JP5104498B2 - Middle frame and clock - Google Patents

Description

The present invention relates to a middle frame that holds a movement of a timepiece, and a timepiece including the middle frame.

2. Description of the Related Art Conventionally, there is known a timepiece that houses a movement provided with time display means inside a cylindrical case (see, for example, Patent Document 1).
The one described in Patent Document 1 is an electronically driven timepiece that accommodates a movement in which each pointer is driven by electric power provided from a battery inside an exterior case.

By the way, in the timepiece as described in Patent Document 1, if the movement is charged with, for example, static electricity, the electronic control component may be adversely affected. For this reason,
Generally, a conduction spring that protrudes to the outer diameter side is provided in a part of the movement, and this conduction spring
The structure which conduct | electrically_connects between an exterior case and a movement is taken.

JP 05-52970 A

However, when the movement from which the conduction spring protrudes is housed in the exterior case, the amount of deflection of the conduction spring varies depending on the inner diameter of the exterior case. As a result, for example, when the inner diameter dimension of the outer case is small, it is necessary to bend the conduction spring more. Therefore, when the movement is stored in the outer case, a large force is required and the assembly work becomes complicated. There is. Further, when the inner diameter of the outer case is too large, the contact pressure of the conductive spring with respect to the outer case becomes small, and even if it is grounded, the contact pressure necessary for electrical continuity cannot be secured and becomes non-conductive. There's a problem. Furthermore, for example, the conduction spring may be separated from the outer case due to an impact or the like. In this case, there is a problem that the movement cannot be grounded.

In view of the above problems, an object of the present invention is to provide an inner frame that facilitates storage of a movement in a case, and a timepiece including the inner frame.

The inner frame of the present invention has a time display means, holds the outer peripheral portion of the movement from which the elastic member for conduction projects in the outer diameter direction, and is housed in a predetermined position of the metal case together with the movement. In the state where the movement and the middle frame are removed from the case, the elastic member is in a state in which a distal end portion of the elastic member protrudes in a radial direction by a predetermined dimension from an inner diameter dimension of the case. It is characterized by comprising an elastic member restricting part for restricting the projecting direction of.

According to the present invention, the elastic member restricting portion of the inner frame restricts the distal end portion of the elastic member to protrude from the case inner diameter by a predetermined dimension with the movement removed from the case. That is, when the movement member is housed in the case, the elastic member restricting portion positions the elastic member fixed to the movement so that the bending amount of the elastic member becomes a predetermined amount. For example, in a timepiece having a case with a small inner diameter, the inner frame positions the elastic member so that it protrudes to the outer diameter side by a predetermined amount from the inner diameter of the case.
Accordingly, when the movement is attached to the case, the amount of bending of the elastic member can be set to the predetermined amount, and the movement can be easily attached to the case.
That is, for example, when a movement in which the protruding angle of the elastic member is set corresponding to a case with a large inner diameter is stored in a case with a small inner diameter, the elastic member needs to be bent more when the movement is stored. On the other hand, in the present invention, the inner frame is formed by the elastic member restricting portion.
The elastic member is pressed toward the movement side and positioned so that the projecting dimension toward the case side becomes a predetermined value set in advance. Here, the middle frame positions the elastic member so that the amount of bending of the elastic member is smaller than the case where the middle frame is not provided when the movement is stored in the case. . Thus, the movement can be easily accommodated in the case simply by bending the elastic member by the predetermined amount of deflection, and the assembling work for accommodating the movement in the case can be easily performed.
On the other hand, for example, when using a movement in which the protruding angle of the elastic member is set with respect to a case having a small inner diameter, the inner frame is positioned by pressing the elastic member to the outer diameter side than usual by the elastic member restricting portion. . Here, the middle frame positions the elastic member so that the bending amount of the elastic member becomes a predetermined bending amount when the movement is stored in the case. As a result, the movement can be easily accommodated in the case simply by bending the elastic member by the predetermined amount of deflection, and the assembly workability is improved.
Therefore, by selecting an appropriate middle frame according to the inner diameter of the case to which the movement is attached, the amount of bending of the elastic member can be made constant regardless of the inner diameter of the case, and the elastic member can be bent with substantially the same stress. The movement can be easily attached to the case simply by pushing. In addition, it is possible to deal with a case in which the inner diameter size is different with one elastic member, and it is possible to share parts, thereby reducing the cost of the product.

