JPH0112222Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the backside structure of a watch, and more particularly to the connection structure between an external operating member and a movement.

[Background of the idea]

In recent years, most wristwatches have been made of quartz, and time accuracy has improved significantly, but on the other hand, luxury items,
It is becoming difficult to differentiate popular products based on precision. Therefore, in order to increase product value, there has been a strong demand for multifunctional watches that are not only smaller and thinner but also equipped with new sensors.

The majority of conventional analog watches had only reused external operating members, but due to the above requirements, the commercialization of watches with external operating members such as various switch buttons has increased, just like digital watches. Therefore, the mechanism that connects these external operating members and the movement has come to be required to have a structure that has a small number of parts, is easy to work with after-sales service, and is reliable.

[Conventional technology and problems]

Figures 1 and 2 show an external operating shaft according to the prior art;
That is, it relates to a coupling structure between a switch shaft and a coupling lever attached to a movement. FIG. 1 is a partial sectional view showing an assembled state, and FIG. 2 is a perspective view of the coupling lever.

In FIGS. 1 and 2, a coupling lever 1 having a fork shape with a bent end into an approximately L-shape is screwed to a pipe 4 fitted to a base 3 made of resin or the like. , the engaging portion 1 of the coupling lever 1
a and 1b are engaged with the groove 2a of the switch shaft 2.

Reference numeral 5 denotes a switch terminal having spring properties, and is electrically configured in a circuit such that it is turned on when it comes into contact with the switch shaft 2, and turned off when it is separated from it.

In this state, when the switch shaft 2 is pushed in, the engaging portions 1a and 1b of the coupling lever 1 will move on the slope 2d of the switch shaft 2.
The large diameter portion 2e of the switch shaft 2
After passing through the engaging parts 1a and 1b, the engaging part 1
a and 1b engage with the groove portion 2c. At this time, the tip of the switch shaft 2 comes into contact with the switch terminal 5, and the switch is turned on.

Next, when the switch shaft 2 is pulled and moved in the opposite direction, the large diameter portion 2e passes through the engaging portions 1a and 1b in the same manner as when turning on the switch, and the switch shaft 2 returns to its original position. The switch turns off.

Click moderation is obtained by the spring force of the fork portions 1c and 1d of the coupling lever 1 during the on-off operation of the switch described above, but in order to reduce this variation, the angle and surface condition of the slopes 2d and 2f of the switch shaft 2 must be adjusted. must be kept constant, making processing difficult.

Further, the switch shaft 2 passes through the watch case and is directly connected to a push button or the like (not shown) for external operation, and the amount of movement of the switch shaft 2 in the axial direction is equal to the amount of movement of the push button.

Therefore, in the case of a small watch, the amount of protrusion of the push button should be kept as small as possible due to the design, so it must be made small, but the amount of movement of the switch shaft 2 is determined by the distance between the grooves 2a and 2c, and appropriate moderation should be taken. Since the slopes 2d and 2f cannot be steeply sloped, there is a design constraint in that the distance between the grooves 2a and 2c cannot be reduced beyond a certain level, which is a major drawback from a design standpoint.

On the other hand, when removing the switch shaft 2 for after-sales service, etc., pry the slit portion 1e of the coupling lever 1 with the tip of a screwdriver, expand the engaging portions 1a and 1b beyond the outer diameter of the switch shaft 2, and remove the switch shaft 2. While holding the watch with one hand, simultaneously press the engaging part 1a,
It is extremely difficult to pry open 1b with a screwdriver or the like and pull out the switch shaft 2 with one hand, and there is a danger that the screwdriver or the like may slip and damage other parts. Furthermore, if the engaging portions 1a, 1b of the coupling lever 1 are expanded too much, the fork portions 1c, 1d may be deformed or damaged.

When assembling the switch shaft 2, insert the tip 2b of the switch shaft 2 between the engaging parts 1a, 1b of the coupling lever 1, and push it in the axial direction.
b is pushed out by the slope 2g of the switch shaft 2, and the switch shaft 2 is assembled in a predetermined position, but
In this case as well, if the switch shaft 2 is not completely pushed in the axial direction and excessive force is applied in the diagonal direction, the coupling lever 1 may be damaged in the same way as described above.

As mentioned above, the conventional structure has design limitations, has very poor workability in terms of after-sales service, is prone to deformation and damage of the coupling lever, and is difficult to process the switch shaft 2. There were drawbacks such as high cost.

[Purpose of invention]

The present invention eliminates these drawbacks and provides a clock back structure that has an external operating member and a coupling lever that is free from design constraints, has good workability, is highly reliable, and is easy to process parts. The purpose is to

[Example of idea]

An embodiment of the present invention will be described below based on the drawings.

Embodiments of the present invention are shown in FIGS. 3, 4, and 5, where FIG. 3 is a partial sectional view showing an assembled state, FIG. 4 is a perspective view of the coupling lever, and FIG. 5 is an external operating member,
That is, it is a side view showing the engaging portion of the switch shaft and the coupling lever.

In the figure, 40 is the main plate, 60 and 70 are the main plate 4
The pin 30 fitted into the base plate 30 is a base molded from resin and fixed to the base plate 40 positioned by the pins 60 and 70. The gear train bridge 50 and the rear presser 80 are each fixed to the main plate 40 by screws, the switch shaft 20 is connected to the rear presser 80 and the main plate 40, and the coupling lever 10 is connected to the rear presser 80 and the gear train bridge 50. It is held between bases 30.

