JPH0713363Y2 - Three-phase batch opening / closing operation tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a three-phase batch opening / closing operation tool useful for opening / closing a movable rod constituting a low-voltage branching device in three-phase batch operation.

[Technical Background of the Invention and its Problems] FIG. 3A is a front view of a conventional three-phase low-voltage branching device, and FIG. 3B.
Is a side view thereof, and FIG. 3C is a connection diagram showing a connected state. As shown in FIGS. 3A and 3B, in the conventional device, two trunk circuits 1 are connected to the center of the device from the top in the u phase, v
Phase, w phase, N phase are provided in the order of steps, and 2 to 4 connecting branch circuits 2 are provided on each side of the main circuit 1.
Are provided in the order of u-phase, v-phase, w-phase, and N-phase from the top as in the above. Corresponding phases of the main circuit 1 and the connecting branch circuits 2 are fixedly connected by connecting buses 2u, 2v, 2w. Thus, the terminal of the trunk cable (not shown) of the trunk circuit 1 in each phase (excluding the N phase that does not require attachment / detachment) is connected to the terminal of the branch cable (not shown) of each communication branch circuit 2 in the trunk line unit. A branch unit is attached to each of the. Although they are also shown in FIG. 3A, the reference numerals are omitted in order to avoid complication of the drawing, and branching units 1u ₁ and 1v attached to the cable of the main circuit 1 are shown in FIG. 3B. Shown as ₁ , 1w ₁ . Reference numeral 4 in each of the drawings indicates a branching device housing. FIG. 3C is a connection connection diagram for the conventional low-voltage branching devices u, v, w phases, in which the plug-in units of each connecting branch circuit are shown as 2u ₁ , 2v ₁ , 2w ₁ .

The branch cables connected to the branch units 2u ₁ , 2v ₁ and 2w ₁ are connected via the fuses 6 in the fuse cylinders 5 integrated with the respective branch units, as shown in FIG. There is.

When the fuse needs to be replaced, the pulling out work must be performed manually as shown in FIGS. That is, as shown in FIG. 4A, when the pull-out prevention metal fitting 7 is provided, first remove it, and then use the pull-out tool 8 as shown in FIG. Pull out the plug-in unit 2u ₁ as shown in C, and shift the fuse barrel 5 and the waterproof cap 9 for sealing it to the branch cable 10 side as shown in FIG.
The connection between the branch cable 10 and the fuse 6 is cut off, and the connection between the fuse 6 and the branch unit 2u ₁ is cut off. Next, a new fuse is connected in the reverse order, the fuse cylinder 5 and the waterproof cap 9 are returned to the old positions, and the fuse replacement is completed.

However, in the above fuse replacement work, a phase loss may occur during the work, which may cause an accident depending on the equipment used on the customer side. Is desirable.

For this reason, low-voltage branching devices that can be opened and closed collectively in three phases have been developed. However, since all of them are of the type that incorporate a complicated opening / closing mechanism, they have a large number of parts and are also expensive. There were difficulties.

[Object of the Invention] The present invention has been made based on the above circumstances, and it is possible to easily open and close in three phases at once without a complicated opening / closing mechanism, and it is economically advantageous. It is intended to provide a phase batch opening / closing operation tool.

[Summary of the Invention] A three-phase collective opening / closing operation tool of the present invention has an operation handle having an upper end pivotally attached to an upper frame of a branching device housing, and a tip end arranged in a staircase shape inside the branching device housing. And a hooking means engaged with each pulling handle of the branch unit for three phases, and a connecting link pivotally attached to an intermediate portion of the operating handle and having a free end to which a base end portion of the hooking means is locked. It is characterized by having and.

[Embodiment of the Invention] Hereinafter, the present invention will be described with reference to the drawings of an embodiment. FIG. 1 is a side view of a three-phase batch opening / closing operation tool showing an embodiment of the present invention, and FIG. 2A is a side view of a clamp used when attaching the operation handle of the present invention to a housing 4, FIG. B is the front view, FIG. 2 C ₁ is the side view of the first operating plate, and FIG. 2 D ₁
Is the front view, FIG. 2 C ₂ is the side view of the second actuating plate,
Figure D ₂ is its front view, Figure 2E is a plan view of the operating handle,
2F is a side view thereof, FIG. 2G is a plan view of a connecting link connecting the operation handle and the operating plate, and FIG. 2H is a side view thereof.

In FIG. 1, reference numeral 22 ₁ denotes a base end portion of the first actuation plate 21, and other side edge portions 21 a have branch units u ₁ , v ₁ , w as shown in FIG. 2 C ₁ . _{It has} a stepped shape corresponding to the stepped arrangement of ₁ . Thus, the side edge portion 21a is shown in FIG.
_As shown in FIG. ₁ , a flat plate 23a fixed to a portion corresponding to the tread in each step of the stepped shape, and a flat portion 23a hanging from a portion corresponding to the tip of the tread and attached to a bundled portion 31a of a movable rod 31 described below at the lower end There is provided an inverted L-shaped small actuating plate 23 including a hooking plate 23c having an inverted U-shaped notch 23b to be fitted thereto.

Furthermore, on one side of the first actuating plate 21, as shown in FIG. 2 C _2, a second actuating plate of substantially the same shape as the first actuating plate
21 ₂ is provided in parallel with the first operating plate, and a reinforcing plate 22 ₂ similar to the above is provided at one side edge thereof. The second
Actuating plate 21 ₂ is located on the rear of the first operating plate 21, because it is hidden, not shown in Figure 1. 2nd actuation plate 21 ₂
In the same manner as the above, the side edge that is stepped has a first operating plate.
There is provided a small operating plate 23 ₂ having a U-shaped notch 23 b ₂ facing each small operating plate 23 _{1 of} 21 ₁ .

