B - Waterproof construction for an opening part in an appliance housing - Google Patents

Description

Waterproof construction on the opening of the housing

Background of the Invention

Technical field

The present invention relates to a structure for providing a waterproof opening and closing part, such as a connector cover part, a battery holder part or the like in a device housing.

Description of the Prior Art

A compact electronic device, such as a mobile phone, digital camera, or the like, has a structure associated with the connector connector and battery mounting portion for data entry and printing and charging, and a slot cover portion for a device housing for the connector connector or battery mounting member. Further, the gap between the housing opening portion and the above-mentioned lid is conventionally sealed with an o-ring to provide waterproofing.

Figure 26 illustrates the above conventional waterproof construction, with reference numeral 100 denoting the housing of a compact electronic device, reference numeral 101 denoting the opening portion of the housing 100 and reference numeral 200 denoting the lid removably secured to the opening portion 101. 202 is mounted in the mounting groove 201. The O-ring 202 is a rubber-elastic material having a circular cross-section and made waterproof when pressed against the inner groove (inner ring) of the opening portion 101 and the lid 200. 201 between the lower surface with the lid 200 in the opening portion 101 of the housing 100 (see, for example, the patent documents mentioned below).

In the conventional waterproof structure, when the lid 200 is secured to the aperture portion 101 according to Fig. 26 (B) from the position of opening the aperture portion 101 by removing the lid 200 according to Fig. 26 (A), the o-ring 202 with the lower surface of the mounting groove 201, and the risk is that the sealing performance (waterproofness) of the o-ring 202 will deteriorate.

Further, when the o-ring 202 is threaded into the mounting groove 201 of the cover 200, there is a tendency to torque the o-ring 202 and there is a risk that the sealing performance (waterproofing) will deteriorate due to poor installation.

Prior Art Document Patent Document

Patent Document 1: Japanese Unexamined Patent Publication No. 2008-2910102

Patent Document 2: Japanese Non-Examined Patent Publication No. 2007-73269

Summary of the Invention

The present invention has been made in view of the above, and its technical problem is to prevent deterioration of the waterproofing of the seal and poor installation of the seal in the mounting groove due to torsion.

Solutions to the problem

To effectively solve the aforementioned technical problem, the waterproof structure of claim 1 of the present invention is a structure wherein the gasket is mounted in a mounting groove on the outer peripheral surface of the cover and pressed between the inner surface of the opening and the lower surface of the mounting groove. that the seal is flat on the contact surface of the underside of the mounting groove, and the cross-sectional diameter of the seal is made larger than its cross-sectional diameter in height.

Further, the watertight structure of claim 2 of the present invention is a structure wherein the gasket is mounted in a mounting groove on the outer peripheral surface of the cover and is pressed between the inner surface of the opening and the lower surface of the mounting groove by attaching the lid to the opening of the device housing. the lower surface having a circular convex convex surface on the outer peripheral surface of the opposite side and having a D-shape throughout.

Further, the waterproof structure of claim 3 of the present invention is a structure wherein the gasket is mounted in a mounting groove on the outer peripheral surface of the cover and pressed between the inner surface of the opening and the lower surface of the mounting groove. on the underside and that a sealing projection is formed in the sealing groove.

Further, the waterproof structure of claim 4 of the present invention is the waterproof structure of the opening and closure portion of the device casing described in the above-mentioned claim 3, further characterized in that the seal has a flat cross-sectional contact surface, i.e., an inner peripheral flat on its underside, has a circular arcuate convex surface on the outer peripheral surface of the opposite side, and has a D-shape throughout, and a securing projection is formed on the inner peripheral surface of the seal having a D-shaped cross-section.

Further, the watertight structure of claim 5 of the present invention is the watertight structure of the opening and closure portion of the device housing as described in claim 3, further characterized in that the seal has a cross-sectional shape and has a securing projection The sealing projection adheres to the inner surface of the section and has sealing projections on each side in width and has a uniform cross-sectional shape on the underside of the mounting groove.

