JP4987821B2 - Fixing the lead wire of the sheathed heater heating wire - Google Patents

Description

  The present invention relates to a method for fixing a lead wire of a sheathed heater (including a cartridge type), and more particularly to a technique for preventing a lead wire disconnection accident.

Conventionally, a sheathed heater has been used. The lead wire of the sheathed heater is formed by, for example, a lead pin (see, for example, Patent Document 1). Furthermore, a coated stranded wire may be connected to the tip of the lead pin.
7 to 9 show a first conventional example in this case, and show a fixing method of the lead wire 56 of the sheathed heater 50. The lead wire 56 has a lead pin 57 and a covered stranded wire 58.
First, as shown in FIG. 7, the lead pin 57 is connected to the heating wire 52 wound around the ceramic core 53. Next, as shown in FIG. 8, a covered stranded wire 58 is connected to the tip end portion of the lead pin 57 by welding, caulking, or the like to constitute a heating wire assembly 59. Next, as shown in FIG. 9, putting heating wire assembly 59 from the opening of the sheath pipe 51 into the sea scan pipe 51, powdery electric magnesia or the like between the sheath pipe 51 and the heating wire assembly 59 After filling the insulator 54 and reducing the diameter of the sheath pipe 51 by swaging or the like to increase the filling density of the electrical insulator 54 and polishing the outer surface of the sheath pipe 51 to adjust the dimensions of the sheath pipe 51, 55, the opening of the sheath pipe 51 is sealed. The coated stranded wire 58 is drawn out of the mouth insulator 55 through the through hole of the mouth insulator 55. FIG. 10 shows an enlarged view of the fixed portion of the lead wire 56 of FIG.

Further, FIG. 11 shows a second conventional example. In FIG. 11, in the sheathed heater 60, a heating wire assembly 69 is placed inside a sheath pipe 61, and a powdery electrical insulator 64 is filled between the sheath pipe 61 and the heating wire assembly 69. The heating wire assembly 69 is obtained by winding a heating wire 62 around a ceramic core 63 and connecting a lead wire 66 to the heating wire 62. The lead wire 66 has a lead pin 67 and a covered stranded wire 68. A lead pin 67 connected to the heating wire 62 is drawn out of the mouth insulator 65 through a through hole of the mouth insulator 65. Then, the coated stranded wire 68 is connected to the tip end portion of the lead pin 67, and the connection sleeve 70 covers this connection portion. Furthermore, an insulating tube 71 covers a portion of the lead pin 67 that is outside the mouthpiece 65, the vicinity of the connection portion of the connection sleeve 70 and the coated stranded wire 68.
JP-A-9-84461

However, in the first conventional example described above, the lead pins 57 and the long covered stranded wires 58 are included in the heating wire assembly 59 in all work steps, so that there is a problem that the work is difficult and dangerous. .
Further, in the second conventional example, since the hard lead pin 67 protrudes to the outside of the mouth insulator 65, when the sheathed heater 60 is attached to a workpiece that moves up and down and up and down, the lead pin 67 and the covered stranded wire are often used. There was a problem that an accident occurred in which 68 was disconnected near the connection sleeve 70.
Accordingly, the object of the present invention is to fix the heating wire lead of the sheathed heater that solves the above-mentioned problems, facilitates the assembly work of the sheathed heater, and reduces the occurrence of the lead pin of the lead wire and the coated strand wire. Is to provide a method.

