JP2014040847A - Waterproof packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof packing 1 hard to cause twist within a packing mount groove 21 and capable of suppressing abrasion.SOLUTION: A waterproof packing 1 is mounted in a packing mount groove 21 formed in one member 2 of a first member and a second member. The waterproof packing 1 includes: a main seal portion 11 having a convex tightly contacted with the other member 3 of the first member and the second member; a flat seat portion 12 tightly contacted with a bottom face 21a of the packing mount groove 21; and a constriction portion 13 having a shape scooped in both sides in a width direction at a position between the seat portion 12 and the main seal portion 11.

Description

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

  Small electronic devices such as mobile phones and digital cameras are equipped with connector connection parts for data input / output and charging, and battery insertion parts, and these connector connection parts and battery insertion parts are opened in the device case. A cover is detachably fitted to the part. Such a gap between the case opening and the cover is conventionally sealed by an O-ring to be waterproof.

  FIG. 5 shows such a conventional waterproofing technique. 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.

  The cover 200 has a plate shape as a whole and has an insertion portion 201 that can be inserted into the opening 101 of the case 100. The insertion portion 201 has a projection shape with respect to the insertion direction that is substantially similar to the opening shape of the opening 101 and has a rectangular shape with rounded corners as shown in FIG. 6 or a long shape as shown in FIG. There are circular shapes and the like, that is, it has plane portions and curved surface portions alternately in the circumferential direction, and is slightly smaller than the opening 101. A packing mounting groove 202 is provided around the outer peripheral surface of the insertion portion 201, and an O-ring 203 is mounted in the groove 202.

  The O-ring 203 is a packing made of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity) having a circular cross section, and in the state where the cover 200 is fitted into the opening 101 of the case 100, the opening A waterproof function is achieved by being interposed in a compressed state between the inner surface (inner peripheral surface) of 101 and the bottom surface of the packing mounting groove 202 of the cover 200 (see, for example, Patent Documents 1 and 2 below).

  However, according to the conventional technique, the cover 200 is inserted into the opening 101 as shown in FIG. 5B from the state where the cover 200 is removed and the opening 101 is opened as shown in FIG. When the operation is repeated, the O-ring 203 is twisted due to friction between the inner surface of the opening 101 and the bottom surface of the packing mounting groove 202, and the sealing performance (waterproofness) by the O-ring 203 may be impaired. Further, the O-ring 203 is likely to be twisted when it is wound around the packing mounting groove 202, and there is a possibility that the sealing performance (waterproofness) may be impaired due to poor mounting.

  As a countermeasure against such twisting, it is conceivable to use a D-ring 204 as shown in FIG. The D-ring 204 is a packing made of a rubber-like elastic material having a D-shaped cross section. The D-ring 204 is mounted so that the flat surface 204a is in close contact with the bottom surface 202a of the packing mounting groove 202, and the cover 200 is opened. The convex surface 204b is brought into close contact with the inner surface of the opening 101 of the case 100 in a state of being fitted into the portion 101 (see, for example, Patent Document 3 below).

JP 2008-289103 A JP 2007-73269 A WO2010 / 128606

  However, when the D-ring 204 is used as shown in FIG. 8, the reaction force against compression is larger than that of the O-ring 203 as shown in FIG. There is a problem that not only the resistance when fitting into 101 is increased, but also the sealability (waterproofness) tends to become unstable due to early wear.

  The present invention has been made in view of the above points, and its technical problem is to provide a waterproof packing that is less likely to be twisted in the packing mounting groove and that can suppress wear. It is to provide.

  As means for effectively solving the technical problem described above, the waterproof packing according to the present invention is a packing mounted in a packing mounting groove formed in one of the first member and the second member. A main seal portion having a convex surface in close contact with the other member of the first member and the second member, a flat seat portion in close contact with the bottom surface of the packing mounting groove, and the seat portion and the main member. It is characterized by comprising a constricted portion having a shape that is formed on both sides in the width direction at a position between the seal portion.

