JPH0527022Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a so-called world clock that can display the time in various parts of the world.

(Prior art) The world clock has a rotatable place name display board on the front, and by rotating it, the place names of various places are aligned with the reference line, making it possible to know the time in each place. . As an example of a specific configuration, as shown in the third diagram, a front cover 12 having a step on the outer circumference is fitted onto the inner circumference of the front surface of the machine mounting plate 11, which has a step on the outer circumference. A ring-shaped front frame 13 is placed over both steps, and the inside of the watch frame 14 is brought into contact with the front side of the front frame, and a screw (not shown) is screwed into the watch frame from the back cover 15. The front frame 13 and the front cover 12 are prevented from coming off by inserting and fixing with screws. A place name plate 16 is attached to the front of the front frame 13, and by rotating the front frame, the place names of various places can be aligned with the reference line. Note that 17 is a dial plate attached to the front surface of the machine mounting plate 11.

(Problems to be Solved by the Invention) To assemble the above structure, first fit the front glass 12 onto the machine mounting plate 11, cover the front frame 13, and then place the watch frame 14 on top of the step of the front frame 13. Since the watch frame body 14 is screwed and fixed to the back cover, rotation of the front frame 13 comes into contact with the machine mounting plate 11, the front glass 12, and the watch frame body 14 at the same time. It is sliding. Since the number of parts in contact with the front frame 13 is large, high-precision parts are required to achieve smooth rotation, and this also increases the number of man-hours required to assemble the watch, which is one of the causes of high manufacturing costs. It's getting old. Furthermore, since the front frame 13 is sandwiched between the front cover 12 and the clock frame 14, it is difficult to rotate the front frame 13, which makes it troublesome to align the place name with the reference line.

Therefore, the purpose of the present invention is to reduce the number of sliding parts, reduce the number of man-hours for assembling the watch, and provide a world timepiece that is easier to use.

(Means for Solving Problems) The feature of the present invention is that it consists of a machine mounting plate, a front cover, and a place name display plate. The outer circumferential boundary of is bent at right angles to form a cylindrical portion, the cylindrical portion forming an outwardly bent flange at its front end, the flange having a The place name display board has a front ring shape and an L-shaped cross section, and has a plurality of locking claws formed on the outer peripheral back surface thereof. The place name display plate is fitted into the cylindrical portion of the machine mounting plate, and the place name display plate is slidably attached to the outer periphery of the front cover and the front cover is irremovably joined to the place name display plate. The plate is slidably attached to the machine mounting plate with the plurality of locking pawls engaged with protrusions on the rear surface of the machine mounting plate.

(Function) In this invention, by fitting the front cover into the cylindrical part of the machine mounting plate, and pushing the place name display plate into contact with the machine mounting plate and the front cover from the front, the place name display plate can be formed. A plurality of locking pawls are elastically deformed and engaged with the back surface of the machine mounting plate. The place name display plate engaged with the machine mounting plate is held rotatably in the circumferential direction,
Also, the front cover cannot be removed forward.

(Example) An example of the present invention will be described below with reference to the drawings.

The base of the table clock (not shown) as shown in the first diagram
An example in which a world clock is attached to a support frame 1 that is integrated with a support frame 1 will be explained.

The structure of the present invention includes a mechanical mounting plate 3 holding a watch mechanical body 2 on the back, a front cover 4 fitted to the front of this mounting plate, and a place name display plate 5 engaged with this mechanical mounting plate. The front cover 4 comes into contact with the extension of the place name display board 5 and cannot be removed. A back cover 6 is fixed to the back of the machine mounting plate 3 via screws 7.
The support frame 1 is held between a machine mounting plate 3 and a back cover 6.

Next, the specific configuration of the present invention will be explained.

The machine mounting plate 3 is dish-shaped as shown in the first and second figures, and has a hole 3b in the center of the central disk portion 3a through which the pointer shaft 2a passes, and the front surface is made of an aluminum plate. A dial 8 is attached.
On the back side of the disc part 3a, there is a holding piece 3 of the watch mechanical body 2.
c and 3c are integrally provided. This holding piece 3
At the tip of c, there is a protrusion 3 facing inward to prevent detachment.
d and 3d are formed.

The outer circumferential boundary of the disc portion 3a is bent at a right angle and extended forward to form a cylindrical portion 3e, and this cylindrical portion is further bent at a right angle and expanded outward at the front end to form a flange portion 3f. is formed. Flange part 3f
The front surface is flat, and a concentric ring-shaped projection 3g is formed approximately in the center thereof. A small protrusion 3h is formed on the back surface of the flange portion 3f along the outer periphery of the flange portion, and a back cover 6 is formed inside the small protrusion 3h.
A mounting portion 3i for fixing the support frame 1 with screws 7, and a contact portion 3j with the support frame 1 are formed.

