JP3034114U - Terminal cap - Google Patents

Abstract

(57) [Problem] To provide a terminal cap that can reliably insulate a terminal of a spare electric wiring and can be easily attached and detached with respect to a terminal cap. SOLUTION: One end of a tubular main body 1 made of an insulating synthetic resin into which a terminal of a wiring 3 is inserted is closed by welding. In the vicinity of the welded end of body 1, body 1
Is gradually flattened, and an elliptical portion having a shorter diameter than the terminal of the wiring 1 to be inserted is formed, and the vicinity of the end where the terminal of the wiring 3 is welded from the open end of the main body 1 is formed. When it is inserted, the end of the wiring 3 bites into the body 1
Since 1 is locked to the end of the wiring 3, it can be easily mounted and the terminal of the wiring 3 can be reliably insulated from the surroundings. or,
If you pull out the main unit 1, you can easily remove it from the terminal of wiring 3.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a terminal cap used, for example, to insulate a terminal of a spare electric wire of a railway vehicle, and particularly to a terminal cap which can surely insulate the terminal of the spare electric wire and can be easily attached and detached. Is.

[0002]

[Prior art]

 Conventionally, in the electrical work of railway vehicles and the like, a large number of spare wires are wired in response to disconnection of wiring and addition of equipment in the future. The ends of these spare wires or the ends at one end are simply cut to prevent the conductors from contacting the vehicle body, etc. due to the insulation coating, and further wrapped with insulating tape to reliably prevent the conductors from contacting the vehicle body. I am trying to do it.

[0003]

[Problems to be solved by the device]

 However, simply cutting the end of the spare wiring may cause dust to adhere, and the moisture contained in the dust may mediate the insulation from the vehicle body, which is not preferable.

Further, the work of winding the insulating tape is not always possible to secure a space suitable for the work, and is very troublesome, and the insulating tape is peeled off in order to use the spare wiring. The work is quite troublesome.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a terminal cap that can reliably insulate the terminal of the spare electrical wiring from the surroundings and can be easily attached and detached. To do.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a terminal cap which is made of an insulating synthetic resin and has one end of a tubular main body 1 into which the end of the wiring 3 is inserted, which is closed by welding.

According to the present invention, when one end of the main body 1 is closed by welding, the main body 1 is gradually flattened in the vicinity of the welded portion, and the auxiliary electric wiring is connected from the end opposite to the closed end. When the terminal is inserted and the tip is pushed into the flat portion of the body 1, the body 1 is locked to the tip of the wiring 3 by its elasticity. That is, the present invention can be attached to the terminal of the wiring 3 by a simple operation of inserting the present invention into the terminal of the wiring 3, whereby the terminal of the wiring 3 can be reliably insulated from the surroundings.

The present invention attached to the end of the wiring 3 can be easily removed from the end of the wiring 3 by pulling out the present invention by hand. By the way, for example, it is said that the finished outer diameter tolerance of electric wires used for electrical equipment of railway vehicles should be within the JIS standard, and there are considerable variations depending on the electric wire manufacturer and the same electric wire manufacturer depending on the production lot. .

On the other hand, since the main body 1 of the present invention is formed by, for example, extrusion molding according to the nominal size of the wire, the error with respect to the nominal size is small, and when the wire of the corresponding nominal size is thick, the terminal It was discovered during the development of the present invention that the cap becomes difficult to insert, and when it is thin, a gap opens between the wire and the terminal cap, making it difficult to fix the terminal cap to the wire.

This problem can be solved by preparing a plurality of types of terminal caps having different inner diameter tolerances with respect to the nominal size, but this solution requires a large number of molds, and the manufacturing cost is extremely high. become.

In particular, for example, in the case of Shinkansen vehicles, there are a large number of spare wires with different nominal sizes, and the large number of end caps used at both ends have different inner diameter tolerances for different nominal sizes. It is even impossible to prepare different types of dies.

Therefore, in order to solve such a problem, the present invention further comprises a thin rib 2 projecting from the inner peripheral surface of the main body 1 toward the center, and the rib 2 is deformed by the deformation. Absorb the error in the outer diameter size of the electric wire, or together with this, or instead of this, form the main body 1 into an elliptic tube shape, and by deforming the main body 1, absorb the error in the outer diameter size of the electric wire. The permissible range of variation is increased.

[0013]

[Embodiment of the invention]

 A terminal cap according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in the perspective view of FIG. 1, the terminal cap includes a main body 1 made of an insulating synthetic resin tube, and one end of the main body 1 is welded, for example, by high frequency welding. It is a blockage.

