Mine roof truss and components

A mine roof support plate for a mine truss and including, in combination, a plate having an upper bearing surface for engaging an exposed mine roof surface, and mutually spaced horn portions depending from and part of said plate, each of said horn portions being provided with a lower, vertically raised, J-shaped lip means forming an upwardly facing stirrup-support cradle for preserving truss integrity and supporting an external stirrup in hanging position in said cradle in non-tensioned condition, said plate being provided with a transverse securement aperture, and each of said horn portions having a reaction surface essentially facing each other, elevated with respect to said cradle, and cooperable with said external stirrup.

In combination, plural mine truss stirrups each having a hairpin shaped elongate element provided a curved head portion and having opposite ends and a cylinder integral with and disposed between said opposite ends and provided with a central aperture admitting an external elongate truss element to be placed in tension;

• and a mine roof support plate for a mine truss and including a plate having an upper bearing surface for engaging an exposed mine roof surface, and mutually spaced horn portions depending from and forming part of said plate, each of said horn portions being provided with a lower, vertically raised, J-shaped lip means forming an upwardly facing stirrup-support cradle for preserving truss integrity and supporting a respective one of said stirrups in hanging position when in said cradle in non-tensioned condition, said plate being provided with a transverse securement aperture, and each of said horn portions having an inwardly oriented, transversely curved reaction surface elevated with respect to said cradle and engaged by respective ones of said external stirrups.

A mine roof support truss including, in combination, end brackets provided with angulated attachment apertures, roof bolts passing through said apertures for securing said end brackets in place, trussing structure secured to and between said end brackets, said trussing structure including an intermediate plate provided an attachment aperture, a roof bolt passing through said attachment aperture, said plate being provided with depending horn portions having respective, inwardly facing reaction surfaces and lower, mutually inwardly oriented, raised J-shaped lips, said trussing structure also including elongated, hairpin shaped stirrups coupled to said end brackets and retentively engaged by said horn portions, respectively, at their reaction surfaces.