JPH08248148A - Screw-lock crown structure - Google Patents

Abstract

PURPOSE: To provide a screw-lock crown structure in which a crown can be locked or its lock can be released simply and surely. CONSTITUTION: A central shaft 4 which is attached to a core and a crown pipe 8 which is attached to a crown head 6 are constituted so as to be deformed and fitted. That is to say, a deformed part 4b is formed at the central shaft 4, and an internal deformed part 8b is formed at the crown pipe 8. Then, when the crown head 6 is moved in the axial direction, the deformed part 4b and the deformed part 8b are constituted so as to be fitted and removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw lock crown structure in which a crown head is screwed and locked to a screw pipe fixed to a watch case such as used in a diver watch.

[0002]

2. Description of the Related Art In this type of conventional crown structure used in electronic timepieces, the rotation of the crown is always transmitted to the winding stem. When the crown is pulled out, the structure inside the movement causes It became possible to rotate the pointer by rotation, and by pushing in the crown, the rotation of the winding stem was not transmitted to the pointer. In this crown structure, when the crown head is screwed onto the screw pipe, the crown head is in a state of freely rotating with the winding stem, so that the crown head can be easily screwed.

However, in a mechanical timepiece or the like which requires winding of a mainspring, since the rotation of the winding stem is always transmitted to the winding mechanism of the mainspring, even when the crown head is screwed onto the screw pipe. A large amount of torque was required to wind the crown and turn the crown head, and when the mainspring was rolled up and the crown was locked, it was sometimes impossible to screw the crown head onto the screw pipe.

Therefore, as in the case of the crown structure disclosed in Japanese Utility Model Laid-Open No. 51-80169, a crown dowel having a threaded portion on the outer periphery of the end is fixed to the winding stem and screwed into the threaded portion. It has been proposed that a pipe provided with a section is fixed to a crown head, and a winding stem and the crown head are screwed together in a detachable state.

[0005]

As described above, in the crown structure in which the crown dowel fixed to the winding stem and the pipe fixed to the crown head are screwed and connected,
Since the pipe and the crown dowel are fitted and removed while rotating the crown head, the winding stem sometimes rotates when the crown head rotates, and there is a problem that the pointer moves.

[0006] Further, it is difficult to properly screw the screw inside the crown only by the feeling of the hand, and there is a problem that the wear of the screw thread is accelerated.

Further, since it is necessary to form a screw having a high screwing precision in the pipe, a high processing precision is required, and there is a problem that the cost is increased.

The present invention has been made in view of the above problems.
An object of the present invention is to provide a screw lock crown structure which is configured such that the crown head and the winding stem are fitted into and removed from each other by the movement of the crown head in the axial direction, and can be locked or unlocked easily and surely. is there.

[0009]

The screw lock crown structure of the present invention is attached to a winding stem in a screw lock crown which can be locked by screwing a crown head onto a screw pipe fixed to a watch case. A crown pipe, which is attached to the crown head and is slidable in the axial direction in the screw pipe, is attached to the central shaft inserted into the screw pipe, and is deformably fitted to the crown pipe when the crown lock is released. Sometimes the odd-shaped fitting is released.

[0010]

In the screw lock crown mechanism of the present invention, the central shaft attached to the winding stem and the crown pipe attached to the crown head are configured to be deformed. That is, the modified portion is provided on the central axis, and the internally deformed portion is provided on the crown pipe, so that the crown is moved in the axial direction so that they are fitted and removed. Therefore, when screwing or unscrewing the crown head and the screw pipe, the crown head is locked in the axial direction or moved in the unlocking direction so that the crown head can be freely rotated in the rotation direction, or the crown is rotated. The head and the central axis can be rotated together.

[0011]

1 to 3 are sectional views of a screw lock crown structure according to an embodiment of the present invention in an unlocked state, an intermediate state and a locked state.

Reference numeral 2 is a screw pipe fixed to a hole provided in the body of the watch case by press fitting, brazing, welding or the like. A small diameter portion 2a from one end of the threaded pipe 2 to approximately the center is inserted and fixed in a hole of a watch case, and a threaded portion 2b is provided on the outer circumference of the other end.

