JPH05940Y2 - - 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.

The base 2 of the electricity meter 1 accommodates a display device (not shown) for displaying the usage amount, and the display device etc. 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. A base side lug 5 and a frame side lug 6 are welded to the base 2 and the frame member 4, respectively, and the glass cover 3 is welded to the frame member 4.
By tightening the sealing screw 7 which is inserted through the frame side lug 6 and screwed into the base side lug 5,
It is joined to the base 2. Head 8 of the sealing screw 7
Through-holes 9 and 10 are provided in the frame-side lugs 6, respectively, and both ends of a sealing wire 11 routed so as to be inserted through the through-holes 9 and 10 are connected by a sealing lead 12. The seal will be sealed.

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 joined by sealing hollow blocks.

However, Fig. 3 Conventional Example and Special Publication 1986-
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.

The frame member 4 is formed with a flange portion 13 corresponding to the frame side lug 6 of FIGS. 3A and B, 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 cannot be easily removed from the meter.

(Characteristics of the invention) In order to achieve the above object, the present invention connects the base side lug and the frame side lug with a center tension type rivet, and separates the center axis using the center axis tension type rivet. Joined together with a base side washer member and a frame side washer member surrounding both heads of the axial tension type rivet, and on the inside of each of the washer members joined by the axis separation of the axis tension type rivet,
The present invention is characterized in that a sealing member covering the head of each of the mandrel tension type rivets is filled so that the mandrel tension type rivets cannot be touched from the outside.

(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, 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.

A base side lug 25 and a frame side lug 26 are welded to the base 21 and frame member 23, respectively. The glass cover 22 includes sealing devices 27, 28, 29, 3, which will be described later, which connect the base side lug 25 and the frame side lug 26 via the frame member 23.
0, it is joined to the base 21 and the internal display device etc. are sealed.

FIG. 1A is a sectional view showing an embodiment of the present invention used in the example shown in FIGS. 2A and 2B, and shows a state in which a mandrel tension type rivet is inserted. Further, FIG. 1B is a sectional view showing the state of the embodiment shown in FIG. 1A after being sealed.

Sealing devices 27 to 30 in Fig. 2 A and B
have the same structure, and the first
In Figures A and B, the sealing device 27 will be described.

The sealing device 27 includes a mandrel tension type rivet 31,
It is composed of a base side washer member 32 and a frame side washer member 33.

The mandrel tension type rivet 31 is composed of a rivet member 34 and a mandrel 35, and the rivet member 34 has a hollow insertion hole 36 formed along its axis and a first head 37 at one end. provided. A residual head 38 having an outer diameter slightly larger than the inner diameter of the insertion hole 36 is provided at the rear end of the mandrel 35 inserted into the insertion hole 36, and the residual head 38 and the mandrel 35 are connected to each other. A breaking portion 40 is formed in between, which is broken by pulling the mandrel 35 in the direction of the arrow 39 with a predetermined tensile force.

The base side washer member 32 and the frame side washer member 33 are respectively formed with flat bottom portions 41, 42 and peripheral portions 43, 44 surrounding the mandrel tension type rivet 31. The joint portion 45 between the bottom portions 41 and 42 and the base side lug 25 (FIG. 2) and the frame side lug 2
The rivet member 3 is attached to the joint 46 of 6 (Fig. 2).
Through-holes 47, 48, 49, and 50 are provided, respectively.

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

As shown in FIG. 1A, the base side washer member 32
and the frame side washer part 33 are joined by sandwiching the joint parts 45 and 46, through the through holes 47 to 50,
In the opposite direction to the arrow 39, the mandrel tension type rivet 3
1 is inserted through the bottom part 42 of the frame side washer member 33.
is pressed against the joint portion 46 by the first head 37 .

As described above, the first head 37 is attached to the frame side washer member 3.
3 and pressed against the joint parts 45 and 46,
When the residual head 38 of the mandrel tension type rivet 31 is pushed in the direction of the arrow 39, the residual head 38
While expanding the insertion hole 36 of the rivet member 34 outward, it is moved toward the bottom surface portion 41 of the base side washer member 32, and the portion pressed and expanded as described above and the remaining head 38 cause the base A second head 51 is formed that presses the side washer member 32 against the joint portion 45. Then, the remaining head 38 that has been pushed in is caulked with the rivet member 34 so that it does not fall off.

Next, when a predetermined tensile force is applied to the mandrel 35 in the direction of the arrow 39, the breaking portion 40 is broken and the residual head 38 is left in the position shown in FIG. 1B in the insertion hole 36. , the mandrel 35 is separated.

Then, when the resins 53 and 52 used as sealing members are filled inside the base-side washer member 32 and the frame-side washer member 33, the sealing operation is completed.

(Modified example) In Fig. 1B, resin 4 is used as the sealing member.
Although 8,49 was used, other sealing materials such as lead can also be used. Also, the sealing device 27
30 are not limited to the electricity meter 20, but can also be used for gas meters, water meters, etc. The number of sealing devices provided in one meter is not limited to four, and may be one or five, for example.

(Effects of the invention) As explained above, according to the invention, by separating the base side lug and the frame side lug using a mandrel tension type rivet, both heads of the mandrel tension type rivet can be separated. The head of each of the mandrel tension type rivets is covered on the inside of each of the washer members joined together with the surrounding base side washer member and frame side washer member, and joined by the mandrel separation of the mandrel tension type rivet. Since it is filled with a sealing material that
It is possible to provide a meter sealing device that cannot be easily removed from the meter.

[Brief explanation of drawings]

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... Base side lug, 26... Frame side lug, 27-30... Sealing device, 31... Mandrel tension type rivet, 32...
Base side washer member, 33...Frame side washer member, 34
... Rivet member, 35 ... Core shaft, 36 ... Insertion hole, 37 ... First head, 38 ... Residual head, 39
. . . Arrow, 40 . . . Broken portion, 41, 42 .

Claims (1)

[Scope of utility model registration request] a base side lug provided on the outer side of the base;
In a meter sealing device comprising a frame side lug provided on the frame member of the cover at a position facing the base side lug, the base side lug and the frame side lug are separated on their axes using an axle tension type rivet. Accordingly, both heads of the mandrel tension type rivet are joined together with the base side washer member and the frame side washer member surrounding each, and the inner side of each of the washer members joined by the mandrel separation of the mandrel tension type rivet is placed. A meter sealing device characterized in that a sealing member is filled to cover each head of a mandrel tension type rivet.