JP2523889Y2 - clock - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece, and more particularly to a timepiece having a dial held in a fixed position.

2. Description of the Related Art Conventionally, a watch case structure in which a projection for guiding the outer shape of a dial is provided on a middle frame so that a watch case and a dial can be positioned has been proposed in Japanese Utility Model Laid-Open No. 62-180791.

The one described in Japanese Utility Model Laid-Open Publication No.
As shown in the drawing, a dial positioning protrusion 105a is provided on a middle frame 105 in which the movement 102 is fitted, and an inner peripheral surface of the dial positioning protrusion 105a of the middle frame 105 is a dial supporting surface 105b, and the middle frame 105 Dial support surface 105b of the dial positioning protrusion 105a
To the end of dial 103, watch case 101 and dial
The positioning of 103 was performed.

Moreover, the dial positioning projection 105a provided on the middle frame 105
Functions as a fixing member for preventing the dial 103 from being displaced by an impact applied to the timepiece.
Hour and 6 o'clock positions, and at 3 o'clock and 9 o'clock positions of the middle frame 105 perpendicular thereto, the dial positioning protrusions 105a of the middle frame 105 are arranged in a direction orthogonal to each other.
3 is sandwiched and held.

On the other hand, as a problem in the design of the timepiece, for example, a small second is arranged separately from the center of the dial, or a chronograph hand, date and day of the week, moon face, etc. are arranged along the outer periphery of the dial. If
In order to ensure the visibility of these additional devices, it is strongly desired to increase the parting diameter, which is the visible region of the dial.

However, in the conventional method in which the end of the dial 103 is fixed by the dial positioning projections 105a provided on the middle frame 105 shown in FIG. 6, in order to form the dial positioning projections 105a on the middle frame 105, a watch is required. Inner peripheral surface 101a of case 101 and dial 103
It is necessary to provide a clearance C (see FIG. 6) between them, and the size of the dial 103 with respect to the watch case 101 is limited. It was difficult to increase only the diameter V (see FIG. 6) according to the design of the timepiece.

In the conventional system shown in FIG.
In order to prevent misalignment of the watch case 101 with respect to the watch case 101, it is necessary to dispose the dial positioning protrusions 105a at least at the 3 o'clock position and the 9 o'clock position of the middle frame 105 (generally at 12 o'clock and 6 o'clock of the watch case 101). There is a band at the position of, and it is difficult to receive a strong impact). Therefore, the parting diameter of the dial 103 cannot be expanded to the vicinity of the inner peripheral surface 101a of the watch case 101, and it is 3 to 9 o'clock of the dial 103. The direction cut-off diameter is necessarily small, and it is difficult to arrange the additional device as described above in this position, and various constraints are imposed on the design of the timepiece.

On the other hand, in order to secure the parting diameter of the dial 103 in the direction of 3 o'clock to 9 o'clock, the dial positioning projections 105a at the 3 o'clock and 6 o'clock positions of the middle frame 105 are removed, and the dial 103 is replaced with a watch case. 1
When extending to the vicinity of the inner peripheral surface 101a of 01, the dial 10
In order to accurately position the dial 103 with respect to the watch case 101 in addition to directly positioning the dial 3 by the inner circumferential surface 101a of the watch case 101, the inner circumferential surface 101 of the watch case 101 is required.
The roundness of the corner 106 of a must be less than 1/10 mm at the maximum, and in order to maintain the positioning accuracy of the dial 103, it is necessary to frequently change the processing tool when processing the watch case 101 side, and the production cost of the watch There is a problem that soaring.

In addition, the dial is indirectly moved by press-fitting the dial with a step that contacts the dial outer circumference or the whole circumference or several places at the upper part of the flange outer edge that protrudes from the upper surface of the middle frame that supports the movement. The structure of a watch center frame to be fixed to a vehicle is proposed in Japanese Utility Model Laid-Open No. 52-26573.

However, Japanese Unexamined Utility Model Publication No. 52-26573 has a step formed on the outer periphery of the upper surface of the middle frame, and furthermore, in order to stably fix the dial, even if a step is formed partially. Even if it does, it is necessary to make the step part contact the outer peripheral surface of the dial with a certain area or more, and to form it at each end in two directions crossing each other, so instead of increasing the parting diameter of the dial There is a risk of making it smaller. Also, even when the dial and the step are fitted unevenly,
The notch and the projection formed on the dial and the stepped portion and engaged with each other are formed in a semicircular shape, so if an excessive load is applied to the middle frame or the dial, the engagement is released and the dial may be displaced. There is.