According to one aspect of the present invention, a method of fixing the lead wire of the origination heat rays sheathed heater containing the heating wire in the interior of the sheath heater, the lead wire and a wire twisting coated with lead pins, said lead pin Is connected to the heating wire, the coated stranded wire is connected to the tip of the lead pin, and the portion where the coated stranded wire is connected to the tip of the lead pin is columnar and a through hole is formed in the axial direction of the column. was placed penetrations hole of the protection member, the axial end portion is abutted against an end portion of the sheathed heater, the protective member and base portion the ends of the metal sheath pipes of the sheathed heater of the protective member in the state in which the metal sleeve covering at the ends of the protective member and the metallic sheath pipe by reduced diameter the base portion of the metal sleeve is fixed at the base moiety, the reduced diameter of the base portion Said protection Compressing the through hole of the member is fixed to the lead wire into the through hole of the protection member, also other protective member is inserted into another tip portion and base portion of the metal sleeve, the other protective member columnar In addition, a through hole is formed in the axial direction of the column, and a covered stranded wire of the lead wire is inserted into the through hole of another protective member, and the covered stranded wire of the lead wire is inserted into the coil spring, and this coil spring is the other In the state where the through hole of the protective member is inserted, the diameter of the tip portion of the metal sleeve is reduced to fix the other protective member at the tip portion, and the through hole of the other protective member is reduced by reducing the diameter of the tip portion. A method for fixing a lead wire of a heating wire of a sheathed heater is characterized by compressing and fixing a coil spring in a through hole of another protective member, and fixing a coated stranded wire to the coil spring .

According to the first aspect of the present invention, the lead wire is composed of a lead pin and a covered stranded wire, and the portion where the tip of the lead pin connected to the heating wire and the covered stranded wire are connected is columnar and penetrates in the axial direction of the column. holes are disposed penetrations hole of the protection member formed, the axial ends of the protective member is brought into contact with an end portion of the sheathed heater, the protective member and the end of the metal sheath pipes of the sheathed heater part disposed metal sleeve covering a group moiety, with the ends of the protective member and the metallic sheath pipe by reduced diameter a base portion fixed at base portion, compressing the protective member by reduced diameter of the proximal portion By compressing the through hole of the protective member and fixing the lead wire to the through hole of the protective member, the connection point between the lead pin of the lead wire and the covered stranded wire is connected to the metal via the protective member and the metal sleeve. Shi It can be reliably fixed to Supaipu.
Further, by reducing the diameter of the tip portion of the metal sleeve, the other protection member is fixed at the tip portion, and the through hole of the other protection member is compressed, and the covered stranded wire is fixed via the coil spring. .

The invention according to claim 2, a method of fixing the lead wire of the heating wire of the sheath heater according to claim 1, characterized in Tei Rukoto formed bent broken distal end portion of the metal sleeve sheathed This is a method for fixing a lead wire of a heater heating wire.

  According to a second aspect of the present invention, another protective member is inserted into the bent tip portion of the metal sleeve, the other protective member is columnar and a through-hole is formed in the axial direction of the column. Inserting a covered stranded wire of the lead wire into the through hole of the member, reducing the diameter of the tip portion of the metal sleeve and fixing the other protective member at the tip portion of the metal sleeve, and the tip portion of the metal sleeve The through hole of the other protective member is compressed by reducing the diameter of the lead wire so that the covered stranded wire of the lead wire is fixed to the through hole of the protective member. The covered stranded wire of the lead wire is fixed by the through hole of the protective member.

According to a third aspect of the invention, a fixing method according to claim 1 or claim 2 heating wire leads of the sheathed heater according to, through other protective member comprises a co-yl spring flexible a method of fixing the lead wire of the heating wire of the sheath heater, characterized that you have been drawn out from the hole.

  According to a third aspect of the present invention, the coated stranded wire of the lead wire is inserted through the inside of the coil spring, the coil spring is inserted through the through hole of the other protective member, and the tip end portion of the metal sleeve is reduced The other protection member is fixed at the tip portion of the metal sleeve, and the through hole of the other protection member is compressed by reducing the diameter of the tip portion of the metal sleeve so that the coated stranded wire of the lead wire is used as the coil spring Since it fixes to the through-hole of the said protection member via, a covering strand wire is protected by a flexible coil spring.

