JPS635141Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a safety lock device for a switch, and its purpose is to prevent the switch from being accidentally closed when the switch is opened for fuse replacement or inspection. To provide a safety lock device for a switch which can prevent the occurrence of power outages, ensure safety during power outage work, etc., have a simple structure, and can keep costs low.

An embodiment embodying the present invention will be described below with reference to FIGS.
are a pair of front and rear mounting frames provided between both fixed bases 1, both of which have an angular cross section. Reference numeral 3 denotes three supporting insulators erected on the horizontal portion 2a of the rear mounting frame 2, and a terminal block 4 for connecting lead wires is fixed to the upper end of each insulator. 5 is a fuse carrier 6 attached to a part of each terminal block 4.
It is a current-limiting fuse that is mounted on a shaft 7 so as to be rotatable from side to side via a fuse carrier 8, and a movable contact blade 9 is attached to the lower side of each tip via a fuse carrier 8.

Reference numeral 10 denotes three body insulators installed upright on the front mounting frame 2, each of which has a fixed electrode at its inner bottom for inserting the movable contact blade 9, and a lead wire connection at the upper end. The terminal block 11 is installed. 12 is an arc extinguishing chamber.

13 is an operating shaft provided below the horizontal portion 2a of the rear mounting frame 2, as shown in FIGS.
A push-up rod 14 is attached via a connecting rod C at a position corresponding to the current-limiting fuse 5 of each phase. The upper end of each push-up rod 14 is rotatably attached to a shaft 16 with respect to a support plate 15 below each current-limiting fuse 5 described above. 17 is each push-up bar 1 on the operating shaft 13;
Latch levers 18 are fixed at positions corresponding to 4 and 18 are coil springs hung between the tips of each latch lever 17 and the front mounting frame 2. The current-limiting fuse 5 is always biased to rotate in the opening direction.

Reference numeral 19 is a stopper provided on the upper front side of the locking lever 17, and is used to restrict the forward rotation of the lever 17 to a certain position.

Reference numeral 20 designates an engaging portion formed by sharpening the proximal end of each of the locking levers 17 into a triangular shape, as shown in FIG. 21 is attached to the lower surface of the horizontal portion 2a of the rear mounting frame 2 above any one of the locking levers 17 (in this example, the locking lever 17 located at the left end) as shown in FIGS. 5 to 7. It is a cylindrical lock pin, and is rotatably supported in the left-right direction by a mounting bolt 22 screwed into the base end of the lock pin from above through the horizontal portion 2a. The lock pin 21 is adhesively fixed to the mounting bolt 22 so that it can rotate integrally therewith. 23 is a nut screwed into the lower end of the mounting bolt 22, 24a, 24b
are a spring washer and a washer interposed between the horizontal portion 2a and the head 22a of the bolt 22 and between the horizontal portion 2a and the lock pin 21, respectively.
Note that the lock pin 21 is normally in a position completely removed to the right from the locking lever 17, as shown by the broken line in FIG.

Therefore, when the mounting bolt 22 is rotated counterclockwise, the lock pin 21 is also rotated counterclockwise.
In this state, the tip of the lock pin 21 can engage with the locking lever 17.

As shown in FIG. 7, 25a and 25b are a pair of large and small regulating protrusions that protrude downward on both left and right sides of the lock pin 21 in correspondence with the distal end of the lock pin 21, and both of them extend a part of the horizontal portion 2a downward. It is formed by punching out. The larger regulating protrusion 25a is raised to completely prevent the tip of the lock pin 21 from rotating further to the right in the state shown in Fig. 7, and the smaller protrusion 25b is raised to prevent the tip of the lock pin 21 from rotating any further to the right. The tip of the lock pin 21 is formed low in order to lightly restrict it from turning naturally to the left.

W1 and W2 are a lock confirmation window and a release confirmation window provided corresponding to the lock position and release position of the locking lever 17 by the lock pin 21, respectively, and both of them are provided in a circular shape on the horizontal part 2a of the mounting frame 2. It is transparent. Note that these windows W1,
Since the lock pin 21 is visible from above through W2, the pin 21 may be colored to make it easier to see.

