JPH0955255A - Plug for kotatsu - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sheathing member from being loosened, and let tensile force prevention for a covered knitted cord by surely carried out. SOLUTION: An insertion hole 4 for inserting a cord 3 where an electrical wire 2 is covered with a sheathing member 1 formed by knitting so as to be formed, is formed in a plug main body 5. Paired guide pieces 6 are provided for the insertion hole 4, and concurrently, a space between the paired guide pieces 6 is formed into a passage part 7 through which the cord 3 is inserted. Pressure contacting pieces 8 which are pressed in contact with the outer surface of the cord 3 to be inserted through the passage part 7, are projected to the passage part 7 so as to be provided for the respective guide pieces 6. The sheathing member 1 can be prevented form being loosened by pressing the pressure contacting pieces 8 onto the covered knitted cord 3, and the covered knitted cord 3 can thereby be firmly held by the pressure contacting pieces 8 by preventing the sheathing member 1 from being loosened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kotatsu plug attached to a cord for electrically connecting a power source and a kotatsu heater.

[0002]

2. Description of the Related Art Conventionally, to connect a cord connected to a power source to a kotatsu heater, a kotatsu plug is provided at an end of the cord and the kotatsu plug is inserted into a plug receiver provided in the kotatsu. The kotatsu plug is generally composed of a body and a cover. The body is formed with a groove for an insertion port on its front surface and a groove for an insertion port on its back surface, and a blade receiving spring is provided inside the body. Similar to the above-mentioned body, the cover is formed by forming a groove for an insertion port on its front surface and a groove for an insertion port on its back surface. The cord used for the kotatsu is made by braiding (sacking) so that a braiding cord or the like is hollow to form a jacket material, and a conductor such as a copper wire is formed inside the jacket material by an insulator such as a synthetic resin. It is formed by accommodating an electric wire coated with (referred to as a bagging cord).

When the cord is attached to the kotatsu plug, the jacket material at the end of the cord is removed to expose the electric wire, and the insulator at the end of the electric wire is removed to expose the conductor to insert the body. Insert the vicinity of the end of the outer covering material of the cord into the groove for the mouth and connect the conductor to the blade receiving spring,
The cover is attached to the body with screws or the like, and the cord is sandwiched between the insertion slot of the body and the insertion slot of the cover. Further, the kotatsu plug has an insertion opening formed by aligning the insertion opening groove of the body with the insertion opening groove of the cover.

Then, the cord and the heater are connected by inserting the kotatsu plug into the plug receiver and inserting a pin provided in the plug receiver and connected to the heater into the kotatsu plug from the insertion opening to connect with the blade receiving spring.
The power supply and the heater can be connected.

[0005]

However, in the kotatsu plug of the above-mentioned conventional example, the cord is attached so that the cord is sandwiched between the insertion opening groove of the body and the insertion opening groove of the cover. It is not possible to firmly fix the end of the material with the insertion opening groove of the body and the cover, and it becomes easy for the jacket material to fray from the edge. There was a problem that it could not be stopped.

Further, the kotatsu plug of the above-mentioned conventional example has a problem that the end portion of the outer covering material cannot be firmly fixed by the insertion slot of the body and the cover, and the pushing of the cord cannot be prevented. there were. Further, the kotatsu plug of the above-mentioned conventional example is formed to have substantially the same height (thickness) as that of other types of plugs such as ironing plugs, and there is a possibility that other types of plugs may be accidentally inserted into the plug receiver. It was

The present invention has been made in view of the above-mentioned points, and it is possible to prevent the cord from being frayed, reliably stop the tension of the cord, and prevent the cord from being pushed in. It is an object of the present invention to provide a kotatsu plug capable of preventing the insertion of other types of plugs into the plug receiver.