The invention described in claim 4 is the method of fixing the lead wire of the origination hot wire of the sheath heater according to any one of claims 1 to 3, at one end of the sheathed heater formed leads two , Each coated stranded wire of each lead wire is inserted into a separate coil spring, and each coil spring is separately inserted into two through holes formed in the other protective member, and the metal of the other protective member in the inner side of one end of the sleeve, a method of fixing the heating wire of the lead wire of the sheath heater, characterized that you have been connected to each other.

According to the fourth aspect of the present invention, at one end of the other protective member disposed inside the metal sleeve, the coil springs that are separately inserted into the two through holes formed in the other protective member are connected to each other. The

According to the first aspect of the present invention, the assembly work is easy and the occurrence of disconnection accidents of the lead pins of the lead wires and the coated stranded wires is reduced. In addition, the tensile strength of the lead wire drawn out of the sheathed heater can be increased.
According to the invention described in claim 2, the effect with the invention described in claim 1, even when pulling out the lead wire of the sheath heater in a direction different from the axial direction of the sheath heater sheath pipes, bended broken metal sleeve Since it is possible to draw out the covered stranded wire of the lead wire in the direction in which the tip portion is bent, it is not necessary to bend the lead wire, so that the space required for the lead wire can be reduced.
According to the invention described in claim 3, the effect with the invention described in claim 1 or claim 2, leads are protected by a coil spring.
By the invention of claim 4, wherein the lever, the effect with the invention described in any one of claims 1 to 3, by connecting together the respective coil springs inside the metal sleeve, the respective coil springs are other It is possible to prevent the protective member from coming off and coming off from the through hole .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of a sheathed heater manufactured by the lead wire fixing method according to the first embodiment of the present invention, and FIG. 2 is used for the lead wire fixing method according to the first embodiment. A protection member is shown. 3 shows a side view of the sheathed heater manufactured by the lead wire fixing method according to the second embodiment, FIG. 4 shows a cross section taken along the line AA in FIG. 3, and FIG. B section is shown. Further, FIG. 6 shows a cross section of a sheathed heater manufactured by the lead wire fixing method according to the third embodiment of the present invention.

(First embodiment)
As shown in FIG. 1, the fixing method of the 1st lead wire 23 and the 2nd lead wire 26 of the heat generating wire 21 of the sheathed heater 10 which put the heat generating wire 21 inside the sheathed heater 10 is as follows.
The heating wire 21 is wound around the ceramic core 22 and the first lead wire 23 and the second lead wire 26 are connected to the heating wire 21 to form the heating wire assembly 20. An electrical insulator 12 such as magnesia is filled between the heating wire assembly 20 placed in the metal cylindrical sheath pipe 11 of the sheathed heater 10 and the sheath pipe 11.
The first lead wire 23 is connected to one end of the heating wire 21, the second lead wire 26 is connected to the other end of the heating wire 21, and a voltage is applied between the first lead wire 23 and the second lead wire 26. A current flows through the heating wire 21 and the heating wire 21 generates heat due to Joule heat.

  The first lead wire 23 has a first lead pin 24 and a first covered stranded wire 25, the base of the first lead pin 24 is connected to one end of the heating wire 21, and the first covered stranded wire 25 is connected to the first lead pin 24. It is connected to the tip part 24a. The second lead wire 26 has a second lead pin 27 and a second covered stranded wire 28, the base of the second lead pin 27 is connected to the other end of the heating wire 21, and the second covered stranded wire 28 The lead pin 27 is connected to the tip 27a. In addition, the 1st lead pin 24 and the 2nd lead pin 27 are single wires, for example, are a nickel wire and a 2 chrome wire. In addition, the first coated stranded wire 25 and the second coated stranded wire 28 use a stranded wire such as a nickel wire or a copper wire as a conductor, and an insulating coating (for example, a glass fiber coating) covering the stranded wire is formed. . When the first covered stranded wire 25 is connected to the distal end portion 24 a of the first lead pin 24, the stranded wire of the first covered stranded wire 25 is connected to the distal end portion 24 a of the first lead pin 24. Further, when the second covered stranded wire 28 is connected to the tip portion 27 a of the second lead pin 27, the stranded wire of the second covered stranded wire 28 is connected to the tip portion 27 a of the second lead pin 27.

