JPH05941Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to an improvement of a meter sealing device used in a power meter or the like.

(Background of the invention) Conventionally, meters have been used for the purpose of protecting meters and making them easy to discover even if they are opened.
Various sealing devices have been implemented or proposed.

FIG. 3A is a front view of a power meter using an example of the prior art, and FIG. 3B is a perspective view of the sealing device shown in FIG. 3A.

A display device (not shown) for displaying usage amount is housed in the base 2 of the electricity meter 1, and the display device and the like are covered with a glass cover 3. A frame member 4 that is joined to the base 2 is attached around the glass cover 3. The base 2 and the frame member 4 are provided with a base side lug 5 and a frame side lug 6, respectively.
are welded, and the glass cover 3 is joined to the base 2 by tightening a sealing screw 7 inserted through the frame side lug 6 and screwed into the base side lug 5 via the frame member 4. Through holes 9 and 10 are provided in the head 8 of the sealing screw 7 and the frame side lug 6, respectively, and both ends of the sealing wire 11 routed so as to be inserted into the through holes 9 and 10 are sealed with lead. The sealing is performed by connecting by 12.

Japanese Patent Publication No. 61-49672 also proposes a sealing device in which a cover is screwed together with a strip plate to a meter storage box, and both ends of the strip plate are connected by sealing hollow blocks.

However, Fig. 2 Conventional Example and Special Publication Publication No. 61-
The device disclosed in Japanese Patent No. 49672 has a problem in that the seal can be easily removed by cutting the seal line 11, the strip plate, etc.

4A is a front view of a power meter using another example of the prior art, FIG. 4B is a perspective view of the sealing device shown in FIG. 4A, and FIG. 4C is a A and B
FIG. 3 is a sectional view of the sealing device shown in FIG. Note that the same parts as in FIGS. 3A and 3B are designated by the same reference numerals.

A flange portion 13 corresponding to the frame side lug 6 of FIGS. 3A and B is formed on the frame member 4, and the glass cover 3 is inserted through the flange portion 13 of the frame member 4 and screwed onto the base side lug 5. It is joined to the base 2 by tightening the sealing screw 14 inserted. The head 15 of the sealing screw 14 is provided with an annular recess 16 . After tightening the sealing screw 14, when the sealing cap 17 is pushed over the head 15, the sealing cap 17
The inner periphery of a retaining ring 19, which is accommodated in the inner annular groove 18 and has elasticity in the radial direction, is fitted into the annular recess 16 of the sealing screw 14, and sealing is performed by this fitting.

Further, a sealing device using a sealing cap as described above is already known from Japanese Patent Publication No. 49673/1983.

However, Fig. 4 Conventional Example and Special Publication 1986-
The seal according to Publication No. 49673 can also be easily removed by prying open the sealing cap.

(Object of the invention) The object of the invention is to solve the above-mentioned problems and provide a meter sealing device that is permanently sealed unless destroyed.

(Characteristics of the invention) In order to achieve the above object, the present invention provides a breaking part that is broken by a predetermined tightening force between the tightening force application end and the head of the sealing screw, The part of the sealing screw excluding the tightening force application end and the broken part is covered with a protective case on the outside of the base and frame members together with the base side lug and the frame side lug, and the head of the sealing screw in the protective case is covered with a protective case. The sealing cap, which is the part to be covered, is fixed to the frame side lug by tightening the sealing screw, so that the sealing screw can hardly be touched from the outside after the broken part is broken. .

(Embodiment of the invention) Fig. 2A is a front view of a watt-hour meter in which an embodiment of the invention is used, and Fig. 2B is a side view of the watt-hour meter shown in Fig. 2A. be.

The power meter 20 has a base 21 fixed to a predetermined position such as a wall. Base 21 has
A display device (not shown) for displaying the usage amount is housed therein, and the display device and the like are covered with a glass cover 22 . 23 is a frame member that joins the glass cover 22 to the base 21, and 24 is a terminal board to which each wiring (not shown) is connected.

The glass cover 22 is joined to the base 21 via the frame member 23 by sealing devices 25, 26, 27, and 28, which will be described later, to seal the internal display device and the like.

FIG. 1A is a sectional view showing an embodiment of the present invention used in the examples shown in FIGS. 2A and 2B, and shows the state before the breaking portion is broken. 1st
FIG. B is a sectional view of the embodiment illustrated in FIG. 1A, showing the state after sealing with the broken portion broken.

Sealing devices 25 to 28 in Fig. 2 A and B
have the same structure, and the first
In Figures A and B, the sealing device 25 will be described.

A seal mounting fitting 32 is welded to the base 21, on one side of which a base side lug portion 29 is formed, and on the other side a bottom portion 31 of the protective case 30 is formed, and to the frame member 23, a frame side lug portion is also welded on one side. 33 is formed on the other hand, and a sealing metal fitting 35 on which the side surface portion 34 of the protective case 30 is formed.
is welded. Then, the base side lug part 29
is provided with a screw hole 37 into which the sealing screw 36 is screwed, and the frame-side lug portion 33 has a sealing cap 38 joined to the outside thereof as well as a screw hole 37 into which the sealing screw 36 is screwed.
A through hole 39 is provided through which the screw 6 is inserted. 40
is a packing that is held between the base 21 and the peripheral edges of the glass cover 22.