In the vicinity of the welded end of the main body 1, the main body 1 is gradually flattened, and an elliptical portion having a shorter minor diameter than the diameter of the end of the spare wiring 3 inserted therein is formed. Therefore, when the end of the spare wire 3 is inserted from the open end to the vicinity of the welded end, the tip of the spare wire 3 bites into the main body 1, and the main body 1 elastically moves the main body 1 to the end of the spare wire 3. Will be locked in.

That is, the main body 1 is attached to the terminal of the auxiliary wiring 3 and the terminal of the auxiliary wiring 3 is reliably insulated from the surroundings by a simple operation of inserting the terminal cap into the tip of the auxiliary wiring 3. Become.

Further, the terminal cap inserted into the auxiliary wiring 3 can be removed from the terminal of the auxiliary wiring 3 by a simple operation of pulling out the terminal cap. By the way, the main body 1 is formed into an elliptic tube shape having an outer circumference major axis of 7.5 mm, an outer circumference minor axis of 5.6 mm and a wall thickness of 0.5 mm, for example, by extrusion molding, and then, for example, a length of about 10 to 30 mm. It is made by a procedure in which one end is closed by, for example, high-frequency welding, after that, or simultaneously with this cutting.

After that, if necessary, a line number, a symbol, a mark or the like for identifying the spare wiring 3 can be printed on the surface and can also be used as a ring mark. For extrusion molding of the main body 1, for example, as shown in the cross-sectional view of FIG. 2, an outer mold 3 having an elliptical extrusion opening 5 having a long diameter of 7.5 mm and a short diameter of 5.6 mm, and the outer mold 3 A metal mold is used in combination with an inner metal mold 4 having an elliptical protrusion 6 having an outer peripheral major axis of 6.6 mm and an outer minor diameter of 4.6 mm arranged concentrically in the extrusion 5.

Now, when the terminal cap is inserted into the spare wire 3 of a corresponding nominal size, if the outer diameter of the spare wire 3 is larger than the inner circumference minor diameter of the main body 1, a virtual view is shown in the front view of FIG. As shown by the line, the main body 1 expands in the minor axis direction and shrinks in the major axis direction, and deforms so as to approach a cylindrical shape. Therefore, even with a thick spare wire 3, the inner circumference of the main body 1 If the length is smaller than the diameter of the circle, which is the circumference length, the terminal cap can be easily inserted without feeling the hardness and workability is improved.

Further, variations in the outer diameter tolerance of the spare wiring 3 are absorbed by the deformation of the main body 1, and it is not necessary to prepare a large number of molds for one nominal size, so that the manufacturing cost is not increased. In addition, the spare wirings 3 having different nominal sizes can be shared within a certain range.

Further, if the outer diameter size of the spare wire 3 is larger than the inner circumference minor diameter of the main body 1, in addition to the tip of the spare wire 3 biting into the main body 1, the main wire 1 is removed from the spare wire 3. Since friction is generated between the main body 1 and the peripheral surface of the spare wire 3 against the pulling force, the terminal cap can be more reliably locked to the end portion of the spare wire 3.

In the terminal cap according to another embodiment of the present invention shown in the perspective view of FIG. 4, in addition to the structure of the previous example, a thin rib protruding toward the center on the inner peripheral surface of the main body 1 at every 60 °, for example. Two are provided.

As shown in FIG. 5, the elliptical extrusion port 5 of the outer mold 3 used for extrusion molding of this terminal cap is formed in the same manner as in the previous example, and the outer periphery of the protrusion 6 is the same as in the previous example of the inner mold 4. A trapezoidal groove 7 having a width of about 0.5 mm at the peripheral surface, a width of about 0.2 mm at the groove bottom, and a depth of about 0.5 mm is formed on the surface every 60 °.

As shown in FIG. 6, when the terminal cap is inserted into the spare wire 3 having the corresponding nominal size, the outer diameter of the spare wire 3 is within the minor axis of the main body 1 and is indicated by a broken line in the figure. If it is larger than the minor axis of the inscribed ellipse of the rib 2, the rib 2 is thin, as shown by the chain line in the figure, so it can easily be deformed and the preliminary wiring can be performed easily without feeling the hardness. 3 and the workability is improved, and the tip of each rib 2 abuts against the spare wire 3, so that there is no play between the spare wire 3 and the terminal cap, and the terminal cap can be securely attached. It can be locked to the terminal portion of the spare wire 3.

Further, when the outer diameter of the spare wiring 3 is slightly smaller than the circular shape in which the inner circumference length of the main body 1 is the circumference length and is larger than the inner circumference short diameter of the main body 1, two points are shown in FIG. As shown by the chain line, the main body 1 expands in the minor axis direction and shrinks in the major axis direction, and is deformed so as to approach a cylindrical shape, and the inner circumference of the main body is slightly longer than the circular shape. A spare wire 3 which is thinner than the thin spare wire 3 but is thicker than the inner circumference short diameter of the main body 1 can be easily inserted into the spare wire 3 without feeling hardness, and workability is enhanced. Of course, in this case, since each rib 2 is in contact with the spare wire 3, there is no play between the spare wire 3 and the terminal cap, and the terminal cap is securely locked to the terminal portion of the spare wire 3. be able to.