Further, in the inner frame of the present invention, the elastic member restricting portion is a protruding portion that abuts on the movement side of the elastic member and pushes out at a predetermined angle with respect to the tangential direction of the outer peripheral edge of the movement. Preferably there is.
If it is such a protrusion part, it can form easily only by forming an inner frame by injection molding, or processing a part of inner frame, for example. Moreover, the structure which positions an elastic member easily in an appropriate position with respect to a case internal diameter is obtained by adjusting the angle with respect to the case of this protrusion part, and the position formed.

Furthermore, in the middle frame of the present invention, it is preferable that the projecting portion is formed with a tapered surface that pushes the elastic member toward the projecting direction when the middle frame is attached to the movement.
Here, as an inclination direction of the taper surface, for example, when the elastic member is pushed out and positioned by the protruding portion, the taper is inclined from the outer diameter side to the inner diameter side of the movement toward the distal end portion of the protruding portion. For example, when the elastic member is pushed inward in the radial direction by the projecting portion and positioned, if a tapered surface that is inclined from the inner diameter side of the movement toward the outer diameter side is formed toward the tip end portion of the projecting portion, Good.
According to this invention, when the elastic member fixed to the movement is positioned by the protruding portion, the elastic member can be slid on the tapered surface and bent. Therefore, when attaching the middle frame to the movement, the position adjustment of the elastic member can be easily performed, and the working efficiency can be improved.

The timepiece according to the present invention is a metal case, a movement housed in the case, and having a time display means for displaying the time, and a conduction for projecting from the outer periphery of the movement in the outer diameter direction The elastic member, and an inner frame that holds the outer periphery of the movement and is housed inside the case together with the movement, wherein the inner frame places the movement inside the case. An elastic member restricting portion for restricting the protruding direction of the elastic member is provided in a state where the elastic member is bent by a predetermined amount of deflection when stored.
According to this invention, similarly to the above-described invention, the elastic member is positioned by the elastic member restricting portion of the middle frame so that the bending amount when the elastic member is attached to the case becomes a predetermined value. Therefore, when the movement is mounted on the case, the elastic member can be easily brought into contact with the inner peripheral surface of the case by bending the predetermined amount of deflection, and the efficiency of the assembly work can be improved.

Alternatively, in the timepiece of the invention, the case is formed in a substantially cylindrical shape, and the movement is
The elastic member is housed inside the case cylinder in a state where the elastic member is bent toward the cylinder central axis side of the case, and the distal end portion of the elastic member moves the movement from the distal end side toward the proximal end side. It is preferable to be formed in a tapered shape that is inclined in the direction in which it is housed.
According to the present invention, when the movement is housed in the case, since the tapered surface of the distal end portion of the elastic member abuts on the inner peripheral portion of the case, the distal end portion of the elastic member is moved along the tapered surface. It becomes easy to bend the elastic member. Therefore, it is possible to improve the working efficiency when housed in the case of the movement. Further, as described above, since the amount of bending of the elastic member when the movement is housed in the case is constant, the distance dimension of the tapered surface can be set short, and the elastic member can be downsized. .

Hereinafter, a timepiece according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view showing an outline of a timepiece according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the timepiece disassembled into a case, a movement, and an inner frame.
FIG. 3 is an enlarged plan view of the vicinity of a conduction spring as an elastic member in a timepiece having a body portion having a small inner diameter.

[Clock configuration]
In FIG. 1, reference numeral 1 denotes a timepiece. The timepiece 1 includes a movement 20 having a time display means constituted by hands 21 and driving means for driving the hands 21, and an intermediate frame 30 for holding the movement 20. And a case 1 for storing the inner frame 30 and the movement 20.
0.
And the case 10 is opposite to the side where the windshield glass 12 of the substantially cylindrical body part 11, the windshield glass 12, the cyclic | annular glass edge 13 holding the peripheral part of the windshield glass 12, and the trunk part 11 is provided. And a back cover 14 provided on the side.