[0008]

The invention according to claim 1 of the present invention is to insert a cord 3 formed by covering an electric wire 2 with an outer jacket material 1 made by braiding. The insertion port 4 is formed in the plug main body 5, a pair of guide pieces 6 is provided in the insertion port 4, and a passage portion 7 for inserting the cord 3 is formed between the guide pieces 6, and the cord 3 inserted in the passage portion 7 is formed. It is characterized in that a press-contact piece 8 for press-contacting the outer surface of the guide piece 6 is provided on each guide piece 6 so as to project into the passage portion 7.

In addition to the structure of claim 1, the invention according to claim 2 of the present invention further comprises a braid stop 9 for preventing the fray of the jacket material 1 on the outer periphery of the end of the cord 3. Provided,
It is characterized in that projections 10 which are locked to both sides of the cord 3 of the braid stop 9 in the longitudinal direction are formed in the plug body 5 so as to project into the passage portion 7. Further, in the invention described in claim 3 of the present invention, in addition to the configuration of claim 1 or 2, an erroneous insertion prevention piece 12 protruding from the inner surface of the plug receiver 11 into which the plug body 5 is inserted is inserted. It is characterized in that the groove portion 13 is formed in the plug body 5.

[0010]

Embodiments of the present invention will be described below. The plug body 5 is configured by combining a body 14 and a cover 15 which are made of a synthetic resin such as melamine phenol resin. As shown in FIG. 2, the body 14 is formed in a box shape having an opening on the inner surface side, and a plurality of insertion groove portions 16 having a substantially arcuate cross-section opening on the inner and outer sides of the body 14 and on the inner surface side are provided on the front surface thereof. . Also body 14
A blade receiving spring accommodating portion 18 corresponding to each of the insertion groove portions 16 is formed inside. Also body 14
A thermistor mounting portion 41 is provided inside, and at the thermistor mounting portion 41, the body 14 is provided with a plurality of intake ports 42 for taking in outside air in a long hole.
Further, inside the body 14, a terminal housing portion 45 is formed in which a terminal 44 connected to the thermistor 43 is housed.

On the rear side of the inside of the body 14, a spring accommodating recess 20 surrounded by the rear surface of the body 14 and the partition 19 is formed, and the spring accommodating recess 20 and the inner surface of the body 14 are formed on the rear surface of the body 14. A spring lead-out groove portion 21 opening to the side is provided. In addition, partition 1
A pair of guide pieces 6 are provided so as to project inside 9 and a space between the guide pieces 6 is formed as a passage portion 7. FIG. 3 (a)
As shown in FIG. 3, one end of the passage portion 7 is opened as the insertion port 4 in the spring accommodating recess 20, and the other end of the passage portion 7 is opened as the introduction port 22 inside the body 14. The depth dimension of the passage portion 7 is formed to be slightly smaller than the diameter of the cord 3 which will be described later, and most of the radial portion of the cord 3 is accommodated in the passage portion 7. Further, as shown in FIG. 3B, pressure contact pieces 8 projecting into the passage portion 7 are provided on both side edges of the insertion port 4 and the introduction port 22, and the bottom side edges of the insertion port 4 and the introduction port 22 are provided. The portion is provided with a plurality of substantially quadrangular pyramid-shaped protrusions 10 protruding into the passage portion 7.

On the rear side of the outer surface of the body 14, a handle portion 23 that inclines downward to the front side is provided in a protruding manner, and the handle portion 23 is formed with a non-slip portion 24 formed by a plurality of protrusions. I am doing it. Further, on the front surface side of the outer surface of the body 14, a pair of groove portions 13 opening to the front surface of the body 14 are formed in parallel. In addition, the handle recesses 2 are provided on both sides of the body 14.
5 is provided. Further, a screw insertion hole 26 is formed in the body 14, and an outer surface of the body 14 on the front side and one groove portion 13 are formed.
On the bottom surface and on both sides of the non-slip portion 24 of the handle portion 23.

