To provide a nut with a simple structure that enables quick tightening.
A knob main body 10 is formed by integrating a center annular rib R1 forming a center hole 11, an intermediate annular rib R2 forming a cut-in 13 fitted with a hook piece 12 and an outer peripheral annular rib R3, and has a chrysanthemum-like shape so as to be easily gripped and rotated. A single-hand-holding-type oscillating arm 15 is provided so as to extend from one side (lower side) of the center hole 11 of the knob main body 10 to the other side (upper side) along the inner face of the center hole 11, leaving a clearance 14. A partial female screw 16 is integrally provided for the oscillating end of the oscillating arm 15. A rib R4 fitted inside the intermediate rib R2 is formed around the single-hand-holding-type oscillating arm 15, and the oscillating arm 15 is integrated into a support body 17 having a hook piece 12 at a necessary point. The annular rib R4 of the support body 17 is fitted inside the intermediate rib R2, and the hook piece 12 is engaged with the notch 13 and positioned inside the center hole 11.
Higashio Masahiro
Torii Kazuhisa