Further, the watertight structure of claim 6 of the present invention is a structure wherein the gasket is mounted in a mounting groove on the outer peripheral surface of the cover and is pressed between the inner surface of the opening and the lower surface of the mounting groove by attaching the lid to the opening of the housing. the contact surface of the lower surface and the contact surface of the inner surface of the opening portion are made of the tip portion and inclined surfaces on each side thereof.

Further, the watertight structure of claim 7 of the present invention is a structure wherein the seal is mounted in a mounting groove on the outer peripheral surface of the cover and is pressed between the inner surface of the opening and the lower surface of the mounting groove by attaching the lid to the opening of the housing. installation of the groove bottom surface of the contact surface, in other words, the inner peripheral surface so that the installation groove cross-sectional shape is flat on the bottom, and is formed with a tip portion and on both sides of the inclined surfaces of the opposite side of the outer peripheral surface and its cross-sectional shape is completely pentagonal.

Further, the watertight structure of claim 8 of the present invention is the watertight structure of the opening and closure portion of the housing as described in claim 6 or 7, further characterized in that the inclined surface on both sides of the sealing tip and the inclined surface on the opposite side of the lid insertion direction is relatively steep.

Further, the watertight structure of claim 9 of the present invention is the waterproof structure of the opening and closure portion of the housing as described in claim 6 or 7, further characterized in that the inclined surface on each side of the sealing tip and the inclined surface on the opposite side of the lid insertion direction is relatively steep, and the seal end diverges from the central portion in the width direction of the seal toward the opposite side of the lid insertion direction.

In the waterproof structure with the aforementioned structure according to claim 1 of the present invention, since the seal has a uniform shape on the contact surface of the lower surface of the mounting groove and the cross-sectional diameter is even if it is subjected to a load in the direction of rotation, it does not rotate very well, which can effectively prevent waterproofing.

Further, according to claim 2 of the present invention, a waterproof construction, since the seal is a flat cross-section of the groove bottom surface of the contact surface, in other words, the inner peripheral surface so that the installation groove cross-sectional shape of the lower surface flat, as a circular Priva-rib for a convex surface of the opposite side of the outer peripheral surface and the cross section is D-shaped throughout , positioning on the underside of the mounting groove is more stable than a conventional o-ring, which tends to roll, and the seal does not rotate even when subjected to a load in the direction of rotation, thus effectively preventing waterproofing.

Further, in the waterproof structure according to claim 3, 4 or 5 of the present invention, since the mounting bracket formed in the gasket fits into the mounting groove formed on the underside of the mounting groove, the gasket remains within the mounting groove and does not rotate even when subjected to load deterioration of waterproofing. According to the structure of claim 4, since the inner circumferential surface of the seal has a uniform cross-sectional shape, placement on the underside of the mounting groove is stable. According to the structure according to claim 5, since the sealing projections projecting on both sides in the width direction engage the lower surface of the mounting groove, the positioning on the lower surface of the mounting groove is stable. Further, since the axial width of the sealing projections on the outer peripheral side touching the inner surface of the opening portion is made smaller than the axial width of the entire seal, the compression reaction force is smaller when installed.

Further, in the waterproof structure of claim 6 of the present invention, since the seal contact surface with the underside of the mounting groove is flat, positioning on the underside of the mounting groove is more stable than a conventional o-ring which tends to roll, even when loaded in the rotation direction effectively prevent waterproofing. Further, since the contact surface with the inside surface of the housing opening portion is formed by the tip portion and the inclined surfaces on each side thereof, the compression reaction force is smaller compared to the structure where the contact surface with the inside surface of the opening portion is formed by a circular convex surface. compression fitting resistance when the cover is placed in the housing opening, and abrasion of the seal. Thus, it is possible to prevent improper installation of the seal and twisting of the seal within the groove due to repeated opening and closing of the lid or the like, further reducing the compression fitting resistance when the lid is inserted into the housing opening, and preventing waterproofing from abrasion.

