JPH0354065Y2 - - Google Patents

Description

[Detailed description of the invention] (A) Industrial application field The present invention relates to a sealing device for terminal boxes, etc. for testing high voltage electric power meters.

(B) Conventional Technology Conventionally, as shown in FIG. 1, a terminal box 1 for testing a high-voltage electric power meter has a sealing ring 5 provided on a lid 2 and a sealing hole 4 of a sealing screw 3 connected with a sealing wire 6. It was sewn and sealed with sealing resin (or sealing lead)7.

However, once the seal is removed, the lid 2 can be opened easily with a screwdriver, etc., so this seal is tampered with.
There were cases where the test terminal box 1 was opened and the terminals were manipulated, resulting in unauthorized use of power.

Therefore, there has been a demand for a sealing tool that cannot easily open the lid 2 of the test terminal box 1 even if the seal is tampered with.

(C) Problems that the invention aims to solve The invention solves the problem of sealed caps that cannot be opened with ordinary tools such as screwdrivers or radio pens without leaving any marks, even if the seal is tampered with. It is something that can be provided economically.

(D) Means for solving the problem As shown in Figures 2, 3, and 4, there is a screw hole 8 in the center of the bottom, a sealing hole 9 in the upper part of the cylinder, and a ring slit 12 in the outer periphery of the lower part of the cylinder. The collar portion 14 shown in FIGS. 5 and 6 is inserted into the threaded hole 8 of the metal cylinder 10, which has a plurality of vertical slits 13 extending from the cylinder mouth to the ring slit on the outer periphery of the cylinder to form a flat portion 15. Insert the collar washer 16 which is to be latched by the collar washer 16, and insert the tightening screw 17 having the head 11 shown in FIG. A sealing cap main body 2 is formed by inserting a spring washer 19 shown in FIGS. 7 and 8 that snaps onto the shaft portion 18 of the tightening screw 17 inserted through the collar portion 14.
0 and 1 in FIG. 9, which are inserted into the metal cylinder 10
This sealing cap has a structure consisting of an elastic metal sealing plate 21 shown in FIG.

Although the number of vertical slits 13 is four in FIG. 4, the number can be increased or decreased as required. This vertical slit, together with the ring slit,
When opening the package later, it is structured so that it can be crushed by squeezing it with pliers or the like, and the upper part can be removed from the ring slit.

Further, the height of the collar portion 14 of the collar washer 16 shown in FIG.
The height of the metal cylinder 10 is made slightly higher than the hole height of the screw hole 8 at the center of the bottom of the 0, so that the metal cylinder 10 rotates when the tightening screw 17 is tightened to the test terminal box 1.

The spring washer 19 in FIGS. 7 and 8 is inserted into the metal cylinder 10 through the collar washer 19 and the tightening screw 17, as shown in FIG. The sealing cap body 20 is assembled by inserting the sealing cap body 20 against the spring.

The sealing plate 21 shown in FIGS. 9 and 10 is made of an elastic metal plate with a curved outer periphery. When inserted into the metal cylinder 10 as shown in FIG. The structure is such that it is firmly attached to the body and cannot be easily removed once it is inserted.

(E) Function As shown in Fig. 11, the seal cap body 20 of the present invention shown in Fig. 2 is installed in the existing terminal box 1 for high voltage meter testing in place of the conventional seal screw 3 shown in Fig. 1. , attach.

That is, by applying the threaded part of the tightening screw 17 of the sealing cap main body 20 shown in FIG. The main body 20 is a first
As shown in FIG. 1, it is screwed onto an instrument terminal box 1.

In this case, the metal cylinder 10 is rotatably supported by the collar portion 14 of the collar washer 16, as shown in FIG.

Next, as shown in FIG. 12, the sealing plate 21 is pushed into the metal cylinder 10 using a screwdriver or the like against the elasticity of the sealing plate 21.
1 is hooked inside the metal cylinder 10, and the metal cylinder 10
It cannot be extracted unless it is broken.

After that, as shown in FIG.
Seal the sealing ring 5 with the sealing wire 6 and sealing resin 7.
(or sealing lead).