As shown in FIG. 2, the protection member 30 has a columnar shape, and a first through hole 31 and a second through hole 32 are formed in the axial direction of the column. The surface of the one end 33 and the surface of the other end 34 in the axial direction are circular. D1 is the diameter of the protective member 30. The protective member 30 is made of a material that does not break even when compressed strongly against heat, such as Teflon (registered trademark).
As shown in FIG. 1, the location where the first covered stranded wire 25 is connected to the tip 24a of the first lead pin 24 is disposed in the first through hole 31 of the protective member 30, and the second covered stranded wire 28 is further connected. A portion connected to the distal end portion 27 a of the second lead pin 27 is disposed in the second through hole 32 of the protection member 30. Then, one end 33 in the axial direction of the protection member 30 is brought into contact with the end portion of the sheath pipe 11 of the sheathed heater 10, and a cylindrical metal sleeve 35 covering the end portion of the protection member 30 and the sheath pipe 11 is disposed, The diameter of the metal sleeve 35 is reduced and the ends of the protective member 30 and the sheath pipe 11 are fixed by the metal sleeve 35, and the protective member 30 is compressed by reducing the diameter of the metal sleeve 35, whereby the through-hole 31 of the protective member 30, The first lead wire 23 and the second lead wire 26 are fixed to the through holes 31 and 32 of the protection member 30 by compressing 32.

(Operational effects of the first embodiment)
The locations where the tip portions 24a and 27a of the lead pins 24 and 27 and the coated stranded wires 25 and 28 are connected are respectively disposed in the through holes 31 and 32 of the protection member 30, and one end 33 in the axial direction of the protection member 30 is provided. Is placed in contact with the end portion of the sheath pipe 11, the protective member 30 and the metal sleeve 35 covering the end portion of the sheath pipe 11 are arranged, the diameter of the metal sleeve 35 is reduced, and the end portions of the protective member 30 and the sheath pipe 11 are arranged. Are fixed by the metal sleeve 35, and the protective member 30 is compressed by reducing the diameter of the metal sleeve 35, thereby compressing the through holes 31, 32 and the leading end portions 24a, 27a of the lead pins 24, 27 and the coated stranded wires 25. , 28 are fixed to the through holes 31, 32 of the protection member 30, so that the connection portions of the lead pins 24, 27 and the coated stranded wires 25, 28 are connected to the protection member 3. And it can be reliably fixed to the sheath pipe 11 through the metal sleeve 35. Each of the coated stranded wires 25 and 28 is drawn out from the protective member 30 to the outside.

(Second Embodiment)
The second embodiment is a modification of the first embodiment. As shown in FIG. 4, the lead wires 23a and 26a of the heating wire 21 of the sheathed heater 10 (corresponding to the lead wires 23 and 26 in FIG. 1). This is the fixing method.
As shown in FIG. 3, the tip portion 35y of the metal sleeve 35a is bent at a right angle with respect to the base portion 35x of the metal sleeve 35a, and another protective member 36 is inserted into the tip portion 35y. As shown in FIG. 4, the other protective member 36 has a columnar shape, and a first through hole 37a and a second through hole 37b are formed in the axial direction of the column. The other protective member 36 is made of a material that does not crack even when it is strongly compressed by heat, such as polypenco, but may be Teflon (registered trademark), silicone, myorex, or the like.
Further, as shown in FIG. 4, the first covered stranded wire 25a of the first lead wire 23a passes through the first coil spring 39a, and the first coil spring 39a passes through the first through hole 37a of the other protective member 36. The second covered stranded wire 28a of the second lead wire 26a is inserted through the second coil spring 39b, and the second coil spring 39b is inserted through the second through hole 37b of the other protective member 36.
As shown in FIG. 5, the distal end portion 35y is reduced in diameter to fix the other protective member 36 at the distal end portion 35y, and the through holes 37a and 37b of the other protective member 36 are compressed by reducing the diameter of the distal end portion 35y. Then, the coil springs 39a and 39b and the covered stranded wires 25a and 28a are fixed to the through holes 37a and 37b of the other protective member 36 via the coil springs 39a and 39b.

