JP2611998B2 - Connection method between base pin and lead wire - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of electrically and mechanically connecting a base pin such as a fluorescent lamp and a lead wire inserted through the base pin, and more particularly, to a lead pin connected to the base pin. To a connection method for connecting by a caulking method.

2. Description of the Related Art In a ring-shaped or straight tube-type fluorescent lamp, a base pin attached to an end of a glass tube has a cylindrical shape, and a lead wire extending from the end of the glass tube is inserted into the base pin. Electro-mechanical connection at the tip. The method of connecting the base pin and the lead wire is generally a soldering method, a welding method, or a caulking method.

The soldering method is a method in which a lead wire inserted into a base pin is cut near the end of the base pin, and the end of the lead wire is soldered to the end of the base pin. In addition, the welding method is a method in which a lead wire inserted into a base pin and a tip end of the base pin are welded and connected by arc welding.
However, this soldering method or welding method has a problem in that the shape of the pin tip is uneven due to the molten and solidified metal mass formed at the tip of the die pin, resulting in poor appearance. The heat of the time may have an adverse effect on the base pin and the like.

Therefore, recently, there has been a tendency that a lead wire is inserted through a base pin and a connection method based on a caulking method of connecting to a lead wire by caulking a tip end of the base pin is often used. Next, a description will be given with reference to FIGS.
In the drawing, 1 is a base of a fluorescent lamp, 2 is a cylindrical base pin having a base end fixed to the base 1, 3 is a lead wire,
4 and 5 are a jig and a punch for swaging.

First, as shown in FIG. 7, the lead wire 3 is inserted into the base pin 2 from inside the base 1. Next, as shown in FIG. 8, the lead wire 3 protruding from the tip of the cap pin 2 is cut near the tip of the cap pin 2. Next, as shown in FIG. 9, the jig 4 is inserted onto the base 1. The jig 4 has a pin hole 6 through which the base pin 2 is inserted, and a guide hole 7 that extends in a direction orthogonal to a part of the pin hole 6 and into which the punch 5 is inserted. The jig 4 is placed on the base 1 by inserting the base pin 2 into the pin hole 6 in the retracted position indicated by the chain line in FIG. 9. After the jig 4 is inserted, the punch 5 moves forward, and as shown by the solid line in FIG. 9, the tip of the punch presses a part of the outer periphery of the tip of the die pin 2 to immerse and deform. The deformed portion 8 cuts into a part of the tip of the lead wire 3 and the base pin 2 and the lead wire 3 are connected by caulking. Thereafter, the punch 5 is retracted, and the jig 4 is removed from the base pin 2. Although the connection between the base pin 2 and the lead wire 3 is completed in the above steps, since the front end of the lead wire 3 protrudes from the front end of the base pin 2 and the appearance of the pin tip is poor,
The tip surface of the last cap pin 2 is polished in the direction of the arrow in FIG. 10 to remove the tip of the lead wire 3 protruding from the pin tip, and the tip of the cap pin 2 is finished flush.

The method of connecting the base pin and the lead wire by the above-mentioned caulking method has the advantage that there is no adverse effect due to heat and the tip shape of the base pin is easy to be uniform, but many steps are required for the finishing process of the tip of the base pin performed after caulking. And the workability is poor.

Also, the finish of the tip of the base pin is performed by grinding the tip of the base pin with a grinder. At this time, metal burrs are generated at the tip of the base pin in the polished direction, and the tip shape of the base pin is improper. There is also the problem of being uniform and unsightly.

Problems to be Solved by the Invention Therefore, in order to solve such a problem, for example, Japanese Unexamined Patent Publication No. 61-147438 discloses a process of inserting a lead wire into a base pin and a lead wire protruding from the base pin. Cutting the lead wire so that it slightly protrudes from the base pin,
A method of connecting a base pin and a lead wire including a step of pushing a tip of a lead wire slightly protruding from the base pin into a tip portion of the base pin and a step of electrically and mechanically connecting the base pin and the lead wire is disclosed. I have.

According to this proposal, as described above, since the finishing process by polishing after the caulking connection is not required, the shape of the pin tip can be made uniform and the appearance can be improved. However, in this connection method, after cutting the lead wire protruding from the base pin near the tip of the pin, the lead wire protruding from the base pin is pushed into the base pin.
A slack corresponding to the amount of the push-back is generated in the lead wire in the base, and the direction of the slack is not constant due to the stress acting on the lead wire or the lead-out form from the stem to the base pin. Therefore, in particular, in the case where four lead wires are wired in one base, such as a ring-shaped fluorescent lamp, the lead wires are undesirably contacted due to the loosening of the lead wires pushed back into the base pins. May be done. When the lead wires come into contact in this way, a new problem arises in that the fluorescent lamp does not turn on, or even if the fluorescent lamp does turn on, the discharge in the cold cathode state causes the electrode material to scatter greatly and shorten the life. .