  According to the waterproof packing according to the present invention, since the mounting state is stabilized by being in close contact with the bottom surface of the packing mounting groove with a flat seating portion, the twisting in the packing mounting groove is unlikely to occur, and the seating portion and the main packing are prevented. The constricted portion formed between the seal portion reduces the reaction force against compression between the first member and the second member, and the main seal portion slides with the first member or the second member. Even when subjected to friction in the width direction, the main seal part is easily deformed in the direction to reduce friction around the constricted part, reducing frictional resistance and concentrating on a narrow range of wear. For this reason, it is possible to maintain excellent sealing performance (waterproofness) over a long period of time.

It is sectional drawing which shows 1st embodiment of the waterproofing packing which concerns on this invention. It is sectional drawing of the mounting state which shows 1st embodiment of the waterproofing packing which concerns on this invention. It is sectional drawing which shows 2nd embodiment of the waterproofing packing which concerns on this invention. It is sectional drawing of the mounting state which shows 3rd embodiment of the waterproofing packing which concerns on this invention. It is explanatory drawing which shows the process in which the cover equipped with the waterproof packing which concerns on the prior art is engage | inserted in the opening part of a case. It is explanatory drawing which shows an oval cover. It is explanatory drawing which shows the cover of the shape which rounded the square corner | angular. It is sectional drawing which shows the prior art using D ring.

  Hereinafter, preferred embodiments of the waterproof packing according to the present invention will be described with reference to the drawings. First, FIG.1 and FIG.2 shows 1st embodiment of the waterproofing packing which concerns on this invention.

  That is, the waterproof packing 1 of this embodiment is formed of a rubber-like elastic material (rubber material or a synthetic resin material having rubber-like elasticity), and as shown in FIG. The flat seat portion 12 faces away from the main seal portion 11 and the constricted portion 13 is formed between the seat portion 12 and the main seal portion 11.

  The main seal portion 11 has an angled convex surface with a gentle cross section, that is, has a flange portion 11a in the middle in the width direction and gentle slopes 11b and 11c on both sides thereof. Further, the widths of the main seal portion 11 and the seating portion 12 are substantially the same, and the side surfaces 13a and 13b of the constricted portion 13 between them are arranged so that the deformation stress is not partially concentrated. The side surfaces 11d and 11e and the side surfaces 12a and 12b of the seating portion 12 are curved continuously.

  The packing 1 is mounted in a packing mounting groove 21 formed on the outer peripheral surface of the cover 2 as shown in FIG. 2, for example, and is compressed between the inner surface 3 b of the opening 3 a of the case 3. By interposing it, a waterproof function is achieved. The cover 2 corresponds to "one member of the first member and the second member" described in claim 1, and the case 3 corresponds to "the other member of the first member and the second member". It is equivalent. Specifically, the opening 3a of the case 3 is established as a connector connection part or a battery insertion part, for example, and the cover 2 is a connector cover or a battery cover that opens and closes the connector connection part or the battery insertion part.

  In the mounting state shown in FIG. 2, the packing 1 has the seating portion 12 in close contact with the bottom surface 21 a of the packing mounting groove 21 in the cover 2 with an appropriate surface pressure, and the main seal portion 11 protrudes from the packing mounting groove 21. By fitting the cover 2 into the opening 3 a of the case 3, the main seal portion 11 comes into close contact with the inner surface 3 b of the opening 3 a with an appropriate surface pressure.

  According to the packing 1 having the above-described configuration, the flat seating portion 12 is in close contact with the bottom surface 21a of the packing mounting groove 21, so that the mounting state is stable. Therefore, the cover 2 is fitted into the opening 3a of the case 3. Or twisting the packing 1 when the cover 2 is opened from the opening 3a. For this reason, the fall of the sealing performance (waterproofness) by twist can be prevented effectively.

