JP2000292281A - Tool and method for determining fixation force of connection pin in watch band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool for accurately determining the fixation force of a connection pin in a watch band easily and without personal difference. SOLUTION: The determination tool is provided with a cylindrical body 10, a slide shaft 21 that is mounted in an axial direction inside a body so that it can travel, a press pin 13 that is mounted to one end of the shaft, and a spring 23 that is accommodated in the body and biases the other end of the shaft into an axial direction. The tool is also provided with locking pieces 23 and 26 for preventing the shaft part from being unlocked from the body at a position where the press pin 13 projects from one end of the body due to the spring, thus the fixation force of the connection pin of a watch band can be determined by pressing the press pin to the end part of the connection pin of the watch band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting pin fixing force determining tool for a wristwatch band.

[0002]

2. Description of the Related Art Conventionally, as a connecting pin for connecting pieces of a wristwatch band, a metal connecting pin called a hairpin, which is bent in a substantially U shape and has a spring property, has been widely used. I have. The connecting pin is inserted into a connecting hole communicating two adjacent pieces, and is fixed in the connecting hole by elastically pressing against the inner wall of the hole. In such a connection structure, a minute difference in dimensions between the pin and the connection hole affects the fixing force, and may not have a predetermined fixing force. Therefore, it is necessary to determine the fixing force. FIG. 12 shows a conventional determination method. The determination method will be described below. As shown in FIG. 12, a pedestal 4 on which a push pin 3 is erected is fixed on a tray 2 of a weighing machine 1. Next, the band 5 is held in both hands, the lower end of the connecting pin 6 is applied to the upper end of the push pin 3, and the band is pushed down toward the platform scale. When the connecting pin 6 is detached from the band piece 7, the scale indicated by the platform scale 1 is read. The value is recorded as the fixing force between the connecting pin and the piece. If the fixing force has reached a predetermined target value, it is determined that the product is good.

[0003]

Since it is not known when the connecting pin will pop out, the scale of the platform scale 1 must be read while pressing the band, and the operation is complicated. In particular,
An unskilled person may not be able to read the measurement value of the platform scale accurately. Furthermore, it is easy to hit the band on the tray of the platform scale,
Often the band is hurt.

Accordingly, an object of the present invention is to provide a judgment tool which can easily judge whether the connection pin is fixed or defective with respect to the fixing force between the link pin and the piece. Another object of the present invention is to provide a judgment tool that can be accurately judged even by an unskilled person. Still another object is to provide a judgment tool which does not damage the band.

[0005]

According to the first aspect of the present invention,
A cylindrical main body, a sliding shaft mounted movably in the axial direction inside the main body, a push pin mounted at one end of the shaft, and a spring housed inside the main body to bias the other end of the shaft in the axial direction And a retaining means for preventing the shaft from being pulled out of the main body at a position where the push pin protrudes from one end of the main body by a spring. The fixing force of the connecting pin is determined. When the push pin is pressed against the end of the connection pin of the wristwatch band, the push pin moves toward the inside of the main body against the elastic force of the spring. Thus, for example, by observing whether or not the connecting pin comes off from the band, it can be determined whether or not the fixing force of the connecting pin to the band satisfies a predetermined value.

[0006] The invention according to claim 2 is characterized in that a cap is mounted on the main body so as to be movable along the axial direction, and the push pin can be immersed therein. By moving the cap, it is possible to determine the length of the distance (stroke of the push pin) until the push pin enters the cap against the elastic force.
Thereby, the force with which the push pin presses the connecting pin can be adjusted.

The invention according to claim 3 is characterized in that the protection cylinder is made of a soft material so that the push pin passes therethrough. When the push pin is pressed against the end of the connecting pin, the protective cylinder and the band are softly touched, so that the risk of damaging the band is eliminated.

[0008] The invention according to claim 4 is characterized in that the protection cylinder is attached to the tip of the cap. The invention according to claim 5 is characterized in that the push pin can be stored inside the cap by moving the cap. When the judging tool is not used, if the push pin is stored inside the cap, the push pin can be prevented from being bent or bent.

[0009] The invention according to claim 6 is characterized in that a flat portion for preventing the judgment tool from rolling is formed on the outer periphery of the cap. If it is placed on a workbench or the like with the flat part facing down, the judgment tool will not accidentally roll. Since the operator can easily take the judgment tool, the work efficiency is improved, and the danger of the judgment tool dropping from the worktable and being damaged can be eliminated.

[0010] The invention according to claim 7 is characterized in that an adjusting screw is provided, which abuts on the spring opposite to the other end of the shaft and is movably attached along the axial direction. The spring can be bent by moving the adjusting screw toward the other end of the shaft. Thereby, the elastic force of the spring can be adjusted, and the force with which the push pin presses the connecting pin can be adjusted.