As shown in FIGS. 1 and 4, 26 is a charging handle whose base end is fixed to one end of the operating shaft 13 so as to extend diagonally forward and upward, and has a hook portion 27 recessed on the dorsal side of its tip. . 28 is the same input handle 2
It is an open handle whose proximal end is tiltably mounted on a shaft 29 approximately in the center of the opening handle 6, and extends in approximately the same direction as the input handle 26. Incidentally, the shaft 29 projects inwardly as shown in FIG. 4, and an engagement roll 29a is mounted thereon. 30 is the open handle 28
It is a hook part recessed at the tip of the holder. 31 is a pressing projection provided on the ventral side of the proximal end of the open handle 28.

As shown in FIGS. 3 and 4, 32 is a locking member that is tiltably mounted on a shaft 33 at the front of the right fixed base 1, and its position is such that the shaft 29 of the opening handle 28 is aligned with the loading handle. This corresponds to the position lowered with 26. Note that the locking member 32 is always in a substantially vertical state. Reference numeral 34 denotes a diagonal portion formed on the rear side of the distal end of the locking member 32, and is capable of engaging with the engagement roll 29a inside the release handle 28. Numeral 35 is a pressing portion similarly formed on the rear side of the proximal end of the locking member 32, and is adapted to engage with the pressing protrusion 31 of the release handle 28. Reference numeral 36 denotes a locking recess provided on the rear side of the locking member 32 between the pressing portion 35 and the slanted portion 34, into which the engaging roll 29a can be inserted and fixed.

37 is a spring for biasing the locking member 32 to rotate rearward.

Next, the operation of the switch constructed as described above will be explained.

First, to explain the circuit closing operation, Fig. 1b
In the open state shown in FIG.
When the operating shaft 13 is rotated clockwise against the elasticity of the operating shaft 13, as shown in FIG.
At the same time, each connecting rod C and push-up rod 14 are simultaneously rotated clockwise. Therefore, the current limiting fuse 5 is rotated clockwise about the shaft 7 via the push-up rod 14, and the movable contact blade 9 at the tip thereof is also moved toward the fixed electrode. When the input handle 26 is turned clockwise, the engagement roll 29a on the shaft 29 first engages the locking member 3.
2, the locking member 32 is slightly tilted forward against the elasticity of the spring 37. Then, when the charging handle 26 is further turned clockwise and each movable contact blade 9 is completely inserted into the fixed electrode, the engaging roll 29a of the charging handle 26
corresponds to the locking recess 36 of the locking member 32. Therefore, the locking member 32 returns to the upright state due to the elasticity of the spring 37, and the engagement roll 29a of the input handle 26 is engaged in the locking recess 36. Therefore, the closing handle 26 is locked in the closed state of the switch.

Next, to explain the circuit opening operation, in order to open the circuit from the closed state shown in FIG.
Rotate 8 counterclockwise. When the release handle 28 is turned, the pressing protrusion 31 at the base end pushes the pressing portion 35 of the locking member 32 forward. Therefore, the locking member 32 is tilted forward against the spring 37, and the engagement roll 29a is released from the locking recess 36. At the same time, the release handle 28 and the input handle 26 are also moved by the elasticity of the coil spring 18. It begins to rotate counterclockwise. In addition, the input handle 26
Once released from the locked state, it is easily rotated to the left by the elasticity of the coil spring 18 at the base end.

In addition, at the time of such an open circuit, each latch lever 17
is rotated counterclockwise in FIG. 3, and its tip hits the stopper 19. At the same time, latch lever 1
The engaging portion 20 of No. 7 is approximately horizontal below the lock pin 21.

When the input handle 26 is turned to the left, the operating shaft 13, as shown in FIG.
Since each current limiting fuse 5 is moved via each connecting rod C and push-up rod 14, the movable contact blade 9 at the tip thereof
are removed from the fixed electrode all at once, and the switch becomes open-circuited.

Now, in order to lock this switch in the open state, as shown in FIG. 7, the head 22a of the mounting bolt 22 is strongly rotated counterclockwise using a screwdriver or the like. Then, together with the bolt 22, the lock pin 21 is also rotated counterclockwise as shown by the two-dot chain line, and its tip engages with the horizontal engaging portion 20 at the base end of the locking lever 17, and the lever 17 is Rotation in the clockwise direction becomes impossible. Note that when rotating the lock pin 21 in this way, the pin 21
The tip of the lock pin 21 engages with a small regulating protrusion 25b, but since this protrusion 25b is low and a spring washer 24a is interposed on the mounting bolt 22, when the bolt 22 is turned strongly, the locking pin 21 will engage with the regulating protrusion 25a. Easily cross over the tip to the left.

