JP2006275744A - Sealing structure for case body, and timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sealing structure for a case body capable of reducing a size of the case body, capable of thinning the width or the like, and capable of increasing the flexibility of design arrangement and structure design, by thinning the case and by reducing cores, while securing sealability of the sealing structure that uses a packing. <P>SOLUTION: In this sealing structure for the case body, the first case member 11 constituting the case body for equipments is jointed to the second case member 13 with the packing 18 interposed therebetween; a packing storage groove 11x, provided with an opening part 11xb opened toward an inside of the case body, is formed in at least one of the the first case member 11 and the second case member 13; and a packing storage space constituted of the packing storage groove 11x has a cross-sectional shape with a height of the outer side of the case body being larger than that in an opening part 11xb side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a case body sealing structure and a timepiece, and more particularly to a sealing structure suitable for sealing a watch case and a back cover of a wristwatch using a packing.

In general, a waterproof watch such as a wristwatch is sealed by interposing a packing made of synthetic rubber or the like between a watch case and a back cover to ensure the required waterproofness. As such a sealing structure, a packing groove is usually formed when the watch case and the back cover are joined by forming a concave groove in the joint surface that contacts the back cover of the watch case. There is. In addition, a concave groove having an opening on the inner side is formed on the joint surface in contact with the back cover of the watch case, and a core disposed opposite to the opening of the concave groove is provided on the inner surface of the back cover. When the watch case and the back cover are joined, the opening of the groove is closed with a core so that the joined watch case and the back cover constitute a packing box. Is known (for example, see Patent Document 1 below).
Japanese Utility Model Publication No.59-74378

  However, in the sealed structure in which the above-described packing box is configured, the watch case is thickened by providing the inner wall of the concave groove inside the watch case, or the above-described core is disposed inside the watch case. Even so, there is a problem that the outer shape of the watch case becomes large in order to secure the internal space of the watch case.

  In particular, in recent years, there has been an increase in demand for narrow and narrow models (bracelet type) such as women's hands (for women), so watches with reduced width in the 3 o'clock-9 o'clock direction or 12 o'clock-6 o'clock direction. The number of cases is increasing, but there is a limit to the reduction in the width of the movement accommodated inside the watch case. There is a problem that can not be.

  Therefore, the present invention solves the above problems, and its purpose is to make the case thinner and reduce the core while ensuring the sealing property of the sealing structure using the packing. An object of the present invention is to provide a sealed structure of a case body that can be reduced in size, narrowed, etc., and can increase the degree of freedom in design and structural design.

  In view of such a situation, the case body sealing structure of the present invention is a case body in which a first case member and a second case member constituting a case body of a device are joined together with a packing interposed therebetween. In the hermetically sealed structure, at least one of the first case member and the second case member is formed with a packing housing groove having an opening opened inside the case body, and is configured by the packing housing groove. The packing housing space has a cross-sectional shape in which the height on the opposite side of the opening is larger than the height of the opening.

  According to this invention, since the packing housing groove has the opening portion opened inside the case body, the thickness of the inner wall portion of the conventional groove is not required, and other members for closing the opening portion are also provided. Since it becomes unnecessary, the thickness of the joint portion between the first case member and the second case member can be reduced, and the space inside the case body is not occupied. Therefore, it is possible to reduce the size and width of the device or increase the degree of freedom in design and structural design, such as making it possible to reduce the outer shape of the case body while securing the internal space. Further, the packing accommodating space constituted by the packing accommodating groove has a cross-sectional shape in which the height on the opposite side is larger than the height on the opening side, so that the packing accommodated in the packing accommodating space is inside the case body. It is possible to prevent the sealing performance from being lowered by moving toward or protruding inside.

  In this invention, it is preferable that the said packing accommodation groove | channel has an inner surface part inclined in the direction where the said groove depth increases toward the opposite side from the said opening part side. According to this, since the packing is in contact with the inclined inner surface portion, a compressive stress is received on the opposite side of the opening portion, so that the sealing performance can be ensured more reliably.