Further, in the waterproof structure of claim 7 of the present invention, since the seal has a uniform cross-sectional shape on the lower surface contact surface of the mounting groove, i.e., the inner peripheral surface so that the mounting groove is flat on its lower surface. the seal does not rotate much even when subjected to a load in the direction of rotation, thereby effectively preventing waterproofing. Further, since the seal has a cross-sectional shape with a tip portion and inclined surfaces on both sides with an outer circumferential surface opposite to the inner peripheral surface, and the seal has a pentagonal across, the compression reaction force the stacking margin is fixed, which makes it possible to reduce the compression fitting resistance when the lid is inserted into the opening of the housing, and the friction of the seal. Thus, it is possible to prevent improper installation of the gasket and deformation of the gasket within the groove due to repeated opening and closing of the lid or the like, further reducing the compression fitting resistance when the lid is inserted into the opening of the casing, and preventing deterioration of waterproofing.

Further, in the waterproof structure of claim 8 or 9 of the present invention, the frictional resistance of the seal to the inner surface of the housing opening portion decreases in the direction of inlet of the lid and increases in the opposite direction. Further, as the surface pressure of the seal relative to the inner surface of the housing opening portion increases faster than that of the lid inlet direction than the tip portion, the resistance of the projecting pressure from the outside water increases. Thus, the lid can be more easily fitted to the opening of the housing, the lid may be tightly fitted so that it does not fall from the opening of the housing, and waterproofing can be further improved.

Brief Description of the Drawings

Fig. 1 is a perspective view showing a first embodiment of a waterproof construction of the opening and closing portion of the device housing of the present invention.

Figure 2 shows a situation in which a gasket is mounted in a groove of the first embodiment; Fig. 2 (A) is a front view and Fig. 2 (B) is a side view with part of the seal cut away

Figure 3 shows an example of a seal according to a first embodiment; Figure 3 (A) is a front view and Figure 3 (B) is a cross-sectional view taken along line B-B of Figure 3 (A)

Fig. 4 is a cross-sectional view showing a portion of the seal of Fig. 3 enlarged

Fig. 5 is a cross-sectional view showing an enlarged view of the lid being fitted to the opening of the housing in the first embodiment;

Fig. 6 is an observational view showing the fit of the lid to the opening of the housing in the first embodiment

Fig. 7 is a cross-sectional view of an essential part showing another embodiment of a waterproof structure of the opening and closing part of the device housing of the present invention;

Figure 8 illustrates a situation in which a gasket is mounted in a groove of another embodiment; Fig. 8 (A) is a front view and Fig. 8 (B) is a side view with part of the seal cut away

Figure 9 shows a seal according to a second embodiment; Figure 9 (A) is a front view and Figure 9 (B) is a cross-sectional view taken along line B-B 'of Figure 9 (A)

Fig. 10 is a perspective view of a situation where a seal is mounted in a seal mounting groove in another embodiment

Fig. 11 is a cross-sectional view of an essential part showing a third embodiment of a waterproof structure of the opening and closing part of the device housing of the present invention.

Fig. 12 is a cross-sectional view of the shapes of the cover and seal of the third embodiment

Fig. 13 is a perspective view of a situation where a seal is mounted in a seal mounting groove in a third embodiment

Fig. 14 is a perspective view showing a fourth embodiment of a waterproof structure of the opening and closing portion of the device housing of the present invention.

Figure 15 is a cross-sectional perspective view of a situation where the seal is mounted in a groove in a fourth embodiment

Fig. 16 is an example of a cover on which a gasket is mounted in a fourth embodiment; Figure 16 (A) is a bottom view, Figure 16 (B) is a rear view, and Figure 16 (C) is seen from the side

Fig. 17 shows another example of a cover on which the gasket is mounted, in a fourth embodiment, where Fig. 17 (A) is a bottom view, Fig. 17 (B) is a rear view, and Fig. 17 (C) is a side view

Fig. 18 is a cross-sectional view showing a concrete example of a seal according to a fourth embodiment

Fig. 19 is an exploded view of a process for fitting a lid to an opening portion of a housing according to a fourth embodiment

Fig. 20 is a cross-sectional perspective view of a situation where a seal is mounted in a groove in a fifth embodiment of a waterproof structure of the opening and closing portion of the device housing of the present invention.

Fig. 21 is a cross-sectional view showing an example of a seal according to a fifth embodiment

Figure 22 is an exploded view of a process for fitting a lid to an opening portion of a housing according to a fifth embodiment

Fig. 23 is an observational view of the pin-bearing distribution of the seal of the fifth embodiment

Fig. 24 is a cross-sectional perspective view of a situation where a seal is mounted in a groove in a sixth embodiment of a waterproof structure of the opening and closing portion of the device housing of the present invention.

