JP2999402B2 - Clock gear structure - Google Patents

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 for attaching a hand such as a minute hand of a timepiece, and to a structure capable of changing the length of a pipe portion for attaching the hand.

[0002]

2. Description of the Related Art Heretofore, it has been necessary to change the length of a pipe to which a pointer is attached to a gear for attaching a pointer such as a minute hand wheel according to a difference in a position at which a pointer of various timepieces is attached. For this reason, conventionally, several types of gears having different pipe lengths have been prepared.
As disclosed in Japanese Patent Publication No. 8 (1994), it has been proposed to prepare a pointer pipe and several types 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. Was.

[0003]

In the above conventional example, only one kind of pointer pipe is required, but several kinds of pointer pipe bushes must be prepared, and a mold is provided for each pointer pipe bush. And it was difficult to reduce costs.

[0004] In addition, there is a problem that parts management becomes complicated because many kinds of pointer pipe bushes must be prepared.

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

[0006]

A gear structure of a timepiece according to the present invention comprises a pointer pipe bush and a pointer pipe which communicate with each other by being fitted together, and a plurality of pointer pipe bushes and a pointer pipe are provided at one of the fitting portions. A first fitting portion is provided, and the other is provided with one or more second fitting portions fitting with the first fitting portion, and fitting between the second fitting portion and the plurality of first fitting portions is provided. By changing the position, the length of the pipe can be changed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gear structure of a timepiece according to the present invention comprises a pointer pipe bush and a pointer pipe, and one and the other thereof are provided with a convex portion and a concave portion which can be fitted respectively. Since this recess is formed at several places in the axial direction,
The length of the pipe portion in the axial direction can be changed depending on the fitting portion between the convex portion and the concave portion.

[0008]

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

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

In FIG. 2, a pointer pipe bush 8 has a fitting portion 10 having an outer diameter capable of fitting into the pipe portion 6 of the pointer pipe 2, a pointer portion having substantially the same outer diameter 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 first to third concave portions 10a to 10c are formed on the outer peripheral surface of the fitting portion 10 as first fitting portions formed to form an annular shape or a partially interrupted annular shape along the outer circumferential surface. Have been. The first to third concave portions 10a to 10c
Are formed side by side in the axial direction, and each is formed in a size and a shape that can be fitted to 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 figure, 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. In the state shown in the figure, the convex portion 6a and the first
In this state, 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 the shortest.

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

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

The projection 6a and the first to third recesses 10
If any one of a to 10c is formed, the other may be singular or plural.

Further, the convex portion 6a and the first to third concave portions 10
When both a to 10c are formed in a ring shape, depending on the fitting state, rotation of each other is suppressed and they are integrated. It is necessary to form the third concave portions 10a to 10c so as to form an interrupted ring.

[0016]

According to the present invention, it is possible to form a gear for mounting a plurality of hands having different pipe lengths by merely preparing one kind of pointer pipe and a pointer pipe bush. Accordingly, the die only needs to be raised only for the pointer pipe and the pointer pipe bush, so that the manufacturing cost can be reduced.

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

[Brief description of the drawings]

FIG. 1 is a sectional view showing a pointer pipe in a gear structure of a timepiece 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 one embodiment of the present invention.

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

4 is a cross-sectional view showing a state in which the fitting position between the pointer pipe and the pointer pipe bush shown in FIG. 3 is changed.

FIG. 5 is a cross-sectional view showing a state where the fitting position between the pointer pipe and the pointer pipe bush shown in FIG. 3 is further changed.

[Explanation of symbols]

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

Claims (2)

(57) [Claims] A pointer pipe bush and a pointer pipe which are communicated by being fitted are provided. A plurality of first fitting portions are provided in one of fitting portions of the pointer pipe bush and the pointer pipe, and the first fitting portion is provided in the other. One or more second fittings fitted to the fitting portion
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 the plurality of first fitting portions. 2. The apparatus according to claim 1, wherein said first fitting portion and said second fitting portion are both formed so as to form a partially interrupted annular shape along the peripheral surface of said pointer pipe bush and said pointer pipe. The timepiece gear structure according to claim 1, wherein: