JPH04285413A - Mechanical interlock of switch - Google Patents

Abstract

PURPOSE:To facilitate the drawing out of upper and lower switches and lighten a rod, which couples upper and lower rotary shafts, so as to prevent deterioration of operation property. CONSTITUTION:The rod is halved up and down into a rod 3A and a rod 3B. A link plate 6 is provided freely in rocking at the center between the upper and lower rotary shafts 12A and 12B. The lower end of the upper rod 3A is linked with one end of the link plate 6, and the upper end of the lower rod 3B is linked with the other end of the link plate 6. At the top of the upper rod 3A and the bottom of the lower rod 3B are provided control levers 13A and 13B, which moves up and down by the rocking of operation shafts 12A and 12B, lock pins 4A and 4B, and rock arms 7A and 7B, which contact with and separate from the topsides of the lock pins 4A and 4B.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical interlock for a switch.

0003

[Prior Art] In FIG. 5, which shows a left side view of a high-pressure combination starter equipped with a conventional switch mechanical interlock (hereinafter referred to as "interlock"), the interior of a box 1 with a door 1a provided on the front surface is shown. A pull-out mechanism 2a is fixed to the upper part and a pull-out mechanism 2b is fixed to the lower part. Of these, a drawer-type switch (hereinafter referred to as a switch) 2A is mounted on the drawer mechanism 2a, and a switch 2B is mounted on the drawer mechanism 2b so as to be freely drawn out.

Next, the rotating parts 12A and 12B that open and close the main contacts of these switches 2A and 2B have operation levers 21A and 21B on the left end when viewed from the front.
In the same figure in which 2B is in an open state, the rotating shafts 12A and 12B are tilted by the operating angle and are each fixed. Among these, the upper end of a link 23 is connected to the tip of the operating lever 21A via a connecting pin 22A, and the lower end of this link 23 is connected to the tip of the operating lever 21A.
An oblong hole 23 in which a parallel portion is formed in the longitudinal direction of the link 23
A connecting pin 22B attached to the tip of the operating lever 21B is loosely attached to the upper end of the oblong hole 23a.

In the interlock configured as described above, when the rotating shaft 12B rotates in the direction of arrow B2 in the figure due to the closing operation of the lower switch 2B, the operating lever 21B becomes in a horizontal state as shown by the dotted line in the figure. Connecting pin 22B at the tip
moves to the lower end of the oblong hole 23a. Then, at this time,
Even if the close signal is input to the upper switch 2A, the link 23
cannot be moved upward, so the upper switch 2A cannot be closed.

On the other hand, the upper switch 2A closes first, and the rotating shaft 12A rotates in the direction of arrow B1, causing the operation lever 2 to rotate.
When the tip of the control lever 21B moves upward, the link 23 moves upward, and the lower end of the oblong hole 23a connects to the connecting pin 2 at the tip of the operating lever 21B.
Move to position 2B. At this time, even if a close signal is input to the lower switch 2B, the link 23 and the tip of the operating lever 21B cannot be moved downward, so the closing operation in the direction of arrow B2 cannot be performed. That is, the upper and lower switches 2A, 2
It is not possible to input B at the same time.

[0007]

[Problems to be Solved by the Invention] However, in the interlock configured in this way, for maintenance and inspection, the switches 2A and 2B cannot be pulled out to the inspection position.
When lowering the box 1 onto the installation surface, the link 23 must be removed. Then, for this work, switch 2
A space is required between A and 2B and the left outer wall of box 1 to put tools in and work, so the width of box 1 becomes wider, which not only increases the installation floor space but also reduces maintenance and inspection time. is also longer.

On the other hand, in the case of a combination starter in which current-limiting fuses, instrument transformers, etc. are attached to the switches 2A and 2B, the distance between the upper and lower switches 2A and 2B becomes longer, and the link 23 also becomes longer. As a result, the link 23 becomes thicker and heavier due to its rigidity, and the upper switch 2
When A performs the closing operation, the heavy link 23 may reduce the loading speed. Therefore, the purpose of the present invention is to
It is an object of the present invention to provide an interlock that allows easy maintenance and inspection of the switch and prevents deterioration of the operating characteristics of the switch. [Structure of the invention]

[0009]

[Means and Effects for Solving the Problems] The present invention provides a rod that is erected on one side of a switch that is housed vertically in a box and that is moved up and down by an operating lever that is fixed to the rotating shaft of the switch. In the mechanical interlock of the switch, the rod is composed of an upper rod and a lower rod, and a link is provided in the center between the rotation axes of the upper and lower switches, with both ends swinging up and down with the middle as the axis. The lower end of the rod is connected to one end of the link, the upper end of the lower rod is connected to the other end of the link, and the upper end of the upper rod and the lower part of the lower rod are connected to and separated from the top surface of the tip of the operating lever that swings up and down with the rotation of the rotating shaft. By providing an engaging part to reduce the weight of the rod, the switch can be pulled out from the box body independently of the mechanical interlock, making maintenance of the switch easier and maintaining the operating characteristics of the switch. This is a mechanical interlock for switches that can be used.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the switch interlock of the present invention will be described below with reference to the drawings. FIG. 1 is a left side view showing the interlock of the present invention attached to a box body, a view corresponding to FIG. 5, and FIG. 2 is a right side view of FIG. ), the upper and lower switches 2A
, 2B are now in the open connection position.