  In the present invention, the opening has an open area where the opening is opened inside the case body in a part of the packing housing groove in the extending direction, and the area where the opening is not formed in the remainder, or the opening is another It is preferable to have a closed region closed by the member. According to this, since the thickness of the joint portion of the first case member and the second case member can be reduced in the open region, and the packing can be securely held in the closed region, the case body Depending on the shape, it is possible to achieve a high level balance between reducing the thickness of the joint and ensuring the sealing performance. For example, when an elongated model is to be formed with a wristwatch or a watch-type device, the length in the 12 o'clock to 6 o'clock direction can be sufficiently secured, so that the joint portion in that direction is a closed region, and the width in the 3 o'clock to 9 o'clock direction is In order to reduce this, it is preferable that the joint portion in the direction be an open region. On the contrary, in order to reduce the width in the 12 o'clock to 6 o'clock direction, the joint portion in the direction may be an open region, and the joint portion in the 3 o'clock to 9 o'clock direction may be a closed region. The pair of joint portions of the case body facing each other in this way is used as a closed region, and a pair of open regions are provided between the closed regions, so that the packing can be securely held even before the case body is assembled. Therefore, the state in which the packing is assembled can be stabilized, and the sealing function can be reliably obtained.

  In the present invention, it is preferable that the packing has a cross-sectional shape that is thicker on the outer side than on the inner side without receiving external stress. According to this, since the packing has a thicker cross-sectional shape on the outer side than the inner side, the shape corresponds to the cross-sectional shape of the packing receiving groove, so that the sealability due to the movement of the packing to the inner side and the protrusion to the inner side is obtained. Can be reliably prevented.

  In the present invention, it is preferable that the packing has a surface inclined in a direction in which the packing gradually becomes thicker from the inside to the outside in a state where it is in contact with the inner surface of the packing housing groove without receiving external stress. . According to this, since the inclined surface as described above comes into contact with the inner surface of the packing housing groove, it is possible to more reliably prevent the packing from moving inward or protruding into the inside.

  In the present invention, the packing has a surface having a convex contour from the inner side to the outer side on the side in contact with the inner surface of the packing housing groove in a state where no external stress is applied, and the apex portion of the surface Is disposed on the back side of the opening, and is preferably in contact with the inner surface of a portion having a groove depth larger than the groove depth in the opening. According to this, by having a convex surface on the side in contact with the inner surface of the packing housing groove, the packing is easily deformed corresponding to the groove depth of the packing housing groove, and the apex portion of the surface is opened. By abutting against the inner surface of the portion having a larger groove depth than the portion, it is possible to more reliably prevent the packing from moving inward or protruding into the inside.

  Next, a timepiece according to the present invention includes the case body sealing structure according to any one of the above. According to this, the timepiece sealing structure can be configured, and at the same time, the timepiece can be reduced in size and width, or the degree of freedom in design and structural design can be increased. In this case, it is preferable that the first case member is a watch case and the second case member is a back cover.

  According to the present invention, it is possible to reduce the thickness of the case joint portion while ensuring the sealing performance, thereby reducing the size and width of the device, or increasing the degree of freedom in design / structural design. It is possible to achieve an excellent effect of being able to.

[First Embodiment]
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic longitudinal sectional view showing a case structure of a timepiece (a wristwatch or a main body of a wristwatch-type device) 10 according to the first embodiment of the present invention. In FIG. 1, the left part of the alternate long and short dash line in the center of the drawing shows a cross-sectional structure at 12 o'clock to 6 o'clock, and the right part of the same dot and dash line shows a cross-sectional structure at 3 o'clock to 9 o'clock. Direction).

