Air circuit breaker

Patent metadata

Field	Value
Publication number	US-12424399-B2
Application number	US-202218284773-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Mar 29, 2021
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

An air circuit breaker is disclosed. An air circuit breaker according to one aspect of the present disclosure includes a cradle and a circuit breaker main body drawn-in and drawn-out to/from the cradle; and further includes: an interlock lever connected to an off button of the circuit breaker main body to move vertically; and a transfer device unit provided on the lower side of the cradle, wherein the transfer device unit can include a key interlock assembly, which is provided to be horizontally movable so that, in a state of having moved toward one side thereof, the movement of the interlock lever is restricted and, in a state of having moved toward the other side thereof, the movement of the interlock lever is permitted.

First claim

What is claimed is:

1. An air circuit breaker, comprising:
a cradle and a circuit breaker main body drawn in and drawn out to/from the cradle;
an interlock lever connected to an off button of the circuit breaker main body to move vertically; and
a transfer device unit provided on a lower side of the cradle,
wherein the transfer device unit has a key interlock assembly, which is provided to be horizontally movable so that, in a state of having moved toward a first side thereof, the movement of the interlock lever is restricted and, in a state of having moved toward a second side thereof, the movement of the interlock lever is permitted.

2. The air circuit breaker of claim 1 , wherein a shutter plate installed to be horizontally movable and restricted or allowed to move according to a position of the interlock lever is provided in the transfer device unit, and
wherein the key interlock assembly restricts movement of the shutter plate in a state in which the key interlock assembly is moved in a first direction and allows movement of the shutter plate in a state in which the key interlock assembly is moved in a second direction.

3. The air circuit breaker of claim 1 , wherein the key interlock assembly comprises:
a housing plate coupled to the transfer device unit;
an interlock plate installed to be horizontally movable on the housing plate; and
a key assembly that moves the interlock plate.

4. The air circuit breaker of claim 3 , wherein a key hole in which the key assembly is installed is formed on a front surface of the housing plate.

5. The air circuit breaker of claim 3 , wherein a through hole is formed on two side surfaces of the housing plate, respectively, to allow the interlock plate to slide.

6. The air circuit breaker of claim 3 , wherein a spring insertion part into which a plate return spring can be installed is provided on the interlock plate.

7. The air circuit breaker of claim 3 , further comprising a second key assembly provided in a pair of key assemblies with the key assembly, and at least one key assembly of the pair of key assemblies is positioned at a specific position to fix the interlock plate in a locked position.

8. The air circuit breaker of claim 3 , wherein a contact part subjected to force of the key assembly is formed to protrude from the interlock plate.

9. The air circuit breaker of claim 8 , wherein a restraining part for limiting or allowing movement of the interlock lever is bent and formed on the interlock plate.

10. The air circuit breaker of claim 9 , wherein the restraining part is disposed at a height between intervals where the interlock lever moves upward and downward.

11. The air circuit breaker of claim 8 , wherein the key assembly comprises a rotating cylinder rotated by a key, and a key lever rotating with the rotating cylinder is provided at a rear portion of the key assembly.

12. The air circuit breaker of claim 11 , wherein a pressing part for applying force to the contact part is bent and formed on the key lever.

13. An air circuit breaker, comprising:
a cradle with one side surface open;
a circuit breaker main body configured to be drawn in and drawn out to/from the one side surface of the cradle;
an interlock lever connected to a button of the circuit breaker main body and configured to be located at a first position in a state in which the button is pressed, and located at a second position in a state in which the button is not pressed;
a transfer device unit provided in the cradle to draw in and draw out the circuit breaker main body; and
an interlock plate movably installed in a front of the transfer device unit to fix the interlock lever to the first position when the interlock plate is in a locked position, and to allow the interlock lever to be moved from the first position to the second position when the interlock plate is in an unlocked position.

14. The air circuit breaker of claim 13 , further comprising:
a cover plate covering an outer surface of the transfer device unit and having a hole formed thereon; and
a shutter plate positioned between the transfer device unit and the cover plate and opening and closing the cover plate hole,
wherein the interlock plate positions and fixes the shutter plate to a position where the cover plate hole is closed in a state where the interlock plate is moved to the locked position, and allows movement of the shutter plate to open and close the cover plate hole of the shutter plate in a state where the interlock plate is moved to the unlocked position.

15. The air circuit breaker of claim 14 , wherein the cover plate has a first guide protrusion respectively formed on both sides of the interlock plate along a motion direction of the interlock plate.

16. The air circuit breaker of claim 14 ,
wherein a second guide protrusion protruding toward the interlock plate is formed on the cover plate, and
wherein a guide groove extending along a motion direction of the interlock plate and into which the second guide protrusion is inserted is formed on the interlock plate.

17. The air circuit breaker of claim 14 , comprising an operating means for moving the interlock plate.

18. The air circuit breaker of claim 17 , wherein an accommodating groove for accommodating the operating means is formed on an outer surface of the cover plate, and the interlock plate is disposed on an inner surface of the cover plate.

19. The air circuit breaker of claim 18 , wherein the operating means is a key assembly.

20. The air circuit breaker of claim 19 , wherein a key assembly hole through which the key assembly can pass is formed on a bottom surface of the accommodating groove.

Assignees

• Ls Electric Co Ltd

Inventors

• Lee Kyu Ho
• Park Yong Ik

Classifications

• H01H31/06 Primary

  for interlocking between casing, cover, or protective shutter and mechanism for operating contacts · CPC title

• H01H9/24

  for interlocking two or more parts of the mechanism for operating contacts · CPC title

• H01H31/08 Primary

  for interlocking two or more parts of the mechanism for operating contacts · CPC title