The body part 11 constituting the case 10 is formed of a metal such as titanium or stainless steel, for example. The trunk portion 11 is formed by, for example, three-dimensional cutting / polishing, and includes a movement fixing portion (not shown), an edge fixing portion 111, and a back lid fixing portion 112.
The movement fixing portion positions the body portion 11 and the movement 20 on the same axis and fixes the movement 20. The edge fixing part 111 fixes the glass edge 13 holding the windshield 12 to the body part 11. Further, the back cover fixing part 112 fixes the back cover 14 to the body part 11. In addition, as a fixing method of the movement 20, the glass edge 13, and the back cover 14 in these fixing | fixed parts, various fixing methods, such as screwing and adhesive fixing, can be used, for example.
Further, the movement 20 fixed by the movement fixing part is disposed with a gap of a predetermined dimension with respect to the inner peripheral surface of the body part 11.

As described above, the movement 20 includes the pointer 21, the driving mechanism (not shown) that drives the pointer 21, the dial 22, and the like.
The drive mechanism includes a drive wheel train (not shown), a step motor, an electronic circuit unit, a battery for supplying electric power, and the like. In this movement 20, the electric power supplied from the battery is supplied to the electronic circuit unit, and the electronic circuit unit controls the driving of the step motor to generate a predetermined driving force. Then, this driving force is transmitted to the pointer 21 via the driving wheel train, and the pointer 21 is driven at a predetermined driving interval. The timepiece 1 of the present embodiment is an electronic timepiece that drives the hands 21 with battery power. For example, the timepiece 1 is a timepiece that generates power by the driving force of the mainspring to perform speed control, a mechanical timepiece, or the like. May be.

Further, the movement 20 has the above-described battery, at least in the vicinity of the outer peripheral edge on the back cover 14 side,
An earth substrate 23 is provided which is electrically connected to earth terminals in various electronic components such as an electronic circuit unit and a step motor.
The ground substrate 23 is formed of a conductive metal member. Further, at least a part of the earth substrate 23 is provided along the outer peripheral edge of the movement 20. The ground substrate 23 is electrically connected to a ground terminal (not shown) of various electronic components arranged on the movement 20.

The ground substrate 23 includes a spring forming piece 231 that is bent along the outer peripheral edge of the movement 20, and the spring forming piece 231 has an elasticity that protrudes toward the inner peripheral surface of the body portion 11 of the case 10. A conduction spring 24 as a member is formed.
Here, the conduction spring 24 is set in an approximately tangential direction of the movement 20 as an initial state (indicated by a two-dot chain line in FIG. 3), and the tangent of the movement 20 from this state by the middle frame 30 described later. Are bent into a positioning state bent by a predetermined angle (a state indicated by a one-dot chain line in FIG. 3). And when this movement spring 24 is accommodated in the trunk | drum 11, when this movement 20 is accommodated in the trunk | drum 11, it will be bent by predetermined amount of deflection (alpha) (for example, 50 mm) from this positioning state state (state shown with a dashed-dotted line in FIG. 3). The body portion 1 of the case 10 is elastically deformed to the state of being
1 is in contact with the inner peripheral surface at a predetermined contact pressure.

Here, based on FIG. 4, the shape of the front-end | tip part of the conduction | electrical_connection spring 24 is demonstrated. FIG. 4 is a diagram showing the shape of the tip of the conduction spring 24.
In FIG. 4, a tapered portion 241 that is inclined from the windshield 12 side toward the back cover 14 side is formed at the distal end portion of the conduction spring 24 from the proximal end side toward the distal end side. The taper portion 241 assists the elastic deformation of the conduction spring 24 when the movement 20 is housed in the body portion 11. That is, when the movement 20 is pushed into the body portion 11 with the taper portion 241 in contact with the end portion of the inner peripheral surface of the body portion 11, the taper surface is pushed in by the end portion of the inner peripheral surface of the body portion 11. It is. As a result, the axial force that pushes the movement 20 can be converted into a radial force that bends the conduction spring 24, and the conduction spring 24 can be easily bent toward the movement 20.