Fig. 25 is a cross-sectional view showing an example of a seal according to a sixth embodiment

Fig. 26 is an exploded view of a process for fitting a lid to an opening portion of a housing in a waterproof construction of a prior art device opening and closing portion.

Description of Reference Numbers 1 Housing 11 Aperture 2 Cover 21 Inner 22 22 Border 23 Mounting Groove 23a Lower Surface 24 Fastening Groove 3 Seal 3a Inner Perimeter Surface (Contact Area) 3b Outer Perimeter Surface 3c, 3d Side Surface 3e Edge Part 3f, 3g Hinge Part 32 Main Body 34, 35 sealing projection

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the waterproof structure of the opening and closing portion of the device of the present invention will be described below with reference to the accompanying drawings.

First embodiment

First, in the perspective view of Fig. 1, reference numeral 1 denotes the housing of a compact electronic device and reference numeral 2 a lid which is removably attached to the opening 11 in the housing 1.

The opening portion 11 in the housing 1 is constructed as a square with rounded corners. In other words, the periphery of its inner peripheral surface has smooth surface portions and curved surface portions alternately.

The lid 2 has a plate-like shape and has an inner portion 21 which can be inserted into the opening portion 11 of the housing 1 and a rim portion 22 formed to project from the outer end portion of the inner portion 21 and facing the outer surface 1a of the housing 1.

The outer peripheral surface 21a of the inner part 21 of the lid 2 is designed to project in the insertion direction so that it is approximately the same as the opening 11 of the housing 1, i.e. a square with rounded angles as shown in Fig. 2, having circumferentially flat surface and arcuate surface portions smaller than the aperture 11. Further, the outer peripheral surface 21a of the inner member 21 has a mounting groove (also simply called "groove" and "seal mounting groove") 23, and the mounting groove 23 has a substantially C-shaped section, i.e., a flat bottom surface 23a, which is parallel to the outer circumferential surface 21a of the inner member 21 and the two inner faces 23b which rise vertically from each side thereof.

A seal 3 made of a rubber-like elastic material (a rubber material or a synthetic resin material having a rubber elasticity) is mounted in the aforementioned mounting groove 23. The seal 3 is shaped as annular as shown in Figure 3 (A) and has a D-shaped cross section as shown in Figure 3 (B). 4 and 5, the inner peripheral surface 3a engaging the lower surface 23a of the mounting groove 23 has a flat shape and the outer peripheral surface 3b protruding on the outer side of the mounting groove 23 in order to come into contact with the inner surface of the In this case, the inner peripheral surface 3a of the seal 3 corresponds to the contact surface described in claim 1.

Further, as shown in Figure 4, the cross-sectional diameter L1 in the width direction of the seal 3 is larger than the cross-sectional diameter L2 in the height direction, i.e. the ratio L2 / L1 <1. In this case, L2 is greater than the depth of the mounting groove 23.

In the above structure, the lid 2 is made such that its inner part 21 is pressed into the opening 1 11 of the housing 1 via a seal 3 and the seal 3 remains suitably compressed between the lower surface 23a of the mounting slot 23 and the inner peripheral surface 11a of the opening tight and waterproof.

Further according to the present invention, since the inner peripheral surface 3a brought into contact with the lower surface 23a of the mounting groove 23 is smooth and the ratio L2 / L1 <1 is realized, the resistance of the seal 3 is high when the force is directed in the winding direction. Thus, the seal 3 does not rotate due to friction on the inner peripheral surface 11a of the opening portion 11 and on the lower surface 23a of the mounting groove 23 when the cover 2 is fitted to the opening portion 11 according to Fig. 6 (B) and seal 3 provides excellent sealing (waterproofing).

Further, since the gasket 3 is shaped as annular as shown in Fig. 3, the conventional o-ring tends to rotate when it is mounted on the inner part 21 of the non-circular cover 2 with alternating circumferential and curved portions according to Figures 1 and 2. However, in accordance with the present invention, since the cross-sectional shape of the seal 3 is as shown in Figure 4 and thus does not rotate much, it is possible to effectively prevent deterioration of the seal (waterproofness) due to poor installation.