As shown in FIG. 4, the cover 15 is formed in a box shape whose inner surface is open, and the cover 15 is provided on the front surface thereof.
A plurality of insertion groove portions 27 having a substantially arcuate cross-section that are open to the inside and outside and the inner surface side are provided so as to correspond to the insertion groove portions 16 of the body 14. Further, inside the cover 15, a blade receiving spring storage portion 28 corresponding to each of the insertion groove portions 27 is formed so as to correspond to each blade receiving spring storage portion 18 of the body 14.

Further, on the rear side of the inside of the cover 15, a spring accommodating recess 30 surrounded by the rear surface of the cover 15 and the partition 29 is formed corresponding to the spring accommodating recess 20 of the body 14 and the cover 15 is formed. On the back surface, a spring accommodating concave portion 30 and a spring lead-out groove portion 31 opening to the inner surface side of the cover 15 are provided so as to correspond to the spring lead-out groove portion 21 of the body 14. A pair of separating pieces 32 are provided on the inner side of the partition portion 19, and a space between the separating pieces 32 is formed as a communicating portion 33 corresponding to the passage portion 7 of the body 14. This communication part 33
One end of the through hole 33 is opened in the spring accommodating recess 30 so as to correspond to the insertion port 4 of the body 14, and the other end of the penetrating portion 33 is used as an introducing recess 35 and the introducing port 22 of the body 14. Correspondingly, it is opened inside the cover 15. In addition, the insertion recess 34 and the introduction recess 35
A plurality of protrusions 10 similar to the protrusions 10 of the body 14 are provided on the bottom side edge of the.

On the back side of the outer surface of the cover 15, a handle portion 23 that inclines downward to the front side is projected, and the handle portion 23 is formed with a non-slip portion 24 formed by a number of projections. I am doing it. Further, on the front side of the outer surface of the cover 15, a pair of groove portions 13 opening to the front surface of the cover 15 are formed in parallel. Further, the handle recesses 2 are provided on both sides of the cover 15.
5 is provided. Further, a screw insertion hole 26 is formed in the cover 15, and an outer surface on the front side of the cover 15 and one groove portion 13 are formed.
On the bottom surface and on both sides of the non-slip portion 24 of the handle portion 23.

As shown in FIG. 8B, the blade receiving spring 50 is formed by bending a metal plate such as a copper plate.
It is composed of a pair of opposing sandwiching pieces 51 having elasticity and a base portion 52. Each sandwiching piece 51 is formed in a substantially arcuate cross-section that is convexly curved outward, and the opposing sandwiching pieces 51 are formed as insertion gaps 56. Further, an auxiliary spring 53 is attached to the blade receiving spring 50 so as to sandwich both the sandwiching pieces 51, and the auxiliary spring 53 assists so that the space between the sandwiching pieces 51 is not too wide. Further, the spring 60 is formed in a substantially columnar shape whose diameter increases toward the tip end side, and a locking portion 61 having a large diameter is formed on the base portion thereof.
Is formed.

The cord 3 is formed by braiding a braiding cord so as to form a hollow, and an outer cover material 1 is formed. A conductor 54 such as a copper wire is provided inside the outer cover material 1 and a synthetic resin such as chlorosulfonated polyethylene rubber. Formed by accommodating a plurality of electric wires 2 coated with an insulator 55 formed by (referred to as a bagging cord)
It is. At one end of the cord 3, a plug for inserting into a power outlet is provided and the cord 3
The other end of is processed in the following manner to connect to the blade receiving spring 50. First, as shown in FIG. 5A, the outer jacket material 1 at the end of the cord 3 is cut off to expose the electric wire 2.
Next, as shown in FIG.
It is folded back between the wire and the electric wire 2 (inside the jacket material 1), and is wound around the outer periphery of this end with a thread such as cotton thread 3 to 5 times, and this thread is sewn to the jacket material 1 to Firmly sew the ends. In this way, it is possible to form the braid stop portion 9 protruding from the outer periphery of the cord 3 so that the jacket material 1 is not frayed from the end portion. Finally, the insulator 55 at the tip of the electric wire 2 is removed to expose the tip of the conductor 54 and
As shown in (c), the crimp terminal 90 is caulked to the tip of the conductor 54.

