JPWO2010128606A1 - Waterproof structure of the opening / closing part of the equipment case - Google Patents

Abstract

Opening and closing of the equipment case where the packing is installed in the mounting groove provided on the outer peripheral surface of the cover and the packing is compressed between the inner surface of the opening and the mounting groove by fitting the cover into the opening of the equipment case In the waterproof structure of the part, the deterioration of the waterproof property and the mounting failure due to the twisting of the packing in the mounting groove are prevented. In order to achieve this object, the packing is formed so that the close contact surface with the bottom surface of the mounting groove is flat, and the cross-sectional diameter in the width direction is larger than the cross-sectional diameter in the height direction. In addition, as the mounting groove has a flat cross-sectional shape at the bottom surface, the packing has a flat cross-sectional shape at the contact surface with the bottom surface of the mounting groove, i.e., the inner peripheral surface, and at the opposite outer peripheral surface. The convex surface has an arc shape, and is formed in a D-shaped cross section as a whole.

Description

  The present invention relates to a structure for waterproofing an opening / closing part such as a connector cover part or a battery cover part in a case of a device.

  Some small electronic devices such as mobile phones and digital cameras have connector connection parts for data input / output and charging, and battery insertion parts. These connector connection parts and battery insertion parts have been established in equipment cases. A cover is detachably fitted into the opening. Such a gap between the case opening and the cover is conventionally sealed by an O-ring to be waterproof.

  FIG. 26 shows such a conventional waterproof structure. Reference numeral 100 is a case of a small electronic device, reference numeral 101 is an opening formed in the case 100, and reference numeral 200 is detachable from the opening 101. It is a cover to be fitted. A mounting groove 201 is provided around the outer peripheral surface of the cover 200, and an O-ring 202 is mounted in the mounting groove 201. The O-ring 202 is a packing made of a rubber-like elastic material having a circular cross section. When the cover 200 is fitted in the opening 101 of the case 100, the O-ring 202 and the cover 200 are arranged. A waterproof function is achieved by interposing in a compressed state with the bottom surface of the mounting groove 201 (see, for example, the following patent document).

  However, according to the conventional waterproof structure, the cover 200 is fitted into the opening 101 as shown in FIG. 26B from the state where the cover 200 is removed and the opening 101 is opened as shown in FIG. In the process, the O-ring 202 is twisted due to friction between the inner surface of the opening 101 and the bottom surface of the mounting groove 201, and the sealing performance (waterproofness) by the O-ring 202 may be impaired.

  Further, when the O-ring 202 is wound around the mounting groove 201 of the cover 200, the O-ring 202 is likely to be twisted, and there is a possibility that the sealing performance (waterproofness) may be impaired due to mounting failure.

JP 2008-289103 A JP 2007-73269 A

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

  As a means for effectively solving the technical problem described above, the waterproof structure according to claim 1 of the present invention has a packing mounted in a mounting groove provided around the outer peripheral surface of the cover, and the cover is attached to the case of the device. When the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting into the opening, the packing has a flat contact surface with the bottom surface of the mounting groove, The cross-sectional diameter in the width direction is larger than the cross-sectional diameter in the height direction.

  In the waterproof structure according to claim 2 of the present invention, a packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is inserted into the opening of the case by fitting the cover into an opening of a device case. The packing is compressed between the inner surface of the mounting groove and the bottom surface of the mounting groove, and the cross-sectional shape of the packing is flat with the bottom surface of the mounting groove. It is characterized in that it is flat on the close contact surface, that is, the inner peripheral surface, is an arc-shaped convex surface on the opposite outer peripheral surface, and is formed in a D-shaped cross section as a whole.

  In the waterproof structure according to claim 3 of the present invention, a packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is inserted into the opening of the case of the device by inserting the cover into the opening of the device. A fitting groove extending in an extending direction of the mounting groove is formed on the bottom surface of the mounting groove, and the packing is fitted with the fitting groove. A mating projection that can be mated is formed.

  The waterproof structure according to claim 4 of the present invention is the waterproof structure of the opening and closing part of the device case according to claim 3, wherein the mounting groove has a flat cross-sectional shape on its bottom surface, The packing has a cross-sectional shape that is flat on the inner surface of the mounting groove, that is, a flat surface on the inner peripheral surface, an arc-shaped convex surface on the outer peripheral surface on the opposite side, and is formed in a D-shaped cross section as a whole, The fitting protrusion is formed on the inner peripheral surface of the packing formed in a D-shaped cross section.

  The waterproof structure according to claim 5 of the present invention is the waterproof structure of the opening / closing part of the device case according to claim 3, wherein the mounting groove has a flat cross-sectional shape on the bottom surface, The packing has a fitting protrusion on the inner peripheral side that fits in the fitting groove, a sealing protrusion on the outer peripheral side that is in close contact with the inner surface of the opening, and a sealing protrusion on both sides in the width direction. It is characterized by being formed.

