| 摘要 |
<p>An automatic spanner able to engage or disengage a bolt or a nut is disclosed, which includes a body, a head disposed at one side of the body and having a first jaw, a second jaw, a first connection side and a second connection side, a protrusion member which is inserted into the second connection side of the head, and an elastic member which is installed between the second connection side of the head and the protrusion member for providing an elastic force to the protrusion member, whereby the bolt and nut held by the head rotate when the body and head rotate in one direction, and don't rotate when the body and head rotate in the other direction owing to the second jaw and the protrusion member.</p> |
