JPH07302724A - High-voltage transformer - Google Patents

Abstract

PURPOSE: To obtain a high voltage transformer having a simple structure for a television receiver wherein a peeled end portion of an insulating cover of a high voltage cable which is inserted into a socket can be surely connected with a connecting region in the molded socket of housing formed of insulating material. CONSTITUTION: Each socket 14 protrudes in an opened section of a socket channel 15, and has elasticity and one or more molded tongue parts 26 whose free end portions face the bottom region of the socket channel. An external jacket insulating member 23 on a cable has an optical marking 31 which shows whether a peeled end portion 17 is surely connected with a connecting region 18, together with the upper end portion of the socket.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to the formation of high voltage transformers for television sets, and more particularly to strain relief for high voltage cables conductively connected to the high voltage transformer.

[0002]

2. Description of the Related Art Such a device is described in French Patent No. 8,5.
No. 18,521, and relates to strain relief of a high voltage cable connected to a high voltage transformer of a television receiver. Another device is described in German Patent 38 000 477. Both devices have a socket in an insulating material housing in which the coil winding is located. These sockets and insulating material housings are in most cases integrally formed. Furthermore, structures are known in which an insulating material housing is connected to another housing, which housing contains so-called regulating devices for the focusing voltage and the grid 2 voltage. The structure in the latter meaning is
It is also possible to have the socket partially molded in the adjustment housing. The insulated cable is used to guide the high voltage generated in the coil of the high voltage transformer to the corresponding device of the television receiver. This is typically done by placing a conductive rubber member on the bottom of the socket, which rubber member and housing of insulating material,
Alternatively, it is electrically conductively connected to each high voltage branching device of the coil inside the regulator housing. The external contacts of the high-voltage cable are stripped of the insulation from the end of the above-mentioned insulated cable that is connected to the high-voltage transformer, this end is guided into an open socket, the end of which is Achieved by being pushed sufficiently into the bottom conductive rubber member to project. A gripping mechanism is then inserted into the socket to prevent the high voltage cable from slipping out of the conductive rubber member, which secures the cable in the socket channel. In DE 38 000 477 this is achieved by pressing the sleeve onto the outer jacket of the socket, which is connected to the sleeve and the bracket located in the socket channel As it is pressed against the clamping nose, it bites into the cable insulation,
Prevents the cable from falling out after the sleeve has reached its final position on the socket. In French Patent No. 8,518,521, the end of the cable to be inserted into the socket is provided with a sleeve, the surface of the sleeve comprising one or two longitudinal slots to provide anti-drop strain relief. It If a cable with this sleeve is inserted into the socket channel,
The outer surface of the sleeve is pressed into the cable insulation by the wall of the socket channel, so that the cable with the stripped ends will, after reaching its final position in the socket channel, on the one hand enter into the conductive rubber member. It projects and on the other hand is prevented from falling out by a pressure connection between the socket wall, the sleeve jacket and the cable insulation. Depending on the construction, the outside or inside of the sleeve can be fixed to the socket. There is also known a structure in which the cable is first completely inserted into the socket and then the sleeve described in French Patent No. 8,518,521 is pushed between the inserted cable and the wall of the socket channel.

[0003]

However, when considering the automation of the above process, the gripping mechanism of these two members consisting of the socket and the sleeve is disadvantageous. This is due to the fact that in each case the sleeve must be pressed to a more or less flexible high voltage cable before the actual connection between the cable and the high voltage transformer is made. In this respect, the structure shown in French Patent No. 85 18521, as shown by tests carried out by the applicant,
Satisfactory automation can only be achieved if the socket diameter and the sleeve are manufactured with high accuracy. Therefore, it is an object of the present invention to provide a structure that overcomes the above-mentioned drawbacks of the prior art.

[0004]

The object is to have one or more tongues in which each socket projects into the open cross section of the socket channel and is elastic, the free end of which faces the bottom of the socket channel. It is achieved by
When a cable is pushed into such a socket channel, the elastic tongue that limits the width of the socket channel bends radially. When the cable reaches its final position in the socket channel, the tongue edge bites into the cable insulation, preventing the cable from being pulled out under the influence of pulling forces. If the cable has an optical marking on the outer jacket, the distance between the mark and the top of the socket
It is easy to see if the stripped end of the high voltage cable is securely in contact with the conductive rubber member on the bottom of the socket channel.