  Further, in the waterproof structure according to claim 6 of the present invention, a packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is inserted into the opening of the case by fitting the cover into an opening of a case of the device. The packing is compressed between the inner surface of the mounting groove and the bottom surface of the mounting groove, and the packing has a flat contact surface with the bottom surface of the mounting groove, and the close contact surface with the inner surface of the opening is a peak portion. It consists of slopes on both sides.

  In the waterproof structure according to claim 7 of the present invention, a packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is inserted into the opening of the case by fitting the cover into the opening of the case of the device. The packing is compressed between the inner surface of the mounting groove and the bottom surface of the mounting groove, and the cross-sectional shape of the packing is flat with the bottom surface of the mounting groove. This is characterized in that the contact surface is flat on the inner peripheral surface, that is, the outer peripheral surface on the opposite side is provided with a ridge and slopes on both sides thereof, and is formed in a pentagonal section as a whole.

  The waterproof structure according to claim 8 of the present invention is the waterproof structure of the opening / closing part of the device case according to claim 6 or 7, wherein the slope on the cover insertion direction side of the slopes on both sides of the ridge portion of the packing is provided. The slope is relatively gentle and the slope on the side opposite to the cover insertion direction is relatively steep.

  Furthermore, the waterproof structure according to claim 9 of the present invention is the waterproof structure of the opening and closing part of the device case according to claim 6 or 7, wherein the slope on the cover insertion direction side of the slopes on both sides of the ridge portion of the packing. Is relatively gentle, the slope on the opposite side to the cover insertion direction is relatively steep, and the ridge portion of the packing is unevenly distributed to the opposite side of the cover insertion direction from the central portion in the width direction of the packing. It is characterized by being.

  In the waterproof structure according to claim 1 of the present invention having the above-described configuration, the packing is flat at the close contact surface with the bottom surface of the mounting groove, and the cross-sectional diameter in the width direction is set larger than the cross-sectional diameter in the height direction. Therefore, compared to conventional O-rings that are easy to roll, the seating on the bottom surface of the mounting groove is stable, and even when subjected to a load in the torsion direction, it is difficult to twist, thus effectively preventing deterioration of waterproofness. it can.

  In the waterproof structure according to claim 2 of the present invention, the cross-sectional shape of the packing is flat on the bottom surface of the groove, that is, the cross-sectional shape of the packing is flat on the contact surface with the bottom surface of the groove, that is, the inner peripheral surface. The outer peripheral surface on the opposite side is an arc-shaped convex surface and is formed in a D-shaped cross section as a whole, so that the seating on the bottom surface of the mounting groove is more stable than the conventional O-ring that is easy to roll. Thus, even when a load in the twisting direction is applied, it becomes difficult to twist, and thus a reduction in waterproofness can be effectively prevented.

  In the waterproof structure according to claim 3, 4 or 5, the fitting protrusion formed on the packing is fitted into the fitting groove formed on the bottom surface of the mounting groove. As a result, the packing is restrained in the mounting groove, and even if it receives a load in the torsional direction, it becomes difficult to twist, so that it is possible to effectively prevent a decrease in waterproofness. According to the structure of Claim 4, since the inner peripheral surface of packing is flat cross-sectional shape, the seating to the bottom face of a mounting groove is stabilized. According to the fifth aspect of the present invention, the seal projection protruding to both sides in the width direction is in close contact with the bottom surface of the mounting groove, so that the seating on the bottom surface of the mounting groove is stabilized. Further, since the axial width of the outer peripheral seal projection closely contacting the inner surface of the opening is set to be smaller than the axial width of the entire packing, the compression reaction force in the mounted state is set to be small.

  Further, in the waterproof structure according to claim 6 of the present invention, since the tight contact surface with the bottom surface of the mounting groove in the packing is flat, the bottom surface of the mounting groove to the bottom surface of the mounting groove is easier than a conventional O-ring that is easy to roll. Sitting is stable, and even when subjected to a load in the torsional direction, it becomes difficult to twist, so that it is possible to effectively prevent a decrease in waterproofness. In addition, since the close contact surface with the inner surface of the opening of the case is composed of a ridge and slopes on both sides thereof, compared to the case where the close contact surface with the inner surface of the opening forms an arcuate convex surface, When the setting is the same, the compression reaction force is reduced, and the press-fit resistance when the cover is fitted into the opening of the case and the wear of the packing can be reduced. Therefore, it is possible to prevent the packing from being twisted and twisting of the packing in the groove due to repeated opening and closing of the cover, etc., and to reduce the press-fit resistance when the cover is fitted into the opening of the case, and to reduce the waterproof performance due to wear. Can be suppressed.

