JPH11210A - Watch band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the lowering of fitting strength and the influence of corrosion by adding stress pressing back a rear surface expanding part opposite to a groove-like recessed part at the outer peripheral of a fixing pin so as to form an expansion press- back part at the groove-like recessed part. SOLUTION: The diameter of the fixing pin 3 is made smaller than the inner piece through hole of an inner piece 2 to allow the inner piece 2 to freely rotate. The groove- like recessed part 31 making a position nearly similar to the side face of the inner piece 2 a start point is provided at the pin 3 projecting from the inner piece 2 and a fitting interference is provided at the inner diameter of an outer piece blind hole 11 to fit the pin 3 to the hole 11 to generate the rear surface expanding part 13 without the expansion press-back part 14 made by plastic deformation caused by the fitting interference at the rear surface of the outer piece 12. Pressing force is added to a part opposite to the groove-like recessed part 31 at the expansion part of the rear surface 13 to form the part 14. As the result of it, a blind hole inner periphery engaging part 15 is formed at the part 31 to engage the part 15 to the part 31. As pull-out stress is given in the axial direction of the pin 3 and fitting strength is evaluated by measuring force by which a fitting state is broken, as a fixing pin pull-out force, breakage is prevented in spite of the errosion of the fitting part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watch band connecting structure.

[0002]

2. Description of the Related Art In a conventional watch band connecting structure, the fitting strength is maintained only by a fitting allowance when a fixing pin is press-fitted into a blind hole of an outer piece. Therefore, the fitting strength due to the fitting allowance decreases with time due to creep deformation of the members, and the fitting state is often damaged. In addition, corrosion often occurs due to the influence of sweat or the like on the mutual contact surfaces in the fitted state, so that the fitting interference is reduced and the fitted state is often damaged.

[0003]

SUMMARY OF THE INVENTION The present invention has a problem in the prior art, namely, that the fitting strength due to the fitting allowance decreases with time due to creep deformation of the members, and the fitting state is damaged. The purpose of the present invention is to solve the problem that the mutual contact surfaces in the fitted state are corroded by the influence of sweat or the like, the fitting allowance is reduced, and the fitted state is damaged.

[0004]

Means for Solving the Problems A stress is applied to push back the swelling portion on the back surface of the portion opposite to the groove-shaped concave portion provided on the outer peripheral portion of the fixing pin, and a part of the inner peripheral portion of the blind hole of the outer piece is applied to the groove-shaped concave portion. Means for solving the problem is to form a bulging push-back portion to engage as a blind hole inner peripheral engaging portion. By engaging the blind hole inner peripheral engaging portion with the groove-shaped concave portion arranged on the outer peripheral portion of the fixing pin, the tip of the fixing pin is caught by the blind hole inner peripheral engaging portion from the groove-shaped concave portion, so that the fixing pin and the outer piece blind While increasing the fitting strength of the hole, the fitting strength is reduced by creep deformation of the mutual members over time, and the fitting state is damaged,
Corrosion occurs on the mutual contact surfaces in the fitted state due to the influence of sweat or the like, the fitting allowance is reduced, the fitted state is damaged, and the fixing pin 3 is damaged.
And the outer piece 1 are prevented from being separated.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. (Embodiment 1) The first embodiment will be described in detail with reference to FIG. The outer diameter of the fixing pin 3 was φ1.25 mm, and the inner piece through hole 21 of the inner piece 2 was φ1.30 mm so that the inner piece 2 could freely rotate. Fixing pin 3 protruding from inner piece 2
A groove-shaped concave portion 31 having a starting point substantially at the same position as the side surface of the outer piece is provided. The inner diameter of the outer piece blind hole 11 is φ1.21 mm, a fitting allowance is 0.04 mm.
To form a back surface swelling portion 13 without a swelling / returning portion 14 due to plastic deformation caused by a fitting allowance on the outer frame back surface 12. As a result of applying a pressing force to a portion of the rear surface bulging portion 13 opposite to the groove-shaped concave portion 31 and forming the swelling push-back portion 14, a blind hole inner peripheral engaging portion 15 is formed in the groove-shaped concave portion 31 and the groove-shaped concave portion 31 is formed. The blind hole inner peripheral engaging portion 15 was engaged. We apply a pull-out stress in the axial direction of the fixing pin 3 and use the force that breaks the fitted state as the fixing pin 3 pulling force in the evaluation of the fitting strength. Indicates 30 kg-f to 45 kg-f, and the actual value of the fixing pin 3 pulling force by the conventional method shown in FIG.
A remarkable effect was realized from -f to 20 kg-f.