The sealing cap 38 is attached to the head 41 of the sealing screw 36.
The head 41 is formed to cover the side surface of the head 41.
is provided with a tightening force applying end 42 that projects outward from the sealing cap 38. A breaking portion 43 is provided between the tightening force applying end 42 and the head 41, and is broken when a predetermined tightening force is applied to the tightening force applying end 42.

The sealing operation will be explained below with reference to FIGS. 1A and 1B.

When the base 21 and the glass cover 22 are joined with the packing 40 in between and the frame member 23 is attached, the seal fitting 32 and the seal fitting 35 are assembled as shown in FIG. 1A, and the base side lug part At the same time, the screw hole 37 of No. 29, the frame side lug portion 33 and the through hole 39 of the sealing cap 38 are arranged coaxially, and at the same time, the base side lug portion 29 and the frame side lug portion 33 are surrounded within the protective case 30. It becomes stuck.

A sealing screw 36 is inserted into the through hole 39,
When screwed into the screw hole 37, the tightening force applying end 42
By rotating the seal cap 38, the frame-side lug part 33, and the base-side lug part 29 are tightened in the direction toward each other, and the seal mounting fitting is attached via the frame member 23 to which the seal fitting 35 is welded. 32
The base 21 and the glass cover 22, which are welded together, are joined together.

After sufficient tightening is performed by rotating the tightening force applying end 42 as described above, when further tightening force is applied, the breaking part 43 is broken and the tightening force applying end 42 is It is separated from the head 41. Thereby, the sealing device 25 is sealed as shown in FIG. 1B.

After sealing, the sealing screw 36 has the bottom part 31, the side part 34, and the sealing cap 3, except for the outer end surface of the head 41.
8, and the tightening force application end 42 is broken and separated.

(Modification) In the embodiment illustrated in FIGS. 1A and 1B, the protective case 30 covers the sealing screw 36 except for the outer end surface of the head 41.
It is also possible to make the entire sealing screw inaccessible from the outside by attaching a cover member or filling it with a sealing member such as resin or lead. Further, the sealing devices 25 to 28 are not limited to the electricity meter 20,
It can also be used for gas meters, water meters, etc. The number of sealing devices provided in one meter is not limited to four, but may be an even number such as two.

(Effects of the invention) As explained above, according to the invention, a breaking part that is broken by a predetermined tightening force is provided between the tightening force application end and the head of the sealing screw, The part of the sealing screw excluding the tightening force application end and the broken part is covered with a protective case on the outside of the base and frame members together with the base side lug and the frame side lug, and the head of the sealing screw in the protective case is covered with a protective case. Since the sealing cap, which is the part to be covered, is fixed to the frame side lug by tightening the sealing screw, it can be permanently sealed as long as the sealing cap of the protective case is not destroyed. Further, when it is desired to break the seal, it is only necessary to destroy the sealing cap of the protective case, and there is no need to destroy the base-side lug, the frame-side lug, the base, or the frame member, so the seal can be easily broken.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional view showing an embodiment of the present invention in a state where the seal is in progress, FIG. 1B is a cross-sectional view showing the completed sealing state of the embodiment shown in FIG. 1A, and FIG. 2B is a side view of the example illustrated in FIG. 2A; FIG. 3A is a front view of the watthour meter showing an example of use of the prior art; Figure B is a perspective view showing the part shown in Figure 3A, Figure 4A is a front view showing another usage example of the prior art, and Figure 4B is a perspective view showing the part shown in Figure 4A. , FIG. 4C is a cross-sectional view of the sealing device shown in FIGS. 4A and 4B. 20...Power meter, 21...Base, 22...
Glass cover, 23... Frame member, 25-28...
Sealing device, 29... Base side lug part, 30... Protective case, 31... Bottom part, 32... Seal mounting bracket, 33... Frame side lug part, 34... Side part, 35
...Sealing metal fitting, 36...Sealing screw, 37...Screw hole, 38...Sealing cap, 39...Through hole, 4
1...Head, 42...Tightening force application end, 43...
Broken part.

Claims (1)

[Scope of utility model registration request] a base side lug provided on the outer side of the base;
a frame-side lug provided on the outer side of the frame member of the cover at a position facing the base-side lug, and a screw hole is formed in either the base-side lug or the frame-side lug, and a through hole is formed in the other; In a meter sealing device having a sealing screw that is formed with a head and a threaded portion at both ends and is inserted through the through hole and screwed into the screw hole, the tightening force applying end and the head of the sealing screw are connected to each other. A broken part that is broken by a predetermined tightening force is provided between the parts, and the part of the sealing screw excluding the tightening force application end and the broken part is attached to the base and the frame side together with the base side lug and the frame side lug. The frame member is covered with a protective case on the outside, and a sealing cap, which is a part of the protective case that covers the head of the sealing screw, is fixed to the frame side lug by tightening the sealing screw. meter sealing device.