That is, variations in the outer diameter tolerance of the spare wiring 3 are absorbed by the deformation of the rib 2 and the main body 1, and it is not necessary to prepare a large number of molds for one nominal size, which increases the manufacturing cost. In addition, it is possible to share the spare wirings 3 having different nominal sizes within a certain range wider than the previous example.

The shape and dimensions of the rib 2 are not particularly limited as long as they are thin enough to be easily deformed when the spare wiring 3 is inserted, and the height is 0.4 to 0.4 corresponding to the nominal size. The thickness may be about 2 mm and the thickness at the base may be about 0.4 to 1 mm.

Although the six ribs 2 are formed in the above embodiment, the number of the ribs 2 is not particularly limited as long as one or more ribs 2 are provided, and the spare wiring 3 is provided at the center. It is preferable to provide three or more ribs 2 so as to be positioned.

The terminal cap according to another embodiment of the present invention shown in FIG. 7 is the same as the previous example except that the main body 1 is formed in a cylindrical shape. Although not shown, the extrusion port of the outer die for extruding the main body 1 has, for example, a diameter of 7. It is formed in a cylindrical shape of about 5 mm, and the projection of the inner mold is formed in a cylindrical shape with an outer diameter of about 6.1 mm, for example. A trapezoidal groove 7 having a width of about 0.5 mm on the peripheral surface, a width of about 0.2 mm at the groove bottom, and a depth of about 0.5 mm is formed on the outer peripheral surface of the protrusion at 60 ° intervals. There is.

According to this embodiment, it is possible to obtain the same operation or effect as each of the above-described embodiments except that the tolerance absorbing function due to the deformation of the main body 1 cannot be obtained. An end cap according to yet another embodiment of the present invention shown in FIG. 8 is constructed in the same manner as the embodiment shown in FIG. 7 except that the ribs 2 on the inner peripheral surface are omitted. Except that the tolerance absorbing function by the shape and the rib 2 cannot be obtained, the same operation or effect as in each of the above-described embodiments can be obtained.

[0031]

[Effect of the invention]

 As described above, the terminal cap of the present invention is made of insulating synthetic resin, and is formed by welding one end of a tubular body that is fitted onto the end of the wiring in a non-slip manner. With the simple work of inserting the end of the spare wiring into the open end, the main body is fitted onto the end of the spare wiring in a slip-proof manner, and the end of the spare wiring is reliably insulated from the surroundings. Further, the terminal cap inserted into the spare wiring can be removed from the end of the spare wiring by a simple work of pulling out the cap.

In the present invention, particularly when the main body is provided with a thin rib projecting from the inner peripheral surface toward the center, the deformation of the rib absorbs the error in the outer diameter size of the spare wiring, and the thicker spare wiring. It can be easily plugged in, and can be securely fixed to a thin spare wire.

Further, in this case, since it is not necessary to prepare a large number of molds for one nominal size, it is not necessary to increase the manufacturing cost. In addition, it is possible to share the auxiliary wirings having different nominal sizes within a certain range, and the number of molds can be further reduced to reduce the cost.

Further, in the present invention, when the main body is formed in an elliptic tube shape, the deformation of the main body can absorb an error in the outer diameter size of the preliminary wiring, and the thicker preliminary wiring can also be used. It can be easily inserted and can be securely fixed to a thin spare wire.

Further, in this case, since it is not necessary to prepare a large number of molds for one nominal size, it is not necessary to increase the manufacturing cost. In addition, it is possible to share the auxiliary wirings having different nominal sizes within a certain range, and the number of molds can be further reduced to reduce the cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of the present invention.

FIG. 2 is a sectional view of a mold for manufacturing the present invention.

FIG. 3 is a front view of the present invention.

FIG. 4 is a perspective view of the present invention.

FIG. 5 is a front view of an extrusion port of a mold for manufacturing the present invention.

FIG. 6 is a front view of the present invention.

FIG. 7 is a perspective view of the present invention.

FIG. 8 is a perspective view of the present invention.

[Explanation of symbols]

 1 body 2 rib

Claims (4)

[Utility model registration claims] 1. A terminal cap made of an insulating synthetic resin, wherein one end of a tubular main body into which a terminal of a wiring is inserted is closed by welding. 2. The terminal cap according to claim 1, further comprising a thin rib protruding from an inner peripheral surface of the main body toward the center. 3. The terminal cap according to claim 1, wherein the main body is formed in a cylindrical tube shape. 4. The terminal cap according to claim 1, wherein the main body is formed in an elliptical tube shape.