JP2770143B2 - Pendulum clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pendulum clock.

[0002]

2. Description of the Related Art Conventionally, in a pendulum timepiece in which a pendulum is incorporated in a timepiece frame, the tip of an edge serving as a fulcrum of a pendulum strongly collides with a receiving portion due to vibration, impact, or the like generated when the timepiece is conveyed. In order to prevent this, cushions are attached to the pendulum of the watch and the box of the watch. For this reason, in the case where the pendulum is incorporated in the timepiece frame, extra cost is required because it takes time and effort to attach the cushioning material to the timepiece pendulum and the timepiece box. Therefore, there is an apparatus in which the clock frame and the pendulum are separated from each other, and the user himself attaches the pendulum to the clock frame to reduce the cost.

[0003]

However, in the second prior art in which the user attaches the pendulum to the watch frame, the user can easily attach the pendulum only by providing the bearing portion on the watch frame. Therefore, there is a problem that it is difficult to attach a pendulum to the timepiece frame because there is no guide or other means provided.

An object of the present invention is to provide a pendulum clock in which a pendulum can be easily attached to a timepiece frame with a simple configuration.

[0005]

To achieve the above object, a pendulum clock according to the present invention is a pendulum clock in which a pendulum driven via an electromagnetic driving device is swingably mounted on a clock frame. The watch frame is provided with a substantially V-shaped support protrusion serving as a fulcrum, and the pendulum is provided with a receiving portion having a substantially V-shaped receiving groove supported by the support protrusion. A cylindrical portion having a fulcrum as a center protrudes around the portion, and a guide wall having an inner wall having a diameter slightly larger than the outer diameter of the cylindrical portion protrudes from both sides of the support protrusion on the timepiece frame. It is preferable that the guide wall protrudes rearward from the rear end surface of the support protrusion. The receiving part engages with the support protrusion,
An engagement portion for preventing the pendulum from coming off in the axial direction may be provided.

[0006]

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a dial 2 is provided on the front of a front frame 1, and a front cover C is provided in front of the dial. In the space between the front cover C and the dial 2, an indicator 3 formed of an hour hand and a minute hand penetrates the dial 2 from a clock mechanism (not shown) fixed to the back of the dial 2 and projects to the front. It is attached to a shaft (not shown).

As shown in FIGS. 2 to 4, a rear frame (clock frame) 4 is fixed to the rear surface of the front frame 1 by screws (not shown), and an electromagnetic drive device to be described later is mounted on the rear surface of the rear frame 4. A pendulum 5 driven through the arm is swingably mounted. Pendulum 5
Is located above the front frame 1, and the swinging motion of the pendulum 5 can be visually recognized from the front of the front frame 1. A lower bearing 6 is fixed to the center of the rear surface of the rear frame 4 by a screw 7. Is protruding from the top. An upper bearing 8 is fixed to the pendulum 5 at a substantially central position by a screw 9, and the upper bearing 8 has a substantially V-shaped receiving groove 8a (see FIG. 3) supported by a support projection 6a. A receiving portion 8b is provided. The receiving portion 8b is provided with a locking portion 8b1 (see FIG. 2). The locking portion 8b1 is engaged with both end surfaces of the support projection 6a to prevent the pendulum 5 from coming off in the axial direction. . On the back surface of the pendulum 5, a cylindrical portion 5a centering on the fulcrum S protrudes around the receiving portion 8b. 8b can be attached.

The rear frame 4 is provided with a pair of guide walls 4a having inner walls slightly larger than the outer diameter of the cylindrical portion 5a on both sides of the support projection 6a. The guide wall 4a protrudes rearward from the rear end face 6a1 of the support protrusion 6a. Therefore, even if the rear frame 4 is accidentally bumped against something hard when the timepiece is transported with the pendulum 5 removed, the support projection 6a is protected by the guide wall 4a, and the pendulum 5
Of the edge serving as the fulcrum S of the image is not crushed. A permanent magnet 10 is fixed below the front of the pendulum 5, and the front side of the rear frame 4 in front of the position where the pendulum 5 is at rest (neutral position) is formed to have a small thickness. A coil 11 mounted on an electronic circuit (not shown) is provided, and the permanent magnet 10 and the coil 11 constitute an electromagnetic driving device K.

The pendulum 5 is usually removed from the rear frame 4 during transportation. In order to attach the pendulum 5 to the rear frame 4, the outer diameter of the cylindrical portion 5 a is grasped, and the outer diameter of the cylindrical portion 5 a and the pair of guide walls 4 are interposed between the pair of guide walls 4 a of the rear frame 4.
By attaching the pendulum 5 so that the centers thereof are aligned with each other, the pendulum 5 can be easily attached to the rear frame 4.

In this embodiment, the rear frame and the lower bearing are separated and the pendulum and the upper bearing are separated. However, the present invention is not limited to this. It is needless to say that the supporting projection may be provided on the pendulum and the pendulum and the upper bearing may be integrated with each other and the receiving part may be provided on the pendulum.

A pendulum driven via an electromagnetic drive supplies drive energy to the drive which is generally greater than the friction loss at the fulcrum. For this reason, in order to prevent the swing width of the pendulum from increasing with the passage of time and to obtain a predetermined swing width, a contact portion is provided, and the pendulum contacts the contact portion. Since the guide wall 4a of this embodiment can also serve as the contact portion of the pendulum, it is not necessary to newly provide a contact portion on the rear frame.

[0012]

As described above, according to the present invention, a watch frame is provided with a substantially V-shaped support protrusion serving as a fulcrum, and a pendulum is provided with a receiving portion having a substantially V-shaped receiving groove supported by the support protrusion.
In addition, a cylindrical portion around the fulcrum is protruded around the receiving portion, and a guide wall having an inner wall having a diameter slightly larger than the outer diameter of the cylindrical portion is provided on both sides of the support protrusion on the timepiece frame. The pendulum can be easily attached to the watch frame.

If the guide wall is made to protrude rearward from the rear end face of the support projection, even if the rear frame is erroneously bumped against something hard when the timepiece is transported with the pendulum removed, The end of the edge serving as the fulcrum of the pendulum does not collapse because it hits the wall and protects the support protrusion.

If the receiving portion is provided with a locking portion which engages with the support projection and prevents the pendulum from coming off in the axial direction, the pendulum does not come off in the axial direction during the swing driving.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of FIG.

FIG. 3 is a partially cutaway rear view of FIG. 1;

FIG. 4 is a longitudinal sectional view of a main part of a rear frame.

[Explanation of symbols]

 Reference Signs List 4 rear frame (clock frame) 4a guide wall 5 pendulum 5a cylindrical portion 6a support protrusion 6a1 rear end surface 8a receiving groove 8b receiving portion 8b1 locking portion S fulcrum K electromagnetic drive device

Claims (3)

(57) [Claims] 1. A pendulum timepiece having a pendulum driven via an electromagnetic drive device and swingably mounted on a timepiece frame, wherein the timepiece frame has a substantially V-shaped support protrusion serving as a fulcrum. The pendulum has a substantially V supported by the support protrusion.
A receiving portion having a U-shaped receiving groove is provided, and a cylindrical portion centering on the fulcrum is protruded around the receiving portion. A pendulum clock characterized in that a guide wall having an inner wall having a diameter slightly larger than the outer diameter of the cylindrical portion is protruded. 2. The pendulum clock according to claim 1, wherein the guide wall projects rearward from a rear end surface of the support projection. 3. The receiving part according to claim 1, wherein the receiving part is provided with an engaging part that engages with the support projection and prevents the pendulum from coming off in the axial direction. Pendulum clock.