JPH041578Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field: The present invention relates to improvements in sealing devices for electrical meters and other appliances.

Prior art and problems: Instead of the conventional sealing means using lead pieces, the sealing device for meters such as electric energy totalizers is
Various types of sealing tools have been developed that are fitted onto the heads of sealing screws so that they cannot be opened without destroying the sealing screws.

Among them, the inventor of the present invention claimed that it was the first patented invention in 1973.
As disclosed in No. 42697, the leaf spring ring with a locking claw constituting the sealing device is housed inside the housing, and can be handled as a single unit without fear of losing the parts. Furthermore, after sealing, a built-in leaf spring ring with claws can be engaged with the sealing screw head to achieve the intended purpose. In addition, Jikko 57
As disclosed in No. 5642, the synthetic resin sleeve has a locking step on the inner circumferential surface and is open at the bottom, and the upper half can be freely expanded and contracted by cutting grooves. The locking part is provided in such a manner that the lower half has a notch part for receiving the head of the sealing machine screw, and the small hole of the head of the sealing machine screw is inserted at right angles to the notch part. By combining the locking piece with a protruding pin that can be inserted into the sealing device, a sealing tool that can be sealed by inserting the pin into the hole in the head of the sealing machine screw and pushing down the sleeve was also obtained.

However, in the former case, the locking pawl of the leaf spring ring that locks the head of the small sealing screw for sealing after the seal is broken sticks to the screw head and does not come off easily. This was inconvenient for subsequent handling. In the latter case, if there is a large gap between the sealing screw and the adjacent protruding wall (for example, the side surface of the instrument panel cover) after the sealing device is installed, There is a risk that the sealing screw may be loosened by rotating the sleeve of the sealing tool, and the seal may be broken. This will not give you a complete sealing effect.

Purpose of the invention: The object of the invention is to solve these problems and provide an improved sealing device that has a simple structure and works effectively.

Structure of the invention: The upper half of the invention has a locking part that engages with the locking step structure inside the housing to make it impossible to remove it, and the lower half has a small screw head for sealing. a locking piece formed with a notch for receiving the screw, and a locking piece having a protruding pin that can be inserted into the small hole of the head of the small sealing screw laterally toward the notch; In the sealing tool, the locking piece includes a notch for receiving the head of a sealing machine screw, and a sleeve that is fitted and sealed by engaging the locking part and the locking step structure. in the opposite position,
A protrusion of an appropriate size is integrally provided, the housing is made of synthetic resin, and a protrusion capable of receiving the protrusion of the locking piece is formed protrudingly at the base, and the top and bottom are open at opposite positions of the base. Then, a thin anti-rotation protrusion was formed protrudingly.

The structure of the upper half of the locking piece in the present invention is a cylindrical shape with a locking step at the tip and middle part, and a plate spring ring with a locking pawl on the sleeve. is installed in an immovable receiver between the sleeve and the lower end of the cap that fits into it, and the locking pawl is engaged with the locking step at the tip of the locking piece before use, and when sealing. The locking pawl engages with the locking stepped portion at the intermediate portion so that it cannot be removed.

Another locking piece has cut grooves cut into the upper half so that it can be expanded and contracted freely, and the locking step at the tip engages with the step in the middle of the case before sealing. After sealing, the locking step provided at the intermediate portion of the locking piece is configured to engage with the locking step of the housing.

Embodiments and Functions: The sealing device of the present invention will be described in detail below with reference to embodiment drawings.The one shown in FIGS. 1 to 3 is the most preferred configuration, and the housing 1 made of hard synthetic resin , a relatively thin cylindrical main body 2, a cap 6 that is fitted from above to close the main body 2, and a cap 6 that is fitted from above to close the main body 2.
It consists of rotation stopping parts 3 and 4 that protrude symmetrically on both sides in the lower half, and a locking stage 5 is provided inside the intermediate position of the main body 2, and this locking stage 5 and the lower end of the cap 6 are connected to each other. Therefore, a leaf spring ring 8 having a plurality of locking claws 8' protruding inwardly is sandwiched between its periphery and provided inside. Note that one of the rotation stoppers 3 has a structure that communicates with the inside of the main body 2 and has an open bottom surface, and the other rotation stopper 4 is insulated from the inside of the main body 2 and is formed in the shape of a rectangular tube that is open in the vertical direction. has been done.

A locking piece 1 that fits into such a sleeve 1
0 has a cylindrical upper half 11 and has two locking steps 12' and 13' on the outer periphery of the tip and is locked by locking fins 12 and 13 that are inclined toward the tip. A groove 14 is formed by the fins 12 and 13, and a locking step 15' is provided by protruding a locking fin 15 from the locking steps 12' and 13' at a position closer to the middle of the dimension as appropriate. has a diameter larger than that of the upper half 11, and a notch 17 is provided on one side from the center as shown in FIG. ) A pin 19 that engages with the hole 42 of the head 41 is implanted. A rotation preventing protrusion 18 is provided at a position opposite to this notch 17. This locking piece 10 is integrally molded from synthetic resin or easily molded metal.

