Circuit breaker

Patent metadata

Field	Value
Publication number	US-9691559-B2
Application number	US-201414524672-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Nov 19, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A circuit breaker includes: fixed contact points; and a moving contact assembly. The moving contact assembly includes: a shaft; a moving contact that is held in the shaft; and springs that apply torque to the moving contact. The shaft includes: stopping faces that are formed in a direction opposite to the direction in which the moving contact rotates; and guiding faces that are curved from the stopping faces. The moving contact includes: first surfaces that are formed on the radius of rotation of the moving contact; and sliding surfaces that are located at an angle to the first surfaces and slanted toward the center of rotation with respect to the line of action of a tangential force of torque at the points of contact with the guiding faces.

First claim

What is claimed is:

1. A circuit breaker including a moving contact assembly that is brought into contact with or separated from fixed contact points, the moving contact assembly comprising:
a shaft that is rotatable in a first direction or a second direction opposite to the first direction by means of a switching mechanism;
a moving contact that is held to be rotatable in the first or second direction with respect to the shaft, with a rotation axis not fixed to the shaft; and
springs that apply torque to the moving contact in the first direction,
the shaft comprising:
stopping faces that are formed in a direction opposite to the first direction in which the moving contact rotates; and
guiding faces that are curved from the stopping faces and face the rotation axis of the shaft,
wherein the stopping faces are formed on a radius of rotation of the shaft, and
the guiding faces are shaped like an arc bulging toward the rotation axis of the shaft when viewed from a cross-section perpendicular to the rotation axis of the shaft,
the moving contact comprising:
first surfaces that are formed on the radius of rotation of the moving contact and brought into contact with the stopping face; and
sliding surfaces that are located at an angle to the first surfaces, face the rotation axis of the moving contact, and are slanted toward a center of rotation with respect toa line of action of a tangential force of torque at a points of contact with the guiding faces,
wherein a position of the moving contact is corrected depending on positional errors of the points of contact when the moving contact comes into contact with the fixed contact points, and
when the moving contact is separated from the fixed contact points, a component force of the torque directed toward the sliding surfaces causes the sliding surfaces to move with respect to the guiding faces against the frictional force and returns the moving contact to a normal position where the rotation axis of the moving contact coincides with the rotation axis of the shaft.

2. The circuit breaker of claim 1 , wherein the fixed contact points are arranged in a pair symmetrically with respect to the rotation axis of the shaft, and
the first surfaces and the sliding surfaces are arranged in pairs symmetrically with respect to the rotation axis of the moving contact.

3. The circuit breaker of claim 2 , wherein spring supports are rotatably mounted on parts of the shaft symmetrical with respect to the rotation axis of the shaft,
the springs are supported on the pair of spring supports so that the pair of spring supports rotate in the direction opposite to the first direction,
the moving contact comprises a pair of spring support contact surfaces that are curved from the sliding surfaces, convex in a direction away from the rotation axis of the moving contact, and pressed against the spring supports, and
the springs rotate the pair of spring supports in the direction opposite to the first direction, and the pair of spring supports presses the pair of spring support contact surfaces to rotate the moving contact in the first direction.

4. The circuit breaker of claim 2 , wherein the shaft is symmetrical with respect to the rotation axis of the shaft.

5. The circuit breaker of claim 2 , wherein the moving contact is symmetrical with respect to the rotation axis of the moving contact.

6. The circuit breaker of claim 1 , wherein the first direction is a direction in which the moving contact assembly is brought into contact with the fixed contact points, and
the shaft rotates further than the moving contact in the first direction while the moving contact is in contact with the fixed contact points, the torque of the springs therefore increases, and this increased torque helps increase the contact force between the moving contact and the fixed contact points.

Assignees

• Lsis Co Ltd

Inventors

• Oh Ki Hwan

Classifications

• H01H1/205 Primary

  Details concerning the elastic mounting of the rotating bridge in the rotor · CPC title

• H01H1/32

  Self-aligning contacts · CPC title

• H01H1/34

  with provision for adjusting position of contact relative to its co-operating contact · CPC title

• H01H1/18

  with subsequent sliding · CPC title

• H01H73/045

  Bridging contacts · CPC title