In the assembled state, the coupling lever 10 is slightly bent in the thickness direction, and the engaging portion 10a with the switch shaft 20 is aligned with the groove portion 20a of the switch shaft 20.
It is designed to press against the

The coupling lever 10 is connected to the groove 20a of the switch shaft 20.
It has an engaging part 10a and a holding part 10e that engage with the
The holding portion 10e and the holding portion 10a are connected by a connecting portion 10b bent into a substantially L shape,
Furthermore, it has a moderation spring part 10d branched from the holding part 10e.

The operation of this structure is such that when the switch shaft 20 is pulled by an external operation, the switch shaft 20 moves in the direction of the arrow, and the coupling lever 10 also guides the top of the base 30 into the elongated holes 10i and 10h provided in the holding part 10e. is moved linearly in the axial direction, and the chevron 10j of the moderating spring portion 10d of the coupling lever 10 is moved against the base plate 4.
When passing through the pin 40a fitted to the pin 40a, a moderation force is obtained by the springiness of the moderation spring section 10d, and at the same time, the terminal section 10g of the coupling lever 10 comes into contact with the contact spring 90, thereby being switched on.
Conversely, when the switch shaft 20 is pushed in, the coupling lever 10 similarly moves in the opposite direction and turns off the switch.

In the above structure, when removing the switch shaft 20 for after-sales service, etc., use the hole 8 of the back presser 80.
When a screwdriver, tweezers, etc. are inserted from 0a and the concave portion 10f of the coupling lever 10 is pushed downward, the coupling lever 10 is bent in the thickness direction using the corner 30a of the base 30 as a fulcrum.

As shown in FIG. 5, when the coupling lever 10 is bent to the position indicated by the dashed line, the engaging portion 10a of the coupling lever 10 is disengaged from the groove 20a of the switch shaft 20, and the relief portion 10c between the coupling portions 10b is removed from the switch. The switch shaft 20 is larger than the outer diameter of the shaft 20.
can be removed.

When assembling the switch shaft 20 again, insert the tip 20b of the switch shaft 20 between the connecting portions 10b of the coupling lever 10 and push it in the axial direction. When the coupling lever 10 is bent in the thickness direction and the switch shaft 20 is further pushed down, the engaging portion 10a engages with the groove 20 of the switch shaft 20.
It drops to a, and the installation is completed.

As mentioned above, the switch shaft 20 is removed by utilizing the spring properties of the coupling lever 10 in the thickness direction, so the stiffness of the coupling lever 10 is strong and there is no risk of deformation or damage. This eliminates prying movements and greatly improves work efficiency.

On the other hand, the moderation when operating the switch shaft 20 can be freely set by the spring force of the moderation spring portion 10d provided integrally with the coupling lever 10, the shape of the chevron 10j, and the diameter of the pin 40a fitted to the main plate 40. ,
Since the structure is independent of the switch shaft 20, design constraints due to the amount of movement of the switch shaft 20 can be eliminated, and furthermore, the switch shaft 20 can be processed much more easily than in the conventional structure, and costs can be reduced.

In addition, instead of the pin 40a of the main plate 40, a convex part of the main plate or other fixed parts may be used, or the connecting lever 10
It is clear that the same effect can be obtained even if only the shape of the coupling lever 10 is used instead of the elongated hole 10j for the guide.

6 and 7 are side views showing other embodiments of the coupling lever of the present invention, respectively. FIG. 7 shows a coupling lever 11 with a single coupling portion 11b, and FIG. An engaging portion 12a that engages with the switch shaft 20 of No. 12 is formed on a part of the lower surface side of the connecting portion 12b, and a relief portion 12c is formed at one end of the upper surface side, the gap being larger than the outer diameter of the switch shaft 20. The operation and effects are exactly the same as those described above.

[Effect of idea]

As is clear from the above embodiments, according to the present invention, design constraints can be resolved, and workability in disassembling and assembling after-sales service is good, there is no risk of parts deformation or damage, and processing is easy. It is possible to realize a low-cost backing structure.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional structure, FIG. 2 is a perspective view of a conventional coupling lever, and FIGS. 3, 4, and 5 all show a first embodiment of the present invention. FIG. 3 is a partial sectional view, FIG. 4 is a perspective view of the coupling lever, and FIG. 5 is a side view showing the engaging portion of the switch shaft and the coupling lever. 6 and 7 are side views showing the second and third embodiments of the present invention, respectively. 1, 10, 11, 12...coupling lever, 1a,
1b, 10a, 11a, 12a...Engaging portion of the coupling lever, 10e...Holding portion of the coupling lever, 10
b, 11b, 12b...Connecting portion of coupling lever, 1
0c, 12c... Relief part of coupling lever, 10d...
...moderation spring part of coupling lever, 2,20...switch shaft, 3,30...base.

Claims (1)

[Scope of utility model registration request] In a clock counter mechanism having a base, an external operating shaft, and a coupling lever that engages with the external operating shaft,
an engaging portion in which the coupling lever engages with a groove portion of the external operation shaft; a holding portion mounted to be slidable substantially linearly on the base; the holding portion and the engaging portion being approximately The connecting portion has an L-shaped connecting portion, and a moderation spring portion that is branched from the holding portion and provides moderation for axial movement of the external operating shaft, and the connecting portion has an escape for removing the external operating shaft. A clock back structure characterized by forming a part.