JP2988854B2 - Watch hands prevention 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 timepiece with which a pointer is prevented from falling off when the pointer is attached to a pointer pipe.

[0002]

2. Description of the Related Art In a timepiece, as shown in FIG. 6, a pointer 2 such as an hour hand or a minute hand is mounted on a pointer pipe 1. The mounting structure of the pointer on the pointer pipe is generally (1) shown in FIG. As shown in FIG. 1, a cylindrical portion 3 is formed on the base portion of the metallic pointer 2 by pressing the flat portion of the pointer in the punching direction by press punching (a so-called burring sword). Press-in, (2) As shown in FIG.
Between the pointer pipe 1 and the through hole 4 of the pointer 2 attached thereto, a metal flanged cylinder 5 called a "hakama" is attached,
It is known that the pointer 2 is fixed to the pointer pipe 1 through the flanged cylinder 5 by caulking the lower side of the flange of the cylinder 5. Reference numeral 6 denotes a caulking portion.

[0003]

The above-mentioned conventional pointer mounting structure has the following disadvantages.

[0004] That is, recently, timepieces have been increasingly made of resin from the viewpoint of weight reduction and ease of manufacture, and the pointer pipe tends to be formed of resin. On the other hand, burring swords and hakama are still made of metal because burring or crimping is required to be made of metal. (Indicators and hakama). Resin and metal have a remarkable difference in the coefficient of thermal expansion, so especially in a watch used in a low-temperature environment, the shrinkage of the resin with respect to the metal increases, so the diameter of the resin-made pointer pipe decreases.
A phenomenon has occurred in which the metal pointer and hakama detached. Incidentally, one watch is often used in a range of about + 70 ° C. to about −30 ° C., and in such a case, the detachment phenomenon is remarkable.

[0005] In this respect, in the case of using a hakama, a structure in which the outer periphery of the hakama is screwed toward the pointer pipe is sometimes seen. However, in the case of this structure, since the pointer pipe is pressed by the tip of the screw, the screwing effect is lost if the screw is loosened even a little.

The present invention has been made in view of the above circumstances, and in the case of using the above-mentioned metal hakama, it is possible to reliably prevent the pointer from coming off when the pointer is attached to the pointer pipe. The present invention proposes a structure for preventing a watch from slipping off a pointer.

[0007]

According to a first aspect of the present invention, a flanged cylinder is fitted into a through hole provided in a base portion of a pointer, and the flanged cylinder is mounted on a pointer pipe. In a timepiece having a structure that is fixed to a pointer pipe via the flanged cylinder, the flanged cylinder is formed of metal, and a hole that partially opens from the flange side of the cylinder along a cylindrical inner peripheral surface is formed. It is a structure for preventing the needle from coming off, wherein a metal key member protruding from an opening of the hole is inserted into the hole of the flanged cylinder attached to the pointer pipe.

Therefore, according to the first aspect of the present invention,
The hole formed in the flanged cylinder has an opening formed along the inner peripheral surface of the cylinder, that is, in parallel with the axis of the cylinder. The side part is pressed against the pointer pipe. Therefore, since this pressure contact is a surface contact having at least a certain width, the engagement between the flanged cylinder and the pointer pipe is ensured. The cylinder and the key member are made of metal, and the key member reliably protrudes from the opening of the hole and presses the pointer pipe at the protruding portion, so that the effect of preventing the pointer from coming off is sufficiently achieved. .

According to a second aspect of the present invention, in the first aspect, a tapping screw is screwed into the hole of the flanged cylinder, and the tapping screw is screwed inward from an inner peripheral surface of the cylinder. An outer peripheral portion protrudes, and the outer peripheral portion of the screw is configured to engage with the pointer pipe to prevent the pointer from coming off.

Therefore, according to the second aspect of the present invention,
Since the key member is a tapping screw, which is screwed, the tapping screw is formed in the hole along with the screwing. On the other hand, the tapping screw has a screw outer peripheral portion projecting inward from the inner peripheral surface of the cylinder. Since the outer peripheral portion is engaged with the pointer pipe, the effect of preventing the pointer from coming off by the key member is further achieved.

According to a third aspect of the present invention, in the first aspect, a female screw portion is formed in the hole of the flanged cylinder,
A screw screwed with the female screw portion is screwed into the hole, and the screw has an outer peripheral portion projecting inward from the inner peripheral surface of the cylinder, and the outer peripheral portion of the screw is engaged with the pointer pipe. This is a structure for preventing the pointer from coming off.