Next, the assembly of the kotatsu plug will be described. First, the blade receiving springs 50 are housed in the blade receiving spring housings 18 of the body 14, respectively, and a mounting screw 70 penetrating the base 52 of the blade receiving spring 50 is inserted into the body 14 as shown in FIG. 8B. The blade receiving spring 50 is fixed to the body 14 by screwing on the provided screw receiving 71. Further, the thermistor 43 is attached to the thermistor attaching portion 41, and the terminal 44 is attached to the terminal accommodating portion 45 with the attaching screw 70. Further, the connecting portion 44a of the terminal 44 and the thermistor 43 are connected by the electric wire 75, and the thermistor 43 and the terminal portion 50a connected to one blade receiving spring 50 are connected by the electric wire 76.

Next, approximately half of the engaging portion 61 of the spring 60 in the radial direction is fitted into the spring accommodating portion 20 of the body 14 to attach the spring 60 to the body 14. Next, the cover 15 is arranged on the inner surface side of the body 14, and substantially half of the locking portion 61 of the spring 60 in the radial direction is fitted into the spring accommodating portion 30 of the cover 15. Next, each of the assembly screws 72 is inserted into each of the screw insertion holes 26 of the cover 15, and the tip of the assembly screw 72 is inserted into the screw insertion hole 26 of the body 14 so as to project to the outer surface of the body 14, and a nut is attached to the tip of the assembly screw 72. By screwing on, a 4-pole 5-core kotatsu plug as shown in FIGS. 1 (a) and 7 (a) (b) (c) is formed. On the front surface of this kotatsu plug, an insertion opening 77 is formed by the insertion insertion groove 16 of the body 14 and the insertion insertion groove 27 of the cover 15 facing each other. It is designed to communicate with 56.

Next, the attachment of the in-bag cord 3 to the kotatsu plug will be described. First, the radial lower side of the end portion of the cord 3 is inserted into the passage portion 7 of the body 14 from the inner surface side of the body 14, and the tip of the outer covering material 1 is inserted from the introduction port 22 to the body 1.
4, and the cord 3 is led out of the body 14 through the insertion port 4. At this time, as shown in FIG. 1C, the pressure contact piece 8 on the insertion port 4 side and the pressure contact piece 8 on the introduction port 22 side are bited into the cord 3 for pressure contact. In addition, the cord 3 has an insertion port 4
Side protrusion 10 and the inlet 22 side protrusion 10 are pressed into contact with each other, and the braid stop 9 provided at the end of the cord 3 is attached to the insertion port 4 side protrusion 10 and the inlet port 22 side protrusion 10.
Be placed between the two. Next, the mounting screws 70 are respectively passed through the crimping terminals 90 provided on the electric wires 2 and the blade receiving springs 50 are operated by the mounting screws 70 as described above.
Is fixed to the body 14 and the electric wire 2 and the blade receiving spring 50 are connected. Next, the spring 60 inserted into the cord 3 is attached to the body 14 as described above, and the cover 15 is attached to the body 14 as described above. At this time, the radial upper side of the cord 3 located in the passage portion 7 is housed in the penetrating portion 33 of the cover 15. Further, the tip of the outer jacket material 1 is projected into the body 14 from the introduction recess 35, and the cord 3 is led out of the body 14 from the insertion recess 34.
In addition, the protrusion 10 on the side of the insertion recess 34 and the protrusion 10 on the side of the introduction recess 35 provided in the cover 15 on the cord 3 are bited into pressure contact with each other, and the braid stop 9 provided at the end of the cord 3
Is positioned between the protrusion 10 on the insertion port 4 side and the protrusion 10 on the introduction port 22 side. In this way, the cord 3 can be attached to the kotatsu plug.

