JP3487765B2 - Watch case back case - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece having an opening / closing lid on the back side of the timepiece, and more particularly to a rear case of the timepiece having the opening / closing lid. It is. 2. Description of the Related Art Today, clock bodies such as table clocks and wall clocks have a movement in which a wheel train combined with a reduction gear and a step motor are built inside a case of the clock body, and a dial is attached to the case. After the attachment, many of them attach an hour hand and a minute hand to the pointer shaft of the movement. When the step motor is driven, an accurate 0.5 Hz signal is formed by using a crystal oscillation circuit operated by a battery, and the step motor is advanced by the 0.5 Hz signal, whereby an accurate The clock body always displays the appropriate time with hands. Therefore, in these timepieces, as shown in FIG. 6, a hand adjusting knob 75 for adjusting hands is provided on the back surface of the timepiece 10, and a battery housing portion 31 opened on the back side of the timepiece 10 is also provided. The watch body 10 allows the battery to be easily replaced when the battery runs out. [0004] A back cover 61 for covering the battery storage section 31 is attached. Normally, the opening of the battery storage section 31 is closed by the back cover 61 as an opening / closing lid, and the battery storage section 31 is used when the battery is replaced. The part 31 can be opened. In many cases, the back cover 61 is formed separately from a case such as a rear case of the timepiece 10, and is formed of a rectangular flat back cover main body.
The claw portion 65 is protruded laterally from the 63, and a locking protrusion 67 is provided at a position facing the claw portion 65, and this locking protrusion 67 also slightly protrudes from the back cover main body 63 to the side. Things. Accordingly, the back cover 61 serving as the opening / closing cover is provided with a claw portion.
When 65 is hung on the edge of the battery storage portion 31 formed on the back surface of the watch body 10 and the back cover main body portion 63 is pressed strongly so as to match the battery storage portion 31, the locking projection 67 closes the finger hook portion 33. Thus, the battery housing 31 is engaged with the edge of the watch body 10 so as to cover the battery housing 31 and to be fixed to the rear plate of the rear case serving as the back surface of the timepiece 10. [0006] When the battery is to be replaced, the user places the fingertip on the finger hook 33 and applies a force that causes the back cover 61.
The engagement between the locking projection 67 and the edge of the battery housing portion 31 is released, and
Can be easily removed from the rear plate of the rear case, and the battery can be replaced by removing the back cover 61. In addition, the case of the watch body 10 is designed to adjust the appearance of the watch body 10 in combination with a front case for fixing a dial, a middle plate, etc., in addition to a rear case having a flat back plate. Then, the rear case, back cover 61, and the like of the watch body 10 are formed by injection molding of a synthetic resin using a mold. [0007] As described above, since the back cover that can be removed from the back plate such as the rear case is a small plate, when the back cover is removed from the back plate, carelessness may occur. It could be damaged or lost. Therefore, it has been proposed to prevent the back cover from being detached from the case of the watch body. In order to manufacture by molding using a mold, it takes time, cost and expense to mold the mold, and there is a disadvantage that it is not suitable for mass production. The present invention eliminates such disadvantages, provides a mold for a mold, facilitates molding, is suitable for mass production, and provides a case for a watch body having a back cover which is an opening / closing cover which is not lost. Is what you do. SUMMARY OF THE INVENTION The present invention relates to a rear case which forms a case of a timepiece body for fixing a movement by forming a gap between a back plate and a rear end face of a movement for a timepiece. And an opening / closing lid for closing the opening of the back plate. The opening / closing lid has a projection protruding from both sides from the flat plate-shaped main body so that the central axes are aligned, and is centered on the axis of the projection. A projection having a semicircular shape, an engagement recess for engaging with the projection is provided inside the rear plate of the rear case in which the opening is formed, and the projection of the opening / closing lid is provided in the engagement recess. , The peripheral edge of the protruding portion formed on the opening / closing lid serves as a rear case of the timepiece positioned immediately near the rear end face of the movement. [0010] Thus, the rear case of the timepiece provided with the opening / closing lid for closing the opening of the back plate, wherein the projection formed on the opening / closing lid in which the projection is fitted to the engaging recess of the back plate. Since the peripheral edge is located very close to the rear end face of the movement, even if the lid is rotated around the axis of the protrusion to open and close, the protrusion will not come off the engagement recess. To prevent the lid from coming off the rear plate of the rear case. The rear case prevents the opening / closing lid from being detached from the back plate by the movement. Therefore, before the movement is mounted, the protrusion is easily disengaged from the engagement recess. The shape and the shape after which the case can be easily removed from the mold after being molded by the mold can facilitate molding and production of the mold. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rear case of a timepiece body 10 according to the present invention has an opening / closing lid 41 shown in FIG. 1 and a rear case body having an opening 17 corresponding to the opening / closing lid 41 on a back plate 13. 11 is combined with the rear case body 11, and the size of the opening 17 formed in the back plate 13 of the rear case main body 11 is larger than the size of the battery housing portion 31. As shown in FIG. 1, the opening / closing lid 41 has bar-shaped projections 45 protruding outward from both ends of the main body 43 near one end of the main body 43. The two projections 45 are formed so that their central axes coincide. Further, a semicircular plate-shaped projection 47 is provided on one side of the main body 43 that is formed into a straight shape, and the center line of the semicircle of the projection 47 coincides with the axis of the projection 45. Things. The opening / closing lid 41 is provided with a notch 55 for forming a finger hook 33, and a locking member 51 having a claw 53 formed at a tip thereof is protruded inward from the main body 43. I have. Then, after attaching the opening / closing lid 41, the case body 11
Has a cylindrical side wall 15 as shown in FIG.