Furthermore, an engagement portion is provided on one of the dial and the holding spring,
No. 61-6784 discloses that the dial is mounted at a fixed position by providing a projection on the other side to engage with the engagement portion and engaging the engagement portion with the projection. It has been proposed as a gazette.

However, in the case of Japanese Utility Model Laid-Open No. 61-6784, the presser spring is mounted in a compressed state between the outer peripheral portion of the dial and the hook of the frame, and is provided on one of the dial and the presser spring. The engaging portion is engaged with the protrusion provided on the other side, the protrusion of the holding spring is hooked on the hook of the frame, and the outer peripheral portion of the dial is pressed against the packing by the elastic force of the holding spring. When an external impact is applied to the frame, the pressing spring is elastically bent by the impact, and the dial may rotate with respect to the frame together with the pressing spring.

Problems to be Solved by the Invention The purpose of the present invention is to address the above-mentioned problems and to engage the concave engagement portions of the dial with the engagement projections of the dial mounting surface of the middle frame, respectively. The facing surface and both side surfaces of the engaging projections of the middle frame engage with the concave engaging portions of the dial, and the dial is arranged on the middle frame in the direction in which these engaging projections are arranged, and in a direction perpendicular to this. The dial is securely positioned and fixed, and no matter what direction the shock is applied, the dial does not shift with respect to the watch case. The opposing surface and both side surfaces of the engagement protrusion of the frame and the concave engagement portion of the dial are hardly disengaged because they are engaged with each other, and the dial is extremely firmly positioned and fixed with respect to the middle frame. Not only does it matter in which direction it is installed, but it does not require other positioning means such as steps, The arrangement direction of the engagement protrusion is selected according to the direction in which the diameter should be secured, and the parting diameter of the dial in a direction substantially orthogonal to the arrangement direction of the engagement protrusion of the middle frame is set near the inner peripheral surface of the watch case. Without increasing the inside diameter of the watch case itself, ensuring the necessary dial cutoff diameter according to the design of the watch case, greatly improving the freedom of watch design, and placing the dial inside the watch case. Unlike the conventional method, which secures the parting diameter of the dial by directly positioning it on the peripheral surface, there is no need to sharpen the corners of the inner peripheral surface of the watch case in order to obtain the positioning accuracy of the dial, An object of the present invention is to provide a timepiece that does not require frequent replacement of tools when working on the watch case side, facilitates working on the watch case side, and can reduce the manufacturing cost of the watch case.

Means for Solving the ProblemsThe clock of the present invention, in order to achieve the above object, arranges a middle frame in the watch case, and arranges a dial above the dial mounting surface of the middle frame, Only a pair of mutually opposing parallel opposite ends of the dial mounting surface of the middle frame are formed with upwardly projecting rectangular engaging projections protruding upward, respectively, and a pair of parallel opposite ends of the dial facing each other. Only the concave engaging portions of a rectangular shape in a plan view that engage with the opposing surface and both side surfaces of the engaging protrusions of the middle frame are respectively formed, and the concave engaging portions of the dial are respectively formed on the engaging protrusions of the middle frame. The dial has a configuration in which a parting diameter of the dial in a direction substantially perpendicular to a direction in which the engagement protrusions of the middle frame are arranged is extended to a position near an inner peripheral surface of the timepiece case.

For example, when securing a parting diameter in the direction of 3 o'clock to 9 o'clock on the dial, rectangular projections in plan view are formed at 12 o'clock and 6 o'clock on the dial mounting surface of the middle frame, respectively.
At the 12 o'clock and 6 o'clock positions of the dial, rectangular recessed engaging portions are formed at the 12 o'clock and 6 o'clock positions, which engage the opposing surface and both side surfaces of the engaging protrusion of the middle frame, and the engaging protrusion of the middle frame and the The concave engaging portion is configured to be fitted into the concave and convex portions.