In FIGS. 1 and 2A and 2B, reference numeral 25 indicates a clamp for attaching the upper end of the operation handle 24 to the housing 4 via the connecting plate 26.
The upper frame of the opening and two leg pieces facing each other at an interval approximately equal to the distance between the inner surfaces of the engagement frame 27 provided in the housing 4 are formed in a substantially U shape, and one of the leg pieces is A position where the tightening bolt 25a is screwed and faces the bolt on the inner surface of the other leg piece,
Engaging frame 27 on the inner surface of the U-shaped bottom and the inner surface of the one leg piece
A cushion 25b is attached to each of the portions abutted with.

Further, when the operation handle 24 is in the vertical position, the positions facing the pins 28 provided at the center of the base end portions 22 ₁ and 22 ₂ of the operation plate of the operation handle 24 are shown in FIGS. One end of the connecting link 29 shown is pivotally attached. This end portion is provided with an engaging portion 29a narrower than an engaging portion 29b pivotally attached to the operation handle 24 in order to engage the _two reinforcing plates 22 ₁ and 22 ₂ . Reference numeral 30 indicates a pivot pin that pivotally connects the operation handle 24 and the connection link 29. Further, the connecting link 29 has an inverted U-shaped notch which engages with the pin 28 from above at its free end.
It has a 29c.

The three-phase batch opening / closing operation tool having such a configuration is used as follows.

First, the first and second actuating plates 21 ₁ and 21 ₂ are inserted into the housing 4, and each small actuating plate 23 ₁ of the first actuating plate 21 ₁ is attached to the pulling handle 31 of each branch unit. It is located above 31a. here,
An inverted U-shaped cutout 23b of the respective small actuation plates 23 ₁ to engage with the Batch portion 31a. Then, the small actuating plate 23 ₂ of the second actuating plate 21 ₂ is pushed up, and the constricted portion 31a is sandwiched between the small actuating plates 23 ₁ and 23 _{2 so} that each actuating plate
21 ₁ and 21 ₂ are fixed to the pulling handle 31 of each branch unit, and the base end portions 22 ₁ and 2 of the _first and second actuating plates 21 ₁ and 21 ₂ are fixed.
Fasten between 2 and ₂ with bolt V.

Next, the clamp 25 at the tip of the operation handle 24 is fixed to the upper frame of the housing 4. Here, the first, engaging the notches 29C of the second actuating plate 21 _1, 21 ₂ of the base end portion of the connecting link 29 which is pivotally mounted on the pin 28 and the operating handle 24 provided at the center.

Next, the operation handle 24 is pulled toward the outside of the housing as indicated by arrow B in FIG. Then, the operating plates 21 ₁ and 21 ₂ , and thus the small operating plates 23, are pulled toward the outside of the housing 4, and the branch units 1u ₁ , 1v ₁ and 1w ₁ of each phase are collectively pulled out. Becomes In the case of performing the three-phase collective connection, in the above state, the operation handle 24 may be pushed toward the inside of the housing 4 as indicated by arrow A in FIG.

In order to prevent an inter-phase short circuit through the operating plates 21 ₁ and 21 ₂ and an electric shock of a worker through the operating handle 24 and the connecting link 29, the operating plates 21 ₁ and 21 ₂ are made of an insulating material. It is desirable to do. If there is a problem in terms of mechanical strength if the operating plates 21 ₁ and 21 ₂ are made of an insulating material, the small operating plates 23 ₁ and 23 ₂ may be made of an insulating material. It may be made. Further, when the constricting portion 31a of the pulling handle 31 is made of an insulating material, the entire three-phase collective opening / closing operation tool of the present invention may be made of a metal material having high mechanical strength.

[Effects of the Invention] As is apparent from the above, the three-phase batch opening / closing operation tool of the present invention can open and close all three phases at once, so that it is possible to manually replace a fuse in a conventional low-voltage branching device. There is no risk of causing the observed phase loss.

Moreover, since the three-phase batch opening / closing operation tool of the present invention is not built in the branching device housing, one three-phase batch opening / closing operation tool is transported and used at various sites.
The branching device itself has almost the same structure as that of the conventional one, and there is no fear that the cost will be high because the branching device is opened and closed collectively.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a three-phase collective opening / closing operation tool of the present invention, FIG. 2A is a side view of a clamp attached to a housing 4, and FIG. 2B is a front view thereof. Figure C ₁ is the first
2D ₁ is a front view, FIG. 2C ₂ is a side view of the second operating plate, FIG. 2D ₂ is a front view of the operating plate, and FIG. FIG. 2F is a side view, FIG. 2F is a side view, FIG. 2G is a plan view of a connecting link that connects an operating handle and an operating plate, FIG. 2H is a side view thereof, and FIG. FIG. 3B is a front view showing the overall configuration of the device, FIG. 3B is a side view of the main part thereof, FIG. 3C is its connection diagram, and FIGS. 4A to 4D are drawing procedures in the conventional low-pressure branching device. FIG. 1 …… Main circuit 1u ₁ , 1v ₁ , 1w ₁ …… Branching unit 4 …… Case 10 …… Branching cable 21 ₁ , 21 ₂ …… Operating plate 24 …… Operating handle 26 …… Coupling plate 29 …… Coupling Link 31 …… Movable rod 31a …… Bundling section

Claims (1)

[Scope of utility model registration request] 1. An operation handle having an upper end pivotally attached to an upper frame of a branching device housing, and a tip end for pulling out a three-phase branching unit arranged in a stepped manner in the branching device housing. A three-phase package having hooking means engaged with a handle and a connecting link pivotally attached to an intermediate portion of the operation handle and having a free end of which a base end of the hooking means is locked. Opening and closing operation tool.