As described in claim 2, it is particularly effective that each free end of each lower portion has an arc shape. This ensures easy insertion of the high voltage cable.

According to claim 3, if the apex of the arcuate portion on the free end faces away from the bottom region of the socket channel, no special guiding element is required in the socket channel.

According to claim 4, the insertion of the cable into the socket channel is further facilitated when the width of the tongue is smaller than the diameter of the high voltage cable and the radius of the arcuate portion on the free end is smaller than the cable radius. It This is because during insertion only the edge region digs into the insulation and the central part of the free end lies on the cable insulation. After the high-voltage cable has reached its final position in the socket channel, if the cable is given a force to break the connection, the edge region digs deep into the insulation, which leads to To pull the central area into it,
A very high resistance to the pulling movement of the cable is obtained. When the tongue is constructed according to claim 5, a high elastic force of the tongue is applied to each cable. By constructing the tongue according to the fifth aspect, it is possible to provide each socket having only one tongue for removing strain.

This is described in more detail in claim 6 and has the advantage that each socket need only be accessible from one side to the tongue which narrows the cross section of the socket channel. This makes it possible to limit the total length of the socket to the dimensions required to insulate the contact area and also the height of the arrangement due to the formation of the tongue. Even though the access of the socket is restricted, it is not necessary to specifically configure the socket to be sufficiently long, i.e. beyond the above dimensions, so that the socket can be freely accessed, for example from the opposite side.

[0009]

The present invention is best understood from the detailed description of the preferred embodiment and the accompanying drawings. Figure 6
1 shows a high voltage transformer 10 with strain relief according to the prior art in which a coil structure 11 is arranged inside a housing 12 of insulating material. The right side of this housing 12 is connected to a so-called regulator housing 13 which is also made of insulating material and contains adjustable resistance devices (not shown) for the focusing voltage and the grid 2 voltage. The drawing clearly shows that both the housing 12 of insulating material and the housing 13 of the adjusting device include molded sockets 14.1-14.3. The socket 14.1 connected to the housing 12 of insulating material is shown in cross section, while the sockets 14.2 and 14.3 are shown in side view, the top of the socket 14.3 being covered by the socket 14.2.

The insulated high voltage cable 16.1 is inserted in the socket channel 15 of the socket 14.1. The final position of the cable 16.1 in the socket channel 15 is shown in FIG. 6, with the stripped end 17 of the cable 16.1 clearly made of a conductive rubber which is arranged in the bottom region 19 of the socket channel 15. It projects into the member 18. The conductive rubber member 18 is connected by a pin 20 to a high voltage source (not shown).

Each high voltage cable 16 is gripped at the upper end of each socket channel 15. These areas of sockets 14.1 and 14.2 are shown in the figure. Socket 1
As shown in section 4.1, the sleeve 21 is inserted in the upper end of the socket channel 15 so that it is located between the inner wall 22 of the socket channel 15 and the outer jacket insulation 23 of the high-voltage cable 16.1. A nose 24 formed on the outer jacket of the sleeve 21 and projecting from a cutout 25 in the wall of the socket channel 15 is connected to the socket 14.1. The sleeve 21 has a longitudinal slot (not shown) and has an outer diameter slightly larger than the inner diameter of the socket channel 15. This means that with each high-voltage cable 16 fixed in the socket 14, the inner jacket of the sleeve 21 is pressed against the insulator 23 of the high-voltage cable 16, whereby the high-voltage cable 16 is socketed.
Effectively prevent it from falling out of 14.

FIG. 1 is a side view of a socket 14 according to the present invention having an insulated high voltage cable 16 inserted therein.
The upper end of this socket 14 has a tongue 26 formed in the socket wall by an essentially U-shaped cutout 27. The free end 28 of this tongue 26 is the bottom area of the socket 14.
It faces the direction of 19. Moreover, the free end 28 of the tongue 26 forms an arc, the apex of which is the bottom region 19 of the socket 14.
And is facing in the opposite direction. FIG. 1 further shows that the free end 28 is provided with a bevel 29. In the example construction shown in FIG. 1, free end 28, as shown by high voltage cable 16 seen through cutout 27.
The width of corresponds to the outer diameter of the high voltage cable 16.