In the above kotatsu plug, since the pressure contact piece 8 for pressure contacting the outer surface of the cord 3 is provided in the passage portion 7 through which the cord 3 is passed, the outer cover material 1 is sandwiched by the pressure contact piece 8 and does not fray (do not loosen). ) You can Further, in the above kotatsu plug, the pressure contact piece 8 is provided on the insertion port 4 side of the passage portion 7 and the introduction port 22.
Since it is provided on the side, the press-contact piece 8 can be press-contacted at two positions in the longitudinal direction of the cord 3, and the prevention of the fraying of the jacket material 1 is higher than the case where one press-contact piece 8 is press-contacted to the cord 3. be able to. The above kotatsu plug is a pressure contact piece 8
Since the cord 3 is pressed against the cord 3, it also has a function of stopping tension so that the tension applied to the cord 3 is not transmitted to the blade receiving spring 50. Further, since the above-mentioned kotatsu plug can accommodate most of the cord 3 in the radial direction in the passage portion 7 of the body 14, the jacket material 1 is prevented from fraying even before the cover 15 is attached to the body 14. Can be

Further, in the above kotatsu plug, since the projection 10 for press-contacting the outer surface of the cord 3 is provided in the passage portion 7 through which the cord 3 is passed, the outer cover material 1 is sandwiched by the projection 10 and does not fray (do not loosen). You can Further, since the above-mentioned kotatsu plug is provided with the projections 10 on the insertion port 4 side and the introduction port 22 side of the body 14 and on the insertion recessed portion 34 side and the introduction recessed portion 35 side of the cover 15, two pieces in the longitudinal direction of the cord 3 are provided. The protrusion 10 can be pressed into contact with one place, and one protrusion 10
It is possible to prevent the outer cover material 1 from being frayed more effectively than pressing the cord 3 against the cord 3. Further, in the above kotatsu plug, even if a force (tension) is applied to the cord 3 to pull it out from the kotatsu plug, the braid stop portion 9 provided on the cord 3 is provided with the protrusion 10 on the insertion port 4 side of the body 14 and the insertion recess 34 of the cover 15. The protrusion 10 on the side can be engaged, and the tension can be prevented from being transmitted to the blade receiving spring 50. Further, in the above kotatsu plug, even if a force for pushing the cord 3 into the kotatsu plug is applied, the braid stop portion 9 provided on the cord 3 is provided with the protrusion 10 on the introduction port 22 side of the body 14 and the protrusion 10 on the introduction recess 35 side of the cover 15. Can be locked to the code 3
You can prevent it from being pushed into the kotatsu plug.

9 (a) and 9 (b) are sectional views of the plug receiver 11 into which the kotatsu plug is inserted. The plug receiver 11 is formed by providing an opening 11a on the front surface and providing an erroneous insertion preventing piece 12 at a position corresponding to the groove 13 provided in the kotatsu plug therein. The erroneous insertion preventing pieces 12 are formed in parallel with each other inside the plug receiver 11 so as to be inserted into the groove 13 of the cover 15, and are inserted into the groove 13 of the body 14 below the inside of the plug receiver 11. A pair is formed in parallel so as to be free. A pin 80 is provided on the bottom surface of the plug receiver 11 at a position corresponding to the insertion port 77 of the kotatsu plug. This pin 80 is connected to a kotatsu heater, and by inserting a kotatsu plug into the plug receiver 11, the pin 80 is inserted into the insertion port 77 and is inserted into the insertion gap 56 of the blade receiving spring 50. It is sandwiched by 51, and the electric wire 2 of the cord 3 and the heater can be connected in this manner.

The kotatsu plug can be attached to the plug receiver 11 by inserting the groove portion 13 into the erroneous insertion preventing piece 12. Since the plug receiver 11 is provided with an erroneous insertion prevention piece 12, other types of plugs 85a, 85b such as an iron plug having no groove 13 as shown in FIG. 9B are erroneously inserted. It is possible to prevent the prevention piece 12 from being caught and not inserted into the plug receiver 11.