  In the waterproof structure according to claim 7 of the present invention, the cross-sectional shape of the packing is flat on the bottom surface thereof, and the cross-sectional shape of the packing is on the contact surface with the bottom surface of the mounting groove, that is, the inner peripheral surface. Due to the flat shape, the seating on the bottom of the mounting groove is more stable than conventional O-rings that are easy to roll, making it difficult to twist even when subjected to a load in the torsional direction, thus effectively reducing the waterproofness. Can be prevented. In addition, since the cross-sectional shape of the packing is such that the outer peripheral surface on the side opposite to the inner peripheral surface is provided with a ridge and slopes on both sides thereof, and is formed into a pentagonal cross section as a whole, it is in close contact with the inner surface of the opening. When the crushing allowance setting is the same compared to the surface having an arcuate convex surface, the compression reaction force is reduced, reducing the press-fit resistance when fitting the cover into the case opening and the wear of the packing. Can be reduced. Therefore, it is possible to prevent the packing from being twisted and twisting of the packing in the groove due to repeated opening and closing of the cover, etc., and to reduce the press-fit resistance when the cover is fitted into the opening of the case, and to reduce the waterproof performance due to wear. Can be suppressed.

  Furthermore, in the waterproof structure according to claim 8 or 9 of the present invention, the frictional resistance of the packing with the inner surface of the opening of the case is small in the cover insertion direction and large in the opposite direction. Moreover, since the surface pressure of the packing with respect to the inner surface of the opening of the case rises abruptly on the side opposite to the cover insertion direction with respect to the peak portion, the resistance against the water intrusion pressure from the outside increases. Therefore, the cover can be more easily fitted into the opening of the case, and the cover is firmly fitted from the opening of the case so that the cover is not easily dropped, thereby further improving the waterproof performance.

It is a perspective view which shows 1st embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention. Similarly, in the first embodiment, a state in which the packing is mounted in the groove is shown, (A) is a front view, and (B) is a side view in which a part of the packing is broken. Similarly, it shows an example of packing in the first embodiment, (A) is a front view, (B) is a BB cross-sectional view of (A). It is sectional drawing which expands and shows a part of packing of FIG. Similarly, in the first embodiment, it is an enlarged cross-sectional view showing a state in which a cover is fitted into an opening of a case. Similarly, in the first embodiment, it is an explanatory view showing a process of fitting the cover into the opening of the case. It is principal part sectional drawing which shows 2nd embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention. Similarly, in the second embodiment, a state in which the packing is mounted in the groove is shown, (A) is a front view, and (B) is a side view in which a part of the packing is broken. Similarly, the packing in 2nd embodiment is shown, (A) is a front view, (B) is B-B 'sectional drawing of (A). Similarly, in the second embodiment, it is a perspective view showing a state in which the packing is mounted in the packing mounting groove. It is principal part sectional drawing which shows 3rd embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention. Similarly, in the third embodiment, it is a cross-sectional view showing the shape of a cover and packing. Similarly, in the third embodiment, it is a perspective view showing a state in which the packing is mounted in the packing mounting groove. It is a perspective view which shows 4th embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention. Similarly, in the fourth embodiment, it is a cross-sectional perspective view showing a state in which a packing is mounted in a groove. Similarly, in the fourth embodiment, an example of a cover on which packing is mounted is shown, (A) is a plan view, (B) is a rear view, and (C) is a side view. Similarly, in the fourth embodiment, another example of a cover on which packing is mounted is shown, (A) is a plan view, (B) is a rear view, and (C) is a side view. Similarly, it is sectional drawing which shows the specific example of the packing in 4th embodiment. Similarly, in the fourth embodiment, it is an explanatory view showing a process of fitting the cover into the opening of the case. In 5th embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention, it is a cross-sectional perspective view which shows the state by which packing was mounted | worn in the groove | channel. It is sectional drawing which similarly shows an example of packing in 5th embodiment. Similarly, in the fifth embodiment, it is an explanatory view showing a process of fitting the cover into the opening of the case. It is explanatory drawing which similarly shows the surface pressure distribution of the packing in 5th embodiment. In 6th embodiment of the waterproof structure of the opening-and-closing part of the apparatus case which concerns on this invention, it is a cross-sectional perspective view which shows the state by which packing was mounted | worn in the groove | channel. It is sectional drawing which similarly shows an example of the packing in 6th embodiment. It is explanatory drawing which shows the process in which a cover is engage | inserted in the opening part of a case in the waterproof structure of the opening / closing part of the apparatus case which concerns on a prior art.

  Hereinafter, a preferred embodiment of a waterproof structure of an opening / closing part of an apparatus according to the present invention will be described with reference to the drawings.

First embodiment ...
First, in the perspective view of FIG. 1, reference numeral 1 is a case of a small electronic device, and reference numeral 2 is a cover that is detachably fitted into an opening 11 provided in the case 1.

  The opening 11 opened in the case 1 has a square shape with rounded corners, that is, the inner peripheral surface thereof has a plane portion and a curved surface portion alternately in the circumferential direction.