An upwardly protruding rectangular engaging projection formed only at opposite ends of the dial mounting surface of the middle frame and a rectangular engaging recess formed only at opposing opposite ends of the dial. By engaging the concave and convex portions with each other, the opposing surface and both side surfaces of the engaging protrusion of the middle frame engage with the concave engaging portion of the dial, and the arrangement direction of these engaging protrusions and the orthogonal direction. In this direction, the dial is positioned and fixed to the middle frame.

For example, the engaging projections formed at the 12 o'clock and 6 o'clock positions of the dial mounting surface of the middle frame and the concave engaging portions formed at the 12 o'clock and 6 o'clock positions of the dial are uneven. When fitted, the opposing surface and both side surfaces of the engaging protrusions of the middle frame engage with the concave engaging portions of the dial, and the 12: 00-6 o'clock direction, which is the disposing direction of these engaging protrusions, and The dial is positioned and fixed with respect to the middle frame in the 3 o'clock-9 o'clock direction orthogonal to this, and the dial of the dial without the engagement protrusion of the middle frame is formed.
The parting diameter in the hour-9 o'clock direction can be increased to near the inner peripheral surface of the watch case.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

The present embodiment shows a case where the parting diameter of the dial of the timepiece in the direction of 3 o'clock to 9 o'clock is secured.

FIG. 1 shows a middle frame of the timepiece of the present embodiment (hereinafter referred to as a middle frame).
In the plan view of FIG. 1, only the 12 o'clock and 6 o'clock positions, which are a pair of mutually opposing parallel opposite ends of the dial mounting surface 2 of the middle frame 1, are engaged with rectangular projections projecting upward in plan view. Protrusions 3 and 4 are formed respectively.

As shown in FIG. 1, a set space 5 for fitting a movement (not shown) is provided at a substantially central portion of the middle frame 1 made of an elastic material such as a synthetic resin.
At appropriate positions on both end faces and both side faces of the watch case, a plurality of fitting projections that fit with the inner peripheral surface 15 of the watch case 12 to position the middle frame 1 and absorb shock, vibration, etc. from the watch case 12 are provided. 6
Are provided respectively.

In addition, since the four corners of the inner frame 1 are formed into chamfered shapes, the processing of the corners 18 on the inner peripheral surface 15 of the watch case 12 to be fitted thereto can use rough tolerances in size and shape. .

At the 9 o'clock position near the center of one side of the middle frame 1, a notch 7 is formed as shown in FIG.
An extension rod (not shown) extending from the crown mounted on the middle frame 1 is made to penetrate through the cutout 7 of the middle frame 1, and then connected to the movement fitted in the set space 5 of the middle frame 1.

FIG. 2 is a plan view showing the dial 8 mounted on the dial mounting surface 2 of the middle frame 1 at 12:00 and 6 o'clock, which is a pair of opposed opposite ends of the dial 8. Only in the position of
Recessed engagement portions 9 and 10 each having a rectangular shape in plan view are formed to engage with the opposing surfaces and both side surfaces of the engagement protrusions 3 and 4 of the middle frame 1. A hole 11 for penetrating a needle shaft (not shown) from a movement internally fitted in the set space 5 is formed.

As shown by a dashed line in FIG. 1, the dial 8 is formed slightly smaller than the maximum outer diameter of the middle frame 1 including the fitting projection 6 and is located above the dial mounting surface 2 of the middle frame 1. The concave engaging portions 9 and 10 of the dial 8 are fitted into the engaging projections 3 and 4 of the middle frame 1 with the concave and convex, respectively, so that the facing surfaces and both side surfaces of the engaging projections 3 and 4 of the middle frame 1 are The engaging projections 9 and 10 of the dial 8 are engaged with the concave engaging sections 9 and 10, respectively, in the 12: 00-6 o'clock direction, which is the disposing direction of the engaging projections 3, 4, and in the 3-0-9 o'clock direction orthogonal thereto. The dial 8 is positioned and fixed to the middle frame 1 (see FIG. 1).

That is, the dial 8 is formed on the middle frame 1 by the opposing surfaces of the rectangular engaging projections 3 and 4 arranged to sandwich the rectangular concave engaging portions 9 and 10 of the dial 8. And the engaging projections 3 in a rectangular shape in plan view, which are positioned and fixed in the direction of 12 o'clock to 6 o'clock, and are fitted into the concave engaging portions 9 and 10 of the dial 8 in concave and convex shapes in plan view.
4 are positioned and fixed in the 3 o'clock to 9 o'clock direction with respect to the middle frame 1 by both side surfaces.

