JPH0980168A - Gear structure for clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear structure for a clock which reduce the number of components, reduces the cost and simplifies the component management. SOLUTION: The gear structure for a clock comprises a pointer pipe bush 8 and a pointer pipe 2, wherein a protrusion 6a and recesses 10a to 10c which can be engaged with one and the other are provided. Since the recesses are formed axially at several positions, the axial height of the pipe can be altered by the engaging positions of the protrusion and the recesses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a gear to which a pointer such as a minute hand of a timepiece is attached and a pipe portion to which the pointer is attached can be changed in length.

[0002]

2. Description of the Related Art Conventionally, it has been necessary to change the length of a pipe portion to which a pointer is attached to a gear to which a pointer of a minute hand wheel or the like is attached in accordance with a difference in a mounting position of the pointer of various watches. For this reason, in the past, several types of gears with different lengths of pipes were prepared.
As disclosed in Japanese Patent No. 8, it has been proposed to prepare a pointer pipe and several kinds of pointer pipe bushes each having a different length, and to change the length of the pipe portion by replacing only the pointer pipe bush. It was

[0003]

In the above-mentioned conventional example, it is sufficient to prepare one kind of pointer pipe, but it is necessary to prepare many kinds of pointer pipe bushes, and a die is provided for each pointer pipe bush. It was necessary to wake it up, and it was difficult to reduce costs.

Further, since it is necessary to prepare many kinds of pointer pipe bushes, there is a problem that parts management becomes complicated.

The present invention has been made in view of the above problems, and an object thereof is to provide a gear structure for a timepiece in which the number of parts is reduced, the cost is reduced, and the parts management is simple.

[0006]

The gear structure of the timepiece of the present invention comprises a pointer pipe bush and a pointer pipe which are communicated by fitting, and a plurality of pointer pipe bushes and one of the fitting portions of the pointer pipe are provided. A first fitting portion is provided, and a single or a plurality of second fitting portions that fit to the first fitting portion are provided on the other side, and the second fitting portion and the plurality of first fitting portions are fitted together. The length of the pipe can be changed by changing the position.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The gear structure of a timepiece according to the present invention comprises a pointer pipe bush and a pointer pipe, each of which is provided with a convex portion and a concave portion that can be fitted into the other. Since this recess is formed at several locations in the axial direction,
The length of the pipe portion in the axial direction can be changed by the fitting position of the convex portion and the concave portion.

[0008]

1 is a sectional view showing a pointer pipe in a timepiece gear structure according to an embodiment of the present invention, and FIG. 2 is a partial sectional view showing a pointer pipe bush in a timepiece gear structure according to an embodiment of the present invention. It is a figure.

In FIG. 1, the pointer pipe 2 has a gear portion 4
And a pipe portion 6, and a convex portion 6a as a second fitting portion is provided on the inner peripheral surface at the tip of the pipe portion 6. In this embodiment, the convex portion 6a is formed to have an annular shape or a partially interrupted annular shape along the inner peripheral surface of the pipe portion 6a.

In FIG. 2, the pointer pipe bush 8 has a fitting portion 10 having an outer diameter capable of being fitted into the pipe portion 6 of the pointer pipe 2, an outer diameter substantially the same as the pipe portion 6 of the pointer pipe 2, and a pointer. Pointer mounting part 1 to which is attached
And 2. This pointer pipe bush 8
The outer peripheral surface of the fitting portion 10 is provided with first to third recesses 10a to 10c as a first fitting portion formed in an annular shape or a partially interrupted annular shape along the outer peripheral surface. Has been. The first to third recesses 10a to 10c
Are formed side by side in the axial direction, and each is formed in a size and shape that can be fitted into the convex portion 6a of the pipe portion 6 of the pointer pipe 2 described above.

FIG. 3 is a sectional view showing a state in which the pointer pipe 2 and the pointer pipe bush 8 shown in FIGS. 1 and 2 are fitted. As shown in the drawing, the pointer pipe 2 and the pointer pipe bush 8 are fitted by fitting the fitting portion 10 of the pointer pipe bush 8 into the pipe portion 6 of the pointer pipe 2. Then, in the illustrated state, the convex portion 6a and the first
In this state, the sum of the length of the pipe portion, that is, the sum of the lengths of the pointer pipe 2 and the pointer pipe bush 8 is shortest.

Further, as shown in FIG. 4, the convex portion 6a and the second
The length of the pipe portion becomes longer when it is fitted into the concave portion 10b of the pipe, and the length of the pipe portion becomes the largest when the convex portion 6a and the third concave portion 10c are fitted as shown in FIG. It will be long.

In the present embodiment, the pointer pipe 2 is provided with the convex portion 6a and the pointer pipe bush 8 is provided with the first to third concave portions 10a to 10c. The first to third recesses 10a to 10c may be provided and the pointer pipe bush 8 may be provided with the projection 6a.

Further, the convex portion 6a and the first to third concave portions 10 are formed.
If any one of a to c is formed in plural, the other may be singular or plural.

Further, the convex portion 6a and the first to third concave portions 10 are formed.
When both a to 10c are formed in an annular shape, their mutual rotation is suppressed depending on the fitted state and they are integrated, but in order to more surely stop their mutual rotation and be integrated, the convex portion 6a and the first to sixth portions are used. It is necessary to form the third recesses 10a to 10c so as to form a discontinuous annular shape.

[0016]

According to the present invention, it is possible to form a gear to which a plurality of pointers having different lengths of pipe portions are attached by preparing only one kind of pointer pipe and pointer pipe bush. Therefore, since it is sufficient to raise the die only for the pointer pipe and the pointer pipe bush, the manufacturing cost can be reduced.

Further, the number of parts is two, that is, the pointer pipe and the pointer pipe bush, and management thereof is extremely easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a pointer pipe in a timepiece gear structure according to an embodiment of the present invention.

FIG. 2 is a partial sectional view showing a pointer pipe bush in the gear structure of the timepiece according to the embodiment of the invention.

FIG. 3 is a cross-sectional view showing a state in which the pointer pipe and the pointer pipe bush shown in FIGS. 1 and 2 are fitted together.

FIG. 4 is a cross-sectional view showing a state where the fitting positions of the pointer pipe and the pointer pipe bush shown in FIG. 3 are changed.

5 is a cross-sectional view showing a state in which the fitting positions of the pointer pipe and the pointer pipe bush shown in FIG. 3 are further changed.

[Explanation of symbols]

 2 pointer pipe 4 gear part 6 pipe part 6a convex part 8 pointer pipe bush 10 fitting part 10a to 10c first to third concave part 12 pointer mounting part

Claims (2)

[Claims] 1. A pointer pipe bush and a pointer pipe which communicate with each other by being fitted together. One of the fitting portions of the pointer pipe bush and the pointer pipe is provided with a plurality of first fitting portions, and the other is fitted with the first fitting portion. A single or multiple second fitting to the fitting part
A gear structure for a timepiece, wherein a fitting portion is provided, and a length of a pipe portion can be changed by changing a fitting position between the second fitting portion and a plurality of first fitting portions. 2. The first fitting portion and the second fitting portion are both formed so as to form a partially interrupted annular shape along the peripheral surface of the pointer pipe bush and the pointer pipe. The gear structure for a timepiece according to claim 1, which is characterized in that.