  The cover 2 has a plate shape as a whole. As shown in FIG. 5, the cover 2 is formed so as to be inserted from the insertion portion 21 that can be inserted into the opening 11 of the case 1 and the outer end portion of the insertion portion 21. And a flange 22 facing the outer surface 1a of the case 1.

  The outer peripheral surface 21a of the insertion portion 21 of the cover 2 has a projection shape with respect to the insertion direction substantially similar to the opening shape of the opening portion 11 of the case 1, that is, a rectangular shape with rounded corners as shown in FIG. And curved surface portions alternately in the circumferential direction, which is slightly smaller than the opening 11. A mounting groove (also simply referred to as “groove” or “packing mounting groove”) 23 is provided around the outer peripheral surface 21 a of the insertion portion 21, and the mounting groove 23 has a substantially U-shaped cross-sectional shape. That is, it comprises a flat bottom surface 23a parallel to the outer peripheral surface 21a of the insertion portion 21 and a pair of inner side surfaces 23b rising at right angles from both sides thereof.

  A packing 3 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) is attached to the mounting groove 23 described above. The packing 3 is formed in an annular shape as shown in FIG. 3A and has a D-shaped cross section as shown in FIG. Specifically, in the cross-sectional shape shown in FIGS. 4 and 5, the inner peripheral surface 3 a that is in close contact with the bottom surface 23 a of the mounting groove 23 is flat, protrudes to the outside of the mounting groove 23, and the inner surface of the opening 11 of the case 1. The outer peripheral surface 3b pressed in an appropriate deformation state is an arc-shaped convex surface. The inner peripheral surface 3a of the packing 3 corresponds to the close contact surface described in claim 1.

  Further, as shown in FIG. 4, the cross-sectional diameter L1 in the width direction of the packing 3 is larger than the cross-sectional diameter L2 in the height direction, that is, L2 / L1 <1. L2 is larger than the depth of the mounting groove 23.

  In the above-described configuration, the cover 2 is press-fitted into the opening 11 of the case 1 via the packing 3, and the packing 3 is attached to the bottom surface 23 a of the mounting groove 23 and the inner peripheral surface of the opening 11. By being sandwiched between 11a and 11a in a properly compressed state, the opening 11 is closed in a sealed state to achieve waterproofing.

  According to the present invention, the packing 3 has a flat inner peripheral surface 3a that is in close contact with the bottom surface 23a of the mounting groove 23 and L2 / L1 <1, so that a force in the rolling (twisting) direction is applied. In the process of fitting the cover 2 into the opening 11 as shown in FIG. 6B from the state where the opening 11 is opened as shown in FIG. The packing 3 is not twisted by friction with the inner peripheral surface 11a of the opening 11 and the bottom surface 23a of the mounting groove 23, and excellent sealing performance (waterproofness) by the packing 3 is ensured.

  Further, since the packing 3 is formed in an annular shape as shown in FIG. 3, the non-circular cover having a plane portion and a curved surface portion alternately in the circumferential direction as shown in FIG. 1 and FIG. When the O-ring as in the prior art is easily twisted when it is externally inserted into the insertion portion 21 and wound in the groove 23, the twist is obtained by making the packing 3 have a cross-sectional shape as shown in FIG. Since it becomes difficult, it can prevent effectively that sealing performance (waterproofness) is impaired by mounting | wearing defect.

Second embodiment ...
Next, FIGS. 7 to 10 show a second embodiment of the present invention.

  In FIG. 7, reference numeral 1 denotes a case of a small electronic device such as a mobile phone, and reference numeral 2 denotes a cover that is detachably fitted into the opening 11 provided as a connector insertion portion or the like in the case 1. The opening 11 of the case 1 has a square shape with rounded corners, that is, the inner peripheral surface 11a has a plane portion and a curved surface portion alternately in the circumferential direction. The cover 2 has a plate-like shape as a whole. The cover 2 is inserted into the opening 11 of the case 1 and is extended from the outer end of the insertion portion 21 so as to face the outer surface 12 of the case 1. And a flange 22 to be provided.

  The outer peripheral surface 21a of the insertion portion 21 of the cover 2 has a projection shape with respect to the insertion direction substantially similar to the opening shape of the opening portion 11 of the case 1, that is, a rectangular shape with rounded corners as shown in FIG. And curved surface portions alternately in the circumferential direction, which is slightly smaller than the opening 11. A mounting groove 23 is provided around the outer peripheral surface 21 a of the insertion portion 21 of the cover 2, and the packing 3 is mounted in the mounting groove 23.

  The mounting groove 23 includes a bottom surface 23a having a flat cross-sectional shape parallel to the outer peripheral surface 21a of the insertion portion 21 of the cover 2 and a pair of inner side surfaces 23b rising substantially vertically from both sides thereof, and is located at an intermediate position in the width direction of the bottom surface 23a. Is formed with a fitting groove 24 having a U-shaped cross section extending in the extending direction of the mounting groove 23.