In addition, when cutting the lead wire protruding from the base pin near the tip of the pin, the sharpness of the cutter may be reduced, or the blade may be partially chipped.
The lead wire may be caught and caught in the cutter. In such a state, the lead wire is strongly pulled out of the base pin by the cutter,
In some cases, the lead wire breaks in the base or at a portion derived from the stem. If the lead breaks,
Since the electrodes cannot be energized, there is also a problem that the lighting operation of the fluorescent lamp cannot be performed.

Therefore, an object of the present invention is to provide a comparatively simple structure that can completely prevent the lead wires from coming into contact with each other even when the lead wire protruding from the base pin is pushed into the tip portion of the base pin, and that when the lead wire is cut, It is an object of the present invention to provide a method for connecting a base pin and a lead wire, which can prevent undesired disconnection of a lead wire in a base or the like.

Means for Solving the Problems Accordingly, the present invention is configured as the following steps a to e in order to achieve the above object.

(a) A step of inserting a lead wire through a base pin provided on the base so as to protrude from the base pin.

b) A caulking jig having a pin hole for receiving the base pin in a state where the lead wire protrudes from the base pin, and having a guide hole extending outward in a direction orthogonal to a part of the pin hole,
A step of mounting so that the base pin is inserted into the pin hole.

c. A step of electrically and mechanically caulking the base pin and the lead wire by inserting the punch into the guide hole to locally press and deform the base pin.

d. A step of cutting the lead wire projecting from the base pin near the tip of the base pin after removing the caulking jig from the base pin.

(e) After the step of cutting the lead wire, a step of pressing the lead wire slightly protruding from the base pin in the axial direction with a rod to push the lead wire tip into the tip of the base pin.

In the method of the present invention, the lead wire portion slightly protruding from the base pin is pushed into the tip of the base pin after the base pin and the lead wire are connected by caulking, so that the lead wire inward (base side) from the caulked connection portion. Does not move at all and can prevent contact between the lead wires in the base. Therefore, the teaching characteristics of the fluorescent lamp are not adversely affected, and the finish is not applied to the base pin, so that a good appearance can be maintained.

Moreover, since the cutting of the lead wire protruding from the base pin is performed after the base pin and the lead wire are caulked and connected, even if the lead wire is caught by the cutter and caught by the cutter due to some cause in the cutter, it is broken. Since it is a lead wire located outside the base pin from the swaged connection portion, there is no problem that the fluorescent lamp does not turn on.

Furthermore, the caulking connection between the base pin and the lead wire is performed by inserting a punch into the guide hole with the jig for caulking mounted so that the base pin is inserted into the pin hole, thereby locally connecting the base pin. The connection is performed by pressing and deforming, so that the base pin is not damaged by deformation or the like at the time of caulking connection.

EXAMPLES Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, but it goes without saying that various modifications can be made without departing from the spirit of the present invention.

1 and 2 show a state where lead wires 11, 11,... Are connected to four base pins 10, 10,. The four base pins 10, 10,... Are cylindrical pins of the same shape having inverted conical recesses m, m.
A method of connecting one base pin 10 and a lead wire 11 according to the present invention will be described below.

First, as shown in FIG. 3, a lead wire 11 is inserted into the base pin 10 from inside the base 9 and protrudes from the tip of the base pin 10. Next, as shown in FIG. 4, the caulking jig 12 is inserted onto the base 9. The jig 12 has a pin hole 13 penetrating vertically and a guide hole extending in a direction orthogonal to a part of the pin hole 13.
The base pin 10 is inserted into a lower portion of the pin hole 13, and a punch 15 for swaging the base pin is inserted into the guide hole 14 so as to be movable left and right. When the jig 12 is fixedly arranged on the base 9 by inserting the base pin 10 into the pin hole 13, the punch 15 is the base pin.
It faces a part of the outer periphery of the front end of the ten.

The jig 12 has four base pins 10, 10,.
Each having the above structure, and four base pins 1
0, 10... Are simultaneously inserted, and the next connection operation is performed simultaneously.

When the jig 12 is inserted into the base 9, the punch 15 moves forward, and the tip of the punch 15 immerses and deforms a part of the outer periphery of the tip of the base pin 10. And a connection is made by swaging the base pin 10 and the lead wire 11. After that, the punch 15 retreats and the jig
12 is removed from the base 9.

