Patent ID: 8528374

Claim:
A portable device for electronically locking and unlocking a lock through wireless communication, the portable device comprising: a mechanical key for mechanically locking and unlocking the lock, the mechanical key including an opening, a cover defining an internal space in communication with the opening, and a fitting portion formed on the cover; an engagement member arranged in the internal space of the mechanical key, the engagement member being movable between a first position at which part of the engagement member projects from the opening and a second position at which the engagement member is substantially accommodated in the mechanical key; a coil spring that serves as a resilient member, the coil spring being arranged in the internal space of the mechanical key for urging the engagement member toward the first position from the second position; and a case including a key accommodation portion for removably accommodating the mechanical key so that the mechanical key is capable of being separated from the key accommodation portion, the key accommodation portion including an engaged portion engaged with the engagement member that projects from the opening at the first position when the mechanical key is accommodated in the key accommodation portion; wherein the coil spring includes: a first winding portion; and a second winding portion, formed with the first winding portion, which serves as a fixing portion fixed to the fitting portion of the mechanical key, wherein the second winding portion and the first winding portion are coplanar; and the first winding portion and the second winding portion are both supported by an inner surface of the cover on which the fitting portion is formed, the cover being moveable together with the mechanical key when the mechanical key is removed from the case.