The invention according to claim 8 is characterized in that the adjusting screw can be immersed inside the main body. Since an external force is not easily applied to the adjusting screw, the adjusting screw does not move carelessly. Therefore, the danger that the elastic force of the spring is inadvertently changed can be eliminated.

The invention according to claim 9 is characterized in that a push pin is erected on a pin mounting member screwed to a shaft. When the push pin is broken or bent, the push pin can be easily replaced.

[0013]

Embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of a judgment tool according to an embodiment of the present invention, FIG. 2 is a cross-sectional view, FIG. 3 is a cross-sectional view showing a state where a push pin is pushed in, and FIG. 4 is an exploded plan view. As shown in FIG. 1, a judgment tool according to the present invention has a cylindrical main body 10.
A cap 11 screwed to the main body;
And a push pin 13. A knurl in the axial direction is engraved on the main body 10 and the cap 11 so that they do not slip in the hand. The cap 11 has a flat portion 14.
Is formed, and this part is prevented from rolling when the part is placed on a desk.

As shown in FIG. 2, in the main body 10, a large-diameter hole 15 is formed at the base in the axial direction at the base and a small-diameter hole 16 is formed at the tip. The cap 11 has a threaded portion 17,
18 (FIG. 4), it is attached to the main body so as to be movable in the axial direction. The small diameter hole 1 of the main body is
A hole 19 having the same diameter as 6 is formed. The tip of the cap 11 is tapered in a conical shape, and a protective tube 12 made of plastic is fixed to the hole 20 at the tip with an adhesive.

A sliding shaft 21 is inserted across the holes 15, 16 and 19 so as to be slidable in the axial direction.
The sliding shaft 21 has a flange 22. A coil spring 23 as an urging means is inserted into the large diameter hole 15. The adjusting screw 25 is screwed into the screw hole 24 at the rear end of the main body, and pushes the spring 23. Therefore, the flange 22 is large and small diameter hole 1
5 and 16 are pressed against the step portions 26. Flange 22 and step 2
The contact of 6 achieves a retaining means for preventing the sliding shaft 21 from being pulled out of the main body 10. At the tip of the shaft 21, a pin mounting member 27 in which the push pin 13 is press-fitted and fixed is provided with a thread portion 2.
8 and the push pin 13 is
More protruding.

With the above structure, when an axial force is applied to the push pin 13 as shown by an arrow in FIG. 3 and the pressing force exceeds the set elastic force of the spring 23, the spring is compressed. Then, the shaft 21 moves and the push pin 1
3 is immersed in the protection cylinder 12. In the present invention, the pressing force on the push pin is configured to correspond to the fixing force of the band connecting pin. Next, a method of adjusting the spring will be described. First, as shown in FIG. 5, the judgment tool is made perpendicular to the tray 32 of the platform scale 31 and the push pin 13 is applied. Next, the judgment tool is pressed against the receiving tray 32 until the push pin is immersed in the cap 11. Then, the pressing force on the push pin is adjusted so that the scale of the platform scale becomes a predetermined target value. This adjustment can be made by the movement of the adjustment screw 25 and the length of the stroke S (FIG. 7) of the push pin 13 due to the movement of the cap 11. That is, a hexagonal hole 3 is provided at the end of the adjusting screw 25.
3 (Fig. 10), insert a hexagon wrench into the
Turn to change the spring characteristics. When the adjusting screw 25 is moved toward the other end of the shaft 21, the spring 2 serving as an urging means is moved.
3 is flexed strongly. Therefore, the elastic force of the spring 23 increases. Then, the pressing force required to cause the pin 13 to enter the protection cylinder 12 against the elastic force of the spring 23 also increases. Conversely, when the adjustment screw 25 is moved in a direction away from the shaft 21, the elastic force of the spring 23 is reduced, and the pressing force applied can be reduced. Further, the stroke S can be changed by rotating and moving the cap 11. When the cap 11 is moved toward the release end of the push pin 13, the pin 13
The distance (stroke) required to be immersed in the protective cylinder 12 against the elastic force of the above becomes shorter. Therefore, the pressing force required to immerse the pin 13 into the protective cylinder 12 against the elastic force of the spring 23 is also reduced. Conversely, cap 11
Is moved in a direction away from the release end of the push pin 13, the immersion distance (stroke) of the pin 13 becomes longer. Therefore, a large pressing force is required to immerse the pin 13 into the protective cylinder 12 against the elastic force of the spring 23. By such adjustment, the elastic force of the spring can be set to a predetermined fixing force of the connecting pin.

