Patent ID: 9239073
Filing Date: 2016-01-19
CPC Classification: E04B,F16B

Claim Text:
1. A fastening device comprising: a bolt in which a right screw is formed on one end portion and a left screw is formed on another end portion; a jig engaging section that is formed on one end portion or both end portions of the bolt such as to be capable of being rotated using a jig; and a right screw nut and a left screw nut that respectively screw onto the right screw in the one end portion of the bolt and the left screw in the other end portion; and wherein a head section having a greater diameter than a screw thread is formed on either of the one end portion and the other end portion, or both end portions of the bolt, the head section being capable of protecting the screw thread even when struck with a hammer and in which a nut having a smaller diameter than the screw thread or an easily positioned nut is capable of being inserted.