Next, as shown in FIG. 5, the tip of the eave wire 11 protruding from the tip of the base pin 10 is cut from a fixed location near the tip of the base pin 10. By this cutting, the protruding length of the lead wire 11 from the tip of the base pin 10 is made uniform, so that the subsequent pushing of the lead wire can be performed easily, reliably, and in a uniform shape.

Next, as shown in FIG. 6, the distal end of the lead wire 11 is axially pressed and pushed into the distal end of the base pin 10. For example, a rod for pushing a lead wire above the tip of the base pin 10
17 is arranged to be vertically movable. At the center of the lower end of the rod 17 is formed a projection n shaped to fit into the recess m at the tip of the base pin 10. The rod 17 is lowered when facing above the base pin 10, and first the projection n is moved to the tip of the lead wire 11. Lead wire 11
Press down. Then, the tip of the lead wire 11 is a base pin
The upper portion from the portion caulked and fixed to 10 is compressed and deformed in the axial direction, and is accommodated in the distal end portion of the base pin 10 including the recess m.
When this lead wire is pushed until the tip of the lead wire 11 reaches near the bottom of the concave portion m, the tip shape of the base pin 10 after the rod 17 is raised does not protrude from the lead wire 11. The original shape is maintained, and a finishing process for shaping the tip of the base pin is unnecessary. Also, cap pins
By providing a concave portion m at the tip of 10 and pushing the lead wire 11 into it, the pushing work of the lead wire 11 becomes easy.

The present invention is not limited to the above-described embodiment, and can be applied to a method of connecting a base pin and a lead wire, for example, in a straight tube fluorescent lamp or a bulb-type fluorescent lamp device.

Advantageous Effects of the Invention As described above, according to the present invention, the lead wire protruding from the base pin is pushed into the tip of the base pin after the base pin and the lead wire are electrically and mechanically caulked and connected. No bending force acts on the inner lead wires. For this reason, the lead wires located in the base do not come into contact with each other, and no defective point of the fluorescent lamp occurs.

Also, since the lead wire protruding from the base pin is cut near the tip of the base pin after caulking the lead wire and the base pin, the lead wire can be reliably cut from the portion to be cut. Even if hooked, the lead wire inside the caulked portion will not be broken, and thus no defect will occur.

Further, the lead wire protruding from the base pin is merely pushed into the base end of the base pin by the rod after caulking and connecting the base pin and the lead wire, and no processing is performed on the front end portion of the base pin. Therefore, since the tip shape of the base pin can maintain the original uniform shape before the lead wire is connected, the appearance of the base pin is not impaired.

Moreover, after the lead wire protruding from the base pin is pushed into the front end of the base pin, the finishing process for the front end of the base pin can be omitted, so that workability can be improved.

Furthermore, the caulking connection between the base pin and the lead wire is performed by inserting the punch into the guide hole while the jig for caulking is mounted so that the base pin is inserted into the pin hole, so that the base pin is locally connected. The base pin is not damaged by deformation or the like at the time of caulking connection.

[Brief description of the drawings]

1 to 6 are views for explaining the method of the present invention. FIG. 1 is a partial front view including a partial cross section of a base having a base pin and a lead wire connected in the present invention, and FIG. First
FIGS. 3 to 6 are partial cross-sectional views taken along the line AA of the figure, and FIGS. 3 to 6 are partial cross-sectional views showing the steps of connecting the base pin and the lead wire in FIG. 7 to 10 are partial cross-sectional views of a base pin for each process for explaining a conventional method of connecting a base pin and a lead wire. 9 ... Base, 10 ... Base pin, 11 ... Lead wire, 12 ...
Jig for caulking, 13 ... Pin hole, 14 ... Guide hole, 15 ...
Punch, 17 ... rod.

Claims (1)

(57) [Claims] A step of inserting a lead wire through a base pin provided on the base so as to protrude from the base pin, and a pin hole for receiving the base pin when the lead wire protrudes from the base pin. Then, by attaching a jig for caulking having a guide hole extending outward in the orthogonal direction from a part of the pin hole so that the base pin is inserted into the pin hole, and by inserting a punch into the guide hole A step of electrically and mechanically connecting the base pin and the lead wire by locally pressing and deforming the base pin, and a lead wire protruding from the base pin after removing the caulking jig from the base pin. After the step of cutting near the tip of the base pin and after the cutting step of the lead wire, the lead wire slightly protruding from the base pin is pressed in the axial direction by the rod, and the lead wire tip is inserted into the tip of the base pin. Base pins and connection leads, characterized in that it comprises a Komu to process.