Next, a determination method will be described. As shown in FIG. 6, a band 36 is placed on a worktable 35 having a concave portion 34 by a jig or the like, and the end of the connection pin 37 is brought into contact with the open end of the push pin 13 of the determination tool. Next, the judgment tool is pressed against the band until the push pin is immersed in the cap 11. As shown in the center of FIG. 6, if the connecting pin 37 does not come out of the connecting hole 38a of the band piece 38, the fixing force of the connecting pin to the piece satisfies a predetermined target value. As shown on the right side of the figure, if the connecting pin comes off from the band piece, the fixing force of the connecting pin 37 to the piece does not satisfy the predetermined target value. When the judgment tool is not used, the push pin 13 is hidden by protruding the cap 11 as shown in FIG. By doing so, it is possible to avoid the risk that the push pin touches the foreign matter and breaks or bends.

On the other hand, as shown in FIG.
Since it is immersed in the main body 10, it does not rotate due to external force. Therefore, the elastic force of the spring does not fluctuate carelessly. When the push pin 13 is broken or bent, the cap 11 is removed, the mounting member 27 is removed, and the push pin 13 is replaced with a new one. In this way, the replacement of the push pin is easily and inexpensively achieved. FIG.
If a large number of attachment members having large and small push pins having different diameters as shown in FIG. 0 are prepared, the push pins having an appropriate diameter can be exchanged according to the diameter of the connection pin.

In the above embodiment, the biasing means is a coil spring, but may be replaced by a leaf spring, rubber, or the like. The biasing means may be any means as long as the shaft 21 can be biased outward of the main body 10. Further, the material of the protection cylinder 12 is not limited to plastic.
Any material may be used as long as it is a soft material that does not damage the band. For example, rubber or cork may be used.

[0020]

According to the present invention, defective products can be easily determined without looking at the scale of the scale. Therefore, even an unskilled person can obtain an accurate determination result without making an error in the determination. Further, since the protective cylinder 12 comes into contact with the band, the band is not damaged.

[Brief description of the drawings]

FIG. 1 is a plan view of a judgment tool according to an embodiment of the present invention.

FIG. 2 is a sectional view.

FIG. 3 is a sectional view showing a state where a push pin is pushed in.

FIG. 4 is an exploded plan view.

FIG. 5 is a diagram showing a method of adjusting a spring.

FIG. 6 is a diagram illustrating a determination method.

FIG. 7 is an enlarged sectional view of a distal end portion of the determination tool.

FIG. 8 is an enlarged sectional view in which a push pin is immersed.

FIG. 9 is an enlarged sectional view of a rear portion.

FIG. 10 is a view as seen from the rear end.

FIG. 11 is a diagram showing various push pins.

FIG. 12 is a diagram showing a conventional determination method.

[Explanation of symbols]

 1 scale 2 tray 3 push pin 4 pedestal 5 band 6 connecting pin 7 band piece 10 cylindrical body 11 cap 12 protective cylinder 13 push pin 14 flat part 15 large diameter hole 16 small diameter hole 17, 18 thread 19, 20 Hole 21 Sliding shaft 22 Flange 23 Coil spring 24 Screw hole 25 Adjustment screw 26 Step 27 Pin mounting member 28 Threaded portion 30 Hole 31 Scale 32 Receiving tray 33 Hexagon hole 34 Recess 35 Work bench 36 Band 37 Connecting pin 38 Band Piece

Claims (10)

[Claims] 1. A cylindrical main body, a sliding shaft mounted inside the main body so as to be movable in the axial direction, a push pin mounted at one end of the shaft, and the other end of the shaft housed inside the main body in the axial direction. And a retaining means for preventing the shaft from being pulled out of the main body at a position where the push pin protrudes from one end of the main body by the urging means. A determination tool for determining a fixing force of a connection pin of a wristwatch band by pressing a push pin against a part. 2. The judgment tool according to claim 1, further comprising a cap attached to the main body so as to be movable in an axial direction, and a push pin can be inserted therein. 3. The judging device according to claim 2, further comprising a protective tube made of a soft material so that the push pin passes therethrough. 4. The judgment tool according to claim 3, wherein the protection cylinder is attached to a tip of the cap. 5. The judgment tool according to claim 2, wherein the push pin can be stored inside the cap by moving the cap. 6. The determining tool according to claim 2, wherein a flat portion for preventing rolling of the determining tool is formed on an outer periphery of the cap. 7. The judging tool according to claim 1, further comprising an adjusting screw which abuts on the spring opposite to the other end of the shaft and is attached movably along the axial direction. 8. The judgment tool according to claim 7, wherein the adjustment screw can be immersed inside the main body. 9. The judgment tool according to claim 1, wherein a push pin is provided upright on a pin mounting member screwed to the shaft. 10. A cylindrical main body, a sliding shaft mounted inside the main body so as to be movable in the axial direction, a push pin mounted at one end of the shaft, and the other end of the shaft housed inside the main body in the axial direction. Using a determination tool comprising: a biasing unit that biases the shaft, and a retaining unit that prevents the shaft from being pulled out of the main body at a position where the push pin projects from one end of the main body by the biasing unit,
A determination method for determining a fixing force of a connection pin of a watch band by pressing a push pin against an end of the connection pin of the watch band.