| 摘要 |
The present invention relates to a spanner having an improved function to tighten and, more specifically, to a spanner having an improved function to tighten, which does not separate a spanner from a bolt or a nut in the process of tightening and is able to rotate continuously in the direction of tightening to improve the function to tighten. The spanner (10) comprises: a head unit (11) with which a fixing means is combined; a handle (13); and a neck unit (12) to connect the head unit (11) and the handle (13). The head unit (11) comprises: a first tightening surface and a second tightening surface (161, 163) to come in contact with the circumferential surface of the fixing means; a penetrating hole (15) extended from the first tightening surface (161) outward; a slider (111) placed on the penetrating hole (15) to be movable along the first tightening surface (161); an elastic means (112) combined with one end of the slider (111) to support by elasticity; and a fixing part (113) to fixate the other end of the elastic means (112). The first tightening surface (161) comprises: a first extended part extended to have a first curvature radius, and a second extended part extended to have a second curvature radius. The penetrating hole (15) is formed in the extension direction of the first extended part on the first tightening surface (161). |