In FIGS. 1 and 2, the upper and lower drawer mechanisms 2
Fixing parts 2a0 and 2b0 are respectively erected at the rear portions of a and 2b, and main circuit disconnecting parts 2a1 and 2b1 are provided at intermediate front parts of these fixing parts 2a0 and 2b0. The rear ends of the conductors 2a2 and 2b2 connected to the parts 2a1 and 2b1 are connected to a main circuit conductor or a cable (not shown) inside the box.

On the other hand, on the inner surface of the left side plate 1b of the box body, a mounting plate 3 bent into an L-shape in cross section is vertically fixed with bolts. A support plate 9 bent into a convex shape is fixed vertically, and the left end of a stepped pin 5, whose details are omitted, is fixed to the center of the convex portion of the support plate 9.

Further, an L-shaped rod guide 8A0 is fixed to the upper part of the mounting plate 3.
A similarly L-shaped arm guide 8A1 is fixed to the lower surface of the arm guide 8A1. Of these, a guide hole (not shown) is provided at the right end of the rod guide 8A0, and serves as an engagement portion for the upper end of the rod 3A, which will be described later.

Similarly, an L-shaped rod guide 8B0 is fixed to the lower part of the mounting plate 3.
On the top surface of 0, there is also an L-shaped arm guide 8B1.
is fixed. Of these, a guide hole (not shown) is provided at the right end of the rod guide 8B0, and serves as an engaging portion for the lower end of the rod 3B, which will be described later.

Next, the center portion of a strip-shaped link plate 6 is fitted to the right end of the stepped pin 5, and the front and rear ends are attached with bolts so as to be able to swing up and down. The lower end of an L-shaped arm 11A is swingably connected to the front end, and the upper end of the L-shaped arm 11B is swingably connected to the rear end via a connecting pin 10.

Among these, the arm 11A and the rod guide 8
Between the right ends of A0, the upper part of a rod 3A with a thread formed at the lower end passes through the guide hole at the right end of the rod guide 8A0 and is installed vertically, and the lower end of this rod 3A is fixed to the arm 11A with a bolt 14. A substantially J-shaped lock arm 7A is welded to the upper part of the rod 3A at a position below the rod guide 8A0. Similarly, arm 11B
and the right end of the rod guide 8B0, a rod 3B having a thread formed at the upper end passes through it vertically, and the upper end is connected to the bolt 14.
is fixed to arm 11B, and approximately J is attached to the bottom of rod 3B.
A letter-shaped lock arm 7B is welded.

On the other hand, the rotation shaft 1 of the upper and lower switches 2A, 2B
At the left end of each of 2A and 12B, a flat part (details omitted) that becomes the chord of an arc is formed on the upper surface, and the lower surface of the front end of the square bar-shaped operation lever 13A, 13B comes into contact with this flat part, and the rotating shaft 1
Tightening rods 13a, 13b in contact with the lower surfaces of 2A, 12B
They are fixed by tightening the rotating shafts 12A and 12B with bolts inserted between them.

A through hole (not shown) passes through the rear end of these operating levers 13A, 13B laterally, and a stepped portion at the right end of the cylindrical lock pin 4A, 4B passes through this through hole. It is fixed with a bolt (not shown). Of these lock pins 4A, 4B, the left end upper surface of the lock pin 4A is now in contact with the lower surface of the lock arm 7A, and the left end upper surface of the lower lock pin 4B is spaced from the lower surface of the lock arm 7B by a predetermined gap. (Note: The gap where the switch 2B comes into contact lightly when it is turned on) is now facing each other.

Next, the operation of the interlock constructed as described above will be explained. 3(a) is an enlarged view of the movable part of the interlock 20 in FIG. 1, and FIG.
) (i.e., an enlarged view of the movable part in FIG. 2), FIG. 4 shows a state in which the interlock in the state shown in FIGS. 1 to 3 is activated by closing the upper switch 2A.