As shown in FIG. 5, one end 38a of the other protection member 36 is disposed inside the metal sleeve 35a, and the other end 38b of the other protection member 36 is located at the tip of the tip portion 35y. The first coil spring 39a and the second coil spring 39b are connected to each other at one end 38a of the other protective member 36 by a connecting portion 39x. For this reason, the first coil spring 39a and the second coil spring 39b are prevented from coming off and coming off from the through holes 37a, 37b of the other protective member 36.
Further, a protective member 30a (corresponding to the protective member 30 in FIG. 1) is disposed on the base portion 35x (see FIG. 4) of the metal sleeve 35a. Further, the diameter D2 of the other protective member 36 may be the same as the diameter of the protective member 30a.

As shown in FIG. 4, the protection member 30 a has a columnar shape, and a first through hole 31 a and a second through hole 32 a are formed in the axial direction of the column. The surface of the one end 33a and the surface of the other end 34a in the axial direction are circular. The diameter of the protective member 30a is the same as the diameter D1 (see FIG. 2) of the protective member 30.
A location where the first covered stranded wire 25a is connected to the tip 24y of the first lead pin 24x is disposed in the first through hole 31a of the protective member 30a, and the second covered stranded wire 28a is further connected to the tip of the second lead pin 27x. The part connected to 27y is arrange | positioned in the 2nd through-hole 32a of the protection member 30a. Then, one end 33a of the protective member 30a in the axial direction is brought into contact with the end of the sheath pipe 11 of the sheathed heater 10, and the base portion 35x of the metal sleeve 35a is attached so as to cover the end of the protective member 30a and the sheath pipe 11. The base member 35x is reduced in diameter, the protective member 30a and the end of the sheath pipe 11 are fixed by the base portion 35x, and the protective member 30a is compressed by reducing the diameter of the base portion 35x, thereby penetrating the protective member 30a. The holes 31a and 32a are compressed to fix the first lead wire 23a and the second lead wire 26a to the through holes 31a and 32a of the protection member 30a. As shown in FIG. 5, the first coated strand 25a has a double coating of an outer coating 25x and an inner coating 25y, and the second coated strand 28a has two outer coatings 28x and 28y. Has a heavy coating.

(Operational effects of the second embodiment)
The covered stranded wires 25a and 28a of the lead wires 23a and 26a are inserted through the coil springs 39a and 39b, respectively. The coil springs 39a and 39b are inserted through the through holes 37a and 37b of the other protective member 36, and the tip of the metal sleeve 35a. The diameter of the portion 35y is reduced to fix the other protective member 36 at the tip portion 35y, and the through-holes 37a and 37b of the other protective member 36 are compressed by reducing the diameter of the tip portion 35y, and the coil springs 39a and 39b and leads Since the covered stranded wires 25a and 28a of the wires 23a and 26a are fixed to the through holes 37a and 37b of the other protective member 36 via the coil springs 39a and 39b, the covered stranded wires 25a and 28a are flexible coil springs 39a. , 39b.
As in the first embodiment, the connection location of each lead pin 24x, 27x and each coated stranded wire 25a, 28a can be securely fixed to the sheath pipe 11 via the protective member 30a and the metal sleeve 35a. . Further, as the distance from the one end 33a to the other end 34a of the protective member 30a is longer, the stability of the caulking due to the diameter reduction of the base portion 35x of the metal sleeve 35a is improved.

