JPS6319059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves forming a loose insertion gap by loosely inserting a metal support shaft into the hollow part of a metal cylinder that constitutes a moving contact by winding a conductor, and soldering this loose insertion gap. The present invention relates to a method of manufacturing a heat coil used in a communication protector.

Currently, as shown in FIG. 1, the heating coil 1 has a metal support shaft 4 loosely inserted into the hollow part 3 of the metal cylinder 2 constituting the moving contact to form a ring-shaped loose insertion gap 5 in the axial direction. The inside of the loose insertion gap 5 is soldered 6, and the cylindrical body 2 has a flange 7 extending from one end thereof to serve as a moving contact, and a conductive wire 8 constituting a current-carrying line is wound around the outer periphery of the flange 7. Then, one end of the lead wire 9 of the conducting wire 8 is connected to the collar portion 7. 10 is the above-mentioned support shaft 4
It is a cylindrical insulating case that is fixed at one end and stored in a hollow space, and a fixed contact 1 is mounted on the upper part of the insulating case
1 is provided, and the other end lead wire 12 of the conductive wire 8 is connected to the fixed contact 11. This heat coil 1
The conductor 8 generates heat due to cross-wires such as overcurrent, melts the solder 6, and moves the cylinder 2 in the axial direction of the support shaft 4 according to the cylinder's own weight or the terminal spring force of the communication protector (not shown). It was moved to 2000 and used to block the railroad tracks. Therefore, the heating coil 1 requires high precision in soldering into the loose insertion gap 5 in order to always set the operating current value constant.

Conventionally, the heating coil 1 was soldered into the loose insertion gap 5 by hand using a soldering iron. With this method, various conditions such as soldering iron temperature, surrounding outside air temperature, and amount of solder affect the melting of the solder, and variations occur depending on the skill level of the operator, making it difficult to obtain stable operating performance of the heating coil. .

In particular, since the loose insertion gap 5 of the heating coil 1 is narrow and formed in a ring shape around the support shaft 4,
Not only is it not easy to pour solder into the loose insertion gap 5 using a soldering iron, but it also requires a high degree of skill to pour solder evenly along the ring.
In addition, since the spindle 4 is loosely inserted into the cylinder 2 in a free state, the gap into which solder is first poured is widened by the poured solder, preventing the spindle 4 from shifting or tilting. As a result, a heating coil with accurate operating performance could not be manufactured.

In addition, since the loose insertion gap 5 extends in the axial direction, the phenomenon of immersion and wetting is likely to occur, and the inside of the gap cannot be soldered sufficiently.

Furthermore, depending on the timing of heating with a soldering iron and the amount of solder, solder may flow out from below the loose insertion gap 5 and adhere to the axis of the support shaft 4 outside the loose insertion gap, which may cause failure of the heating coil 1. It was also the cause.

The present invention was developed in view of the above-mentioned points, and aims to standardize the soldering technology for the loose insertion gap of the heating coil and mass-produce the heating coil with stable operating performance. is its purpose. Hereinafter, the present invention will be explained based on an embodiment shown in FIG. 2 and subsequent figures.

Reference numeral 12 denotes a ring-shaped solder, which is press-molded to a certain amount to fill the loose insertion gap 5. 13,14
are a pair of electrodes facing each other so that they can move forward and backward, and are made of a metal material with high specific resistance that generates heat. 15
is a horizontally long jig that holds the heating coil, and jig 1
5 moves in a direction substantially perpendicular to the direction in which the electrodes 13 and 14 move forward and backward. 16 is the upper plate of the jig 15, 17 is a holding hole drilled at predetermined intervals in the upper plate 16 for inserting the spindle 4, 18 is the bottom plate of the jig 15, and 19 is the upper plate 16.
and a positioning spacer interposed between the bottom plate 18 and the bottom plate 18;
Reference numeral 20 denotes a pair of clamping pieces having spring properties provided below each of the holding holes 17, 17, . . . on the upper plate 16.

During manufacturing, the flange 7 of the cylinder 2 into which the support shaft 4 is loosely inserted is placed upward, and the ring-shaped solder 12 is inserted from the upper end of the support shaft 4 and placed on the upper surface of the flange 7 to form the loose insertion gap 5.
It will be installed in one opening of the. Next, the lower end of the support shaft 4 is inserted into the holding hole 17 of the jig 15 and held tightly, and then further inserted and pressed between the clamping pieces 20 to abut against the upper surface of the bottom plate 18. In this case, the movement stroke of the cylinder 2 is set by being regulated by the upper surface of the upper plate 16, and the cylinder 2 is set in a free state laterally relative to the fixation of the support shaft 4. A large number of support shafts 4 are set on the jig 15 in the manner described above.