  Further, the packing 1 has a thickness reduced in the width direction at a constricted portion 13 formed at a position between the seating portion 12 and the main seal portion 11, and the rigidity is appropriately reduced. The reaction force against compression between the bottom surface 21a of the groove 21 and the inner surface 3b of the opening 3a of the case 3 facing the groove 21 is reduced. Accordingly, the surface pressure of the main seal portion 11 with respect to the inner surface 3b is reduced, so that the slip resistance when the cover 2 is fitted into the opening 3a of the case 3 or the cover 2 is opened from the opening 3a is reduced. Work can be facilitated.

  Further, for example, in the process of fitting the cover 2 into the opening 3a of the case 3 as indicated by an arrow X in FIG. 2, the flange portion 11a of the main seal portion 11 (close to the inner surface 3b of the opening 3a of the case 3) The main seal portion 11 swings and displaces in a direction to reduce friction as indicated by an arrow F in FIG. For this reason, the frictional resistance is reduced, and the main seal portion 11 has the slopes 11b and 11c on both sides of the flange portion 11a formed with a gentle slope, so that the wear range is wide on both sides of the flange portion 11a due to the swinging displacement. Distributed to range. Therefore, premature wear due to the concentration of wear in a narrow range can be prevented, and sealing performance (waterproofness) can be maintained over a long period of time.

  Next, FIG. 3 shows a second embodiment of the waterproof packing according to the present invention. As in the first embodiment, the waterproof packing 1 according to this embodiment is basically the same as the main seal portion 11, the flat seat portion 12 facing the opposite side of the main seal portion 11, and the seat portion 12. It consists of a constricted portion 13 having a shape that is formed on both sides in the width direction at a position between the main seal portion 11.

  For this reason, the second embodiment also achieves the same effect as the first embodiment, but the first embodiment is different in that the main seal portion 11 has a convex surface that bulges into an arcuate surface. For this reason, even if the main seal portion 11 swings and displaces as shown by the arrow F around the constricted portion 13 due to friction with the inner surface 3b of the opening 3a of the case 3. Since the crushing margin for the inner surface 3b hardly changes, local increase in wear is suppressed, and in this respect, early wear can be effectively suppressed.

FIG. 4 shows a third embodiment of the waterproof packing according to the present invention. As in the first embodiment, the waterproof packing 1 according to this embodiment is basically the same as the main seal portion 11, the flat seat portion 12 facing the opposite side of the main seal portion 11, and the seat portion 12. be comprised of a neck portion 13 having a shape gouge the width direction on both sides at a location between the main seal portion 11, the width W ₁₁ of the main seal portion 11 is slightly smaller point than W ₁₂ of the seat 12 This is different from the first embodiment.

  With this configuration, for example, even when one side surface 12b in the width direction of the seating portion 12 of the packing 1 is in contact with one inner surface 21b of the packing mounting groove 21, the main seal portion positioned on the outer peripheral side thereof 11 and the inner surface 21b of the packing mounting groove 21, there is a gap δ. Therefore, in the process of fitting the cover 2 into the opening 3a of the case 3 as shown by the arrow X in FIG. The main seal part 11 of the packing 1 centering on the constricted part 13 is favorably displaced.

DESCRIPTION OF SYMBOLS 1 Waterproofing packing 11 Main seal part 12 Seating part 13 Constriction part 2 Cover (one member among a 1st member and a 2nd member)
21 packing mounting groove 3 case (the other member of the first member and the second member)

Claims (1)

  A packing mounted in a packing mounting groove formed in one member of the first member and the second member, wherein the main member forms a convex surface in close contact with the other member of the first member and the second member It comprises a seal portion, a flat seat portion that is in close contact with the bottom surface of the packing mounting groove, and a constricted portion that is formed on both sides in the width direction at a position between the seat portion and the main seal portion. Waterproof packing.

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