  The packing 3 is formed in an annular shape as shown in FIG. 9A by a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity). As shown in FIG. 10, the cross section includes a main body 31 having a D-shaped cross section and a fitting protrusion 32 formed on the inner peripheral surface 31 a.

  Specifically, the main body 31 of the packing 3 is held in the mounting groove 23, and the inner peripheral surface 31 a that is in close contact with the bottom surface 23 a of the mounting groove 23 has a flat cross section, and the outside of the mounting groove 23. An outer peripheral surface 31b that protrudes and is pressed into contact with the inner peripheral surface 11a of the opening 11 of the case 1 in an appropriate deformation state forms a convex surface having an arcuate cross section, and a bottom surface 23a of the mounting groove 23 and an inner peripheral surface 11a of the opening 11 In order to prevent the filling rate of the main body portion 31 in the mounting groove 23 from becoming 100% or more even in a compressed state, a slight gap is provided with respect to the inner side surface 23b of the mounting groove 23. The fitting protrusion 32 is closely fitted in the fitting groove 24 formed on the bottom surface 23 a of the mounting groove 23.

  In the waterproof structure according to the second embodiment configured as described above, as shown in FIG. 7, the cover 2 is press-fit with the insertion portion 21 inserted into the opening 11 of the case 1 via the packing 3. When the main body 31 of the packing 3 is sandwiched between the bottom surface 23a and the fitting groove 24 of the mounting groove 23 and the inner peripheral surface 11a of the opening 11 in an appropriately compressed state, the opening 3 is opened. The part 11 is closed in a sealed state to achieve waterproofing.

  The packing 3 is constrained by closely fitting the fitting protrusion 32 with the fitting groove 24 formed on the bottom surface 23a of the mounting groove 23, so that the packing 3 has a rolling (twisting) direction shown in FIG. The resistance when the force F is applied is large. Therefore, in the process of fitting the cover 2 into the opening portion 11, the packing 3 (main body portion 31) is connected to the inner peripheral surface 11 a of the opening portion 11 and the bottom surface 23 a of the mounting groove 23. It is not twisted by friction, and an excellent sealing property (waterproofness) is ensured.

  Further, when the packing 3 is extrapolated to the insertion portion 21 of the non-circular cover 2 and wound around the mounting groove 23, the fitting protrusion 32 is inserted into the fitting groove on the bottom surface 23 a of the mounting groove 23 while lightly pressing the main body 31. 24, the fitting protrusion 32 is sequentially fitted into the fitting groove 24, so that the packing 3 (main body portion 31) is not twisted, and the sealing property (waterproofness) due to poor mounting. Can be effectively prevented from being damaged.

Third embodiment ...
Next, FIGS. 11 to 13 show a third embodiment of the present invention. The third embodiment differs from the second embodiment described above in the cross-sectional shapes of the fitting groove 24 and the packing 3.

  Specifically, the fitting groove 24 formed in the intermediate position in the width direction of the bottom surface 23a of the mounting groove 23 has a substantially U-shaped cross section as shown in FIGS.

  Further, the packing 3 has an inner-side fitting projection 32 having a convex surface having an arcuate cross section corresponding to the fitting groove 24, and an outer-side sealing projection 33 having a sectional shape symmetrical to the fitting projection 32 by 180 degrees. 11 and 12, the seal protrusions 34 and 35 on both sides in the width direction are 90 degrees symmetrical to the fitting protrusion 32 in a direction different from the fitting protrusion 32 and the seal protrusion 33 by 90 degrees. That is, it has a substantially cross-sectional shape.

  The fitting protrusion 32 of the packing 3 is closely fitted into the fitting groove 24 formed on the bottom surface 23a of the mounting groove 23, and the outer peripheral seal protrusion 33 protrudes to the outside of the mounting groove 23 and It is pressed against the inner peripheral surface 11a of the opening 11 in an appropriate deformed state. Further, the seal protrusions 34 and 35 on both sides in the width direction are held in the mounting groove 23, the tip is in close contact with the inner side surfaces 23 b and 23 b of the mounting groove 23, and the inner peripheral portion is in close contact with the bottom surface 23 a of the mounting groove 23. In order to form a convex surface having an arcuate cross section, a slight gap is formed with respect to the bottom surface 23a and the inner side surface 23b of the mounting groove 23 so that the packing rate of the packing 3 in the mounting groove 23 does not exceed 100%. It has become.

  In the waterproof structure according to the third embodiment configured as described above, as shown in FIG. 11, the cover 2 is press-fitted into the opening 11 of the case 1 through the packing 3. The packing 3 is sandwiched between the bottom surface 23a and the fitting groove 24 of the mounting groove 23 and the inner peripheral surface 11a of the opening 11 in an appropriately compressed state, whereby the opening 11 is sealed. It closes in a state and aims at waterproofing.