The middle frame 30 is a synthetic resin member formed in a substantially cylindrical shape, and is molded by, for example, injection molding. The middle frame 30 is disposed between the movement 20 and the body portion 11 with the outer peripheral surface of the movement 20 held by the inner peripheral surface of the cylinder. At this time, the outer peripheral shape of the middle frame 30 is formed so that a gap of a predetermined dimension is provided between the inner frame 30 and the inner peripheral surface of the trunk portion 11.
Further, the middle frame 30 has a pressing piece 31 that faces the back cover 14 of the movement 20, and a protruding portion 32 as an elastic member regulating portion as shown in FIG. Yes. The protruding portion 32 is positioned at a position where the conducting spring 24 is brought into contact with the surface facing the body portion 11 and bent at a predetermined angle with respect to the tangential direction of the movement 20. More specifically, when the movement 20 is housed in the body portion 11, the protruding portion 32 is bent by a predetermined bending amount α by the conduction spring 24 being pushed into the inner peripheral surface of the body portion 11. Position it.

FIG. 5 is an enlarged cross-sectional view of the vicinity of the conduction spring, (A) is a diagram showing a state before the middle frame is attached to the movement, and (B) is a diagram showing a state where the middle frame is attached to the movement. .
As shown in FIG. 5, a tapered surface 33 is formed at the tip of the protruding portion 32 so as to incline from the windshield 12 side toward the back cover 14 side in the outer diameter direction. By providing such a tapered surface 33, when the movement 20 is mounted on the inner frame 30, the tapered surface 33 is provided.
The conduction spring 24 can be guided in the radially outward direction along the taper, and positioning of the conduction spring 24 is facilitated.

The middle frame 30 is formed with a spring insertion window 34 by cutting away the vicinity of the formation portion of the protruding portion 32 on the circumferential surface facing the body portion 11. The conduction spring 24 is inserted into the spring insertion window 34, and the leading end portion between the conduction springs protrudes from the outer peripheral surface of the middle frame 30 toward the body portion 11.

[How to assemble the watch]
Next, an assembling method in which the movement 20 is attached to the case 10 and assembled in the timepiece 1 as described above will be described.
In assembling the timepiece 1, first, the inner frame 30 is attached to the movement 20.
Here, in accordance with the inner diameter dimension of the body portion 11, a plurality of types of middle frames 30 having different formation positions and sizes of the protruding portions 32, inclination angles of surfaces facing the body portion 11, and the like are prepared in advance.
Then, from these plural types of inner frames 30, projecting portions 32 that can position the conduction springs 24 are arranged so that the deflection amount of the conduction springs 24 becomes a predetermined deflection amount α when the movement 20 is mounted on the body portion 11. The provided middle frame 30 is selected. For example, when the movement 20 is mounted on the trunk portion 11 having a small inner diameter as shown in FIG. 3, the protruding portion capable of positioning the conduction spring 24 in a state inclined at a small angle with respect to the tangential direction of the movement 20. The middle frame 30 having 32 is selected. On the other hand, as shown in FIG. 6, when the movement 20 is mounted on the body 11 having a large inner diameter, the conduction spring 24 is positioned so as to be inclined at a large angle with respect to the tangential direction of the movement 20. The middle frame 30 having the part 32 is selected. FIG. 6 is an enlarged plan view of the vicinity of a conduction spring as an elastic member in a timepiece having a body portion having a large inner diameter.

Further, when the movement 20 is mounted on the middle frame 30, the base end portion of the conduction spring 24 fixed to the movement 20 is brought into contact with the tapered surface 33 of the protruding portion 32 as shown in FIG. Next, the movement 20 and the middle frame 30 are positioned. Then, the movement 20 is pushed into the inner peripheral portion of the middle frame 30, and the movement 20 is fitted into the middle frame 30. Here, due to the stress that pushes the movement 20 into the middle frame 30, the conduction spring 24 bends to the outer diameter side along the tapered portion of the protruding portion 32, and as shown in FIG. 5B, the trunk portion 11 of the protruding portion 32. It is positioned in contact with the surface facing the.
At this time, the leading end of the conduction spring 24 protrudes from the spring insertion window 34 to the outer diameter side by a predetermined dimension from the outer peripheral surface of the middle frame 30 (dashed line in FIGS. 3 and 6).