  The timepiece 10 includes a timepiece case (trunk) 11, a display window (glass) 12 attached and fixed to the front side of the timepiece case 11, and a back cover 13 attached and fixed to the back side of the timepiece case 11. Has a body. An internal device 14 such as a movement is disposed inside the case body, a display plate 15 such as a dial is disposed on the front side of the internal device 14, and the internal device 15 is disposed on the front side of the display plate 15. A display means 16 such as a pointer driven by is provided. An external operation member 17 is attached to the side of the watch case 11.

  In the present embodiment, a packing 18 is interposed at the joint between the watch case 11 and the back cover 13, and the seal between the watch case 11 and the back cover 13 is secured by the packing 18. The packing 18 is housed in a packing housing groove 11 x provided at the joint portion of the watch case 11.

  2 is a schematic perspective view of the case back 13, FIG. 3 is an enlarged partial sectional view showing a joint portion of the watch case 11 and the case back 13 in the 12: 00-6 o'clock direction, and FIG. It is an expanded partial sectional view which shows the junction part of the hour-9 o'clock direction.

  The case back 13 is integrally provided with a core portion 13x inserted along the wall surface of the case inside the watch case 11, and this core portion 13x is provided with an engaging projection 13y shown in FIGS. The engaging projection 13y is fitted into an engaging recess 11y shown in FIG. 3 formed on the inner surface of the watch case 11, whereby the watch case 11 and the back cover 13 are joined to each other with the packing 18 interposed therebetween. It is supposed to be fixed. In the present specification, “joining” refers to a state in which they are simply brought into contact with each other, and is not limited to a case where they are bonded or fixed.

  In the present embodiment, the packing housing groove 11x is formed in a single concave groove shape having an opening 11xa that opens to the back cover 13 side and an opening 11xb that opens to the inside of the watch case. The opening 11xa of the packing housing groove 11x is closed by the back cover 13. Further, as shown in FIG. 3, the opening portion 11xb is closed by the core portion 13x in the region of the 12 o'clock to 6 o'clock direction, but the core portion 13x does not exist in the region of the 3 o'clock to 9 o'clock direction. For this reason, as shown in FIG. 4, the watch case 11 remains open toward the inside of the watch case 11. Here, as shown in FIG. 3, the core portion 13 x exists in a pair of portions facing each other of the back cover 13, so that the packing 18 is surely placed in a proper position even before the watch case 11 and the back cover 13 are assembled. And since it is held stably, the assembly position of the packing 18 becomes accurate after the watch case 11 and the back cover 13 are assembled, and the assembled state is also stable, so that the sealing function by the packing 18 can be obtained easily and reliably. It becomes possible.

  The packing housing groove 11x includes an inner surface portion (that is, a portion serving as a groove bottom surface when viewed from the opening portion 11xa) 11xp facing the joint surface 13a of the back cover 13, and an inner surface portion on the opposite side of the opening portion 11xb. (That is, the innermost part when viewed from the opening 11xb side, and the portion serving as the inner surface of the groove when viewed from the opening 11xa side). The inner surface portion 11xp is inclined so as to gradually become deeper from the opening portion 11xb side toward the opposite side (back side). On the other hand, the joining surface 13a of the back cover 13 is basically flat. Thereby, the height of the packing accommodation space comprised by the packing accommodation groove | channel 11x is gradually enlarged toward the back | inner side from the opening part 11xb. The inner surface portion 11xq is inclined so that the opening portion 11xa side gradually becomes wider. Thereby, the width measured along the joint surface 13a of the packing housing groove 11x is configured to gradually increase from the back toward the opening 11xa.

  In the present embodiment, when the inner surface portion 11xp of the packing receiving groove 11x provided in the watch case 11 is opened in the watch case 11 in the region of the 3 o'clock to 9 o'clock direction, Compared with, the thickness of the inner wall portion of the concave groove is unnecessary, and accordingly, the thickness at the joint portion of the watch case 11 can be reduced. In addition, the core 13x provided on the back cover 13 is formed in the region at 12 o'clock-6 o'clock (closed region), but is formed in the region at 3 o'clock-9 o'clock (open region). Therefore, an internal space corresponding to the thickness of the core portion 13x can be secured in the 3 o'clock to 9 o'clock region. Therefore, the outer shape of the watch case 11 can be reduced as a whole, and in particular, the outer shape of the watch case 11 can be reduced in the region of 3 o'clock to 9 o'clock, whereby the watch case can be narrowed.