FIG. 3 is a plan view showing a quarter of the timepiece with the middle frame 1 and the back cover 13 assembled to the timepiece case 12, and FIG. Case 12, medium frame 1,
12 o'clock with the back cover 13, dial 8, and windshield 14 attached
It is a figure which shows the cross section of a 6 o'clock direction.

As shown in FIG. 5, the watch case 12 is provided with a middle frame 1, and a dial 8 is provided above the dial mounting surface 2 of the middle frame 1.

As shown in FIG. 5, the middle frame 1 is connected to the watch case 12 via a plurality of fitting projections 6 provided on both end surfaces and both side surfaces thereof.
The outer peripheral portion of the lower surface 16 of the middle frame 1 is pressed by the tip of an engaging piece 17 fixed to the back cover 13 to be fixed to the watch case 12. .

The four corners of the middle frame 1 are chamfered, and the corners 18 of the inner peripheral surface 15 of the watch case 12 may have a suitable curved shape as shown in FIG.

FIG. 4 is a view showing a cross section in the direction of 3 o'clock to 9 o'clock in a state where the middle frame 1, the back cover 13, the dial 8, and the windshield 14 are assembled to the watch case 12, and the engagement protrusion of the middle frame 1 is shown. the inner peripheral surface panel cover diameter V _X direction dial 8 of the watch case 12 to the laying direction substantially perpendicular to 3,4
A clearance C ′ is provided between the inner peripheral surface 15 of the watch case 12 and the side edge of the dial 8.

In this embodiment, the engagement projections 3 and 4 for preventing the dial 8 from being displaced with respect to the watch case 12 are arranged at the 3 o'clock and 9 o'clock positions on the dial mounting surface 2 of the middle frame 1. No need, the diameter of the dial 8 in the 3 o'clock-9 o'clock direction is a watch case
Can be extended to such an extent that contact with the inner circumferential surface 15 of 12, without increasing the inner diameter of the watch case 12 itself, to ensure a large panel cover diameter V _X o'clock 3 o'clock -9 direction of dial 8 Can be.

Further, in the conventional example as shown in FIG. 6, in order to secure a parting diameter V of the dial 103 in the 3 o'clock and 9 o'clock direction, the dial for positioning the dial at the 3 o'clock and 6 o'clock positions of the middle frame 105 is used. Unlike the conventional method of removing the protrusion 105a, extending the dial 103 to near the inner peripheral surface 101a of the watch case 101, and positioning the dial 103 directly with respect to the inner peripheral surface 101a of the watch case 101,
In this embodiment, in order to obtain the positioning accuracy of the dial 8,
It is not necessary to sharpen the corner 19 of the inner peripheral surface 15 of the watch case 12, and it is not necessary to frequently change tools when working the watch case 12, so that the manufacturing cost of the watch can be kept low.

The clearance C 'shown in FIG. 4 is only a small clearance provided for preventing interference between the side edge of the dial 8 and the corner 19 of the inner peripheral surface 15 of the watch case 12, and is not limited to the sixth clearance. The size is completely different from the clearance C shown in the figure.

Having described an example of a case to secure a large panel cover diameter V _X o'clock 3 o'clock -9 direction of the dial 8 of the watch,
As long as the purpose of preventing the displacement of the dial 8 with respect to the watch case 12 is not limited to the 12 o'clock and 6 o'clock positions of the engaging projections 3 and 4 of the middle frame 1, It may be provided anywhere as long as it is a pair of opposite ends of the board mounting surface 2, and no matter where the engagement protrusions 3, 4 of the middle frame 1 are provided, these engagement protrusions may be provided. The dial 8 is securely positioned and fixed with respect to the middle frame 1 in the arrangement direction of 3, 4 and the direction orthogonal thereto, and the movement of the dial 8 with respect to the middle frame 1 is completely restrained. Even if a shock is applied from such a direction, the watch case is attached to the dial 8.
No misalignment with respect to 12 occurs.