In addition, a glass edge 13 on which a windshield 12 is mounted in advance is fixed to the edge fixing part 111 on the body part 11 of the case 10. Then, the middle frame 30 and the movement 20 held by the middle frame 30 are attached to the trunk portion 11.
At this time, the conduction spring 24 protruding from the spring insertion window 34 of the middle frame 30 is connected to the tapered portion 2 at the tip.
41 abuts on the end of the inner peripheral surface of the body 11. When the movement 20 is pushed into the body portion 11, the taper portion 241 of the conduction spring 24 is pressed by the inner peripheral surface of the body portion 11 due to the stress, and the conduction spring 24 is bent toward the movement 20 side. At this time, the conduction spring 24 is connected to the middle frame 30.
Therefore, since the deflection amount at the time of insertion of the movement 20 is set to α, the constant deflection amount α
And is brought into contact with the inner peripheral surface of the body portion 11 with a constant contact pressure.

Thereafter, the back cover 14 is fixed to the back cover fixing portion 112 of the trunk portion 11, whereby the assembly of the timepiece 1 is completed.

Here, FIG. 7 shows the relationship between the amount of deflection of the conduction spring 24 and the contact pressure.
In FIG. 7, the conductive spring 24 is made of a stainless steel strip for spring (SUS301),
Plate thickness = 20 (1/100 mm), spring width = 40 (1/100 mm), spring length = 286 (
1/100 mm) leaf spring was used. The diameter of the movement 20 is 3150 (1
/ 100 mm), and the inner diameter of the body 11 is 3220 (1/100 mm), 3320 (1
/ 100 mm) case 10 was used to measure the amount of deflection and contact pressure of the conduction spring 24. Further, FIG. 7 shows a measurement result of a conventional timepiece in which the inner frame 30 is not provided and the conduction spring 24 is set at a position corresponding to the trunk portion 11 having a large diameter.
That is, in the conventional timepiece, when the movement 20 is mounted on the body portion 11 having a large diameter, the conduction spring 24 exhibits a relatively appropriate contact pressure (50 to 100 g) and the amount of bending is small. The settling is also reduced. However, when the movement including the conduction spring 24 is inserted into the body portion 11 having a small inner diameter, the deflection amount of the conduction spring 24 increases and the contact pressure also increases (120 to 140 g). Therefore, the force for deflecting the conduction spring 24 also increases in the same way as the contact pressure, making it difficult to assemble the movement 20 into the body 11. Further, as the amount of bending of the conduction spring 24 increases, the settling also increases, and the conduction spring 2
There are also inconveniences such as the life of 4 being shortened and the conduction spring being deformed during assembly. Furthermore, the conductive spring 24 having such a set-up is replaced with the trunk portion 11 having a larger inner diameter.
If it guides to, there also exists a problem that the contact pressure required for conduction | electrical_connection cannot be ensured.
On the other hand, in the timepiece 1 of the present embodiment, the deflection amount of the conduction spring 24 is set to a constant value α (for example, the deflection amount α = 50 in the present embodiment) by the middle frame 30. That is, in FIG. 7, regardless of the value of the inner diameter dimension of the body portion 11, the contact pressure and the amount of settling of the conduction spring 24 become the contact pressure at point P (about 60 g) and the set amount of setpoint at point Q. Therefore, the stress required to bend the conduction spring 24 when the movement 20 is inserted into the body 11 is also a constant value. That is, the deflection amount α so that the movement 20 has a contact pressure at which the grounding is sufficiently possible.
Therefore, the movement 20 can be easily inserted regardless of the size of the trunk portion 11. Further, since the amount of bending of the conduction spring 24 is reduced, there is no settling, which can contribute to the extension of the life of the conduction spring.

