Portable timepiece and method of fabricating crown provided to the timepiece

A portable timepiece, comprising:

• a case band including a timepiece movement;
• a pipe attached to the case band and having a male screw portion disposed on an outer side of the case band;
• and a crown connected to a hand setting stem for transmitting a rotational force to the timepiece movement, the crown being movable into and out of mesh with the male screw portion, and the crown being held so as not to be rotated by bringing the crown in mesh with the male screw portion, the crown comprising:
• a crown shaft including a rotational force receiving portion that has a first engaging portion at an outer periphery thereof, a diameter larger than a diameter of the male screw portion, and is arranged outside of the pipe and cooperatively moving the hand setting stem in a state in which the crown and the male screw portion are not in mesh with each other;
• a crown head having a head main body that has an open end and a closed end, an inner periphery of the head main body including a rotational force transmitting portion, a ring mounting face in a circular shape, and an inner peripheral face in a circular shape, the rotational force transmitting portion having a second engaging portion engageable with and disengageable from the first engaging portion of the rotational force receiving portion, the ring mounting face being formed on one end side from the rotational force transmitting portion and having a diameter equal to or larger than a maximum diameter of the rotational force transmitting portion, and the inner peripheral face being formed on the other end side from the rotational force transmitting portion and having a diameter equal to or larger than the maximum diameter of the rotational force transmitting portion and making sliding contact with the first engaging portion;
• a screw ring including a female screw portion movable into and out of mesh with the male screw portion and having a diameter smaller than a diameter of the rotational force receiving portion and being mounted to the ring mounting face;
• and
• an elastic member compressed between the crown head and the crown shaft for urging the crown head in a direction of being separated from the case band.

A portable timepiece comprising:

• a case band;
• a timepiece movement disposed in the case band and having a hand setting stem;
• a pipe extending through and attached to the case band, the pipe having a male screw portion on a part of the pipe that extends outside the case band;
• and a crown having a crown head and a crown shaft, the crown head having a female screw portion threadedly engaged with the male screw portion and being disengageable therefrom in response to rotation of the crown head in a loosening direction accompanied by axial movement of the crown head in a direction away from the case band, and the crown shaft having one end portion extending into the pipe and connected to the hand setting stem and another end portion extending outside the case band beyond the pipe and slidably contacting an inner peripheral surface of the crown head to support the crown head and guide the axial movement thereof.