| 摘要 |
PROBLEM TO BE SOLVED: To provide a thumbtack having improved safety by covering a needle from the outside, and having high pressing effect to an article, even if a pushing degree into a board or a wall surface is low, without impairing designability of the article to be tacked on the board or the wall surface.SOLUTION: One form of a disclosed thumbtack is a thumbtack having a needle part, and a knob part used when pushing in or pulling out the needle part. The thumbtack includes: a spring part enclosing the needle part and arranged expandably and contractibly in each direction in which the needle part is pushed in or pulled out; and a spring storage part for storing inside the spring part contracted to the root direction of the needle part. The spring part has a trumpet shape expanded to the tip direction of the needle part, and has a spiral structure in which each contracted shell is out of contact, and a diameter of the tip of the spring part is smaller than a diameter of the spring storage part. |