  In the packing 3, the fitting protrusion 32 on the inner peripheral side is closely fitted into the fitting groove 24 formed on the bottom surface 23 a of the mounting groove 23, and the tips of the seal protrusions 34 and 35 on both sides in the width direction are mounted. Since the inner surface 23b of the groove 23 is in close contact with the inner surface 23b, the resistance when the force F in the rolling (twisting) direction shown in FIG. 13 is applied is large, and therefore, in the process of fitting the cover 2 into the opening 11, The packing 3 is not twisted by friction with the inner peripheral surface 11a of the opening 11 and the bottom surface 23a of the mounting groove 23, and excellent sealing performance (waterproofness) is ensured.

  Further, when the packing 3 is extrapolated to the insertion portion 21 of the non-circular cover 2 and wound around the mounting groove 23, the fitting protrusion 32 is fitted to the bottom surface 23 a of the mounting groove 23 while lightly pressing the seal protrusions 33 to 35. If the fitting groove 32 is pushed into the fitting groove 24, the fitting protrusion 32 is sequentially fitted into the fitting groove 24, so that the packing 3 (main body portion 31) is not twisted. Property) can be effectively prevented.

  In the present invention, the fitting protrusion 32 is not necessarily continuous in an endless manner with respect to the extending direction of the packing 3, and can be intermittent. In this way, it is not necessary to perform the work of fitting the fitting protrusion 32 into the fitting groove 24 when the packing 3 is attached, and it is possible to prevent air from being trapped in the fitting groove 24.

Fourth embodiment ...

  Next, FIGS. 14 to 19 show a fourth embodiment of the present invention. Among them, in the perspective view of FIG. 14, reference numeral 1 is a case of a small electronic device, and reference numeral 2 is a case. 1 is a cover that is detachably fitted in the opening 11 for battery insertion or connector connection established in FIG.

  As shown in the example of FIG. 14, the opening 11 opened in the case 1 has a rectangular shape with rounded corners, an oblong shape (not shown), or the like. It has a plane part and a curved surface part alternately in the circumferential direction.

  The cover 2 has a plate shape as a whole. The cover 2 is inserted into the opening 11 of the case 1 and is extended from the outer end of the insertion portion 21 so as to face the outer surface 1 a of the case 1. And a flange 22 to be provided.

  The insertion portion 21 of the cover 2 has a projection shape with respect to the insertion direction that is substantially similar to the opening shape of the opening portion 11 of the case 1 and exhibits a square shape with rounded corners as in the example shown in FIG. There is an oval shape as in the example shown in FIG. 17, that is, it has plane portions and curved surface portions alternately in the circumferential direction, and is slightly smaller than the opening 11. As shown in FIGS. 15 and 16, a mounting groove 23 is provided on the outer peripheral surface 21a of the insertion portion 21. The mounting groove 23 has a substantially U-shaped cross-sectional shape. That is, it consists of a flat bottom surface 23a parallel to the outer peripheral surface 21a of the insertion portion 21 and a pair of inner side surfaces 23b rising at right angles from both sides thereof.

  A packing 3 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity) is attached to the mounting groove 23 of the cover 2.

  The packing 3 is formed in an annular shape and has a pentagonal cross section. As shown in FIG. 18, the height h in the radial direction is higher than the depth d of the mounting groove 23, and The inner peripheral surface 3a that is in close contact with the bottom surface is flat, and both side surfaces 3c and 3d that rise from both ends in the width direction have a flat shape perpendicular to the inner peripheral surface 3a, and protrude to the outside of the mounting groove 23. An outer peripheral surface that is press-contacted to the inner surface of one opening portion 11 in an appropriate deformation state includes a peak portion 3e and slopes 3f and 3g extending from the peak portion 3e toward both side surfaces 3c and 3d. The peak 3e is located in the center of the packing 3 in the width direction, and the slopes 3f and 3g on both sides of the peak 3e are equal to each other. The inner peripheral surface 3a corresponds to the “close contact surface with the bottom surface of the mounting groove” recited in claim 6 or 7.

  In the specific example shown in FIG. 18, the packing 3 has a width w of about 1.1 mm and a height h of about 1.0 mm, that is, h / w <1. Further, the angle θ between the inclined surfaces 3f and 3g is about 74 degrees, and the peak portion 3e is chamfered so as to form an R surface having a curvature radius of about 0.3 mm, and the inner circumferential surface 3a and the side surfaces 3c and 3d Corner portions of the corner portions and the side surfaces 3c, 3d and the inclined surfaces 3f, 3g are also chamfered so as to form an R surface having a curvature radius of about 0.2 mm.