Therefore, according to the third aspect of the present invention,
A female screw portion is formed in the hole in advance, and a screw to be screwed with the female screw portion is screwed into this hole, so that the engagement between the screw and the hole is more reliable than a tapping screw. As for the point where the outer peripheral portion of the screw is engaged with the pointer pipe, a sufficient effect of preventing the pointer from coming off is exhibited, as in the case of the tapping screw.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the structure for preventing the pointer from slipping out shown in these figures is such that a flanged cylinder 10 is fitted into a through hole 4 provided at the base of the metal pointer 2, and The cylinder 10 is attached to the pointer pipe 1 made of resin, and the pointer 2 is fixed to the pointer pipe 1 through the flanged cylinder 10. The flanged cylinder 10 is, as described above, a "hakama".
It is a metal member called.

The cylinder 10 has a flange 11 integrally formed on the upper surface, and a hole 13 partially open along the cylindrical inner peripheral surface 12 from the flange 11 side. That is, this hole 1
Numeral 3 is formed parallel to the axis of the cylinder 10, and as described above, a part thereof is opened. In this case, the hole 13 is formed by a drilling tool such as a drill or a reamer. At this time, the dimension from the inner peripheral surface 12 of the cylinder 10 to the center of the hole is set to a dimension smaller than the drilling radius. Do. In this example, as shown in FIG. 3, a hole 13 is formed at a position where the intersection of the imaginary lines drawn from the center of the hole to the points where the hole 13 contacts the inner peripheral surface 12 becomes 120 °. Is formed.

Furthermore, in this example, a metal key member 21 having a cylindrical lower portion and a conical protrusion is inserted into the hole 13 (see FIG. 2). Insertion of this key member 21
The outer peripheral portion of the member 21 is of such a size as to perform sufficient pressure bonding for locking the pointer pipe 1 (so-called press-fitting).

In the example shown in FIGS. 1 to 3, the cylinder 1
The press-fit hole 4 of the pointer 2 is press-fitted from below. This press-fitting is performed until the pointer 2 contacts the lower surface of the flange 11. In that state,
The cylinder 10 is fitted to the pointer pipe 1, and the key member 21 is pressed into the hole 13 of the cylinder 10. The pointer 2 and the flanged cylinder 10 are made of metal, and the mounting of both is press-fitting and maintains a good fixed state without being affected by a temperature change. On the other hand, the pointer pipe 1 is made of resin and is affected by a change in temperature, and shrinks particularly at a low temperature, so that the so-called hakama is detached from the pointer pipe in a normal case. Since the member 21 is press-fitted and the outer peripheral portion of the key member 21 protrudes from the opening of the hole 13 toward the pointer pipe 1, the projected portion presses the pointer pipe 1, and as a result, the pointer is prevented from coming off. Is exhibited.

FIG. 4 shows another embodiment of the present invention. In this embodiment, as in the previous embodiment, the cylinder 10 is
A flange 11 is integrally formed on the upper surface, and a hole 13 is formed from the side of the flange 11 along the cylindrical inner peripheral surface 12 so as to partially open. In the example shown in FIG.
3 is screwed with a tapping screw 22. Tapping screw 2
2 is threaded on the inner peripheral surface of the hole 13 by screwing into the hole 13. Further, the tapping screw 22 has a screw outer peripheral portion protruding inside the cylindrical inner peripheral surface 12, and the screw outer peripheral portion is engaged with the pointer pipe 1.

As described above, according to the example shown in FIG. 4, the key member is the tapping screw 22, which is screwed, so that the tapping screw 22 is formed in the hole 13 with the screwing. The screw has an outer peripheral portion projecting inward from the inner peripheral surface of the cylinder, and the outer peripheral portion of the screw is engaged with the pointer pipe 1. Therefore, the effect of preventing the pointer from coming off by the key member is further achieved. That is, since a plurality of screw grooves which are different from each other by approximately 90 ° in the direction in which the cylinder 10 comes out are provided on the outer circumference of the pointer pipe 1, the grooves on the outer circumference of the pointer pipe 1 and the screws of the tapping screws 22 are locked, and The detachment of the hakama will be further prevented.

FIG. 5 shows another embodiment of the present invention. In this embodiment, as in the previous embodiment, the cylinder 10 is
A flange 11 is integrally formed on the upper surface, and a hole 13 is formed from the side of the flange 11 along the cylindrical inner peripheral surface 12 so as to partially open. In the example shown in FIG.
3, a female screw portion 13a is formed, and a screw 23 screwed with the female screw portion 13a is screwed into the hole 13. When the screw 23 is screwed into the hole 13, the screw outer peripheral portion protrudes inward from the cylindrical inner peripheral surface 12, and the screw outer peripheral portion is engaged with the pointer pipe 1.

