JPS5925034Y2 - waterproof crown - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a waterproof crown mechanism that ensures high water resistance through screw engagement with a watch side member.

From a usage and design perspective, wristwatches are becoming increasingly thinner and thinner, but at the same time there is also a demand for wristwatches to be more waterproof, which has made their mechanisms more complex. This makes it particularly difficult to downsize the crown.

This is shown in the conventional example shown in Fig. 1, for example,
To explain with a waterproof crown as shown in Publication No. 091,
A crown main body 3 is detachably provided on the threaded portion 2a of the sleeve 2 fixed to the watch side 1, and the crown main body 3 is screwed to ensure waterproofness. A storage tube 4 is attached that extends to cover the operating vibro, and the inner surface of the tip of this engagement tube 4 is cut into a square shape to form a clutch 4a, and the crown body 3 is removed from the sleeve 2 mentioned above. The structure is such that when the winding stem 5 is turned, it engages with the corner 6a of the operating vibro and transmits the rotation of the crown to the winding stem 5.

In other words, in such a crown, the crown body 3 is inserted into the sleeve 2.
When screwing or unscrewing the winding stem 5, the storage tube 4 and the operating vibro are uncoupled so that the rotation does not directly act on the winding stem 5, and the two are engaged only during operations such as adjusting the pointer. Because of this, the corner 6a, which is larger than the diameter of the operating vibro, must be engaged with the clutch 4a at the end of the storage tube 4, and the diameter of the storage tube 4, or even the diameter of the entire crown, inevitably becomes larger. It has the disadvantage of becoming larger.

In addition, a waterproof crown as shown in Fig. 2, for example,
In the waterproof crown as described in Japanese Patent No. 2-165661, the storage tube 14 is welded to the crown body 3 to prevent the diameter from increasing due to screwing, and a square hole 15a is provided at the tip of the crown.
The sliding ring 15 with the square hole 1 is caulked, and the square hole 1 is
5a is engaged with an actuation pipe 16 having a rectangular cross section in a spline type manner, and since the actuation pipe 16 itself has a rectangular cross section, the diameter of the retaining tube 14 can be made thinner by that amount, and the diameter of the entire crown can be reduced accordingly. However, on the other hand, with this structure, the storage tube 14 and the crown body 3 may not be accurately welded, causing vibration of the engagement tube 14, which not only makes the waterproof property unstable; The installation is unreliable, and since the sliding ring 15 is fixed with caulking, there is no problem with axial force, but when rotational force is applied, the caulking loosens and slides. This has the disadvantage that the movable ring 15 and the engagement tube 14 may become loose, causing accidents such as loss of functions such as pointer adjustment.

In order to eliminate the above-mentioned drawbacks of highly water-resistant crowns, the present invention provides a waterproof crown that has a simple structure and is highly reliable, which allows a wristwatch to be made thinner while maintaining its water-resistant function.

Hereinafter, the details of the present invention will be explained based on the drawings. Fig. 3 shows one embodiment of the present invention, and the same parts as in Fig. 12 are given the same reference numerals, and the explanation thereof will be omitted.

Therefore, the storage tube 24, which is a characteristic part of the present invention, is cut from a member integral with the crown body 23, and furthermore, the inner surface of the storage tube 24 has a pre-processed circular hole 24b. A square or hexagonal hole 24a is cut from the lower end to the center by, for example, a broach.

Reference numeral 26 denotes an operating pipe that is slidably attached to the inner surface of the engagement tube 24, and a square flange portion 26a that fits loosely into the square hole 24a of the engagement tube 24 described above is formed at the center of its outer periphery. The upper surface serves as a receiver for a coil spring 7 that always urges the operating pipe 26 downward, and the lower surface serves as a portion that comes into contact with an operating pipe receiver 25, which will be described later.

Reference numeral 25 denotes the above-mentioned operating pipe holder, which is made of an annular plate as shown in the opening of FIG. 3, and is caulked at the end of the engagement tube 24 after the operating pipe 26 is inserted into the storage tube 24.

In the embodiment described above, when an operation is started to unscrew the crown body 23 from the sleeve 2 by rotating the crown body 23 in order to correct the pointer from the waterproof state shown in FIG. It is transmitted from the square hole 24a of the joint pipe 24 to the operating pipe 26 via the flange portion 26a.

In recent self-winding watches, although this position of the winding stem 5 does not engage other parts of the movement, this rotation does not have any effect on other parts, and even if the mainspring winding member is Even if there is a binding relationship, this rotation is slight, so there will be no problem of the mainspring winding up.

After removing the crown body 23 from the sleeve 2, pull up the crown body 23 to a predetermined position to remove the actuating pipe receiver 2.
5 through the flange portion 26a that is in contact with the
6 is pulled up, and the winding stem is further pulled to perform a correction operation similar to the conventional device.

In addition, although FIG. 3 showing this embodiment shows a structure in which the operating pipe 26 and the winding stem are integrated by screwing,
The actuating pipe and the winding stem can also be integrally formed from the same material.

As described above, according to the present invention, since the crown body and the engagement tube are made of the same material, the number of parts can be reduced and the centering of both can be performed accurately.

In addition, since the square flange of the actuating part is slidably fitted directly into the square hole drilled in the engagement tube, not only can the rotation of the crown be directly transmitted to the winding stem, but there is no need for a clutch. The diameter of the minute storage tube and the outer shape of the crown can be reduced, making it possible to make the watch thinner.

Furthermore, since only the axial force of the actuating part acts on the receiver attached to the end of the engagement tube, the simplest method of fixing can be used to attach the receiver, making the installation process extremely easy. It has excellent effects as a waterproof crown.

[Brief explanation of the drawing]

Figures 1 and 2 (a) are sectional views of conventional waterproof crowns; Figure 3 (a) is a cross-sectional view of a waterproof crown showing an embodiment of the present invention; FIG. 3 is a cross-sectional view taken along line A-A in FIG. 1...Watch side, 2...Sleeve, 3,
23... Crown body, 4.14.24...
- Engagement pipe, 25... Actuation pipe holder, 6.16.
26... Working pipe.

Claims (1)

[Scope of utility model registration request] In a crown mechanism that ensures high water resistance through screw engagement with the watch side member, a square hole is bored in the storage tube formed integrally with the crown body, and a square flange is installed at the operating part at the tip of the winding stem. A waterproof crown, characterized in that it is slidably fitted into the square hole, and a receiver for receiving the square flange is caulked to the end of the storage tube.