When the rotation of the latch lever 17 is restricted, the operating shaft 13 and the closing handle 26 fixed thereto also become unable to rotate clockwise, thereby reliably preventing the switch from being erroneously closed. .

Therefore, in such a locked state, the switch will never be turned on by mistake, allowing work such as fuse replacement and inspection to be carried out safely, and also ensuring safety during power outage work. I can do it.

In addition, at the time of such locking, the lock pin 21 corresponds to the window W1 for lock confirmation, so this window W
The lock status can be confirmed by looking at the lock pin 21 through the lock pin 21.

When releasing the lock state, use the mounting bolt 22.
Turn clockwise to position the tip of the lock pin 21 between the regulating protrusions 25a and 25b.

In the embodiment described above, when rotating the lock pin 21, the head 22a of the mounting bolt 22 is turned using a screwdriver or the like, but as shown in FIG.
8, the lock pin 21 can be easily turned by hand without using any tools. Furthermore, if a handle having a hook hole 39 as shown in FIG. 9 is used as the operating handle 38, the lock pin 21
It is also possible to operate it with a hook stick.
Furthermore, a pointer that can be rotated integrally with the mounting bolt 22 may be attached to a position that can be visually recognized from the outside, and in this way, the locked state and the unlocked state can be determined depending on the direction of this pointer. can be easily distinguished.

As detailed above, in this invention, the locking pin 21 is mechanically engaged and disengaged from the operating shaft that directly responds to the input handle in order to prevent its rotation, so the locking action is reliable. , the switch can be kept in the open state. Furthermore, since the operator can directly sense the locked state when operating the closing handle, the operator can easily know the operating state of the switch. It is possible to reliably prevent erroneous closing operations when replacing or inspecting fuses, and ensure safety during work.

The lock pin is prevented from rotating freely by a regulating protrusion provided on the mounting frame and is held in the unlocked state unless operated by the operator, so there is no possibility of any hindrance to opening/closing operations under normal conditions. Not only that, but the locked or released state of the locking pin can be directly read through the viewing window provided in the mounting frame corresponding to the state of the locking pin itself, making it easier to operate the locking pin. It is possible to provide accurate display to the person concerned.

In addition, regarding this locked state, the locking pin is provided in the space under the mounting frame, and the engaging part on the operating shaft side is also used as a part of the latching lever, thereby creating an extra protrusion on the surface of the switch. In addition, since it does not require any major changes to the external shape of the existing switch, there is no problem in making the switch using the present invention compact in consideration of operability or insulation, especially since it is installed inside the cubicle. Never. Furthermore, since the number of parts is small and the structure is simple, the cost can be kept low.

[Brief explanation of the drawing]

Fig. 1a is a front view showing a closed state of a switch equipped with a safety lock device embodying the present invention, b is a front view showing the same in an open state, Fig. 2 is a plan view of the switch, and Fig. 3 is a partially enlarged front view showing the closed state of the switch, FIG. 4 is a plan view, FIG. 5 is a partially front view showing the state of the safety lock when the switch is open, and FIG. 6 is a side view. , FIG. 7 is a plan view, FIG. 8 is a partial front view showing another example of the locking device, and FIG. 9 is a perspective view of the operating handle. 2...Mounting frame, 13...Operation axis, 17...
...Latching lever, 21...Lock pin.

Claims (1)

[Scope of utility model registration request] Operation shaft 13 that can rotate integrally with the input handle 26
A locking lever 17 is fixedly installed on the lower surface of the mounting frame 2 to lock one end of a coil spring 18 provided so as to always rotate and bias the operation shaft 13 in the opening direction. A lock pin 21 is rotatably supported, the tip of which moves approximately horizontally between a lock position where it engages with an engagement portion 20 provided at the base end of the lever and a release position where it does not engage. In the open state of the switch, the locking lever 17 can be locked unrotatably by the locking pin 21, and the mounting frame 2 is provided with the locking pin 2.
A window W for visual recognition of the lock pin 21 corresponding to the lock position and release position of the lock lever 17 by the lock pin 1
1, W2 is provided transparently, and the mounting frame 2
A safety lock device for a switch, characterized in that regulating protrusions 25a and 25b are provided on the lower surface to regulate the position of the lock pin 21 in the release position.