Nailable metal joist

Claim 1

THE COMBINATION OF A NAILABLE METAL JOIST COMPRISING AN ELONGATED WEB MEANS, A CHORD JOINED TO SAID WEB MEANS ALONG ONE EDGE THEREOF, SAID CHORD HAVING A LONGITUDINALLY EXTENDING OUTER EXTREMITY, AN ELONGATED, HOLLOW NAILING MEMBER SUBSTANTIALLY U-SHAPED IN CONFIGURATION SECURED TO SAID OUTER EXTREMITY, SAID U-SHAPED MEMBER HAVING SPACED APART, PARALLEL WALLS OF NAIL PENETRABLE SHEET METAL EXTENDING SUBSTANTIALLY NORMAL TO SAID WEB MEANS, A COLLATERAL STRUCTURE MEMBER DISPOSED ADJACENT TO AND SUPPORTED BY SAID CHORD, AND DRIVEN FRICTIONAL FASTENING ELEMENTS PASSING THROUGH SAID COLLATERAL MEMBER AND ALSO SUCCESSIVELY THROUGH SAID SPACED APART WALLS OF SAID NAILING MEMBER, THUS PASSING ENTIRELY THROUGH SAID HOLLOW NAILING MEMBER OF SAID CHORD, SAID DRIVEN FASTENING ELEMENTS BEING RETAINED SECURELY IN PLACE BY THEIR FRICTIONAL CONTACT WITH THE DISTORTED MARGINS OF THE OPENINGS FORMED IN THE SPACED APART WALLS OF THE NAILING MEMBER BY THE DRIVING OF SAID FASTENING ELEMENTS COMBINED WITH THE LOCKING EFFECT OF THE SLIGHT DEFLECTION OF SAID LAST ONE OF SAID PARALLEL WALLS, DUE TO THE INHERENT SLIGHT UNHINDERED RESILIENCE THEREOF UNDER THE DRIVING FORCE OF THE FASTENING ELEMENT.