As shown in the first figure, the front cover 4 has a step 4b formed at the boundary of the outer circumference of the front end of the tapered attachment part 4a which is slightly larger at the rear, and a place name is printed on the outer circumference of the front cover part 4c. Position reference line display board 9
is provided.

The place name display board 5 has a front ring shape, and its cross section is L-shaped as shown in the first figure, and the boundary between the front part 5a and the outer peripheral part 5b is chamfered at about 45 degrees, and the entire circumference is rounded. An operating portion 5c is formed by knurling. A locking pawl 5d that can be engaged with a small protrusion 3h of the machine mounting plate 3 is provided inside the rear end of the outer peripheral portion 5b.
are formed at three locations at equal intervals.

Next, the assembly method and usage will be explained.
First, the holding piece 3c and the protrusion 3d on the back side of the machine mounting plate 3
The timepiece mechanism body 2 is held in place, the pointer shaft 2a is made to protrude from the pointer shaft hole 3a to the front, and the pointer 10 is attached thereto. Next, after fitting the front cover 4 into the cylindrical part 3e of the machine mounting plate 3, align the outer periphery 5a of the place name display plate 5 with the outer periphery of this machine mounting plate and press both, and the locking claw The tip of 5d is slightly deformed outward, and the small protrusion 3 on the back of the outer periphery of this machine mounting plate
h and turns to the back side, whereby the place name display plate 5 and the machine mounting plate 3 are engaged. At this time, the inner surface of the place name display board 5 is in frictional contact with the tips of the projections 3g and small projections 3h. In order to design the place name display board 5 to obtain a predetermined slip torque, it is better to have a wide span between the protrusion 3g and the small protrusion 3h. Since the span can be made long, it is easily deformed, and the locking pawl 5d is also easily deformed, and even if there is a slight design error, it is easy to obtain a predetermined slip torque.

In addition, the place name display board 5 has a step 4 on the front cover 4.
b, and prevents this front cover from being removed from the machine mounting plate 3.

Therefore, when the operating part 5c of the place name display board 5 is moved by hand to rotate the place name display board 5, the inner surface of the place name display board 5 comes into contact with the protrusion 3g of the machine mounting plate.
Further, the locking claw 5d slides with a predetermined slip torque while contacting the small protrusion 3h, and further slides while contacting the step 4b of the front cover, so that the place name is aligned with the reference line of the display board 9 of the front cover. Can be matched.

(Effects of the invention) As described above, according to the invention, the locking pawl can be easily locked to the protrusion of the machine mounting plate by using the elastic deformation force of the place name display board, and the number of parts is reduced.
It is easy to assemble and disassemble the watch, and the simple configuration also simplifies the molding mold, which is effective in reducing molding costs.When turning the outer periphery of the place name plate by hand, this place name plate Since it slides with a predetermined slip torque on the protrusions protruding from both sides of the machine mounting plate, it has remarkable effects such as being able to easily match place names.

[Brief explanation of drawings]

Figures 1 and 2 relate to an embodiment of the present invention, in which Figure 1 is a sectional view thereof, Figure 2 is a front view of the machine mounting plate, and Figure 3 is a sectional view of essential parts of a conventional example. It is. 2...Clock mechanical body, 3...Machine mounting plate, 3e...
...Cylindrical part, 3f...Flange part, 3g, 3h...
Projection, 4...Front cover, 5...Place name display board, 5
d...Latching claw.

Claims (1)

[Scope of claim for utility model registration] Consisting of a mechanical mounting plate, a front cover, and a place name display plate, the mechanical mounting plate holds the watch mechanical body on the back, and the outer peripheral boundary of this mounting plate is bent at a right angle. to form a cylindrical part, this cylindrical part has a flange part bent outward at its front end, and this flange part has protrusions formed on both the front and back surfaces, The place name display board has a front ring shape and an L-shaped cross section, and has a plurality of locking claws formed on the back surface of its outer periphery, and the front cover is connected to the cylindrical part of the machine mounting plate. The place name display plate is slidably attached to the outer periphery of the front cover, and the front cover is irremovably joined to the outer periphery of the front cover. A world clock characterized in that a locking pawl is slidably attached to the machine mounting plate in a state in which it is engaged with a protrusion on the rear surface of the machine mounting plate.