In the conventional method shown in FIG. 3, when the fitting portion is forcibly corroded, the fitted state is easily damaged. However, according to this embodiment, the fitting portion is forcibly eroded. , The firmly fitted state was maintained. (Embodiment 2) A second embodiment will be described in detail with reference to FIG.

The difference from the first embodiment is that the groove-shaped recess 3 of the first embodiment is used.
The second embodiment is different from the first embodiment in that a groove-shaped concave portion 31 is provided at an intermediate position of the blind hole 11 of the outer frame, whereas the groove 1 is provided at a position starting from a position substantially the same as the side surface of the inner frame 2. Pin 3 and outer blind hole 11
Is the same as that of the first embodiment, but this second embodiment
When the projecting length of the fixing pin 3 protruding from the inner piece 2 is short, the outer diameter of the fixing pin 3 and the effective part of the fitting allowance of the outer piece blind hole 11 are arranged at the entrance of the outer piece blind hole 11. Further, it is possible to easily maintain the parallelism between the blind hole 11 of the outer piece and the fixing pin 3 in the axial direction. The fixing pin 3 pulling force according to the second embodiment, measured in the same manner as in the first embodiment, is about 5 kg-f lower than that of the embodiment, but exceeds the actual value of the fixing pin 3 pulling force according to the conventional method shown in FIG. Also, in the conventional method, when the fitting portion was forcibly corroded, the fitted state was easily damaged. However, according to the present embodiment, the fitting portion was forcibly removed as in the first embodiment. Even when corroded, a firm fit was maintained. In the first and second embodiments, the back surface swelling portion 13 and the swelling push-back portion 14 are removed by grinding the portion shown by broken lines on the entire back surface portion in FIGS. 1 and 2.
A flat band back was obtained.

[0008]

According to this embodiment, the force required to remove the fixing pin 3 is 3
From 0 kg-f to 45 kg-f, a remarkable effect is realized in comparison with the actual value of the fixing pin 3 pulling force of 10 kg-f to 20 kg-f by the conventional method shown in FIG. In the conventional method shown in the figure, when the fitting portion is forcibly corroded, the fitted state is easily broken. However, according to this embodiment, even when the fitting portion is forcibly corroded, a firm fit is obtained. As a result, the fixing pin 3
Since the fitting strength is maintained only depending on the fitting allowance at the time of press-fitting, the fitting strength due to the fitting allowance decreases over time due to creep deformation of the members, and the fitted state. It is said that the problem that the fitting state is often reduced due to corrosion due to sweat or the like on the mutual contact surfaces in the fitted state due to the influence of sweat etc. Provided effect.

[Brief description of the drawings]

FIG. 1 is a partially assembled sectional view showing a structure of a fixing pin, an outer piece and an inner piece described in Embodiment 1 of the present invention.

FIG. 2 is a partially assembled sectional view showing a structure of a fixing pin, an outer piece and an inner piece described in a second embodiment of the present invention.

FIG. 3 is a partially assembled sectional view showing the structure of a conventional fixing pin and outer and inner blocks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer piece 11 Outer piece blind hole 12 Outer piece back surface 13 Back surface swelling part 14 Swelling pushback part 15 Blind hole inner circumference engaging part 2 Inner piece 21 Inner piece through hole 3 Fixing pin 31 Groove recess

Claims (1)

[Claims] 1. Both ends of a fixing pin, which penetrates a hole of an inner piece disposed inside an outer piece and protrudes at both ends of the width of the inner piece, are pressed into blind holes opened from the inside of the outer piece located on both outer sides of the inner piece. In a watch band in which a pair of band pieces that are fitted together are continuously connected, a groove-like concave portion is provided on an outer peripheral portion of a portion protruding at both ends of the width of the inner piece of the fixing pin, and a blind hole of the outer piece is provided. When the fixing pin is press-fitted into the outer piece, bulging due to plastic deformation caused by the fitting allowance occurs on the back surface of the outer piece, and after press-fitting,
A stress is applied to push back the swelling of the portion bulging due to the plastic deformation, which is opposed to the groove-like concave portion arranged on the outer peripheral portion of the fixing pin, and a part of the inner peripheral portion of the blind hole of the outer piece is engaged with the groove-like concave portion. Watch band characterized by having been made.