In this set state, the electrode 14 is moved forward and the center of the outer periphery of the cylindrical body 2 is sandwiched between the electrodes 13 and 14.
When electricity is applied between the electrodes 13 and 14, the entire cylinder 2 is heated by heat generated mainly by the resistance, and the ring-shaped solder 12 placed on the flange 7 melts and flows into the loose insertion gap 5. To be more specific, the ring-shaped solder 12 that has received heat transfer from the flange 7 of the cylindrical body 2 first uniformly flows along the periphery of the flange of the loose insertion gap 5 . By uniformly flowing into the periphery of the flange, the position of the cylinder 2 with respect to the support shaft 4 is corrected. Next, in addition to the capillary phenomenon in the loose insertion gap 5, the loose insertion gap 5 becomes a vacuum state due to the overall heating, and a suction force to the solder is generated, so that the molten solder is loosely inserted without adhering to the flange surface. It flows into the gap 5, completely flows to the regulation position on the upper surface of the upper plate 16, and is soldered. Electric heating is performed in sequence as described above.

Also, instead of the cylindrical body 2, the upper end of the support shaft 4 is connected to both electrodes 1.
3 and 14 and heat with electricity. As the support shaft 4 is heated, the ring-shaped solder 12 first melts uniformly along the circumference of the support shaft 4, thereby correcting the position of the cylinder 2 with respect to the support shaft 4. Then, according to the vacuum state within the loose insertion gap 5, the entire loose insertion gap is soldered. When the free insertion gap 5 is wide, the cylinder body 2 and the support shaft 4
At the same time, both are energized and heated to achieve good soldering.

FIG. 4 and FIG. 5 show another embodiment, and FIG.
The figure shows a case where lifting of the cylindrical body 2 is prevented. That is, since the cylindrical body 2 is soldered in a free state with respect to the fixation of the spindle 4 to the jig 15, a lifting force of the cylindrical body 2 acts in the opposite direction to the pouring force of the ring-shaped solder 12, and heat is generated. An error will occur in the movement stroke of the coil 1. In this case, the electrodes 14 and 15 are advanced from diagonally above the cylinder 2 to apply a downward force to the cylinder 2. Similarly, a groove 21 into which the end of the cylindrical body 2 is fitted may be provided adjacent to the holding hole 17 of the upper plate 16. The groove 21 allows accurate positioning of the loose insertion gap 5. Although not shown, it is also possible to provide a contact piece for the flange 7 upright on the upper surface of the jig 15 and press the flange 7 with this contact piece to prevent it from lifting up.

As mentioned above, the explanation has been made based on the embodiment in which the flange 7 is placed upward, but when the flange 7 is placed downward, the fifth
As shown in the figure, a ring-shaped disc 22 on which a ring-shaped solder 12 is placed is fitted to the end of the cylinder 2. The ring-shaped disk 22 has an inner circumference 2 having approximately the same diameter as the inner circumference of the cylinder 2.
3, and a means 24 for fitting with the outer periphery of the cylindrical body 2 on the lower surface.
Equipped with.

The effects of the present invention are as follows.

The loose insertion gap of a heat coil used in a communication protector can be soldered by an electrical heating method, the technique for soldering to the loose insertion gap can be standardized, and a heat coil with stable quality can be manufactured.

The ring-shaped solder can be set simply by positioning at least the spindle with the ring-shaped solder facing the loose insertion gap, and soldering can be quickly performed by simply pinching the ring with the electrodes.The work speed is fast and it can be implemented in the mass production process.

The ring-shaped solder can be simultaneously poured along the ring-shaped part of the loose insertion gap without spotting, and the position of the cylinder and the support shaft can be corrected by pouring the solder along the circumference of the cylinder or support shaft, where the entire body is heated. This makes it possible to prevent the support shaft from shifting or tilting within the loose insertion gap.

Since the inside of the loose insertion gap is brought into a vacuum state as the entire cylinder or support shaft generates heat, a suction force can be exerted on the molten solder, and it is possible to prevent immersion and wetting in the loose insertion gap in the axial direction. At the same time, the solder is molded to a certain amount to prevent the solder from flowing too much, eliminating the cause of heat coil failures.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a heat coil used in a communication protector, and FIG. 2 and subsequent figures show a method for manufacturing a heat coil used in a communication protector according to the present invention, and FIG. The slope view and Figure 3 show the manufacturing process, Figure A is a sectional view showing the set state, Figure B is a partially enlarged sectional view showing the initially melted state, and Figure C is a sectional view showing the finished state. , FIG. 4, and FIG. 5 are sectional views showing other examples. DESCRIPTION OF SYMBOLS 1... Heat coil, 2... Metal cylindrical body, 4... Metal support shaft, 5... Free insertion gap, 7... Flange part, 12... Ring-shaped solder, 13, 14... Electrode, 15... Jig, 17... Holding hole, 20...Pinch piece.

Claims (1)

[Claims] 1 Manufacture of a heat coil used in a communication protector, which is formed by loosely inserting a metal support shaft into the hollow part of a metal cylinder constituting a moving contact to form a loose insertion gap in the axial direction, and soldering the loose insertion gap. After placing a ring-shaped solder molded to a certain amount in the opening of the loose insertion gap and positioning at least the support shaft,
A communication protector characterized in that a cylindrical body or a support shaft is sandwiched between a pair of opposing electrodes, the cylinder or the support shaft is heated as electricity is passed between the electrodes, and solder is poured into the loose insertion gap and soldered. A method of manufacturing a heat coil used for.