Patent ID: 9055364
Filing Date: 2015-06-09
Classification: H02G,H04M,H04R

Abstract:
1. An earset having an automatic rewinding unit of a ball/wire spring type, comprising: a main body curved in a “C” shape and wound around the neck; and automatic rewinding units respectively installed at both sides of the main body, each automatic rewinding unit being configured so that when a wire connected to a receiver is pulled by a desired length and released, the wire is drawn as much as the desired length, and when the drawn wire is pulled and then released, the wire is rewound into the main body, wherein each of the automatic rewinding units includes: a base plate; a fixed shaft extending from one side of the base plate in a direction perpendicular to the base plate; a wheel fitted around the fixed shaft to rotate about the fixed shaft; a wire wound around a circumferential surface of the wheel with one end of the wire fixed to the circumferential surface of the wheel; an elastic member rolled into a roll shape with one end of elastic member fixed to the fixed shaft and the other end thereof fixed to a portion of the wheel; a cap integrally coupled to the wheel to rotate together with the wheel, the cap having a track concavely formed in one side thereof which faces a case; and a case configured to cover the cap, wherein the track includes: an outer track concavely formed in a circumferential direction of the cap; an inner track formed at an inner side of the outer track to be concave in the circumferential direction of the cap; at least two connection tracks concavely formed to connect the outer track and the inner track; and a stop track concavely formed between the outer track and the inner track, wherein a locking member is mounted to the track so that when the wire is pulled, the locking member moves via the inner track and the connection track to the outer track and then moves along the outer track, when the pulled wire is released, the locking member moves to the stop track for the wheel not to rotate, and when the wire is pulled and released again, the locking member moves from the stop track to the inner track so that the wheel rotates in a reverse direction by an elastic restoring force of the elastic member and thus the wire is rewound around the circumferential surface of the wheel, wherein when the receiver is pulled out of the main body, the wire fixed to the receiver is drawn out of the main body so that the locking member located at the inner track moves through the connection track to the outer track, the wheel and the cap fitted around the fixed shaft are axially rotated and the elastic member is shrunken, when the shrunken and drawn receiver is released, the wheel rotates in the reverse direction by the restoring force of the elastic member so that the locking member is inserted into the stop track to stop and simultaneously the wire keeps a drawn state, and when the wire is pulled and released again, the locking member inserted in the stop track moves to the inner track, and the wheel and the cap are rotated in the reverse direction by the elastic restoring force of the elastic member so that the unwound wire is rewound.