[0025]

As described above, the invention according to claim 1 of the present invention has an insertion opening for inserting a cord formed by covering an electric wire with an outer covering material made by braiding. Formed on the plug body, provided with a pair of guide pieces at the insertion port, formed between the guide pieces as a passage part for inserting the cord, and projecting the pressure contact piece for making pressure contact with the outer surface of the cord inserted in the passage part into the passage part. Since the guide piece is provided on each guide piece, it is possible to prevent the outer covering material from being frayed by pressing the pressure contacting piece to the cord, and thus preventing the fraying of the outer covering material in this manner. The cord can be firmly clamped by and the tension of the cord can be reliably stopped.

According to a second aspect of the present invention, a braid stop is provided on the outer periphery of the end of the cord to prevent fraying of the jacket material, and the braid stop has a longitudinal direction of the cord. Since the protrusions that are locked on both sides of the cord are formed on the plug body by protruding into the passage, the protrusion on the insertion port side can be locked to the braid stop even if tension is applied to the cord. Can be surely performed. Also, even if force is applied to the cord, the protrusion on the side opposite to the insertion port side can be locked to the braid stop part,
It is possible to prevent the cord from being pushed in.

Further, according to the third aspect of the present invention, since the groove portion into which the erroneous insertion preventing piece protruding from the inner surface of the plug receiver into which the plug body is inserted is inserted is formed in the plug body, Even if you try to insert another type of plug that does not exist in the plug receiver, the misinsertion prevention piece can hit the plug, and you can prevent other types of plug from being inserted in the plug receiver. .

[Brief description of drawings]

1A is a perspective view showing an embodiment of the present invention, FIG. 1B is a partial sectional view, and FIG. 1C is a partial sectional view showing a state in which a cord is attached.

FIG. 2 is a plan view showing a body of the above.

FIG. 3A is a plan view showing a part of the same body as above.
(B) is an EE sectional view of (a).

FIG. 4 is a plan view showing the same cover.

5 (a) to 5 (c) are schematic views showing the steps of processing the above cord.

FIG. 6 is a plan view showing a state in which a cord is attached to the same body.

7A is a plan view of the same as above, FIG. 7B is a side view, FIG.
(C) is a front view.

FIG. 8A is a schematic plan view of the same as above, and FIG. 8B is a schematic side view.

9A is a sectional view showing a plug receiver, and FIG. 9B is a sectional view showing a state in which another type of plug is not inserted into the plug receiver.

[Explanation of symbols]

 1 Outer Cover Material 2 Wire 3 Cord 4 Insertion Port 5 Plug Main Body 6 Guide Piece 7 Passage 8 Pressure Contact Piece 9 Braid Stop 10 Protrusion 11 Plug Receiving 12 Wrong Insert Prevention Piece 13 Groove

Claims (3)

[Claims] 1. A plug body is formed with an insertion opening for inserting a cord formed by covering an electric wire with an outer covering material made of a braid, and a pair of guide pieces is provided at the insertion opening. At the same time, the kotatsu plug is characterized in that the guide pieces are formed as passage portions through which the cords are inserted, and pressure contact pieces that are brought into pressure contact with the outer surface of the cords inserted through the passage portions are provided on the respective guide pieces so as to project into the passage portions. 2. A cord stopper is provided on the outer periphery of the end portion of the cord to prevent fraying of the jacket material, and projections that are locked to both sides of the cord stopper in the longitudinal direction of the cord are provided in the passage portion. The kotatsu plug according to claim 1, wherein the kotatsu plug is formed so as to protrude into the main body of the plug. 3. The plug main body is formed with a groove portion into which an erroneous insertion preventing piece protruding from an inner surface of a plug receiver into which the plug main body is inserted is inserted.
Kotatsu plug described in.