Reference numeral 4 is a central shaft attached to the winding stem.
A screw hole 4a for attaching to the winding stem is provided at one end of the central shaft 4 in the axial direction from the end surface thereof.
Further, near the other end, a deformed portion 4b having an outer shape such as a hexagon is formed. Further, a large-diameter portion 4c adjacent to the deformed portion 4b is provided at the other end of the central shaft 4, and a projection 4d for positioning an elastic member described later is further provided from the end surface thereof. It is provided.

Reference numeral 6 denotes a crown head, one end surface of which is opened, and inside thereof, a screw portion 6a to be screwed into a screw portion 2b of the screw pipe 2 and a crown pipe to be described later are attached, and more than the screw portion 6a. A crown pipe mounting portion 6b having a small diameter and a recessed portion 6c for positioning an elastic member, which will be described later, are sequentially formed from the opening portion.

Reference numeral 8 is a crown pipe, and at one end thereof, a mounting portion 8a adapted to the crown pipe mounting portion 6b of the crown head 6 is provided, and the crown pipe mounting portion 6b is press-fitted, brazed, welded, etc. Fixed by. Further, inside the vicinity of the other end of the crown pipe 8, an internal shape which is adapted to the irregular shape portion 4b of the central shaft 4 and engages with the large diameter portion 4c is formed into an irregular shape such as a hexagon. A portion 8b is provided. The central shaft 4 described above is slidably inserted in the crown pipe 8, and the crown pipe 8 is slidably inserted in the screw pipe 2.

Reference numeral 10 denotes an elastic member composed of a coil spring, a rubber, a leaf spring, etc., one end of which is externally fitted to the projecting portion 4d of the central shaft 4 and the other end of which is fitted into the concave portion 6c of the crown head 6 for positioning. The central axis 4 and the crown head 6 are urged to separate them from each other in the axial direction.

Reference numerals 12 and 14 are O-rings for ensuring waterproofness. The O-ring 12 is housed in an annular recess 2c provided on the inner peripheral surface of the screw pipe 2, and the annular recess 2c
Is compressed between the inner surface and the outer peripheral surface of the crown pipe 8. The O-ring 14 is fitted on the crown pipe 8 and is arranged on the step 6d between the screw portion 6a of the crown head 6 and the crown pipe mounting portion 6b.
When the crown head 6 is screwed onto the screw pipe 2, the crown head 6 is compressed between the step portion 6d and the end surface of the screw pipe 2.

Next, the operation of the screw lock crown structure having the above structure will be described. First, in the unlocked state, as shown in FIG. 1, the elasticity of the elastic member 10 keeps the crown head 6 away from the central axis 4. At this time, the internal deformed portion 8b of the crown pipe 8 is
The deformed portion 4b of the central shaft 4 is deformably fitted, and the central shaft 4
The crown pipe 8 is prevented from coming off the screw pipe 2 by engaging with the large-diameter portion 4c. When the crown head 6 is rotated in this state, the central shaft 4 rotates together with the crown pipe 8, and the rotation is transmitted to the winding stem.

Here, as shown in FIG. 2, when the crown head 6 is pushed in the direction of the screw pipe 2 to be screwed onto the screw pipe 2, the crown head 6 and the crown pipe 8 slide in the screw pipe 2. And screw pipe 2
Before reaching the position where the threaded portion 2b of the crown head 6 and the threaded portion 6a of the crown head 6 can be screwed together, the irregular fitting of the internal deformed portion 8b of the crown pipe 8 and the deformed portion 4b of the central shaft 4 is released. Therefore, the crown head 6 becomes freely rotatable with the crown pipe 8.

Thereafter, as shown in FIG. 3, the crown head 6 is further pushed in to screw the threaded portion 6a thereof into the threaded portion 2b of the threaded pipe 2, and at this time, the internal deformed portion 8b of the crowned pipe 8 is already formed. Since the odd-shape fitting of the center shaft 4 with the odd-shape portion 4b is released, the crown head 6 should be lightly rotated until the screw portion 6a and the screw portion 2b of the screw pipe 2 are completely screwed and locked. You can
At this time, since the central shaft 4 does not rotate, the winding stem does not rotate.