A rear plate 13 is formed at the rear end of the rear plate 13, and the rear plate 13 has an opening 17 into which an opening / closing lid 41 is fitted. A pair of fixed projections 21 project from the inside of the back plate 13 so as to sandwich the projection 45 of the opening / closing lid 41, and a gap between the two fixed projections 21 is formed. Part engaging recess
23. The engaging recesses 23 are provided on both sides of the opening 17 so that the projections 45 provided on both ends of the opening / closing lid 41 can be inserted and fixed, respectively, as shown in FIGS. As shown in the figure, the both sides are regulated by the fixing projections 21,
The inside of the rear case main body 11 has a shape that opens and opens. Further, a part of the rear plate 13 has a stepped portion recessed inside the rear case body 11 in accordance with the notch 55 of the opening / closing lid 41.
The movement fixing portion 25 for fixing the movement 71 for a timepiece is formed by forming a small gap between the movement 27 and the back plate 13. Accordingly, the projection 45 of the opening / closing lid 41 is aligned with the engagement recess 23 formed inside the back plate 13 and
3, the opening 17 of the back plate 13 is closed by the opening / closing lid 41, and the opening / closing lid 41 is closed by the notch 55 and the step 27, as shown in FIG. Finger hook for opening
33 can be formed. The opening / closing lid 41 and the opening 17 are formed to be larger than the battery accommodating section 31 so that when the opening / closing lid 41 is opened, at least a part of the movement 71 can be seen along with substantially the entire battery. The opening 17 of the opening and closing lid 41
The main body 43 is provided with a through hole 57 for exposing a pointer adjusting knob 75 on the back surface of the timepiece. Then, when attaching the opening / closing lid 41 to the back plate 13 of the rear case main body 11, the projection 45 of the opening / closing lid 41 is positioned inside the back plate 13 so as to pass through the position of the maximum width of the opening 17, When the projection 45 is positioned in the engagement recess 23 formed between the fixed projections 21, the engagement recess 23 has a shape in which both sides are regulated by the fixed projection 21 and is opened inside the rear case body 11. As a result, it is possible to insert the protrusion 45 into the engagement recess 23 very easily. Further, after this, the case main body 11 is
25, the movement 71 can be fixed.
The movement 71 is fixed to the rear case main body 11 so as to form a gap between the movement 13 and the rear end face of the movement 71. The gap is set such that the movement 71 is fixed at a position where the outer periphery of the protrusion 47, which is formed in a semicircular shape around the axis of the projection 45, and the rear end face of the movement 71 are extremely close to each other. It is. Accordingly, as shown in FIG. 5, after the projection 45 of the opening / closing lid 41 is positioned in the engagement recess 23 of the back plate 13 and the movement 71 is fixed to the rear case body 11, the opening / closing lid 41 Move the protrusion 47 close to the rear end face of the movement 71,
Is to come off from the engagement recess 23, the projection 47 comes into contact with the rear end face of the movement 71, and the projection 45 can be prevented from coming off from the engagement recess 23. The protrusion 47 provided on the opening / closing lid 41 has a semicircular shape centered on the axis of the projection 45, that is, the rotation axis of the opening / closing lid 41. Regardless of the angle at which the opening / closing lid 41 is opened, the periphery of the projection 47 is always brought close to the rear end face of the movement 71, and the projection 45 is always prevented from coming off the engagement recess 23. The movement 71 shown in FIGS. 4 and 5 includes a battery fixing portion 79,
When the movement 71 is fixed to the rear case body 11 when the oscillation circuit or the step motor incorporated in the movement 71 is fixed to the rear case body 11, the battery housing 31 is formed by the battery fixing portion 79 to manufacture the timepiece 10. The number of steps is reduced, and the assembly of the clock body 10 is facilitated. As described above, the timepiece according to the present embodiment
The rear case 10 is located on the rear plate 13 of the rear case body 11,
It has an opening 17 that opens the rear of the battery storage section 31 and at least a part of the rear of the movement 71, and a gap is provided between the rear end face of the movement 71 and the back plate 13 to move the movement 71. The case body 11 for fixing the watch body 10 is provided with a flat-shaped opening / closing lid 41 for closing the opening 17, and the opening / closing lid 41 has a projection 45 projecting laterally from both ends of the main body 43. Further, a semicircular projection 47 centered on the axis of both projections 45 is also formed on the opening / closing lid 41, and the periphery of the projection 47 is positioned close to the rear end face of the movement 71, and the projection 45 is placed on the back. This is to be engaged with the engagement recess 23 inside the face plate 13. Therefore, this is a rear case of the watch body 10 provided with the opening / closing lid 41 in which the projection 45 is engaged with the engaging concave portion 23. The opening / closing lid 41 can be opened when replacing a battery or the like. Since the cover 41 does not come off the back plate 13, it is possible to prevent the cover 41 from being lost. The opening / closing lid 41 is moved from the engagement recess 23 by the projection 47 for bringing the peripheral edge close to the rear end face of the movement 71 and coming into contact with the movement 71.