  Further, in the present embodiment, the packing housing groove 11x is inclined so as to gradually become deeper from the opening 11xb side toward the back side, so that the watch case 11 and the back cover 13 are connected with the packing 18 interposed therebetween. When bonded, the packing 18 receives stress toward the inner side opposite to the opening 11xb, so that the packing 18 moves from the packing housing space to the opening 11xb or from the opening 11xb. It is possible to prevent the packing 18 from protruding to the inside. Therefore, the sealing property between the watch case 11 and the case back 13 can be ensured, and the required waterproofness can be realized.

  Normally, when a closed packing box is configured, the volume or cross-sectional area of the packing 18 is preferably about 115 to 120% with respect to the volume or cross-sectional area of the packing box. However, it is desirable that the volume or cross-sectional area of the packing 18 be as large as the above with respect to the volume or cross-sectional area of the packing storage space formed by the packing storage groove 11x. In particular, in the case of the present embodiment, since the opening 11xb is open in the 3 o'clock to 9 o'clock region, if the packing 18 may slightly protrude from the opening 11xb, the volume or breakage of the packing 18 may occur. The area ratio may be set to be slightly larger than the conventional one. For example, it is desirable to design the ratio according to the material of the packing 18 within a range of 110 to 135% of the volume or cross-sectional area of the packing housing space.

[Comparative example]
The above effects can be easily understood by comparing with the comparative example shown in FIG. FIG. 10 is a schematic longitudinal sectional view showing a sectional structure of a comparative example. Since the timepiece 10 'of this comparative example has the same configuration as that of the present embodiment except for the cross-sectional shape of the packing receiving groove 18', the same portions are denoted by the same reference numerals, and the description thereof is omitted.

  The packing receiving groove 18 'of the timepiece 10' has not only the opening 11xa 'but also the opening 11xb' as in the above embodiment, but the inner surface 11xp 'faces from the opening 11xb' to the back. This is formed horizontally, whereby the groove depth of the packing housing groove 11x ′, that is, the height of the packing housing space is made substantially constant from the opening 11xb ′ side toward the back.

  Even in this comparative example, the watch case can be reduced in size as in the above embodiment. However, when the watch case 11 and the back cover 13 are brought into close contact with each other, the packing 18 is brought closer to the opening 11xb ′ side by the compressive stress. As a result, the airtightness between the watch case 11 and the back cover 13 may deteriorate, or the pressure resistance may decrease.

  Further, in this comparative example, when the watch case 11 and the back cover 13 are joined, the amount of movement to the inside of the packing 18 or the amount of protrusion from the opening 11xb ′ varies due to the cracking or bending of the packing 18. The setting of the volume or cross-sectional area of the packing housing groove 11x ′ becomes almost meaningless. Further, as a method for improving the sealing performance in the comparative example, it is conceivable to increase the ratio of the volume or the cross-sectional area of the packing housing groove 11x ′ (packing housing space) with respect to the volume or the cross-sectional area of the packing 18. Since the compressive stress increases as the value increases, the amount of movement toward the inside of the packing 18 and the amount of protrusion from the opening 11xb ′ also increase.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described with reference to FIG. In this embodiment, since it has the same configuration as that of the first embodiment except for the cross-sectional shape of the packing 28, only the structure of the joining portion and the cross-sectional shape of the packing are shown, and the description of the other structure is omitted. Further, in FIG. 5, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the thickness of the packing 28 gradually increased from the inner portion 28a disposed on the opening 11xb side toward the outer portion 28b disposed on the opposite side (back side) from the opening 11xb. It has a cross-sectional shape. For example, the upper surface 28u of the packing 28 is an inclined surface that gradually moves upward from the inner portion 28a toward the outer portion 28b. Further, the lower surface 28d of the packing 28 is also an inclined surface that gradually goes downward from the inner portion 28a toward the outer portion 28b.