The cross-sectional view of FIG. 2 shows how gripping and contact of the high voltage cable 16 in the socket is achieved. From the top end through the socket 14 to the bottom area 19
The socket channel 15 reaching to has an essentially circular cross section in the top region, while the bottom region 19 is somewhat conical.
A conductive rubber member 18 is located at the end of the bottom region 19 and is conductively connected to a high voltage source (not shown). The two tongues 26 already described in connection with FIG. 1 are formed near the upper end of the socket 14. Two tongues
26 is facing. The free end 28 of the tongue 26 faces the inside of the socket channel 15 and
The internal cross section of is narrowed.

Tongue that narrows the cross section of the socket channel 15
This configuration of 26 includes a portion of insulating material 12 with socket 14.
This can easily be achieved by forming a tongue in the injection mold of 13 and 13 according to the wall of the socket and then bending it into the position shown in FIG. 2 by a heat stamping tool to narrow the socket channel 15.

When a high voltage cable 16 having a stripped end 17 of insulation is inserted into the upper end of a socket channel 15, the moment the insulator 23 of the high voltage cable 16 contacts the flange 30 of the tongue 26. , Tongue narrowing the cross section of channel 15
26 is bent in the direction of arrow P. Continued insertion movement of cable 16 into channel 15 will result in outer jacket insulation.
23 is a tongue 26 until the high voltage cable 16 reaches the bottom area 19
It slides along the arc-shaped free end 28, and the peeled end 17 projects into the conductive rubber member 18. This final position is shown in FIG.

High voltage cable in socket channel 15
While inserting 16, before the high voltage cable reaches the final position of the socket channel 15, a resetting movement of the tongue 26 takes place in the opposite direction of the arrow P, whereby the slope 29
(FIG. 1) cuts into the insulator 23 of the high voltage cable 16. This notch is shown schematically in FIG.

FIG. 2 shows that when a pulling force in the Z direction is applied to the high voltage cable 16, the free end 28 of the tongue 26 penetrates deeply into the insulator 23 of the high voltage cable 16.

However, this does not mean that the connection shown in FIG. 2 can only be removed by breaking socket 14 or tongue 26. High voltage cable 16
To remove it, simply move the tongue in the direction of arrow P. This can be accomplished by moving the tongue 26 in the direction of arrow P through the cutout 27 (FIG. 1) with a suitable tool. Another possible way to remove the high voltage cable 16 is to insert a tool through the top opening of the socket channel 15 and push the flange 30 of the tongue 26 to remove it from the insulator 23 of the high voltage cable 16.

In all examples, the stripped end 17 of the high voltage cable 16 is shown to be in contact with the conductive rubber member 18 so that the stripped end 17 has a conductive rubber member 18. It is effective to provide a marking on the outer jacket of the high-voltage cable 16 to indicate whether or not the needle is reliably pierced, and to consider all tolerances. In this example, the marking 31 is a coloring. When the high voltage cable 16 reaches its final position in the socket channel 15, the lower end 32 of the color marking is no longer visible at the upper end of the socket 14 so that a positive contact with the conductive rubber member 18 is made. Be seen. In the structure example shown in FIG. 2, the peeled end 17 of the high-voltage cable 16 penetrates deeply into the conductive rubber member 18, so that the marking 31
The lower end of is located below the upper edge of the socket 14.

FIG. 3 shows a cross section taken along the line AA in FIG. This figure shows that the width of the free end 28 is smaller than the outer diameter of the high voltage cable 16. The radius of the free end 28 is also smaller than the radius of the high voltage cable 16. This ensures that only the edge area 33 of the free end 28 is
Can be cut into the insulator 23. High voltage cable 16
When inserted, only the central area of the free end 28
Touch the outer jacket of. This structure has the advantage that the insertion can be performed with an essentially low insertion force. However, this structure does not impair the safety of the high voltage cable 16 against withdrawal. When the pulling force Z shown in FIG. 2 is applied to the high voltage cable 16, the edge region 33 of the free end 28 penetrates deeply into the insulator 23 of the high voltage cable 16 and the central region of the free end 28 also. Further, the high voltage cable 16 is deeply embedded in the insulator 23.

