JPS634302B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to circuits and disconnectors.

[Background technology]

a handle rotatably supported; a link having one end connected to the handle and a movable shaft provided at the other end; a slit for guiding the movable shaft by operating the handle; A latch link that is connected and has a locking portion at the other end, a trip link that is biased to return so that the locking portion can be locked in the returned state, an abnormal current detecting means that trips the trip link, and an open trip link. a movable contact having a movable contact that is pole-biased; a fixed contact facing the movable contact; and a movable contact interposed between the movable contact and the intermediate portion of the latch link, and the opening force of the movable contact A circuit and disconnector is known (for example, Japanese Utility Model Publication No. 48-29973), which is provided with a movable body that presses a latch link so that the locking portion is locked with the trip link.

However, in this conventional example, in order to apply initial contact pressure to the movable contact, a spring for applying contact pressure is provided on the latch link, and the movable contact is biased in the closing direction. As a result, the following drawbacks arose. That is, (1) When the spring force of the spring for applying contact pressure is increased, the locking force for locking the latch link to the trip link becomes smaller, and the releasing operation of the latch link becomes unstable. Further, when the trip link is tripped, the release operation of the latch link becomes slow, and the opening speed of the movable contact becomes slow.

(2) Since the latch link and the movable contact are urged toward each other, it is troublesome to insert the movable body between them.

[Purpose of the invention]

An object of the present invention is to provide a circuit breaker that allows easy insertion of a movable body without reducing the opening speed of the movable contact, and that can apply initial contact pressure to the movable contact. It is to be.

[Disclosure of the invention]

The circuit breakers and disconnectors of the present invention include a rotatably supported handle, a link having one end connected to the handle and a movable shaft provided at the other end, and the movable shaft being guided by the operation of the handle. a latch link having one end connected to the movable shaft and a locking portion provided at the other end; a return biased trip link that enables the locking portion to lock in the returned state; an abnormal current detecting means for causing a disconnection operation; a movable contact which is biased to open and has a movable contact; a fixed contact facing the movable contact; and an intermediate portion of the movable contact and the latch link. and a movable body that presses the latch link so that the locking portion locks on the trip link by the opening force of the movable contact, wherein the one end of the latch link and the movable shaft are connected to each other. One end is fixed to the other end of the latch link, the intermediate part passes between the movable body and the latch link, and the other end is loosely fitted into the gap and elastically attached to the movable shaft. The invention is characterized in that it has a leaf spring in contact with the movable body for applying contact pressure, and an intermediate portion of the leaf spring is pressed by the movable body.

According to the configuration of the present invention, the leaf spring for applying contact pressure biases the latch link in the direction in which the locking part is locked to the trip link, so when the spring force of the leaf spring is increased, the locking part of the latch link is engaged. The stopping force also increases, so the release action of the latch link does not become unstable, and the spring force of the leaf spring does not affect the opening force of the movable contact when the trip link is tripped, so the release action of the latch link is slow. Therefore, the opening speed does not decrease. Furthermore, since the tip of the leaf spring is supported by the movable shaft, it is easy to insert the movable body between the leaf spring and the movable contact.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 4. That is, the circuit breaker here includes a handle 1 that is pivotably supported, a link 3 that is connected at one end to the handle 1 and has a movable shaft 2 at the other end, and a link 3 that connects the movable shaft 2 to the handle. 1, a latch link 6 having one end connected to the movable shaft 2 and a locking part 5 provided at the other end, and a return biasing link 6 which enables the locking part 5 to be locked in the returned state. trip link 7 and abnormal current detection means 8 for tripping the trip link 7.
, a movable contact 10 which is biased to open and has a movable contact 9, and a fixed contact 11 facing the movable contact 9.
and a movable body 12 which is interposed between the movable contact 10 and the intermediate portion of the latch link 6 and presses the latch link 6 by the opening force of the movable contact 10 so that the locking part 5 locks on the trip link 7. In the provided circuit breaker, the gap 13 formed between the one end of the latch link 6 and the movable shaft 2, and the intermediate portion between the movable body 12 and the latch link 6, with one end fixed to the other end of the latch link 6, It has a leaf spring 14 for applying contact pressure that passes between the two ends and whose other end is loosely fitted into the gap 13 and is in elastic contact with the movable shaft 2, and the intermediate part of the leaf spring 14 is pressed against the movable body 12. .

The hole 1b in the center of the handle 1 is connected to the frame 1.
It is passed through and supported by a fixed shaft 16 of No. 5. 17
is a return spring for the handle 1 in the off direction. The frame 15 is fixed to the table 19 with screws 18,
A portion of the handle 1 protrudes from a hole 22 in a cover 21 attached to the table 19 by a pin 20.

The link 3 is connected by passing a shaft 3a through a hole 3b at one end, and passing the shaft 3a through a hole 1c in the handle 1. The movable shaft 2 is passed through the hole 3d at the other end.

The slit 4 is formed in the frame 15.

As shown in FIG. 4, the latch link 6 has tongues 23 projecting from both sides of one end, and the movable shaft 2 passes through a hole 24 in the tongues 23. This tongue piece 23 creates a gap 13 between one end of the latch link 6 and the movable shaft 2.
is formed.

The trip link 7 is supported by a shaft 25 at the intermediate portion passing through a hole 26 in the frame 15, is urged to return by a return spring 27, and is locked to a stopper 28 of the frame 15 to return to the return state.