[Effects of the present embodiment]
As described above, in the timepiece 1 of the above-described embodiment, the middle frame 30 has the conduction spring 24 so that the deflection amount of the conduction spring 24 becomes the predetermined deflection amount α when the movement 20 is inserted into the body portion 11. A protrusion 32 for positioning is provided.
For this reason, by selecting an appropriate inner frame 30 according to the inner diameter dimension of the body portion 11, it is possible to obtain a constant deflection amount α of the conduction spring 24 when the movement 20 is mounted. At this time, by setting the amount of deflection α so that the movement 20 can be grounded at a sufficiently sufficient contact pressure, the movement 20 can be moved to the body 11 with a small force regardless of the diameter of the body 11. Can be stored. Therefore, the work load in the assembly work of the watch 1 can be reduced,
Work efficiency can be improved.
In addition, since the amount of bending of the conduction spring 24 is reduced, it is possible to prevent spring settling due to bending. Therefore, the life of the conduction spring 24 can be extended, and the timepiece 1 of good quality can be provided.

Further, as the elastic member restricting portion, a protruding portion 32 protruding from the pressing piece 31 of the middle frame 30 is used. For example, when the middle frame 30 is formed by injection molding, such a projection 32 is formed by the projection 3.
By using a cavity mold having a shape corresponding to 2, it is possible to easily perform integral molding. Therefore, for example, a complicated operation such as fixing the protruding member to the middle frame 30 and a complicated configuration are not required, and the conduction spring 24 can be easily positioned at a predetermined position with a simple configuration.

Further, a tapered surface 33 is formed at the tip of the protruding portion 32.
For this reason, when attaching the middle frame 30 to the movement 20, the conduction spring 24 can be bent along the tapered portion 241. Therefore, the positioning work of the conduction spring 24 can be easily performed, and the working efficiency can be improved.

A tapered portion 241 is formed at the distal end portion of the conduction spring 24. For this reason, when accommodating the movement 20 in the trunk | drum 11, the conduction | electrical_connection spring 24 can be bent along the taper part 241, and mounting | wearing of the movement 20 becomes easy. Therefore, working efficiency can be further improved.
In addition, since the amount of deflection of the conduction spring 24 is set to a constant value α regardless of the diameter of the body portion 11, when the movement 20 is inserted, The position in contact with is also substantially the same. That is, in a configuration in which the amount of bending of the conduction spring differs depending on the inner diameter dimension of the trunk section 11, for example, as shown by the broken line in FIG. 4, the trunk section 11 with a larger inner diameter dimension and the trunk section 11 with a smaller inner diameter dimension are used. Correspondingly, the taper portion 241 needs to be enlarged. Further, such a tapered portion 241 has higher rigidity than a portion where the tapered portion 241 is not provided. Therefore, when the taper portion 241 becomes longer with respect to the entire length of the spring, the elastically deforming spring portion is shortened, and excessive stress is applied to the spring portion, so that settling is likely to occur. On the other hand, in the said embodiment, since the taper part 241 can be made small, the length of a spring part becomes long and it becomes difficult to produce settling. Therefore, the life of the conduction spring 24 can be extended and inconveniences such as a decrease in contact pressure can be prevented.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, the configuration in which the tapered portion 241 is provided in the conduction spring 24 is shown. However, for example, a configuration in which the tapered portion 241 is not provided may be employed.

In addition, the protruding portion 32 is provided from the pressing piece 31 of the middle frame 30, but is not particularly limited as long as the deflection amount of the conduction spring 24 is set to a constant value α. For example, the spring positioning member is attached to the middle frame 30. It is good also as a structure which provides separately.

Furthermore, although the structure which forms a taper surface in the protrusion part 32 and guides the conduction | electrical_connection spring 24 along a taper surface was shown, it is good also as a structure in which a taper surface is not formed, for example. In this case, the conduction spring 24 may be positioned using a jig or the like that pushes the conduction spring 24 into the outer diameter side of the protrusion 32.

In addition, the configuration in which the conduction spring 24 is provided on the back cover 14 side on the peripheral surface of the movement 20 is shown. However, for example, a configuration in which the conduction spring 24 is provided on the surface facing the dial 22 may be used.