Therefore, by disposing the engaging projection 3 and 4 of the inner frame 1 in a direction substantially orthogonal to the direction to be secured parting diameter V _X of the dial 8, the required dial according to the design of the watch it is possible to secure the panel cover diameter V _X 8, positional deviation of the watch case 12 of the dial 8 is prevented.

Effects of the Invention As described above, according to the timepiece of the present invention, the concave engagement portions of the dial are fitted into the engagement protrusions of the dial mounting surface of the middle frame, so that the engagement of the middle frame can be improved. Since the opposing surface and both side surfaces of the engaging projections engage with the concave engaging portions of the dial, the dial can be securely attached to the middle frame in the direction in which these engaging projections are arranged and in a direction perpendicular to the direction. The dial can be positioned and fixed in any direction, no matter what direction the shock is applied, the dial will not be displaced with respect to the watch case, and even if a large shock is applied, Since the opposing surface and both side surfaces of the engagement protrusion of the frame and the concave engagement portion of the dial are hardly disengaged from each other, the dial can be extremely firmly positioned and fixed with respect to the middle frame. It does not matter which direction the mating projections are arranged, and no other positioning means such as steps are required Therefore, the arrangement direction of the engagement protrusions can be selected according to the direction in which the dial diameter of the dial should be secured, and the dial diameter of the dial in a direction substantially orthogonal to the arrangement direction of the engagement protrusions of the middle frame. Has been extended to the vicinity of the inner peripheral surface of the watch case, so that the necessary dial diameter of the dial can be secured according to the design of the watch case without increasing the inner diameter of the watch case itself. The degree is greatly improved.

Also, unlike the conventional method that secures the parting diameter of the dial by directly positioning the dial with respect to the inner peripheral surface of the watch case, in order to increase the positioning accuracy of the dial, the corner of the inner peripheral surface of the watch case is It is not necessary to process the watch case sharply, and it is not necessary to frequently change tools when processing the watch case side.
The production cost of the timepiece can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing a middle frame of a timepiece according to an embodiment of the present invention, FIG. 2 is a plan view showing a dial placed on the middle frame of the timepiece, and FIG. FIG. 4 is a plan view showing a quarter of the timepiece in a see-through manner with the frame and back cover assembled. FIG. 4 shows a timepiece with a middle frame, a case back, a dial, and a windshield attached to a watch case. Fig. 5 shows a cross section at 9 o'clock, and Fig. 5 shows a cross section at 12 o'clock-6 o'clock with the side frame of the watch case 12, the middle frame, back cover, dial and windshield attached to the watch case. FIG. 6 is a sectional view of a main part showing a conventional watch case structure. DESCRIPTION OF SYMBOLS 1 ... Middle frame, 2 ... Dial mounting surface, 3, 4 ... Engagement protrusion, 5 ... Set space, 6 ... Fitting protrusion, 7 ... Notch, 8 ... Dial, 9, 10 ... Concave engagement Part, 11 ... hole, 12 ... watch case, 13 ...
Back cover, 14 ... windshield, 15 ... inner circumferential surface, 16 ... bottom surface, 17 ... engaging pieces, 18 ... Corner, 19 ... corner panel cover diameter of V _X ... 3 o'clock -9 o'clock, C '... clearance, 101… Watch case, 101a… Inner surface, 102… Movement, 103… Dial,
105: middle frame, 105a: dial positioning protrusion, 105b: dial support surface, 106: corner, C: clearance, V: parting diameter.

Claims (1)

(57) [Scope of request for utility model registration] An inner frame is disposed on a timepiece case, and a dial is disposed on an upper surface of a dial mounting surface of the inner frame. Only a pair of both end portions are formed with engagement protrusions of a rectangular shape in a plan view projecting upward, and only the pair of parallel opposite end portions of the dial facing each other, the opposing surfaces and the side surfaces of the engagement protrusions of the middle frame. The concave engaging portions of a rectangular shape in a plan view are formed respectively, and the concave engaging portions of the dial are fitted to the engaging protrusions of the middle frame, respectively, and the arrangement direction of the engaging protrusions of the middle frame is formed. A timepiece, wherein a parting diameter of the dial in a direction substantially perpendicular to the direction is extended to near an inner peripheral surface of the timepiece case.