Patent ID: 9484167
Filing Date: 2016-11-01
CPC Classification: H01H

Claim Text:
1. A coupling device for a circuit breaker, the coupling device comprising: an outer handle assembly coupled to a shaft and installed at a distribution board; a circuit breaker body; an inner handle rotatably installed at the circuit breaker body and configured to manipulate the circuit breaker; and a coupling assembly configured to transmit a rotational force of the outer handle assembly to the inner handle, wherein the coupling assembly includes: a first coupler coupled to the outer handle assembly, the first coupler comprising one or more first coupling protrusions protruding away from the outer handle assembly along a first shaft-wise direction; a second coupler coupled to the inner handle, the second coupler comprising one or more second coupling protrusions protruding away from the inner handle in a second shaft-wise direction, wherein the second coupling protrusions interlockingly correspond to the first coupling protrusions and are longitudinally restricted by the first coupler along the second shaft-wise direction; a third coupler positioned between the first coupler and the second coupler and configured to transmit a rotational force from the first coupler to the second coupler; and a coupling spring configured as a compression coil spring provided between the first coupler and the second coupler, wherein the third coupler comprises: a body portion formed in a ring shape such that the coupling spring is inserted into the body portion, wherein the body portion is provided at an inner side of an inner circumferential surface of the first coupling protrusions and the second coupling protrusions; and a plurality of sliding protrusions radially protruding from an outer circumferential surface of the body portion, each sliding protrusion disposed between a side surface of a corresponding one of the first coupling protrusions and a side surface of a corresponding one of the second coupling protrusions to transmit the rotational force in a circumferential direction, wherein a first side surface and a second side surface of each of the sliding protrusions are formed as curved surfaces and configured to contact the corresponding side surfaces of the first coupling protrusions and the second coupling protrusions in a circumferential direction.