JPS6051226B2 - circuit break - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit that detects overcurrent and disconnects the circuit.

In this type of circuit, for example, an electromagnetic device is connected in series with the opening/closing contact mechanism, and when an overcurrent is applied, this electromagnetic device attracts an armature placed opposite to it, and the movement of this armature causes the latch to be activated. When the latch is rotated, a link-based drive mechanism is operated in conjunction with this latch, and the opening/closing contact mechanism is instantaneously opened.

By the way, in such a circuit, if an impact is applied to the body in the same direction as the direction in which the armature is attracted to the electromagnetic device, the armature will try to move in the same way as when it was attracted to the electromagnetic device. do.

This impact is also applied to the latch, but its direction is the same as the direction of rotation to open the opening/closing contact mechanism.
This is assisted by the force that causes the armature to move, and it finally rotates in the same direction as when the overcurrent is applied.
This may cause the opening/closing contact mechanism to open. An object of the present invention is to solve the above-mentioned problems and provide a circuit and a device that can effectively prevent malfunctions caused by vibrations. The present invention includes a frame 41 and a handle 43 rotatably supported on the frame 41 by a support shaft 42.
, a first link 46 whose negative end side is rotatably connected to this handle 43 by a connecting shaft 45 , and this first link 4
a second link 48 whose one end is rotatably connected to the other end of the second link 48 by a connecting shaft 47; and a movable contact whose one end is rotatably connected to the other end of the second link 48 by a connecting shaft 49. A base 16, a fixed contact 5 provided opposite to the movable contact base 16, and a first contact rotatably supported by a support shaft 51 on the frame 41.
an engaging body 52 having a guide surface 53 that abuts the connecting shaft 47 between the link 46 and the second link 48;
1 includes a latch 56 that is rotatably supported by a support shaft 55 and engages and disengages from the engaging body 52, and a support shaft 3 that is engaged with the latch 56.
An armature 31 is rotatably supported at 0, a pressing piece 32 is spaced apart from the armature 31, and the armature 31 is disposed facing the armature 31. When an overcurrent is applied, the armature 31 is attracted and the latch 56 is closed. In a circuit breaker equipped with a rotating electromagnetic device 34, the latch 56 has an engaging portion 57 that removably engages with the engaging body 52, and has an arm extending from the top to one side. 58 is extended, and an actuating portion 59 inserted between the armature 31 and its pressing piece 32 is provided at the tip of this arm 58, and the arm 58 is extended in the opposite direction to the extending direction of the arm 58 with the pivot point in between. An extending balance weight 60 is provided.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, reference numeral 1 denotes a rectangular base made of insulating synthetic resin, and a power supply terminal 2 is attached to one end of the base 1.
is fixed, and a terminal screw 3 is screwed into this power supply side terminal 2.

A fixed contact plate 4 is integrally provided inside the power supply side terminal 2, and a fixed contact 5 is provided on the top surface of the tip of the fixed contact plate 4.
3. is installed. Further, a load-side terminal 6 is fixed to the other end of the base 1, and a terminal screw 7 is screwed into the load-side terminal 6.

A first frame 11 integrally formed of a magnetic metal material is fixed to the base 1 between the power supply side terminal 2 and the load side terminal 641, and a support shaft 15 is attached to one side of the first frame 11. The base end of the movable contact base 16 is rotatably supported by the movable contact base 16, and a movable contact 18 facing the fixed contact 5 is attached to the lower surface of the distal end of the movable contact base 16.

Further, a spring (not shown) is interposed between the movable contact base 16 and the first frame 11, so that the movable contact base 716 is always directed upwardly so that the movable contact 18 is separated from the fixed contact 5. It is energized, and an opening/closing contact mechanism 20 is configured. A substantially L-shaped magnetic guide portion 21 is formed on the other side of the first frame 11, and this magnetic guide portion 219
An oil case 22 made of a non-magnetic material and containing oil is erected from the bottom of the oil case 22, and a plunger 23 made of a magnetic material is inserted into the oil case 22 so as to be movable up and down. A ball 24 made of material is attached, and the plunger 23 and the ball 24
A coil spring 25 is interposed between the two.