  In the present embodiment, since the thickness of the packing 28 is configured to be thicker toward the outer side, it is easy to receive the compressive stress toward the oblique outer side received from the inner surface portion 11xp when the packing 28 is received in the packing receiving groove 11x. In the packing housing groove 11x, the packing 28 is further easily pressed to the side (outside) opposite to the opening 11xb. Therefore, since the movement to the inside of the packing 28 and the protrusion from the opening portion 11xb can be further reduced, the sealing property between the watch case 11 and the back cover 13 can be obtained more reliably.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIG. Since this embodiment also has the same configuration as that of the first embodiment except for the cross-sectional shape of the packing 38, only the structure of the joining portion and the cross-sectional shape of the packing are shown, and the description of the other structures is omitted. In FIG. 6, the same reference numerals are given to portions corresponding to the first embodiment, and description thereof is omitted.

  In the present embodiment, the packing 38 is configured such that the contour of the upper surface 38u that contacts the inner surface portion 11xp of the packing housing groove 11x is a convex curve from the opening portion 11xb side to the opposite side. And the vertex part 38t of the said upper surface 38u is contact | abutting in the inner surface part 11xp in the back | inner side rather than the opening part 11xb, and having a groove depth larger than the groove depth in the opening part 11xb. Further, the lower surface 38d of the packing 38 that is in contact with the flat joint surface 13a of the back cover 13 is configured to be flat.

  In the present embodiment, since the packing 38 includes the above-described upper surface 38u, the upper portion of the packing is easily deformed, so that the packing 38 is easily brought into close contact with the shape of the inner surface portion 11xp. Since the holding force increases, the sealing property can be more reliably ensured.

  Further, the apex portion 38t of the upper surface 38u is disposed on the back side of the opening portion 11xb in the inner surface portion 11xp, and is in contact with a portion having a groove depth larger than the groove depth in the opening portion 11xb. The apex portion 38t is less likely to move toward the opening portion 11xb and is deformed along the inner surface portion 11xp at a portion away from the opening portion 11xb, so that the holding force of the packing 38 in the packing housing groove 11x can be further increased. . In particular, in the present embodiment, the vertex portion 38t is in contact with the inner surface portion 11xp that is inclined so that the groove depth gradually increases toward the inner side opposite to the opening portion 11xb. Since it deforms to the back side, the holding force of the packing 38 by the packing housing groove 11x can be further increased.

  The packing 38 includes an upper surface 38u having a convex curved contour, but the contour is not limited to a convex curved shape such as an arc shape or a parabolic shape, and includes an inverted V shape. As long as it has a convex shape, the above-described effects can be achieved.

[Fourth Embodiment]
Next, a fifth embodiment according to the present invention will be described with reference to FIG. In this embodiment, since it has the same configuration as the first embodiment except for the cross-sectional shape of the packing receiving groove 21x provided in the watch case 21, only the structure of the joint portion and the cross-sectional shape of the packing are illustrated. The description of the structure is omitted. Further, in FIG. 7, parts corresponding to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the packing accommodating groove 21x has a single-concave groove shape having the opening portions 21xa and 21xb similar to the above, but the inner surface portion provided at the back of the opening portion 21xa has an opening portion 21xb side. The edge surface portion 21xr formed on the inner surface and the back surface portion 21xs formed at a position deeper than the edge surface portion 21xr are provided.

  In the packing housing groove 21x, many portions of the packing 18 abut on the back surface portion 21xs, and the packing 18 is caught by a step between the edge surface portion 21xr and the back surface portion 21xs, so that the packing 18 escapes from the packing housing groove 21x. Therefore, it is possible to ensure the sealing performance.