In order to bring the crown head 6 in the locked state into the unlocked state again, it is sufficient to rotate the crown head 6 in the direction opposite to the locked state to release the fitting state of the screw portions 2b and 6a. . In this way, when the screw portion 6a of the crown head 6 comes off the screw portion 2b of the screw pipe 2,
The elasticity of the elastic member 10 which has been compressed until then pushes the crown head 6 back outward. Then, at this time, the inner deformed portion 8b of the crown pipe 8 and the deformed portion 4b of the central shaft 4 are deformed again to be rotated integrally. As shown in FIG. 4, in the present embodiment, when the internal deformed portion 8b and the deformed portion 4b are fitted to each other so that the inner deformed portion 8b and the deformed portion 4b can be easily fitted as described above. Guide slopes 4e and 8c are provided at the corners of the facing surfaces, respectively.

When the hands are adjusted, the crown head 6 which is unlocked as shown in FIG. 1 is further pulled out. At this time, the end portion of the inner deformed portion 8b of the crown pipe 8 engages with the large diameter portion 4c of the central shaft 4, and the central shaft 4 is also pulled out together with the pulling out of the crown head 6.
As a result, the winding stem to which the central shaft 4 is fixed is also pulled out, and the mechanism in the movement makes it possible to move the pointer by the rotation of the winding stem to perform needle alignment. At this time, since the deformed fitting state between the inner deformed portion 8b of the crown pipe 8 and the deformed portion 4b of the central shaft 4 is maintained, when the crown head 6 is rotated, the central shaft 4 is also rotated. By pushing in the crown head 6,
By the elastic member 10 in which the concave portion 6c of the crown head 6 and the protruding portion 4d of the central shaft 4 abut or intervene, the central shaft 4
Is pushed back together with the winding stem to return to the normal position, and by further releasing the hand, the crown head 6 moves the elastic member 10
To return to the state shown in FIG.

[0023]

According to the present invention, when the crown head is screwed onto the screw pipe and locked, the irregular fitting between the crown pipe and the central shaft is released and the crown head can be freely rotated. Therefore, the crown head can be easily screwed onto the screw pipe with a light operation.

Also, since the irregular fitting between the crown pipe and the central shaft is released by moving the crown head in the axial direction, when the crown head is screwed onto the screw pipe, the needle may be accidentally moved. The winding stem can be easily and surely screwed in without rolling or forcibly turning the winding stem.

Further, since the crown pipe and the central shaft are differently fitted to each other by the different shaped portions having the guide slopes, wear of the fitted portion is less than in the case of fitting with a screw or the like, and The fitting portion can be easily processed, and the increase in cost can be suppressed.

[Brief description of drawings]

FIG. 1 is a sectional view of a screw lock crown structure according to an embodiment of the present invention in an unlocked state.

FIG. 2 is a sectional view of the screw lock crown structure shown in FIG. 1 in an intermediate state.

FIG. 3 is a sectional view of the screw lock crown structure shown in FIG. 1 in a locked state.

4 is an enlarged cross-sectional view showing the deformed portion shown in FIG. 2 and the vicinity of the inner deformed portion.

[Explanation of symbols]

 2 screw pipe 2b screw part 4 central axis 4b deformed part 4c large diameter part 6 crown head 6a screw part 8 crown pipe 8b internal deformed part 10 elastic member

Claims (4)

[Claims] 1. A screw lock crown in which a crown can be locked by screwing a crown head onto a screw pipe fixed to a watch case, wherein a central shaft attached to a winding stem and inserted into the screw pipe is provided with: The crown pipe, which is attached to the crown head and is slidable in the axial direction in the screw pipe, is deformed when the crown is unlocked so that the crown pipe can be rotated integrally, and the variant fitting is released when the crown is locked. Screw lock crown structure 2. A threaded pipe fixed to a watch case and having a threaded portion on its outer peripheral surface, a crown head having a threaded portion on the inner peripheral surface that can be screwed into the threaded portion of the threaded pipe, and the threaded head fixed to a winding stem. A central shaft that is inserted into the threaded pipe and has a deformed portion on the outer peripheral surface, is fixed to the crown head, is slidably supported in the axial direction in the threaded pipe, and is slid in the unlocking direction to move the lock shaft. A crown pipe having an internal deformed portion that is deformedly fitted to the deformed portion of the central shaft and is slid in the locking direction to release the deformed fitting with the deformed portion of the central shaft. Screw lock crown structure. 3. The screw lock crown structure according to claim 1, further comprising an elastic member disposed inside the crown pipe and biasing the crown head outward. 4. A guide slope for facilitating fitting is provided on each of the surfaces facing each other when the deformed portion of the central shaft and the inner deformed portion of the crown pipe are fitted together.
Screw lock crown structure described.