The abnormal current detection means 8 includes a bimetal 29 for detecting overcurrent and an electromagnet 30 for detecting short circuit current.
and are each supported by a frame 15. The tip 29a of the bimetal 29 faces the passive part 7a of the trip link 7, and the plunger 30a of the electromagnet 30 faces the passive part 7b of the trip link 7.

The movable contact 10 has an intermediate portion supported by a fixed shaft 31, a movable contact 9 provided at the tip, and an opening spring 32 compressed between the rear end and the electromagnet 30.

The fixed contact 11 is provided on a fixed contact 33 fixed to the device stand 19, and a load side terminal 34 is provided at the end of the fixed contact 33.

The movable body 12 is passed through a slit 35 formed in the frame 15, and both ends of the movable body 12 are brought into contact with intermediate parts of a pair of movable contacts 10 (two-pole configuration), and the central part is brought into contact with the leaf spring 14.

In addition, 36 is a power supply side terminal, and the electric path is power supply side terminal 36 → coil 30b of electromagnet 30 → flexible electric wire 37 → bimetal → flexible electric wire 38 → movable contact 19 → movable contact 9 → fixed contact 11 → fixed contact child 33 → load side terminal 34.

39 is an arc extinguishing device.

This circuit breaker is in the on state in FIGS. 1 and 2, and the imaginary line on the handle 1 in FIG. 1 is in the off state. In the on state, when the handle 1 rotates from the off to on position, the movable shaft 2 moves the slit 4 toward the movable contact 10, so the leaf spring 1
4 is pushed toward the latch link 6 by the movable body 12, the latch link 6 pushes the movable body 12 using the locking part 5 as a fulcrum, the movable contact 10 rotates against the opening spring 32, and the movable contact 9 opens. It contacts the fixed contact 11. At this time, since the leaf spring 14 is bent, contact pressure is applied from the initial stage of contact.

When an overcurrent flows in the electric circuit, the bimetal 29a operates, and when a short circuit current flows, the plunger of the electromagnet 30 operates. For this reason, trip link 7
When the locking part 5 is released from the trip link 7, the opening spring 32 causes the latch link 6 to rotate around the movable shaft 2 as shown in FIG. While being supported by the movable shaft 2, the movable contact 10 is opened.

The released latch link 6 is reset when the handle 1 is rotated to the off position, and the locking portion 5 is pushed down by the reset protrusion 1a of the handle 1 and is locked to the trip link 7 which has returned to its original position.

According to this embodiment, the leaf spring 1 for applying contact pressure
4 urges the latch link 6 in the direction of locking the locking portion 5 to the trip link 7, so the leaf spring 1
If the spring force of the latch link 6 is increased, the locking force of the locking portion 5 of the latch link 6 is increased.
The release operation of the latch link 6 does not become unstable, and the spring force of the leaf spring 14 does not affect the opening force of the movable contact 10 during the tripping operation of the trip link 7, so the release operation of the latch link 6 is not delayed and opens. Extreme speed does not decrease. Further, since the tip of the leaf spring 14 is supported by the movable shaft 2, it is easy to insert the movable body 12 between the leaf spring 14 and the movable contact 10.

〔Effect of the invention〕

According to the circuit breakers and disconnectors of the present invention, the leaf spring for applying contact pressure biases the latch link in the direction in which the locking part locks on the trip link, so when the spring force of the leaf spring is increased, the latch link The locking force of the locking part also increases, so the release operation of the latch link does not become unstable.Furthermore, the spring force of the leaf spring does not affect the opening force of the movable contact when the trip link is tripped, so the latch link's release operation does not become unstable. The release action does not slow down and the opening speed does not decrease. Furthermore, since the tip of the leaf spring is supported by the movable shaft, there is an effect that it is easy to insert the movable body between the leaf spring and the movable contact.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a mechanism in an on-state according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a movable contact in an on-state, FIG. 3 is a cross-sectional view of a tripped state, and FIG.
The figure is a partially exploded perspective view. DESCRIPTION OF SYMBOLS 1... Handle, 2... Movable axis, 3... Link, 4... Slit, 5... Locking part, 6... Latch link, 7... Trip link, 8... Abnormal current detection means, 9... Movable Contact, 10... Movable contact, 11... Fixed contact, 12... Movable body, 13...
...Gap, 14...Leaf spring.

Claims (1)

[Claims] 1. A rotatably supported handle, a link having one end connected to the handle and a movable shaft provided at the other end, a slit for guiding the movable shaft by operating the handle, and a link having one end connected to the movable shaft. a latch link that is connected to the latch link and has a locking portion at the other end; a trip link that is biased to return so that the locking portion can be locked in the restored state; and an abnormal current detecting means that trips the trip link. A movable contact which is biased to open and has a movable contact, a fixed contact opposite to the movable contact, and a movable contact interposed between the movable contact and the intermediate portion of the latch link, and which is operated by the opening force of the movable contact. A circuit or disconnector comprising a movable body that presses the latch link so that the locking part locks on the trip link,
a gap formed between the one end of the latch link and the movable shaft; one end of the latch link is fixed to the other end of the latch link, an intermediate portion passes between the movable body and the latch link, and the other end is in the gap; A circuit breaker comprising a leaf spring for applying contact pressure that is loosely fitted and in elastic contact with the movable shaft, and an intermediate portion of the leaf spring is pressed by the movable body.