(F) Effects of the invention As mentioned above, with the sealed cap of the invention,
When the test terminal box 1 is sealed, the head 11 of the tightening screw 17 is located at the inner bottom of the metal cylinder 10, as shown in FIG. Since it is covered so that it cannot be removed, the tightening screw 17 cannot be unscrewed even if a screwdriver, pliers, etc. are used.

Furthermore, even if the metal cylinder 10 is rotated, since the metal cylinder 10 is rotatably attached to the collar part 14 of the collar washer 16, the tightening screw 17 will not rotate with the metal cylinder 10 and will follow the metal cylinder 10. The tightening screw 17 cannot be unscrewed.

Therefore, even if a third party tampers with the sealing wire 6 or the sealing resin 7, the tightening screw 17 can be unscrewed.
Since the lid 2 cannot be opened, it is possible to prevent a third party from opening the lid 2 of the test terminal box 1 of the high-voltage meter and tampering with the inside.

Moreover, in the present invention, no special tool is required to screw in and unthread the tightening screw 17, and a normal screwdriver bar can be used, so there is no need to carry extra tools.

Next, when opening the test terminal box 1, press the metal cylinder 10 with pliers to open the vertical slit 1.
3 and the ring slit 12, the metal cylinder 10 is easily broken, the sealing plate 21 is removed, and the tightening screw 1 is removed.
Since the head 11 of 7 appears, the lid 2 can be opened by unscrewing the tightening screw 17 with a screwdriver.

The sealing cap of this invention has a simple structure,
Economical and without the need for special tools.
It is possible to ensure the sealing of test terminal boxes for high-voltage meters.

(G) Other Examples The sealing cap of the present invention can be used not only to seal test terminal boxes of high-voltage meters, but also to seal terminal boxes of low-voltage electricity meters. It can be widely used for sealing parts of operation boxes, etc., where opening/closing is prohibited by anyone other than a specific person.

[Brief explanation of the drawing]

Fig. 1 is an explanatory perspective view of a conventional sealing part of a terminal box for high-voltage meter testing, Fig. 2 is an explanatory partial longitudinal cross-sectional view of the sealing cap of the present invention, and Fig. 3 is an explanatory longitudinal cross-sectional view of a metal cylinder. , FIG. 4 is a plan view of the same, FIG. 5 is an explanatory front view of the collar washer, FIG. 6 is a plan view of the same, and FIG.
The figure is a front view for explaining the spring washer, FIG. 8 is a plan view of the same, FIG. 9 is a front view of the sealing plate for explanation, FIG. 10 is a plan view of the same, and FIG. 12 are partial sectional views for explaining the tightening state of the present invention. 1 is the test terminal box, 2 is the same lid, 3 is the sealing screw,
4 is the sealing hole, 5 is the sealing ring, 6 is the sealing wire, 7
1 is a sealing resin, 8 is a screw hole, 9 is a sealing hole, 10 is a metal cylinder, 11 is a head of the tightening screw 17, 12 is a ring slit of the metal cylinder 10, 13 is a metal cylinder 10
vertical slit, 14 is the collar part of the spring washer 16,
15 is the same flat part, 16 is a collar washer, 17 is a tightening screw, 18 is a coaxial part, 19 is a spring washer, 20
is the sealing cap body, 21 is the sealing metal plate.

Claims (1)

[Scope of claim for utility model registration] A screw hole in the center of the bottom, a sealing hole in the top of the cylinder,
A metal cylinder has a ring slit on the outer periphery of the lower part of the cylinder and a plurality of vertical slits on the outer periphery from the cylinder mouth to the ring slit.The collar part is inserted into the threaded hole of the metal cylinder, and the collar washer that is latched at the flat part is inserted. Then, a tightening screw having a head that is inserted into the collar portion of the collar washer and hooked to the flat portion is inserted, and the screw is inserted into the shaft portion of the tightening screw that is inserted through the collar portion. A sealing cap consists of a sealing cap body with a spring washer inserted therein, and a sealing plate that is inserted into a metal cylinder.