As described above, according to the example shown in FIG. 5, as in the previous example, a plurality of screw grooves which are different from each other by approximately 90 ° in the direction in which the cylinder 10 comes out are provided on the outer circumference of the pointer pipe 1. The groove and the screw 23 are locked, and the detachment of the hakama from the pointer pipe is further prevented.

In each of the illustrated examples, the pointer 2 is simply described. However, the present invention can be applied to an appropriate pointer such as an hour hand, a minute hand, a second hand, and a guide hand.

[0023]

As described above, according to the first aspect of the present invention, the hole formed in the flanged cylinder is partially opened along the inner peripheral surface of the cylinder. The key member to be inserted has its side surface in the member longitudinal direction pressed against the pointer pipe, and therefore, this pressure contact is a surface contact with at least a certain width, so that the engagement between the flanged cylinder and the pointer pipe is established. It will be sure. The cylinder and the key member are made of metal, and the key member reliably protrudes from the opening of the hole and presses the pointer pipe at the protruding portion, so that the effect of preventing the pointer from coming off is sufficiently achieved. .

According to a second aspect of the present invention, since the key member is a tapping screw, which is screwed, a tapping screw is formed in the hole as the screw is screwed. Since the outer peripheral portion of the screw projects further inward and the outer peripheral portion of the screw engages with the pointer pipe, the effect of preventing the pointer from coming off by the key member is further achieved.

According to a third aspect of the present invention, a female screw portion is formed in the hole in advance, and a screw screwed with the female screw portion is screwed into the hole. Is more reliable than in the case of As for the point where the outer peripheral portion of the screw is engaged with the pointer pipe, a sufficient effect of preventing the pointer from coming off is exhibited, as in the case of the tapping screw.

As described above, according to the present invention, in the case where a metal hakama is used, when attaching the hands to the pointer pipe, the hands can be securely prevented from coming off. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a pointer and a flanged cylinder according to the present invention, wherein (1) is a plan view, (2) is a cross-sectional view, and (3) is a cross-sectional view in a state attached to a pointer pipe. .

FIG. 2 is a cross-sectional view showing a state in which a flanged cylinder having a pointer attached thereto is attached to a pointer pipe according to the present invention.

FIG. 3 is a plan view showing a state in which a hole is formed in a flanged cylinder according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which a flanged cylinder having a pointer attached thereto is attached to a pointer pipe according to the present invention.

FIG. 5 is a cross-sectional view showing a state in which a flanged cylinder having a pointer attached thereto is attached to a pointer pipe according to the present invention.

FIG. 6 is a perspective view showing a state where the pointer is attached to the pointer pipe.

FIG. 7 is a cross-sectional view showing a state where a burring sword is attached to a pointer pipe according to a conventional example.

FIG. 8 is a cross-sectional view showing a state where a hakama with a pointer attached thereto is attached to a pointer pipe according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pointer pipe 2 pointer 3 cylindrical part 4 through-hole 5 cylinder 6 crimping part 10 flanged cylinder 11 flange 12 cylindrical inner peripheral surface 13 hole 13a female screw part 21 key member 22 tapping screw 23 screw

Claims (3)

(57) [Claims] 1. A structure in which a flanged cylinder is fitted into a through hole provided in a base of a pointer, the flanged cylinder is mounted on a pointer pipe, and the pointer is fixed to the pointer pipe via the flanged cylinder. In the timepiece described above, the flanged cylinder is formed of metal, and a hole is formed in the cylinder, the hole being partially open from the flange side of the cylinder along the inner peripheral surface of the cylinder. And a metal key member protruding from an opening of the hole is inserted into the hole of the attached cylinder. 2. A tapping screw is screwed into the hole of the flanged cylinder, wherein the tapping screw has a screw outer peripheral portion projecting inward from an inner peripheral surface of the cylinder, and the screw outer peripheral portion is connected to a pointer pipe. The structure for preventing a pointer from coming off according to claim 1, wherein the pointer is engaged. 3. A female screw portion is formed in the hole of the flanged cylinder, and a screw to be screwed with the female screw portion is screwed into this hole, wherein the screw is inside the cylindrical inner peripheral surface. 2. The structure as claimed in claim 1, wherein the outer peripheral portion of the screw protrudes and the outer peripheral portion of the screw is engaged with the pointer pipe.