Another embodiment

Next, Figures 7 to 10 show another embodiment of the present invention.

In Fig. 7, reference numeral 1 denotes the housing of a compact electronic device, such as a mobile phone or the like, and reference numeral 2 denotes a cover which is removably attached to an opening 11, which is the inner part of the connector 1 of the housing. The opening portion 11 of the housing 1 is in the shape of a square with rounded corners in its opening shape, i.e., its inner peripheral surface 11a has flat surface portions and curved surface portions alternating in a circumferential direction. The lid 2 has a plate-like shape and has an inner portion 21 which can be inserted into the opening portion 11 of the housing 1 and a rim portion 22 which protrudes outwardly from the outermost end portion of the inner portion 21 and opposes the outer surface 12 of the housing.

The outer peripheral surface 21a of the inner part 21 of the lid 2 has, in its insertion direction, a shape similar to that of the opening 11 of the housing 1, i.e. a square rounded at its corners as shown in Fig. 8, having flat surface and curved surface portions alternately circumferentially part 11. Further, the outer peripheral surface 21a of the inner part 21 of the cover 2 has a mounting groove 23 and the seal 3 is mounted in this mounting 23.

The mounting groove 23 consists of a lower surface 23a having a flat cross-sectional shape parallel to the projection blade 21a of the inner part 21 of the cover 2, and two inner surfaces 23b rising approximately vertically on each side thereof and a securing groove 24 extending parallel to the mounting groove 23. has a C cross-section and is centered in the width direction on the bottom surface 23a.

9 (A) is made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) and consists of a D-shaped main body portion 31 and a securing projection 32 thereof. 9 (B) and 10, respectively.

Specifically, the main body portion 31 of the seal 3 remains in the mounting groove 23, the inner peripheral surface 31a brought into contact with the lower surface 23a of the mounting groove 23 has a smooth cross-sectional outer peripheral surface 31b projecting outwardly in the formed state, there is a convex surface having a circular arcuate cross-section, and there are small gaps with respect to the inner surfaces 23b of the mounting groove 23 so that the main body portion 31 inside the mounting groove 23 is not 100% or even filled; between the inner peripheral surface 11a of the opening 11. Further, the securing projection 32 is made to contact and engage the securing groove 24 formed on the lower surface 23a of the mounting groove 23.

7, the inner part 21 of the lid 2 is press-fitted to the opening 11 of the housing 1 by means of a gasket 3 and the main body 31 of the gasket 3 is suitably compressed by the lower surface 23a of the mounting groove 23 and between the inner peripheral surface 11a of the portion 11, wherein the lid 2 seals the opening portion 11 tightly and watertight.

Further, since the gasket 3 is held in place by the securing projection 32 which is brought into contact and secured to the securing groove 24 formed on the underside 23a of the mounting groove 23, the resistance is high when the force F is applied in the winding direction (rotation direction). Therefore, the seal 3 (main body part 31) does not rotate due to friction on the inner peripheral surface 11a of the opening part 11 and the lower surface 23a of the mounting groove 23 when the cover 2 is fitted to the opening part 11 and ensures excellent sealing (waterproofing).

Further, if the mounting projection 32 is inserted into the lower surface 23a of the mounting groove 23 into the mounting groove 24 while the main body member 31 is lightly pressed when the gasket 3 is mounted on the inner part 21 of the non-circular cover 2 to rotate the mounting groove 23 Thus, the gasket 3 (main body part 31) does not rotate and it is possible to effectively prevent deterioration of the gasket (waterproofing) due to poor installation.

Third Embodiment

Next, Figures 11-13 show a third embodiment of the present invention. This third embodiment differs from the previously described second embodiment in the cross-sectional forms of the fastening groove 24 and the seal 3.

More particularly, the fastening groove 24 formed in the middle of the width direction of the lower surface 23a of the mounting groove 23 has a substantially U-shaped cross-section, as shown in Figures 12 and 13.