(Third embodiment)
As shown in FIG. 6, the lead wires 23 b and 26 b of the heating wire 21 of the sheathed heater 10 are fixed. One end of a metal pipe 46 is welded to the end of a metal sheath pipe 11 of the sheathed heater 10, and a first through hole 41 and a second through hole 42 are formed in the metal pipe 46 in a cylindrical shape and in the axial direction of the cylinder. The protective member 40 is inserted, and one end 43 of the protective member 40 is brought into contact with the end of the electrical insulator 12 such as magnesia filled in the sheath pipe 11. The diameter D3 of the protection member 40 is equal to the inner diameter of the sheath pipe 11, and the material of the protection member 40 is the same as the material of the protection member 30. At that time, locations where the coated stranded wires 25 and 28 are connected to the tip portions 24a and 27a of the lead pins 24 and 27 are disposed in the through holes 41 and 42, respectively. In addition, the coated stranded wires 25 and 28 are drawn out from the other end 44 of the protective member 40.
Then, the diameter of the metal pipe 46 is reduced and the protection member 40 is fixed by the metal pipe 46, and the through holes 41 and 42 of the protection member 40 are compressed by reducing the diameter of the metal pipe 46 so that the lead wires 23 b and 26 b are protected. It fixes to 40 through-holes 41 and 42.

(Operational effect of the third embodiment)
A protective member 40, which is cylindrical and has through holes 41, 42 formed in the axial direction of the cylinder, is inserted into a metal pipe 46 whose end is welded to the end of the sheath pipe 11 of the sheathed heater 10. The locations where the wires 25 and 28 are connected to the tip portions 24 a and 27 a of the lead pins 24 and 27 are arranged in the through holes 41 and 42 of the protection member 40. Then, the diameter of the metal pipe 46 is reduced and the protective member 40 is fixed by the metal pipe 46, and the protective member 40 is compressed by reducing the diameter of the metal pipe 46 to compress the through holes 41 and 42 of the protective member 40. Since the connection portions of the lead pins 24 and 26 of the lead wires 23b and 26b and the covered stranded wires 25 and 28 are fixed to the through holes 41 and 42 of the protective member 40, the lead pins 24 and 26 of the lead wires 23b and 26b are fixed. And the connection location of each coating strand 25,28 can be reliably fixed to the sheath pipe 11 via the protection member 40 and the metal pipe 46. FIG. Further, the respective coated stranded wires 25 and 28 are drawn out from the other end 44 of the protective member 40 to the outside.

  In the second embodiment, the coil springs 39a and 39b may not be provided. In this way, another protective member 36 is inserted into the bent tip portion 35y of the metal sleeve 35a, and the other protective member 36 is columnar and has through holes 37a and 37b formed in the axial direction of the column. The covered strands 25a and 28a of the lead wires 23a and 26a are inserted into the through holes 37a and 37b of the protection member 36, the diameter of the tip portion 35y is reduced, and the other protection member 36 is fixed by the tip portion 35y. By reducing the diameter of 35y, the through holes 37a and 37b of the other protective member 36 are compressed and the covered stranded wires 25a and 28a are fixed to the through holes 37a and 37b. Therefore, the other protective member 36 fixed in the tip portion 35y is used. The covered stranded wires 25a and 28a are fixed by the through holes 37a and 37b.

In each of the above embodiments, two lead wires (23, 26, etc.) are formed at one end of the sheathed heater 10. However, the present invention is not limited to this, and one lead wire is formed at one end of the sheathed heater. The other lead wire may be formed at the other end of the sheathed heater.
In the second embodiment, the distal end portion 35y of the metal sleeve 35a is bent at a right angle with respect to the base portion 35x. However, the present invention is not limited to this, depending on the direction in which the lead wire of the sheathed heater 10 is pulled out. The angle at which the distal end portion 35y of the metal sleeve 35a is bent with respect to the base portion 35x can be selected as an arbitrary angle such as 45 ° or 30 °.