Moreover, although the example which forms the spring insertion window 34 which cuts off the surrounding surface of the inner frame 30 and penetrates the conduction | electrical_connection spring 24 was shown, it is a hole only in the insertion location of the conduction | electrical_connection spring 24 in the surrounding surface of the inner frame 30, for example It is good also as a structure which provides.

Furthermore, in the said embodiment, although the conduction | electrical_connection spring 24 was extruded to radial direction by the protrusion part 32, when the movement 20 was accommodated in the trunk | drum 11, it showed the structure positioned at the position where bending amount becomes (alpha), Not limited to this. For example, in the initial state, a conduction spring that protrudes in the radially outward direction is pushed into the inner diameter side of the movement 20 by the protruding portion 32, and the movement 20 is housed in the body portion 11 and positioned so that the amount of deflection is α. Also good. in this case,
The inner frame 30 is installed on the movement 20 by forming a tapered surface that is inclined from the inner diameter side toward the outer diameter side toward the opposite end of the protruding portion 32, that is, toward the protruding tip of the protruding portion 32. At this time, the conduction spring 24 can be bent along the tapered surface, and the installation work is facilitated.

In addition, the specific structure and procedure for carrying out the present invention can be appropriately changed to other structures and the like within a range in which the object of the present invention can be achieved.

1 is an overall view showing an outline of a timepiece according to an embodiment of the present invention. It is a disassembled perspective view at the time of disassembling the timepiece of the embodiment into a case, a movement, and an inner frame. FIG. 6 is an enlarged plan view of the vicinity of a conduction spring as an elastic member in a timepiece including a body portion having a small inner diameter. In the timepiece of the embodiment, it is a diagram showing the shape of the tip of the conduction spring. In the timepiece of the above embodiment, it is a cross-sectional view enlarging the vicinity of the conduction spring, (A) is a diagram showing the state before attaching the middle frame to the movement, (B) is a state where the middle frame is attached to the movement. FIG. FIG. 5 is an enlarged plan view of the vicinity of a conduction spring as an elastic member in a timepiece having a body portion having a large inner diameter. It is a figure which shows the relationship between the bending amount of a conduction spring, and contact pressure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Timepiece, 10 ... Case, 11 ... Body part, 20 ... Movement, 24 ... Conduction spring as elastic member, 241 ... Tapered part, 30 ... Middle frame, 32 ... Projection part as elastic member regulation part, 33
... tapered surface.

Claims (5)

A middle frame that has a time display means and holds the outer peripheral portion of the movement from which the elastic member for conduction projects in the outer diameter direction, and is housed in a predetermined position of the metal case together with the movement,
In a state where the movement and the inner frame are removed from the case, the tip of the elastic member protrudes in a radial direction by a predetermined dimension from the inner diameter dimension of the case.
An intermediate frame comprising an elastic member restricting portion for restricting a protruding direction of the elastic member. In the middle frame of claim 1,
The elastic member restricting portion is a projecting portion that abuts on the movement side of the elastic member and pushes out to incline at a predetermined angle with respect to a tangential direction of an outer peripheral edge of the movement. A middle frame according to claim 2,
The projecting portion is formed with a tapered surface that pushes the elastic member toward the projecting direction when the middle frame is attached to the movement. A metal case,
The movement housed in the case and having a time display means for displaying the time,
An elastic member for conduction projecting in the outer diameter direction from the outer periphery of the movement;
A timepiece that holds an outer periphery of the movement and includes an inner frame housed in the case together with the movement,
The inner frame includes an elastic member restricting portion that restricts a protruding direction of the elastic member so that the elastic member bends by a predetermined amount when the movement is housed in the case. clock. The timepiece according to claim 4,
The case is formed in a substantially cylindrical shape,
The movement is housed inside the case cylinder in a state where the elastic member is bent toward the cylinder central axis side of the case.
The timepiece characterized in that the distal end portion of the elastic member is formed in a tapered shape that is inclined in a direction in which the movement is housed in the case from the distal end side toward the proximal end side.

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