FIG. 4 shows another side view of socket 14. Unlike the one shown in FIG. 1, the tongue 26 in FIG. 4 is trapezoidal, and the width of the transition region 34 between the tongue 26 and the socket 14 is the tongue.
Larger than the width of the free end 28 of 26. Also, in the embodiment of FIG. 4, the free end 28 of the tongue 26 is arcuate and has a width matching that of the high voltage cable 16, as shown in the view seen through the cutout 27 in the wall of the socket 14. Have Figure 4
In this embodiment, the width of the high voltage cable 16 and the width of the free end 28 need not match. The width of the free end 28 may be narrower than the diameter of the cable 16 to achieve the advantages described in the structure of FIG.

If the tongue 26 is trapezoidal, the strain relief of each socket 14 can be done by one tongue 26 as shown in FIG. This is a single trapezoid tongue 26
Is already applying a sufficient spring force to the high voltage cable 16. This is because the sockets 14.2, 14.3 formed therein do not necessarily have to extend beyond the upper end 35 of the adjusting structure 13 with respect to the adjusting structure 13 of FIG. 6, but by a single trapezoidal tongue 26 (FIG. 4). , They are limited to the longitudinal dimension necessary to insulate the connection in the bottom area 19 and to form the tongue 26 in the top area of the socket, opposite the housing 12 of insulating material of each socket 14.2, 14.3. Is likely to occur.

Furthermore, it should be pointed out that the structure of the tongue 26 is not necessarily limited to one or two. In the construction example not shown, three or four tongues 26 can be formed in the socket channel 15 in different configurations.

Furthermore, the shape of the free end 28 is not limited to the arc shape described with reference to FIGS. In this respect, it has to be pointed out that the apex of the free end arc can also face the bottom region 19 of the socket. However, in that case it is necessary to additionally provide guiding elements inside the socket channel 15 so that the high-voltage cable 16 does not slip in the socket channel 15.
The application of the present invention is not limited to the connection between the high voltage cable and the high voltage transformer in the television receiver. For example, the connection between the high voltage cable of the television receiver and the anode cup can be made according to the invention. Similarly, low voltage connections can be equipped with strain relief according to the present invention.

Although the present invention has been described with reference to particular embodiments, those skilled in the art can make various modifications, substitutions, eliminations and changes without departing from the scope of the present invention. It will be appreciated that equivalents to the invention may be performed instead. Accordingly, the invention is limited only by the appended claims.

[Brief description of drawings]

FIG. 1 is a side view of a socket according to the present invention.

FIG. 2 is a sectional view of a socket according to the present invention.

3 is a sectional view taken along line AA of FIG.

FIG. 4 is a side view of another embodiment corresponding to FIG.

5 is a sectional view of another embodiment corresponding to FIG.

FIG. 6 is a schematic diagram of a high voltage transformer according to the prior art.

Claims (6)

[Claims] 1. A housing portion formed of an insulating material having one or more molded sockets, a connection area formed inside the molded sockets, and a cable reaching its final position in the socket. And a high voltage cable having an insulation coating having a stripped end of the insulation coating that contacts the connection area when each socket is opened to a socket channel. An outer jacket insulator on a cable, the outer end of which has one or more molded tongues projecting into the cross section and which is elastic and whose free end faces the bottom region of the socket channel. Television receiver, characterized in that it has an optical marking which, in cooperation with the upper end of the socket, indicates whether the part is securely connected to the connection area. High voltage transformer for the machine. 2. The high voltage transformer according to claim 1, wherein the free end of the tongue is arcuate. 3. A high voltage transformer according to claim 2, wherein the apex of the arcuate portion of the free end of the tongue faces in a direction opposite to the bottom region of the socket channel. 4. The high voltage transformer of claim 3 wherein the width of the tongue is less than the diameter of the high voltage cable and the radius of the arcuate portion on the free end is less than the radius of the high voltage cable. 5. The high voltage transformer of claim 1 wherein each tongue is trapezoidal and the transition region from the tongue to the socket wall is wider than the free end of the tongue. 6. The high voltage transformer according to claim 5, wherein each socket has only one tongue.