Since the projections 45 of the projections 41 are not disengaged, the engagement recesses 23 are open to the inside of the back plate 13 so that the engagement and disengagement of the projections 45 are free when the movement 71 is not fixed. Can be formed into a shape that can be performed. Therefore, the fixing projection 21 and the engagement recess 23 are
When the rear case body 11 is manufactured by a mold, the shape is such that it can be easily extracted from the mold, and the molding for manufacturing a mold for injecting a resin for molding the rear case body 11 is facilitated. It can be made into a shape suitable for. Incidentally, the side wall 15 of the rear case body 11 is not limited to a cylindrical shape as shown in FIG. 2, but may be a rectangular parallelepiped box shape.
In the case where the shape of the watch body 10 is adjusted to a rectangle larger than the battery housing portion 31 in accordance with the shape of the watch body 10 and has an arc-shaped curved outer shape as shown in FIGS. It is not limited to. The move fixing portion 25 is not only formed on the rear plate 13 but also formed on the side wall 15 and further fixed on the front plate or the middle plate to be combined with the case body 11 thereafter. There is also a case where the movement 71 is fixed to a predetermined position inside the rear case main body 11 by forming a part, the rear end face of the movement 71 fixed to be incorporated inside the rear case main body 11 and the back plate 13 to which the opening / closing lid 41 is attached. It suffices if a timepiece movement 71 is fixed in the rear case body 11 with a gap provided between them. The projections 47 shown in FIG. 1 each have two projections 47 formed so as to be provided near the projections 45, but the axis of the projections 45 is located between the projections 45. In some cases, only one semi-cylindrical projection 47 having the center axis as the center axis is formed. According to the first aspect of the present invention, there is provided an opening / closing lid for closing an opening of a back plate, a projection projecting to both sides from a main body of the opening / closing lid, and both projections are provided. The opening is closed by an opening / closing lid having a semicircular projecting portion centered on the axis, and an engagement recess is provided inside the back plate to engage with the projection. A rear case of the watch body in which, when are combined, the peripheral edge of the projection formed on the opening / closing lid is located immediately adjacent to the rear end face of the movement having a gap between the opening and the back plate. Therefore, the opening / closing lid is prevented from coming off the back plate of the rear case body due to the contact between the movement and the protruding portion, and a timepiece case without losing the opening / closing lid can be provided. In addition, since the rear case can be formed on the back plate with an engagement recess for easily opening and closing the lid when the movement is not attached, the rear case for a watch suitable for mass production with easy mold manufacturing. is there.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of an opening / closing lid attached to a rear case body of a timepiece according to the present invention. FIG. 2 is a perspective view showing an example of a rear case body of the timepiece according to the present invention. FIG. 3 is a back view showing an example of a rear case of the timepiece according to the present invention. FIG. 4 is an exploded side view showing an example of a rear case of the watch body according to the present invention. FIG. 5 is a side sectional view showing an example of a rear case of the timepiece according to the present invention. FIG. 6 is a rear view showing an example of a conventional watch body. [Description of Signs] 10 Watch body 11 Rear case body 13 Back plate 15 Side wall 17 Opening 21 Fixing protrusion 23 Engagement recess 25 Move fixing part 27 Step part 31 Battery storage part 33 Finger hook part 41 Opening / closing lid 43 Opening / closing lid main body 45 Projection 47 Projection 51 Locking body 53 Claw 55 Notch 57 Through hole 61 Back cover 63 Back cover body 65 Claw 67 Locking projection 71 Movement 75 Pointer adjustment knob 79 Battery fixing

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G04B 37/22 G04B 37/20 G04B 37/14

Claims (1)

(57) [Claim 1] A rear case forming a case of a watch body for fixing a movement by forming a gap between the back plate and a rear end surface of the movement for a watch, Opening / closing lid for closing the opening, the opening / closing lid has projections that are aligned on the center axis and protrude from both sides from the flat plate-shaped main body, and are half-centered about the center axis of both projections. It has a circular protruding portion, and has an engaging concave portion that engages with the protruding body inside the back plate of the rear case where the opening is formed. A rear case of the timepiece, wherein a peripheral edge of the protruding portion formed on the opening / closing lid is located immediately near a rear end face of the movement when combined.