JPH0611229U - Switch bushing - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents terminal rotation, inching, and damage to the insulator,
Improve productivity. A half-moon shaped cutout portion 9 formed on a peripheral surface of a cylindrical tip portion of the porcelain insulator 3, an annular detent member 10 fitted to the tip portion, and an inner peripheral surface of the member 10. Between the half-moon-shaped projection 11 that is formed to project and fit into the cutout portion 9, the terminal 14 placed on the upper surface of the member 10, and the peripheral surface of the insulator tube 3 of the cutout portion 9 and the projection portion 11. And the photo-curable resin 23 filled in the gap.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switch bushing designed to prevent a terminal connected to the switch from rotating.

[0002]

[Prior art]

 A conventional switch bushing has a structure as shown in FIGS. In these figures, 1 is a switch case, 2 is a stud planted at each vertex of a square of case 1, 3 is a porcelain tube, 4 is a disc-shaped substrate of porcelain tube 3, and 5 and 6 are An annular spacer and packing interposed between the case 1 and the substrate 4, 7 is a holding metal fitting in which each through hole is inserted into the stud 2, 8 is screwed to the stud 2, and the substrate 4 is fixed via the holding metal fitting 7. It is a nut.

Reference numeral 9 is a half-moon-shaped notch formed on both sides of the peripheral surface of the cylindrical tip of the porcelain bushing, 10 is an annular detent member fitted to the tip of the porcelain bushing, and 11 is a member 10. It is a half-moon-shaped projection that is formed on both sides of the inner peripheral surface of the lower surface, and is fitted into the lacking portion 9. Reference numeral 12 is a space formed in the protrusion 11, and is formed for filling a resin described later. Reference numeral 13 denotes two concave portions formed on the upper surface of the member 10, which are formed at positions between the protrusions 11.

Reference numeral 14 is a rectangular plate-shaped terminal to which an external connection line is connected. Reference numeral 15 is a disk-shaped substrate that is the base of the terminal 14, and 16 is protrusions provided on both sides of the peripheral surface of the substrate 15. The base 15 is placed on the member 10 and the protrusions 16 are recessed. It fits in 13.

Reference numeral 17 is a packing interposed between the upper surface of the porcelain bushing 3 and the lower surface of the substrate 15, 18 is a terminal conductor below the substrate 15, and 19 is a seat plate through which the conductor 18 is inserted and abuts the lower surface of the porcelain bushing 3. Reference numeral 20 denotes a nut screwed to the lower end of the conductor 18, and the conductor 18 is pulled downward by fastening the nut 20 so that the protrusion 16 of the substrate 15 fits into the recess 13 of the member 10 and the protrusion of the member 10. 11 is fitted in the lacking portion 9 of the porcelain bushing 3, and the terminal 14 does not rotate.

Reference numeral 21 denotes a protrusion formed on the front side and the rear side of the upper portion of the terminal conductor 18, and 22 includes a protrusion portion 21, which is filled between the peripheral surface of the upper portion of the conductor 18 and the inner surface of the upper portion of the insulator 3. It is a synthetic resin such as a bisphenol epoxy resin and prevents the rattling or inching of the terminal 14.

However, while the porcelain insulator 3 is strong against the compressive force from the outside, it is weak against the expansion force from the inside and the force in the pulling direction, and the coefficient of thermal expansion of the porcelain insulator 3 is small. Since the synthetic resin 22 has a large coefficient of thermal expansion and the difference in the coefficient of thermal expansion is large, the porcelain tube 3 is broken by the cooling / heating cycle. Therefore, in order to prevent the rotation and inching of the terminal 14 and the damage of the porcelain bushing 3, the synthetic resin 22 is not filled, and a bisphenol-based epoxy resin such as a bisphenol-based epoxy resin is used at a room temperature in a gap between the missing portion of the porcelain bushing and the protrusion of the rotation preventing member. Alternatively, it is conceivable to fill it with a thermosetting synthetic resin.

[0008]

[Problems to be solved by the device]

 If the synthetic resin filled in the gap is room temperature curable, it takes 12 to 24 hours to cure, and if it is heat curable, it takes 4 to 8 hours, both of which take a long time to cure, and In the case of heat curing, there is a restriction that the heating temperature must be 80 ° C. or lower in order to prevent thermal deterioration of packing and the like. Furthermore, since it takes several hours to cure, flow production on the conveyor line (eg, tact pitch of 20 minutes) cannot be performed, and bushing assembly and resin filling work are performed outside the line.

