Mounting device for depending structural members from deck plate or the like

Claim 1

A mounting device for depending structural members from deck plate or the like, the deck plate adapted to have concrete poured onto the upper surface thereof to anchor the device to said deck plate, which comprises: A. a bolt having projecting means thereon, B. a spring fitted to said bolt below said projection means and having the upper end stopped by said projection means, C. a generally cylindrical member engaged with the lower end of the bolt, D. resilient expandable means associated with said cylindrical member and located at least at the upper end of the cylindrical member, E. said cylindrical member and expandable means adapted to be pushed axially through a hole in the said deck plate from the upper surface thereof by pressing down on the upper end of the bolt and therebY bringing the edge of the hole into constricting engagement with said expandable means to enable passage of said expandable means and cylindrical member, but said expandable means adapted to expand after passing the hole to the bottom surface of said deck plate, F. said spring adapted to be compressed between said projection means and said upper surface while said bolt is being pressed downward and serving upon release of said bolt to bias the bolt to move upward, G. said expandable means having structure adapted to engage the lower surface of said deck plate to maintain the bolt erect on account of the action of said spring while resisting withdrawal of said bolt through said hole from above said deck plate, H. means on said cylindrical member for coupling of a depending structural member to the bottom end of said bolt.