JPH0565034U - Switch bushing - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the terminal from rotating, inching, and damaging the insulator. 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 adhesive synthetic 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 rotation of terminals connected to the switch.

[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 implanted at each vertex of a square of case 1, 3 is a porcelain tube, 4 is a disk-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 in 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 3, 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 of the above, and is fitted into the above-mentioned missing portion 9. Reference numeral 12 denotes a space formed in the protrusion 11, which is formed for the productivity of the member 10. Reference numeral 13 denotes two concave portions formed on the upper surface of the member 10, which are formed at intermediate positions between the both protruding portions 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 a protrusion that is provided on both sides of the peripheral surface of the substrate 15. The substrate 15 is placed on the member 10 and the protrusion 16 is a recess. It fits in 13.

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 projection 16 of the substrate 15 fits into the recess 13 of the member 10 to project the projection 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 projecting portion formed on the front and rear sides of the upper portion of the terminal conductor 18, and 22 includes a projecting 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 bisphenol epoxy resin, and prevents the terminal 14 from rattling or inching.

[0007]

[Problems to be solved by the device]

 In the case of the conventional bushing, the porcelain bushing 3 is strong against the compressive force from the outside, but is weak against the expansion force from the inside, that is, the force in the pulling direction, and the thermal expansion coefficient of the porcelain bushing 3 is small. On the other hand, since the synthetic resin 22 has a large coefficient of thermal expansion and the difference in the coefficient of thermal expansion is large, there is a problem that the porcelain tube 3 is broken by the cooling / heating cycle. The present invention has been made in view of the above points, and an object of the present invention is to provide a switch bushing in which rotation and inward movement of a terminal and damage to an insulator tube are prevented.

[0008]

[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 a 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 is formed so as to project on the inner peripheral surface of the member and that fits into the cutout portion, a terminal that is mounted on the upper surface of the member, and the peripheral surface of the insulator tube in the cutout portion. And an adhesive synthetic resin filled in the gap between the protrusion and the protrusion.

[0009]

[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 lacking portion of the peripheral surface of the tip of the porcelain bushing, the anti-rotation member The upper terminal does not rotate, and since the adhesive synthetic resin is filled in the gap between the peripheral surface of the insulating porcelain tube and the protrusion, the inching of the terminal is prevented and the synthetic resin Since the grease is located on the outer circumference of the porcelain bushing, no pressure is applied to the porcelain bushing from the inside, and the porcelain bushing is not damaged by the cold cycle.

[0010]

【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 ones, 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 between the conductor 18 and the inner surface of the porcelain insulator 3 are not provided, and the peripheral surface of the half-moon-shaped lacking portion 9 at the tip of the porcelain insulator 3 and the inner peripheral surface of the anti-rotation member 10 are provided. That is, the adhesive synthetic resin 23 is filled in the gap between the half-moon shaped protrusion 11.

Therefore, although the terminal 14 does not rotate as in the conventional example, the synthetic resin 23 completely eliminates the gap between the porcelain tube 3 and the detent member 10, and the detent member 10 is loosened. There is no sticking or jerking. Moreover, since the synthetic resin 23 is located on the outer periphery of the porcelain bushing 3, the porcelain bushing 3 is not damaged by thermal expansion.

[0012]

[Effect of the 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 in 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 adhesive synthetic resin 23 is filled in the gap between the peripheral surface of the porcelain tube 3 of the cutout portion 9 and the protrusion 11, the inching of the terminal 14 can be completely prevented, and the synthetic Since the resin 23 is located on the outer circumference of the porcelain bushing 3, pressure from the inside is not applied to the porcelain bushing 3 and damage to the porcelain bushing 3 due to the cooling / heating cycle can be prevented.

[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 insulator.

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 Synthetic 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 into the cutout, a terminal that is placed on the upper surface of the member, and an adhesive that fills the gap between the peripheral surface of the insulator of the cutout and the projection. Bushing for switch with a synthetic resin.