In addition, since it is an operation outside the line, it requires a lot of space such as an assembly place outside the line, a storage place for the assembly, and even in the case of a room temperature curable synthetic resin, the wet temperature, the temperature, etc. A furnace must be used to prevent quality variations due to the effects of, and a large-scale furnace is required as equipment. Moreover, there are problems in that storage, transportation, transshipment, and other work are required, and assembly errors easily occur due to work outside the line. The present invention has been made in consideration of the above points, and an object of the present invention is to provide a switch bushing in which a resin is hardened in a short time and productivity is improved.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a switch bushing according to the present invention comprises a half-moon shaped cutout portion formed on the peripheral surface of a cylindrical front end portion of a porcelain bushing and an annular rotation member fitted to the tip end portion. Retaining member, a half-moon-shaped projection that protrudes from the inner peripheral surface of the member and fits into the notch, a terminal that is placed on the upper surface of the member, and a peripheral surface of the insulator of the notch. And a photocurable resin filled in the gap between the protrusion and the protrusion.

[0011]

[Action]

 In the switch bushing of the present invention constructed as described above, since the half-moon-shaped projection of the anti-rotation member is fitted to the half-moon-shaped notch on the peripheral surface of the tip of the porcelain bushing, the anti-rotation member Since the upper terminal does not rotate and the gap between the peripheral surface of the porcelain bushing at the lacking part and the protrusion is filled with the photo-curable resin, the terminal is prevented from moving and the resin is Since it is located on the outer circumference of the porcelain porcelain, no pressure is applied to the porcelain porcelain from the inside, and the porcelain porcelain is not damaged by the heat cycle.

Moreover, since the photo-curable resin is used, the curing time is extremely shortened to a few minutes, which enables flow production on the conveyor line, and does not require a space outside the line to install a furnace. Also, it does not require operations such as storage, transportation, and transshipment, and assembly mistakes are unlikely to occur.

[0013]

【Example】

 One embodiment will be described with reference to FIG. In the figure, the same reference numerals as those in FIGS. 2 to 5 designate the same or corresponding parts, and the point that this embodiment is different from the conventional example is as follows. The protrusion 21 of the conventional example and the synthetic resin 22 between the conductor 18 and the inner surface of the porcelain bushing 3 are not provided, and the peripheral surface of the half-moon-shaped notch 9 at the tip of the porcelain bushing 3 and the inside of the anti-rotation member 10. The photo-curable resin 23 is filled in the gap between the semicircular protrusion 11 on the peripheral surface.

The photocurable resin 23 is of a type that is cured by irradiation with ultraviolet rays, and is, for example, an acrylic-liquid type, and ultraviolet rays generate a wavelength of 300 to 400 nm by a high voltage mercury lamp. Irradiate. As a result of the experiment, it was possible to cure the resin 23 for one bushing in the irradiation time of 3 minutes. Therefore, for a switch using 6 bushings, it takes a short time of 18 minutes, and flow production on the conveyor line becomes possible.

[0015]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects. Since the half-moon-shaped projection 11 of the rotation-preventing member 10 is fitted to the half-moon-shaped lacking portion 9 on the peripheral surface of the tip end of the porcelain bushing 3, the terminal 14 on the rotation-preventing member 10 does not rotate, and moreover, Since the photo-curable resin 23 is filled in the gap between the peripheral surface of the porcelain tube 3 of the cutout portion 9 and the projection 11, the inching of the terminal 14 can be completely prevented and the photo-curing can be prevented. Since the elastic resin 23 is located on the outer circumference of the porcelain bushing 3, no pressure is applied to the porcelain bushing 3 from the inside, and damage to the porcelain bushing 3 due to a cooling / heating cycle can be prevented.

In addition, since the photo-curable resin 23 is used, the curing time is extremely shortened to about several minutes, the flow production on the conveyor line becomes possible, and the space outside the line is not required, and the furnace Assembling errors can be prevented without the need for work such as installation, storage, transportation, and transshipment.

[Brief description of drawings]

FIG. 1 is a cutaway front view of an embodiment of the present invention.

FIG. 2 is a cut front view of a conventional example.

3A and 3B are a partially cut front view and a partial plan view of a porcelain bushing.

4A, 4B and 4C are plan views of the detent member, A- in FIG.
It is a sectional view and a bottom view of the 0-A 'line.

5A, 5B and 5C are a front view, a plan view and a side view of a terminal.

[Explanation of symbols]

 3 Insulator 9 Notch 10 Rotation Stopper 11 Projection 14 Terminal 23 Photocurable Resin

Claims (1)

[Scope of utility model registration request] 1. A half-moon-shaped cutout portion formed on a peripheral surface of a cylindrical tip portion of a porcelain insulator, an annular detent member fitted to the tip portion, and protruding from an inner peripheral surface of the member. A half-moon-shaped projection that is formed and fits in the cutout portion, a terminal placed on the upper surface of the member, and light filled in the gap between the peripheral surface of the insulator tube of the cutout portion and the projection portion. A switch bushing with a curable resin.