An electromagnetic coil 2 is attached to the outer periphery of the oil case 22.
6 is installed. Although one end lead portion of this electromagnetic coil 26 is not shown, it is connected to the base of the movable contact base 16 by soldering, spot welding, etc.
Although the lead portion at the other end of the electromagnetic coil 26 is not shown, it is connected to the load side terminal 6 by soldering, spot welding, etc., thereby forming an electromagnetic device 34. Further, a bearing piece 29 is formed on the upper part of the magnetic guide part 21 of the first frame 11, and an armature 31 is rotatably supported on the bearing piece 29 by a support shaft 30 with respect to the ball 24. Pressing pieces 32 are spaced apart from the base of the armature 31 on the armature 31, and the armature 31
is always urged upward by a spring (not shown).

Furthermore, an operating device 40 is provided on the base 1.

This operating device 40 includes a second frame 41 which is approximately U-shaped in plan view and is adjacent to the first frame 11 and is shown in FIG.
is fixed, and a support shaft 42 is attached to the upper part of this second frame 41.
A handle 43 is rotatably supported on the shaft.
Reference numeral 3 is a spring (not shown) that is constantly biased 4) in the clockwise direction in FIG. One end of the first link 46 rotates around the connecting shaft 45 at the lower end of the base of the handle 43.]
One end of the second link 48 is rotated by the connecting shaft 47 on the other end of the first link 46, and the other end of the second link 48 is connected with the connecting shaft 49. The middle portion of the movable contact base 16 is rotatably connected to form a drive mechanism. A triangular hole 44 is provided in the middle of the second frame 41 as shown in FIG.
The first link 46 and the second link 48 are connected within. A connecting shaft 47 is inserted, and serves as a guide during operation, which will be described later. Further, the base of an engaging body 52, which is substantially U-shaped in plan view, is rotatably supported by a support shaft 51 at the lower part of the second frame 41, and the base of the engaging body 52 is rotatably supported as shown in FIG. A convex arc-shaped guide surface 53 is formed so as to come into contact with the connecting shaft 47 between the first link 46 and the second link 48 .

Further, the base of a latch 56 integrally formed of synthetic resin is rotatably supported by a support shaft 55 above the engaging body 52 of the second frame 41, and the engaging body 52 is attached to the base of the latch 56. An engaging part 5 that removably engages with the middle upper part of the
7 is formed, and an arm 58 extends from the top of the latch 56 to one side (right side in the figure).
An actuating portion 59 is provided between the tips of the armature 8 and the actuating portion 59 is inserted between the armature 31 and the pressing piece 32 thereof.

Further, the arm 58
A balance weight 60 for the arm 58 extends in a direction opposite to the direction in which the arm 58 extends. And the above handle 4
3, the connection shaft 45 between the handle 43 and the first link 46, the connection shaft 47 between the first link 46 and the second link 48, and the connection between the second link 48 and the movable contact base 16. The shaft 49 is set so as to be at a position very close to the dead point at which the movable contact 18 maintains the on state when it contacts the fixed contact 5, that is, at a substantially linear position.

In this case, in a complete debug point, the first link 46
Since the connecting shaft 47 between the first link 48 and the second link 48 does not rotate, the connecting shaft 47 is supported in contact with the guide surface 53 of the distal end edge of the engaging body 52 at an angle as large as possible to escape from the first link. The link 46 and the second link 48 are prevented from rotating in a bent manner. Further, the support shaft 51 of the engaging body 52 is also set at a position close to the dead point with respect to the direction of the above-mentioned force. Next, the operation will be explained.

First, when turning on, the handle 43 is rotated counterclockwise in FIG. 1.