  In the fourth embodiment configured as described above, the cover 2 has its insertion portion 21 press-fitted into the opening 11 of the case 1 via the packing 3, and the packing 3 is connected to the mounting groove 23. By being sandwiched between the bottom surface 23a and the inner surface 11a of the opening portion 11 in an appropriately compressed state, the opening portion 11 is closed in a hermetically sealed state for waterproofing.

  The packing 3 has a flat inner peripheral surface 3a that is in close contact with the bottom surface 23a of the mounting groove 23, and therefore has a large resistance when a force in the rolling (twisting) direction is applied. The frictional resistance with the inner surface 11a of the opening 11 due to force is small. Accordingly, the packing 3 is twisted in the process of fitting the cover 2 into the opening 11 as shown in FIG. 19B from the state in which the opening 11 is opened as shown in FIG. Therefore, excellent sealing performance (waterproofness) by the packing 3 is ensured. Moreover, since h / w <1 in the illustrated embodiment, this also contributes to prevention of twisting of the packing 3.

  Moreover, the packing 3 has a smaller compression reaction force than the packing 3 having a D-shaped cross section as shown in FIG. 4 described above, that is, the outer peripheral surface 3b is a convex surface having an arcuate cross section. In the case where the height h is the same, as shown by a one-dot chain line in FIG. 18, the outer peripheral surface is a ridge portion 3e and slopes 3f on both sides thereof, as compared with the packing 3 whose outer peripheral surface forms an arcuate convex surface. , 3 g of the packing 3 of this embodiment has a small volume at the outer peripheral portion, and therefore, if the crushing allowance δ is the same, the amount of compression is smaller than that of the packing 3 having a D-shaped cross section. For this reason, the frictional resistance of the packing 3 with respect to the inner surface 11a of the opening 11 is reduced, and the press-fitting resistance when the cover 2 is fitted into the opening 11 as shown in FIG. Can be reduced.

  In addition, as described above, the packing 3 has a flat inner peripheral surface 3a that is in close contact with the bottom surface 23a of the mounting groove 23, so that it is difficult to twist even during the mounting process to the mounting groove 23. It can prevent effectively that (waterproofness) is impaired.

Fifth embodiment ...
Next, FIG. 20 to FIG. 23 show a fifth embodiment of the present invention.

  In the fifth embodiment, the difference from the fourth embodiment described above is that, as shown in FIGS. 20 and 21, the peak portion 3e of the packing 3 is more opposite to the cover insertion direction than the center in the width direction. That is, the axial distance L3 between the ridge portion 3e and the side surface 3c on the cover insertion direction side is the same as that between the ridge portion 3e and the side surface 3d on the opposite side to the cover insertion direction. Of the slopes 3f and 3g on both sides of the peak portion 3e, the slope α of the slope 3f on the cover insertion direction side is relatively gentle, and the slope β of the slope 3g on the opposite side to the cover insertion direction is larger than the axial distance L4. A relatively steep slope, that is, α <β. Other parts can be basically configured in the same manner as in the fourth embodiment.

  Therefore, according to this configuration, as in the fourth embodiment, twisting of the packing 3 can be effectively prevented and wear of the packing 3 can be reduced.

  Further, since α <β, the frictional resistance of the packing 3 against the inner surface 11a of the opening 11 of the case 1 becomes small in the cover insertion direction, and as shown in FIG. As shown in FIG. 22 (B), the press-fit resistance when the cover 2 is fitted into the opening 11 is further reduced from the state in which the one opening 11 is opened. Since it becomes large with respect to the opposite direction, it becomes difficult for the cover 2 to inadvertently fall off from the opening 11.

  Further, as the peak 3e of the packing 3 is unevenly distributed to the side opposite to the cover insertion direction from the center in the width direction, the surface pressure P against the inner surface 11a of the opening 11 of the case 1 is increased as shown in FIG. Since it is distributed so as to rise suddenly on the side opposite to the insertion direction, the resistance against the intrusion pressure of water or the like from the outside increases, and the waterproof performance can be further enhanced.

  Note that if the offset amount of the peak portion 3e of the packing 3 is too large, the sealing performance may be lowered, and it may be difficult to smoothly open and close the cover 2. Therefore, L3: L4 is 1: 1 to 5: 1. It is desirable to be in the range.

Sixth embodiment ...
Next, FIGS. 24 and 25 show a sixth embodiment of the present invention.

  In the sixth embodiment, the peak portion 3e is located in the center of the packing 3 in the width direction, and the slope α of the slope 3f on the cover insertion direction side of the slopes 3f and 3g on both sides of the peak portion 3e is relative. The slope β of the slope 3g opposite to the cover insertion direction is relatively steep, that is, α <β. Therefore, the bottom 3h of the inclined surface 3g opposite to the cover insertion direction is formed in a concave shape due to the difference between the gradients α and β. Other parts can be basically configured in the same manner as in the fifth embodiment.