  In this embodiment, the sealing performance can be further improved by using the packing having the cross-sectional shape such as the packings 28 and 38.

[Fifth Embodiment]
Next, a fifth embodiment according to the present invention will be described with reference to FIG. In this embodiment, since it has the same configuration as that of the first embodiment except for the cross-sectional shape of the packing receiving groove 31x provided in the watch case 31, only the cross-sectional shape of the structural packing at the joining portion is illustrated. The description of the structure is omitted. Moreover, in FIG. 8, the same code | symbol is attached | subjected to the part corresponding to 1st Embodiment, and those description is abbreviate | omitted.

  In the present embodiment, the packing receiving groove 31x has a single-concave groove shape having openings 31xa and 31xb similar to those described above, but the inner surface provided at the back of the opening 31xa has an opening 31xb side. An edge surface portion 31xr formed on the inner surface and a back surface portion 31xs formed in a concave shape deeper than the edge surface portion 31xr are provided. Specifically, the back surface portion 31xs includes a slope portion formed so that the groove depth gradually increases from the edge surface portion 31xr toward the back side.

  In the packing housing groove 31x, many portions of the packing 18 abut on the back surface portion 31xs, the packing 18 is caught on the inclined surface portion on the back side of the edge surface portion 31xr, and the packing 18 escapes from the packing housing groove 31x. Since it prevents it, sealing property can be ensured reliably.

  In this embodiment, the sealing performance can be further improved by using the packing having the cross-sectional shape such as the packings 28 and 38.

[Sixth Embodiment]
Next, a fifth embodiment according to the present invention will be described with reference to FIG. This embodiment has the same configuration as that of the first embodiment except for the cross-sectional shape of the packing receiving groove 41x provided in the watch case 41 and the packing receiving groove 43x provided in the back cover 43. Therefore, only the structure of the joining portion and the cross-sectional shape of the packing are shown, and the description of the other structures is omitted. In FIG. 9, the same reference numerals are given to the portions corresponding to the first embodiment, and the description thereof is omitted.

  In the present embodiment, the packing receiving groove 41x is provided with the same openings 41xa and 41xb as described above, but the inner surface 41xp formed at the back of the opening 41xa is directed from the opening 41xb to the back. It is formed almost horizontally.

  Further, the back cover 43 is provided with a packing receiving groove 43x opposite to the packing receiving groove 41x. The packing receiving groove 43x has an opening 43xa overlapping the opening 41xa and an opening parallel to the opening 41xb. A portion 43xb is provided. The inner surface portion 43xp on the back side of the opening 43xa of the packing housing groove 43x is an inclined surface so that the groove depth gradually increases from the opening 43xb side to the back side.

  In the present embodiment, the height of the packing housing space formed by the packing housing grooves 41x and 43x is configured to be larger on the back side than the openings 41xb and 43xb. 18 can be held, and movement to the inside of the packing 18 and protrusion from the openings 41xb and 43xb can be prevented.

  In this embodiment, the sealing performance can be further improved by using the packing having the cross-sectional shape such as the packings 28 and 38.

  The case body sealing structure and the timepiece of the present invention described above are not limited to the above-described illustrated examples, and various modifications may be made without departing from the scope of the present invention. For example, in each of the embodiments described above, the watch case 11 and the back cover 13 have a sealing structure and also have another sealing structure (a sealing structure between the watch case 11 and the display window 12 or the external operation member 17). Although the inside of the case 11 is completely sealed, in the present invention, the inside of the case body does not need to be completely sealed, and the first case member and the second case member Any material having a sealed structure in at least a part of the space may be used.