This rotation of the handle 43 pushes down the first link 46 via the connecting shaft 45, and further moves the connecting shaft 47 downward along the guide surface 53 of the engaging body 52 to push down the second link 48. , the movable contact base 16 is pushed down against the elasticity of the spring, and the movable contact 18 is brought into contact with the fixed contact 5 of the fixed contact plate 4, turning on the circuit as shown in FIG. Then, the on state is maintained with the connecting shaft 47 exceeding the reversal point. In this state, when an overcurrent flows through the electromagnetic coil 26, due to the relationship between the upward electromagnetic force received by the plunger 23 in the oil case 22 and the spring 25, the plunger 23 does not move at 100% current of the rated value, but 125 % current, it is pulled up toward the ball 24 with time retention due to the viscosity of the oil, and a magnetic circuit is formed by the ball 24, the plunger 23, the magnetic guide part 21 of the first frame 11, and the armature 31, and the armature 3
1 increases, and the armature 31 is attracted. When the armature 31 is attracted and rotated downward, the pressing piece 32 pushes the actuating portion 59 of the latch 56 downward, thereby causing the latch 56 to rotate clockwise in FIG. The engaging portion 557 is disengaged from the engaging body 52, the abutment gate support of the engaging body 52 on the connecting shaft 47 is released, and the first link 46 and the second link 48 rotate in a bent manner. Therefore, the movable contact base 16 is pushed up by the restoring force of the spring, and the movable contact 18 is separated from the fixed contact 5 to turn off the circuit. In this state, the handle 43 is rotated clockwise in FIG. 1 by the spring, and the first link 4
6, the second link 48 rotates while being pulled up, and the connecting shaft 47 moves to the guide surface 53 of the engaging body 52, returning to the OFF state.

5 Also, in the ON state of the circuit, by rotating the handle 43 in the opposite direction, the first link 46
Then, by rotating the second link 48, the movable contact base 16 can be released from being pressed down and returned to the OFF state.

O Here, as shown in the arrow in FIG. 4, the armature 31 is connected to the electromagnetic device
If an impact force is applied in the same direction as the direction in which it is attracted, the armature 31 will tend to move in the same way as if it were attracted by the electromagnetic device 34.

Further, the impact acts on the latch 56 as a force that tends to rotate it clockwise in the drawing, and this tendency is further strengthened by the force that tends to move the armature 31. However, the latch 56 has armature 3.
Since the balance weight 60 is provided to extend in the opposite direction to the engaging portion 59 with respect to the contact mechanism 1, the opening/closing contact mechanism 20 is prevented from rotating in the direction in which it is opened and closed, that is, in the clockwise direction described above.
Therefore, compared to the case where the latch 56 does not include the balance weight 60, malfunctions due to vibration can be more effectively prevented. As described above, according to the present invention, by extending the balance weight in the direction opposite to the operating portion of the armature of the latch that opens the opening/closing contact mechanism, an impact is applied to the latch in the same direction as the operating direction. Malfunctions caused by this impact can be effectively prevented and stable performance can be achieved, and the structure can be simple and inexpensive by simply extending a balance weight to the latch.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of a circuit breaker according to the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, FIG. 3 is an exploded perspective view of the main part, and FIG. FIG. 4 is an external view showing the direction of impact applied to the circuit and disconnector. 5... Fixed contact, 16... Movable contact stand, 30... Support shaft, 31... Armature, 32... Pressing piece. 34... Electromagnetic device, 41... Frame, 42... Support shaft, 43
...Handle, 45...Connection shaft, 46
...First link, 47...Connection shaft,
48... Second link, 49... Connection shaft, 51... Support shaft, 52... Engaging body, 5
3... Guide surface, 55... Support shaft, 56...
・Latch, 57...Engagement part, 58...
Arm, 59... Actuation part, 60... Balance weight.

Claims (1)

[Scope of Claims] 1. A frame, a handle rotatably supported on the frame by a support shaft, a first link rotatably connected at one end to the handle by a connecting shaft, and the first link. a second link whose one end is rotatably connected to the other end of the first link by a connecting shaft; and a movable contact base which is rotatably connected to the other end of the second link by a connecting shaft. , an engaging body having a fixed contact provided opposite to the movable contact base, and a guide surface rotatably supported on the frame by a support shaft and abutting on a connecting shaft between the first link and the second link. a latch that is rotatably supported on the frame by a support shaft and engages and disengages from the engaging body; an armature that is engaged with the latch and rotatably supported by the support shaft; and a spaced pair on the armature. and an electromagnetic device that is arranged opposite to the armature and rotates the latch by absorbing the armature when an overcurrent is applied, the latch is connected to the latch. It has an engaging part that removably engages with the combination, and an arm extending from the top to one side, and an actuating part inserted between the armature and its pressing piece at the tip of the arm, 1. A circuit and disconnector characterized in that a balance weight is provided that extends in a direction opposite to the extending direction of the arm with the pivot point in between.