It is sectional drawing of the sheathed heater manufactured by the fixing method of the lead wire which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the protection member used for the fixing method of the lead wire which concerns on the 1st Embodiment of this invention. It is a side view of the sheathed heater manufactured by the fixing method of the lead wire concerning a 2nd embodiment of the present invention. It is AA sectional drawing of the sheathed heater of FIG. It is BB sectional drawing of the sheathed heater of FIG. It is sectional drawing of the sheathed heater manufactured by the fixing method of the lead wire which concerns on the 3rd Embodiment of this invention. It is a 1st prior art example, and is a fragmentary figure which shows the state in which the lead pin was connected to the heating wire wound around the ceramic core. FIG. 8 is a partial view showing a state in which a covered stranded wire is connected to the tip of the lead pin of FIG. 7. It is sectional drawing of the sheathed heater of a 1st prior art example. FIG. 10 is an enlarged cross-sectional view illustrating a lead wire fixing portion of FIG. 9. It is sectional drawing of the 2nd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sheath heater 11 Sheath pipe 21 Heating wire 23 1st lead wire 24 1st lead pin 24a Tip part 25 1st covered strand 26 Second lead wire 27 2nd lead pin 27a Tip 28 28 2nd covered strand 30 Protection member 31 1st 1 through hole 32 second through hole 33 one end 35 metal sleeve 40 protective member 41 first through hole 42 second through hole 43 one end 46 metal pipe

Claims (4)

A method of fixing the lead wire of the origination heat rays sheathed heater containing the heating wire in the interior of the sheath heater,
The lead wire and a wire twisting coated with lead pins, before Symbol lead pin is connected to the heating wire, said coating strand is connected to the distal end of the lead pin, the distal end portion of the front Symbol coated twisted the lead pin the portions connected disposed columnar and and penetrations within the pores of the protective member axially through holes are formed in the pillar, abutting the end portion in the axial direction of the front Symbol protective member at an end portion of the sheathed heater is allowed, the ends of the metal sheath pipe before Symbol protective member and the sheathed heater in the state in which the metal sleeve covering a group moiety,
The base portion of the metal sleeve is reduced in diameter to fix the end portions of the protection member and the metal sheath pipe at the base portion , and the through hole of the protection member is compressed by reducing the diameter of the base portion to Fix the lead wire to the through hole of the protective member ,
Further, another protective member is inserted into a tip portion different from the base portion of the metal sleeve, the other protective member is columnar and a through hole is formed in the axial direction of the column, In the state where the covered stranded wire of the lead wire is inserted into a through hole, the covered stranded wire of the lead wire is inserted through a coil spring, and the coil spring is inserted through the through hole of the other protective member,
The front end portion of the metal sleeve is reduced in diameter to fix the other protection member at the front end portion, and the through hole of the other protection member is compressed by reducing the diameter of the front end portion, thereby the other protection member. A method for fixing a lead wire of a heating wire of a sheathed heater , wherein the coil spring is fixed to a through hole of the sheathed heater, and the covered stranded wire is fixed to the coil spring . A method for fixing a lead wire of a heating wire of the sheathed heater according to claim 1,
It said tip portion folded bent formed fixing method leads of the heating wire of the sheath heater characterized by Tei Rukoto of the metal sleeve. A method for fixing a lead wire of a heating wire of the sheathed heater according to claim 1 or 2,
Before SL Koirusu flop ring fixing method of the heating wire of the lead wire of the sheath heater, it characterized that you have been drawn out from the through hole of the other of the protection member includes a flexible. A method of fixing the lead wire of the origination hot wire of the sheath heater according to any one of claims 1 to claim 3,
Two lead wires are formed at one end of the sheathed heater, and each covered stranded wire of each lead wire is inserted into a separate coil spring, and each coil spring is connected to the other protective member 2 one the formed through-holes are inserted separately, at one end of the other protective member positioned inside of the metal sleeve, the heating wire of the lead wire of the sheath heater, characterized that you have been connected to each other Fixing method.

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