Portable device including mechanical key

A mechanical key for arrangement in a case of a portable device for electronically locking and unlocking a lock through wireless communication in which the mechanical key is for mechanically locking and unlocking the lock, wherein the case includes 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 mechanical key comprising:

• a main body 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 main body;
• and
• 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;
• the key accommodation portion including an engaged portion engageable with the engagement member that projects from the opening at the first position when the mechanical key is accommodated in the key accommodation portion;
• and
• 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 main body, 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.

A method for assembling a mechanical key for arrangement in a case of a portable device for electronically locking and unlocking a lock through wireless communication in which the mechanical ey is for mechanically locking and unlocking the lock, wherein the case includes 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 method comprising:

• arranging an engagement member, which is engageable with an engaged portion formed in the key accommodation portion, in an internal space formed in a main body of the mechanical key, in which the internal space is in communication with an opening formed in the mechanical key, and the engagement member is movable between a first position at which part of the engagement member projects from the opening and engages with the engaged portion and a second position at which the engagement member is substantially accommodated in the mechanical key;
• fixing a fixing portion arranged on a coil spring, which urges the engagement member from the second position toward the first position, to a fitting portion formed on a cover defining the internal space, wherein the coil spring includes a first winding portion and a second winding portion formed with the first winding portion and functioning as the fixing portion, 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;
• and
• attaching the cover, to which the coil spring is fixed, to the main body of the mechanical key with the coil spring held between the cover and the engagement member.