Further, the gasket 3 has an inner peripheral side mounting projection 32 having a convex surface and a circular arcuate cross section corresponding to the mounting groove 24, an outer peripheral side sealing projection 33 having a 180 degree symmetrical shape with the securing projection 32, and on each side 11 and 12, i.e., the cross-section of the seal 3 is approximately cross-sectional in shape and is 90 degrees symmetrical with the mounting projection 32 90 degrees in different directions from the mounting projection 32 and the sealing projection 33, respectively.

Further, the sealing projection 32 of the seal 3 is brought into contact with and secured to the lower groove 23a of the mounting groove 23, and the sealing projection 33 on the outer peripheral side protrudes into contact with the inner peripheral surface 11a of the opening 11 of the housing 1. Further, the sealing projections 34 and 35 on each side in width are brought into contact with the inner surfaces 23b and 23b of the mounting groove 23 while remaining in the mounting groove 23, and their inner peripheral parts are brought into contact with the lower surface 23a of the mounting groove 23. Because their surface is convex and of circular cross-section, small gaps are formed with respect to the lower surface 23a of the mounting groove 23 and the inner surfaces 23b, and the filling ratio of the seal 3 in the mounting groove 23 is less than 100%.

In the waterproof structure of the third embodiment described above, shown in Fig. 11, the lid 2 is made by pressing the inner part 21 into the opening 11 of the housing 1 by means of a gasket 3 and the gasket 3 being suitably pinched between the inner peripheral surface 11a of the section 11, whereby the lid seals the opening section 11 tightly and watertight.

Further, since the seal 3 is made by engaging and securing the clamping projection 32 on the inner peripheral side with the clamping groove 24 formed on the lower surface 23a of the mounting groove 23 and the upper ends of the sealing projections 34 and 35 on each side in contact with the inner surfaces 23b and 23b 13 in the winding direction (rotational direction), whereby the seal 3 does not rotate due to friction on the inner peripheral surface 11a of the opening 11 and the lower surface 23a of the mounting groove 23 when the lid 2 is fitted on the opening 11. .

Further, if the securing projection 32 is pressed into the securing groove 24 of the lower surface 23a of the mounting groove 23 while the sealing projections 33-35 are gently pushed when the seal 3 is fitted to the inner portion 21 of the non-circular cover 2 to rotate it into the mounting groove 23. Thus, the torsion of the seal 3 (main body part 31) does not occur and it is possible to effectively prevent the deterioration of the seal (waterproofness) due to poor installation. In this case, the fastening projection 32 of the present invention need not necessarily be continuous in the direction of travel of the seal 3, but may be intermittent. Thus, it is not necessary to attach the mounting projection 32 to the mounting groove 24 over the entire circumference when the seal 3 is mounted and it is possible to prevent air from entering the mounting groove 24.

Fourth embodiment

Next, Figures 14-19 show a fourth embodiment of the present invention. In the perspective view of Fig. 14, reference numeral 1 denotes the housing of a compact electronic device and reference numeral 2 denotes a lid which is removably attached to an opening 11 in the housing for inserting a battery or connecting a cable.

The opening 11 in the housing 1 is made such that the opening shape is, for example, a square shape with rounded corners or an oval shape (not shown) shown in Figure 14. In other words, its inner circumferential surface 11a consists of flat surface portions and curved surface portions alternately in the circumferential direction.

The lid 2 has a plate-like shape and has an inner portion 21 which is disposed in the opening portion 11 of the housing 1 and a rim portion 22 formed to protrude from the outer end portion of the inner portion 21 and facing the outer surface 1a of the housing.

The inner part 21 of the lid 2 is in the insertion direction approximately the same as the opening 11 of the housing 1, for example a square shown in Fig. 16 with rounded corners, an oval shape or the like shown in Fig. 17, i.e. having flat surface and curved surface portions alternately circumferentially 15a also has a peripheral peripheral surface 21a having a peripheral mounting groove 23 and this mounting groove 23 having a substantially C-shaped cross section, i.e. having a flat lower surface 23a parallel to the outer peripheral surface 21a of the interior 21 and two inner surfaces 23b projecting vertically from each side thereof.

A seal 3 made of rubber-elastic material (rubber material or synthetic resin material having rubber-like elasticity) is mounted in the mounting groove 23 of the cover 2.