  Moreover, in the said embodiment, although the open | release area | region and the closure area | region are provided in the junction part of a timepiece case and a back cover, the packing accommodation groove is opened inside over the perimeter of the said junction part (namely ,. A structure in which the entire circumference is an open region) may be used. In addition, when both the open area and the closed area are provided, the open area can be provided not only in the joint portion in the 3 o'clock -9 o'clock direction and in the 12 o'clock -6 o'clock direction, but in any other part. The closed region can be provided in a portion other than the open region. As described above, the pair of joint portions of the case body facing each other are used as a closed region, and a pair of open regions are provided between the closed regions, so that the packing is securely held even before the case body is assembled. Therefore, it is possible to stabilize the assembled state of the packing and obtain a reliable sealing function.

  Furthermore, in the closed region of the above embodiment, the opening of the packing housing groove 11x is closed by the core portion provided on the back cover, but the packing housing groove may be formed in a concave groove shape in the closed region.

  In addition, the present invention is not limited to any other structure of the above embodiment. For example, in the above embodiment, the watch case and the back cover are fitted and fixed. Any fixing structure such as a screwed structure or a screwed structure can be employed.

The schematic longitudinal cross-sectional view which shows the whole structure of 1st Embodiment. The schematic perspective view which shows the back cover of 1st Embodiment with packing. The expanded partial longitudinal cross-sectional view which shows the junction part (closed area | region) of the timepiece case and back cover of 1st Embodiment with the cross-sectional shape of packing. The expanded partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 1st Embodiment with the cross-sectional shape of packing. The expanded partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 2nd Embodiment with the cross-sectional shape of packing. The expanded partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 3rd Embodiment with the cross-sectional shape of packing. The expanded partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 4th Embodiment with the cross-sectional shape of packing. The enlarged partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 5th Embodiment with the cross-sectional shape of packing. The enlarged partial longitudinal cross-sectional view which shows the junction part (open area | region) of the timepiece case and back cover of 6th Embodiment with the cross-sectional shape of packing. The schematic longitudinal cross-sectional view which shows the structure of the comparative example provided with the packing accommodation groove | channel with constant groove depth.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Clock 11, 21, 31, 41 ... Clock case, 11x, 21x, 31x, 41x, 43x ... Packing accommodation groove, 11xb ... Opening part, 11xp ... Inner surface part, 12 ... Display window, 13, 43 ... Back cover , 13x ... core part, 14 ... internal device, 15 ... display board, 16 ... display means, 17 ... external operation member, 18, 28, 38 ... packing

Claims (8)

In the case body sealing structure in which the first case member and the second case member constituting the case body of the device are joined with the packing interposed therebetween,
At least one of the first case member and the second case member is formed with a packing housing groove having an opening opened inside the case body,
A sealing structure for a case body, wherein the packing housing space constituted by the packing housing groove has a cross-sectional shape in which the height on the opposite side of the opening is larger than the height of the opening.   2. The case body sealing structure according to claim 1, wherein the packing housing groove has an inner surface portion inclined in a direction in which the groove depth increases from the opening side toward the opposite side.   The opening has an open region where the opening is opened inside the case body in a part of the packing housing groove in the extending direction, and the region where the opening is not formed in the remaining portion, or the opening is closed by another member The case body sealing structure according to claim 1, wherein the case body has a closed region.   4. The case body sealing structure according to claim 1, wherein the packing has a cross-sectional shape that is thicker on the outer side than on the inner side without receiving external stress. 5.   The packing has a surface inclined in a direction in which the packing is gradually thickened from the inside toward the outside in a state where it is not subjected to external stress, on the side in contact with the inner surface of the packing housing groove. 4. A sealed structure of the case body according to 4.   The packing has a surface having a convex contour from the inside to the outside in a state in which the packing is not subjected to external stress, on the side in contact with the inner surface of the packing housing groove, and the apex of the surface has the opening. 6. The case body sealing structure according to claim 1, wherein the case body sealing structure is disposed on the back side of the portion and is in contact with an inner surface of a portion having the height larger than the height in the opening. .   A timepiece comprising the case body sealing structure according to any one of claims 1 to 6. 8. The case body sealing structure according to claim 7, wherein the first case member is a watch case, and the second case member is a back cover.

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