  Even in this configuration, as in the fifth embodiment, the twisting of the packing 3 can be effectively prevented, the wear of the packing 3 can be reduced, and α <β. The effect similar to the configuration is obtained, that is, the frictional resistance of the packing 3 against the inner surface 11a of the opening 11 of the case 1 is small in the cover insertion direction, and large in the direction opposite to the cover insertion direction, The surface pressure with respect to the inner surface 11a of the opening 11 of the case is distributed so as to rise suddenly on the opposite side to the cover insertion direction, and the resistance against the intrusion pressure of water or the like from the outside increases.

  Further, according to the sixth embodiment, when the width w and height h of the packing 3 shown in FIG. 25, the crushing allowance δ and the like are the same as those of the packing 3 shown in FIG. Since the compression amount (compression reaction force) is further reduced as compared with the packing 3 of FIG. 18, the press-fit resistance when the cover 2 is fitted into the opening 11 and the wear of the packing 3 can be further reduced.

DESCRIPTION OF SYMBOLS 1 Case 11 Opening part 2 Cover 21 Insertion part 22 Eaves part 23 Mounting groove 23a Bottom face 24 Fitting groove 3 Packing 3a Inner peripheral surface (close contact surface)
3b Outer peripheral surface 3c, 3d Side surface 3e Peak portion 3f, 3g Slope 3h Bottom portion 31 Body portion 32 Fitting projections 33, 34, 35 Seal projection

Claims (9)

A packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting the cover into the opening of the device case. In what
A waterproof structure for an opening / closing part of a device case, wherein the packing has a flat contact surface with a bottom surface of the mounting groove, and has a cross-sectional diameter in a width direction larger than a cross-sectional diameter in a height direction. A packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting the cover into the opening of the device case. In what
As the cross-sectional shape of the mounting groove is flat at the bottom surface, the packing has a flat cross-sectional shape at the close contact surface with the bottom surface of the mounting groove, that is, the inner peripheral surface, and the outer peripheral surface on the opposite side. The waterproof structure of the opening / closing part of the device case, wherein the waterproof structure is an arc-shaped convex surface and is formed in a D-shaped cross section as a whole. A packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting the cover into the opening of the device case. In what
A fitting groove extending in the extending direction of the mounting groove is formed on the bottom surface of the mounting groove,
A waterproof structure for an opening / closing part of a device case, wherein the packing is formed with a fitting projection capable of fitting with the fitting groove. In the waterproof structure of the opening and closing part of the device case according to claim 3,
As the cross-sectional shape of the mounting groove is flat at the bottom surface, the packing has a flat cross-sectional shape at the close contact surface with the bottom surface of the mounting groove, that is, the inner peripheral surface, and the outer peripheral surface on the opposite side. Is an arc-shaped convex surface, and is formed in a D-shaped cross section as a whole,
A waterproof structure for an opening / closing part of a device case, wherein the fitting protrusion is formed on an inner peripheral surface of a packing formed in a D-shaped cross section. In the waterproof structure of the opening and closing part of the device case according to claim 3,
As the cross-sectional shape of the mounting groove is flat at the bottom surface, the packing is fitted on the inner peripheral side of the opening and the inner peripheral side of the opening, and the inner peripheral side of the opening is fitted to the fitting groove. A waterproof structure for an opening / closing part of a device case, having a sealing protrusion on both sides in the width direction and a cross-shaped cross section. A packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting the cover into the opening of the device case. In what
The packing has a flat contact surface with the bottom surface of the mounting groove, and the close contact surface with the inner surface of the opening includes a ridge portion and slopes on both sides thereof. Waterproof structure. A packing is mounted in a mounting groove provided around the outer peripheral surface of the cover, and the packing is compressed between the inner surface of the opening and the bottom surface of the mounting groove by fitting the cover into the opening of the device case. In what
As the cross-sectional shape of the mounting groove is flat at the bottom surface, the packing has a flat cross-sectional shape at the close contact surface with the bottom surface of the mounting groove, that is, the inner peripheral surface, and the outer peripheral surface on the opposite side. A waterproof structure for an opening / closing part of an equipment case, characterized in that it has a ridge part and slopes on both sides thereof, and is formed in a pentagonal section as a whole. In the waterproof structure of the opening and closing part of the device case according to claim 6 or 7,
Of the slopes on both sides of the ridge of the packing, the slope on the cover insertion direction side is a relatively gentle slope, and the slope on the opposite side to the cover insertion direction is a relatively steep slope. Waterproof structure. In the waterproof structure of the opening and closing part of the device case according to claim 6 or 7,
Of the slopes on both sides of the ridge of the packing, the slope on the cover insertion direction side is a relatively gentle slope, the slope on the opposite side to the cover insertion direction is a relatively steep slope,
In addition, the waterproof structure of the opening / closing part of the device case is characterized in that the peak portion of the packing is unevenly distributed to the side opposite to the cover insertion direction from the central portion in the width direction of the packing.

Images