The gasket 3 is annularly shaped to have a pentagonal cross-section. As shown in Figure 18, the radial height h is greater than the depth d of the mounting groove 23, the inner peripheral surface 3a brought into contact with the underside of the mounting groove 23 is flat and laterally extending The outer surface 23 for coming into contact with the inner surface of the opening portion 11 of the housing 1 in a suitably shaped state comprises a tip portion 3e and inclined surfaces 3f and 3g projecting from the tip portion 3e toward the side surfaces 3c and 3d. The tip portion 3e is centered in the width direction of the seal 3 and the inclined surfaces 3f and 3g on each side of the tip portion 3e have the same gradients. In this case, the inner peripheral surface 3a corresponds to the "contact surface with the lower surface of the mounting groove" as described in claim 6 or 7.

In the concrete example shown in Fig. 18, the gasket 3 is made with a width w of about 1.1 mm and a height h of about 1.0 mm, so that their ratio is h / w <1. Further, the angle formed by each inclined surface 3f and 3g □ is about 74 degrees, the tip portion 3e is bevelled to form a circular surface with a radius of curvature of about 0.3 mm, and the angular portions between the inner peripheral surface 3a and the side surfaces 3c and 3d and the angular portions between the side surfaces 3c and 3d and inclined surfaces 3f and 3g. to produce rounded surfaces with a radius of curvature of about 0.2 mm.

In the aforementioned fourth embodiment, the cover 2 is made by pressing the inner part 21 into the opening part 11 of the housing 1 by means of a gasket 3 and the gasket 3 is suitably clamped between the lower surface 23a of the mounting groove 23 and the inner surface 11a of the opening part 11. watertight.

Further, because the inner peripheral surface 3a brought into contact with the lower surface 23a of the mounting groove 23 has a flat shape, the seal 3 has a high resistance when the force is applied in the roll direction (rotation direction), and the frictional resistance against the inner surface 11a of the opening . Thus, the seal 3 does not rotate when the lid 2 is fitted to the opening 11 as shown in Fig. 19 (B) from the situation where the opening 11 is open as shown in Fig. 19 (A), thereby ensuring excellent sealing (waterproofing) by , since the ratio h / w <1 is realized in the embodiment shown, this effectively affects the torque suppression in the gasket 3.

Further, in this seal 3, the compression reaction force is reduced compared to the D-shaped seal 3, i.e., which has a convex surface in a circular arcuate cross-section with a projection 3b as previously described and described in Figure 4. This is because the seal of the present invention wherein the outer peripheral surface is formed by the tip portion 3e and the inclined surfaces 3f and 3g on each side thereof, the volume of the outer peripheral portion is smaller compared to the seal 3 where the outer peripheral surface forms a circular convex surface as shown in FIG. solid, whereby the amount of compression is reduced compared to the gasket 3 having a D-shaped cross-section if the stacking margin □ is fixed. Thus, the frictional resistance of the seal 3 to the inner surface 11a of the opening portion 11 is reduced and it is possible to reduce the compression fit resistance when the cover 2 is secured to the opening portion 11 as shown in Fig. 19 (B) and the friction of the seal 3.

Further, since the inner peripheral surface 3a brought into contact with the lower surface 23a of the mounting groove 23 is flat, as mentioned above, the seal 3 does not rotate even when it is mounted in the mounting groove 23, thereby effectively preventing deterioration of sealing (waterproofing).

Fifth embodiment

Next, Figs. 20-23 show a Fifth Embodiment of the present invention. This Fifth Embodiment differs from the Fourth Embodiment described above in that the tip portion 3e of the seal 3 deviates from the centerline in the width direction toward the opposite side of the lid insertion direction (side of the lid peripheral portion 22) as shown in Figures 20 and 21. In other words, the distance L3 in the axial direction between the tip portion 3e and the side surface 3c on the lid insertion side is longer than the distance L4 in the axial direction between the tip portion 3e and the side surface 3d on the opposite side of the lid insertion direction on the opposite side of the insertion direction is relatively steep, i.e., the ratio is □ <□ for the inclined surfaces 3f and 3g on each side of the tip portion 3e. The other parts can be made in much the same way as in the fourth embodiment. Therefore, according to the above-mentioned structure, as in the fourth embodiment, it is possible to effectively prevent the torsions of the seal 3 from reducing the friction of the seal 3.

