Clamp for formwork system

Claim 1

A clamp for use in erecting formwork for pouring a slab in place on steel joists, each joist being in the form of a truss having a web, a top chord and a bottom chord, the web being formed of metal bar stock and comprising inclined tension and compression members triangulating the space between the top and bottom chords, the top chord comprising a pair of metal bars having their vertical legs welded to opposite sides of the web, said clamp being adapted for the removable mounting of form supports extending transversely of the joists through the webs of the joists underneath the top chords of the joists, said form supports having openings for the clamp, said clamp having means at one end thereof for hooking onto an inclined web member of a joists and means at its other end for pushing the form support up another inclined web member of the joist, and comprising a screw having said hooking means at one end thereof, a member engageable with the form support for pushing it up said other inclined web member having a part engageable in one of said openings in the form support and a hole receiving the screw spaced from said part a distance for positioning the screw to extend underneath the form support, and a nut threaded on the screw engageable with the outside of said member.