The sleeve 1, the locking leaf spring ring 8, and the locking piece 10 configured in this way are such that when not in use, the locking pawl 8' of the leaf spring ring 8 locks. The pieces 10 are engaged with the grooves 14 at their ends and are assembled together in a state where they cannot be removed. When in use, the pin 19 is inserted into the small hole 42 of the head 41 so that the head 41 of the small sealing screw 40 is received in the notch 17 of the locking piece 10, and the pin 19 is inserted into the small hole 42 of the head 41. The opening part of the main body covers the head 41 of the sealing machine screw 40. If the sleeve 1 is pushed down as it is, the locking pawl 8' will be angled upward and fitted into the groove 14 of the locking piece 10, so it will be pushed against the elastic force by the locking fin 13 directly below it. The upper half 11 of the locking piece 10 deeply enters the inside of the housing 1, climbs over the locking fin 15 at the intermediate position, and engages the locking step 15' and the locking pawl 8'. When these are engaged, the sealing machine screw head 41 is confined within the housing 1 as shown in FIG. 3, and the protrusion 18 is also accommodated within the rotation stopper 3.
Since the rotation stoppers 3 and 4 of the housing 1 are unable to rotate due to contact with the case side wall A' of the instrument A (see Fig. 4), the sealing machine screw can no longer be used unless the sealing device is destroyed. 40 can no longer be rotated,
Demonstrates a sealing effect.

If the sealing tool is intentionally rotated after this sealing, either the rotation stopper part 3 or 4 of the housing 1 will come into contact with the case side wall A' of the instrument A, and the sealing machine screw 40 will be loosened. When the rotation stopper part 4, which is formed in a rectangular cylinder shape, has a weaker structure than the rotation stopper part 3 on the opposite side, when it is rotated by applying an excessive external force, this part breaks. Since it is in an irreversible state, even if you try to reseal it, it will no longer be possible. Therefore, the seal cannot be broken.

Next, configurations other than those described above can be adopted for the locking piece. An example of this is shown in FIGS. 5 and 6, in which the locking piece 20 is made of a synthetic resin having elasticity and appropriate hardness, such as polyethylene, and the upper half 21 is made into a truncated conical shape with a locking fin 23 of an appropriate thickness at the top, and a cylindrical groove with an appropriate width and a cylindrical shape in the middle. An annular groove 24 is carved with a depth such that the root diameter is smaller than the diameter of the insertion hole 9 formed by the locking step portion 5' (provided on the sleeve 1A), and a lower half portion 25 is continuous with the annular groove 24.
has a structure similar to that of the specific example described above. Identical parts are given the same reference numerals.

In the case of such a structure, the top end locking fin 23 of the locking piece 20 engages with the locking step 5' in the sleeve 1A as shown in FIG. 5 in an unused state. ,
It is assembled without coming off. And when sealing, by pushing down the mantle 1A,
The upper half 21 of the locking piece 20 is compressed by the cut groove 22, the locking step 5' engages with the annular groove 24, and the protrusion 18 fits inside the rotation stopper 3 to form a seal. (See Figure 7).

Effects of the invention: According to the invention, all the conventional problems are solved, the conventional sealing screw can be used as is, a reliable seal can be made with simple operation, and it can be modified once it has been sealed. It is impossible to do so, and even if you intentionally try to break the seal, it will be blocked, making it impossible to do anything illegal, and of course, if you apply too much force, it will be destroyed and cannot be restored.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an uncut locking piece of a specific example of the sealing device of the present invention before use, Fig. 2 is a bottom view of Fig. 1, and Fig. 3 shows how the sealing device is installed. FIG. 4 is a diagram showing a rotation prevention mode when installed, FIG. 5 is a vertical sectional view of another example, FIG. 6 is a view taken from the side shown in FIG. 5, and FIG. 7 is a diagram showing a mounting mode. 1, 1A... sleeve, 2... main body, 3, 4... rotation stopping part, 5, 5'... locking step part, 6... cap, 8... leaf spring ring, 8'... retainer Stopper, 10,2
0... Locking piece, 11, 21... Upper half, 12, 1
3, 15, 23...locking fin, 12', 13', 1
5'... Locking step, 14, 24... Annular groove, 16...
... lower half, 17 ... notch, 18 ... protrusion,
19...pin, 40...sealing machine screw, 41...
Machine screw head, 42...Small hole, A'...Case side wall.

Claims (1)

[Scope of utility model registration request] The upper half has a locking part that engages with the locking step structure inside the housing to make it impossible to remove, and the lower half has a notch to receive the head of a sealing machine screw. , and a locking piece having a protruding pin that can be inserted into the small hole of the head of the small sealing screw laterally toward the notch; A mantle that is sealed by engaging with a locking step structure;
In the sealing device, the locking piece is integrally provided with a protrusion of an appropriate size at a position opposite to the notch for receiving the head of the sealing machine screw, and the housing is made of hard synthetic resin. A seal characterized in that a protrusion capable of receiving the protrusion of the locking piece is formed on the base, and a rectangular rotation preventing protrusion that is insulated from the inside of the case and is open from the top and bottom is formed at a position opposite to the protrusion. Ingredients.