Further, since the frictional resistance of the seal 3 to the inner surface 11a of the opening portion 11 of the housing 1 is reduced by □ <□ in the insertion direction of the cover, the compression fitting resistance is further reduced when the cover 2 is secured to the opening 11 11 is open as shown in Figure 22 (A). Furthermore, since the frictional resistance increases in the opposite direction of the insertion direction of the lid, the lid 2 is unlikely to fall accidentally from the opening 11.

Further, as the tip portion 3e of the seal 3 deviates from the center line in the width direction toward the opposite side of the lid insertion direction, the surface pressure P relative to the inner surface 11a of the opening 11 of the housing 1 is rapidly distributed to the opposite side of the lid insertion direction. As a result, the resistance of water or the like from outside penetration increases and it is possible to further improve water resistance. In this case, since there is a risk of deterioration of the seal and difficulty of easy opening and closing of the lid 2, if the deviation of the tip portion 3e of the seal 3 is too large, the ratio of L3 to L4 may be set to 1: 1-5: 1.

Sixth embodiment

Next, Figures 24 and 25 show a sixth embodiment of the present invention. In this sixth embodiment, the tip portion 3e is centered in the width direction of the seal 3, the slope of the inclined surface 3f □ on the inlet side of the lid is relatively gentle, and the incline on the opposite side of the lid in for surfaces 3f and 3g. Thus, according to the difference between the gradients □ and □, the skirt portion 3h of the inclined surface 3g on the opposite side of the inlet direction of the lid forms a concave surface. The other parts can be made in much the same way as in the fifth embodiment.

Further, according to this construction, as in the fifth embodiment, it is possible to reduce the friction of the seal 3 and to effectively prevent the torsion of the seal 3. Further, the same effect as in the fifth embodiment can be obtained from the ratio □ <□. In other words, the frictional resistance of the seal 3 with respect to the inner surface 11a of the opening portion 11 of the housing 1 decreases in the insertion direction of the lid and increases in the opposite direction. In addition, the surface pressure relative to the inner surface 11a of the housing opening portion 11 is distributed such that it rapidly increases on the opposite side of the inlet direction of the lid, and the resistance of the inlet pressure of water from the outside increases.

Further according to a sixth embodiment, when the width w, the height h, the hinge margin □ and the dimensions of the seal 3 shown in Fig. 25 are the same as the seal 3 shown in Fig. 18 and previously described, the amount of compression (compression reaction force) it is possible to further reduce the compression fitting resistance when the cover 2 is secured to the opening 11 and the friction 3 of the seal 3.

Claims (3)

A watertight structure of the opening and closing portion of the device housing, wherein the seal (3) is mounted in a mounting groove (23) circumferentially on the outer peripheral surface (21a) of the lid interior (21) and this seal (3) is pressed against the inner surface (11a) ) and the lower surface (23a) of the mounting groove (23) by attaching the inner part (21) of the cover (2) to the aperture part (11) of the device housing, the structure 11 is characterized in that the aperture part (11) and the peripheral peripheral surface (21a) of the lid (2) is shaped as a rectangle and the outer peripheral surface (21a) has a flat peripheral surface (21a) and the curved surface portions alternately, the gasket (3) is annularly shaped and the gasket (3) is mounted on a rectangular inner part (21) of the lid (2) to align it with the mounting groove (23), the gasket (3) has a cross-section the flat surface of the mounting groove (23) on the contact surface (3a) of the lower surface (23) and its cross-sectional diameter (L1) is larger than its cross-sectional diameter (L2) in the height direction. Waterproof construction of the opening and closing part of the housing according to Claim 1, characterized in that the seal (3) has a contact surface (3b) with the inner surface (11a) of the opening (11) of the housing (1) and has a circular cross-section. curved convex surface Waterproof construction of the opening and closing part of the housing according to Claim 1, characterized in that the seal (3) has a contact surface (3b) with the inner surface (11a) of the opening (11) of the housing (1). ) and the inclined surfaces (3f, 3g) on each side. claim