| 摘要 |
PROBLEM TO BE SOLVED: To provide a retractable writing utensil free from battery exhaustion because of no necessity of a battery, and capable of increasing unpredictability because of mechanical power generation corresponding to a depressing operation of a knock part by a user.SOLUTION: A retractable writing utensil 1 includes a knock part 20 having a knock body 21 disposed to be movable along a longitudinal direction of a barrel cylinder 10 on an outer peripheral surface of the barrel cylinder 10, and a refill feeding mechanism 30 making a writing utensil tip part 33a of a writing body 33 protrude from one end 10a by depressing the knock part 21 toward the one end part 10a in the longitudinal direction of the barrel cylinder 10, and includes a conversion mechanism 40 converting a depressive motion of the knock body 21 into a rotary motion, and a power generation part 50 having a rotor rotated by the conversion mechanism 40 and performing power generation by rotation of the rotor. |
