Scaffold lumber clamps

A scaffold lumber clamp assembly including an elongated angle member comprising first and second right angularly disposed elongated flanges integrally joined together along adjacent longitudinal edge portions and including inner and outer included and excluded angle sides, respectively, the opposite ends of one of said flanges including a pair of outstanding threaded studs anchored relative thereto and projecting outwardly from the outer side thereof, a first elongated clamp bar paralleling the outer side of said one flange and including opposite end openings formed therein through which said studs are slidingly received, and a pair of first threaded abutment members threadedly engaged on said studs outwardly of the side of said clamp bar remote from said one flange and abuttingly engageable with said clamp bar about said openings, one end of said one flange including a threaded shank anchored relative thereto and projecting endwise outwardly from the corresponding end portion of the longitudinal edge of the one flange remote from the other flange, the end of the other flange remote from said one end of said one flange having one end portion of a threaded bolt pivotally anchored thereto adjacent the free longitudinal edge of said other flange remote from said one flange for swinging of said bolt about an axis generally paralleling the free longitudinal edge and extending transversely of said bolt between a free position generally paralleling said one flange and a second position projecting endwise outwardly of said free longitudinal edge of said other flange and generally paralleling the latter, and second and third inner and outer elongated clamp bars paralleling said second flange and including corresponding first and second ends, said first ends having registered openings formed therein through which the outer free end portion of said threaded shank is slidingly received, a second threaded abutment member threadedly engaged on the outer end of said shank outwardly of said outer clamp bar and abuttingly engageable with the outer side of said outer bar, said second ends of said second and third bars including registered notches formed therein opening laterally outwardly through the longitudinal side edges of said second and third bars corresponding to said free longitudinal edge of said other flange and into which the free end portion of said threaded bolt is receivable when said bolt is swung from said second position to said first portion, and a third threaded abutment member threadedly engaged on the free end portion of said bolt and abuttingly engageable with the side of said outer clamp bar remote from said inner clamp bar.