First, in FIG. 3, the lower lock pin 4B
As described above, the gap X between the bottom surface of the lock arm 7B and the lock arm 7B above the lock arm 7B is adjusted by the nut 14 to a gap where the switch 2B makes light contact when the switch 2B is turned on. Therefore, operating lever 1
3B, it is possible to rotate the rotating shaft 12B to the right in FIG. 3A, that is, to close the switch 2B.

Next, when a closing command is given to the upper switch 2A and the operating lever 13A and lock arm 7A rotate clockwise from FIG. , the rod 3B is driven downward, but
Since the operating lever 4B is swingable in the above-mentioned gap X, it can be operated as shown in FIG. 4, that is, it can be closed. Moreover, at that time, even if the lower switch 2B receives a closing command and starts the closing operation, the upper surface of the lock pin 4B is in contact with the lower surface of the lock arm 7B as shown in FIG. Can not. In other words, the upper and lower switches 2A
, 2B cannot be input at the same time.

Conversely, when the lower switch 2B is closed from the state shown in FIGS. 1 to 3, the gap X shown in FIG. 3 disappears, the rod 3B moves downward, the link plate 6 rotates counterclockwise, Since upward movement of rod 3A is impossible, lock pin 4A,
Rightward swinging of the operating lever 13A and the rotating shaft 12A, that is, closing of the switch 2A becomes impossible.

On the other hand, the length of the upper and lower rods 3A and 3B can be reduced to less than half that of the conventional link 23 shown in FIG. 5, and the cross-sectional dimension (diameter) can also be reduced to half. This allows the weight to be significantly reduced. therefore,
Since the load at the time of closing the switches 2A and 2B can be reduced, the initial closing characteristics can be maintained. Furthermore,
During maintenance and inspection, pull out the switches 2A and 2B from the pull-out mechanism 2a.
, 2b, the lock pins 4A, 4B can be removed forward from the lower surfaces of the lock arms 7A, 7B, so they can be easily pulled out with one touch.

[0024] Moreover, since the parts can be used in common for the upper and lower parts, manufacturing and assembly are also facilitated.

In the above embodiment, the upper and lower operating arms 13A, 13B, the lock pin 4A and the operating arm 1
3B and lock pin 4B are separate parts, but each is L
It may also be shaped into a single-piece operating arm. Similarly, the lock arms 7A, 7B at the upper and lower ends of the rods 3A, 3B may be omitted, and the upper and lower ends of the rods 3A, 3B may be bent into a single step shape.

[0026]

[Effects of the Invention] As described above, according to the present invention, a rod is installed upright on one side of a switch housed vertically in a box body and is moved up and down by an operating lever fixed to a rotating shaft of the switch. In a mechanical interlock for a switch, the rod is composed of an upper rod and a lower rod, and a link is provided in the center between the rotation axes of the upper and lower switches, with both ends swinging up and down with the middle as the axis. The lower end is connected to one end of the link, the upper end of the lower rod is connected to the other end of the link, and the upper part of the upper rod and the lower part of the lower rod are engaged with and separated from the top surface of the tip of the operating lever that swings up and down with the rotation of the rotating shaft. By providing a joint, the weight of the rod is reduced, and the switch can be pulled out from the box body regardless of the mechanical interlock, making maintenance of the switch easy and making it easier to maintain the operating characteristics of the switch. You can obtain a mechanical interlock for the switch.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating an embodiment of the mechanical interlock of the switch of the present invention, when the upper and lower switches are in an open state.

FIG. 2 is a right side view of FIG. 1 seen from the front of the box.

FIG. 3 is a diagram showing the effect of the mechanical interlock of the switch of the present invention, when the upper and lower switches are in an open state.

FIG. 4 is a diagram showing the effect of the mechanical interlock of the switch of the present invention, when the upper switch is closed and the lower drawer-type switch is open.

FIG. 5 is a diagram showing an example of a mechanical interlock of a conventional switch.

[Explanation of symbols]

1...Box body, 2A, 2B...Switch, 3A, 3B...Rod,
4A, 4B...Lock pin, 5...Fixing pin, 6...Link plate, 7A, 7B...Lock arm, 8A, 8B...Lock guide.

Claims (1)

[Claims] 1. In a mechanical interlock for a switch, which is provided with a rod that is vertically installed on one side of a switch that is housed vertically in a box body and that is moved up and down by an operating lever fixed to a rotating shaft of the switch. , the rod is composed of an upper rod and a lower rod, a link is provided in the center between the rotation axes of the upper and lower switches, both ends of which swing up and down with the middle as an axis, and the lower end of the upper rod is connected to the link. The upper end of the lower rod is connected to the other end of the link at one end, and the upper end of the operating lever, which swings up and down with rotation of the rotation shaft, is attached to the upper part of the upper rod and the lower part of the lower rod. A mechanical interlock for a switch characterized by having an engaging part that connects and separates.